Title of Invention	AN IMPROVED SYSTEM FOR THE PRODUCTION OF DEFORMATION FREE BILLETS
Abstract	There is provided an improved system for the production of deformation free billets which comprises a pneumatic circuit for each strand of a multi strand casting machine, said circuit being made of i) a compressed air header provided with an air filter, a pressure regulator and a lubricator in that order in the compressed air inlet, ii) an impulse pipe connecting said air header to a solenoid operated detented valve with a manual override, iii) said impulse pipe also having a branch or loop line connected to an existing pressure regulator, iv) said existing pressure regulator having been adopted to operate an existing pneumatic cylinder for a withdrawal roll, v) the said solenoid operated detented valve with manual override having been adopted to operate an existing solenoid valve through a pressure switch, vi) the above-said existing solenoid valve having been adopted to operate the existing pneumatic cylinder for a straightening roll, and vii) the said pressure switch being adopted to be augmented by said solenoid operated detented valve with manual override. The whole system being synchronized such that the billets passing through the withdrawal and straightening rolls do not get deformed.

Title of Invention

AN IMPROVED SYSTEM FOR THE PRODUCTION OF DEFORMATION FREE BILLETS

Abstract

There is provided an improved system for the production of deformation free billets which comprises a pneumatic circuit for each strand of a multi strand casting machine, said circuit being made of i) a compressed air header provided with an air filter, a pressure regulator and a lubricator in that order in the compressed air inlet, ii) an impulse pipe connecting said air header to a solenoid operated detented valve with a manual override, iii) said impulse pipe also having a branch or loop line connected to an existing pressure regulator, iv) said existing pressure regulator having been adopted to operate an existing pneumatic cylinder for a withdrawal roll, v) the said solenoid operated detented valve with manual override having been adopted to operate an existing solenoid valve through a pressure switch, vi) the above-said existing solenoid valve having been adopted to operate the existing pneumatic cylinder for a straightening roll, and vii) the said pressure switch being adopted to be augmented by said solenoid operated detented valve with manual override. The whole system being synchronized such that the billets passing through the withdrawal and straightening rolls do not get deformed.

Full Text	INTRODUCTION TO THE FIELD OF INVENTION This invention relates to an improved system in the production of continuously cast billets. This invention more particularly, relates to 'An improved system for regulation of withdrawal & stralghtener roll pressure for ensuring proper section size of continuously cast billets'. PRIOR ART AND DRAWBACKS In the known art system in practice the hot billets pass through withdrawal and straightening rolls get deformed if the pressure is not correctly regulated. The regulated pressure has got two levels. The higher pressure (HP) is for taking in and out the dummy bar and the lower pressure (LP) is for withdrawal of hot billets. This pressure change over between HP and LP operate through 5/2 - way type solenoid based system. When the joint of dummy bar - hot billet strand joint comes near the withdrawal roll, the PLC (Programmable Logic Controller), based on the length of strand cast, generates a signal for energisation of LP solenoid coil. However due to malfunctioning to the valve, some times switch over to LP does not take place even though the said solenoid is energized and the pressure remains high. This leads to deformation of hot billets due to high pressure. The previous system does not have any provision to indicate the switchover from high to low pressure and vice-versa. OBJECTS OF THE INVENTIONS. It is therefore, a primary object of the invention to propose an improved system, which will have a pressure switch with high and low pressure contacts to obtain positive feedback of the downstream line pressure. It is another object to propose such a system, which will also have an indication panel to monitor the status of the line pressure condition as well as solenoid energisation condition to initiate corrective measure during valve malfunctioning to avoid deformation of hot billets. It is a further object of the invention to propose such a system, which will include a visual alarm in the control desk to indicate the malfunction of the valve to take quick corrective action. These and other objects of the invention will be more clearly understood from the following paragraphs. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS. Figure 1 of the accompanying drawings schematically represents a preferred pneumatic circuit diagram typical for one strand in a six strand caster while figure 2 illustrates schematic diagram for regulation of withdrawal and straightening roll pressure. It will be seen from figure 1 that while it describes only a one strand circuit, there are six such circuits for the six strand casters. All the details are therefore, similar for all the six strands. In figure 1, a 2" NB compressed air Header 10 is provided with a filter (3) pressure regulator (4) and lubricator (5). The necessary compressed air is passed through a ½" NB impulse pipe (11A) to the solenoid valve. / The pipe (11 A) also divides the compressed air and by another connector (11B) feeds the air to an existing pressure regulator (9), which acts on an existing pneumatic cylinder for withdrawal roll. The newly introduced solenoid operated detented valve with manual override operates through the pressure switch (2) the existing solenoid valve (6) which influences the existing pneumatic cylinder (8) for straightening roll. Thus the high/low pressure switch (2) is augmented by the solenoid valve (1) with manual override. It is important to note the following. 1. There are six such circuits connected to the 2" NB header in such caster in DSP. Only one such circuit is shown for clarity. 2. Identical system has been installed in both the casters. 3. All pressure switches have been installed in a separate panel for each caster. 4. Indication of High and Low pressure has been provided in a separate panel in MCD of each caster. From figure 2, the panel for a six strand caster will be clear as to how it has the change over valve panel (12) pressure switch panel (13) six strand indication panel (14) and the main control (15). The improved pressure regulation system for withdrawal and straightener rolls was designed based on factors like low pressure and high pressure requirement for rolls. Preferably a 4-way 5-ported 2-position dual solenoid operated detented type valve with manual override facility was installed. The valves are provided with manual override kit to facilitate manual change over from HP to LP and vice versa in case of malfunctioning. The pressure switches are connected to the pneumatic line downstream of the solenoid operated directional valve through isolation valve. The inlet ports for the pressure switches are ½" NB. All the pressure switches for each caster were installed in a separate panel by the side of the existing pneumatic panel. The pressure switches are having two contact points for indicating HP or LP after the solenoid valve. The indicator panel complete with all the necessary electrical accessories, one for each caster in the respective MCD, is housed with 24 nos. LED pin type indicator lamps of suitably chosen colour for indicating HP or LP of solenoid energisation condition and HP or LP condition of pressure switch contact. The control cables from each Pressure Switch Panel were terminated in the indicator panel. Each of the indicator lamps are numbered and tagged in relation to the solenoid valves for the corresponding strand in the caster for corrective action during operation. The existing MCD is having facility for indication of HP or LP of solenoid energisation condition. Necessary cable looping for these indicators were done from the existing system is placed inside the indicator panel with input and output isolators. All the pressure switch contacts to indicator lamps are through interposing relays. The interposing relays are mounted inside the indicator panel. The system went through intensive test and it was found deformation due to system problem has been completely eliminated. Fig.3 depicts 125 mm x 125 mm size billet with ±3 mm tolerance. We Claim: An improved system for the production of deformation free billets which comprises a pneumatic circuit for each strand of a multi strand casting machine, said circuit being made of i) a compressed air header provided with an air filter, a pressure regulator and a lubricator in that order in the compressed air inlet, ii) an impulse pipe connecting said air header to a solenoid operated detented valve with a manual override, iii) said impulse pipe also having a branch or loop line connected to an existing pressure regulator, iv) said existing pressure regulator having been adopted to operate an existing pneumatic cylinder for a withdrawal roll, v) the said solenoid operated detented valve with manual override having been adopted to operate an existing solenoid valve through a pressure switch, vi) the above-said existing solenoid valve having been adopted to operate the existing pneumatic cylinder for a straightening roll, and vii) the said pressure switch being adopted to be augmented by said solenoid operated detented valve with manual override. The whole system being synchronized such that the billets passing through the withdrawal and straightening rolls do not get deformed. 2. A system as claimed in Claim 1 which is provided in a continuous casting machine. 3. A system as claimed in claims 1 & 2 wherein said pressure switch is a high/ low pressure switch having high / low pressure contacts so as to obtain positive feedback of the downstream line pressure. 4. A system as claimed in claims 1 to 3 wherein there is provided an indication panel for each strand system so as to enable monitoring of the status of the line pressure condition as well as solenoid energisation condition. 5. A system as claimed in Claim 4 wherein said indication panel is associated with a pressure switch panel and a changeover valve panel. 6. A system as claimed in Claim 5 wherein the said indication panel has a main control desk and is connected to a power supply. 7. A system as claimed in claims 1 to 6 which is provided for a six strand billets casting machine thus having six such multiples of identical system associated with an indication panel in combination six high/ low air pressure switch indicator six changeover indicators associated with main indication panel depicting the said six air pressures and solenoid energisation white having a main control desk and connected to a power supply source. 8. A system for the production of deformation free billet in a single strand or multiple strand continuous casting machine substantially as herein described with reference to figures 1 and 2 of the accompanying drawings. There is provided an improved system for the production of deformation free billets which comprises a pneumatic circuit for each strand of a multi strand casting machine, said circuit being made of i) a compressed air header provided with an air filter, a pressure regulator and a lubricator in that order in the compressed air inlet, ii) an impulse pipe connecting said air header to a solenoid operated detented valve with a manual override, iii) said impulse pipe also having a branch or loop line connected to an existing pressure regulator, iv) said existing pressure regulator having been adopted to operate an existing pneumatic cylinder for a withdrawal roll, v) the said solenoid operated detented valve with manual override having been adopted to operate an existing solenoid valve through a pressure switch, vi) the above-said existing solenoid valve having been adopted to operate the existing pneumatic cylinder for a straightening roll, and vii) the said pressure switch being adopted to be augmented by said solenoid operated detented valve with manual override. The whole system being synchronized such that the billets passing through the withdrawal and straightening rolls do not get deformed.

Full Text

INTRODUCTION TO THE FIELD OF INVENTION
This invention relates to an improved system in the production of continuously cast billets.
This invention more particularly, relates to 'An improved system for regulation of withdrawal
& stralghtener roll pressure for ensuring proper section size of continuously cast billets'.
PRIOR ART AND DRAWBACKS
In the known art system in practice the hot billets pass through withdrawal and straightening rolls
get deformed if the pressure is not correctly regulated. The regulated pressure has got two levels.
The higher pressure (HP) is for taking in and out the dummy bar and the lower pressure (LP) is
for withdrawal of hot billets. This pressure change over between HP and LP operate through 5/2 -
way type solenoid based system. When the joint of dummy bar - hot billet strand joint comes
near the withdrawal roll, the PLC (Programmable Logic Controller), based on the length of strand
cast, generates a signal for energisation of LP solenoid coil. However due to malfunctioning to the
valve, some times switch over to LP does not take place even though the said solenoid is
energized and the pressure remains high. This leads to deformation of hot billets due to high
pressure. The previous system does not have any provision to indicate the switchover from high
to low pressure and vice-versa.
OBJECTS OF THE INVENTIONS.
It is therefore, a primary object of the invention to propose an improved system, which will have a
pressure switch with high and low pressure contacts to obtain positive feedback of the
downstream line pressure.
It is another object to propose such a system, which will also have an indication panel to monitor
the status of the line pressure condition as well as solenoid energisation condition to initiate
corrective measure during valve malfunctioning to avoid deformation of hot billets.
It is a further object of the invention to propose such a system, which will include a visual alarm in
the control desk to indicate the malfunction of the valve to take quick corrective action.
These and other objects of the invention will be more clearly understood from the following
paragraphs.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS.
Figure 1 of the accompanying drawings schematically represents a preferred pneumatic circuit
diagram typical for one strand in a six strand caster while figure 2 illustrates schematic diagram
for regulation of withdrawal and straightening roll pressure.
It will be seen from figure 1 that while it describes only a one strand circuit, there are six such
circuits for the six strand casters. All the details are therefore, similar for all the six strands.
In figure 1, a 2" NB compressed air Header 10 is provided with a filter (3) pressure regulator (4)
and lubricator (5).
The necessary compressed air is passed through a ½" NB impulse pipe (11A) to the solenoid
valve. /
The pipe (11 A) also divides the compressed air and by another connector (11B) feeds the air to
an existing pressure regulator (9), which acts on an existing pneumatic cylinder for withdrawal
roll.
The newly introduced solenoid operated detented valve with manual override operates through
the pressure switch (2) the existing solenoid valve (6) which influences the existing pneumatic
cylinder (8) for straightening roll.
Thus the high/low pressure switch (2) is augmented by the solenoid valve (1) with manual
override.
It is important to note the following.
1. There are six such circuits connected to the 2" NB header in such
caster in DSP. Only one such circuit is shown for clarity.
2. Identical system has been installed in both the casters.
3. All pressure switches have been installed in a separate panel for
each caster.
4. Indication of High and Low pressure has been provided in a
separate panel in MCD of each caster.
From figure 2, the panel for a six strand caster will be clear as to how it has the change over
valve panel (12) pressure switch panel (13) six strand indication panel (14) and the main control
(15).

The improved pressure regulation system for withdrawal and straightener rolls was designed
based on factors like low pressure and high pressure requirement for rolls.
Preferably a 4-way 5-ported 2-position dual solenoid operated detented type valve with manual
override facility was installed. The valves are provided with manual override kit to facilitate
manual change over from HP to LP and vice versa in case of malfunctioning.
The pressure switches are connected to the pneumatic line downstream of the solenoid operated
directional valve through isolation valve. The inlet ports for the pressure switches are ½" NB. All
the pressure switches for each caster were installed in a separate panel by the side of the
existing pneumatic panel. The pressure switches are having two contact points for indicating HP
or LP after the solenoid valve.
The indicator panel complete with all the necessary electrical accessories, one for each caster in
the respective MCD, is housed with 24 nos. LED pin type indicator lamps of suitably chosen
colour for indicating HP or LP of solenoid energisation condition and HP or LP condition of
pressure switch contact. The control cables from each Pressure Switch Panel were terminated in
the indicator panel. Each of the indicator lamps are numbered and tagged in relation to the
solenoid valves for the corresponding strand in the caster for corrective action during operation.
The existing MCD is having facility for indication of HP or LP of solenoid energisation condition.
Necessary cable looping for these indicators were done from the existing system is placed inside
the indicator panel with input and output isolators.
All the pressure switch contacts to indicator lamps are through interposing relays. The interposing
relays are mounted inside the indicator panel.
The system went through intensive test and it was found deformation due to system problem has
been completely eliminated. Fig.3 depicts 125 mm x 125 mm size billet with ±3 mm tolerance.

We Claim:
An improved system for the production of deformation free billets which comprises a pneumatic
circuit for each strand of a multi strand casting machine, said circuit being made of
i) a compressed air header provided with an air filter, a pressure regulator and a lubricator in
that order in the compressed air inlet,
ii) an impulse pipe connecting said air header to a solenoid operated detented valve with a
manual override,
iii) said impulse pipe also having a branch or loop line connected to an existing pressure
regulator,
iv) said existing pressure regulator having been adopted to operate an existing pneumatic
cylinder for a withdrawal roll,
v) the said solenoid operated detented valve with manual override having been adopted to
operate an existing solenoid valve through a pressure switch,
vi) the above-said existing solenoid valve having been adopted to operate the existing
pneumatic cylinder for a straightening roll, and
vii) the said pressure switch being adopted to be augmented by said solenoid operated detented
valve with manual override.
The whole system being synchronized such that the billets passing through the withdrawal
and straightening rolls do not get deformed.
2. A system as claimed in Claim 1 which is provided in a continuous casting machine.
3. A system as claimed in claims 1 & 2 wherein said pressure switch is a high/ low pressure
switch having high / low pressure contacts so as to obtain positive feedback of the
downstream line pressure.
4. A system as claimed in claims 1 to 3 wherein there is provided an indication panel for each
strand system so as to enable monitoring of the status of the line pressure condition as well
as solenoid energisation condition.
5. A system as claimed in Claim 4 wherein said indication panel is associated with a pressure
switch panel and a changeover valve panel.
6. A system as claimed in Claim 5 wherein the said indication panel has a main control desk
and is connected to a power supply.

7. A system as claimed in claims 1 to 6 which is provided for a six strand billets casting machine
thus having six such multiples of identical system associated with an indication panel in
combination six high/ low air pressure switch indicator six changeover indicators associated with
main indication panel depicting the said six air pressures and solenoid energisation white having
a main control desk and connected to a power supply source.
8. A system for the production of deformation free billet in a single strand or multiple strand
continuous casting machine substantially as herein described with reference to figures 1 and 2 of
the accompanying drawings.

There is provided an improved system for the production of deformation free billets which comprises
a pneumatic circuit for each strand of a multi strand casting machine, said circuit being made of
i) a compressed air header provided with an air filter, a pressure regulator and a lubricator in
that order in the compressed air inlet,
ii) an impulse pipe connecting said air header to a solenoid operated detented valve with a
manual override,
iii) said impulse pipe also having a branch or loop line connected to an existing pressure
regulator,
iv) said existing pressure regulator having been adopted to operate an existing pneumatic
cylinder for a withdrawal roll,
v) the said solenoid operated detented valve with manual override having been adopted to
operate an existing solenoid valve through a pressure switch,
vi) the above-said existing solenoid valve having been adopted to operate the existing
pneumatic cylinder for a straightening roll, and
vii) the said pressure switch being adopted to be augmented by said solenoid operated detented
valve with manual override.
The whole system being synchronized such that the billets passing through the
withdrawal and straightening rolls do not get deformed.

Documents:

333-KOL-2004-(12-07-2013)ABSTRACT.pdf

333-KOL-2004-(12-07-2013)CLAIMS.pdf

333-KOL-2004-(12-07-2013)CORRESPONDENCE.pdf

333-KOL-2004-(12-07-2013)DESCRIPTION (COMPLETE).pdf

333-KOL-2004-(12-07-2013)DRAWINGS.pdf

333-KOL-2004-(12-07-2013)FORM-1.pdf

333-KOL-2004-(12-07-2013)FORM-2.pdf

333-KOL-2004-(12-07-2013)OTHERS.pdf

333-KOL-2004-(18-01-2013)-CORRESPONDENCE.pdf

333-KOL-2004-(18-01-2013)-OTHERS.pdf

333-kol-2004-abstract.pdf

333-KOL-2004-CANCELLED PAGES.pdf

333-kol-2004-claims.pdf

333-kol-2004-correspondence.pdf

333-kol-2004-description (complete).pdf

333-kol-2004-drawings.pdf

333-kol-2004-form 1.pdf

333-kol-2004-form 13.pdf

333-kol-2004-form 2.pdf

333-kol-2004-form 26.pdf

333-kol-2004-form 3.pdf

333-kol-2004-pa.pdf

333-KOL-2004-REPLY TO EXAMINATION REPORT.pdf

333-kol-2004-specification.pdf

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Patent Number

262916

Indian Patent Application Number

333/KOL/2004

PG Journal Number

39/2014

Publication Date

26-Sep-2014

Grant Date

24-Sep-2014

Date of Filing

21-Jun-2004

Name of Patentee

STEEL AUTHORITY OF INDIA LIMITED

Applicant Address

RESEARCH & DEVELOPMENT CENTRE FOR IRON & STEEL, DORANDA, RANCHI-843001

Inventors:

#	Inventor's Name	Inventor's Address
1	CHAUDHURI SUBHASIS	RESEARCH AND DEVELOPMENT CENTRE FOR LRON AND STEEL AUTHORITY OF INDIA LTD.,DORANDA, RANCHI-834002
2	SAMBANDHAM THIRUMALAI SELVAN	RESEARCH AND DEVELOPMENT CENTRE FOR LRON AND STEEL AUTHORITY OF INDIA LTD.,DORANDA, RANCHI-834002
3	DUTTA ASIT	DURGAPUR STEEL PALNT,STEEL AUTHORITY OF INDIA LTD.,DURGAPUR-713203,STATE OF WEST BENGAL,INDIA
4	VERMA AMRESH KUMAR	RESEARCH AND DEVELOPMENT CENTRE FOR LRON AND STEEL AUTHORITY OF INDIA LTD.,DORANDA, RANCHI-834002
5	KUMAR VIKASH	RESEARCH AND DEVELOPMENT CENTRE FOR LRON AND STEEL AUTHORITY OF INDIA LTD.,DORANDA, RANCHI-834002

PCT International Classification Number

N/A

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA