JP2930469B2 - Work roll chock position stabilizer for cross roll rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work roll chock position stabilizing device for stabilizing a position of a work roll chock in a cross roll rolling mill in a horizontal direction perpendicular to a roll axis direction.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing a main part of a conventional work roll cross rolling mill which crosses only upper and lower work rolls, and FIG. 6 is a conceptual plan view showing horizontal forces acting on the upper and lower work rolls. In both figures, reference numeral 51 denotes an upper work roll, 52 denotes a lower work roll, and both ends thereof are pivoted on an upper work roll chock 55 and a lower work roll chock 56 which are supported by the upper and lower crossheads 61 and 62 in the housing 60 so as to be able to move up and down. Is being worn.

[0005] 53 is an upper backup roll and 54 is a lower backup roll.
The upper backup roll chock 57 and the lower backup roll chock 58 in the shaft 0
C4 is shifted (offset) from the center C of the rolling mill to the entry side A by an offset amount a, and the upper and lower axes C3, C4
Are parallel to each other.

Reference numeral 65 denotes a right-handed upper shaft, and 67 denotes a left-handed lower shaft, which are screwed into nuts 66 and 68 embedded on the inlet side A and the outlet side B of the housing 60, respectively. , 62 are rotatably connected. The motor is rotated via a shaft 64 and a worm speed reducer 63 by a motor (not shown).

The upper crosshead 61 and the lower crosshead 62 are moved in parallel directions opposite to each other by rotating the upper and lower shafts 65 and 67, and the upper work roll chock 55 and the upper work roll 51, the lower work roll chock 56 and the lower The work roll 52 is rotated in a direction opposite to each other at a required cross angle θ about a center point (cross point) 0 in the roll axis direction, and the upper work roll 51 and the lower work roll 52 are crossed to form a rolling mill. Roll 50.

During rolling, the upper and lower backup rolls 53,5
Work roll chock 5
5 and 56 are pressed against the upper and lower crossheads 61 and 62 on the delivery side B to prevent horizontal runout orthogonal to the roll axis direction and stabilize the position. Therefore, a gap x is generated between the upper and lower work roll chocks 55 and 56 and the upper and lower crossheads 61 and 62 on the entry side A.

Furthermore, depending on its cross vertically the work rolls 51 and 52, horizontal force to be enlarged cross angle theta (crotch tear force) F _M is generated, the crotch tear force F _M is
As shown in FIG. 6, it becomes larger as approaching both ends. Therefore, the upper and lower work rolls 51 and 52 have the configuration shown in FIG.
As shown in, offset force F, the rolling material tension T and crotch tear force F _M acts.

[0008]

SUMMARY OF THE INVENTION Upper and lower work rolls 5
In 1, 52 only the work roll cross rolling mill to be cross, the crotch tear force F _M to be generated between the upper work roll 51 and lower work rolls 52, between the upper work roll 51 and upper backup roll 53 and the lower Crotch force F generated between work roll 52 and lower backup roll 54
_{Since M} is added, the total of the crotch force F _M acting on the upper and lower work rolls 51 and 52 becomes large.

[0009] In the example of FIG. 6, the drive side D of the working side W and the lower work roll 52 of the upper work roll 51, the crotch tear force F _M in the reverse direction acts as an offset component force F and rolled rod tension T Therefore, F _M ≧ F + T depending on the rolling conditions. In the upper work roll 51, the sum of the horizontal component forces (F + T−F _M ) of the working side W is equal to the sum of the horizontal component forces (F + T−F _M ) of the drive side D.
+ T + F _M ), and in the lower work roll 52, the horizontal component force of the work side W and the drive side D in the roll axis direction about the cross point 0 becomes unequal.
Therefore, the upper and lower work rolls 51 and 52 may run out in the rolling direction, and the roll gap between the upper and lower work rolls 51 and 52 fluctuates between the work side W and the drive side D. Defective plate shape occurs.

[0010]

Means for Solving the Problems The structure of the work roll chock position stabilizing device of the cross roll rolling mill according to the present invention for solving the above problems is as follows.

[0011] In a cross roll rolling mill for crossing the upper and lower work rolls together with the upper and lower work roll chocks so that their roll axes cross each other in a plane parallel to the rolled plate surface, a cross roll rolling mill on the entrance or exit side of the upper and lower work roll chock is provided. It is characterized by comprising a fixed position holding device for supporting one side surface at a fixed position in a horizontal direction perpendicular to the roll axis direction, and a constant pressure pressing device for pressing the upper and lower work roll chocks against the fixed position holding device.

2. A hydraulic cylinder according to claim 1, wherein one side of said upper or lower work roll chock is supported at a fixed position in a horizontal direction perpendicular to the roll axis direction, and said hydraulic cylinder is supported by said hydraulic cylinder. It is characterized by comprising a fixed position control device for keeping the position of the part constant, and a liquid pressure cylinder for pressing the other side surface of the upper and lower work roll chocks with a constant pressure.

A holding member for supporting one side of the upper or lower work roll chock on an entrance side or an exit side at a fixed position in a horizontal direction perpendicular to the roll axis direction, and the holding member is mounted in the roll axis direction. A wedge for moving the wedge in a horizontal direction perpendicular to the roll axis, a wedge moving device for reciprocating the wedge in a roll axis direction or a vertical direction perpendicular to the roll axis direction, and a fixed position control for keeping a position of a support portion of the holding member constant. An apparatus and a fluid pressure cylinder for pressing the other side surface of the upper and lower work rolls with a constant pressure are provided.

[0014]

According to the first aspect of the present invention, when rolling the rolled material, one of the side surfaces of the upper and lower work roll chocks is supported at a predetermined position in the horizontal direction orthogonal to the roll axis direction by the fixed position holding device. , From the other side, by a pressing device, the upper and lower work roll chock presses at a constant pressure capable of ascending and descending for work roll bending,
This prevents roll gap fluctuations at both ends of the upper and lower work rolls due to horizontal run-out perpendicular to the roll axis direction of the upper and lower work rolls.

According to the second aspect of the present invention, when rolling the rolled material, one side of the upper or lower side of the upper and lower work roll chock is supported by a liquid pressure cylinder at a predetermined position in a horizontal direction orthogonal to the roll axis direction. , From the other side,
The upper and lower work roll chocks are pressed by a liquid pressure cylinder at a constant pressure capable of moving up and down. During rolling, the fluctuation of the one side surface of the upper and lower work rolls from the predetermined position is detected and corrected by the fixed position control device and the liquid pressure cylinder, and the horizontal run-out orthogonal to the roll axis direction of the upper and lower work rolls. To prevent the roll gap from fluctuating at both ends.

According to the third aspect of the present invention, when rolling the rolled material, one side of the upper or lower work roll chock is supported at a predetermined position in a horizontal direction orthogonal to the roll axis direction by a holding member, From the other side, the upper and lower work roll chocks are pressed by a liquid pressure cylinder with a constant pressure that can be raised and lowered. During rolling, the fixed position control device detects a change from the predetermined position on the one side surface of the upper and lower work roll chock, and when the position changes, the wedge is moved in the roll axis direction or the roll axis direction by the wedge moving device. By moving the holding member in the horizontal direction perpendicular to the roll axis direction by moving the holding member in the perpendicular direction perpendicular to the roll axis direction, the position of the one side surface of the upper and lower work roll chock is corrected from the predetermined position, and the upper and lower work roll rolls are corrected. This prevents roll gap fluctuations at both ends due to horizontal run-out perpendicular to the axial direction.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. The same members and parts as those of the conventional device are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a side view showing a main part of a work roll cross rolling mill for crossing only work rolls according to a first embodiment, FIG. 2 is a block diagram showing a configuration of a control device of FIG. 1, and FIG. It is a flowchart which shows the control procedure of No. 2.

In FIG. 1, reference numeral 1 denotes an upper hydraulic cylinder, and 3 denotes a lower hydraulic cylinder. The lower hydraulic cylinder is mounted on a side surface of an outlet side B of a housing 60, and its rods 2 and 4 are attached to upper and lower crossheads 61 and 62 on the outlet side B. Each one is connected. 5 is an upper position detector and 6 is a lower position detector.
The target rods 2a, 4a mounted on the head side of 3 and integrated with the rods 2, 4 respectively penetrate therethrough.

7 is an upper servo valve, 8 is a lower servo valve,
The upper and lower hydraulic cylinders 1 and 3 and a hydraulic device (not shown) are connected to the control device 10. Reference numeral 11 denotes a hydraulic cylinder for pressing a constant pressure, which is mounted on the side of the entrance A of the housing 60, and whose rod 12 is connected to the upper and lower crossheads 6 of the entrance A.
1, 62 respectively. The head side of the hydraulic cylinder 11 is connected to a hydraulic device (not shown) via a relief valve 13, a check valve 14, and a pressure regulating valve 15.

As shown in FIG. 2, the control device 10 includes a detection position comparing section 41 to which the upper position detector 5 is connected, a reference position storage section 45, and a servo valve operation instruction to which the upper servo valve 7 is connected. It comprises a unit 43, a detected position comparing unit 42 to which the lower position detector 6 is connected, a reference position storage unit 46, and a servo valve operation instructing unit 44 to which the lower servo valve 7 is connected.

Next, the operation of the present apparatus will be described. The pressure oil adjusted to a predetermined pressure by the pressure regulating valve 15 is supplied to the head side of the hydraulic cylinder 11 on the inlet side A through the check valve 14 and pressurized, and the rod 12 and the upper and lower crossheads 61 and 62 are pressurized.
The upper work roll chock 55 and the lower work roll chock 56 are pressed against the side surface on the entry side A with a pressure capable of moving up and down during roll bending. Then, the upper and lower hydraulic cylinders 1 and 3 on the delivery side B are operated by the upper and lower servo valves 7 and 8 so that the rods 2 and 4 and the upper and lower crossheads 61 and 6 are operated.
2 is set, and the side surfaces of the upper work roll chock 55 and the lower work roll chock 56 on the delivery side B are respectively set at fixed positions. Then, the reference position of each target rod 2a, 4a is detected by the vertical position detectors 5, 6,
The information is transmitted to the control device 10 and stored.

During rolling of the rolled material 50, the positions of the target rods 2a and 4a are detected by the vertical position detectors 5 and 6 and transmitted to the control device 10, and when the detected position is displaced from the reference position, the vertical position is detected. Work roll 55,5
6, the control unit 10 operates the upper and lower hydraulic cylinders 1 and 3 via the upper and lower servo valves 7 and 8, respectively, so that the position returns to the original position. , 56 are held at the fixed positions.

When the upper and lower hydraulic cylinders 1 and 3 on the outlet side B are operated, the rod 12 of the hydraulic cylinder 11 on the inlet side A also moves, so that the head side oil chamber also contracts or expands. The oil pressure in the head side oil chamber is kept constant by the valve 14 or the pressure regulating valve 15 and the check valve 14.

The above-mentioned vertical position detectors 5, 6, the vertical servo valves 7, 8, the control device 10, and the vertical hydraulic cylinders 1, 3
The procedure of the position stabilization control of the upper and lower work rolls 55 and 56 according to the flowchart shown in FIG.

FIG. 4 is a side view showing a main part of a work roll cloth rolling mill according to a second embodiment.

The second embodiment is different from the first embodiment in that the vertical hydraulic cylinders 1, 3, rods 2, 4, target rods 2a, 4a and vertical position detectors 5, 6 on the outlet side B are replaced with end portions. Are formed on the upper and lower bars 22 and 24 and the targets 22a and 24a implanted on the upper and lower bars 22 and 24, respectively.
And upper and lower wedges 29, 30 formed at the same gradient as the ends of the upper and lower bars 22, 24 and rising and lowering in the wedge guides 31, 32, and connected to the upper and lower wedges 29, 30 and the upper and lower servo valves 7, 8. Vertical hydraulic cylinders 21, 23
And upper and lower position detectors 25 and 26 disposed on the side surface on the outlet side B of the housing 60. Other configurations and operations are the same as those of the first embodiment.

During the rolling of the rolled material 50, the vertical position detector 2
5 and 26, the positions of the target rods 22a and 24a are detected. When the detected position is displaced from the reference position, the upper and lower hydraulic cylinders 21 and 23 are returned in the same manner as in the first embodiment. Is operated to raise and lower the upper and lower wedges 29, 30 to move the upper and lower bars 22, 24 in the horizontal direction.

The present invention is not limited to the above-described first and second embodiments. The upper work roll 51, the upper backup roll 53, and the lower work roll 5
The present invention is also applicable to a pair cross roll rolling mill in which the second and lower backup rolls 54 are crossed in pairs.

The present invention can be applied even if the upper and lower backup rolls 52, 54 are not offset from the upper and lower work rolls 51, 52. Further, the side surfaces on the entrance side A of the upper and lower work roll chocks 55 and 56 may be supported at predetermined positions, and the side surfaces on the exit side B may be pressed with a constant pressure.

[0031]

According to the first aspect of the present invention, even if the crotch force for increasing the cross angle between the upper and lower work rolls is increased, any one of the horizontal directions perpendicular to the roll axis direction of the upper and lower work roll chocks is provided. By supporting the side surface at a predetermined position and pressing the other side surface at a constant pressure, it is possible to prevent the swing of the upper and lower work roll chock due to uneven horizontal force at both ends of the upper and lower work rolls, It is possible to prevent the occurrence of a plate shape defect such as a plate wedge of a material.

According to the second aspect of the present invention, the use of the fluid pressure cylinder for the fixed position holding device and the constant pressure pressing device enables the device to be used also as a cross roll drive device, and a backlash generated in a mechanical drive device. Can be eliminated.

According to the third aspect of the present invention, the use of the wedge for the fixed position holding device increases the deceleration effect, so that the upper and lower work roll chock can be more stably supported at the fixed position. The position control accuracy is also improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a cross roll rolling mill according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a control device according to the first embodiment.

FIG. 3 is a flowchart showing a position control procedure according to the first embodiment.

FIG. 4 is a side view showing a main part of a cross roll rolling mill according to a second embodiment of the present invention.

FIG. 5 is a side view showing a main part of a conventional cross roll rolling mill.

FIG. 6 is a conceptual plan view showing horizontal forces acting on upper and lower work rolls.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper hydraulic cylinder 2a Upper target rod 3 Lower hydraulic cylinder 4a Lower target rod 5 Upper position detector 6 Lower position detector 7 Upper servo valve 8 Lower servo valve 10 Control device 11 Hydraulic cylinder 21 Upper hydraulic cylinder 22 Upper bar 22a Upper target 23 Lower Hydraulic Cylinder 24 Lower Bar 24a Lower Target 25 Upper Position Detector 26 Lower Position Detector 29 Upper Wedge 30 Lower Wedge 50 Rolled Material 51 Upper Work Roll 52 Lower Work Roll 55 Upper Work Roll Chock 56 Lower Work Roll Chock 61 Upper Crosshead 62 Lower crosshead A Inlet B Outlet θ Cross angle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 1 / 22,13 / 14 B21B 31 / 02,31 / 16

Claims (3)

(57) [Claims] 1. A cross roll rolling mill for crossing upper and lower work rolls together with upper and lower work roll chocks so that their roll axes cross each other in a plane parallel to the rolled plate surface, wherein the upper and lower work roll chocks enter or exit. A fixed position holding device for supporting one side of the side at a fixed position in a horizontal direction perpendicular to the roll axis direction, and a constant pressure pressing device for pressing the upper and lower work roll chock to the fixed position holding device. Work roll chock position stabilizer for cross roll rolling mill. 2. The hydraulic cylinder according to claim 1, wherein one of the side surfaces of the upper and lower work roll chocks is supported at a fixed position in a horizontal direction orthogonal to the roll axis direction. A fixed position control device for holding the position of the support portion constant, and a liquid pressure cylinder for pressing the other side surface of the upper and lower work roll chocks with a constant pressure. Position stabilizer. 3. The holding device according to claim 1, wherein one side of the upper or lower work roll chock is supported at a fixed position in a horizontal direction orthogonal to a roll axis direction, and the holding member is a roll. A wedge for moving the wedge in a horizontal direction perpendicular to the axial direction, a wedge moving device for reciprocating the wedge in a roll axis direction or a vertical direction perpendicular to the roll axis direction, and a wedge for holding the position of the support portion of the holding member constant. A work roll chock position stabilizing device for a cross roll rolling mill, comprising: a position control device; and a fluid pressure cylinder for pressing the other side surface of the upper and lower work rolls at a constant pressure.