JPS62234607A - Roll offset adjusting device for rolling mill - Google Patents

Abstract

PURPOSE:To optionally and exactly adjust an offset rate of work rolls relative to back up rolls by moving liquid pressure cylinders on an inlet side of a material to be rolled and liquid pressure cylinders on an outlet side by a tuning actuator until the extents of the operation of said cylinders coincide with each other and moving the work rolls in a horizontal direction. CONSTITUTION:A tuning rod 92 of a tuning cylinder 88 is moved to the left and an oil pressure is supplied to high-pressure chambers 50, 50a from the liquid pressure cylinders 42, 42a when the oil pressure is supplied from a liquid pressure generator 114 to the 1st hydraulic chamber 140 of a driving cylinder 134. The volume of the chambers 98, 102 of the tuning cylinder 88 is expanded at the same instant to suck the oil pressure in the high-pressure chambers 48, 48a of the liquid pressure cylinders 40, 40a by as much as the amt. of the oil supplied into the liquid pressure cylinders 42, 42a. As a result, the liquid pressure cylinders 42, 42a moved to the right and the liquid pressure cylinders 40, 40a on the inlet side of the material to be rolled are moved to the right by as much as the extent of the movement thereof. Work roll chocks are, therefore, pinched by respective guide members and are moved by as much as the extent of the movement of the respective guide members to the inlet side of the material to be rolled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roll offset adjustment device for a rolling mill that requires variable axial center positions of a work roll and a reinforcing roll.

2 [Prior Art] In recent years, there has been a trend toward smaller diameter work rolls for rolling special steels with high hardness and rolling thin plates. However, when the diameter of the work roll is reduced, a problem arises in that the work roll is deflected in the horizontal direction during rolling. Therefore, by making the axial center position of the work roll and the axial center position of the reinforcing roll different in the traveling direction of the material to be rolled, and optimizing the direction and amount of the difference (offset), the work roll Various stabilization methods have been studied. Conventionally, as a device for adjusting this offset,
The one shown in Publication No. 227 is generally used.

The device described in Utility Model Publication No. 48-27227 incorporates a cylinder into the bearing box of the upper and lower work rolls, connects the piston rod of this cylinder to a 71 housing, and operates this cylinder to position the axial center of the work roll. This discloses a structure in which the axial center position of the reinforcing roll can be arbitrarily selected on the entry side or the exit side of the material to be rolled. Also,
The same Japanese Utility Model Publication No. 48-27227 states, ``A wedge is provided between the lower work roll bearing box and the housing, and by moving this wedge up and down with a hydraulic cylinder, the axis of the work roll is adjusted in the same way as the cylinder. The center position can be arbitrarily selected and placed on the entry side or exit side of the rolled material with respect to the axial center position of the reinforcing roll.

[Problem that the invention seeks to solve]

However, the above-mentioned offset adjustment device that moves the work roll in the horizontal direction using cylinders is designed to stop the work roll at the stroke end of each cylinder, and no consideration has been given to adjusting the arbitrary movement amount. . This also applies to those using wedges. However, the gap between the upper and lower work rolls through which the rolled material passes affects the accuracy of the finished product. Since the gap between the upper and lower work rolls is affected by the amount of offset, it is necessary to constantly adjust the amount of offset during rolling.

Therefore, the method described in Japanese Utility Model Publication No. 48-27227 does not take into consideration the fact that the amount of offset must be constantly adjusted, and is therefore not suitable for a rolling mill that rolls highly accurate products. Furthermore, in the offset adjustment device described above, the cylinders installed in the bearing box or the cylinders that operate the wedges are individually adjusted, so the movement of these cylinders can be adjusted at any position other than the stopper end. In this case, differences may occur between the cylinders, and there is a risk that roll parallelism, which is extremely important for the plate shape, may not be maintained.

The present invention has been made in order to eliminate the drawbacks of the above-mentioned prior art, and it is an object of the present invention to provide a roll offset adjustment device for a rolling mill that can arbitrarily and accurately adjust the amount of offset of a work roll with respect to a reinforcing roll. purpose.

[Means for solving problems]

The present invention provides a guide member that is brought into contact with one side and the other side in the direction of movement of a rolled material of a bearing box that rotatably supports a work roll disposed between a pair of reinforcing rolls; A hydraulic cylinder that moves each of the guide members forward and backward along the traveling direction of the rolled material, and an operation that simultaneously supplies working fluid to one of the hydraulic cylinders. This is a roll offset adjustment device for a rolling mill, characterized in that it has a synchronized actuator that discharges working fluid from the other hydraulic cylinder in the same amount as the amount of fluid.

[Effect]

In the present invention configured as described above, working fluid is supplied to either one of the hydraulic cylinders disposed on the negative side and the other side of the work roll bearing box in the direction of movement of the rolled material, for example, the hydraulic cylinder on the output side of the rolled material. is supplied via a synchronized actuator, and at the same time, the synchronized actuator discharges an amount of working fluid equivalent to the amount of working fluid supplied from the hydraulic cylinder on the input side of the rolled material to the hydraulic cylinder on the output side of the rolled material, By moving the work roll horizontally by matching the operating amounts of both hydraulic cylinders, it is possible to accurately and easily obtain any desired offset amount by moving the work roll horizontally. It is.

〔Example〕

A preferred embodiment of the roll offset adjusting device for a rolling mill according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a sectional view showing the main parts of a four-high rolling mill equipped with a roll offset adjusting device according to the present invention.

In FIG. 2, an upper work roll 16 and a lower work roll 18 for rolling a material to be rolled 14 are arranged within the window 12 of the roll housing 1. These pair of work rolls 1
6.18 is supported by work roll chocks 20.22 provided at both ends, ie on the drive side and the work side. The work roll chock 20.22 has a built-in bearing (not shown), rotatably supports the work roll 16.18, and receives the thrust load of the work roll.

On the outside of the work rolls 16 and 18, there are upper and lower reinforcing rolls 2.
4.26 is provided in contact with the work roll 16.18.

These reinforcing rolls 24.26 have built-in bearings (not shown), and reinforcing roll chocks 28.3 that receive thrust loads.
0 and is rotatably supported. And work roll 1
6.18 is offset by α with respect to the reinforcing roll 24.26. That is, work roll 16.18
The axes of the work rolls 16, 18 and the axes of the reinforcing rolls 24 and 26 are shifted in the horizontal direction (in the direction of movement of the material to be rolled). It is located on the exit side of the rolled material by α from the axis of .26.

The housing 10 has window portions 1 on the inlet side and the outlet side of the material to be rolled.
Project blocks 32 and 34 protruding from 2 are fixed. A guide member 36.38 is slidably inserted into each project block 32.34. and,
The guide members 36, 38 have a substantially T-shaped cross section, and the insertion portion into the project block 32, 34 forms a hydraulic cylinder 40°42. These hydraulic cylinders 40, 42 have a hydraulic chamber which is connected to a high pressure chamber 48 by a piston 44,46.
．． 50 and back pressure chambers 52 and 54. And piston rond 56.5 provided on piston 44.46
The tip of 8 is fixed to the roll housing 10.

The tip surfaces of the guide members 36 and 38 serve as guide surfaces,
It comes into contact with the side surface 60 of the work roll chock 20.22, guides the work roll chock 20.22 in the vertical direction, and serves as a guide when the work roll chock 20.22 moves in the horizontal direction. In addition, the guide member 36.3
A pair of bending hydraulic cylinders (bending cylinders) 62 and 64 are installed in the distal ends of the cylinders 8 in a direction perpendicular to the axes of the hydraulic cylinders 4o and 42, respectively. The tips of these bending cylinders 62.64 come into contact with protrusions 66.68 formed at the ends of the work roll chock 20.22, and can apply a pending force to the work roll 16.18 via the work roll chock 20.22. It looks like this. An axle 70 is attached to the lower end of the protrusion 68 of the lower work roll chock 22. This axle 70 is adapted to roll on a recombination rail 72 fixed to the roll housing 10 via project blocks 32, 34 during roll recombination.

The above-mentioned project blocks 32, 34 and guide members 36, 38 are provided on the drive side and the work side, respectively, as shown in FIG. is marked with a). The lower work roll chock 22a on the work side is provided with a protrusion 74 at its outer end in the roll axis direction. This protrusion 74
is a stepped portion 7 formed on the inner surface of the guide members 36a, 38a.
It is in contact with 6. A clamp member 78 is removably or rotatably attached to the guide members 36a, 38a with bolts or the like. This clamp member 78 is
The protrusion of the work roll chock 22a is guided by the guide members 36a, 3.
It clamps together with the stepped portion 76 of 8a to prevent movement of the work roll 18 in the axial direction.

On the other hand, a piping attachment/detachment device 80 is fixed to the guide members 36 and 38 on the driving side. This piping attachment/detachment device 80 is connected to an oil supply port 82 protruding from the outer end surface of the lower work roll chock 22, and supplies lubricating oil from an oil supply pipe 86 connected via a flexible pipe 84 to the work roll chock 22. It is designed to be able to supply internal bearings. Note that the upper work roll side also has the same structure as shown in FIG.

Hydraulic cylinders 40, 40a provided on each guide member.

42.42a is connected to a tuned cylinder 88, which is a tuned actuator, as shown in FIG. The tuned cylinder 88 has two (]0) pressure oil chambers formed in the axial direction of the cylinder body 90, and each pressure oil chamber has the cylinder body 90.
A piston 94 provided on a tuning rod 92 passing through the
．． 96 is the arrangement. The pistons 94 and 96 divide each pressure oil chamber into two chambers. The chamber 98 communicates with the high pressure chamber 48a of the hydraulic cylinder 40a via a conduit 106, and the chamber 100 communicates with the high pressure chamber 50a of the hydraulic cylinder 42a via a conduit 106. Also,
The chamber 102 communicates with a high pressure chamber 48 of the hydraulic cylinder 4o via a conduit 106, and the chamber 104 communicates with a high pressure chamber 50 of the hydraulic cylinder 42 via a conduit 106. A pipe line 106 communicating the high pressure chamber of each hydraulic cylinder and each chamber of the synchronized cylinder 88 is connected to a cutoff valve unit 110 via a pipe 108, and this cutoff valve unit 110 is connected to a cutoff valve unit 110 via a pipe 112. and communicates with the hydraulic pressure generator 114.

On the other hand, the back pressure chambers 52, 52a, 54, 54a of each hydraulic cylinder 40, 40a, 42° 42a are connected to the pipe line 11, respectively.
6, and is connected to the hydraulic pressure generating bag W114 via a pressure reducing unit 120 via piping 118.

A rack 122 is provided at one end of the tuning rod 92 of the tuning cylinder 88 described above. The rack 122 meshes with a pinion 126 provided on the rotating shaft of the Sershin oscillator 124. A control device 128 electrically connected to the Selsyn oscillator 124 receives a signal from the Selsyn oscillator 124 and controls the regulating valve unit 130 .

A drive rod 136 of a drive cylinder 134 is connected to the other side of the tuning rod 92 via a shaft coupling 132. The pressure oil chamber of the drive cylinder 134 is divided into a first pressure oil chamber 140 and a second pressure oil chamber 142 by a piston 138 provided on the drive rod 136. These first and second pressure oil chambers 140 and 142 are connected to the hydraulic pressure generating device 114 via regulating valve units 130, respectively.

The hydraulic pressure chambers of each hydraulic cylinder 40.40a, 42.degree. 42a and the hydraulic pressure chamber of the tuning cylinder 88 are the same in size, and
The pistons 94, 96 are hydraulic cylinders 40, 40a,
42, 42a each piston 44, 44a, 46, 46a
, and the thickness of the tuning rod 92 is the same as that of the piston rods 56, 56a, 58, 58a.

The operation of the embodiment configured as described above is as follows.

The traveling direction of the rolled material 14 is indicated by the arrow 150 in FIG.
As shown in the figure, when facing from the right to the left, the axial center position of the work roll 16.
It is offset by α from the axis center position to the exit side of the rolled material. This is due to the following reason. As shown in FIG. 4, the work rolls 16.18 receive force from the reinforcing rolls 24.26 to be pushed out toward the exit side of the rolled material 14 by a component F of the rolling load P. Also, work roll 1
6.18 is the rolling torque T from the reinforcing roll 24.26
is rotated in the direction of the arrow, and the tangential force Q due to this rolling torque acts in the opposite direction to the component force F of the rolling load P. Therefore, by appropriately selecting the offset amount α, the component force F and the tangential force Q can be balanced, and the horizontal deflection amount of the work rolls 16° and 18 can be adjusted to the minimum value that does not affect the plate shape. becomes.

Next, a method for initializing the roll offset adjusting device according to the above embodiment will be explained.

First, the drive side and work side guide members 3 on the output side of the rolled material
8. Make the tip end surface (guide sliding surface) of 38a parallel to the reference of the roll housing 10 and temporarily fix it. Next, the leading end surface of each guide member 36, 36a provided on the entry side of the material to be rolled is inserted into the guide member 38 through the work roll chock 20.22.
．． 38a, the work roll chocks 20 and 22 control the distance between the tip surfaces of the guide members on the entry side and the exit side.
It is arranged so that it has the minimum value that allows it to slide smoothly in the direction perpendicular to the direction of movement of item 4. The distance between these guide members is
It can be set arbitrarily and can therefore be selected depending on the required amount of clearance between the work roll chock and the guide member. However, it is a matter of course that the value is a value that does not affect the rolling operation.

Next, operate the shutoff valve unit 110 to
, the high pressure chamber 48 of the hydraulic cylinder 40a via the conduit 106.
A and the chamber 98 of the tuning cylinder 88 are supplied with pressure oil, which is a working fluid, at a predetermined pressure to fill them. Thereafter, in the same manner, the high pressure chamber of each hydraulic cylinder and each chamber of the synchronized cylinder 88 are filled with pressure oil, and each high pressure chamber 48, 48a, 50.5
0a and the chambers 98, 100, 102, 104 are completely removed, the pressure in each hydraulic pressure chamber is set to the same predetermined value, and the shutoff valve unit 110 is closed. This creates four independent closed hydraulic circuits consisting of the high pressure chamber of each hydraulic cylinder and the chamber of the tuned cylinder 88. At this time, each hydraulic cylinder 40, 40a, 42, 42
Low-pressure oil from the hydraulic pressure generator 114, which has been reduced in pressure by the pressure reducing unit I-120, is supplied to the back pressure chambers 52 degrees 52a, 54, 54a of the pistons 44, 44a.

46. Apply back pressure to 46a.

After completing the above operations, each guide member 36° 36a,
The temporary fixation of 38 and 38a is released. Even in this released state, each guide member 36, 36a, 38, 3
The balance of the tip surface of 8a is maintained as long as no leakage occurs in each of the closed hydraulic circuits described above. After the temporary fixation of each guide member is released, high-pressure oil is supplied from the hydraulic pressure generator 114 to the first return chamber 140 of the drive cylinder 134 via the adjustment valve unit 130. This causes the drive rod 136 to move to the left in FIG. 1, causing the tuning rod 92 of the tuning cylinder 88 to move to the left. Therefore, the pressure oil in the chambers 100, 104 of the synchronized iron 88 is discharged, and the high pressure chambers 50, 5 of the hydraulic cylinders 42, 42a
0a. At the same time, the volume of the chamber 98° 102 of the tuning cylinder 88 expands, causing the hydraulic cylinders 40, 4
The pressure oil in the high pressure chamber 48.48a of 0a is transferred to the hydraulic cylinder 42.
．． The same amount as supplied to 42a is sucked. As a result, the hydraulic cylinders 42, 42a on the outlet side of the rolled material, that is, the guide members 38.38a, move to the right in FIG. The hydraulic cylinder 40° 40a on the material input side, that is, the guide portions 36, 3
6a moves to the right. Therefore, one work roll chock 20°22 is held between each guide member and placed on the entry side of the material to be rolled.
Each guide member moves by the amount of movement.

The amount of movement of each moving member is detected as the amount of movement of the tuning rod 92 of the tuning cylinder 88. That is, the hydraulic chamber, piston, and tuning iron of the tuning cylinder 88 are formed to have the same dimensions as each hydraulic cylinder, and the tuning cylinder 88
The amount of movement of the tuning rod 92 of each hydraulic cylinder 40, 4 is
0a, equal to the amount of movement of 42 degrees 42a. Then, when the tuning rod 92 moves, the rack 122 provided at one end of the tuning rod 92 rotates the binion 126, and the Celsyn oscillator 124 inputs a signal synchronized with the rotation of the binion 126 to the control device 128. The control device 128 detects the position of each guide member, i.e. the work roll 16.18, by the signal of the Sersin oscillator 124, and controls the drive cylinder force 94/ via the regulating valve unit 130 to control the work roll 16.18. Stop at a designated position. This causes the work roll 16.18 to be offset by a predetermined amount with respect to the reinforcing roll 24.26.

When the work rolls 16, 18 are moved in the direction of the exit side of the rolled material, this is done in the same manner as above by supplying pressure oil to the second scab chamber 142 of the drive cylinder 134, contrary to the above. be able to.

As described above, according to this embodiment, it is possible to simultaneously operate the cylinders provided on the inlet and outlet sides of the rolled material of the work roll via the synchronized cylinder 88, and to make the amount of operation the same. Therefore, it is possible to eliminate deviations in the amount of operation between the cylinders. Therefore, it is possible to eliminate defects in the plate shape due to deviations in parallelism of the rolls due to variations in operation between cylinders, as in conventional roll offset adjusting devices. Moreover, since the movement of each guide member along the direction of rolling material passing is performed using the drive cylinder 134, accurate positioning and rapid movement can be performed, even if the amount of offset is several tens of layers. , adjustments can be made within seconds. As a result, the work roll 1 is placed on the inlet side or outlet side of the rolled material of the reinforcing rolls 24 and 26.
It is possible to improve the performance of reversing rolling mills that require switching 6.18 offsets.

That is, in a reversible rolling mill that handles coiled plate materials, the direction of sheet passing of the material to be rolled 14 is switched. Along with this switching of the sheet passing direction, it is also necessary to switch the offset position of the work rolls 16, 18.

The switching time is generally within 30 seconds, and the shorter the switching time, the higher the efficiency and precision of the rolling mill. This is because if the offset switching time is long, not only will the production operation rate decrease, but also because rolling mills that use small diameter work rolls have a relatively small heat capacity, the temperature change of the work rolls 16 and 18 will The thermal crown changes, causing problems such as difficulty in rolling the material 14 to be rolled or an increase in the range of defective shapes at the tip, making it impossible to roll materials whose shape is subject to strict control. Therefore, as in this example,
The drive cylinder 134 allows the offset to be changed easily and quickly, providing a highly accurate reversible rolling mill and facilitating automation.

In addition, in this embodiment, each guide member 36° 36a, 38,
Since the position of the roll 38b, that is, the position of the work roll 16.18 can be detected and controlled, it is easy to center the work roll 16.18 at the center of the rolling mill (zero offset). And shutoff valve unit 1
By operating 10, the distance between each guide member and the work roll bearing box can be easily adjusted to the size required for the roll recombination work.

Furthermore, in the Akemi travel example, the guide member 36 on the driving side.
38, the oil supply port 82 provided in the work roll bearing box on the drive side and the oil supply pipe 86 are connected via the flexible pipe 84. Also, there will be no oil leakage.

Note that unforeseen accidents such as breakage of the rolled material 14 or breakage of the rolls may occur during rolling, and in such cases, an abnormal load is often applied to the work roll chocks 20 and 22, and the work is interrupted. This may damage the sides of the roll chock 20.22. Therefore, each hydraulic cylinder 40, 4. shown in FIG. 1 of this embodiment. Oa, 42, 42
For example, a shutoff valve unit 1 is installed in the closed hydraulic circuit of a.
If a safety valve that operates when a predetermined pressure is applied is installed on the secondary side of the 10, this safety valve will operate when an abnormal load is applied to the side of the chock, and the closed hydraulic circuit will be closed. Since the pressure oil is released to the outside, it is possible to prevent damage to the sides of the work roll chock and the end surfaces of each guide member.

In the embodiments described above, a reversible rolling mill has been described, but the present invention can also be applied to other rolling mills. In addition, although a four-high rolling mill has been described in the above embodiment, as shown in FIG.
The work roll of the six-high rolling mill in which the rollers 4 are arranged can also be used as an offset adjustment device. Further, it can also be applied as a device for adjusting the offset amount of the intermediate rolls 152, 154, which can exhibit the same offset effect as the offset of the work rolls.

〔Effect of the invention〕

As explained above, according to the present invention, the hydraulic cylinders that advance and retreat the guide members provided on the inlet and outlet sides of the rolled material of the work roll bearing box are simultaneously driven by the same amount using the synchronized actuators. By doing so, the offset amount can be arbitrarily and quickly adjusted.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a hydraulic circuit showing an embodiment of a roll offset adjustment device for a rolling mill according to the present invention, and FIG. 2 is an explanation of main parts of a rolling mill equipped with a roll offset adjustment device according to an embodiment of the present invention. Figure 3 is a sectional view taken along the line ■-■ in Figure 2, Figure 4 is an explanatory diagram of the relationship between roll offset I/amount and rolling load, and Figure 5 is a roll offset according to an embodiment of the present invention. It is an explanatory view when an adjustment device is applied to a 6-high rolling mill. 14... Rolled material, 16.18... Work roll, 2
0゜22.22a...Work roll chock, 24.2
6... Reinforcement roll, 36.36a, 38.38a...
・Guiding member, 40, 40a, 42, 42a
- Hydraulic cylinder, 88... Synchronized actuator (synchronized cylinder), 110... Shutoff valve unit, "-14...
Hydraulic pressure generator, 120...pressure reduction unit 1-. 124・
・Selsin oscillator, 128...control device, 130...
- Adjustment valve unit, 134... drive cylinder.

Claims (1)

[Scope of Claims] 1. A guide that is brought into contact with one side and the other side in the direction of movement of the rolled material of a bearing box that rotatably supports a work roll disposed between a pair of reinforcing rolls. A hydraulic cylinder that moves each of these guide members forward and backward along the traveling direction of the rolled material; At the same time, supplying working fluid to one of these hydraulic cylinders, one hydraulic cylinder A roll offset adjustment device for a rolling mill, comprising: a synchronized actuator that discharges working fluid from the other liquid cylinder in an amount equal to the amount of working fluid supplied to the other liquid cylinder. 2. In claim 1: Each hydraulic cylinder has a high pressure chamber and a back pressure chamber; The synchronized actuator has a chamber communicating with the high pressure chamber of either one of the hydraulic cylinders. , a synchronized cylinder having a chamber partitioned from this chamber via a piston and communicating with a high pressure chamber of the other hydraulic cylinder; a roll offset adjustment device for a rolling mill.