JPS637842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work roll bending cylinder device for a roll cross rolling mill.

One type of roll chock for a roll cross rolling mill is a separate type as shown in FIG.
This roll chock includes an upper cylinder block 2, an intermediate cylinder block 3, and a lower cylinder block 4 in the center of a housing 1, and an upper work roll balance bending cylinder 5 and a lower work roll contact bend at the upper and lower parts of the intermediate cylinder block 3. An upper work roll bending cylinder 6 is installed in the lower part of the upper cylinder block 2, a lower work roll bending cylinder 8 is installed in the upper part of the lower cylinder block 4, and an upper work roll supporting the upper work roll 9 is installed. The lower work roll chock 14, which supports the lower work roll 13 while holding the chock 10 between the rods 11 and 12 of the bending cylinders 5 and 7, is connected to the bending cylinders 6 and 7.
8, and these bending cylinders 5, 7 and 6, 8 push up or push down the upper work roll chock 10 and the lower work roll chock 14. Note that a plurality of cylinders 5 to 8 are provided. 17 and 18 are upper and lower backup rolls, 1
9 and 20 are upper and lower back up roll yoke. The bending cylinders 5 and 6 housed in the intermediate cylinder block 3 press the upper and lower work rolls 9 and 13 against the upper and lower back up rolls 17 and 18 with a certain pushing force to back up the work rolls 9 and 13. When used for the purpose of preventing slippage between the rolls 17 and 18, it functions as a balance cylinder and a contact cylinder, and also adjusts the working pressure of these cylinders 5 and 6 to prevent slippage between the upper and lower work rolls 9 and 13. Both act as a bending cylinder when used to generate a bending moment and control the shape of a plate.

In this work roll chock, during a roll cross operation in which the roll is tilted in a horizontal plane, slippage occurs at the contact surfaces between the rods 11, 12, 15, 16 of cylinders 5 to 8 and the upper and lower work roll jocks 10, 14. This slippage damages the contact surfaces, damages the gaskets, seals, etc. of the cylinders 5 to 8, and furthermore causes the drawbacks that the responsiveness of the roll cross tilting decreases.

Therefore, in order to reduce the sliding resistance on the contact surface, a rolling element mechanism is installed on the contact surface as shown in FIG.
1 is being considered. However, although damage to the contact surfaces can be prevented by providing the rolling element mechanism 21, damage to cylinder packings, seals, etc. cannot be sufficiently prevented.

The present invention has been made in view of the above-mentioned technical situation, and is aimed at reducing the horizontal direction generated at the contact surface between the work roll bending cylinder and the work roll chock when tilting the roll chock in a horizontal plane for roll cross rolling. The purpose is to increase the strength and rigidity of the cylinder against the load of the cylinder, and to extend the life of the cylinder packing.

The structure of the present invention for achieving the above object is such that the cylinder body is moved in and out of the cylinder block provided in the housing of the rolling mill at a portion facing the ear of the work roll chock with its bottom facing the ear. A piston rod that is movable and connects to a piston inserted into the cylinder body is fixed to the cylinder block side, while an inner cylinder bushing is integrally fitted on the outside of the cylinder body, and a It is characterized in that an outer cylindrical bushing is fixed to the cylinder block side with a gap therebetween, and a rolling element is assembled in the gap between these bushings.

Next, a work roll bending cylinder device according to the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 3 shows a cross section of one embodiment, and FIG. 4 shows a cross section taken along the line A--A. In addition, this example
The upper and lower bending cylinders incorporated in the intermediate cylinder block 3 are shown in which the present invention is applied. However, since the structure of the upper and lower cylinder devices is the same except for the direction, the following description will focus only on the upper cylinder. Only the device will be described.

A cylinder body (cylinder tube) 22 is accommodated in a portion of the intermediate cylinder block 3 attached to the housing that faces the ear 10a of the upper work roll chock 10, with the bottom (head) facing the ear 10a. be. Cylinder body 22
The tip 25a of the piston rod 25, which is connected to the inner piston 23 and passes through the cylinder cover 24 at the tip of the cylinder body 22, is fixed to the cylinder block 3 side by two keeper plates 26. The piston rod 25 and piston 23 have
An oil supply passage 28 is provided that penetrates from the tip of the piston rod 25 to the hydraulic chamber 27 on the bottom side of the cylinder body 22 bordering on the piston 23. An oil supply path 30 is provided that connects to the hydraulic chamber 29 on the tip side of the oil pressure chamber 22 . Each oil supply route 2
9 and 30 are connected via connecting pieces 33 to oil supply passages 31 and 32 provided in the cylinder block 3, which are connected to an external oil supply source. In the figure, 34 is a piston seal fitted into the piston rod 23 to seal between the piston 23 and the cylinder body 22, and 35 is a gland provided on the cylinder cover 24 to seal between the piston rod 25 and the cylinder cover 24. It's Patsukin. Further, 36 is an O-ring fitted into the connecting piece 33 in order to seal the connecting piece 33 against the piston rod 25 or the cylinder block 3.

On the other hand, an inner cylindrical bush 37 is integrally fitted to the outer periphery of the cylinder body 22 by means such as tight fitting, and an outer cylindrical bush 38 is provided on the cylinder block 3 side with a gap between the inner cylindrical bush 37 and the outer periphery. is fixed, and between the inner and outer bushes 37 and 38 there are many balls (steel balls) 39 as rolling elements in the cage 4.
It is held and provided by 0. Inner cylinder bush 3
Both the outer peripheral surface of 7 and the inner peripheral surface of the outer cylindrical bush 38 serve as rolling surfaces for the balls 39. As the retainer 40, for example, balls 3 are inserted into each of a plurality of holes.
An example is one in which 9 is rotatably fitted. 41 is a retaining ring provided near both upper and lower ends of the outer bushing 38 to prevent the balls 39 from coming off, and 42 is a retaining ring provided on the axial outside of each retaining ring 41 to seal between the inner and outer bushes 37 and 38. This is a seal attached to the inner peripheral surface of No. 38. 43 is an annular cover that presses and fixes the outer cylinder bush 38 to the cylinder block 3 from its upper end, and a dust seal 44 is provided on the inner peripheral side of the cover to prevent dust from entering along the inner cylinder bush 37. , is fixed to the cover 43 by a seal presser 45.

In the work roll bending cylinder device having the above configuration, the oil supply path 31 of the cylinder block 3
When pressure fluid (pressure oil) is sent to the piston rod 25 and piston 23, the pressure fluid enters the hydraulic chamber 27 through the oil supply path 28 provided in the piston rod 25 and the piston 23, and the cylinder body 22 and the inner cylinder bush 35 are caused by the fluid pressure. The head of the cylinder body 22 moves upward in the vertical direction and protrudes from the cylinder block 3, and the head of the cylinder body 22 comes into contact with the ear portion 10a of the work roll chock 10 directly or via the rolling element mechanism 21. Cylinder body 22
When the inner cylinder bush 37 moves, the ball 39 rolls between the inner cylinder bush 37 and the outer cylinder bush 38. When the fluid is switched to be sent from the oil supply passage 32 of the cylinder block 3, the fluid passes through the oil supply passage 30 and enters the hydraulic chamber 29, and the cylinder body 22 and the inner cylinder bush 37 are retracted by the fluid pressure.

During rolling, the cylinder main body 22 maintains contact with the ear portion 10a of the work roll chock 10 and follows the vertical movement of the roll chock 10, rolling the ball 39 between the inner cylinder bush 37 and the outer cylinder bush 38.
is rolling. When the roll chock 10 is moved in a horizontal plane for roll cross rolling, a relative slip occurs on the contact surface between the ear part 10a of the roll chock 10 and the cylinder body 22, and a frictional force is generated in the horizontal plane. From the main body 22, the inner cylinder bush 37, the ball 39, and the outer cylinder bush 38
is transmitted to the cylinder block 3 via the cylinder block 3, and finally received by the housing 1. In other words, the force applied to the piston rod 25 is reduced.
In addition, piston packing 34 and gland packing 3
By making the gap between the inner and outer bushes 37 and 38 of the ball 39 smaller than the gap between the mounting portions 5 and 5, the force acting on the piston rod 25 can be greatly reduced.

As described above in detail based on one embodiment, according to the work roll bending cylinder device according to the present invention, when the roll chock is tilted in a horizontal plane for roll cross rolling, the contact surface between the roll chock and the cylinder body is The horizontal force generated in the piston rod is transmitted from the cylinder body to the cylinder block via the inner bushing, ball, and outer bushing, and is ultimately received by the rolling mill housing, reducing the force acting on the piston rod. , the lifespan of gaskets, seals, etc. is extended. Furthermore, since the horizontal force is transmitted by the cylinder body, which has a larger moment of inertia of area than the piston rod, that is, has greater rigidity, it is advantageous in terms of strength against bending due to horizontal force.

[Brief explanation of the drawing]

Figure 1 is a side view of the separate roll chock;
The figure is a sectional view of a part of a roll chock having a rolling element mechanism on the contact surface, FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. 4 is a sectional view taken along the line A-A in FIG. be. In the drawing, 1 is a housing, 2, 3, 4 are cylinder blocks, 10 is an upper work roll choke, 1
0a is the ear part, 21 is the rolling element mechanism, 22 is the cylinder body, 23 is the piston, 25 is the piston rod, 27, 29 are the hydraulic chambers, 28, 30 are the oil supply passages,
34 is a piston packing, 35 is a gland packing, 37 is an inner cylinder bushing, 38 is an outer cylinder bushing,
39 is a ball.

Claims (1)

[Claims] 1. A cylinder block provided in the housing of the rolling mill is provided with a cylinder body movable in and out of the part facing the ear of the work roll chock with its bottom facing the ear, and the cylinder block is inserted into the cylinder body. While fixing the piston rod connected to the piston on the cylinder block side, the inner cylinder bushing is integrally fitted to the outside of the cylinder body, and the outer cylinder bushing is attached to the cylinder block side with a gap left between the inner cylinder bushing and the inner cylinder bushing. A work roll bending cylinder device characterized by fixed bushings and incorporating rolling elements into the gaps between these bushings.