Title of Invention	METHOD FOR THE PRODUCTION OF A BEARING RING FOR LARGE-SIZE ROLLING BEARINGS
Abstract	The invention relates to a methods for producing a bearing ring (1) for large-size rolling bearing comprising at least one track (3) that is provided with a hardened peripheral layer. According to said invention, the peripheral layer that is to be hardened is exposed to the electric field of an inductor in order to be heated and is then quenched. The invention is characterized in that a) at least two inductors (2) are disposed above a common zone (a) of the annular track (3) that is to be hardened at the beginning of the hardening process and said inductors (2) heat the opposite peripheral layer to a hardening temperature there, b) the inductors (2) are moved in the opposite direction along the annular track in order to heat the adjacent central zones (b), c) sprinklers (5) that are directed onto the heated peripheral layers are turned on following a short distance, and the peripheral layers are quenched starting from the center of the zone (a) that was heated at the beginning, d) the inductors (2) and the sprinklers (5) continue to be moved on the halves of the rings thereof until coinciding again in a zone (c) located opposite the point of departure and forming a joint heating zone once again there, e) both inductors (2) are lifted perpendicular to the surface of the track (3) upon reaching the required hardening temperature, and f) the sprinklers (5) are directed onto zone (c).

Title of Invention

METHOD FOR THE PRODUCTION OF A BEARING RING FOR LARGE-SIZE ROLLING BEARINGS

Abstract

The invention relates to a methods for producing a bearing ring (1) for large-size rolling bearing comprising at least one track (3) that is provided with a hardened peripheral layer. According to said invention, the peripheral layer that is to be hardened is exposed to the electric field of an inductor in order to be heated and is then quenched. The invention is characterized in that a) at least two inductors (2) are disposed above a common zone (a) of the annular track (3) that is to be hardened at the beginning of the hardening process and said inductors (2) heat the opposite peripheral layer to a hardening temperature there, b) the inductors (2) are moved in the opposite direction along the annular track in order to heat the adjacent central zones (b), c) sprinklers (5) that are directed onto the heated peripheral layers are turned on following a short distance, and the peripheral layers are quenched starting from the center of the zone (a) that was heated at the beginning, d) the inductors (2) and the sprinklers (5) continue to be moved on the halves of the rings thereof until coinciding again in a zone (c) located opposite the point of departure and forming a joint heating zone once again there, e) both inductors (2) are lifted perpendicular to the surface of the track (3) upon reaching the required hardening temperature, and f) the sprinklers (5) are directed onto zone (c).

Full Text	WO 2006/08715 2 PCT/EP2006/001266 1 METHOD FOR THE PRODUCTION OF A BEARING RING FOR LARGE-SIZE ROLLING BEARINGS Description: The invention relates to a method for producing a bearing ring for large-size rolling bearings comprised of at least one race with a hardened peripheral layer in which the peripheral layer that is to be hardened is exposed to the electric field of an inductor in order to be heated and is then quenched. Large-size rolling bearings in the sense of the present patent application are to be understood as rolling bearings whose bearing rings are bolted through axially introduced passage and/or threaded bores with the connecting structures. Depending on their layout, large-size rolling bearings may be comprised of one or more ball or roller arrays. Appurtenant to each ball or roller array are two races which are finished by metal cutting in two to three bearing rings and subsequently hardened. Such bearing rings can be formed as nose rings, support rings, holder rings, disk-like axial rings, external rings or internal rings, etc. The races of the bearing rings of large-size rolling bearings are hardened in feed operation with one or two inductors, applying a prior art method. According to this inductive feed hardening method, a so-called inductor, i.e. an induction coil or a pair of induction coils is provided for heating of the race, while for quenching a sprinkler fastened to the inductor and provided for feeding of cooling liquid is arranged above a zone of the race to be hardened which is small in relation to the ring diameter. During hardening, the inductor and the sprinkler once pass over the contour of the race of the entire ring in peripheral direction at constant feedrate of the ring, so that each segment of the race is continuously heated and quenched. WO 2006/087152 PCT/EP2006/001266 2 With this prior art method, a small segment (slip), which due to the process applied is incompletely heated, still remains at the end point of hardening, in the area of which the race remains softer. Furthermore, according to the method described in DE 10228333 Cl, the races of the bearing rings of large-size rolling bearings can be simultaneously heated with annular inductors by applying a full-surface recirculating heating process, which is also called shot-hardening, and subsequently be hardened by quenching. The benefit of this method lies in avoiding the soft spot described before. Applying this method involves relatively high costs for the inductors as well as high generator performance rates. With very large rings, a uniform heating is problematic due to temperature-conditioned dilatation. Now, therefore, it is the object of the present invention to provide a method for producing bearing rings for large-size rolling bearings by which high peripherally constant hardness, i.e. without any slip, can be achieved in the races. The solution to this task is indicated in claim 1. Sub-claims 2 to 7 contain purposive complementary measures. According to the inventive solution, it is provided for that a) at the beginning of hardening, at least two inductors are arranged above a joint zone (a) of the annular race to be hardened and heat the peripheral layer juxtaposed there to the hardening temperature; b) for heating of the subsequent middle zone (b), the inductors can be moved in opposite direction along the annular race; c) after covering a short distance, sprinklers directed onto the heated peripheral layers are turned-on and these layers are quenched, proceeding from the center of the zone (a) heated at the beginning; WO 2006/087152 PCT/EP2006/001266 3 d) the inductors and the sprinklers are continually moved on their ring halves until they coincide again at a zone (c) lying opposite to the point of departure and again form a joint heating zone there; e) after reaching the required hardening temperature of the zone (c), both inductors are lifted perpendicular from the surface of the race, and f) sprinklers are directed onto the zone (c). With the inventive method, at least two inductors, preferably two induction coils or two pairs of induction coils, and sprinklers preferably fastened thereto, are arranged above a zone of the race to be hardened which is small in relation to the ring diameter. At the beginning of this method, both inductors are arranged directly side by side and heat the race peripheral layer lying underneath to the hardening temperature (vide Pos.I in the attached FIGS. 1 and 3). The configuration of a joint heating zone with a constant depth can be achieved by a pendulum-like movement of the inductors or of the ring and by way of an adapted performance control. Subsequently, the two inductors move apart at constant feed in opposite peripheral direction each along the annular peripheral layer of the race to be hardened. Having covered a short distance, the sprinklers which are preferably pivoted to the inductors are turned-on and quench the center of the zone heated at the beginning and divide the zone heated to the hardening temperature into two halves. At a constant feed, each inductor subsequently passes over the race surface of one half of the ring diameter in opposite direction (Pos. II) until both inductors again coincide at a race section lying opposite to the point of departure and form a joint heating zone (Pos. IS). As a variant to the method described in FIG. 1, it is possible to provide for a simultaneous pre-warming of the area lying opposite to the point of departure by way of a third inductor (vide FIG. 2). The third inductor is removed as soon as the other two inductors approach each other for hardening this zone and form a joint heating zone analogously to Pos. Ill of FIG. 1. When both inductors have formed a joint, closed heating zone wherein the race surface temperature ranges at the hardening temperature, both inductors move vertically away from the surface. By swivelling the sprinkler jet into the space between the race surface and the inductors, the joint heating zone is simultaneously quenched. WO 2006/087152 PCT/E2006/001266 4 As a measure designed to assure uniform, even heating of the race in the areas of joint heating zones of both inductors, it is additionally possible to provide grooves or bores, preferably extending radially or axially, at the peripheral rims of the races. The present invention is further elucidated by way of the attached FIGS. 1 to 4 taken as examples, where: FIG. 1 and 2 are perspective views of a bearing ring with various inductor positions I to IV; FIG.3 shows a schematic cross section of the inductors 2 and sprinklers 5 in various inductor positions I to IV; FIG. 4a shows a circular segment of race 3 with a representation of the joint heating zones a, c; and FIG. 4b shows an embodiment modified versus FIG. 4a with bores or grooves 6 introduced at the peripheral rims of race 3 and leading to the represented magnified view of the joint heating zones a, c. FIG. 1 shows the bearing ring 1 with the axial race 3 to be hardened, and the inductors 2 in various inductor positions I to IV. In position I, at the beginning of heating, zone (a) shown in dashed lines is heated. The two inductors 2 then move along the annular race 3 in the direction of the arrow via the position II with the appurtenant central heating zones (b) into position III with the heating zone (c) there. Upon the end of heating, the inductors 2 are lifted in axial direction from position III into position IV so that the sprinklers pivoted to inductors 2 can also quench the peripheral layer in the area of zone (c). Schematically shown in FIG. 3 are the inductors 2 and sprinklers 5 in the four different inductor positions I and IV. In positions I to III, sprinklers 5 are arranged above at the relevant inductors 2. In positions II and III, the sprinkler jets are shown in dashed lines WO 2006/087152 PCT/EP2006/001266 5 and directed onto the peripheral layer of the race which has just been heated by the aid of inductors 2. In position I, the inductors 2 are still arranged directly side by side and sprinklers 5 have been turned off. In position II, the inductors 2 have moved away a short distance from the 0° line and the sprinkler jets are obliquely directed backwardly on the race. In position III, the inductors 2 have again been united up to the 180° line. By lifting the inductors 2 after position IV, the sprinklers pivoted to the inductors are so swivelled that the sprinkler jets are initially directed perpendicular onto the peripheral layer and later-on, if required, even on the surface under inductors 2. Additionally shown in the variant according to FIG. 2 is the inductor 4 for pre-heating which is removed from this area as soon as the other two inductors 2 approach this area. From FIG. 4ab and 4b it becomes evident how the joint heating zones (a), (c) are enhanced if appropriate bores or grooves 6 are introduced at the peripheral rims of race 3. i WO 2006/087152 PCT/EP2006/001266 6 List of Reference Symbols 1 Bearing ring 2 Inductor (induction coils and/or pairs of induction coils) 3 Race of 1 4 Inductor for pre-heating 5 Sprinkler at 2 6 Bore or groove in 1 (a) Heating zone at the start (b) Central heating zone (c) Heating zone at the end I Inductor position at the start of heating II Inductor position during heating and hardening III Inductor position at the end of heating and hardening IV Inductor position upon the end of heating WO 2006/087152 PCT/EP2006/001266 7 Claims: 1. A method for producing a bearing ring (1) for large-size rolling bearings comprising at least one race (3) with a hardened peripheral layer, wherein the peripheral layer to be hardened is exposed to the electric field of an inductor in order to be heated and is then quenched, characterized in that (a) at the beginning of hardening, at least two inductors (2) are arranged above a joint zone (a) of the annular race to be hardened and heat the peripheral layer juxtaposed there to the hardening temperature; (b) for heating of the subsequent central zone (b), the inductors (2) can be moved in opposite direction along the annular race; (c) after covering a short distance, sprinklers (5) directed onto the heated peripheral layers are turned on and these layers are quenched, proceeding from the center of the zone (a) heated at the beginning; (d) the inductors (2) and sprinklers (5) are continually moved on their ring halves until they coincide again at a zone (c) lying opposite to the point of departure and again form a joint heating zone there; (e) after reaching the required hardening temperature of the zone (c), both inductors (2) are vertically lifted from the surface of the race (3), and (f) the sprinklers (5) are directed onto the zone (c). (g) A method as defined in claim 1, characterized in that zone (c) is already heated by an additional inductor (1) during heating of zones (a) and/or zones (b). 2. A method as defined in claim 1 or 2, characterized in that according to the inventive method axial and/or radial races (3) of a bearing ring (1) are hardened consecutively or simultaneously. WO 2006/087152 PCT/EP2006/001266 8 3. A method as defined at least in any one of the preceding claims, characterized in that the sprinklers (5) are jointly moved independently of the inductors (2) along the race (3) to be hardened. 4. A method as defined at least in any one of the preceding claims, characterized in that the sprinkler jets are also directed onto the race surface beneath the inductors (2). 5. A method as defined at least in any one of the preceding claims, characterized in that the inductors (2) and/or sprinklers (5) are moved like a pendulum when moving along the race to be hardened. 6. A method as defined at least in any one of the preceding claims, characterized in that at the beginning (a) and/or at the end (c), radially or axially extending bores or grooves (6) are introduced at the peripheral rims of the race into the joint heating zones. The invention relates to a methods for producing a bearing ring (1) for large-size rolling bearing comprising at least one track (3) that is provided with a hardened peripheral layer. According to said invention, the peripheral layer that is to be hardened is exposed to the electric field of an inductor in order to be heated and is then quenched. The invention is characterized in that a) at least two inductors (2) are disposed above a common zone (a) of the annular track (3) that is to be hardened at the beginning of the hardening process and said inductors (2) heat the opposite peripheral layer to a hardening temperature there, b) the inductors (2) are moved in the opposite direction along the annular track in order to heat the adjacent central zones (b), c) sprinklers (5) that are directed onto the heated peripheral layers are turned on following a short distance, and the peripheral layers are quenched starting from the center of the zone (a) that was heated at the beginning, d) the inductors (2) and the sprinklers (5) continue to be moved on the halves of the rings thereof until coinciding again in a zone (c) located opposite the point of departure and forming a joint heating zone once again there, e) both inductors (2) are lifted perpendicular to the surface of the track (3) upon reaching the required hardening temperature, and f) the sprinklers (5) are directed onto zone (c).

Full Text

WO 2006/08715 2 PCT/EP2006/001266
1
METHOD FOR THE PRODUCTION OF A BEARING RING FOR
LARGE-SIZE ROLLING BEARINGS
Description:
The invention relates to a method for producing a bearing ring for large-size rolling
bearings comprised of at least one race with a hardened peripheral layer in which the
peripheral layer that is to be hardened is exposed to the electric field of an inductor in
order to be heated and is then quenched.
Large-size rolling bearings in the sense of the present patent application are to be
understood as rolling bearings whose bearing rings are bolted through axially
introduced passage and/or threaded bores with the connecting structures. Depending on
their layout, large-size rolling bearings may be comprised of one or more ball or roller
arrays. Appurtenant to each ball or roller array are two races which are finished by
metal cutting in two to three bearing rings and subsequently hardened. Such bearing
rings can be formed as nose rings, support rings, holder rings, disk-like axial rings,
external rings or internal rings, etc.
The races of the bearing rings of large-size rolling bearings are hardened in feed
operation with one or two inductors, applying a prior art method. According to this
inductive feed hardening method, a so-called inductor, i.e. an induction coil or a pair of
induction coils is provided for heating of the race, while for quenching a sprinkler
fastened to the inductor and provided for feeding of cooling liquid is arranged above a
zone of the race to be hardened which is small in relation to the ring diameter. During
hardening, the inductor and the sprinkler once pass over the contour of the race of the
entire ring in peripheral direction at constant feedrate of the ring, so that each segment
of the race is continuously heated and quenched.

WO 2006/087152 PCT/EP2006/001266
2
With this prior art method, a small segment (slip), which due to the process applied is
incompletely heated, still remains at the end point of hardening, in the area of which the
race remains softer.
Furthermore, according to the method described in DE 10228333 Cl, the races of the
bearing rings of large-size rolling bearings can be simultaneously heated with annular
inductors by applying a full-surface recirculating heating process, which is also called
shot-hardening, and subsequently be hardened by quenching. The benefit of this method
lies in avoiding the soft spot described before.
Applying this method involves relatively high costs for the inductors as well as high
generator performance rates. With very large rings, a uniform heating is problematic
due to temperature-conditioned dilatation.
Now, therefore, it is the object of the present invention to provide a method for
producing bearing rings for large-size rolling bearings by which high peripherally
constant hardness, i.e. without any slip, can be achieved in the races.
The solution to this task is indicated in claim 1. Sub-claims 2 to 7 contain purposive
complementary measures.
According to the inventive solution, it is provided for that
a) at the beginning of hardening, at least two inductors are arranged above a joint
zone (a) of the annular race to be hardened and heat the peripheral layer
juxtaposed there to the hardening temperature;
b) for heating of the subsequent middle zone (b), the inductors can be moved in
opposite direction along the annular race;
c) after covering a short distance, sprinklers directed onto the heated peripheral
layers are turned-on and these layers are quenched, proceeding from the center
of the zone (a) heated at the beginning;

WO 2006/087152 PCT/EP2006/001266
3
d) the inductors and the sprinklers are continually moved on their ring halves until
they coincide again at a zone (c) lying opposite to the point of departure and
again form a joint heating zone there;
e) after reaching the required hardening temperature of the zone (c), both inductors
are lifted perpendicular from the surface of the race, and
f) sprinklers are directed onto the zone (c).
With the inventive method, at least two inductors, preferably two induction coils or two
pairs of induction coils, and sprinklers preferably fastened thereto, are arranged above a
zone of the race to be hardened which is small in relation to the ring diameter. At the
beginning of this method, both inductors are arranged directly side by side and heat the
race peripheral layer lying underneath to the hardening temperature (vide Pos.I in the
attached FIGS. 1 and 3). The configuration of a joint heating zone with a constant depth
can be achieved by a pendulum-like movement of the inductors or of the ring and by
way of an adapted performance control. Subsequently, the two inductors move apart at
constant feed in opposite peripheral direction each along the annular peripheral layer of
the race to be hardened. Having covered a short distance, the sprinklers which are
preferably pivoted to the inductors are turned-on and quench the center of the zone
heated at the beginning and divide the zone heated to the hardening temperature into
two halves. At a constant feed, each inductor subsequently passes over the race surface
of one half of the ring diameter in opposite direction (Pos. II) until both inductors again
coincide at a race section lying opposite to the point of departure and form a joint
heating zone (Pos. IS). As a variant to the method described in FIG. 1, it is possible to
provide for a simultaneous pre-warming of the area lying opposite to the point of
departure by way of a third inductor (vide FIG. 2). The third inductor is removed as
soon as the other two inductors approach each other for hardening this zone and form a
joint heating zone analogously to Pos. Ill of FIG. 1. When both inductors have formed a
joint, closed heating zone wherein the race surface temperature ranges at the hardening
temperature, both inductors move vertically away from the surface. By swivelling the
sprinkler jet into the space between the race surface and the inductors, the joint heating
zone is simultaneously quenched.

WO 2006/087152 PCT/E2006/001266
4
As a measure designed to assure uniform, even heating of the race in the areas of joint
heating zones of both inductors, it is additionally possible to provide grooves or bores,
preferably extending radially or axially, at the peripheral rims of the races.
The present invention is further elucidated by way of the attached FIGS. 1 to 4 taken as
examples, where:
FIG. 1 and 2 are perspective views of a bearing ring with various inductor positions I
to IV;
FIG.3 shows a schematic cross section of the inductors 2 and sprinklers 5 in
various inductor positions I to IV;
FIG. 4a shows a circular segment of race 3 with a representation of the joint
heating zones a, c; and
FIG. 4b shows an embodiment modified versus FIG. 4a with bores or grooves 6
introduced at the peripheral rims of race 3 and leading to the represented
magnified view of the joint heating zones a, c.
FIG. 1 shows the bearing ring 1 with the axial race 3 to be hardened, and the inductors 2
in various inductor positions I to IV. In position I, at the beginning of heating, zone (a)
shown in dashed lines is heated. The two inductors 2 then move along the annular race 3
in the direction of the arrow via the position II with the appurtenant central heating
zones (b) into position III with the heating zone (c) there. Upon the end of heating, the
inductors 2 are lifted in axial direction from position III into position IV so that the
sprinklers pivoted to inductors 2 can also quench the peripheral layer in the area of
zone (c).

Schematically shown in FIG. 3 are the inductors 2 and sprinklers 5 in the four different
inductor positions I and IV. In positions I to III, sprinklers 5 are arranged above at the
relevant inductors 2. In positions II and III, the sprinkler jets are shown in dashed lines

WO 2006/087152 PCT/EP2006/001266
5
and directed onto the peripheral layer of the race which has just been heated by the aid
of inductors 2. In position I, the inductors 2 are still arranged directly side by side and
sprinklers 5 have been turned off. In position II, the inductors 2 have moved away a
short distance from the 0° line and the sprinkler jets are obliquely directed backwardly
on the race. In position III, the inductors 2 have again been united up to the 180° line.
By lifting the inductors 2 after position IV, the sprinklers pivoted to the inductors are so
swivelled that the sprinkler jets are initially directed perpendicular onto the peripheral
layer and later-on, if required, even on the surface under inductors 2.
Additionally shown in the variant according to FIG. 2 is the inductor 4 for pre-heating
which is removed from this area as soon as the other two inductors 2 approach this area.
From FIG. 4ab and 4b it becomes evident how the joint heating zones (a), (c) are
enhanced if appropriate bores or grooves 6 are introduced at the peripheral rims of
race 3. i

WO 2006/087152 PCT/EP2006/001266
6
List of Reference Symbols
1 Bearing ring
2 Inductor (induction coils and/or pairs of induction coils)
3 Race of 1
4 Inductor for pre-heating
5 Sprinkler at 2
6 Bore or groove in 1

(a) Heating zone at the start
(b) Central heating zone
(c) Heating zone at the end

I Inductor position at the start of heating
II Inductor position during heating and hardening
III Inductor position at the end of heating and hardening
IV Inductor position upon the end of heating

WO 2006/087152 PCT/EP2006/001266
7
Claims:
1. A method for producing a bearing ring (1) for large-size rolling bearings
comprising at least one race (3) with a hardened peripheral layer,
wherein the peripheral layer to be hardened is exposed to the electric
field of an inductor in order to be heated and is then quenched,
characterized in that
(a) at the beginning of hardening, at least two inductors (2) are arranged
above a joint zone (a) of the annular race to be hardened and heat the
peripheral layer juxtaposed there to the hardening temperature;
(b) for heating of the subsequent central zone (b), the inductors (2) can
be moved in opposite direction along the annular race;
(c) after covering a short distance, sprinklers (5) directed onto the heated
peripheral layers are turned on and these layers are quenched,
proceeding from the center of the zone (a) heated at the beginning;
(d) the inductors (2) and sprinklers (5) are continually moved on their
ring halves until they coincide again at a zone (c) lying opposite to
the point of departure and again form a joint heating zone there;
(e) after reaching the required hardening temperature of the zone (c),
both inductors (2) are vertically lifted from the surface of the
race (3), and
(f) the sprinklers (5) are directed onto the zone (c).
(g) A method as defined in claim 1, characterized in that zone (c) is
already heated by an additional inductor (1) during heating of zones (a)
and/or zones (b).
2. A method as defined in claim 1 or 2, characterized in that according to
the inventive method axial and/or radial races (3) of a bearing ring (1)
are hardened consecutively or simultaneously.

WO 2006/087152 PCT/EP2006/001266
8
3. A method as defined at least in any one of the preceding claims,
characterized in that the sprinklers (5) are jointly moved independently
of the inductors (2) along the race (3) to be hardened.
4. A method as defined at least in any one of the preceding claims,
characterized in that the sprinkler jets are also directed onto the race
surface beneath the inductors (2).
5. A method as defined at least in any one of the preceding claims,
characterized in that the inductors (2) and/or sprinklers (5) are moved
like a pendulum when moving along the race to be hardened.
6. A method as defined at least in any one of the preceding claims,
characterized in that at the beginning (a) and/or at the end (c), radially
or axially extending bores or grooves (6) are introduced at the peripheral
rims of the race into the joint heating zones.

The invention relates to a methods for producing a bearing ring (1) for large-size rolling
bearing comprising at least one track (3) that is provided with a hardened peripheral
layer. According to said invention, the peripheral layer that is to be hardened is exposed
to the electric field of an inductor in order to be heated and is then quenched. The
invention is characterized in that a) at least two inductors (2) are disposed above a
common zone (a) of the annular track (3) that is to be hardened at the beginning of
the hardening process and said inductors (2) heat the opposite peripheral layer to a
hardening temperature there, b) the inductors (2) are moved in the opposite direction
along the annular track in order to heat the adjacent central zones (b), c) sprinklers (5)
that are directed onto the heated peripheral layers are turned on following a short
distance, and the peripheral layers are quenched starting from the center of the zone
(a) that was heated at the beginning, d) the inductors (2) and the sprinklers (5)
continue to be moved on the halves of the rings thereof until coinciding again in a zone
(c) located opposite the point of departure and forming a joint heating zone once again
there, e) both inductors (2) are lifted perpendicular to the surface of the track (3) upon
reaching the required hardening temperature, and f) the sprinklers (5) are directed onto
zone (c).

Documents:

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Patent Number

279659

Indian Patent Application Number

2292/KOLNP/2007

PG Journal Number

05/2017

Publication Date

03-Feb-2017

Grant Date

27-Jan-2017

Date of Filing

21-Jun-2007

Name of Patentee

EFD INDUCTION GMBH

Applicant Address

LEHENER STR. 91, 79106 FREIBURG

Inventors:

#	Inventor's Name	Inventor's Address
1	SPINTIG WILFRIED	KLEEFELD 60 59558 LIPPSTADT
2	STAKEMEIER, BERND	HABICHTSWEG 6 59597 ERWITTE
3	ROLLMANN, JORG	RIANTECWEG 5 59558 LIPPSTADT
4	BERGGREN KRISTIAN	S-722 31 VASTERAS

PCT International Classification Number

C21D 1/10

PCT International Application Number

PCT/EP2006/001266

PCT International Filing date

2006-02-11

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10 2005 006 701.8	2005-02-15	Germany