US3714805A - Control system and method for concurrent automatic gage and crown control of a rolling mill - Google Patents
Control system and method for concurrent automatic gage and crown control of a rolling mill Download PDFInfo
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- US3714805A US3714805A US00197715A US3714805DA US3714805A US 3714805 A US3714805 A US 3714805A US 00197715 A US00197715 A US 00197715A US 3714805D A US3714805D A US 3714805DA US 3714805 A US3714805 A US 3714805A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
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- the rolling mill further includes roll bending apparatus whereby bending forces are applied to extended journals of the backup rolls for changing the effective roll crown at the roll gap.
- the control system provides an automatic control designed to concurrently maintain a relationship between signals generated on the basis of rolling mill measurements to control the force applicator and the roll bending device This concurrent relationship of signals equates a position change of the force applicator with the algebraic sum of signals representing roll gap changes due to a change in the rolling load and due to a change in the roll bending force, while concurrently the change in roll crown due to a change in roll bending force is equated to a rolling load change.
- the control system includes additional circuitry for an alternate form of concurrent gage and crown control.
- This invention relates to an automatic gage and crown control system for producing very accurate adjustments to the roll gap formed by a pair of rolls in a 1 DESCRIPTION OF THE PRIOR ART It is a well-known practice in the rolling mill art to provide an automatic gage control system for adjusting the gap formed by the working rolls of a rolling mill in an effort to maintain a constant delivery thickness of strip or plate while it is being processed in the rolling mill.
- One of the recent forms of automatic gage control, along with a rolling mill construction, is described in U.S. Pat. No. 3,496,743 which issued on Feb. 24, 1970.
- the delivery gage as used herein with reference to a strip or plate after passing through a rolling mill is defined as a measure of the workpiece thickness which is taken at some preselected point across the width of the workpiece, such as at an edge, at the center, or at a quarter point.
- the employment of automatic gage control has the desirable effect of maintaining a uniform delivery gage, but concurrently therewith deviations, which in certain instances are very significant, were observed in the workpiece crown, particularly when a wide strip or plate underwent a substantial thickness reduction in the rolling mil.
- the crown of the workpiece is defined to mean the thickness differential, if any, of the workpiece as measured along the lines extending across the width of the workpiece. The occurrence ofa crown in a workpiece incident to a rolling operation is a wellknown characteristic which takes place when the large rolling forces incurred produce deflection in the rolling mill rolls.
- a constant roll gap is said to be provided by maintaining the parallel force constant.
- the roll bending device has fluid actuators which are controlled in a proportionate manner by the force changes in the roll push-up fluid actuators.
- the controlling of the roll bending forces in a direct proportionate relation to changes in the push-up actuator forces, which also includes the rolling load, is considered to be insufficiently precise and accurate to provide either constant gage or desired crown of a workpiece.
- a still further object of this invention is to provide in a 4-high rolling mill including force applicator piston and cylinder assemblies for adjusting the roll gap formed between the working rolls and roll bending piston and cylinder assemblies for changing the effective crown of the working rolls, a gage and crown control system for automatically providing a signal representing a roll gap change which includes the influence on the roll gap of a concurrent and precise change in effective roll crown.
- a complete lack of crown in the workpiece may be obtained according to this control system in such instances where it is desired.
- Another object of this invention is to provide a control signal to anticipate a crown control correction included as a basis for gage control correction in an automatic control system for a rolling mill having rolling force applicators for gage control and back-up roll bending force applicators for crown control.
- FIG. 1 illustrates a 4-high plate rolling mill having a preferred construction for carrying out the features of the present invention.
- the rolling mill includes a pair of housings 11 and 12, each having a window 13 into which there is received an upper work roll 14 with the usual bearing chock assemblies 15 carried on its journals.
- a lower work roll 16 has bearing chock assemblies 17 carried on its journals by which it is located in the housing window.
- the upper work roll 14 is supported by a large diameter back-up roll 18 having bearing chock assemblies 19 arranged within the housing window.
- the lower work roll 16 is supported by a large diameter back-up roll 21 having bearing chock assemblies 22 arranged within the housing window.
- a beam 23 which extends through both housing windows in a manner that it is engaged by the back-up chocks 19.
- a screw 24 in each housing adjustably positions the beam 23 along with the back-up roll 18 and work roll 14 with respect to the lower work roll 16. This is accomplished in a conventional manner by a screwdown drive, not shown, operatively coupled to each of the screws 24 to rotate it relative to a nut 25 which is held against rotation in a recess formed in the housing. Included in each of these recesses between the nut 25 and the housing is a load cell 26, the purpose of which will be more fully explained hereinafter.
- Balance means are connected to arms 27 for urging the beam 23 upward into engagement with the lower ends of the screws 24.
- the beam 23 has projecting portions 23a which extend outward at each side of the housings where these extensions support a cylinder into which there is received a piston 29 forming a roil bending piston and cylinder assembly 30 that receives fluid under pressure through conduit lines 31.
- the forces generated by the piston and cylinder assemblies 30 are transmitted by the pistons 29 through load cells 32 to yokes 33 which have downwardly extending arms 33a in force transmitting contact with outboard bearing chock assemblies 34 that are mounted on extended journals 18a of the backup roll 18.
- the beam 23, including the projecting portions 23a serves to equilibrate the roll bending forces generated by the piston and cylinder assemblies 33 and in a manner that is independent of the housings and screwdown assemblies.
- an elongated beam 35 is arranged in the housing windows such that at the top thereof the bearing chocks 22 engage the beam, and below the beam there are arranged cylinders 36 that receive pistons 37 which will be collectively referred to as force applicator piston and cylinder assemblies 38.
- Each of the assemblies 38 is constructed and arranged in the bottom of the housing window where there is provided a conduit line 39 for transmitting fluid under pressure according to the features of the present invention.
- the beam 35 has projecting portions 350 which extend outwardly beyond each side of the housing where there are mounted load cells 41. In contact with each load cell 41 is a piston 42 received in a cylinder 43 forming a roll bending piston and cylinder assembly 44 that receives fluid under pressure through a conduit line 45.
- each roll bending piston and cylinder assembly 44 is transmitted by a yoke 46 which has upwardly extending arms 46a that engage in a force transmitting relation an outboard bearing chock assembly 47 mounted on an extended journal 21a of the back-up roll 21.
- the beam 35 serves to equilibrate the roll bending forces generated by the piston and cylinder assemblies 44 and in a manner that is independent of the housings and the piston and cylinder assemblies 38.
- FIGS. 1 and 2 attention is directed to the lower portion of the mill housings where there is formed a pair of housing projections 48 which extend toward each other in the window. Each of these projections forms a recess where there is supported a load cell 49. Below each of the load cells 49 is arranged a beam spring 51 in a manner that the spring is compressed between extensions 35b of the beam 35 and the load cell 49 in accordance with the teachings of US. Pat. No. 3,496,743.
- FIG. 2 illustrates a control system incorporating the features of the present invention wherein the electrical signals generated by the previously described load cells are shown as originating from such load cells at their respective locations at the operators side of the rolling mill. It is to be understood with respect to the drive side of the rolling mill that either a duplicate control system will be provided or, alternatively, the control system now to be described will serve the entire rolling mill stand, in which event the various corresponding load cell signals from both of the mill housing assemblies will be averaged by additional circuitry that is per se well known in the art.
- the load cell 26 provides a signal proportional to the total rolling load P encountered between the work rolls during the actual rolling operation.
- the load cell 49 develops a signal Q proportional to the difference between the load F developed by the piston and cylinder assembly 38 and the rolling load P.
- This signal Q is also known as one of the signals forming part of a force type of position transducer.
- the signal Q is employed in a proportional manner to represent a measure of the distance between the bottom of the housing window and the projection 35b of the beam 35.
- Alternate forms of position transducers known in the art, such as LVDTs, LVCTs, etc., may be employed to generate a signal Ah equivalent to AQ/M,, which will be more fully described hereinafter.
- the load cells 32 and 41 develop a signal B proportional to the roll bending force applied to the outboard bearing chocks mounted on the extended necks of the back-up rolls 18 and 21.
- the signal P provided by the load cell 26 is transmitted by a line 58 to an amplifier 59.
- the signal P is also supplied to a memory storage device 61 employed to develop a signal P which represents the rolling load developed between the work rolls at the instant the workpiece enters the roll gap and used as a lock on reference rolling load signal.
- a potentiometer 62 generates a signal P representative of a predetermined rolling load signal that may be selected by the setting of the potentiometer.
- the potentiometer 62 is connected by line 63 to one of the contacts of a manual switch 64. The other contact of the switch 64 receives the P signal delivered along line 65.
- the switch 64 shown in its normal operating position, delivers the signal P to a line 66 and, upon actuation of the switch to the phantom line position, the line 66 receives the signal P
- the line 66 is connected to the amplifier 59 and to an amplifier 67.
- the signals P and P or P depending upon the position switch 61 are combined by the amplifier 59 to derive a signal AP representative of the change in the rolling load developed between the work rolls.
- the signal AP is combined by an amplifier 68 with a signal M p generated by a potentiometer 69 to represent in a proportional manner the modulus of the rolling mill parts, which modulus is a measure of the change of roll gap due to a change in the rolling load.
- the signal M is fed over line 70 to the amplifier 68, the output of which is a signal in a line 71 proportional to the factor APIM which represents the change in the work roll gap as a function of a change in the rolling load.
- signal AP/M p is fed by line 71 to an amplifier 72 where it is combined with a signal from a variable modulus control 73 that is per se well known in the art.
- the signal APIM which may have a bias due to the control 73, is fed to an amplifier 74 where it is combined with other component control signals generated in a manner next to be described.
- the signal Q from the load cell 49 is transmitted by line 75 to an amplifier 76 and to a memory storage device 77.
- the output of the device 77 is denoted as Q, and represents a magnitude of the Q load cell signal taken at the instant the workpiece enters the roll gap and used as the lock on reference Q load cell force.
- a line 78 transmits the Q signal to an amplifier 79 where it is combined with a signal from a line 80 produced by an acceleration and deceleration signal program 81 designed to introduce a compensating factor into the control system for overcoming abnormal conditions in the rolling mill during the time when it is accelerated and decelerated from a preselected operating speed.
- the output of the amplifier 79 is fed along line 82 to the amplifier 76 from which there is derived a signal in line 83 proportional to AQ representing a change in the Q load cell reading.
- the AQ signal is fed to an amplifier 84 where it is combined with a signal M, transmitted by a line 85 from a potentiometer 86 designed to generate by a manual setting a signal proportional to the modulus of the spring 51.
- the output of the amplifier 84 is a signal representing (AQ/M Ah which is proportional to a change in distance between the beam projection 35b and the bottom of the housing window which will now be denoted as 1311. This change in distance includes any movement that may occur between the .piston 37 and cylinder 36.
- the load cells 32 and 41 each provide signals that are combined to form a signal B representative of the outboard bending force applied to the extended necks of the back-up rolls.
- the signal B is delivered by a line 87 to an amplifier 88 and also to a memory storage device 89.
- Output signal 8,, from the device 89 is produced in a line 90 and represents a measurement of the outboard bending force taken at the instant the workpiece enters the roll gap and used as the lock on reference roll bending force signal.
- the line 90 is connected to one contact of a two-position manual switch 91 which also has a contact receiving a signal B along line 92 from a manually set potentiometer 93.
- the signal fed along line 94 from switch 91 during normal rolling operations is the value 8,, as shown by the position of the switch 91, or upon actuation of the switch to the phantom line position, the line 94 receives the signal B the value of which is selected to represent a predetermined roll bending force.
- the line 94' is connected to an amplifier 95 where it is divided by a signal M received along a line 96 from a potentiometer 97.
- the signal M is manually selected to represent the modulus of the rolling mill rolls 14, 16, 18 and 21 and mill parts directly associated therewith, which modulus is a measure of the change in the effective crown of the work rolls due to a change in the outboard bending force applied to the extended necks of the back-up rolls.
- the amplifier 95 produces a signal equivalent to B /M which is connected by a line 98 to amplifiers 99 and 100.
- the amplifier 100 combines the signal (B /M with the signal B/M delivered from amplifier 88 to produce a signal in line 101 having a value proportional to AB/M B representing the change in the roll crown as a function of the change in the bending load.
- the line 101 transmits the signal AB/M to an amplifier 102 and the same signal is fed to one contact of a two-position switch 103 shown in its normal operating position.
- the signal AB/M described above is compared with a signal to be denoted as AP/M and defined as a change in the mill roll crown that will concurrently take place with a change in the rolling force.
- the signal AP/M is developed by providing a manually set potentiometer 104 for generating a signal M representing the modulus of the work rolls and the back-up rolls and mill parts directly associated therewith which modulus is a measure of a change in the effective crown of the working rolls due to a change in the rolling load P.
- the signal M is transmitted by line 105 to an amplifier 106 where it is combined with the signal P in line 58 to produce an output signal P/M in line 107.
- Amplifier 67 combines the signal M with the signal in line 66 and produces a signal P /M or Pp /M p, depending upon the position of switch 64 in a line 108.
- the line 108 is connected to an amplifier 109, the output of which is a signal AP/M p in line 110. This signal is transmitted to amplifier 102 and it is also connected to the second contact of the switch 103.
- the output from the amplifier 102 is a signal in line 111 representing the quantity to operate a servo-valve 114 according to the equation [AP/M6,; /Mmi 1 whereby a precise fluid pressure delivered from a pump, not shown, is caused to exist in conduit lines 31 and 45 to bring about the change in the bending force applied to the back-up rolls, as prescribed by this equation, to produced an exact correction to the effective crown of the work rolls that is necessary to yield the desired crown in the workpiece in a manner concurrent with a gage correction to be more fully described.
- an alternate control for the servo valve 114 is used to satisfy the equation iz ela a/ C/P) a4+ 1+ man This is accomplished by positioning the switch 112 in the phantom line position thereby interconnecting line 113 with a line 1 containing the output signal from an amplifier 116.
- the signals fed into amplifier 116 are the output signal P /M (B /M from amplifier 99 in line 117 and the output signal (C C C from an amplifier 118 in line 119.
- the output signal from amplifier 99 is derived by combining the signal P IM p from amplifier 67 and the signal B /M B from amplifier which have been formed in the previously described manner.
- the signal P IM is an initial lock-on reference signal representing an effective crown of the work rolls due to the rolling load.
- the signal B /M is an initial lock-on reference signal representing an effective crown of the work rolls due to the roll bending force produced by the piston and cylinder assemblies 30 and 44.
- the signal representing (C C C is derived from amplifier 118 which combines the signals produced by potentiometers 121, 122 and 123.
- the potentiometer 121 is set by manual adjustment to represent the amount of mechanical crown that is ground on the mill rolls, C
- the potentiometer 122 is manually set to represent the amount of thermal crown in the mill rolls that is induced as a function of the rolling operation and, particularly, the heat generated in the rolls
- the potentiometer 123 is set to represent the desired amount of crown in the plate after rolling, C
- An important aspect of the present invention is an improved automatic gage control system designed to operate on a basis which includes a recognition and compensation for the influence that a concurrent crown control correction has on the gage of the plate being rolled in the rolling mill.
- the control system illustrated in FIG. 2 includes for this purpose an amplifier 125 employed to divide the modulus signal M in line 96 by a modulus signal M delivered by a line 126 from a potentiometer 127 which is manually set to provide a signal representing the modulus of the backup rolls, the work rolls and certain other rolling mill parts, which modulus is a measure of a change in the roll gap due to a change in the roll bending force.
- Amplifier 12S produces a signal in line 128 proportional to the factor M /M Amplifier 129 multiplies this signal by the signal in a line 130 passed through the switch 103.
- the line 130 receives the signal AB/M and when the switch 103 is positioned in the phantom line position, the signal [AP/M ⁇ [M ,,,/M is transmitted by line 130.
- the output from amplifier 129 in the preferred mode is a signal AB/M B which is proportional to a change in the work roll gap due to a change in the roll bending force.
- the signal AB/M is transmitted by line 131 to amplifier 132, which also receives the previously described signal AQ/M, from amplifier 84.
- the output from amplifier 132 is a signalrepresenting AQ/M, AB/M which is transmitted by a line 133 to the previously described amplifier 74 where it is combined with the signal AP/M to provide a control signal in line 134 for the operation of a servo-valve 135 according to the relationship-
- the servo-valve 135 controls the fluid delivered. by a pump, not shown, in conduit line 39'to the force applicator piston and cylinder assemblies 38.
- Equation 2 describes the relationship that, as the rolling pressure P increases, the rolls will bend more and, hence, the resulting crown on the plate will be greater; as the back-up roll bending forces are increased, the resulting plate crown will decrease; and the greater the mechanically ground crown on the rolls and/or the greater the thermally induced crown, the resulting crown in the plate will be reduced.
- Equations 10 and ll therefore, set down the force change relationships that must be maintained concurrently during rolling operation.
- the interrelations between the changes in P, Q and B forces, given as AP, AQ, and AB, must be rapidly and continuously controlled and maintained to produce the high-grade plate product desired, namely, one having constant gage and constant crown end to end, including the possible condition of zero crown in product.
- Equation 12 a change in the roll gap due to a change in the rolling load AG
- a change in the roll gap due to a position change of said force applicator piston and cylinder means AC a change in the roll gap due to a change in the roll bending force
- equation 13 AC a change in the effective crown of the working rolls due to a change in the rolling load
- the immediate action of the control circuits will be to concurrently introduce oil into the force applicator piston and cylinder assemblies 38 and into the piston and cylinder assemblies and 44 of the back-up roll bending system in response to required increases in the Q load cell forces and in the B load cell forces, respectively, which, in turn, will result in further increases in P load cell force.
- the resulting increases AP, AQ, AB will be so controlled as to satisfy equations 10 and 11 concurrently, which are given in lines 134 and 113, respectively, of FIG. 2.
- the concurrent gage and crown control for a rolling mill according to the present invention may be further illustrated by the following example.
- the values of the moduli for this mill are:
- the nominal or lock-on reference rolling load P may be assumed to have a value of 7,000,000 pounds.
- the various crowns over the plate width are as follows:
- An alternate method of control is to anticipate the effect of a change in the bending force AB on the gage of the plate by feeding a second AP signal directly into the amplifier 129, which signal is related to the AB signal by the form of a signal [AP/M ][M /M when the switch 103 is actuated to the phantom line position, and is the equivalent of AB/M
- a second AP signal directly into the amplifier 129
- [AP/M ][M /M when the switch 103 is actuated to the phantom line position is the equivalent of AB/M
- equations 1 and 2 may be rewritten in terms of additional and/or other forces developed within a given rolling mill construction. Thus, for example, let us consider an assumed mill construction which does not include the reaction beam extensions 23a and 35a, shown in FIG.
- a method of automatically controlling the delivery thickness and crown of a workpiece undergoing a thickness reduction in a rolling mill wherein, as incident to which the crown and thickness of the delivery workpiece normally change due to nonuniform characteristics of the entering workpiece, such as a change in the entry thickness, in the metallurgical composition,
- the rolling mill structure which includes a pair of working rolls supported in a mill housing having force applicator means for adjusting under the rolling load the gap formed between said rolls, said rolling mill further including roll bending means for exerting a roll bending force to change the effective crown of said working rolls, said method comprising the steps of:
- a method of automatically controlling the delivery thickness and crown of a workpiece undergoing a thickness reduction in a rolling mill wherein, as incident to which the crown and thickness of the delivery workpiece normally change due to nonuniform characteristics of the entering workpiece, such as a change in the entry thickness, in the metallurgical composition, and in the workpiece crown, thereby producing changes in the elastic deformation of the rolling mill structure which includes a pair of working rolls supported in a mill housing having force applicator means for adjusting under the rolling load the gap formed between said rolls, said rolling mill further including roll bending means for exerting a roll bending force to change the effective crown of said working rolls, said method comprising the steps of:
- a methodof automaticallycontrolling the delivery H thickness and crown of a workpiece undergoing a thickness reduction in a rolling mill wherein, as incident to which the crown and thickness of the delivery workpiece normally change due to nonuniform characteristics of the entering workpiece, such as a change in the entry thickness, in the metallurgical composition and in the workpiece crown, thereby producing changes in the elastic deformation of the rolling mill structure, which includes a pair of working rolls, each of which are supported by a back-up roll in a mill housing having force applicator means for adjusting under the rolling load the gap formed between said working rolls, said rolling mill further including roll bending piston and cylinder means for exerting a roll bending force to apply bending moments to extended journals of the back-up rolls for changing the effective crown of said working rolls, said method comprising the steps of: generating a plurality of signals resulting from said nonuniform characteristics of the entering workpiece, from changes in said force applicator means, and from changes in said roll bending piston and cylinder means,
- a change in the roll gap due to a change in the rolling load AC a change in the roll gap due to a position change of said force applicator means AC a change in the roll gap due to a change in the roll bending force AC, a change in the effective roll crown due to a change in the rolling load AC a change in the effective roll crown due to a change in the roll bending force.
- a method of automatically controlling the delivery thickness and crown of a workpiece undergoing a thickness reduction in a rolling mill wherein, as incident to which the crown and thickness of the delivery workpiece normally change due to nonuniform characteristics of the entering workpiece, such as a change in the entry thickness, in the metallurgical composition, and in the workpiece crown, thereby producing changes in the elastic deformation of the rolling mill structure, which includes a pair of working rolls, each of which are supported by a back-up roll in a mill housing having force applicator piston and cylinder means for adjusting under the rolling load the gap formed between said working rolls, position transducer means for sensing change of said force applicator piston and cylinder means, said rolling mill further including roll bending piston and cylinder means for exerting a roll bending force to apply bending moments to extended journals of the back-up rolls for changing the effective crown of said working rolls, said method comprising the steps of:
- a method of automatically controlling the delivery thickness and crown of a workpiece undergoing a thickness reduction in a rolling mill according to claim 4 comprising the additional steps of:
- a method of concurrently controlling the delivery thickness and crown of a workpiece while it is being processed in a rolling mill which includes a pair of working rolls supported in a mill housing having force applicator means for adjusting under the rolling load the gap formed between said rolls, said rolling mill further including means for exerting a roll bending force to change the effective crown of said working rolls, said method comprising the steps of:
- a method of concurrently controlling the delivery thickness and crown of a workpiecewhile it is being processed in a rolling mill which includes a pair of working rolls supported in a mill housing having force applicator means for adjusting under the rolling load the gap formed between said rolls, said rolling mill further including means for exerting a roll bending force to change the effective crown of said working rolls, said method comprising the steps of:
- a method of concurrently controlling the delivery thickness and crown of a workpiece while it is being processed in a rolling mill which includes a pair of working rolls, each of which are supported by a backup roll in a mill housing force applicator piston and cylinder means for adjusting under the rolling load the gap formed between said working rolls, said rolling mill further including roll bending piston and cylinder assemblies for exerting a roll bending force to apply bending moments to extended journals of the back-up rolls for changing the effective crown of said working rolls, said method comprising the steps of:
- An automatic control system for accurate concurrent control of the delivery thickness and crown of a workpiece undergoing a thickness reduction in a rolling mill wherein, as incident to which the crown and thickness of the delivery workpiece normally change due to nonuniform characteristics of the enteringworkpiece, such as a change in the entry thickness, in the metallurgical composition, and in the workpiece crown, thereby producing changes in the elastic deformation of the rolling mill structure which includes a pair of working rolls supported in a mill housing having force applicator means for adjusting under the rolling load the gap formed between said rolls, said rolling mill further including roll bending means for exerting a roll bending force to change the effective crown of said working rolls, said control system comprising: means for generating a plurality of signals resulting from said nonuniform characteristics of the entering workpiece, from changes in said force applicator means, and from changes in said roll bending means,
- control means associated with said force applicator means and said roll bending means formaintaining said concurrent interrelationships between said signals to yield a constant thickness and crown of a workpiece delivered from said rolling mill.
- a rolling mill or the like apparatus having a housing for supporting a pair of processing rolls forming a roll gap which is subject to thickness and deflection variations due to the forces developed between the rolls during the processing of a workpiece, said rolling mill further including: 7
- roll bending means for exerting roll bending forces to change the effective crown of said processing rolls
- control including means for generating a first signal representing a change in the roll gap due toa change in the rolling load
- said position transducer means includes a load cell and spring assembly for detecting a displacement of said force applicator means.
- a back-up roll including extended journals for supporting each of said processing rolls
- outboard bearing chocks mounted on said extended journals in a force transmitting relationship with said roll bending means for applying bending moments to said backup roll to change the effective crown of the processing roll supported thereby.
- said rolling mill further comprises a beam member for each of said back-up rolls constructed and arranged to equilibrate said roll bending forces in a manner independent of said force applicator means.
- a rolling mill or the like apparatus further comprising means for combining said first, second and third signals according to the first expression wherein said first control means reduces said first expression to zero and where said first signal represents AP/M said second signal represents AQ/M and said third signal represents AB/M and where AP a change in the rolling load M the modulus of the rolling mill parts, which modulus is a measure of the change in the roll gap due to a change in the rolling load AQ a change in the load acting on said position transducer means M, modulus of said spring of said position transducer means AB a change in said roll bending force M modulus of said processing and back-up rolls and associated mill parts which modulus is a measure of a change in the roll gap due to a change in said roll bending force.
- switching means operatively arranged for feeding said sixth signal to said second control means during a momentary period of tie when the workpiece first enter the rolling mill.
- a rolling mill or the like apparatus having a housing for supporting a pair of processing rolls forming a roll gap which is subject to thickness and deflection variations due to the forces developed between the rolls during the processing of a workpiece, said rolling mill further including:
- roll bending means for exerting roll bending forces to change the effective crown of said processing rolls
- control including means for generating a first signal representing a change in the roll gap and due to a change in he rolling load in which includes the influence of said roll bending force
- a'tirst control means associated with said force applicator means for maintaining a predetermined relationship between said first and second signals
- a second control means associated with said roll bending means for maintaining a predetermined relationship between said third and fourth signals.
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Abstract
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Applications Claiming Priority (1)
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US19771571A | 1971-11-11 | 1971-11-11 |
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US3714805A true US3714805A (en) | 1973-02-06 |
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US00197715A Expired - Lifetime US3714805A (en) | 1971-11-11 | 1971-11-11 | Control system and method for concurrent automatic gage and crown control of a rolling mill |
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US (1) | US3714805A (en) |
CA (1) | CA994453A (en) |
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Cited By (13)
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US3793859A (en) * | 1972-05-10 | 1974-02-26 | Westinghouse Electric Corp | Method and apparatus for controlling crown in a plate rolling mill |
US3803886A (en) * | 1972-05-10 | 1974-04-16 | Westinghouse Electric Corp | System and method for controlling gauge and crown in a plate rolling mill |
USB341579I5 (en) * | 1972-03-28 | 1975-01-28 | ||
US3938360A (en) * | 1973-05-02 | 1976-02-17 | Hitachi, Ltd. | Shape control method and system for a rolling mill |
US3958435A (en) * | 1974-06-01 | 1976-05-25 | Nippon Steel Corporation | Method for controlling the profile of workpieces on rolling mills |
US4054043A (en) * | 1976-12-02 | 1977-10-18 | Blaw-Knox Foundry & Mill Machinery, Inc. | Closed loop integrated gauge and crown control for rolling mills |
US4137741A (en) * | 1977-12-22 | 1979-02-06 | General Electric Company | Workpiece shape control |
US4513594A (en) * | 1983-08-22 | 1985-04-30 | Tippins Machinery Company, Inc. | Method and apparatus for combining automatic gauge control and strip profile control |
EP0349885A2 (en) * | 1988-07-08 | 1990-01-10 | Betriebsforschungsinstitut VDEh Institut für angewandte Forschung GmbH | Method for cold-rolling sheets and bands |
US20080098590A1 (en) * | 2005-01-25 | 2008-05-01 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Facility For Forming Cell Electrode Plate |
US20110321012A1 (en) * | 2010-06-25 | 2011-12-29 | International Business Machines Corporation | Non-Intrusive Measurement of Content Quality Using Dry Runs with Roll-back |
CN102861771A (en) * | 2012-09-29 | 2013-01-09 | 鞍钢股份有限公司 | Working roll differential roll bending method for controlling asymmetric plate shape defects |
CN105436209A (en) * | 2014-09-28 | 2016-03-30 | 宝山钢铁股份有限公司 | Unilateral thickness control method of heavy and medium plate mill |
Families Citing this family (1)
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---|---|---|---|---|
CN103785693B (en) * | 2013-12-30 | 2015-08-26 | 秦皇岛首秦金属材料有限公司 | A kind of cut deal board-shape control method controlled based on strip crown |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3394566A (en) * | 1964-10-08 | 1968-07-30 | United Eng Foundry Co | Correction of roll positioning in a rolling mill |
US3518858A (en) * | 1966-11-30 | 1970-07-07 | Nippon Kokan Kk | Method of continuously controlling the correcting apparatus for workpiece shape during rolling |
US3534571A (en) * | 1968-03-14 | 1970-10-20 | Alcan Res & Dev | Rolling mill control |
US3620058A (en) * | 1967-12-04 | 1971-11-16 | British Iron Steel Research | Hot or cold rolling of strip or plate |
-
1971
- 1971-11-11 US US00197715A patent/US3714805A/en not_active Expired - Lifetime
-
1972
- 1972-11-02 DE DE2253524A patent/DE2253524A1/en active Pending
- 1972-11-03 CA CA155,488A patent/CA994453A/en not_active Expired
- 1972-11-03 GB GB5083372A patent/GB1416175A/en not_active Expired
- 1972-11-03 ES ES408244A patent/ES408244A1/en not_active Expired
- 1972-11-10 FR FR7239878A patent/FR2161952B1/fr not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3394566A (en) * | 1964-10-08 | 1968-07-30 | United Eng Foundry Co | Correction of roll positioning in a rolling mill |
US3518858A (en) * | 1966-11-30 | 1970-07-07 | Nippon Kokan Kk | Method of continuously controlling the correcting apparatus for workpiece shape during rolling |
US3620058A (en) * | 1967-12-04 | 1971-11-16 | British Iron Steel Research | Hot or cold rolling of strip or plate |
US3534571A (en) * | 1968-03-14 | 1970-10-20 | Alcan Res & Dev | Rolling mill control |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USB341579I5 (en) * | 1972-03-28 | 1975-01-28 | ||
US3913363A (en) * | 1972-03-28 | 1975-10-21 | Nippon Kokan Kk | Method and apparatus for shape control of metal products in continuous rolling mill |
US3793859A (en) * | 1972-05-10 | 1974-02-26 | Westinghouse Electric Corp | Method and apparatus for controlling crown in a plate rolling mill |
US3803886A (en) * | 1972-05-10 | 1974-04-16 | Westinghouse Electric Corp | System and method for controlling gauge and crown in a plate rolling mill |
US3938360A (en) * | 1973-05-02 | 1976-02-17 | Hitachi, Ltd. | Shape control method and system for a rolling mill |
US3958435A (en) * | 1974-06-01 | 1976-05-25 | Nippon Steel Corporation | Method for controlling the profile of workpieces on rolling mills |
US4054043A (en) * | 1976-12-02 | 1977-10-18 | Blaw-Knox Foundry & Mill Machinery, Inc. | Closed loop integrated gauge and crown control for rolling mills |
US4137741A (en) * | 1977-12-22 | 1979-02-06 | General Electric Company | Workpiece shape control |
US4513594A (en) * | 1983-08-22 | 1985-04-30 | Tippins Machinery Company, Inc. | Method and apparatus for combining automatic gauge control and strip profile control |
EP0349885A2 (en) * | 1988-07-08 | 1990-01-10 | Betriebsforschungsinstitut VDEh Institut für angewandte Forschung GmbH | Method for cold-rolling sheets and bands |
US4981028A (en) * | 1988-07-08 | 1991-01-01 | Betriebsforschungsinstitut Vdeh | Method for cold-rolling sheets and strips |
EP0349885A3 (en) * | 1988-07-08 | 1991-11-13 | Betriebsforschungsinstitut VDEh Institut für angewandte Forschung GmbH | Method for cold-rolling sheets and bands |
US20080098590A1 (en) * | 2005-01-25 | 2008-05-01 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Facility For Forming Cell Electrode Plate |
US7967594B2 (en) * | 2005-01-25 | 2011-06-28 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Facility for forming cell electrode plate |
US20110321012A1 (en) * | 2010-06-25 | 2011-12-29 | International Business Machines Corporation | Non-Intrusive Measurement of Content Quality Using Dry Runs with Roll-back |
US9092576B2 (en) * | 2010-06-25 | 2015-07-28 | International Business Machines Corporation | Non-intrusive measurement of content quality using dry runs with roll-back |
CN102861771A (en) * | 2012-09-29 | 2013-01-09 | 鞍钢股份有限公司 | Working roll differential roll bending method for controlling asymmetric plate shape defects |
CN102861771B (en) * | 2012-09-29 | 2014-11-05 | 鞍钢股份有限公司 | Working roll differential roll bending method for controlling asymmetric plate shape defects |
CN105436209A (en) * | 2014-09-28 | 2016-03-30 | 宝山钢铁股份有限公司 | Unilateral thickness control method of heavy and medium plate mill |
Also Published As
Publication number | Publication date |
---|---|
ES408244A1 (en) | 1976-10-16 |
CA994453A (en) | 1976-08-03 |
FR2161952B1 (en) | 1976-04-23 |
FR2161952A1 (en) | 1973-07-13 |
DE2253524A1 (en) | 1973-05-17 |
GB1416175A (en) | 1975-12-03 |
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