JP2895307B2 - Thrust receiving device of 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 device for supporting a thrust force acting on upper and lower rolls of a cross roll rolling mill such as a work roll cross or a pair cross roll for crossing an upper work roll and a lower work roll with each other. .

[0002]

2. Description of the Related Art In a cross roll rolling mill, when a work roll is crossed, a roll chock rotates in an arc shape on a horizontal plane about a center point in the axial direction of the work roll. Therefore, the rolled material input end and the rolled material output end of the roll chock move in directions opposite to each other in the roll axis direction. Further, when the work rolls are crossed, a large thrust force acts in the roll axis direction during rolling, and this thrust force needs to be supported by a rolling mill housing via a roll chock and a thrust receiving device.

FIGS. 3 and 4 are a cut-away plan view and a side view of a work roll cross rolling mill showing an example of the above-mentioned conventional apparatus, in which a roll chock 52 for supporting a work side of upper and lower work rolls 51 is shown. Outer side entrance A and exit B
Is provided with a projection 63, and a substantially L-shaped lever 64 is pivotally attached to each. Both levers 64 are linked 6
Rollers 62 whose outer surfaces are formed into spherical surfaces around the axes c and f are rotatably connected to the two shafts 65 which are rotatably connected by the respective levers 64 and protrude from the respective levers 64. I have.

Reference numeral 61 denotes a thrust receiving block, which is disposed on each of the inlet side A and the outlet side B of the housing 56, and a roller 62 is loosely fitted in its guide groove 61a. 5
3 is a backup roll. 57 is a crosshead for rotating the roll chock 52, 58 is a crosshead 5
7 is a moving device for moving the device 7 to the entrance side A and the exit side B.

In rolling, upper and lower work rolls 51 are
By moving the cross head 57, the work roll center C
When they cross each other at a required cross angle θ from o, the upper and lower roll chocks 52 rotate to the entrance side A and the exit side B about the center point O in the roll axis direction. Therefore, the protrusions 63 on the entrance side A and the exit side B move in the directions opposite to each other in the roll axis direction.

In FIG. 5, when the roll axis C ₅₁ of the lower work roll 51 is set to an arbitrary cross angle θ from the work roll center C _O , the center point O in the roll axis direction and the connection between the projection 63 and the lever 64 are established. Triangle O formed by points a and b
ab moves on the radii Oa and Ob around the center point O in the roll axis direction as indicated by the chain line.

The triangles acd and bef formed by the connecting points d and e of the lever 64 and the link 66 and the center points c and f of the roller 62 are each formed by abed.
It moves to the position shown by the chain line by the node link mechanism. At this time, the roller 62 linearly moves in the horizontal direction within the guide groove 61a of the guide 61.

Accordingly, the thrust force Fs acting on the work roll 51 having the cross angle θ is
2, through the projection 63, the lever 64, the shaft 65, and the roller 62, it is transmitted perpendicularly and uniformly to the thrust receiving surfaces 61b of both the thrust receiving blocks 61.

[0009]

In the conventional apparatus, since the outer surface of the roller 62 is spherical, the work roll 5 is not provided.
When the thrust force Fs acts on the roller 1 and the roller 62 is pressed against the thrust receiving surface 61b of the guide groove 61a of the thrust receiving block 61, the outer peripheral surface of the roller 62 and the thrust receiving surface 61b of the thrust receiving block 61 are moved. The contact portion becomes a point contact. In the work roll cloth rolling mills shown in FIGS. 3 and 4, the thrust force Fs is particularly large, so that the surface pressure of the contact portion becomes very large. To avoid this, there is a problem that the roller 62 becomes large. there were.

[0010]

In order to solve the above-mentioned problems, the structure of the thrust receiving device of the cross roll rolling mill according to the present invention comprises the steps of: rolling upper and lower work rolls and their roll chocks; In a cross roll rolling mill that crosses in a plane parallel to the plate surface and crosses the upper and lower work rolls with each other, a shaft mounted on the roll chock with a roll cross direction as an axis, a cylindrical outer peripheral surface and a spherical A roller having an inner peripheral surface and being axially mounted on the shaft via a spherical bush having a spherical outer peripheral surface sliding on the inner peripheral surface, and supporting the roller with a thrust receiving surface in a thrust force acting direction; And a thrust receiving means.

[0011]

When the upper and lower work rolls are crossed, the roll chocks rotate at the cross angle about the center point in the roll axis direction, so that the shaft and the axial center of the spherical bush attached to the shaft are connected to the thrust. The angle between the thrust receiving surface of the receiving means and the outer peripheral surface of the roller in horizontal line contact with the thrust receiving surface changes.

At this time, the inner peripheral surface of the roller and the outer peripheral surface of the spherical bush, which are spherical, slide in the axial direction in an arc shape centered on the axis, and the outer peripheral surface of the roller and the thrust receiving means. Maintains line contact with the thrust receiving surface and surface contact between the roller and the spherical bush.

[0013]

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.
FIG. 1 is a plan view showing a first embodiment of a work roll cross rolling mill in which only upper and lower work rolls are crossed and upper and lower backup rolls are parallel to each other.

In FIG. 1, reference numeral 5 denotes a shaft, and an axial groove 5 a into which the ball-shaped stroke bearing 3 is inserted is engraved over the entire circumference and is mounted on a lever 64.

1 is a spherical bush whose outer peripheral surface is spherical,
An axial groove (not shown), into which the ball-shaped stroke bearing 3 is inserted, is formed on the inner peripheral surface over the entire circumference.
It is mounted on a shaft 5 via a stroke bearing 3.

Reference numeral 2 denotes a roller whose outer peripheral surface is cylindrical and whose inner peripheral surface is spherical. The roller is fitted on the spherical bush 1 so that its inner peripheral surface slides in all directions with the outer peripheral surface of the spherical bush 1. ing.

When the upper and lower work rolls 51 are crossed at a required cross angle θ from the work roll center Co by the movement of the cross head 57 by the moving device 58 during the rolling of the rolled material 50, the upper and lower roll chocks 52.
Rotate around a center point 0 in the roll axis direction at a cross angle θ.

Therefore, the shaft 5 of the upper roll chock 52 shown in FIG.
The second shaft 5 moves to the outlet side.

At this time, when the thrust force Fs is acting, the stroke bearing 3
Is smaller than the frictional resistance between the roller 2 and the thrust receiving surface 61b, the roller 2, the spherical bush 1 and the stroke bearing 3 do not move.
Only the shaft 5 is smoothly moved in the axial direction by the stroke bearing 3.

The axis angle of the shaft 5 changes as in the prior art, but this change in the axis angle is absorbed by the axial sliding of the spherical bush 1 and the roller 2.

Work roll 5 in rolling of rolled material 50
Roll chock 5 during rolling for bending 1
Roller 2 slides in the circumferential direction with the spherical bush 1, and the thrust receiving surface 61b is moved by the thrust force Fs.
It rotates while being pressed by.

FIG. 2 is a plan view showing a second embodiment of the present invention. In this embodiment, the shaft 5 is fixed to the roll chock 52 via the protrusion 13, and the upper and lower work rolls 51 are roll-crossed by the cross angle θ.
The shafts 5 on the entry side A and the exit side B of the upper roll chock 52 move in the guide groove 11a in the direction opposite to each other in the roll axis direction and in the entry side A. The receiving block 11 is guided by the guide frame 12 and is moved in the roll axis direction by an equal distance in the opposite direction, and the thrust force Fs is supported by the hydraulic cylinder 14. The other components are the same as those in the first embodiment. . When the axis of the shaft 5 changes at the same angle as the cross angle θ, the roller 2, the spherical bush 1 and the stroke bearing 3 operate in the same manner as in the first embodiment.

In FIG. 2, the hydraulic pressure sent from the hydraulic device 18 to the load side and the head side of both hydraulic cylinders 14 via the switching valve 15 and the hydraulic pipes 16 and 17 is sealed by the switching valve 15. The thrust force Fs acting on the upper work roll 52 is supported by the load side hydraulic pressure.

The rod side and the head side of both hydraulic cylinders 14 are connected by hydraulic pipes 16 and 17, respectively, and when both thrust receiving blocks 11 are evenly moved in opposite directions by a roll cross as shown in the figure. The oil on the rod side of the hydraulic cylinder 14 on the input side A moves to the hydraulic cylinder 14 on the output side B, and the oil on the head side of the hydraulic cylinder on the output side B moves to the hydraulic cylinder 14 on the input side A, The balance between the two hydraulic pressures is maintained, and the thrust force Fs is equally supported on the inlet side A and the outlet side B.

In each of the above embodiments, the work roll thrust receiving device is described. However, in a work roll cross rolling mill, since a thrust force is also generated in the backup roll, the present invention can also be applied to the thrust receiving device. In a rolling mill in which the cross angle is set before rolling and the cross angle is not changed during rolling, the stroke bearing may not be used.

The present invention can also be applied to a pair cross roll mill in which upper and lower backup rolls different from those in the above embodiments are crossed together with upper and lower work rolls.

[0027]

According to the present invention, the spherical inner peripheral surface of the roller and the spherical outer peripheral surface of the spherical bush are slid in an arc-shaped axial direction centered on the axial center, whereby the axial center of the roller and the spherical bush are rotated. Since the angle with the center can be changed freely, no matter how the cross angle of the upper and lower rolls changes, the roller and the thrust receiving surface of the thrust receiving means are in line contact, and the roller and the spherical bush are in surface contact. Can be maintained.

Therefore, the pressing force (surface pressure) per unit area due to the thrust force is reduced, and the size of the roller and the thrust receiving member can be reduced, so that the cost of the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view in which main parts of a work roll cloth rolling mill according to a first embodiment of the present invention are cut away.

FIG. 2 is a plan view in which main parts of a work roll cloth rolling mill according to a second embodiment of the present invention are broken.

FIG. 3 is a plan view in which main parts of an example of a conventional work roll cloth rolling mill are cut away.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a conceptual plan view illustrating the operation of a conventional four-link thrust receiving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spherical bush 2 Roller 5 axis 11 ・ 61 Thrust receiving block 11b ・ 61b Thrust receiving surface 50 Rolled material 51 Work roll 52 Roll chock Fs Thrust force

Claims (1)

(57) [Claims] 1. A cross-roll rolling mill that crosses upper and lower work rolls and their roll chocks in a plane parallel to a rolled plate surface with the axis of these work rolls and crosses the upper and lower work rolls with each other. An axis mounted on the roll chock with the roll cross direction as the axis,
A roller having a cylindrical outer peripheral surface and a spherical inner peripheral surface, and a roller axially mounted on the shaft via a spherical bush having a spherical outer peripheral surface sliding on the inner peripheral surface; And a thrust receiving means for supporting the thrust receiving surface in the direction.