JPS6020085B2 - On-line polishing equipment for rolling rolls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an on-line polishing device for mill rolls.
More specifically, the present invention relates to an apparatus for polishing a work roll of a rolling mill while it is still attached to the rolling mill.

As a result of repeated use, the work rolls of a rolling mill gradually wear out their surfaces and end up with a roll profile that is different from the initial roll crown. Must be corrected.

The conventional polishing work of work rolls of rolling equipment is
This is done after the rolls are removed from the rolling equipment and transported to the polishing factory, so not only does it take a great deal of time and effort to remove, restore, and transport the work rolls, but it also requires a lot of time and effort. This is uneconomical as it prolongs the downtime of the line.

In order to extend the working time of the work roll until the next polishing, measures are taken such as creating a roll chance from a material with a wide rolling width to a material with a narrow rolling width, or changing the widthwise position of the material being rolled by changing the width of the material being rolled. A method of uniformizing roll wear by controlling the movement of the roll in the longitudinal direction of the roll has been proposed, but there are many restrictions on implementation and there are limits to the effectiveness. Therefore, if the work rolls are polished in their used state without being removed from the rolling mill, the labor and time required for polishing can be reduced, downtime of the rolling line can be shortened, and the efficiency of polishing work can be improved. can. SUMMARY OF THE INVENTION An object of the present invention is to provide an on-line polishing device that is simple in structure and operates reliably, which can polish work rolls of a rolling mill while mounted on the rolling mill at a use position.

According to the invention, at a location parallel to the work rolls of the rolling mill and symmetrical to the crown of the work rolls, a criterion equal to the sum of the initial crown of the work rolls and the thermal crown created during rolling is provided. A support beam 4 is provided with a convex crown of the reference value and is attached to a frame on the bearing box so as to be reciprocatable in the direction of approaching and moving away from the work roll; An on-line polishing device for mill rolls is obtained, which comprises a polishing roll 3 with a rotary brake and a drive mechanism 5, 5 for pressing the support beam 4 onto the work roll 2 via the polishing roll 3.

Now, an embodiment of the apparatus of the present invention will be described below with reference to the accompanying drawings.

Referring to FIG. 1, there is shown an apparatus 10 of the present invention comprising a work roll 2 placed under a backup roll 1 and a polishing roll 3 pressed against the work roll.

As shown in FIG. 2, a beam-shaped frame 6 of the apparatus 10 of the present invention is fixed to a bearing box (not shown) of a work roll 2 and is configured to move up and down together with the work roll 2.

The frame 6 has a pair of protrusions 6A separated by a predetermined distance L.
, 68 are attached to the top surface. The pair of protrusions 6A, 6B are provided with grooves 11 on mutually opposing surfaces.

An elongated support beam 4 is attached to the frame 6 so as to be movable up and down, and has projecting twills 12 at both ends that connect to the grooves 11 of the pair of projections 6A, 6B.

Therefore, the support beam 4 can reciprocate toward and away from the work roll 2. The support beam 4 is provided with a convex crown 14 on the left half thereof at a position symmetrical to the convex crown 13 of the work roll 2 and having a reference value equal to the sum of the initial crown of the work roll and the thermal crown generated during rolling,
It has a straight support part on the right half. work·
A polishing roll 3 having a recessed crown 15 corresponding to the crown 14 corresponding to the sum of the initial crown of the roll 2 and a thermal crown due to thermal expansion occurring during rolling has its rotating shaft 16 mounted on a bearing 7, 7, it is rotatably supported on the support beam 4. Pads 7', 7' made of a flexible material such as hard urethane or rubber are inserted between the lower ends of the bearings 7, 7 and the support beam 4, respectively. A speed reducer 8 and a rotation drive source 17 such as a motor are connected to the rotation shaft 16 of the polishing roll. Furthermore, a brake side 9 is attached to the right end of the rotary drive source 17. Drive mechanisms 5, 5 such as hydraulic jacks are installed between the upper surface of the frame 6 and the lower surface of the support beam 4.
is pressed against the work roll 2 together with the polishing roll 3. During operation, rolling work is performed after installing a new roll, and when the wear of the work roll 2 reaches a point where rolling is hindered, the pressing drive mechanisms 5, 5 are activated and the polishing roll is moved through the support beam 4. 3 is pressed onto the work roll 2 and crimped.

The pressing force shall be 115 tons/meter relative to the length of the roll body. Furthermore, the polishing roll 3 is preferably made of a highly hard material, with a tensile strength of 70k.
It is best to use wear-resistant steel with a grade of G'Iso or higher. Also polished.
The crimping of the roll 3 may also be carried out during the rolling operation of the work rolls, using a rest period. After the polishing roll 3 is pressed onto the work roll 2, the brake 9 is activated to hold the polishing roll 3 in a non-rotating state.

Because work roll 2 is rotating, work roll 2
Friction occurs at the contact point A between the polishing roll 3 and the workpiece.
The roll 2 is ground by a polishing roll 3 to correct the desired crown. Note that at this time, rotational force is applied to the polishing roll 3 due to friction with the work roll 2, but frictional force is also generated at the contact area between the polishing roll 3 and the support beam 4, and the rotational force is canceled out. Therefore, the braking force of the lateral brake machine 9 may be relatively small. When the crown of the work roll 2 is corrected, the pressing drive mechanisms 5, 5 are moved back, the polishing roll 3 is separated from the work roll 2, and the polishing work is completed. Note that at the same time as the work roll 2 is being polished, a portion of the polishing roll 3 corresponding to the width △b is worn out as shown in FIG. Rotate it by a relatively small angle to prepare for the next polishing. Therefore, the next polishing operation can be performed with a completely new polishing roll surface. The period of polishing work,
The polishing time and the rotation angle 81 of the polishing roll may be determined from actual values depending on the materials of the work roll 2 and the polishing roll 3, and the number of rolling tons, or may be determined using an ultrasonic distance meter (not shown) attached to the frame 6. The polishing may be carried out while monitoring the wear state and polishing state of the work roll 2.
/Furthermore, in this example, polishing of a convex crown type work roll was illustrated, but in the case of a concave crown type work roll, a convex crown can be achieved by providing a convex crown on the polishing roll and a concave crown on the support beam. It can be polished on-line just as in the case of type work rolls.

. In a specific embodiment of the apparatus of the present invention, a plate rolling mill is equipped with a Heinitzkelgren roll having a diameter of about 100 mm.
After rolling for 58 minutes, a polishing roll with a diameter of 30 mm made of wear-resistant steel with a tensile strength of 78 k9/rail was applied to the length of the roll body.
It was pressed at 2.5 T/force and polished for 2 minutes, and this process was repeated 6 times.

Next, the polishing roll 3 was rotated by 0=2o. 8 more
Position E rolling and polishing for 2 minutes were repeated 6 times, and the polishing roll 3 was rotated 20 times. In this way, the polishing roll 3
When the crown of the work roll 2 was examined after half of the circumference was used, that is, after 4200 rolls of rolling, the crown remained almost the same as the initial one. With the previous construction method, approximately 3
Rolls had to be changed every 50 times, but when using the device of the present invention, not only can the roll change time be extended by about 12 times, but there is no roll chance at all during that time. It has the advantage of being able to perform rolling operations without being constrained. According to the present invention, polishing can be carried out while the work roll 2 is idling when the rolling machine is not in operation, and also polishing can be carried out freely during the rolling operation.

The device of the present invention has other advantages such as having a simple structure, being easily and inexpensively installed in an existing rolling mill, and being applicable not only to thick plate rolling mills but also to all steel plate rolling machines. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the device of the present invention pressed against a work roll of a rolling mill, FIG. 2 is a side view of the device shown in FIG. 1,
3 is an enlarged view showing the main parts of the apparatus shown in FIG. 1, and FIG. 4 is a sectional view taken along the line WW in FIG. 2. 1"""/pickup roll, 2"M" work roll, 3...polishing roll, 4...support beam, 5...press drive mechanism, 6 ... Frame, 7 ... Bearing, 8 ... Rotating drive mechanism, 9 ... Control mechanism, 10 ... Device of the present invention, 11...Groove, 12...Protrusion,
13. ．．・．． ．．・Work roll crown, 14...
... Crown of support beam, 15 ... Crown of polishing roll, 16 ... Rotation axis, 17 ...
··drum. Figure 1 Maple Kaya Figure 3 Kaya Figure 4

Claims (1)

[Claims] 1. A convex crown with a reference value equal to the sum of the initial crown of the work roll and the thermal crown generated during rolling is arranged parallel to the work roll of the rolling mill and symmetrically to the crown of the work roll. A support beam 4 is provided and attached to a frame on a bearing box so as to be reciprocated in the direction of approaching and moving away from the work roll, and has a concave crown having the reference value, and is rotatably attached on the support beam and has a rotational braking mechanism. An on-line mill roll polishing device comprising a polishing roll 3 and a drive mechanism 5, 5 for pressing the support beam 4 onto the work roll 2 via the polishing roll 3.