JPS5916610A - Calibrator for gage and degree of flatness of rolling mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill. More specifically, the present invention provides a method for determining the gauge and flatness (f) of the product.
The present invention relates to a method and apparatus for calibrating a rolling mill with respect to latness.

The present invention can be particularly effectively applied to a rolling machine equipped with a gauge and a crown control device connected in a closed loop. The nuclear device is patented in Japan Patent No. 4,054,046.
Disclosed in the issue.

Similar to the rolling mill for cold rolled strips, hot rolling 6-7 is used.In the flat product rolling mill for rolled plates and strips, the dimensional product JjR is the p-ru between the two workpieces. Depends on the accuracy of the gap. Gauge is usually automatic gauge &I
J control and the shape is flilJ controlled by a separate roll crown control. The most effective round control is achieved by bending the mill roll t7 in a direction opposite to the roll deflection due to rolling forces. p-le's crown (crowning)
insofar as the roll is absolutely flat,
Therefore, it was interesting to learn that the product is also flat in the width direction. In the case of thin strips, flatness is often controlled by the operator by observing whether curvature occurs anywhere along the width.

An automatic device was devised that measures the flatness at the rear of the rolling mill and then causes the cylinder to correct the roll curve. In large plate rolling operations, the shape is only set by measuring the crown after passing through the finishing process.

In such cases, subsequent measurements are taken and fed back to the control system, often resulting in unacceptable material that cannot be sold.

With regard to automatic gauge controls, load cells have been located under the rolling mill screw or, in the case of hydraulic roll adjustment, under the hydraulic piston. The zero point and level adjustment 'Ii of the automatic gauge control device is normally set so that all the components of the rolling mill subjected to forming are rotated so that the two work rolls face each other under sufficient pressure of the root skin to undergo some elastic deformation. It is done by letting When carrying out this method, the back-up roll is deflected due to bending, shearing and flattening of the pull.With the current state of technology, such fairly large deflections cannot be avoided during the calibration process. It had to be ignored.

Deshaping problems become apparent only after the product has been rolled, and then roll whitening can be done manually or automatically using equipment. It could only be corrected by vI control.

It is an object of the present invention to provide a method and apparatus for calibrating the roll distance of a rolling mill to adjust gauge and profile flatness. Another object is to utilize for this purpose electrical or hydraulic transducers for measuring the pressure across the surface of the rolling mill rolls and allowing clearance calibration. Another purpose is to utilize the signals from these transducers to operate a visual display device. Yet another object is to utilize these signals as additional inputs to the gauge and crown controls of appropriate rolling mill controls.

The device according to the invention comprises a frame carrying one or more transducers, the frame ~ A ii O-
It is sized so that it can be inserted between the work rolls of a rolling mill with a transducer arranged parallel to the roll axis. The output of the transducer is connected to a display device which displays several output signals in parallel so that the variation in load along the length of the pole can be visualized when a load is applied. These outputs are proportional to the width of the roll nip at each transducer location. The outputs of at least the central transducer and the two transducers near the ends of the roll are connected to a gauge and crown control circuit of a rolling mill controller;
These circuits can thereby be calibrated to the actual dimensions of the four-wheel display.

An embodiment that is currently considered preferable will be described with reference to the drawings.

1% The device 1 according to the first embodiment illustrated in FIGS. 82 and 3 has parallel side members 12 and transverse members 15 provided at each end of the side members. rectangular frame 1
1. A pair of spaced apart transverse members 14 are provided intermediate the MA member 13.

Also between the spaced apart transverse members 14 is a central transducer 1.
5. Transducers located at each end of the transverse member 14) A transducer 16 located between the user 17 and each central transducer 15 and transducer 17 is disposed. The conductors of each transducer, usually in the form of a load cell, are brought out by a cable 19 provided at one end of the frame 11. The height of the side members 12 and cross members 13,14 is made somewhat lower than the height of the load cell in the unloaded state.

As shown in FIGS. 8 and 9, the apparatus also includes display means 24. As shown in FIGS. The display means has a central scale 25, a scale 27 at each end, and a scale 26 between scales 25 and 27. The position of the scale is the load cell 15 located in the longitudinal direction of the roll.
16 and 17, respectively. The central load cell 15 is connected to the means 24 via a guide and a crown calibration dyeable device 32 to actuate a vertically moving pointer on the scale 25. End p
- the cell 17 is connected to the scale 27 via conductors 31, 155, 160 and the gauge calibration adjustment device [33]; Intermediate p-docell 16 is connected to scale 26 via four wires 30. It will be appreciated that FIGS. 8 and 9 only show the electrical connections to one side of the rolling mill, so that the same circuit is provided for the other side of the rolling mill. .

When using the lower work rule 1 of frame 11 rolling mill
19 and the upper work rule 118. Of course, it is separated in order to insert the p-rule #'i frame 11. The upper K of the table rolls 22 provided on each side of the rolling mill with 11 frames is arranged. The frames 11 are arranged so that each p-cell lies in a vertical plane passing through the axes of the work rolls 118 and 119, and then the rolls of the LLE rolling mill are arranged to abut each load cell.

In order to provide a predetermined rolling force corresponding to a predetermined gauge of the final product, the rolling mill uses scales 25.
#70 to a substantially flat position by leveling the crown 14 until the hands are brought to substantially the same position.
t4 can be adjusted. The illustrated display device f
In the embodiment of ii24, scales 25, 26 and 27 are vertical and each pointer of the scale extends horizontally across the scale, so that when the pointers are brought to the same position, each pointer extends horizontally across the scale. Forms a single horizontal line across the scale. FF: The source of soil force and the source of crown force are calibrated so that after the device 11 is removed from the rolls the mill is set to roll flat material of the desired gauge.

In FIG. 8, the device is connected to a gauge and crown control. A rolling mill suitable for the present invention comprises an operator side housing 110 and a drive side housing 111, both housings connected together at the top and bottom as is conventional. A conventional window is formed in each housing and includes an upper back-up roll chock 112, a lower back-up roll chock 113, and an upper work roll chock 114 and lower work roll chock 114 disposed therebetween. A work roll chock 115 is installed internally.

Upper backup roll 116 is bearing in chock 112, lower backup roll 117 is bearing in chock 113, upper work roll 118 is bearing in chock 114, lower work roll 119 is bearing in chock 115.
Bearing inside. A hydraulic cylinder 108 with a piston 109 is disposed between the top of the housing 110 and the chock 112, and a similar cylinder and piston are similarly disposed on the housing 111. chock 11
3 is placed on the bottom of the housings 110 and 111.

A pair of hydraulic cylinders 123 are disposed between the chocks 114 and 115 of the housing 110, one on each side of the roll neck. The same pair of cylinders is also arranged at the same position in the housing 111. Each cylinder 12
A transducer 124 is disposed in the center of 3.

Work rolls 118 and 119 have elongated necks 125 and 12 that project through windows in housing 110.
6 are provided respectively. A transducer 127 is mounted between the outer ends of necks 125 and 126. Transducers 124 and 127 preferably operate in contact between the upper and lower roll chocks;
The upper roll chock is mounted to generate an electrical signal corresponding to movement between the chock and the lower roll chock.

Working fluid is supplied to cylinder 108 from servo valve 129 via conduits 120 and 128. Working fluid is supplied to the oU servo motor from a pump driven by the motor 132 via a conduit i3a. Pump 131 pumps working fluid from tank 107 and servo valve 129
discharges into the tank via conduit 135. Similarly, for roll music, the cylinder 123 has 4v1 from the servo valve 156.
Working fluid is supplied via 21 and 135. The servo valve 136 is supplied with working fluid via a conduit 137 from a pump 138 driven by a motor 139 .

Pump 131 pumps working fluid from tank 107;
Servo valve 166 is #1. Discharge into the tank via tube 140.

The electrical output of transducer 127 is connected to the input of crown signal conditioner 146 by signal m142. The output of the regulator 143 is connected to the summing connection point 1 by a conductor 144.
45. The transducer 1240 electrical output is averaged and then connected by conductor +11i 1147 to gauge signal conditioner 148. The output of regulator @148 is connected to summing junction 145 by conductor 149 and to conductor 4i.
It is connected to the summing contact 151 by i1150. The board devices 143 and 148 are conventional and include, for example, amplifiers, signal conditioning elements, and the like. Crown input command device f11152 is connected to addition connection point 145 by ``4I line 153. Gauge input command device 1115
4 is connected to summing junction 151 by conductor @155. These command devices provide signals which can be adjusted to correspond to the desired crown and gauge, respectively, and the devices are equipped with a readout device for these values. Addition connection point 1
45 is gauge servo increase 1lIl by lead #j1157
i unit 158 and crown servo amplifier 15? connected to the input of It is connected to the input of the gauge servo amplifier 158 by the addition point 1s 1t[li 60. The output of the amplifier is connected to the servo valve 129 by a conductor 161, and the output of the crown servo amplifier 159 is connected to the conductor IMi.
62 to the servo valve 156.

The above explanation is based on the housing 1 installed on the operator side of the rolling mill.
10, except for the transducer 127, which is also provided on the drive side of the rolling mill,
and is connected to the control device in the same manner as described for the operator side of the rolling mill.

A transducer identical to 127 would have to be placed between the drive spindles for work rolls 118 and 119, which would be extremely difficult. Applicants have determined that the transducer 127 is suitable for providing signals on both sides, as long as the workpiece is placed very well in the center of the mill roll.

The operation of the apparatus of FIG. 8 will now be described without reference to the calibration apparatus illustrated in FIGS. 1-3.

In the following description it is assumed that there is metal to be rolled in the rolling mill.

The crown signal adjustment device I145 and the gauge signal 1 adjustment device M148 are adjusted so that each output of the device has an opposite polarity. The signals generated by transducers 127 and 124 and appearing on leads Ill7A 144 and 149 are provided to summing junction 145 where they are compared with the $4153 signal from crown input command unit 152. The bending of the work roll necks 125 and 126 towards each other about a fulcrum at the midpoint of the rolls, which is caused by the application of rolling edges to the work roll necks, is effected by bending cylinders 123 about the same fulcrums. Balance is achieved by bending the work rolls in opposite directions at . The bend angle is initially set by adjusting the crown input command device 152. If the hardness, flatness or gauge of the material entering the mill changes, an error signal will appear on lead 157. The error signal is sent to the crown servo amplifier 1.
59 and gauge servo amplifier 158, so that the working pressure cylinder 10B increases or decreases its force depending on the magnitude of the increment, and the bending cylinder 12
1 also increases or decreases its force by the same increment magnitude but in the opposite direction.

Therefore, the total force acting perpendicularly to housings 110 and 111 does not vary, nor does the gauge of the workpiece being rolled. However, work rolls 118 and 11
The bending moment applied to 9 varies by the product of the force variation of the bending cylinder 124 and the distance between its lever arm, i.e. fulcrum, and the cylinder 123 or towards the edge along the surface of the backup roll. do.

The desired gauge is initially set by adjusting the gauge input command device 154. The signal from transducer 124 through gauge signal conditioner 148 is routed to summing junction 151.
The error signal generated is added to the reference signal from the gauge input command device 154 and applied to the gauge servo amplifier 158.

In response, servo valve 129 adjusts the gap between the rolls and thus transducer 12 in a direction that nullifies the error signal.
The fluid pressure in pressure cylinder 108 is adjusted by 11 to vary the signal generated by 4.

As mentioned above, the heavy equipment Wt calibrates the control device.

The calibration device 11Fi is inserted into the retaining portion of the rolls 118 and 119. The signal from the centrally located p-docel 15 is connected via a crown calibrator regulator 52 to a summing junction 145, the output from which on conductor 157 is introduced into amplifiers 158 and 159 and It is displayed on the scale 25 of the display means 24. The signal from the outer load cell door is connected via a calibrator adjuster 33 to a summing junction 151 and the output from said summing junction on conductor 160 is introduced into an amplifier 158 and a scale 27 of the display means 24. will be displayed.

If the outputs of the two quadruple cells 17 are not equal, servo amplifiers 158 on both sides of the mill stand will bias the pressure cylinders 108 to equalize their outputs. This balancing operation will also be visualized by display means 24. If each output of equalized cell 17 is different from the output of cell 15, then the cell 1
The signal from 5 will activate servo amplifiers 158 and 159 and the roll curve will be adjusted so that the pressure in cylinder 123 brings these outputs to the same level.

FIG. 9 represents a calibration device connected to a gauge and crown control according to another embodiment. The only difference between FIG. 8 and FIG. 9 is the difference between the two embodiments of the gauge and crown control. be. In the embodiment illustrated in FIG. 8, crown adjustment of the work roll is performed by bending the work roll by cylinder 123. In a second embodiment illustrated in FIG. 9, this is accomplished by adjustable crown backup rolls 176 and 177 of the work rolls.

The manner of connection between the calibration device and the control device is the same in both embodiments. Accordingly, there is no need to re-describe the second embodiment of the gauge and crown control device and its connection with the calibration device described herein.

A second embodiment of the invention, illustrated in FIGS. 4-7, differs from the first in that it is moved into position from above the mill table and through the window of the mill stand. This is different from the embodiment of . Housing 1
11, that is, a pair of arms 36 are attached to the sliding housing, one on each side of the housing. These arms are attached to both ends of a shaft 670, and the shaft 37 is connected to a shaft 38 attached to the housing 111.
bearing. Therefore, the arm 36 pivots on the bracket 3♂. Also, a pair of crank arms 39 are attached to the bracket 5.
8 is attached to the shaft s7. The crank arm 5
The outer end of the piston red 40 of the hydraulic cylinder 41 is pivotally connected to the outer end of the piston red 40 of the hydraulic cylinder 41.
is attached to the rolling mill housing 111 so as to swing the arm 36 toward and away from the work rolls 118 and 119. The free end of arm 36 is pivotally connected to a channel member 44 facing the work roll.

An elongated member 45 is fitted onto the channel member 44 for sliding movement parallel to the work rolls and within the window of the mill stand. The member 45t'i protrudes outward from the housing 111 toward the drive side, and its outer end is pivotally connected to the piston red 61 of the hydraulic cylinder 62. The outer end of the hydraulic cylinder 62 is pivotally connected to an arm 66 provided on the outside of the housing 111, whereby the cylinder 62
slides the member 45 from a position where its inner end abuts inwardly on the housing 111 to a position where the inner end approaches the inner surface of the housing 110.

Member 45 carries one or more transducers. Three transducers 46 are shown in FIGS. 4 and 5.
．． 1 bearing 47 and 48 is shown. Transducer 47 has member 45 connected to housings 110 and 111.
It is positioned so that it is located at the longitudinal center of the work roll when it is fully extended between ψ. Transducer 46 is positioned at the end of the work roll adjacent housing 110.

The transducer 48 is also positioned at the end of the work roll adjacent to the work housing 111. However, as will be apparent, only a few single-gap transducers are used and the transducer is positioned at the end of the work roll adjacent to the work roll. The cylinder 62 can be arranged at various positions along the longitudinal direction.

The structure of the 0-#[M) transducer is illustrated in FIG. A FllIII-shaped housing 50 is attached to a member 45 that protrudes toward the work roll. A hollow cylinder 51 having an internal M52 at the middle portion is provided to protrude from the housing 50 toward the work roll. A linear transducer element 55 is mounted within the cylinder 51 and in contact with its base. Transducer element 53
The electrical leads from the cable 1? described in connection with the first embodiment of the invention? ') A plunger 54 pulled out through the cylinder 51 is slidably fitted into the cylinder 51 so as to protrude outward from the open end of the cylinder 51, and the plunger 54 is connected to the inside of the plunger 54 and the waste. A rod 56 is screwed into the inner end of the zero plunger 54, which is biased outwardly by a coil spring 55 in contact with the rod 52.
passes through coil spring 55Vtjij and abuts the flexible IIJ element of transducer element 53. Plunger 54
The cap 57 is held in alignment with the housing 50 by a plunger 57 which fits over the upper end of the housing 50 and the plunger 54 is configured to pass through the cap. A spherical feeler tip 5 is attached to the outer end of the plunger 54, which is tapered to a smaller diameter. A spherical support chip 60 is attached to the member 45 above and below the filler chip 59, and the upper and lower work rules 118.11? Stable contact with.

The calibration device according to the embodiment described above typically uses a hydraulic cylinder 62.
is retracted from the space between mill housings 110 and 111 through a window in housing 111. Arm 36 moves member 45 and lS! from the gap between the work rules. ! The I transducers are lifted by cylinder 41 to retract them. When the apparatus is in use, the cylinder 42 is actuated to move the member 45 through the window of the mill housing 111 and into the space between the housing and the mill housing 110.

If member 45 carries three roll gap transducers 46, 47 and 48 as shown in FIGS. is moved to its extreme position such that it is placed in position. Cylinder 41 is then actuated to move the transducers into the nip. A spring 55 holds the plunger 54 in its outermost position so that the filler chip 59 carried by the plunger first contacts the roll nip and then the support chip 60 contacts the work rolls 118 and 11?
come into contact with. Plunger 54 therefore supports support tip 60
is pushed back against the spring 55 until it makes contact. The movement wJ of plunger 54 actuates transducer element 53, thereby producing a signal.

It is a second embodiment of the present invention to use only one transducer and to move the transducer in steps in the longitudinal direction of the work roll by means of a sliding member 45 to measure the roll gap at any desired position. This becomes possible by using In such a case, it is preferable to use a more sophisticated display device than the one described above.

The device according to the second embodiment of the invention described above can be connected to the gauge and crown control device in the same way as described with respect to the first embodiment of the invention.

The device according to the first embodiment of the invention is particularly useful for calibrating reversing rolling mills. In such a rolling mill,
The required clearance between each chip and the housing and in either of the rolling mills provides optimum flatness. Also, the crown and rolling pressure in one rolling direction at this time are somewhat different from those in the other rolling direction. In the reversible rolling mill, the device t is inserted onto the rolling mill table in the rolling direction to position the transducer at the meshing part of the work roll, and the rolling and crown pressures are adjusted to the optimum flatness using the above method. and gauge. The zero setting for each pressure applying means is noted or recorded. The device is then rolled through the gap and returned in the opposite rolling direction, one of the work rolls
1- Position the transducer at the joint. Adjustment work is performed repeatedly. The zero setting of each pressure applying means in the counter rolling direction is also noted. In this way, the reversible rolling trIA is quickly set up to roll products with optimal flatness and gauge in both directions.

Although the presently preferred embodiments have been described, it will be understood that the invention may be practiced in other embodiments.

FIG. 1 is a cross-sectional view of a part of the rolling mill perpendicular to the roll axis, showing a first embodiment of the apparatus disposed between the work rolls.

FIG. 2 is a plan view of the apparatus shown in FIG.

#Is is a sectional view of the device taken along plane m1-1 in FIG.

FIG. 4 is a horizontal cross-sectional view showing a second embodiment of the apparatus disposed between work rolls.

FIG. 5 is a plan view of the apparatus of FIG. 4.

FIG. 6 is an end view of the apparatus of FIGS. 4 and 5. FIG.

FIG. 7 is an enlarged sectional view of the device of FIG. 4 taken in the plane ■--■.

FIG. 8 is a schematic diagram in which the present invention is applied to a rolling mill connected to a gauge and crown control device according to one embodiment.

FIG. 9 is a schematic diagram in which the present invention is applied to a rolling mill connected to a gauge and crown control device according to another embodiment.

11: Frame 15.16.17: 44.47.48; 124.127
: ) Transducer 19: Cable 24: Display means 44: Channel member 45: Elongated member 59: Stylus tip 60: Support tip 110.111: Heathing 112.113.114.115: Choke 115.
114: Backup roll 118.119j Work roll 125.126g Work roll neck

Claims (1)

[Claims] 1) A combination of a rolling mill and a calibration device for calibrating a gap between work rolls of the rolling mill, the calibration device comprising: a device for converting the width of the gap into a signal; transducer means and frame means for mounting said transducer means, said frame means being configured for insertion into and removal from a gap between said work rolls to bring said transducer means into contact with said work rolls. , and said rolling mill includes: pressure means for changing the gauge of the metal in the rolling mill, means for changing the crown of the work rolls, and measuring the separation between the work rolls at the tick position if and measuring the gauge therefrom. means for providing a signal; means for determining and generating a crown control signal therefrom; means for controlling the pressure means in accordance with the gauge signal; and means for controlling the pressure means in accordance with the gauge signal; means for controlling said crown variation means in accordance with a control signal number; further means for algebraically adding a signal from a transducer means adjacent said chock to said gauge signal; and centrally located transducer means. and means for algebraically adding a signal from the crown control signal to the crown control signal. 2) A method for calibrating a rolling mill equipped with pressure means for changing the crown of the work rolls to obtain optimum product flatness, the method comprising: measuring the separation between the necks of the work rolls; Step of converting into a signal Step of determining the inclination of the work roll axis with respect to the horizontal I Step of converting the determination into a crown signal Process of arranging transducer means at the meshing part of the work rolls and converting the width of the gap into a signal Preliminary notes A process number for applying crown pressure to the work roll in response to a crown pressure signal consisting of an algebraic phase between the crown signal and a signal from a centrally arranged transducer. a step of applying a rolling pressure to the work roll in response to a rolling pressure signal consisting of an algebraically multiplex phase with a signal; and a step of adjusting each pressure until the crown pressure signal becomes equal to the rolling pressure signal. A rolling mill calibration method comprising: