Title of Invention	ROLLING METHOD FOR A ROLLED PRODUCT FOR INTRODUCING A STEP INTO THE ROLLED PRODUCT
Abstract	A rolled product (1) has a rolled product start (2) and a rolled product end (3). The rolled product (1) is rolled to a first desired dimension (dl) in a rolling gap (9) of a rolling stand (5), starting with the rolled product start (2). It is determined in an ongoing manner by a control computer (6) while the rolled product (1) is being rolled in the rolling stand (5) which point (10) of the rolled product (1) is currently in the rolling gap (9). Rolling of the rolled product (1) to the first desired dimension (dl) is terminated, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a previously determined first change point (4) of the rolled product (1), which is located between the rolled product start (2) and the rolled product end (3), so that a first step (12) is introduced into the rolled product (1) at the first change point (4).

Title of Invention

ROLLING METHOD FOR A ROLLED PRODUCT FOR INTRODUCING A STEP INTO THE ROLLED PRODUCT

Abstract

A rolled product (1) has a rolled product start (2) and a rolled product end (3). The rolled product (1) is rolled to a first desired dimension (dl*) in a rolling gap (9) of a rolling stand (5), starting with the rolled product start (2). It is determined in an ongoing manner by a control computer (6) while the rolled product (1) is being rolled in the rolling stand (5) which point (10) of the rolled product (1) is currently in the rolling gap (9). Rolling of the rolled product (1) to the first desired dimension (dl*) is terminated, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a previously determined first change point (4) of the rolled product (1), which is located between the rolled product start (2) and the rolled product end (3), so that a first step (12) is introduced into the rolled product (1) at the first change point (4).

Full Text	Description Rolling method for a rolled product for introducing a step into the rolled product The present invention relates to a rolling method for a rolled product, in particular a strip-type rolled product, which has a rolled product start and a rolled product end, the rolled product being rolled to a first desired dimension in a rolling gap of a rolling stand, starting with the start of the rolled product. The present invention also relates to a data medium with a computer program stored on the data medium for implementing such a rolling method, when the computer program is executed by a control computer for a rolling stand. The present invention also relates to a control computer for a rolling stand, which is configured - in particular programmed - in such a manner that the rolling stand can be activated by it according to such a rolling method. Finally the present invention relates to a rolled product, in particular a strip- type rolled product. Rolling methods, data media, control computers and rolled products of the type mentioned in the introduction are generally known. In particular with the rolling methods of the type mentioned in the introduction the entire rolled product is rolled to the first desired dimension, in other words from the rolled product start to the rolled product end. In some instances it would be expedient and useful to roll the rolled product to different desired dimensions, with the rolled product to be kept as a unit that is continuous per se. A solution to this problem is not known in the prior art to the knowledge of the applicant. It is known that the entire rolled product can first be rolled to a first desired dimension and the rolled product can then be divided, with one of the segments of the rolled product thus resulting being rolled to a second desired dimension. In this instance however the two segments of the rolled product are no longer continuous in respect of one another. The procedure described just above also has further disadvantages. In particular the process of dividing the rolled product into two segments is often time-consuming. This results in temperature losses, which in turn have a negative influence on subsequent rolling processes. The time; required to separate the individual segments means that this procedure can only be used to produce a rolled product, which has maximum two desired dimensions, and this only in segments that are separated from one another. The object of the present invention is to create a rolling method, a data medium and a control computer for a rolling stand, which can be used to produce a rolled product, which is configured as continuous per se and has at least two segments in the longitudinal direction, said segments having different dimensions from one another. The object is achieved for the rolling method in that while the rolled product is being rolled in the rolling stand, a control computer determines in an ongoing manner which point of the rolled product is currently in the rolling gap and rolling of the rolled product to the first desired dimension is terminated, when the point of the rolled product currently in the rolling gap corresponds to a previously determined first change point of the rolled product, which is located between the start of the rolled product and the end of the rolled product, so that a first step is introduced into the rolled product at the first change point. In a corresponding manner the object for the data medium is achieved in that it stores a computer program, which serves to implement such a rolling method, when the computer program is executed by a control computer for a rolling stand. Finally the object is achieved by a control computer for a rolling stand, which is configured, in particular programmed, in such a manner that the rolling stand can be activated by it according to such a rolling method. This basic form of the present invention can be realized regardless of the manner in which the rolling gap is set. In modern rolling stands the rolling gap is generally set by way of hydraulic cylinder units. Compared with other control elements such hydraulic cylinder units have the advantage that they can be adjusted not only in the load-free state but also under load. In particular if the rolling stand has such control elements that can be adjusted under load, it is possible for the rolled product to be rolled to a second desired dimension in the direction of the end of the rolled product after reaching the first change point. In this instance the second desired dimension can be smaller than the first desired dimension. Generally it will be greater than the first desired dimension. To complete the picture, it should be pointed out that to set the rolling gap under load the rolling speed generally has to be different from zero. The first step is therefore generally somewhat rounded. Alternatively it is also possible for the rollers of the rolling stand to be supported in roller bearings and the contact time at zero rolling speed to be kept so short that damage to the rollers - in particular burn damage - can be avoided. It is possible for the rolled product to be rolled to the second desired dimension from the first change point to the end of the rolled product. It is also possible for rolling of the rolled product to the second desired dimension to be terminated when the point of the rolled product currently in the rolling gap corresponds to a previously determined second change point, which is located between the first change point and the end of the rolled product, so that a second step is introduced into the rolled product at the second change point. As an alternative to rolling to the end of the rolled product, the rolled product can also be rolled to a second desired dimension in the direction of the start of the rolled product after reaching the first change point. Rolling to the second desired dimension can take place at the first change point or only from a point closer to the start of the rolled product. It is possible for rolling of the rolled product to the second desired dimension to be terminated, when the point of the rolled product currently in the rolling gap corresponds to a previously determined second change point, which is located between the start of the rolled product and the first change point, so that a second step is introduced into the rolled product at the second change point. The rolled product is generally rolled to the second desired dimension to the start of the rolled product. As an alternative to continuing rolling, it is also possible for the rolling stand to be raised, when the point of the rolled product currently in the rolling gap corresponds to the first change point, so that the rolled product passes through the rolling gap without being worked after the rolling stand has been raised. This procedure can then also be carried out, when the control elements for adjusting the rolling gap can only be adjusted in the load-free state. The rolled product can pass through the - then raised - rolling stand without being worked either forward (in other words in the previous rolling direction) or backward. When the rolled product passes through backward without being worked or has been rolled to the second desired dimension from the first change point to the start of the rolled product, it is possible for the rolled product, after rolling to the first and/or second desired dimension, starting with the start of the rolled product, to be rolled to a third desired dimension in the rolling gap of the rolling stand, until the point of the rolled product currently in the rolling gap corresponds to a second change point. The second change point can be located between the start of the rolled product and the first change point, so that a second step is introduced into the rolled product at the second change point. The second change point can also correspond to the first change point, so that the first step is increased. In contrast, when the rolled product has passed in its entirety through the rolling stand, it is possible for the rolled product then to be rolled to a second desired dimension, starting with the end of the rolled product, until the point currently in the rolling gap corresponds to a second change point, which is located between the first change point and the end of the rolled product, so that a second step is introduced into the rolled product at the second change point. Rolling to the second dimension is of course also terminated at the second change point in this instance. Further advantages and details will emerge from the description which follows of exemplary embodiments in conjunction with the basic outlines in the drawings, in which: Figure 1 shows the basic structure of a rolling arrangement, Figure 2 shows a flow diagram, Figures 3 to 14 show different states during the rolling of a rolled product and Figure 15 shows a rolled product after rolling. According to Figure 1 a rolled product 1 is to be rolled. The rolled product 1 here is preferably a strip-type rolled product 1. However a rod-type rolled product or a tubular rolled product could also be rolled. The rolled product 1 has a rolled product start 2 and a rolled product end 3. Also at least one change point 4 - also referred to below as the first change point 4 - is predefined. The change point 4 is preferably not defined by its distance from the rolled product start 2 or the rolled product end 3, since this distance changes as the rolled product 1 is rolled. Rather the change point 4 is preferably determined by the quantity of material of the rolled product 1 between the change point 4 and the rolled product start 2 or the rolled product end 3. The rolled product 1 is rolled in a rolling stand 5. For its part the rolling stand 5 is controlled by a control computer 6. A computer program 7 is supplied to the control computer 6. The computer program 7 can be supplied for example by means of a portable or otherwise data medium 8, on which the computer program 7 is- stored in (exclusively) machine-readable form. Supplying the computer program 7 programs (or more generally configures) the control computer 6 in such a manner that it executes a rolling method, which is described below in conjunction with Figures 2 to 14. According to Figure 2 in a step S1 the control computer 6 activates the rolling stand 5 in such a manner that the rolled product 1 is rolled to a first desired dimension dl* (in the case of a strip-type rolled product 1 therefore to a first desired thickness dl) from the rolled product start 2. Determination of the necessary control parameters for the rolling stand 5 by means of a pass schedule and the stand parameters of the rolling stand 5 is generally know to those skilled in the art. The actual rolling process, in other words the working of the rolled product 1, takes place in a rolling gap 9 of the rolling stand 5. In a step S2 the control computer 6 determines which point 10 of the rolled product 1 is currently in the rolling gap 9. The point 10 can be determined for example by way of a generally known material monitoring system 11. In a step S3 the control computer 6 compares the point 10 determined in step S2 with the first change point 4. If the first change point 4 has not yet been reached - see for example Figure 3 - the control computer 6 returns to step S2. This return to step S2 on the one hand causes the rolling process, which was started in step S1, to be continued. On the other hand step S2 is executed again, so that as a result the control computer 6 determines in an ongoing manner while the rolled product 1 is being rolled in the rolling stand 5 which point of the rolled product. 1 is currently in the rolling gap 9. If however the first change point 4 has been reached - see Figure 4 - in a step S4 the control computer terminates rolling of the rolled product 1 to the first desired dimension dl by corresponding activation of the rolling stand 5. Regardless of further measures, which are implemented in a step S5 and which are set out in further detail below, this introduces a first step 12 into the rolled product 1 at the first change point 4. The further measures of step S5 can vary in nature. In the simplest instance - see Figure 5 - the rolling stand 5 is raised (naturally due to corresponding activation by the control computer 6), when the point 10 currently in the rolling gap 9 corresponds to the first change point 4. Raising the rolling stand 5 has the advantage that it can also be done by means of control elements, which can only be displaced when load-free. The rolled product 1 is then removed forward (see arrow V) or backward (see arrow R) from the rolling stand 5. Because the rolling stand 5 is raised, the rolled product 1 therefore passes through the rolling gap 9 without being worked. It is however also possible for rolling per se to continue after the termination of rolling to the first desired dimension d1. In contrast to the simple raising of the rolling stand 5 in this instance it is necessary for it to be possible to displace the control elements under load. In this instance for example - see Figure 6 - the rolling stand 5 can be set by the control computer 6 to a new (second) desired dimension d2 and the rolled product 1 can be rolled to the second desired dimension d2* in the direction of the rolled product end 3 after reaching the first change point 4. The second desired dimension d2* can be smaller than the first desired dimension dl. It is preferably greater than the first desired dimension dl, since it is then possible to set to the second desired dimension d2* more rapidly. If rolling continues, it is possible for the rolled product 1 to be rolled to the second desired dimension d2* until the rolled product 1 has been rolled in its entirety, in other words the rolled product end 3 has passed through the rolling gap 9. It is however also possible - see Figure 7 - for rolling of the rolled product 1 to the second desired dimension d2* to be terminated, when the point 10 of the rolled product 1 currently in the rolling gap 9 corresponds to a previously determined second change point 13, which is located between the first change point 4 and the rolled product end 3. In this instance a second step 14 is introduced into the rolled product 1 at the second change point 13. The procedure for introducing the second step 14 at the second change point 14 is similar in every respect to the introduction of the first step 12 at the first change point 4. There is therefore no need for a detailed explanation here. Also the measures implemented after the introduction of the second step 14 are similar in every respect to the measures implemented after the introduction of the first step 12 at the first change point 4. In particular the rolling stand 5 can be raised - see Figure 8 - the rolling process being continued with a further desired dimension, etc. If the rolling gap 9 can be adjusted under load, it is also possible - starting from the state illustrated in Figure 4 - in the context of step S5 to continue the rolling process after the first change point 4 has been reached, but with the rolled product 1 being rolled in the direction of the rolled product start 2. In this instance the rolled product 1 is rolled to a second desired dimension d3, the second desired dimension d3 - see Figure 9 - being smaller than the first desired dimension dl. Theoretically it is possible for the rolled product 1 only to be rolled further from a point which is located between the first change point 4 and the rolled product start 2. However generally rolling to the second desired dimension d3 starts directly at the first change point 4. It is also possible for rolling of the rolled product 1 to the second desired dimension d3* to be terminated, when the point 10 of the rolled product 1 currently in the rolling gap 9 corresponds to a previously determined second change point 15. In this instance the second change point 15 is located between the rolled product start 2 and the first change point 4. In this instance a second step 16 is introduced into the rolled product 1 at the second change point 15. This is shown in Figure 10. Generally however the rolled product 1 is rolled to the second desired dimension d3* to the rolled product start 2. This state is shown in Figure 11. Even if it is in principle possible to continue rolling from the first change point 4, the rolling stand 5 is generally raised, so that the rolled product 1 passes through the rolling gap 9 without being worked from the first change point 4. This procedure has the advantage that it. can be carried out regardless of whether the rolling gap 9 can only be set in the load-free state or also under load. Regardless of this however the rolled product 1 has either passed through the rolling gap 9 in its entirety at some point (in other words to the rolled product end 3) or the rolled product 1 has been drawn back in its entirety from the rolling gap 9 (in other words up to the rolled product start 2). Both these instances are examined further below. When the rolled product 1 has passed through the rolling gap 9 in its entirety (in other words to the rolled product end 3) it is possible, starting with the rolled product end 3, to roll the rolled product 1 to a second desired dimension d4, until the point 10 currently in the rolling gap 9 corresponds to a second change point 17, which is located between the first change point 4 and the rolled product end 3. In this instance a second step 18 is introduced into the rolled product 1 at the second change point 17. The procedure is similar in every respect to the introduction of the first step 12 at the first change point 4, so there is no need for a detailed explanation of the procedure. The rolled product 1 with the second step 18 introduced therein is shown in Figure 12. In some instances more than one step can be introduced into the rolled product 1 in this pass too. When the rolled product 1 has been drawn back in its entirety from the rolling gap 9, in other words up to and including the rolled product start 2, it is possible to roll the rolled product 1 to a third desired dimension d5 after rolling to the first desired dimension d1* or - in the case of the embodiment in Figure 11 after rolling to the second desired dimension d3. In this instance the rolling process starts with the rolled product start 2 and is executed until the point 10 of the rolled product 1 currently in the rolling gap 9 corresponds to a second change point 19. It is possible - see Figure 13 - for the second change point 19 to be located between the rolled product start 2 and the first change point 4. In this instance a second, additional step 20 is introduced into the rolled product 1 at the second change point 19. It is however also possible for the second change point 19 to correspond to the first change point 4. In this instance the first step 12 is increased - see Figure 14. It is thus possible by means of the procedures described above to produce a rolled product 1 in a simple manner, said rolled product 1 having a number of segments 21 to 25 according to Figure 15, which have differing dimensions dl to d5 from one another. It is in particular possible to produce the rolled product 1 shown in Figure 15 even if the rolling stand 5 has control facilities for setting the rolling gap 9 that can only be adjusted in the load-free state, in other words not under load. The procedures described above can hereby be combined with one another in almost any manner. Claims 1. A rolling method for a rolled product (1), in particular a strip-type rolled product (1), which has a rolled product start (2) and a rolled product end (3), - the rolled product (1) being rolled to a first desired dimension (d1) in a rolling gap (9) of a rolling stand (5), starting with the rolled product start (2), - it being determined in an ongoing manner by a control computer (6) while the rolled product (1) is being rolled in the rolling stand (5) which point (10) of the rolled product (1) is currently in the rolling gap (9), - rolling of the rolled product (1) to the first desired dimension (dl) being terminated, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a previously determined first change point (4) of the rolled product (1), which is located between the rolled product start (2) and the rolled product end (3), so that a first step (12) is introduced into the rolled product (1) at the first change point (4). 2. The rolling method as claimed in claim 1, characterized in that the rolled product (1) is rolled to a second desired dimension (d2) in the direction of the rolled product end (3) after reaching the first change point (4). 3. The rolling method as claimed in claim 2, characterized in that the second desired dimension (d2) is greater or smaller than the first desired dimension (dl). 4. The rolling method as claimed in claim 2 or 3, characterized in that rolling of the rolled product (1) to the second desired dimension (d2) is terminated, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a previously determined second change point (13), which is located between the first change point (4) and the rolled product end (3), so that a second step (14) is introduced into the rolled product (1) at the second change point (13) . 5. The rolling method as claimed in claim 1, characterized in that the rolled product (1) is rolled to a second desired dimension (d3) in the direction of the rolled product start (2) after reaching the first change point (4). 6. The rolling method as claimed in claim 5, characterized in that rolling of the rolled product (1) to the second desired dimension (d3) is terminated, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a previously determined second change point (15), which is located between the rolled product start (2) and the first change point (4), so that a second step (16) is introduced into the rolled product (1) at the second change point (15). 7. The rolling method as claimed in claim 5, characterized in that the rolled product (1) is rolled to the second desired dimension (d3) to the rolled product start (2) . 8. The rolling method as claimed in claim 1, characterized in that the rolling stand (5) is raised, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to the first change point (4), so that the rolled product (1) passes through the rolling gap (9) without being worked after the rolling stand (5) has been raised. 9. The rolling method as claimed in claim 8, characterized in that the rolled product (1) passes through the rolling stand (5) backward. 10. The rolling method as claimed in claim 7 or 9, characterized in that after rolling to the first desired dimension (dl) or to the second desired dimension (d3), the rolled product (1) is rolled to a third desired dimension (d5) in the rolling gap (9) of the rolling stand (5) starting with the rolled product start (2), until the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a second change point (19). 11. The rolling method as claimed in claim 10, characterized in that the second change point (19) is located between the rolled product start (2) and the first change point (4) so that a second step is introduced into the rolled product (1) at the second change point (19). 12. The rolling method as claimed in claim 10, characterized in that the second change point (19) corresponds to the first change point (4) so the first step (12) is increased. 13. The rolling method as claimed in one of the preceding claims, characterized in that the rolled product (1) passes in its entirety through the rolling stand (5) and then, starting with the rolled product end (3), is rolled to a second desired dimension (d4) until the point currently in the rolling gap (9) corresponds to a second change point (17), which is located between the first change point (4) and the rolled product end (3) so that a second step (18) is introduced into the rolled product (1) at the second change point (17). 14. A data medium with a computer program (7) stored on the data medium for implementing a rolling method as claimed in one of the preceding claims, when the computer program (7) is executed by a control computer (6) for a rolling stand (5). 15. A control computer for a rolling stand (5), which is configured, in particular programmed, so that the rolling stand (5) can be activated by it according to a rolling method as claimed in one of claims 1 to 13. 16. A rolled product, in particular a strip-type rolled product, characterized in that it was produced according to a rolling method as claimed in one of claims 1 to 13. 17. A rolled product, in particular a strip-type rolled product, characterized in that it has at least two segments (21 to 25) in the longitudinal direction, which have differing dimensions (d1 to d5) from one another. A rolled product (1) has a rolled product start (2) and a rolled product end (3). The rolled product (1) is rolled to a first desired dimension (dl) in a rolling gap (9) of a rolling stand (5), starting with the rolled product start (2). It is determined in an ongoing manner by a control computer (6) while the rolled product (1) is being rolled in the rolling stand (5) which point (10) of the rolled product (1) is currently in the rolling gap (9). Rolling of the rolled product (1) to the first desired dimension (dl) is terminated, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a previously determined first change point (4) of the rolled product (1), which is located between the rolled product start (2) and the rolled product end (3), so that a first step (12) is introduced into the rolled product (1) at the first change point (4).

Full Text

Description
Rolling method for a rolled product for introducing a step
into the rolled product
The present invention relates to a rolling method for a rolled
product, in particular a strip-type rolled product, which has
a rolled product start and a rolled product end, the rolled
product being rolled to a first desired dimension in a rolling
gap of a rolling stand, starting with the start of the rolled
product.
The present invention also relates to a data medium with a
computer program stored on the data medium for implementing
such a rolling method, when the computer program is executed
by a control computer for a rolling stand. The present
invention also relates to a control computer for a rolling
stand, which is configured - in particular programmed - in
such a manner that the rolling stand can be activated by it
according to such a rolling method. Finally the present
invention relates to a rolled product, in particular a strip-
type rolled product.
Rolling methods, data media, control computers and rolled
products of the type mentioned in the introduction are
generally known. In particular with the rolling methods of the
type mentioned in the introduction the entire rolled product
is rolled to the first desired dimension, in other words from
the rolled product start to the rolled product end.
In some instances it would be expedient and useful to roll the
rolled product to different desired dimensions, with the
rolled product to be kept as a unit that is continuous per se.

A solution to this problem is not known in the prior art to
the knowledge of the applicant. It is known that the entire
rolled product can first be rolled to a first desired
dimension and the rolled product can then be divided, with one
of the segments of the rolled product thus resulting being
rolled to a second desired dimension. In this instance however
the two segments of the rolled product are no longer
continuous in respect of one another.
The procedure described just above also has further
disadvantages. In particular the process of dividing the
rolled product into two segments is often time-consuming. This
results in temperature losses, which in turn have a negative
influence on subsequent rolling processes. The time; required
to separate the individual segments means that this procedure
can only be used to produce a rolled product, which has
maximum two desired dimensions, and this only in segments that
are separated from one another.
The object of the present invention is to create a rolling
method, a data medium and a control computer for a rolling
stand, which can be used to produce a rolled product, which is
configured as continuous per se and has at least two segments
in the longitudinal direction, said segments having different
dimensions from one another.
The object is achieved for the rolling method in that while
the rolled product is being rolled in the rolling stand, a
control computer determines in an ongoing manner which point
of the rolled product is currently in the rolling gap and
rolling of the rolled product to the first desired dimension
is terminated, when the point of the rolled product currently
in the rolling gap corresponds to a previously determined

first change point of the rolled product, which is located
between the start of the rolled product and the end of the
rolled product, so that a first step is introduced into the
rolled product at the first change point.
In a corresponding manner the object for the data medium is
achieved in that it stores a computer program, which serves to
implement such a rolling method, when the computer program is
executed by a control computer for a rolling stand.
Finally the object is achieved by a control computer for a
rolling stand, which is configured, in particular programmed,
in such a manner that the rolling stand can be activated by it
according to such a rolling method.
This basic form of the present invention can be realized
regardless of the manner in which the rolling gap is set.
In modern rolling stands the rolling gap is generally set by
way of hydraulic cylinder units. Compared with other control
elements such hydraulic cylinder units have the advantage that
they can be adjusted not only in the load-free state but also
under load. In particular if the rolling stand has such
control elements that can be adjusted under load, it is
possible for the rolled product to be rolled to a second
desired dimension in the direction of the end of the rolled
product after reaching the first change point.
In this instance the second desired dimension can be smaller
than the first desired dimension. Generally it will be greater
than the first desired dimension.

To complete the picture, it should be pointed out that to set
the rolling gap under load the rolling speed generally has to
be different from zero. The first step is therefore generally
somewhat rounded. Alternatively it is also possible for the
rollers of the rolling stand to be supported in roller
bearings and the contact time at zero rolling speed to be kept
so short that damage to the rollers - in particular burn
damage - can be avoided.
It is possible for the rolled product to be rolled to the
second desired dimension from the first change point to the
end of the rolled product. It is also possible for rolling of
the rolled product to the second desired dimension to be
terminated when the point of the rolled product currently in
the rolling gap corresponds to a previously determined second
change point, which is located between the first change point
and the end of the rolled product, so that a second step is
introduced into the rolled product at the second change point.
As an alternative to rolling to the end of the rolled product,
the rolled product can also be rolled to a second desired
dimension in the direction of the start of the rolled product
after reaching the first change point. Rolling to the second
desired dimension can take place at the first change point or
only from a point closer to the start of the rolled product.
It is possible for rolling of the rolled product to the second
desired dimension to be terminated, when the point of the
rolled product currently in the rolling gap corresponds to a
previously determined second change point, which is located
between the start of the rolled product and the first change
point, so that a second step is introduced into the rolled
product at the second change point. The rolled product is

generally rolled to the second desired dimension to the start
of the rolled product.
As an alternative to continuing rolling, it is also possible
for the rolling stand to be raised, when the point of the
rolled product currently in the rolling gap corresponds to the
first change point, so that the rolled product passes through
the rolling gap without being worked after the rolling stand
has been raised. This procedure can then also be carried out,
when the control elements for adjusting the rolling gap can
only be adjusted in the load-free state.
The rolled product can pass through the - then raised -
rolling stand without being worked either forward (in other
words in the previous rolling direction) or backward.
When the rolled product passes through backward without being
worked or has been rolled to the second desired dimension from
the first change point to the start of the rolled product, it
is possible for the rolled product, after rolling to the first
and/or second desired dimension, starting with the start of
the rolled product, to be rolled to a third desired dimension
in the rolling gap of the rolling stand, until the point of
the rolled product currently in the rolling gap corresponds to
a second change point.
The second change point can be located between the start of
the rolled product and the first change point, so that a
second step is introduced into the rolled product at the
second change point. The second change point can also
correspond to the first change point, so that the first step
is increased.

In contrast, when the rolled product has passed in its
entirety through the rolling stand, it is possible for the
rolled product then to be rolled to a second desired
dimension, starting with the end of the rolled product, until
the point currently in the rolling gap corresponds to a second
change point, which is located between the first change point
and the end of the rolled product, so that a second step is
introduced into the rolled product at the second change point.
Rolling to the second dimension is of course also terminated
at the second change point in this instance.
Further advantages and details will emerge from the
description which follows of exemplary embodiments in
conjunction with the basic outlines in the drawings, in which:
Figure 1 shows the basic structure of a rolling
arrangement,
Figure 2 shows a flow diagram,
Figures 3 to 14 show different states during the rolling
of a rolled product and
Figure 15 shows a rolled product after rolling.
According to Figure 1 a rolled product 1 is to be rolled. The
rolled product 1 here is preferably a strip-type rolled
product 1. However a rod-type rolled product or a tubular
rolled product could also be rolled.
The rolled product 1 has a rolled product start 2 and a rolled
product end 3. Also at least one change point 4 - also
referred to below as the first change point 4 - is predefined.
The change point 4 is preferably not defined by its distance
from the rolled product start 2 or the rolled product end 3,

since this distance changes as the rolled product 1 is rolled.
Rather the change point 4 is preferably determined by the
quantity of material of the rolled product 1 between the
change point 4 and the rolled product start 2 or the rolled
product end 3.
The rolled product 1 is rolled in a rolling stand 5. For its
part the rolling stand 5 is controlled by a control computer
6. A computer program 7 is supplied to the control computer 6.
The computer program 7 can be supplied for example by means of
a portable or otherwise data medium 8, on which the computer
program 7 is- stored in (exclusively) machine-readable form.
Supplying the computer program 7 programs (or more generally
configures) the control computer 6 in such a manner that it
executes a rolling method, which is described below in
conjunction with Figures 2 to 14.
According to Figure 2 in a step S1 the control computer 6
activates the rolling stand 5 in such a manner that the rolled
product 1 is rolled to a first desired dimension dl* (in the
case of a strip-type rolled product 1 therefore to a first
desired thickness dl*) from the rolled product start 2.
Determination of the necessary control parameters for the
rolling stand 5 by means of a pass schedule and the stand
parameters of the rolling stand 5 is generally know to those
skilled in the art. The actual rolling process, in other words
the working of the rolled product 1, takes place in a rolling
gap 9 of the rolling stand 5.
In a step S2 the control computer 6 determines which point 10
of the rolled product 1 is currently in the rolling gap 9. The
point 10 can be determined for example by way of a generally
known material monitoring system 11.

In a step S3 the control computer 6 compares the point 10
determined in step S2 with the first change point 4. If the
first change point 4 has not yet been reached - see for
example Figure 3 - the control computer 6 returns to step S2.
This return to step S2 on the one hand causes the rolling
process, which was started in step S1, to be continued. On the
other hand step S2 is executed again, so that as a result the
control computer 6 determines in an ongoing manner while the
rolled product 1 is being rolled in the rolling stand 5 which
point of the rolled product. 1 is currently in the rolling gap
9.
If however the first change point 4 has been reached - see
Figure 4 - in a step S4 the control computer terminates
rolling of the rolled product 1 to the first desired dimension
dl* by corresponding activation of the rolling stand 5.
Regardless of further measures, which are implemented in a
step S5 and which are set out in further detail below, this
introduces a first step 12 into the rolled product 1 at the
first change point 4.
The further measures of step S5 can vary in nature. In the
simplest instance - see Figure 5 - the rolling stand 5 is
raised (naturally due to corresponding activation by the
control computer 6), when the point 10 currently in the
rolling gap 9 corresponds to the first change point 4. Raising
the rolling stand 5 has the advantage that it can also be done
by means of control elements, which can only be displaced when
load-free. The rolled product 1 is then removed forward (see
arrow V) or backward (see arrow R) from the rolling stand 5.
Because the rolling stand 5 is raised, the rolled product 1

therefore passes through the rolling gap 9 without being
worked.
It is however also possible for rolling per se to continue
after the termination of rolling to the first desired
dimension d1*. In contrast to the simple raising of the
rolling stand 5 in this instance it is necessary for it to be
possible to displace the control elements under load. In this
instance for example - see Figure 6 - the rolling stand 5 can
be set by the control computer 6 to a new (second) desired
dimension d2* and the rolled product 1 can be rolled to the
second desired dimension d2* in the direction of the rolled
product end 3 after reaching the first change point 4.
The second desired dimension d2* can be smaller than the first
desired dimension dl*. It is preferably greater than the first
desired dimension dl*, since it is then possible to set to the
second desired dimension d2* more rapidly.
If rolling continues, it is possible for the rolled product 1
to be rolled to the second desired dimension d2* until the
rolled product 1 has been rolled in its entirety, in other
words the rolled product end 3 has passed through the rolling
gap 9. It is however also possible - see Figure 7 - for
rolling of the rolled product 1 to the second desired
dimension d2* to be terminated, when the point 10 of the
rolled product 1 currently in the rolling gap 9 corresponds to
a previously determined second change point 13, which is
located between the first change point 4 and the rolled
product end 3. In this instance a second step 14 is introduced
into the rolled product 1 at the second change point 13.

The procedure for introducing the second step 14 at the second
change point 14 is similar in every respect to the
introduction of the first step 12 at the first change point 4.
There is therefore no need for a detailed explanation here.
Also the measures implemented after the introduction of the
second step 14 are similar in every respect to the measures
implemented after the introduction of the first step 12 at the
first change point 4. In particular the rolling stand 5 can be
raised - see Figure 8 - the rolling process being continued
with a further desired dimension, etc.
If the rolling gap 9 can be adjusted under load, it is also
possible - starting from the state illustrated in Figure 4 -
in the context of step S5 to continue the rolling process
after the first change point 4 has been reached, but with the
rolled product 1 being rolled in the direction of the rolled
product start 2. In this instance the rolled product 1 is
rolled to a second desired dimension d3*, the second desired
dimension d3* - see Figure 9 - being smaller than the first
desired dimension dl*.
Theoretically it is possible for the rolled product 1 only to
be rolled further from a point which is located between the
first change point 4 and the rolled product start 2. However
generally rolling to the second desired dimension d3* starts
directly at the first change point 4.
It is also possible for rolling of the rolled product 1 to the
second desired dimension d3* to be terminated, when the point
10 of the rolled product 1 currently in the rolling gap 9
corresponds to a previously determined second change point 15.
In this instance the second change point 15 is located between
the rolled product start 2 and the first change point 4. In

this instance a second step 16 is introduced into the rolled
product 1 at the second change point 15. This is shown in
Figure 10. Generally however the rolled product 1 is rolled to
the second desired dimension d3* to the rolled product start
2. This state is shown in Figure 11.
Even if it is in principle possible to continue rolling from
the first change point 4, the rolling stand 5 is generally
raised, so that the rolled product 1 passes through the
rolling gap 9 without being worked from the first change point
4. This procedure has the advantage that it. can be carried out
regardless of whether the rolling gap 9 can only be set in the
load-free state or also under load. Regardless of this however
the rolled product 1 has either passed through the rolling gap
9 in its entirety at some point (in other words to the rolled
product end 3) or the rolled product 1 has been drawn back in
its entirety from the rolling gap 9 (in other words up to the
rolled product start 2). Both these instances are examined
further below.
When the rolled product 1 has passed through the rolling gap 9
in its entirety (in other words to the rolled product end 3)
it is possible, starting with the rolled product end 3, to
roll the rolled product 1 to a second desired dimension d4*,
until the point 10 currently in the rolling gap 9 corresponds
to a second change point 17, which is located between the
first change point 4 and the rolled product end 3. In this
instance a second step 18 is introduced into the rolled
product 1 at the second change point 17. The procedure is
similar in every respect to the introduction of the first step
12 at the first change point 4, so there is no need for a
detailed explanation of the procedure. The rolled product 1
with the second step 18 introduced therein is shown in Figure

12. In some instances more than one step can be introduced
into the rolled product 1 in this pass too.
When the rolled product 1 has been drawn back in its entirety
from the rolling gap 9, in other words up to and including the
rolled product start 2, it is possible to roll the rolled
product 1 to a third desired dimension d5* after rolling to
the first desired dimension d1* or - in the case of the
embodiment in Figure 11 after rolling to the second desired
dimension d3*. In this instance the rolling process starts
with the rolled product start 2 and is executed until the
point 10 of the rolled product 1 currently in the rolling gap
9 corresponds to a second change point 19.
It is possible - see Figure 13 - for the second change point
19 to be located between the rolled product start 2 and the
first change point 4. In this instance a second, additional
step 20 is introduced into the rolled product 1 at the second
change point 19. It is however also possible for the second
change point 19 to correspond to the first change point 4. In
this instance the first step 12 is increased - see Figure 14.
It is thus possible by means of the procedures described above
to produce a rolled product 1 in a simple manner, said rolled
product 1 having a number of segments 21 to 25 according to
Figure 15, which have differing dimensions dl to d5 from one
another. It is in particular possible to produce the rolled
product 1 shown in Figure 15 even if the rolling stand 5 has
control facilities for setting the rolling gap 9 that can only
be adjusted in the load-free state, in other words not under
load. The procedures described above can hereby be combined
with one another in almost any manner.

Claims
1. A rolling method for a rolled product (1), in particular
a strip-type rolled product (1), which has a rolled product
start (2) and a rolled product end (3),
- the rolled product (1) being rolled to a first desired
dimension (d1*) in a rolling gap (9) of a rolling stand (5),
starting with the rolled product start (2),
- it being determined in an ongoing manner by a control
computer (6) while the rolled product (1) is being rolled in
the rolling stand (5) which point (10) of the rolled product
(1) is currently in the rolling gap (9),
- rolling of the rolled product (1) to the first desired
dimension (dl*) being terminated, when the point (10) of the
rolled product (1) currently in the rolling gap (9)
corresponds to a previously determined first change point (4)
of the rolled product (1), which is located between the rolled
product start (2) and the rolled product end (3), so that a
first step (12) is introduced into the rolled product (1) at
the first change point (4).

2. The rolling method as claimed in claim 1,
characterized in that the rolled product (1) is rolled to a
second desired dimension (d2*) in the direction of the rolled
product end (3) after reaching the first change point (4).
3. The rolling method as claimed in claim 2,
characterized in that the second desired dimension (d2*) is
greater or smaller than the first desired dimension (dl*).
4. The rolling method as claimed in claim 2 or 3,
characterized in that rolling of the rolled product (1) to the
second desired dimension (d2*) is terminated, when the point

(10) of the rolled product (1) currently in the rolling gap
(9) corresponds to a previously determined second change point
(13), which is located between the first change point (4) and
the rolled product end (3), so that a second step (14) is
introduced into the rolled product (1) at the second change
point (13) .
5. The rolling method as claimed in claim 1,
characterized in that the rolled product (1) is rolled to a
second desired dimension (d3*) in the direction of the rolled
product start (2) after reaching the first change point (4).
6. The rolling method as claimed in claim 5,
characterized in that rolling of the rolled product (1) to the
second desired dimension (d3*) is terminated, when the point
(10) of the rolled product (1) currently in the rolling gap
(9) corresponds to a previously determined second change point
(15), which is located between the rolled product start (2)
and the first change point (4), so that a second step (16) is
introduced into the rolled product (1) at the second change
point (15).
7. The rolling method as claimed in claim 5,
characterized in that the rolled product (1) is rolled to the
second desired dimension (d3*) to the rolled product start
(2) .
8. The rolling method as claimed in claim 1,
characterized in that the rolling stand (5) is raised, when
the point (10) of the rolled product (1) currently in the
rolling gap (9) corresponds to the first change point (4), so
that the rolled product (1) passes through the rolling gap (9)
without being worked after the rolling stand (5) has been

raised.
9. The rolling method as claimed in claim 8,
characterized in that the rolled product (1) passes through
the rolling stand (5) backward.
10. The rolling method as claimed in claim 7 or 9,
characterized in that after rolling to the first desired
dimension (dl*) or to the second desired dimension (d3*), the
rolled product (1) is rolled to a third desired dimension
(d5*) in the rolling gap (9) of the rolling stand (5) starting
with the rolled product start (2), until the point (10) of the
rolled product (1) currently in the rolling gap (9)
corresponds to a second change point (19).
11. The rolling method as claimed in claim 10,
characterized in that the second change point (19) is located
between the rolled product start (2) and the first change
point (4) so that a second step is introduced into the rolled
product (1) at the second change point (19).
12. The rolling method as claimed in claim 10,
characterized in that the second change point (19) corresponds
to the first change point (4) so the first step (12) is
increased.
13. The rolling method as claimed in one of the preceding
claims,
characterized in that the rolled product (1) passes in its
entirety through the rolling stand (5) and then, starting with
the rolled product end (3), is rolled to a second desired
dimension (d4*) until the point currently in the rolling gap
(9) corresponds to a second change point (17), which is

located between the first change point (4) and the rolled
product end (3) so that a second step (18) is introduced into
the rolled product (1) at the second change point (17).
14. A data medium with a computer program (7) stored on the
data medium for implementing a rolling method as claimed in
one of the preceding claims, when the computer program (7) is
executed by a control computer (6) for a rolling stand (5).
15. A control computer for a rolling stand (5), which is
configured, in particular programmed, so that the rolling
stand (5) can be activated by it according to a rolling method
as claimed in one of claims 1 to 13.
16. A rolled product, in particular a strip-type rolled
product, characterized in that it was produced according to a
rolling method as claimed in one of claims 1 to 13.
17. A rolled product, in particular a strip-type rolled
product, characterized in that it has at least two segments
(21 to 25) in the longitudinal direction, which have differing
dimensions (d1 to d5) from one another.

A rolled product (1) has a rolled product start (2) and a rolled product end (3). The rolled product (1) is rolled to a first desired dimension (dl*) in a rolling gap (9) of a
rolling stand (5), starting with the rolled product start (2). It is determined in an ongoing manner by a control computer (6) while the rolled product (1) is being rolled in the
rolling stand (5) which point (10) of the rolled product (1) is currently in the rolling gap (9). Rolling of the rolled product (1) to the first desired dimension (dl*) is terminated, when the point (10) of the rolled product (1) currently in the rolling gap (9) corresponds to a previously determined first change point (4) of the rolled product (1), which is located between the rolled product start (2) and the rolled product end (3), so that a first step (12) is
introduced into the rolled product (1) at the first change point (4).

Documents:

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Patent Number

272421

Indian Patent Application Number

3772/KOLNP/2008

PG Journal Number

14/2016

Publication Date

01-Apr-2016

Grant Date

31-Mar-2016

Date of Filing

15-Sep-2008

Name of Patentee

SIEMENS AKTIENGESELLSCHAFT

Applicant Address

WITTELSBACHERPLATZ 2, 80333 MUNCHEN

Inventors:

#	Inventor's Name	Inventor's Address
1	DIRK KRAUTWURST	KLEINE HULSKATHSTR. 4 46149 OBERHAUSEN
2	EDMUND KOH	4B KIM TIAN RD. 169245
3	BIRGER SCHMIDT	AM ROSENHOF 29, 09618 BRAND-ERBISDORF

PCT International Classification Number

B21B 37/26

PCT International Application Number

PCT/EP2007/051221

PCT International Filing date

2007-02-08

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	102006011939.8	2006-03-15	Germany