CA1111638A - Rolling mill gauge and flatness calibration system - Google Patents
Rolling mill gauge and flatness calibration systemInfo
- Publication number
- CA1111638A CA1111638A CA317,679A CA317679A CA1111638A CA 1111638 A CA1111638 A CA 1111638A CA 317679 A CA317679 A CA 317679A CA 1111638 A CA1111638 A CA 1111638A
- Authority
- CA
- Canada
- Prior art keywords
- transducer
- signal
- rolling
- rolls
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
- B21B38/105—Calibrating or presetting roll-gap
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
ABSTRACT
A frame carrying one or more transducers is inserted between the work rolls of a mill stand with the transducers positioned parallel to the roll axis. The outputs of the transducers are connected to a display device which when load is applied to the rolls displays the several output signals side-by-side so that variation in loading lengthwise of the rolls is made visible. The outputs of the transducers may also be interconnected with automatic gauge and crown control circuits so as to calibrate those circuits.
A frame carrying one or more transducers is inserted between the work rolls of a mill stand with the transducers positioned parallel to the roll axis. The outputs of the transducers are connected to a display device which when load is applied to the rolls displays the several output signals side-by-side so that variation in loading lengthwise of the rolls is made visible. The outputs of the transducers may also be interconnected with automatic gauge and crown control circuits so as to calibrate those circuits.
Description
This invention rela-tes to mill stands. It is more particularly concerned with method and apparatus for calibrating a stand both with respect to gauge and to flatness of product.
The invention is particularly well adapted ~or use with mill stands provided with the closed loop integrated gauge and crown control. Such equipment is disclosed in United States Patent 4,054,043 of Werner W. Eibe, issued October 18, 1977.
In flat product mills for hot rolled plate and strip as well as for cold rolled strip, the dimensional quality of the produc~ depends on the accuracy of the roll gap between the work rolls. Gauge is normally controlled by automatic gauge control systems and the shape by separate roll crown control systems, The most effective variable crown control system is obtained by counter bending the mill rolls opposite their deflection due to rolling forces. As far as crowning the rolls is concernedr it has always been difficult to know that the rolls are absolutely flat so that the product is also flat across its width. With thin strip the flatness is mostly controlled by the operatoris observation of buckles somewhere across the width.
Automatic devices have been conceived that measure the flatness behind the mill, then make corrections to the roll bending cylinders. In heavy plate rolling the shape can only be esta-blished after the finishing pass by measuring the crown. In all these cases it is an after-the-fact measurement and feedback to the control system often resulting in out-of-tolerance non-saleable material.
With regard to automatic gauge control, load cells have been placed underneath the mill screws or the hydraulic piston in case of hydraulic roll adjustment. Thei zeroing and s ~
q ~ ~
levelling of the automatic gauge control system is normally done by facing the slowly rotating work rolls under enough pressure so that all the a~fected mill stand components are stretched or compressed sufficien~ly to have a more or less linear spring characteristic from there on. During this proce-dure the work and back-up rolls would deflect due to roll bend-ing, shear and ~lattening. In the present state of the art, these sizeable deflections had to be neglected during the calibratlon procedure. Only after the product was rolled the shape problems became obvious and could only then be corrected by manual or automatic control of the roll bending system.
It is an object of the invention to provide method and apparatus for calibrating the roll gap in a mill stand both for gauge and for shape flatness. It is ano-ther object to utilize for that purpose electric or hydraulic transducers to measure the pressure across the face of a roll in a mill stand and so make possible the gap calibration. It i5 another object to utilize -the signals from those transducers for actuating a visible display. It is still another object to use those signals as additional inputs into the gauge and control system of a suitable mill control system.
The apparatus of the invention comprises a frame carrying one or more transducers, the frame being dimensioned so that it can be inserted between work rolls of a mill stand with the transducers positioned parallel to the roll axis. The outputs of the transducers are connected to a display device which, when load is applied, displays the several output signals side-by-side so that variation in loading ]engthwise of the rolls is made visible. Those outputs are proportional to the width of the roll gap at the positions of the respec-tive transducers.
3~
The outpu~s of at least the center transdu~er and ~ho ~wo transducers adjacent the ends of a roll are also interconnected into ~he gauge and crown control circuits of a mill con~rol sys~em so that th~se circuits can be calibrated against the actual dimensions of the roll gap.
Thus, in accordance with one broad aspect of the invention, there is provided apparatus for calibrating the gap betwcen work rolls of a rolling mill stand comprising transducer m~ans for converting the width of gap into a signal, frame means for mounting said transducer means, said rame means being dimensioned for passage as a uni~ through the gap between work rolls and ex-tending lengthwise of ~hose rolls so as to bring said transducer means againstthe work rolls at their line of cantact in load transmitting relation there-between and for removal therefrom, and means for cond~cting *he signals from said transducer means out of the gap.
According to another aspect of the invention ~here is provided the method of calibrating for optimum flatness of the product a rolling mill stand provided with pressure means for varying the crown of a work roll comprising positioning in the hite of the work rolls transducer means adapted to convert the wid~h of the gap into a signal, applying pressure to the work rolls, in-dicating the signal from a transducer adjacent a work roll neck, appl~ing crowning pressure to the work ~oll, indicating the signal f~om a transducer centrally located along the roll, and adjusting those pressures until those signals are equal.
In accordance with another aspect of the invention there is provided the method of calibrating for optimum flatness of product a rolling mill stand provided with pressure means for varying the crown of a work roll comprising measuring the separation between work roll necks, converting that measure-ment.to a gauge signal, determining ~he inclination o a work roll axis ~o the horizontal, converting that determination to a crown signal, positioning in the bite of the work rolls transducer means adapted to convert th~ width of gap into a signal, applying crowning pressure to the work rolls correspond-ing to a crowning pressure ~i~nal comprlsing the algebraic sum of the crown 3.
3~
signal and the signal from a centrally loca~ed transducer~ and applying rolling pressure to the work rolls correspon~ing to a rolling pressure signal comprising the algebra.ic sum of the gauge signal and the signal from a transducer adjaccnt a roll neck, and adju~ting those pressures until the crowning pressure signal is e~ual to the rolling pressure signal.
Embodimcnts of the invenkion presently preferred are illus~rated in the attached drawings, to which reference is now made.
Figure 1 is. a vertical cro~s-section of a portion of mill stand perpendicular to the roll axis showing a f~rst cmbodiment of the apparatus in place between the work rolls;
Figure 2 is a plan of the apparatus.shown in Figure l;
Figure 3 is.a cross-~ection of th~ apparatus taken on the plane III-III of Figure l;
Figure 4 is a horizontal cro~s-sec~ion through a mill stand between the work rolls!showing in plan a second embodiment of the apparatus in place;
Figure 5 is~ an elevation of the apparatus of Fi.gure 4;
Pigure 6 is an end elevation of the apparatus of Figures 4 and 5f Figure 7 is.an enlarged cross-section through the apparatus of Figure 4 taken on the~plane VII-VII ~hereof;
Figure 8 i~ a schematic arrangemen~ o the invention in a 4-high mill s.tand interconnected with one embodiment o gauge and crown control apparatus.; and Figure 9 is a schematic arrangement of the .invention in a 4-high mill stand interconnected with another embodimcnt of gauge and crown control apparatus.
The firs.t embodiment of the apparatu~ shown in Figures 1, 2 and 3 compri`ses a rectangular frame 11 hàving 3~.
~ ~33 parallel side pieces 12 and cross pieces 13 a~ each end of ~hose side pieces. Intermediate cross pieces 13 is a pair of spaced-apart cross pieces 14 between whlch are positioned a central transducer 15, transducers 17 at each end of cross pieces 14 and transducers 16 intermediate the central transducer 15 and t~ansducer 17 on each slde. The leads from the various transducers, which conveniently take the form of load cells, are brought out in cable 19 at one end of frame 11. The height of side pieces 12 and cross pieces 13 and 14 is slightly less than the unloaded height of the load cells.
As may be seen in Figures 8 and 9, the apparatus also comprises display means 24 having a central scale 25, scales 27, one at each end, and scales 26 intermediate scales 25 and 27.
The positions of those scales correspond respectively to the positions of load cells 15, 16 and 17 lengthwise of the rolls.
Central load cell 15 is connected to means 24 so as to actuate a pointer which moves vertically on scale 25, through conductors 29, 153, 157 and crown calibrate conditioner 32. End load cells 17 are connected to scales 27 respectively through conductors 31, 155, 160 and gauge calibrate conditioners 33. Intermediate load cells 16 are connected to scales 26 through conductors 30.
Figures 8 and 9 show the electrical connections for one side only of the mill stand and it will be understood that duplicate circuits are provided for the other side of the mill stand.
In use, frame 11 is inserted between lower work roll 119 and upper work roll 118 of a mill stand 110, those rolls, of course bein'g separated to allow frame 11 to en-ter. Frame 11 is rolled in on table rolls 22 on each side oE the mill stand.
Frame 11 is positioned so that its load cells lie in a ver-tical plane through the axis of work rolls 118 and 119, and the rolls 3~
of the mill stand are then brought together against the load cells.
For any given rolling force corresponding to a given gauge of ~inished product, the stand can be adjusted to sub-stantial flatnes~ by regulating the crowning force while the apparatus 11 is in the bite of work rolls 11~ and 119 until the pointers of scales 25, 26 and 27 are brought to substantially the same position. In the embodiment of the display device 24 illustrated, the scales 25, 26 and 27 are vertical and their pointers extend horizontally across them so that when the pointers are brought to the same position they form a horizontal line across the scales. The sources o~ rolling ~orce are then calibrated as are the sources o~ crowning force, so that after the apparatus 11 has been removed from the rolls, the stand can be set up to roll flat material of the desired gauge.
In Figure 8 the apparatus is shown interconnected with gauge and crown control apparatus. A mill stand suitable for the invention comprises an operator's side housing 110 and a drive side housing 111 tied together at top and bottom in con-ventional fashion. Each housing is formed with a conventionalwindow, within which windows are positioned upper backup rolls chocks 112, lower backup roll chocks 113, and, between them, upper work roll chocks 114 and lower work roll chocks 115.
Upper backup roll 116 is journalled in chocks 112, lower backup roll 117 is journalled in chocks 113, upper work roll 118 is journalled in chocks 114 and lower work roll 119 is journalled in chocks 115. ~ hydraulic cylinder 108 with piston 109 is positioned between the top of housing 110 and chock 112 and a like cylinder and piston is positioned in the same way in hous-ing 111. Chocks 113 rest on the bottom of housings 110 and 111.
, Between chocks 114 and 115 in housing 110 ls posi-tioned a pair of hydraulic roll-bending cylinders 123, one on each side of the roll neck. A like pair is positioned in the same location in housing 111. Centrally located within each cylinder 123, is a transducer 124. Work rolls 118 and 119 are provided with elongated necks 125 and 126 respectively which extend through the window in housing 110. Between the outer ends of necks 125 and 126 is fixed a transducer 127. Transducers 124 and 127 are pre~erably mounted to act directly between the upper and lower roll chocks and generate an electrical signal corresponding to movement between the upper and lower roll chocks.
Hydraulic fluid is supplied to pressure cylinders 108 through conduits 120 and 128 from servo valve~29. The latter is furnished hydraulic fluid through conduit 130 from pump 131 which is driven by motor 132~ Pump 131 pumps hydraulic fluid from tank 107 and servo valve 129 discharges into thattank through conduit 133. In like manner, roll bending cylinders 123 are supplied wi-th hydraulic fluid through conduits 121 and 135 from servo valve 136. That valve is furnished hydraulic fluid through conduit 137 from pump 138 which is driven by motor 139.
Pump 138 pumps hydraulic fluid from tank 107 and ser~o valve 136 discharges into that tank through conduit 140.
The electrical output of transducer 127 is connected by conductor 142 to the input of crown signal conditioner 143.
The output of conditioner 143 is connected by conductor 144 to summing junction 145. The electrical output of transducers 124 is averaged and is then connected to gauge siynal conditioner 148 by conduc-tor 147. The output of conditioner 148 is connected to summing junction 145 by conductor 149 and to summing junction 6.
151 by conductor 150. Conditioners 1~3 and 148 are conventional and may include amplifiers, signal shapiny elements and the like.
Crown input command 152 is connected by conductor 153 to summing junction 145. Gauge input command 154 is connected by conductor 155 to summing junction 151. Those commands furnish signals which can be adjusted to correspond to the desired crown and gauge respectively and incorporate read-outs of those values.
Summing junction 145 is connected by conductor 157 to the inputs of gauge servo amplifier 158 and cxown servo amplifier 159.
Summing junction 151 is connected by conductor 160 to the input of gauge servo amplifler 158. The output of that amplifier is connected by conductor 161 to servo valve 129 and the output of crown servo amplifier 159 is connected by conductor 162 to servo valve 136.
We have specifically described above the connections for the apparatus as applied to housing 110 on the operator's side of the mill stand. That apparatus is duplicated on the drive side of the mill stand, with -the exception of transducer 127, and is connected to control apparatus in the same way as has been described for the operator's side of the mill stand.
A transducer identical to 127 would have to be located between the drive spindles for the work rolls 118 and 119, which pre-sents di~ficulties. We find that transducer 127 is adequate to furnish signals to both sides as long as the work is reasonably well centered in the rolls of the mill stand.
The operation of the apparatus of Figure 8 will now be described without reference to the calibrating apparatus shown in Figures 1-3. The following description assumes that there is metal in the stand to be rolled.
Crown signal conditioner 1~3 and gauge signal - - `
:
conditioner 148 are adjusted so that their outputs a~e of opposite polarity. The signals generated by transducer.s 127 and 124 and appearing on conductors ].44 and 149 respectively are brought to summing junction 145 and are there compared with the signal on conductor 153 from crown input command 152.
The bending of the work roll necks 125 and 126 toward each other about the fulcrum at the roll midpoint caused by the application of rolling pressure on those roll necks is counter-balanced by bending the work rolls in the opposite direction about the same fulcrum by bending cylinders 123. The amount of this bending is i.nitially set by adjusting the crown input command 152. Should the material entering the mill display changes in hardness, flatness or gauye, an error signal will appear on conductor 157. That error signal is applied both to crown servo amplifier 159 and gauge servo amplifier 158, so that working pressure cylinders 108 increase or decrease their force by an incremental amount and bending cylinders 123 increase or decrease their force by the same incremental amount but in the opposite direction. Thus, the sum of the vertically acting forces on housings 110 and 111 remains unchanged, and there is no change in the gauge of the work being rolled. However, the bending moment exerted on work rolls 118 and 119 is changed by the product of the change in force of bending cylinders 124 multiplied by their lever arm, the distance between the fulcrum and cylinders 123 or any distance along the face of the backup roll toward the edges.
Therefore, the flatness of the work is preserved.
The gauge desired is initially set by adjustment of gauge input command 154. The signal from transducer 124 through gauge signal conditioner 148 is summed with the 8.
3;~
reference signal from gauge inpu-t com~,and 154 in summing junc-tion 151 and the error signal resulting is applied to gauge servo amplifier 158. In response thereto, servo valve 129 adjusts the fluid pressure in pressure cylinder 108 so as to change the roll gap and thus the signal generated by transducer 124 in the direction to bring the error signal to zero.
The appara~us, as has been mentioned, calibrates the control apparatus above described. Callbrating apparatus 11 is inserted ln the bite of rolls 118 and 119. The signal from centrally located load cell 15 is passed through crown calibra-tor conditioner 32 to summing junction 145, the output of whlch on conductor 157 is displayed on scale 25 of display means 24, as well as belng introduced lnto ampllflers 158 and 159. The signals from outer load cells 17 are passed through calibrator conditioners 33 to summing junctions 151, the outputs of which on conductors 160 are displayed on scales 27 of display means 24, as well as being lntroduced into ampliflers 158. If the outputs of load cells 17 are not equal, the servo ampliflers 158 on opposite side of the mill stand will adjust pressure cylinders 108 to equalize those outputs and that equalization will be made vlslble by display means 24. If the equallzed outputs of cells 17 are different from the output of cell 15, the signal from that latter cell will actuate servo ampliflers 158 and 159 and the pressure ln roll bendlng cylinders 123 will be adjusted to bring those outputs to the same level.
Figure 9 hereln illustrates the calibrating apparatus lnterconnected with another embodiment gauge and crown control apparatus. The only differences between Figures 8 and 9 are those between the two embodiments of the gauge and crown control apparatus. In the embodiment shown in E'igure 8, the work roll L a~3~
crowning is effected by bending the work rolls by cyli~ders 123.
In the second embodiment shown in Figure 9, the work roll crown-ing is effected by adjustable crown backup rolls 176 and 177.
The interconnection of the calibxation apparatus wlth the con-trol apparatus is the same ~or both embodiments. It is not, therefore, believed to be necessary to repeat the full descrip-tion of the second embodiment of the gauge and crown control apparatus nor the description of the interconnections with it of the calibrating apparatus disclosed herein.
The second embodiment of the invention illustrated in Figures 4-7 differs from the first embodiment above described in being moved into position through window of the mill stand rather than over the mill table. Mounted on housing 111, the drive side housing, is a pair of arms 36, one on each side of the housing. Those arms are affixed at opposite ends of a shaft 37 which is journalled in brackets 38 affixed to housing 111, so that arms 36 pivot in brackets 38. Also affixed to shaft 37 between brackets 38 is a pair of crank arms 39, the outer ends of which are pivotally connected to the outer end of a piston rod 40 of a hydraulic cylinder 41, the other end of which is affixed to mill housing 111 so that cylinder 41 swings arms 36 toward and away from work rolls 118 and 119.
The free ends of arms 36 are pivotally connected to channel members 44 which face the work rolls. In those channel members 44 is fitted an elongaged member 45 so as to slide therein parallel to the work rolls and inside the mill stand window. Member 45 extends outside housing 111 on the drive side, and is pivotally connected at its outer end to the piston rod 61 of a hydraulic cylinder 62, the outer end of which is pivotally connected to arm 36 on the outside of housing 111, so that cylinder 62 slides member 45 from a position in which its 10 .
.. . .
3~
inner end abuts the inside face of housing 111 to a position in which its inner end approaches the inside ~ace of housing 110.
Member 45 carries one or more transducers. In Figures 4 and 5 it ls shown carrying three such transducers 46, 47 and 48. Transducer 47 is positioned so as to be located at the longitudinal center of the work rolls when member 45 is fully extended between housings 110 and 111. Transducer 46 is positioned to be located at the ends of the work rolls adjacent housing 110 and transducer 4~ is positioned to be located at the ends of the work rolls adjacent housing 111. However, as will appear, we may also use one roll gap transducer only, and position it at successive locations lengthwise of the wor]c rolls by cylinder 62.
The structure of the roll gap transducer is shown in Figure 7. A cylindrical housing 50 is fixed to member 45 extending toward the work rolls therefrom. In housing 50 and extending therefrom toward the work rolls is a hollow cylinder 51 having an internal shoulder 52 intermediate its ends. A
linear transducer element 53 is fixed within cylinder 51 adja-cent its base. The electric leads from transducer element 53are brought out through a cable 19 described in connection with the first embod~nt of the invention. A plunger 54 fits slideably within cylinder 51 extending beyond the open end thereof and is urged outwardly by coil spring 55 which bears against the inside of plunger 54 and shoulder 52. A rod 56 threaded into the inside end of plunger 54 passes through coil spring 55 and abuts the movable element of transducer element 53. Plunger 54 is held in aJignment with housing 50 by a cap 57 which fits over the upper end of housing 50 but through which plunger 54 passes. The outer end of plunger 5~ which is tapered to a smaller diameter holds a spherical feeler kip 59.
Spherical support tips 60 are affixed to member 45 a~ove an~
below feeler tip 59, so as to make steadying contact with upper and lower work rolls 118 and 119.
The embodiment of the calibrating apparatus above described is normally withdrawn from the space between mill housings 110 and 111 through the window in housing 111 by hydraulic cylinder 62. Arms 36 are raised so as to withdraw member 45 and its associated transducers from the gap of the work rolls by cylinder 41. When the apparatus is to be used, cylinder 62 is operated to move member 45 through the window in mill housing 111 into the space between that housing and mill housing 110. If member 45 carries three roll gap transducers 46, 47 and 48 as shown in Figures 4 and 5, member 45 is moved to its extreme position in which transducer 47 is located at the longitudinal center of the work rolls. Then cylinder 41 is operated to move those transducers into the roll gap. Spring 55 holds plunger 54 in its outermost position and feeler tip 59 carried by it makes contact with the roll gap before support tips 60 make contact with work rolls 118 and 119. Plunger 54 is thus forced back against spring 55 until support tips 60 do make contact. Movement of plunger 54 actuates transducer element 53 and produces a signal therefrom.
It is possible by the use of the second embodiment of the invention above described to employ one transducer only and move it lengthwise of the work rolls by sliding member 45 step-wise, so as to sample the roll gap at any number of desired locations. In such a case, a dispk~y devi.ce more sophisticated than that described herein is desirably employed.
The apparatus of the second embodiment of -the r~
invention above described may be i,nterconnected with the gauge and crown control apparatus in the same way as has been des-cribed herein with respect to the first embodimen-t of the invention.
The apparatus of the first embodiment of the invention is especially useful for calibrating reversing rolling mill stands. In such mills that necessary clearances between chocks and housing and elsewherè in the stand, which cannot be perfectly symmetrical, result in optimum flatness crowning and rolling pressures in one direction of rolling which differ slightly from those for the other direction of rolling. In such reversing stands, the apparatus is rolled in over a mill table in one direction of rolling so as to position its transducers in the bite of the work rolls and the rolling and crowning pressures are adjusted for optimum flatness and gauge in the way herein-before described. The zero settings for the respective pressure applying means are noted or recorded. The apparatus is then rolled through the gap, and brought back in the reverse direc-tion of rolling so as to position its transducers in the bite of the work rolls, and the adjusting procedure is repeated.
The zero settings of the respec-tive pressure applying means in the reverse direction of rolling are also noted. Thus a reversing mill stand can be rapidly set up for rolling a pro~
duct of optimum f],atness and gauge in either direction.
In the foregoing specification we have described presently preferred embodiments of the invention; however, it will be understood that the invention can be otherwise embodied within the scope of the following claims.
The invention is particularly well adapted ~or use with mill stands provided with the closed loop integrated gauge and crown control. Such equipment is disclosed in United States Patent 4,054,043 of Werner W. Eibe, issued October 18, 1977.
In flat product mills for hot rolled plate and strip as well as for cold rolled strip, the dimensional quality of the produc~ depends on the accuracy of the roll gap between the work rolls. Gauge is normally controlled by automatic gauge control systems and the shape by separate roll crown control systems, The most effective variable crown control system is obtained by counter bending the mill rolls opposite their deflection due to rolling forces. As far as crowning the rolls is concernedr it has always been difficult to know that the rolls are absolutely flat so that the product is also flat across its width. With thin strip the flatness is mostly controlled by the operatoris observation of buckles somewhere across the width.
Automatic devices have been conceived that measure the flatness behind the mill, then make corrections to the roll bending cylinders. In heavy plate rolling the shape can only be esta-blished after the finishing pass by measuring the crown. In all these cases it is an after-the-fact measurement and feedback to the control system often resulting in out-of-tolerance non-saleable material.
With regard to automatic gauge control, load cells have been placed underneath the mill screws or the hydraulic piston in case of hydraulic roll adjustment. Thei zeroing and s ~
q ~ ~
levelling of the automatic gauge control system is normally done by facing the slowly rotating work rolls under enough pressure so that all the a~fected mill stand components are stretched or compressed sufficien~ly to have a more or less linear spring characteristic from there on. During this proce-dure the work and back-up rolls would deflect due to roll bend-ing, shear and ~lattening. In the present state of the art, these sizeable deflections had to be neglected during the calibratlon procedure. Only after the product was rolled the shape problems became obvious and could only then be corrected by manual or automatic control of the roll bending system.
It is an object of the invention to provide method and apparatus for calibrating the roll gap in a mill stand both for gauge and for shape flatness. It is ano-ther object to utilize for that purpose electric or hydraulic transducers to measure the pressure across the face of a roll in a mill stand and so make possible the gap calibration. It i5 another object to utilize -the signals from those transducers for actuating a visible display. It is still another object to use those signals as additional inputs into the gauge and control system of a suitable mill control system.
The apparatus of the invention comprises a frame carrying one or more transducers, the frame being dimensioned so that it can be inserted between work rolls of a mill stand with the transducers positioned parallel to the roll axis. The outputs of the transducers are connected to a display device which, when load is applied, displays the several output signals side-by-side so that variation in loading ]engthwise of the rolls is made visible. Those outputs are proportional to the width of the roll gap at the positions of the respec-tive transducers.
3~
The outpu~s of at least the center transdu~er and ~ho ~wo transducers adjacent the ends of a roll are also interconnected into ~he gauge and crown control circuits of a mill con~rol sys~em so that th~se circuits can be calibrated against the actual dimensions of the roll gap.
Thus, in accordance with one broad aspect of the invention, there is provided apparatus for calibrating the gap betwcen work rolls of a rolling mill stand comprising transducer m~ans for converting the width of gap into a signal, frame means for mounting said transducer means, said rame means being dimensioned for passage as a uni~ through the gap between work rolls and ex-tending lengthwise of ~hose rolls so as to bring said transducer means againstthe work rolls at their line of cantact in load transmitting relation there-between and for removal therefrom, and means for cond~cting *he signals from said transducer means out of the gap.
According to another aspect of the invention ~here is provided the method of calibrating for optimum flatness of the product a rolling mill stand provided with pressure means for varying the crown of a work roll comprising positioning in the hite of the work rolls transducer means adapted to convert the wid~h of the gap into a signal, applying pressure to the work rolls, in-dicating the signal from a transducer adjacent a work roll neck, appl~ing crowning pressure to the work ~oll, indicating the signal f~om a transducer centrally located along the roll, and adjusting those pressures until those signals are equal.
In accordance with another aspect of the invention there is provided the method of calibrating for optimum flatness of product a rolling mill stand provided with pressure means for varying the crown of a work roll comprising measuring the separation between work roll necks, converting that measure-ment.to a gauge signal, determining ~he inclination o a work roll axis ~o the horizontal, converting that determination to a crown signal, positioning in the bite of the work rolls transducer means adapted to convert th~ width of gap into a signal, applying crowning pressure to the work rolls correspond-ing to a crowning pressure ~i~nal comprlsing the algebraic sum of the crown 3.
3~
signal and the signal from a centrally loca~ed transducer~ and applying rolling pressure to the work rolls correspon~ing to a rolling pressure signal comprising the algebra.ic sum of the gauge signal and the signal from a transducer adjaccnt a roll neck, and adju~ting those pressures until the crowning pressure signal is e~ual to the rolling pressure signal.
Embodimcnts of the invenkion presently preferred are illus~rated in the attached drawings, to which reference is now made.
Figure 1 is. a vertical cro~s-section of a portion of mill stand perpendicular to the roll axis showing a f~rst cmbodiment of the apparatus in place between the work rolls;
Figure 2 is a plan of the apparatus.shown in Figure l;
Figure 3 is.a cross-~ection of th~ apparatus taken on the plane III-III of Figure l;
Figure 4 is a horizontal cro~s-sec~ion through a mill stand between the work rolls!showing in plan a second embodiment of the apparatus in place;
Figure 5 is~ an elevation of the apparatus of Fi.gure 4;
Pigure 6 is an end elevation of the apparatus of Figures 4 and 5f Figure 7 is.an enlarged cross-section through the apparatus of Figure 4 taken on the~plane VII-VII ~hereof;
Figure 8 i~ a schematic arrangemen~ o the invention in a 4-high mill s.tand interconnected with one embodiment o gauge and crown control apparatus.; and Figure 9 is a schematic arrangement of the .invention in a 4-high mill stand interconnected with another embodimcnt of gauge and crown control apparatus.
The firs.t embodiment of the apparatu~ shown in Figures 1, 2 and 3 compri`ses a rectangular frame 11 hàving 3~.
~ ~33 parallel side pieces 12 and cross pieces 13 a~ each end of ~hose side pieces. Intermediate cross pieces 13 is a pair of spaced-apart cross pieces 14 between whlch are positioned a central transducer 15, transducers 17 at each end of cross pieces 14 and transducers 16 intermediate the central transducer 15 and t~ansducer 17 on each slde. The leads from the various transducers, which conveniently take the form of load cells, are brought out in cable 19 at one end of frame 11. The height of side pieces 12 and cross pieces 13 and 14 is slightly less than the unloaded height of the load cells.
As may be seen in Figures 8 and 9, the apparatus also comprises display means 24 having a central scale 25, scales 27, one at each end, and scales 26 intermediate scales 25 and 27.
The positions of those scales correspond respectively to the positions of load cells 15, 16 and 17 lengthwise of the rolls.
Central load cell 15 is connected to means 24 so as to actuate a pointer which moves vertically on scale 25, through conductors 29, 153, 157 and crown calibrate conditioner 32. End load cells 17 are connected to scales 27 respectively through conductors 31, 155, 160 and gauge calibrate conditioners 33. Intermediate load cells 16 are connected to scales 26 through conductors 30.
Figures 8 and 9 show the electrical connections for one side only of the mill stand and it will be understood that duplicate circuits are provided for the other side of the mill stand.
In use, frame 11 is inserted between lower work roll 119 and upper work roll 118 of a mill stand 110, those rolls, of course bein'g separated to allow frame 11 to en-ter. Frame 11 is rolled in on table rolls 22 on each side oE the mill stand.
Frame 11 is positioned so that its load cells lie in a ver-tical plane through the axis of work rolls 118 and 119, and the rolls 3~
of the mill stand are then brought together against the load cells.
For any given rolling force corresponding to a given gauge of ~inished product, the stand can be adjusted to sub-stantial flatnes~ by regulating the crowning force while the apparatus 11 is in the bite of work rolls 11~ and 119 until the pointers of scales 25, 26 and 27 are brought to substantially the same position. In the embodiment of the display device 24 illustrated, the scales 25, 26 and 27 are vertical and their pointers extend horizontally across them so that when the pointers are brought to the same position they form a horizontal line across the scales. The sources o~ rolling ~orce are then calibrated as are the sources o~ crowning force, so that after the apparatus 11 has been removed from the rolls, the stand can be set up to roll flat material of the desired gauge.
In Figure 8 the apparatus is shown interconnected with gauge and crown control apparatus. A mill stand suitable for the invention comprises an operator's side housing 110 and a drive side housing 111 tied together at top and bottom in con-ventional fashion. Each housing is formed with a conventionalwindow, within which windows are positioned upper backup rolls chocks 112, lower backup roll chocks 113, and, between them, upper work roll chocks 114 and lower work roll chocks 115.
Upper backup roll 116 is journalled in chocks 112, lower backup roll 117 is journalled in chocks 113, upper work roll 118 is journalled in chocks 114 and lower work roll 119 is journalled in chocks 115. ~ hydraulic cylinder 108 with piston 109 is positioned between the top of housing 110 and chock 112 and a like cylinder and piston is positioned in the same way in hous-ing 111. Chocks 113 rest on the bottom of housings 110 and 111.
, Between chocks 114 and 115 in housing 110 ls posi-tioned a pair of hydraulic roll-bending cylinders 123, one on each side of the roll neck. A like pair is positioned in the same location in housing 111. Centrally located within each cylinder 123, is a transducer 124. Work rolls 118 and 119 are provided with elongated necks 125 and 126 respectively which extend through the window in housing 110. Between the outer ends of necks 125 and 126 is fixed a transducer 127. Transducers 124 and 127 are pre~erably mounted to act directly between the upper and lower roll chocks and generate an electrical signal corresponding to movement between the upper and lower roll chocks.
Hydraulic fluid is supplied to pressure cylinders 108 through conduits 120 and 128 from servo valve~29. The latter is furnished hydraulic fluid through conduit 130 from pump 131 which is driven by motor 132~ Pump 131 pumps hydraulic fluid from tank 107 and servo valve 129 discharges into thattank through conduit 133. In like manner, roll bending cylinders 123 are supplied wi-th hydraulic fluid through conduits 121 and 135 from servo valve 136. That valve is furnished hydraulic fluid through conduit 137 from pump 138 which is driven by motor 139.
Pump 138 pumps hydraulic fluid from tank 107 and ser~o valve 136 discharges into that tank through conduit 140.
The electrical output of transducer 127 is connected by conductor 142 to the input of crown signal conditioner 143.
The output of conditioner 143 is connected by conductor 144 to summing junction 145. The electrical output of transducers 124 is averaged and is then connected to gauge siynal conditioner 148 by conduc-tor 147. The output of conditioner 148 is connected to summing junction 145 by conductor 149 and to summing junction 6.
151 by conductor 150. Conditioners 1~3 and 148 are conventional and may include amplifiers, signal shapiny elements and the like.
Crown input command 152 is connected by conductor 153 to summing junction 145. Gauge input command 154 is connected by conductor 155 to summing junction 151. Those commands furnish signals which can be adjusted to correspond to the desired crown and gauge respectively and incorporate read-outs of those values.
Summing junction 145 is connected by conductor 157 to the inputs of gauge servo amplifier 158 and cxown servo amplifier 159.
Summing junction 151 is connected by conductor 160 to the input of gauge servo amplifler 158. The output of that amplifier is connected by conductor 161 to servo valve 129 and the output of crown servo amplifier 159 is connected by conductor 162 to servo valve 136.
We have specifically described above the connections for the apparatus as applied to housing 110 on the operator's side of the mill stand. That apparatus is duplicated on the drive side of the mill stand, with -the exception of transducer 127, and is connected to control apparatus in the same way as has been described for the operator's side of the mill stand.
A transducer identical to 127 would have to be located between the drive spindles for the work rolls 118 and 119, which pre-sents di~ficulties. We find that transducer 127 is adequate to furnish signals to both sides as long as the work is reasonably well centered in the rolls of the mill stand.
The operation of the apparatus of Figure 8 will now be described without reference to the calibrating apparatus shown in Figures 1-3. The following description assumes that there is metal in the stand to be rolled.
Crown signal conditioner 1~3 and gauge signal - - `
:
conditioner 148 are adjusted so that their outputs a~e of opposite polarity. The signals generated by transducer.s 127 and 124 and appearing on conductors ].44 and 149 respectively are brought to summing junction 145 and are there compared with the signal on conductor 153 from crown input command 152.
The bending of the work roll necks 125 and 126 toward each other about the fulcrum at the roll midpoint caused by the application of rolling pressure on those roll necks is counter-balanced by bending the work rolls in the opposite direction about the same fulcrum by bending cylinders 123. The amount of this bending is i.nitially set by adjusting the crown input command 152. Should the material entering the mill display changes in hardness, flatness or gauye, an error signal will appear on conductor 157. That error signal is applied both to crown servo amplifier 159 and gauge servo amplifier 158, so that working pressure cylinders 108 increase or decrease their force by an incremental amount and bending cylinders 123 increase or decrease their force by the same incremental amount but in the opposite direction. Thus, the sum of the vertically acting forces on housings 110 and 111 remains unchanged, and there is no change in the gauge of the work being rolled. However, the bending moment exerted on work rolls 118 and 119 is changed by the product of the change in force of bending cylinders 124 multiplied by their lever arm, the distance between the fulcrum and cylinders 123 or any distance along the face of the backup roll toward the edges.
Therefore, the flatness of the work is preserved.
The gauge desired is initially set by adjustment of gauge input command 154. The signal from transducer 124 through gauge signal conditioner 148 is summed with the 8.
3;~
reference signal from gauge inpu-t com~,and 154 in summing junc-tion 151 and the error signal resulting is applied to gauge servo amplifier 158. In response thereto, servo valve 129 adjusts the fluid pressure in pressure cylinder 108 so as to change the roll gap and thus the signal generated by transducer 124 in the direction to bring the error signal to zero.
The appara~us, as has been mentioned, calibrates the control apparatus above described. Callbrating apparatus 11 is inserted ln the bite of rolls 118 and 119. The signal from centrally located load cell 15 is passed through crown calibra-tor conditioner 32 to summing junction 145, the output of whlch on conductor 157 is displayed on scale 25 of display means 24, as well as belng introduced lnto ampllflers 158 and 159. The signals from outer load cells 17 are passed through calibrator conditioners 33 to summing junctions 151, the outputs of which on conductors 160 are displayed on scales 27 of display means 24, as well as being lntroduced into ampliflers 158. If the outputs of load cells 17 are not equal, the servo ampliflers 158 on opposite side of the mill stand will adjust pressure cylinders 108 to equalize those outputs and that equalization will be made vlslble by display means 24. If the equallzed outputs of cells 17 are different from the output of cell 15, the signal from that latter cell will actuate servo ampliflers 158 and 159 and the pressure ln roll bendlng cylinders 123 will be adjusted to bring those outputs to the same level.
Figure 9 hereln illustrates the calibrating apparatus lnterconnected with another embodiment gauge and crown control apparatus. The only differences between Figures 8 and 9 are those between the two embodiments of the gauge and crown control apparatus. In the embodiment shown in E'igure 8, the work roll L a~3~
crowning is effected by bending the work rolls by cyli~ders 123.
In the second embodiment shown in Figure 9, the work roll crown-ing is effected by adjustable crown backup rolls 176 and 177.
The interconnection of the calibxation apparatus wlth the con-trol apparatus is the same ~or both embodiments. It is not, therefore, believed to be necessary to repeat the full descrip-tion of the second embodiment of the gauge and crown control apparatus nor the description of the interconnections with it of the calibrating apparatus disclosed herein.
The second embodiment of the invention illustrated in Figures 4-7 differs from the first embodiment above described in being moved into position through window of the mill stand rather than over the mill table. Mounted on housing 111, the drive side housing, is a pair of arms 36, one on each side of the housing. Those arms are affixed at opposite ends of a shaft 37 which is journalled in brackets 38 affixed to housing 111, so that arms 36 pivot in brackets 38. Also affixed to shaft 37 between brackets 38 is a pair of crank arms 39, the outer ends of which are pivotally connected to the outer end of a piston rod 40 of a hydraulic cylinder 41, the other end of which is affixed to mill housing 111 so that cylinder 41 swings arms 36 toward and away from work rolls 118 and 119.
The free ends of arms 36 are pivotally connected to channel members 44 which face the work rolls. In those channel members 44 is fitted an elongaged member 45 so as to slide therein parallel to the work rolls and inside the mill stand window. Member 45 extends outside housing 111 on the drive side, and is pivotally connected at its outer end to the piston rod 61 of a hydraulic cylinder 62, the outer end of which is pivotally connected to arm 36 on the outside of housing 111, so that cylinder 62 slides member 45 from a position in which its 10 .
.. . .
3~
inner end abuts the inside face of housing 111 to a position in which its inner end approaches the inside ~ace of housing 110.
Member 45 carries one or more transducers. In Figures 4 and 5 it ls shown carrying three such transducers 46, 47 and 48. Transducer 47 is positioned so as to be located at the longitudinal center of the work rolls when member 45 is fully extended between housings 110 and 111. Transducer 46 is positioned to be located at the ends of the work rolls adjacent housing 110 and transducer 4~ is positioned to be located at the ends of the work rolls adjacent housing 111. However, as will appear, we may also use one roll gap transducer only, and position it at successive locations lengthwise of the wor]c rolls by cylinder 62.
The structure of the roll gap transducer is shown in Figure 7. A cylindrical housing 50 is fixed to member 45 extending toward the work rolls therefrom. In housing 50 and extending therefrom toward the work rolls is a hollow cylinder 51 having an internal shoulder 52 intermediate its ends. A
linear transducer element 53 is fixed within cylinder 51 adja-cent its base. The electric leads from transducer element 53are brought out through a cable 19 described in connection with the first embod~nt of the invention. A plunger 54 fits slideably within cylinder 51 extending beyond the open end thereof and is urged outwardly by coil spring 55 which bears against the inside of plunger 54 and shoulder 52. A rod 56 threaded into the inside end of plunger 54 passes through coil spring 55 and abuts the movable element of transducer element 53. Plunger 54 is held in aJignment with housing 50 by a cap 57 which fits over the upper end of housing 50 but through which plunger 54 passes. The outer end of plunger 5~ which is tapered to a smaller diameter holds a spherical feeler kip 59.
Spherical support tips 60 are affixed to member 45 a~ove an~
below feeler tip 59, so as to make steadying contact with upper and lower work rolls 118 and 119.
The embodiment of the calibrating apparatus above described is normally withdrawn from the space between mill housings 110 and 111 through the window in housing 111 by hydraulic cylinder 62. Arms 36 are raised so as to withdraw member 45 and its associated transducers from the gap of the work rolls by cylinder 41. When the apparatus is to be used, cylinder 62 is operated to move member 45 through the window in mill housing 111 into the space between that housing and mill housing 110. If member 45 carries three roll gap transducers 46, 47 and 48 as shown in Figures 4 and 5, member 45 is moved to its extreme position in which transducer 47 is located at the longitudinal center of the work rolls. Then cylinder 41 is operated to move those transducers into the roll gap. Spring 55 holds plunger 54 in its outermost position and feeler tip 59 carried by it makes contact with the roll gap before support tips 60 make contact with work rolls 118 and 119. Plunger 54 is thus forced back against spring 55 until support tips 60 do make contact. Movement of plunger 54 actuates transducer element 53 and produces a signal therefrom.
It is possible by the use of the second embodiment of the invention above described to employ one transducer only and move it lengthwise of the work rolls by sliding member 45 step-wise, so as to sample the roll gap at any number of desired locations. In such a case, a dispk~y devi.ce more sophisticated than that described herein is desirably employed.
The apparatus of the second embodiment of -the r~
invention above described may be i,nterconnected with the gauge and crown control apparatus in the same way as has been des-cribed herein with respect to the first embodimen-t of the invention.
The apparatus of the first embodiment of the invention is especially useful for calibrating reversing rolling mill stands. In such mills that necessary clearances between chocks and housing and elsewherè in the stand, which cannot be perfectly symmetrical, result in optimum flatness crowning and rolling pressures in one direction of rolling which differ slightly from those for the other direction of rolling. In such reversing stands, the apparatus is rolled in over a mill table in one direction of rolling so as to position its transducers in the bite of the work rolls and the rolling and crowning pressures are adjusted for optimum flatness and gauge in the way herein-before described. The zero settings for the respective pressure applying means are noted or recorded. The apparatus is then rolled through the gap, and brought back in the reverse direc-tion of rolling so as to position its transducers in the bite of the work rolls, and the adjusting procedure is repeated.
The zero settings of the respec-tive pressure applying means in the reverse direction of rolling are also noted. Thus a reversing mill stand can be rapidly set up for rolling a pro~
duct of optimum f],atness and gauge in either direction.
In the foregoing specification we have described presently preferred embodiments of the invention; however, it will be understood that the invention can be otherwise embodied within the scope of the following claims.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for calibrating the gap between work rolls of a rolling mill stand comprising transducer means for converting the width of gap into a signal, frame means for mounting said transducer means said frame means being dimensioned for passage as a unit through the gap between work rolls and ex-tending lengthwise of those rolls so as to bring said transducer means against the work rolls at their line of contact in load transmitting relation there-between and for removal therefrom, and means for conducting the signals from said transducer means out of the gap.
2. Apparatus of claim 1 in which the transducer means comprise a plural-ity of transducers positioned in a straight line lengthwise of the rolls.
3. Apparatus of claim 2 including a transducer centrally located length-wise of the rolls and at least one transducer positioned on each side of the central transducer.
4. Apparatus of claim 1 in which the dimension of the frame means nor-mal to the direction of rolling is less than that dimension of the transducer means mounted therein.
5. Apparatus of claim 4 in which the transducer means are load cells.
6. The method of calibrating for optimum flatness of the product a rolling mill stand provided with pressure means for varying the crown of a work roll comprising positioning in the bite of the work rolls transducer means adapted to convert the width of the gap into a signal, applying pressure to the work rolls, indicating the signal from a transducer adjacent a work roll neck, applying crowning pressure to the work roll, indicating the signal from a transducer centrally located along the roll, and adjusting those pres-sures until those signals are equal.
7. The method of claim 6 adapted for a reversing rolling mill stand including the steps of positioning transducer means in the bite of the work rolls by moving those means into the stand in one direction of rolling, positioning transducer means in the bite of the work rolls by moving those means into the stand in the reverse direction of rolling, and separately recording the optimum gauge and flatness adjustments of rolling pressure and crowning pressure for each direction of rolling.
8. The method of calibration for optimum flatness of product a rolling mill stand provided with pressure means for varying the crown of a work roll comprising measuring the separation between work roll necks, converting that measurement to a gauge signal, determining the inclination of a work roll axis to the horizontal, converting that determination to a crown signal, positioning in the bite of the work rolls transducer means adapted to con-vert the width of gap into a signal, applying crowning pressure to the work rolls corresponding to a crowning pressure signal comprising the algebraic sum of the crown signal and the signal from a centrally located transducer, and applying rolling pressure to the work rolls corresponding to a rolling pressure signal comprising the algebraic sum of the gauge signal and the signal from a transducer adjacent a roll neck, and adjusting those pressures until the crowning pressure signal is equal to the rolling pressure signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000383667A CA1136848A (en) | 1978-06-07 | 1981-08-11 | Rolling mill gauge and flatness calibration system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US913,308 | 1978-06-07 | ||
| US05/913,308 US4186579A (en) | 1977-09-14 | 1978-06-07 | Rolling mill gauge and flatness calibration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1111638A true CA1111638A (en) | 1981-11-03 |
Family
ID=25433154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA317,679A Expired CA1111638A (en) | 1978-06-07 | 1978-12-11 | Rolling mill gauge and flatness calibration system |
Country Status (3)
| Country | Link |
|---|---|
| JP (2) | JPS54159370A (en) |
| CA (1) | CA1111638A (en) |
| DE (2) | DE2854290A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19547436A1 (en) * | 1995-12-11 | 1997-06-12 | Mannesmann Ag | Roll contour measuring device |
| CN113084111B (en) * | 2021-03-25 | 2022-04-08 | 中天钢铁集团有限公司 | Method for correcting pressing precision of continuous casting withdrawal and straightening machine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2032584A (en) * | 1931-12-04 | 1936-03-03 | Irving Trust Co | Distance and impression gauge |
| US2332289A (en) * | 1942-06-04 | 1943-10-19 | Sperry Prod Inc | Method and means for leveling rolling mills |
| GB886238A (en) * | 1957-05-16 | 1962-01-03 | Karl Bertil Gunnarsson Malmber | Gauge or similar device for measuring the space between two working rollers |
| DE1752947A1 (en) * | 1968-08-10 | 1971-04-15 | Moeller & Neumann Gmbh | Measuring device for recording the roll gap |
| JPS4828269A (en) * | 1971-08-17 | 1973-04-14 | ||
| US3718019A (en) * | 1971-12-16 | 1973-02-27 | Steel Corp | Gauge device for alignment of rolls of a rolling mill |
| JPS5414590B2 (en) * | 1974-03-11 | 1979-06-08 | ||
| US4054043A (en) * | 1976-12-02 | 1977-10-18 | Blaw-Knox Foundry & Mill Machinery, Inc. | Closed loop integrated gauge and crown control for rolling mills |
-
1978
- 1978-12-11 CA CA317,679A patent/CA1111638A/en not_active Expired
- 1978-12-15 DE DE19782854290 patent/DE2854290A1/en active Granted
- 1978-12-15 DE DE19782858119 patent/DE2858119C2/de not_active Expired
- 1978-12-25 JP JP15871978A patent/JPS54159370A/en active Pending
-
1983
- 1983-06-01 JP JP58095864A patent/JPS5916610A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2854290A1 (en) | 1979-12-13 |
| DE2854290C2 (en) | 1989-06-29 |
| DE2858119C2 (en) | 1989-07-06 |
| JPS5916610A (en) | 1984-01-27 |
| JPS54159370A (en) | 1979-12-17 |
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| MKEX | Expiry |