JPH055204U - Work roll in-line polishing machine for hot rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] In-line polishing of work rolls of hot rolling mills. [Structure] A long grindstone with a rectangular cross-section mounted on a grindstone holder, and a first pneumatic device that pushes this long grindstone together with the grindstone holder onto the work roll outer peripheral surface in the axial direction along the axial direction. And a second pneumatic device for reciprocating the grindstone holder in the axial direction of the work roll, a work roll in-line polishing device for a hot rolling mill. [Effect] The roll changing pitch becomes longer.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a work roll in-line polishing apparatus for a hot rolling mill, which is capable of polishing the work rolls of the hot rolling mill while being incorporated in a stand.

[0002]

[Prior Art]

 When the work rolls of the hot rolling mill are used for a certain period of time (about 2 weeks), the surface of the roll body becomes rough due to the hot rolled material, so the roll chock is pulled out from the stand and brought into the roll shop for roll milling. The roll body is polished until it becomes smooth. The work roll polishing work of such a hot rolling mill is carried out by taking out the roll from the stand, carrying it into the roll shop, taking out the roll chock from the roll, polishing the roll and mounting the roll chock to the roll. It has to go through the process and requires a lot of workers and working time.

[0003]

[Problems to be solved by the device]

 In the above-described conventional work roll polishing method for hot rolling mills, the roll must always be pulled out from the stand.Therefore, if abnormalities such as seizure of the rolled material on the work roll or uneven wear occur, the new roll is There is a problem that the rolling rate must be stopped during the replacement, and the operating rate is reduced accordingly.

In addition, in order to solve the above-mentioned problems, abrasive grains are mixed in a draining wiper (made of resin) that drains the rolled material so that the cooling water of the work roll does not splash on the rolled material, and the abrasive grains are mixed in-line. Although it is polished, there are the following problems.

(1) Even when it is not necessary to polish, it is always pressed. (2) The pressing force cannot be changed from outside the line. (3) The pressing force is not uniform on the driving side and the non-driving side. (4) A hardness difference occurs on the roll surface due to oxidation of the roll surface, fatigue hardening, and the like, and the drain wiper is unevenly worn.

The present invention solves the above-mentioned problems of the prior art, and a work roll in-line polishing apparatus for a hot rolling mill that can accurately perform polishing as needed with the work roll assembled in the stand. Is intended to provide.

[0007]

[Means for Solving the Problems]

 The work roll in-line polishing apparatus for a hot rolling mill according to the present invention is a long grindstone with a rectangular cross section mounted on a grindstone holder, and a work roll outer circumference in which this long grindstone is incorporated into a hot rolling machine together with the grindstone holder. A first pneumatic device for pressing the surface along the axial direction, and a second pneumatic device for reciprocating the grindstone holder in the axial direction of the work roll.

[0008]

[Action]

 The work roll in-line polishing apparatus for a hot rolling mill according to the present invention is a long grindstone with a rectangular cross section mounted on a grindstone holder, and a work roll outer circumference in which this long grindstone is incorporated into a hot rolling machine together with the grindstone holder. It is composed of a first pneumatic device that presses the surface along the axial direction, and a second pneumatic device that reciprocates the grindstone holder in the axial direction of the work roll.

Then, when an abnormality such as seizure or uneven wear of the rolled material occurs and the work roll has to be polished, the whetstone is brought into contact with the roll by the first pneumatic device, While rotating the roll, the second pneumatic device moves the grindstone back and forth in the roll axial direction.

By doing so, the work roll can be polished in a short time without being taken out from the stand. Further, during the rolling, the first pneumatic device can separate the grindstone from the roll so that the rolling is not hindered.

[0011]

【Example】

 A work roll in-line polishing apparatus for a hot rolling mill according to an embodiment of the present invention will be described with reference to FIG. The work roll in-line polishing apparatus of the hot rolling mill according to one embodiment of the present invention is provided in the vicinity of the work roll 21 incorporated in the stand, and has a cross section for contacting the work roll 21 and polishing the roll surface. Rectangular (width 60 mm, thickness 25 mm) long grindstone 1, grindstone holder 2 for mounting this long grindstone 1, support member 3 for supporting grindstone holder 2, grindstone 1, grindstone holder 2 and support member From the first pneumatic cylinder 4 that presses 3 against the roll at the same time, and the second pneumatic cylinder 6 that is built into the support member 3 and that reciprocates the grindstone 1 together with the grindstone holder 2 in the roll axial direction via the connection part 5. It is configured.

The work roll in-line polishing apparatus of this hot rolling mill will be described in more detail. The first pneumatic cylinder 4 is fixed on a fixed base, and the air pressure whose pressure is adjusted by the pressure adjusting valve 7. However, by being sent to the first pneumatic cylinder 4, the grindstone 1 is pressed against the roll 21 with an appropriate pressing force. The air pressure supplied to the second air pressure cylinder 6 passes through the air pressure switching valve 8 in which the direction in which the air pressure is supplied is different at regular time intervals by the timer, which causes the grindstone 1 to reciprocate. The grindstone holder 2 that reciprocates together with the grindstone 1 is provided with a shoe 9, and the shoe 9 reciprocates along a guide groove (not shown) provided in the support member 3, so that the grindstone 1 is a roll. Reciprocates accurately in the axial direction. Reference numeral 22 in the drawing is a roll chock of the work roll 21.

With such a configuration, when a roll surface abnormality occurs, the first pneumatic cylinder 4 is operated to bring the grindstone 1 into contact with the outer peripheral surface of the body portion of the work roll 21, and the roll 21 is removed. While rotating, the second pneumatic cylinder 6 is operated to reciprocate the grindstone 1 in the axial direction of the roll 21. In this way, the roll surface abnormality is eliminated in a short time.

When not in use, the work roll in-line polishing apparatus of this hot rolling mill operates the first pneumatic cylinder 4 to retract the grindstone 1 and the grindstone holder 2 together with the support member 3 for rolling. I try not to hinder it.

FIG. 2 shows a work roll in-line polishing apparatus for a hot rolling mill that simultaneously performs the upper work roll 21a and the lower work roll 21b while rolling the steel slab 23 with a pair of work rolls 21. It is explanatory drawing which shows the situation which is grinding. The grindstone 1 is pressed against the upper work roll 21a and the lower work roll 21b by the first pneumatic cylinder 4 fixed to the rolling stands 24a and 24b, and the grindstone holder 2 is moved by the second pneumatic cylinder 6 in the longitudinal direction of the roll ( In FIG. 2, the roll surface is ground by reciprocating in the direction orthogonal to the paper surface.

When the grinding is completed, the grindstone 1 is retracted from the rolls 21a and 21b together with the grindstone holder 2 by the first pneumatic cylinder 4. In this way, the work roll in-line polishing apparatus for this hot rolling mill can perform roll grinding without stopping the rolling work even during rolling, and the operation rate does not decrease due to roll grinding.

[0017]

[Effect of the device]

 This device has the following effects. (1) Even if seizure or uneven wear occurs on the work roll, the work roll can be immediately polished to correct the work roll, so that deterioration of the quality of the rolled product due to seizure or uneven wear of the work roll can be prevented. (2) Since the generated fatigue layer of the roll can be polished inline, the roll changing period can be extended. (3) Reclassification due to roll abnormality is reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a work roll in-line polishing apparatus for a hot rolling mill according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which upper and lower work rolls are ground by the work roll in-line polishing apparatus of the hot rolling mill according to the first embodiment of the present invention.

[Explanation of symbols]

 1 Grindstone 2 Grindstone Holder 3 Support Member 4 First Pneumatic Cylinder 5 Connection 6 Second Pneumatic Cylinder 7 Pressure Adjustment Valve 8 Pneumatic Switching Valve 9 Shoe 9

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kazuyoshi Iwashita, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Kihachi Nakamura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd.

Claims (1)

[Claims for utility model registration] [Claim 1] A long grindstone having a rectangular cross section mounted on a grindstone holder, and this long grindstone together with the grindstone holder is axially mounted on the outer peripheral surface of a work roll incorporated in a hot rolling mill. A work roll in-line polishing device for a hot rolling mill, comprising: a first pneumatic device that presses along the first pneumatic device; and a second pneumatic device that reciprocates the grindstone holder in the axial direction of the work roll.