JPS6055260B2 - Roll polishing method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The work rolls and backing rolls of a rolling mill need to be polished frequently.

When polishing a roll of a conventional rolling mill, pull out the roll body and axle box from the rolling mill, support the roll neck with support hardware a as shown in Fig. 1A, and install the roll in the polishing machine. A method is adopted in which the barrel c is polished with a grindstone d.

However, although the polishing method described above can improve the polishing accuracy of the roll itself, there is an error in the finishing accuracy of shaft support members such as bearings, so when it is installed and operated on a rolling mill. As shown in Fig. 5, the rotation center o' of the roll c does not coincide with the axial center o of the roll due to the eccentricity 14 of the bearing f provided between the roll neck and the axle box e. This causes roll runout, which has a large negative impact on the rolled material.

In particular, this adverse effect caused by back-water prolol has actually become a very big problem. Further, the method includes:
It is troublesome to separate the roll and axle box during roll polishing, and there is also a risk of damage to the bearing portion due to handling errors when attaching and detaching the roll and axle box.

The roll polishing method and device of the present invention have been made to solve the above problems, and the gist of the roll polishing method is to support the roll through an axle box, and to support the shaft of the axle box. The roll surface is supported through a box while being pressed from at least two directions so that a loading zone is created on the surface in substantially the same direction as when in use, and the same loading zone as when in use is created on the shaft support surface of the axle box. The purpose of polishing is to rotate and polish the roll while pressing the roll from the required direction, and the roll polishing device rotates the shaft box that supports the roll in the axial direction of the roll, in the horizontal direction perpendicular to the roll axis, and in the vertical direction. a polishing stand that is movably supported on the axle box, a presser roller device that presses the roll surface from at least two directions so that a loading zone is created on the shaft support surface of the axle box in substantially the same direction as when in use, a grindstone, and an offset joint. The present invention is characterized in that it includes a drive device that can be connected to the roll to be polished via.

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, a roll, for example, an upper backup roll, is extracted from the housing of a rolling mill together with its axle box, and the upper backup roll is attached to a roll polishing device while being assembled in the axle box, and the roll is polished. Fig. 2 is a plan view of the roll polishing apparatus of the present invention, and Fig. 3 is a side view thereof. A polishing table 6 that supports the axle box 3 on the work side of the roll 2 and a polishing table 6 that supports the axle box 5 on the drive side of the upper backup roll 2 are slidably mounted. The two polishing tables 4 and 6 are formed into an L-shape as shown in FIG. A supporting metal fitting 9 that can be pushed out in the X-axis direction (vertical direction) is provided on the base portion 10, and a supporting metal fitting 12 that can be pushed out in the X-axis direction (vertical direction) by an adjustment screw 11 is provided on the base portion 10.

The axle boxes 3 and 5 on the driving side as well as on the working side are rotated 900 degrees from their normal positions during use, and the tops of the axle boxes are placed against the wall 7.
It is placed on the polishing tables 4, 6 in contact with a support metal fitting 9 provided at the polishing table 4, 6.

Therefore, it is possible to provide the upper backup roll 2 supported by the axle boxes 3 and 5 with movement in the X-axis direction, Y-axis direction, and Z-axis direction (the axial direction of the upper backup roll) necessary for roll polishing work. I have made it possible. On the opposite side of the wall 7 of the polishing table, there is a grindstone 13 and a presser roller device 14.
is provided. The presser roller device 14 includes a plurality of presser rollers 15, a bar 16 that pivotally supports the presser rollers 15,
It consists of a hydraulic cylinder 17, and the upper backup roll 2 is tilted so that a loading zone (portion that receives the load from the roll shaft) 18 is created on the shaft support surfaces of the shaft boxes 3 and 5 in approximately the same direction as when in use (during rolling). It can be pressed against the wall portion 7 of the polishing table from above and diagonally below.

The upper backup roll 2 supported on the polishing tables 4 and 6 via the axle boxes 3 and 5 as described above is attached to the offset joint 1.
9 and a chuck 25 provided on the offset joint, it is connected to the output shaft of the drive device 20.

The offset joint 19 has a groove 21 as shown in FIG.
This is usually referred to as an Oldham's joint, and consists of two disc-shaped joint hardware 22, 26, and an intervening tool 24 with protrusions 23 formed on both sides to fit into the groove 21. Yes (details omitted).

Therefore, it is possible to easily adjust the positions of the axle boxes 5 and 3 relative to the axle center of the polishing machine and the upper backup roll. The presser roller device 14 has its hydraulic cylinder 17 attached to the polishing tables 4, 6 so that it can follow the movement of the polishing tables 4, 6, and the bearings of each axle box 3, 5 are arranged as required. It is designed so that lubricating oil can be supplied during rolling as well. The roll polishing device having the above configuration adjusts the positional relationship between the upper backup roll 2 and the grinding wheel 13 by raising, lowering and laterally moving the axle boxes 3 and 5 lying on the polishing tables 4 and 6 using the supporting hardware 9 and 12. The presser roller device 14 presses the upper backup roll 2 from diagonally above and diagonally below against the wall portion 7 of the polishing table as appropriate, and the drive device 20 is activated to rotate the grindstone 13 and perform roll polishing. do.

The upper backup roll 2 is supported via the axle boxes 3 and 5 in this manner, and the upper backup roll 2 is supported by the presser roller device 14 so that a loading zone 18 is created on the shaft support surfaces of the axle boxes 3 and 5 in substantially the same direction as during rolling. The surface of the roll 2 is pressed, and by increasing the pressing force of the presser roller device 14, the upper backup roll 2 can be rotated and polished while being supported in the same state as during rolling.

Therefore, the conditions affected by the deformation of the roll shaft box during rolling and the play of the bearings are reduced, and the problem of roll runout during use can be solved. Specifically, as shown in FIG. 5, the body of the upper backup roll 2 is precisely polished into a perfect circle around the actual rotation center 0'', regardless of the finishing accuracy of the bearing 27, so the rolling Roll runout does not occur during rolling. Therefore, highly accurate rolling can be performed. o indicates the roll axis. Note that the present invention is limited to only those shown in the above-mentioned embodiments. For example, it is possible to use a flexible joint instead of the biting joint j, and the axle box can be moved 99 degrees from the normal position.
It is not an unavoidable requirement of the present invention that the polishing table be rotated at 000 and lying down, and that the polishing table may be replaced with another shape and polished while being supported at an angle other than 900, and other gist of the present invention. Of course, it is possible to make various changes within a deviant range.

According to the present invention configured as described above, (1) the direction of the loading zone can be freely selected by appropriately adjusting the pressing force of the press roller device against the surface of the roll to be polished in each direction; If the pressing force is increased, the roll to be polished can be rotated and polished while being supported in the same state as during rolling.

(Ii) Since the roll to be polished can be rotated and polished while being supported in the same state as during rolling, the roll to be polished can be polished into a perfect circle with high precision centered on the center of rotation when installed in the rolling mill, and It is possible to eliminate roll runout and provide rolled materials with high precision.

(III) Since there is no need to separate the roll and axle box during roll polishing, the number of work steps required for polishing can be reduced.

(Iv') There is no risk of damage to the bearing due to handling errors when attaching and detaching the roll and axle box.

It is possible to achieve the following effects.

[Brief explanation of drawings]

Figure 1A is an explanatory diagram of the conventional roll polishing method, Figure 1B is a diagram showing the relationship between the axis and rotation center of a roll polished by the conventional method, and Figure 2 is a diagram showing the relationship between the axis and rotation center of a roll polished by the conventional method. FIG. 3 is a side view of the roll polishing device shown in FIG. 2, FIG. 4 is an explanatory diagram of the biting joint, and FIG. 5 is the axis and center of rotation of the roll polished by the method of the present invention. FIG. 2...Top backup roll, 3, 5...Axle box, 4
, 6... Polishing table, 9, 12... Support hardware, 8, 11
... Adjustment screw, 13 ... Grindstone, 14 ... Presser roller device, 18 ... Loading zone, 19
... Differential joint, 20... Drive device.

Claims (1)

[Claims] 1. A roll is supported via an axle box, and the roll is supported while pressing the roll surface from at least two directions so that a loading zone is created on the shaft support surface of the axle box in substantially the same direction as when in use. A roll polishing method characterized by rotating and polishing. 2. A polishing table that supports the axle box supporting the roll so that it can move in the axial direction of the roll, in the lateral direction perpendicular to the roll axis, and in the vertical direction, and a loading zone on the shaft support surface of the axle box in approximately the same direction as when in use. A roll polishing device comprising: a presser roller device that presses the roll surface from at least two directions so as to produce a grinding wheel; a grindstone; and a drive device that can be connected to the roll to be polished via an offset joint.