JPH0527484B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rolling mill rolling control method and rolling machine.

(Prior art) Conventional rolling mill rolling mills have two types of rolling mills: one in which the rolling distance can be set by adjusting the distance between the rolls only under no-load conditions, and the other in which the distance between the rolls can be adjusted even under load conditions during rolling. In some cases, the reduction amount can be changed at any time.

(Problem to be solved by the invention) Conventional rolling mills that can set the distance between the rolls only under no load have the advantage of having a simple structure and low price, but it is difficult to adjust the distance between the rolls under load. On the other hand, a rolling mill that can adjust the distance between rolls even under load has a good rolled plate thickness accuracy, but has a complicated structure. The drawback was the high price.

(Means for Solving the Problems) The present invention provides a rolling device with a simple structure that can adjust the distance between rolls even during rolling, and a rolling control method for a rolling mill that employs the rolling device. Its composition is as follows.

The rolling mill's rolling control method involves rotating the rolling screw screws that are respectively screwed into a pair of rolling screw nuts fixed to the housing, and then rolling down each bearing at both ends of the back-up roll through a pressure plate. An oil groove for supplying lubricating oil to the upper wedge and the lower wedge is interposed between the pressure plate and the bearing of the rolling mill that presses in the axial direction and adjusts the distance between the rolls of a pair of work rolls. The upper wedge is housed in the frame so that it can only move vertically relative to each other, and the lower wedge is housed on the bottom of the frame so that it can only move horizontally. A pair of actuators are installed facing each other so as to protrude inward, each having an oil passage, and are slidably inserted into circular holes at both left and right ends of the lower wedge to partition a hydraulic chamber. An auxiliary lowering device is interposed in which the lower wedge is given left-right movement in a direction orthogonal to the axis, and the upper wedge is moved up and down in the axial direction, the frame is placed on the bearing of the back-up roll, and the pressure is increased. placing a plate on top of the upper wedge;
Using a rolling mill that allows fine adjustment of the distance between the rolls, the thickness of the rolled material at both ends in the direction orthogonal to the feed direction after rolling with a pair of work rolls is measured using a pair of outlet-side plate thickness detection sensors. The plate thickness control device compares this detection signal with a set value based on the set thickness of the rolled material, and based on the comparison result, actuators of the auxiliary rolling device are individually actuated to reduce the thickness between the rolls. This is a rolling mill reduction control method that finely adjusts the rolling mill.

In addition, the lowering device rotates the lowering screw screws that are respectively screwed into a pair of lowering screw nuts fixed to the housing, and aligns each bearing at both ends of the back-up roll with the axis of the lowering screw screw through a pressure plate. A rolling mill that adjusts the distance between a pair of work rolls by pressing in a direction, and an oil that lubricates an upper wedge and a lower wedge between the pressure plate and the bearing of the back-up roll. The upper wedge is housed in the frame so that it can only move vertically relative to each other while the upper wedge is stacked on top of the other with an inclined surface having a groove interposed therebetween, and the lower wedge is housed on the bottom of the frame body so that it can only move horizontally. A pair of actuators that are installed facing each other so as to protrude inward from the frame, each having an oil passage and slidably fitting into a circular hole at both left and right ends of the lower wedge to partition a hydraulic chamber. In this rolling mill rolling machine, an auxiliary rolling down device is interposed, the frame body is disposed on the bearing of the back-up roll, and the pressure plate is disposed on the upper wedge.

(Function) According to the rolling mill reduction control method, the reduction screw screw is rotated in a no-load state to give a predetermined distance between the pair of work rolls, and during rolling,
When the thickness of the rolled material changes, the thickness is determined at both ends in the direction perpendicular to the feeding direction of the rolled material, and the distance between the rolls is automatically adjusted. Ensure constant thickness. In addition, in the rolling mill's rolling machine, the rolling screw screw is rotated under no load, and the bearing of the back-up roll is pressed through the pressure plate, so that the rolling force between the pair of work rolls is
Adjust and start rolling work. If it is necessary to finely adjust the distance between the rolls during rolling, the actuator is activated to move the frame up and down by moving the lower wedge, and the bearings of the back-up rolls can be moved up and down. The work roll can be moved up and down in the axial direction of the screw screw to adjust the distance between the rolls. Between roles like this
When adjusting the auxiliary lowering device, if the lower wedge is moved left and right on the bottom of the frame by the operation of a pair of actuators, the upper wedge is guided by the side wall of the frame and moves up and down, and the frame The distance between the bottom of the wedge and the top of the upper wedge increases or decreases. In this way, the amount of reduction of the bearings on both sides of the back-up roll is finely adjusted by moving the respective lower wedges from side to side. In addition, by supplying lubricating oil to the oil groove interposed in the slope between the upper wedge and the lower wedge,
The lower wedge can be smoothly moved left and right with respect to the upper wedge, and the lubricating oil that leaks and is stored at the bottom of the frame also makes the lower wedge move smoothly left and right.

(Embodiment) An embodiment of the rolling mill reduction control device according to the present invention will be described based on FIGS. 1 and 2.

Work rolls 1 and 1' are supported by a pair of bearings 1a and 1'a, respectively. 2,
Reference numeral 2' indicates a back-up roll, which is supported by a pair of bearings 2a and 2'a, respectively. 3 shows the housing of the rolling mill, in which each rolling screw nut 4, 4 is fixed, and the bearing 2a of the upper back-up roll 2 and the bearings 1a, 1'a of both work rolls 1, 1' are connected to the lower one. It is supported so as to be movable up and down relative to the bearing 2'a of the back-up roll 2'.
Each numeral 5 is a reduction screw screw screwed into each reduction screw nut 4, 4, and each 6 is a pressure plate. The above configuration is no different from the configuration of a conventional rolling mill in which the distance between the rolls can be set only in a no-load state.

Therefore, the adjustment between the rolls in a no-load state is achieved by driving an electric motor (not shown) to rotate both lower screw screws 5, 5 to move them up and down in the axial direction, and through each pressure plate 6, 6. Press each bearing 2a, 2a,
This is done by displacing the upper backup roll 2.

Each 7 is an auxiliary lowering device interposed between each pressure plate 6, 6 and each bearing 2a, 2a of the backup roll. This will be explained in detail based on FIG.
8 is a frame having an upper opening. Reference numeral 9 denotes an upper wedge, which is housed within the frame 8 so as to be able to move only relative up and down. 10 is housed in the frame 8 so that its inclined upper surface can slide against the inclined lower surface of the upper wedge 9, and is placed on the bottom of the frame 8 in the direction perpendicular to the axis of the screw-down screw 5, that is, in the figure. It is a lower wedge that can only be moved left and right, and there are circular holes on both sides.
It has 0a and 10a. Reference numerals 11 and 11' denote cylindrical rams that are slidably fitted into the respective circular holes 10a and 10a, and one end is fixed to the inner surface of the side wall of the frame 8, and the other end is open and has an oil passage. However, the packing 13 interposed on the outer periphery maintains liquid tightness with the circular hole 10a. Thus,
Hydraulic chambers are defined between rams 11, 11' attached to the frame 8 so as to project inwardly and facing each other, and circular holes 10a, 10a at both left and right ends of the lower wedge 10, respectively. 12a and 12'a are oil pipes for supplying and discharging pressure oil to and from the respective rams 11 and 11', which pass through the opposing side walls of the frame 8 and form the insides of the cylindrical rams 11 and 11'. Connect to oil line. Further, an oil groove 10b is provided on the sliding inclined surface of the lower wedge 10, and the lubricating oil supplied from the outside through the oil supply pipe 14a passes through the oil groove 10b and is discharged from the oil drain pipe 14b. The sliding friction surfaces between 9 and the lower wedge 10 are lubricated. The oil supply pipe 14a and the oil drain pipe 14b have flexibility. Further, a portion of the lubricating oil leaking from the oil groove 10b accumulates at the bottom of the frame 8 and lubricates the left and right movement of the lower wedge 10. Note that the oil groove 10b only needs to be located on the inclined surface between the upper wedge 9 and the lower wedge 10,
It is also possible to form an upper wedge 9.

As described above, the circular holes 10a, 10a and the rams 11, 11' constitute a pair of actuators 15, 15 that reciprocate the lower wedge 10.

Next, the operation of the device will be explained.

If pressure oil is supplied to one ram 11 through the oil pipe 12a, and pressure oil from the other ram 11' is discharged through the oil pipe 12'a, the lower wedge 10 moves to the left in the figure, and the upper wedge 9 The frame body 8 slidably guided on the side is lowered. Also, if pressure oil is supplied to the other ram 11' from the oil pipe 12'a, and the pressure oil from one ram 11 is discharged from the oil pipe 12a, the lower wedge 10
moves to the right in the figure to enable the frame 8 to rise. In this way, the actuators 15, 15 of both the auxiliary lowering devices 7, 7 are actuated individually,
Each of the bearings 2a, 2a, as well as each of the bearings 1a, 1a of the work rolls, can be lowered or raised individually, and the distance between the pair of work rolls 1, 1' can be finely adjusted in an auxiliary manner.

Next, control of the auxiliary lowering device having the above configuration will be explained.

In Fig. 1, A is a rolled material, and each 20 is
For example, an outlet side plate thickness detection sensor is constructed by sandwiching the rolled material A immediately after rolling between a pair of eddy current displacement transducers, and the placed above and below. Then, from the sum of the displacements of the rolled material A with respect to the upper and lower displacement transducers arranged on one side of the rolled material A, the variation in the thickness of the rolled material A can be ascertained. The plate thickness is detected by a pair of outlet side plate thickness detection sensors 20, 20, and the detection signals are sent to each plate thickness control device 21, 21, respectively, and compared with a set value set according to the required thickness after rolling. Then, an instruction signal based on the comparison result is sent to each hydraulic servo device 22, 22. The hydraulic servo device 22 includes (a) one oil pipe 12a;
(b) simultaneously supplying pressure oil to the other oil pipe 12'a, discharging pressure oil from one oil pipe 12a; (c) discharging pressure oil from one oil pipe 12a at the same time as supplying pressure oil to the other oil pipe 12'a 12a, 12'a, for example, as shown in FIG.
It is composed of a 4-way solenoid valve 23 with a spring center and 3 positions.
Each solenoid valve 23 acts based on the instruction signal given to the control unit (SOL) of each solenoid valve 23 of the hydraulic servo device 22, and when the thickness of the rolled material A is thinner than the set value, the oil pipe 12 Pressure oil is sent to 'a by a pump 24, and if it is thick, pressure oil is sent to the oil pipe 12a, and the frame body 8 is moved up and down by the left and right movement of the lower wedge 10, and the amount of reduction can be finely adjusted. done automatically,
A rolled material A having the required thickness is obtained. When the thickness of the rolled material A matches the set value, there is no instruction signal to the hydraulic servo device 22, the solenoid valve 23 takes the neutral position shown in FIG. 3, and both oil pipes 12a, 12'a are closed. It is in a state of blockage.

As described above, the thickness accuracy of the rolled material A after rolling is ensured by automatically adjusting the distance between the rolls on both sides of the rolled material A in the direction perpendicular to the feeding direction.

(Effects of the Invention) As understood from the above explanation, according to the present invention, a wedge-shaped auxiliary rolling device with a simple structure can be added to a conventional rolling mill that can set the distance between rolls only in a no-load state. By adding , it is possible to easily finely adjust the distance between the rolls under load conditions, and it is possible to provide a rolling mill that is inexpensive and can produce rolled materials with extremely good plate thickness accuracy. Also, by automatically making fine adjustments to the distance between the rolls, the thickness accuracy of the rolled material can now be ensured. In addition, in each auxiliary rolling device, a pair of actuators are mounted compactly facing the frame, making it relatively lightweight and distributing the weight to the left and right, so that vibrations associated with rolling operations are not applied to the auxiliary rolling device. The effects of action are reduced. Furthermore, it is reliably prevented that lateral forces are applied to the members located above and below the auxiliary lowering device, that is, the bearings of the pressure plate and the back-up roll. As a result, the durability of the rolling mill is improved.

Since the lower wedge is placed on the bottom and housed in the frame, even if the lubricating oil supplied to the oil groove on the slope between the upper and lower wedges leaks from the slope, Lubricating oil is stored within the frame. Therefore, there is no risk of staining the area around the rolling mill.

Furthermore, since a circular hole functioning as a cylinder is formed in the lower wedge, the structure of the actuator of the auxiliary lowering device is simpler than in the case where a ram is formed in the lower wedge. Of course, compared to the case with a double-acting cylinder device, the structure is simpler,
The same amount of movement of the lower wedge in both left and right directions can be easily provided with the same amount of oil.

Furthermore, according to the rolling mill reduction control method, the thickness of the rolled material after being rolled by a pair of work rolls is detected by a pair of exit side plate thickness detection sensors, and this detection signal and the set thickness of the rolled material are detected. Based on the comparison result, the actuator is operated to finely adjust the roll distance. As a result, in combination with detecting the thickness of both sides in the direction perpendicular to the feeding direction and operating the auxiliary rolling devices individually, the thickness of the rolled material after rolling is ensured extremely accurately.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a rolling mill rolling device according to the present invention, FIG. 2 is a sectional view of a wedge-shaped auxiliary rolling device used in the embodiment, and FIG. It is a figure showing an example of hydraulic piping of the hydraulic servo device used. 1, 1': Work roll, 2, 2': Backup roll, 2a: Bearing (of backup roll),
3: Housing, 4: Drop screw nut,
5: Lowering screw screw, 6: Pressure plate, 7: Wedge-shaped auxiliary lowering device, 8: Frame, 9: Upper wedge,
10: Lower wedge, 10a: Circular hole, 11,1
1': Ram, 12a, 12'a: Oil pipe, 15: Actuator, 20: Outlet side plate thickness detection center, 2
1: Plate thickness control device, 22: Hydraulic servo device.

Claims (1)

[Scope of Claims] 1. Rotate the lowering screw screws that are respectively screwed into a pair of lowering screw nuts fixed to the housing, and rotate the respective bearings at both ends of the back-up roll through the pressure plates so that the axis of the lowering screw screws An oil groove for supplying lubricating oil to the upper wedge and the lower wedge is interposed between the pressure plate and the bearing of the rolling mill for pressing in the direction and adjusting the distance between the pair of work rolls. The upper wedge is housed in the frame so that it can only move up and down relative to each other, while the lower wedge is housed on the bottom of the frame so that it can only move horizontally. The lower wedge is operated by a pair of actuators, each of which has a ram, each with an oil passage, slidably inserted into a circular hole at both left and right ends of the lower wedge to partition a hydraulic chamber. An auxiliary lowering device is interposed in which the upper wedge is moved up and down in the axial direction by giving left and right movement in a direction orthogonal to the axis, the frame is placed on the bearing of the back-up roll, and the pressure plate is moved in the direction perpendicular to the axis. Place it on top of the top wedge.
Using a rolling mill that allows fine adjustment of the distance between the rolls, the thickness of the rolled material at both ends in the direction orthogonal to the feed direction after rolling with a pair of work rolls is measured using a pair of outlet-side plate thickness detection sensors. The plate thickness control device compares this detection signal with a set value based on the set thickness of the rolled material, and based on the comparison result, actuators of the auxiliary rolling device are individually actuated to reduce the thickness between the rolls. A rolling mill reduction control method characterized by finely adjusting the rolling mill. 2 Rotate the lowering screw screws that are respectively screwed into a pair of lowering screw nuts fixed to the housing, and press each bearing at both ends of the back-up roll in the axial direction of the lowering screw screws through the pressure plate, respectively. A rolling mill for adjusting the distance between the work rolls of the work roll, the inclined surface having an oil groove interposed between the pressure plate and the bearing of the back-up roll to supply lubricating oil to the upper wedge and the lower wedge. The upper wedge is housed in the frame so that it can only move up and down relative to each other, while the lower wedge is housed on the bottom of the frame so that it can only move left and right, and the wedge is placed inside the frame. The auxiliary lowering device has a pair of actuators that are installed facing each other so as to protrude and each has an oil passage and is slidably inserted into a circular hole at both left and right ends of a lower wedge to partition a hydraulic chamber. A rolling machine for a rolling mill, characterized in that the frame body is disposed on a bearing of the back-up roll, and the pressure plate is disposed on the upper wedge.