JPH0679313A - Sleeve type back-up roll and device for grinding sleeve thereof - Google Patents

Abstract

PURPOSE:To drastically reduce preparatory time required for sleeve grinding. CONSTITUTION:Surfaces 2 to be supported of which the diameters are smaller than the allowable min. outside diameter of sleeve are provided on the outer peripheral surfaces in both end parts of a sleeve 52 and also, by providing means for fixing rotation between the sleeve 52 and the roll shaft 51, the outer peripheral surface of the sleeve is ground in the state that the sleeve 52 is mounted on the sleeve type back-up roll 10 with a grinding wheel on a grinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve type reinforcing roll which can be used for a reinforcing roll of a rolling mill and has a changeable roll crown, and a sleeve grinding device therefor.

[0002]

2. Description of the Related Art FIG. 5 is a cutaway front view showing an example in which a sleeve type reinforcing roll whose roll crown can be changed is used in a four-high rolling mill.

As shown in FIG. 5, the roll shaft 51 has eccentric parts 51a, which are eccentric from the shaft center and have different eccentric directions and diameters.
51b and 51c are provided. Then, the rolling bearing 53 is provided on each of the eccentric portions 51a, 51b, 51c.
And the outer ring of these rolling bearings 53 constitutes a split roller rotatable with respect to each eccentric portion 51a, 51b, 51c.

A cylindrical sleeve 52 is integrally fitted to the outer ring of the rolling bearing 53, and a side plate 55 and a thrust bearing 54, which are fixed by bolts 56 at both ends, are arranged to axially position the roll shaft 51. Has been done. The sleeve-type reinforcing roll 60 is configured by the above members.

Both ends of the roll shaft 51 are rotatably supported by a roll chock 58 that moves up and down in the housing of a rolling mill (not shown), and a motor (not shown) and a worm speed reducer 59 connected thereto are installed.

The sleeve type reinforcing roll 60 rolls down the work roll 61 circumferentially contacting the roll, and the upper and lower work rolls 61 are rotated to roll the rolled material 50 between the two rolls, whereby the sleeve 52, the side plate 55 and the bolt 5 are rolled.
6, the outer rings of the rolling bearing 53 and the thrust bearing 54 rotate together with the work roll 61.

During rolling, a roll shaft 51 is rotated at a required angle by a motor and a worm speed reducer 59 (not shown) to change the angles of the eccentric portions 51a, 51b and 51c and the sleeve 52 and the crown of the work roll 61. The plate shape of the rolled material 50 is controlled by adjusting the pattern.

[0008]

By the way, during the rolling work under the work roll pressure by the conventional sleeve type reinforcing roll as described above, the outer peripheral surface of the sleeve 52 is
Rolling of the rolled material 50 causes defects such as one-sided wear, dents, and scratches.

However, since there is a clearance of about 1 to 2 mm between the inner peripheral surface of the sleeve 52 and the outer peripheral surface of the outer ring of the bearing 53, the roll chock 58 and the worm reducer 59 are removed from the roll shaft 51. It is difficult to remove the defect by grinding the outer peripheral surface of the sleeve 52 with a grinder while the sleeve type reinforcing roll 60 is integrated.

Therefore, in order to grind the outer peripheral surface of the conventional sleeve, the side plate 55 fixed by a large number of bolts 56 is removed and the sleeve 52 is pulled out.
A cored bar (not shown) was attached to 2 and the outer peripheral surface was ground by a grinder.

Therefore, the bolt 56 and the side plate 5
5, it took a long time to attach and detach the sleeve 52, the core metal (not shown), and the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new sleeve type reinforcing roll and a sleeve grinding apparatus for the same which are capable of solving the above-mentioned problems and significantly reducing the preparation time required for sleeve grinding.

[0013]

In order to achieve the above object, a sleeve type reinforcing roll according to the present invention has a roll shaft which has an eccentric reinforcing roll shaft attachment portion and rotates at a required angle.
A sleeve type reinforcing roll of a rolling mill in which a reinforcing roll divided in the axial direction of the roll is rotatably attached and a cylindrical sleeve is loosely fitted around the outer periphery of the reinforcing roll. It is characterized in that a supported surface for grinding having a diameter smaller than the minimum outer diameter and sleeve rotation stopping means for fixing the rotation of the sleeve and the roll shaft are provided.

Further, the sleeve grinding apparatus rotates the grinding wheel in a lateral direction opposite to the lateral supporting portion of the sleeve supporting means for supporting one of the lower side and the lateral direction of the supported surface for grinding. And a grindstone rotary feed means for moving the grindstone in the axial direction and the radial direction of the sleeve,
Reinforcing roll rotating means for rotating the roll shaft is provided.

[0015]

When the outer peripheral surface of the sleeve type reinforcing roll is ground, the sleeve is first fixed to the roll shaft by the sleeve rotation preventing means, and then the sleeve supporting means fixes the surface to be ground of the sleeve. It supports one of substantially downward and lateral directions. Next, while rotating the sleeve-type reinforcing roll by the reinforcing roll rotating means, while pressing the outer peripheral surface of the sleeve while rotating the grindstone by the grindstone rotating feed means in the direction opposite to the lateral support portion of the sleeve, and over the entire axial length thereof. It is reciprocally moved to grind its outer peripheral surface to correct one-sided wear and remove defects such as dents and scratches.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view showing one side of a sleeve type reinforcing roll with a grinding jig attached thereto according to an embodiment of the present invention, FIG. 2 is an enlarged side view of FIG. 1, and FIG. 3 is a sleeve type. FIG. 4 is a plan view showing a state where the sleeve of the reinforcing roll is ground by a grinder, and FIG. 4 is a sectional view taken along line IV-IV of FIG. In the drawings, the same members as those of the conventional device are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIGS. 1 and 2, the sleeve 52
A supported surface 2 having a diameter smaller than the allowable minimum outer diameter is formed on the outer circumference of both ends of the. A cylindrical portion 5 is provided on the outer surface of the side plate 55, and a screw hole into which the pin 11 is screwed is formed. Further, grooves 1 having the same number and the same pitch as the screw holes are formed in a portion of the roll shaft 51 facing the cylindrical portion 5.

Therefore, the worm speed reducer and the roll chock (not shown) are removed from the roll shaft 51, and each pin 1
1 is screwed into the cylindrical portions 5 of both side plates, and the tip end thereof is inserted into the groove 1 to fix the sleeve 52 and the side plate 55 so as not to rotate with respect to the roll shaft 51, and then the keray 12 is rolled. When the sleeve 52 is fitted to one end of the shaft 51, the sleeve 52 is ready for grinding.

On the other hand, the grinder 40 is a known grinder as shown in FIGS. 3 and 4, and the grindstone 3 is placed on the bed 37.
1 is mounted on the grindstone rotary feed device 32, and the disk 33
And a shaft rotating device 35 as a reinforcing roll rotating means to which the bar 34 is attached, and a pedestal 36 for supporting the lower and lateral sides of the roll shaft 51.

A lower support block 21 and a lateral support block 26, which are supported by a pair of support bases 20, are provided on the bed as the sleeve support means of the present invention.

The lower support block 21 is slidably fitted into the guide hole 23 of the support base 20 by a wedge 24 and a bolt 25, and has a tip made of a soft metal that slides on the supported surface 2. The metal 22 is attached.

The lateral support block 26 is fitted in the guide hole 28 so as to slide by a bolt 29, and a metal 27 of the same quality as that described above is attached to the tip thereof.

Therefore, when performing grinding, first,
The sleeve-type reinforcing roll 10 for which the above-described sleeve grinding preparation is completed is mounted on the grinder 40, the roll shaft 51 is supported by the pedestal 36, and the roll shaft 51 is centered. It is supported by the support block 21 and the lateral support block 26, and the bolts 25 and 29 are rotated to move the lower support block 21 and the lateral support block 26 to center the sleeve 52.

Next, the sleeve type reinforcing roll 10 is rotated by the shaft rotating device 35 via the disk 33, the bar 34 and the kelet 12, and the grindstone 31 is rotated by the grindstone rotary feed device 32, while the outer periphery of the sleeve 52 is being rotated. The outer peripheral surface of the sleeve 52 is ground by pressing it against the surface and reciprocating over the entire length in the axial direction to correct one-sided wear and remove defects such as pressing scratches and abrasions.

[0025]

The present invention has the following effects. (1) In claim 1, by providing a supported surface for grinding the outer peripheral surface on the outer circumference of both ends of the sleeve of the sleeve type reinforcing roll, and by providing a sleeve rotation preventing means for fixing the rotation of the sleeve and the roll shaft, Since the sleeve can be rotated by the rotation of the roll shaft while supporting the supported surface for grinding the outer peripheral surface, the outer peripheral surface can be easily and quickly ground while the sleeve is mounted on the sleeve type reinforcing roll. (2) In the present invention, the sleeve grinding device is provided with the sleeve supporting means, the grindstone rotary feeding means, and the reinforcing roll rotating means, so that the sleeve-type supported support for grinding the sleeve mounted on the sleeve type reinforcing roll is provided. By rotating and moving the grindstone while supporting and rotating the surface, the outer peripheral surface of the sleeve can be easily ground to correct one-side wear and remove surface defects.

[Brief description of drawings]

FIG. 1 is a one-side cutaway plan view showing a state in which a grinding jig is mounted on a sleeve type reinforcing roll, which is an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view showing a state where the sleeve of the sleeve type reinforcing roll is being ground by a grinder.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a cutaway front view showing a conventional sleeve type reinforcing roll.

[Explanation of symbols]

 1 Groove 2 Supported Surface 5 Cylindrical Part 10 Sleeve Reinforcing Roll 11 Pin 12 Kelet 21 Lower Support Block 26 Horizontal Support Block 31 Grindstone 32 Grindstone Rotating Feed Device 35 Shaft Rotating Device 40 Grinding Machine 51 Roll Shaft 52 Sleeve 55 Side Plate

Claims (2)

[Claims] 1. A reinforcing roll, which is divided in the roll axial direction, is rotatably mounted on a roll shaft having an eccentric reinforcing roll shaft mounting portion and rotating at a required angle, and a cylindrical shape is formed on the outer circumference of the reinforcing roll. In a sleeve type reinforcing roll of a rolling mill in which the sleeve is loosely fitted, rotation of the sleeve and the roll shaft, which is provided on the outer circumference of both ends of the sleeve and has a diameter smaller than the minimum allowable outer diameter of the sleeve, is prevented. A sleeve-type reinforcing roll, characterized in that it is provided with a sleeve rotation stopping means for fixing. 2. A sleeve supporting means for supporting one of a lower side and a lateral direction of the supported surface for grinding, a grindstone rotating in a lateral direction opposite to a lateral supporting portion of the sleeve supporting means, and the sleeve. A sleeve grinding device for a sleeve-type reinforcing roll, comprising: a grindstone rotary feed means for moving the grindstone in the axial direction and the radial direction of the above, and a reinforcing roll rotating means for rotating the roll shaft.