JPH03142006A - Split roll of rolling mill - Google Patents

Abstract

PURPOSE:To reduce an amount of play in the thrust direction of a sleeve and to prevent a damage at the end parts of the sleeve by providing a pair of thrust pad devices supporting both ends of the sleeve on a roll axis. CONSTITUTION:When a thrust force toward the right acts on the sleeve 5, a thrust load is born by a roller bearing 1d of a right thrust pad device 1 to move the sleeve 5 to the right. When thrust force to the left acts to the contrary on the sleeve, the thrust load is born by the roller bearing 1d of a left thrust device 1. Accordingly, the thrust force acting on the sleeve 5 can be supported by a roll axis 51 through the thrust pad device 1. As a result, an amount of play of the sleeve 5 in the thrust direction and the damage at the end parts of the sleeve are reduced. Bearings 53a-53c by the thrust loas of the bearings 1d at an eccentric axis parts 51 of the end parts can be prevented from damage.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a split roll for a rolling mill whose roll crown can be changed.

<Prior Art> When rolling a steel plate, edge elongation and distortion may occur. When edge elongation occurs, the roll crown of the rolling roll is changed and adjusted.

As a rolling roll whose roll crown can be changed, the second
There is a split reinforcing roll for a four-high rolling mill as shown in the figure.

This is because the roll shaft 51 is formed with a central eccentric shaft portion 51a having different eccentric directions, a pair of left and right intermediate eccentric shaft portions 51b, and a pair of left and right end eccentric shaft portions 51c.
-51c are fitted with rolling bearings 53a-53c, and each outer ring 54a-54c is a rotatable divided roll.

Both ends of the roll shaft 51 are supported via thrust bearings 57 in a bearing box 56 that can be raised and lowered within a housing (not shown), and a worm wheel 58 and a worm 59 are mounted on one end of the shaft.
is installed.

An integral, cylindrical sleeve 55 is loosely fitted into each of the outer rings 54a to 54c, and the sleeve 55 is prevented from moving in the axial direction by a rolling bearing outer ring 54c of the end eccentric shaft portion 51c.

FIG. 3 shows the eccentricity of each of the outer rings 54a to 54c at each angle of the roll shaft 51 with respect to the roll shaft axis 0, where Oa is the axis of the outer ring 54a in the center, ob
is the axis of the outer ring 54b at the intermediate portion, and Oc is the outer ring 54c at the end.
The axis of each axis is shown.

When rolling a material to be rolled W using a rolling mill having such a reinforcing roll, the work roll 61 is supported by this reinforcing roll by rolling down the bearing box 56, and the roll is rotated according to the plate shape of the material to be rolled. The shaft 51 is appropriately rotated by a worm 59 and a worm wheel 58 to form an optimal roll crown.

During the rolling of B, the meandering of the rolled material W or the work roll 61
A thrust force acts on the work roll 61 and the sleeve 55 due to a cross caused by an error in parallelism between the work roll 61 and the roll shaft 51.

The thrust force of this sleeve 55 is the outer ring 54c.

It is transmitted to the rolling bearing 53c and the roll shaft 51, and is supported by the thrust bearing 57 and the bearing box 56.

<Problems to be Solved by the Invention> However, in the conventional split roll as described above, the thrust force transmitted to the sleeve 55 acts on the outer ring 54c through either end thereof. Therefore, the end of the sleeve 55 and the side surface of the outer ring 54c were easily damaged.

<! l! Means for Solving Problem I> In order to solve the above problem, a split roll of a rolling mill according to the present invention has a plurality of eccentric shaft parts each eccentric with respect to the axial center, and both ends thereof have a bearing box. A split roll comprising a roll shaft supported by a roll shaft, and a cylindrical sleeve fitted to each of the eccentric shaft portions of the roll shaft via a bearing, wherein both ends of the sleeve are attached to the roll shaft. It is characterized by providing a pair of thrust receiving devices that support the surface.

<Function> When the sleeve receives a thrust force during rolling, the end face in the direction in which the thrust force acts is supported by a thrust receiving device supported by the roll shaft, and the amount of backlash in the thrust direction is reduced.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, but the same members as in FIG. 2 are given the same reference numerals and redundant explanation will be omitted.

As shown in FIG. 1, both ends of the roll shaft 51 are supported by a bearing box 6 via sliding bearings 7. As shown in FIG. Roll axis 51
A straight cylindrical sleeve 5 is loosely fitted into each of the eccentric shaft portions 51a to 51c via respective rolling bearings 53a to 53c and outer rings 54a to 54c.

Roll shafts 51 located on both sides of the sleeve 5
At the top, thrust receiving devices 1, 1 for supporting the end faces of the sleeve 5, respectively, are attached.

This thrust receiver [1] is composed of a sleeve pressing hardware 1a, a pressing spring lb, a retainer IC, and a rolling bearing 1d, and the rolling bearing 1d is a composite type bearing in which a radial bearing and a thrust bearing are integrated. There is.

That is, a spacer 8 and a sleeve 9 are fitted to both ends of the roll shaft 51, and these spacers 8 and sleeve 9 are supported by a rolling bearing 53c by an end plate 10°10'.
The roll shaft 51 is fixed to the roll shaft 51 by pressing the end face thereof. Further, a bearing box 6 is provided in the sleeve 9 portion of the roll shaft 51 via the above-mentioned sliding bearing 7. On the other hand, the spacer 8 portion of the roll shaft 51 is provided with a notch 4g' on its outer circumferential surface, and the thrust holder 11 is fitted into this notch Fm8'. Then, the rolling element receiver 1f of the composite type bearing of the thrust receiver 1 comes into contact with the thrust receiving metal fitting 11, and the end face of the rolling bearing outer ring 1d comes into contact with this rolling element receiver 1f via the balls 1e, and the spacer 8 is fitted with an inner ring 1g, and a rolling bearing outer ring 1d is fitted onto the outer periphery of this inner ring 1g via rollers 1h.

Further, a retainer 1c is fitted to the outer periphery of the outer ring 1d,
The outer periphery of the retainer 1C and the sleeve pressing hardware 1a are spline-fitted so that they rotate at the same time. Further, one end surface of the sleeve pressing hardware 1a abuts on the sleeve 5, and a pressing spring 1b is provided between the other end surface of the sleeve pressing hardware 1a and the flange of the retainer IC.

Further, since this reinforcing roll is a roll in which the roll shaft 51 is fixed and the sleeve 5 is rotatable during normal operation, a rolling bearing 1d is provided.

Because of this structure, when a thrust force is applied to the sleeve 5 to the right in Fig. 1, the sleeve 5 tries to move to the right, causing the sleeve 5 to receive the thrust to the right! ! ! A thrust load is applied to the rolling bearing 1d. Furthermore, when a leftward thrust force acts on the sleeve 5, the thrust load is applied by the rolling bearing 1d of the left thrust receiver [1].

In addition, in this embodiment, the pressing spring 1 is attached to the thrust receiving device 1.
b is incorporated, but this does not have to be specifically incorporated.

Also, what about this example? In addition to the 4-high rolling mill, the 1st roll is
It can also be used as a reinforcing roll for 6-high rolling mills, multi-high cluster rolling mills, etc.

In addition, although the above embodiment showed an example in which the present invention was applied to a reinforcing roll, the present invention can be applied not only as a reinforcing or intermediate roll but also as a work roll.

<Effects of the Invention> As described in detail above, in the present invention, by providing the thrust receiving device on the roll shaft so as to support both end surfaces of the cylindrical sleeve, the thrust force acting on the cylindrical sleeve can be absorbed by the thrust receiving device. The sleeve can be supported by a roll shaft via a device, which reduces the amount of backlash in the thrust direction of the sleeve and reduces damage to the sleeve end. Damage can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional example, and FIG. 3 is an explanatory view showing the eccentric state of the roll shaft in FIGS. 1 and 2. In the figure, 1 is a thrust receiving device, la is a sleeve pressing hardware, 1b is a pressing spring, IC is a retainer, 1d is a rolling bearing, 5 is a sleeve, 6 is a bearing box, 51 is a roll shaft, and 51a is a central eccentric shaft. part, 51b is an intermediate eccentric shaft part, 5
1c is an end eccentric shaft portion, 53 a, 53 b, 53
c is a rolling bearing.

Claims (1)

[Claims] A roll shaft having a plurality of eccentric shaft parts each eccentric with respect to the shaft center and supported at both ends by a bearing box, and one roll shaft fitted to each of the eccentric shaft parts of the roll shaft via a bearing. 1. A split roll for a rolling mill, comprising a cylindrical sleeve, the roll shaft being provided with a pair of thrust receivers for supporting both end surfaces of the sleeve.