JPH05277526A - Thrust bearing device for cross roll mill - Google Patents

Abstract

PURPOSE:To miniaturize a roller and a thrust bearing member by reducing pressing pressure per unit area by thrust force. CONSTITUTION:A shaft 5 provided on a roll chock 52 with its shaft center in the direction of a roll cross, a roller 2 pivoted on the shaft 5 through a spherical surface bush 1 which is furnished well with a cylindrical outer peripheral surface, a spherical inner peripheral surface and a spherical outer peripheral surface sliding on this inner peripheral surface, and thrust bearing blocks 61 supporting this roller 2 with thrust bearing surfaces 61b in the operating direction of thrust force are set up and however the cross angles of upper and lower work rolls 51 change, the roller 2 and the thrust bearing surfaces 61b of the thrust bearing blocks 61 are maintained in a line contact and the roller 2 and the spherical surface bush 1 are maintained in a plane contact.

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 machine 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 machine, 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 entry side end and the rolled material exit side end of the roll chock move in mutually opposite directions in the roll axial direction. Further, when the work rolls are crossed, a large thrust force acts in the roll axial direction during rolling, and this thrust force needs to be supported by the rolling mill housing via the roll chock and the thrust receiving device.

3 and 4 are a cutaway plan view and a side view of a work roll cross rolling machine showing an example of the conventional apparatus as described above, showing a roll chock 52 for supporting working sides of upper and lower work rolls 51. Outer side entrance side A and exit side B
A protrusion 63 is provided on each of the levers, and levers 64 each having a substantially L shape are pivotally attached to the protrusions 63. Both levers 64 are links 6
Rollers 62 each having an outer surface formed into a spherical surface centering on the shaft centers c and f are rotatably attached to both shafts 65 that are rotatably connected by 6 and project from each lever 64. There is.

Reference numeral 61 is 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 the guide groove 61a thereof. 5
3 is a backup roll. 57 is a crosshead for rotating the roll chock 52, and 58 is a crosshead 5.
7 is a moving device for moving the entrance side A and the exit side B.

During rolling, the upper and lower work rolls 51 are
By moving the cross head 57, the work roll center C
When they are crossed with each other at a required cross angle θ from o, the upper and lower roll chocks 52 rotate about the center point O in the roll axial direction to the entrance side A and the exit side B. Therefore, the protrusions 63 on the inlet side A and the outlet side B move in opposite directions 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 axial direction and the connection between the protrusion 63 and the lever 64 are set. Triangle O formed by points a and b
The ab moves on the radii Oa and Ob about the center point O in the roll axial direction, as shown by the chain line.

Further, 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 formed by abbed 4 respectively.
It moves to the position shown by the chain line by the node link mechanism. At this time, the roller 62 moves linearly in the guide groove 61a of the guide 61 in the horizontal direction.

Therefore, the thrust force Fs acting on the work roll 51 having the cross angle θ is equal to the roll chock 5
2. Through the protrusion 63, the lever 64, the shaft 65 and the roller 62, the force is uniformly transmitted to the thrust receiving surfaces 61b of both thrust receiving blocks 61 at a right angle.

[0009]

In the conventional apparatus, since the outer surface of the roller 62 is spherical, the work roll 5
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 separated from each other. The contact part becomes a point contact. In the work roll cross rolling mill of FIGS. 3 and 4, the thrust force Fs becomes particularly large, so the surface pressure of the contact portion becomes very large, and if it is attempted to avoid this, 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 machine according to the present invention is such that the upper and lower work rolls and roll chock thereof are rolled around the axis of these work rolls. In a cross roll rolling machine that crosses in a plane parallel to the plate surface and crosses the upper and lower work rolls with each other, a shaft mounted with the roll cross direction as an axis in the roll chock, a cylindrical outer peripheral surface and a spherical shape. A roller axially attached to the shaft through a spherical bush having an inner peripheral surface and a spherical outer peripheral surface sliding on the inner peripheral surface, and the roller are supported by a thrust receiving surface in the thrust force acting direction. A thrust receiving means is provided.

[0011]

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

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

[0013]

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 designated by the same reference numerals, and duplicated description will be omitted. Figure 1
FIG. 3 is a plan view showing a first embodiment of a work roll cross rolling machine 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 designates a shaft, and an axial groove 5a into which the ball-shaped stroke bearing 3 is inserted is engraved over the entire circumference and mounted on a lever 64.

Reference numeral 1 denotes a spherical bush having a spherical outer peripheral surface,
On its inner peripheral surface, a ball-shaped stroke bearing 3 is inserted, and an axial groove (not shown) is engraved over the entire circumference,
It is attached to the shaft 5 via the stroke bearing 3.

Reference numeral 2 denotes a roller having an outer peripheral surface of a cylindrical shape and an inner peripheral surface of a spherical shape. The inner peripheral surface of the roller 2 is fitted to the spherical bush 1 so as to slide in any direction with the outer peripheral surface of the spherical bush 1. ing.

When rolling the rolled material 50, the upper and lower work rolls 51 are moved at a desired cross angle θ from the work roll center Co by the movement of the cross head 57 by the moving device 58, and the upper and lower roll chocks 52 are formed.
Rotate about 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. 1 moves to the entrance side A, and the lower roll chock 5
The shaft 5 of 2 moves to the exit side.

At this time, when the thrust force Fs is acting, the stroke bearing 3 of the spherical bush 1 and the shaft 5
Since the frictional resistance in the axial direction via 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.

Further, although the shaft center angle of the shaft 5 changes as in the conventional case, the change of the shaft center angle is absorbed by the sliding of the spherical bush 1 and the roller 2 in the axial direction.

Work roll 5 in rolling the rolled material 50
Roll chock 5 during rolling for 1 bending
2, the roller 2 slides in the circumferential direction with the spherical bush 1, and the thrust force Fs causes the thrust receiving surface 61b to move.
Rotate 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 protrusions 13, and the roll cross by the cross angle θ of the upper and lower work rolls 51 causes
Since the shafts 5 on the inlet side A and the outlet side B of the upper roll chock 52 move in the guide grooves 11a in directions opposite to each other in the roll axial direction and in the inlet side A, both thrusts follow the movement of the shaft 5 in the roll axial direction. The receiving block 11 is guided by the guide frame 12 and is moved in the roll axial direction by equal distances in mutually opposite directions, and the thrust force Fs is supported by the hydraulic cylinder 14, and the other points are the same as in the first embodiment. .. Then, 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 switching valve 15 seals 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. The load side hydraulic pressure supports the thrust force Fs acting on the upper work roll 52.

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 move uniformly in the opposite directions as shown by a roll cross. , The oil on the rod side of the hydraulic cylinder 14 on the inlet side A moves to the hydraulic cylinder 14 on the outlet side B, and the oil on the head side of the hydraulic cylinder on the outlet side B moves to the hydraulic cylinder 14 on the inlet side A, Both oil pressures are maintained in balance, and the thrust force Fs is evenly 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, but in the work roll cross rolling machine, the thrust force is also generated in the backup roll, so that it can be applied as the thrust receiving device. Further, 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 rolling machine for crossing the upper and lower backup rolls together with the upper and lower work rolls, which is different from each of the above embodiments.

[0027]

According to the present invention, the axial center of the roller and the axial surface of the spherical bush are caused by the sliding of the spherical inner peripheral surface of the roller and the spherical outer peripheral surface of the spherical bush in an arcuate axial direction about the axial center. Since the angle with the center can be freely changed, 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 spherical bush are in surface contact. Can be maintained at.

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

[Brief description of drawings]

FIG. 1 is a plan view in which a main part of a work roll cross rolling mill according to a first embodiment of the present invention is broken away.

FIG. 2 is a plan view in which a main part of a work roll cross rolling mill according to a second embodiment of the present invention is cut away.

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

FIG. 4 is a side view of FIG.

FIG. 5 is a schematic plan view illustrating the operation of a conventional 4-link type thrust receiving device.

[Explanation of symbols]

 1 Spherical Bushing 2 Roller 5 Shaft 11/61 Thrust Bearing Block 11b / 61b Thrust Bearing Surface 50 Rolled Material 51 Work Roll 52 Roll Chock Fs Thrust Force

Claims (1)

[Claims] 1. A cross roll rolling machine in which upper and lower work rolls and roll chock thereof are crossed in a plane parallel to the rolling plate surface so that the upper and lower work rolls cross each other. A shaft mounted on the roll chock with the roll cross direction as the axis center,
A roller axially attached to the shaft through a spherical bush having a cylindrical outer peripheral surface and a spherical inner peripheral surface, and a spherical outer peripheral surface sliding on the inner peripheral surface, and a thrust force acting on the roller. A thrust receiving device for a cross roll rolling machine, comprising: a thrust receiving means supported by a thrust receiving surface in the direction of the arrow.