JPS61296910A - Method and apparatus for grinding work roll - Google Patents

Abstract

PURPOSE:To decrease the edge drop of a rolling material and to permit an increase in the number of materials to be rolled with the same width by forming the abrasion profile broader than the sheet width of a rolling sheet on the surface of work rolls. CONSTITUTION:The upper and lower rolls 10a, 10b are provided shiftably by shifting devices 13a, 13b and belt type grinders 16a-16d are attached to side guides 13 which can be opened and closed according to the sheet width on the front of a rolling mill. The abrasion profile having the width B1+2DELTABW+DELTAS can be formed by polishing the surface of the work rolls at the same depth as the abrasion loss of the rolling material by the width DELTABW outerward from the width B1 of the rolling material with the above-mentioned constitution, then shifting the work rolls 10a, 10b symmetrical with the point DELTAS and repeating such operation. The edge drop of the rolling material is thereby decreased and the number of the materials to be rolled with the same width is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method and apparatus for grinding work rolls in a rolling mill, and in particular to an operation for forming a wear profile suitable for roll cancel-free and schedule-free rolling. The present invention relates to a roll grinding method and apparatus.

[Background of the invention]

・The conventional work roll grinding device of this type is
As described in No. 33106, a work roll (hereinafter referred to as a roll) is ground over its long body area. In addition, in the case of a known roll grinding device other than this roll grinding device, it is a narrow width grinding device that has a device movable in the roll axis direction, and this also grinds the entire roll body length like the conventional example. It is something. therefore,
These conventional roll grinding devices grind outside the roll-to-material interface and are combined with roll shifting devices to control the roll wear profile.

There was no mention of schedule-free rolling.

On the other hand, in a rolling mill equipped with a conventional work roll shift device, as shown in FIG. The work roll 1a was shifted in steps AS in accordance with the shift stroke amount S, and the shift device was reciprocated between the shift stroke amounts S, so that the wear profile due to the rolled material 2a on the surface of the work roll 1a was made into a trapezoidal shape or a smooth curve (FIG. 6). On the other hand, if the work roll 1b is not shifted, uneven wear 3 will occur on the work roll 1b due to the edge of the rolled material 2b, as shown in FIG. According to the rolling mill, it is possible to disperse the uneven wear 3.

In addition, as shown in FIG. 8 (IF), the heat crown 4a due to thermal expansion of the work roll caused by uneven temperature in the axial direction of the work roll overlaps with the work roll IC (FIG. 8 (I)). As a result, it was possible to maintain the surface shape of the work roll in the initial crown shape 5a at the initial stage of rolling, as shown in FIG. 8(m), until a certain number of rolls were rolled. However, as the wear progresses due to an increase in the number of rolls rolled, the slope of the wear profile of the work roll 1d increases due to the edges of the rolled material, as shown in FIG. 9(I), and the slope of the wear profile of the work roll 1d increases as shown in FIG. The offsetting effect of Crown 4b is also the 9th.
As shown in the profile 5b of FIG. 9(m), the edge drop ED of the rolled material 2c is reduced as shown in FIG. 9(IV).
There was a problem in that the edge-up phenomenon increased and a local edge-up EU phenomenon was observed.

In addition, changing the width of rolled material within the same rolling cycle,
In particular, when changing the width from the narrow material B1 to the wide material B2, the width change amount ΔB=82-B□ (see FIG. 10 (1)) was limited by the shift stroke S. For example, looking at only one stand, the wear width formed by a rolled material with a plate width of B1 is B1+S (see Fig. 10 (II)), and the wear width of the upper and lower work rolls is By overlapping the fills, the wear width is B1+2
8, it is possible to change the width up to ΔB=2S, but since the wear width is limited by the shift position of the upper and lower work rolls, it is actually not possible to change the width up to ΔB=S. There wasn't.

[Purpose of the invention]

An object of the present invention is to provide a roll grinding method and apparatus for forming a work roll wear profile that enables roll chance-free and schedule-free rolling in a rolling mill equipped with a work roll shift device.

[Summary of the invention]

The present invention focuses on the fact that the increase in edge drop, local edge up, and the limit on the strip width change amount ΔB are in the wear profile due to the narrow width material B1, and when rolling with a narrow width, it is as if a wide material was rolled. By forming a wear profile, limitations on edge drop, local edge up, and plate width change amount ΔB are significantly relaxed. That is, the present invention is as shown in FIG.

Upper and lower work rolls 10a and 10b are placed in a bearing box (chock)
12a, 12b, 12c, and 12d, and the upper and lower work rolls 10. a, 10b can be shifted in the axial direction symmetrically with respect to the upper and lower points, and devices 14a, 1 are provided on the front or rear surface of the rolling mill (rolled material entry side) to open and close according to the width of the rolled material 9.
4b is installed, and the work roll 10a is placed on the open/close bag [14a, 14b].

・Upper roll DS, WS and lower roll DS of 10b.

Grinding device 15 a + 15 b y 15 c that has a grinding width ΔBW so that WS (outside the part with plate) can be ground
A total of four *15d are installed, and as the rolled material 9 with a plate width B□ approaches, the opening/closing devices 14a and 14b are opened to the same width as the plate width B1, and the rolled material 9 is moved to the work rolls 10a and 10b.
It is configured to bite into and roll it.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a plan view of essential parts of the same embodiment. An example will be explained in which a side guide is used as the device 13 that opens and closes depending on the width of the plate, and a belt type grinder 16 is used as the roll grinding device 15.

In FIG. 2, upper and lower work rolls 10a.

10b and upper and lower reinforcing rolls 20a and 20b constitute a four-stage work roll shift rolling mill. The upper and lower work rolls 10a and 10b are held by bearing boxes 20a and 20b, and are movable in the axial direction by shift devices 13a and 13b, respectively. Front of rolling mill (
Side guides 13a and 13b that open and close according to the width of the rolled material 9 are installed on the rolled material entry side).
Belt type roll grinders 16a, 16c and 16b, 1
Install 6d. Belt type roll grinder 16a,
16c, 16b, and 16d are connected to the operating side and the driving side by a spline 18, and are driven by a motor 19, and are connected to the cylinder 16a.

Work roll 10a by 16c, 16b, 16d.

It is pressed against the surface of 10b and ground.

When the rolled material 9 enters, the side guide 13a.

13b is opened and closed by cylinders 21a and 21b according to the width of the rolled material 9, and the rolled material 9 is connected to the side guide 13a.
, 13b, and the upper and lower work rolls 10a, 10
Caught between b. Belt type roll grinders 16a, 16b after the rolled material 9 is bitten.

16c and 16d are driven by a motor 19 and a spline 18, and cylinders 17a, 17b, and 47c.

17d, it is pressed against the surfaces of the work rolls 10a and 10b. The relationship between the speed of the belt 16 and the amount of grinding is shown in Figure 4, rolling conditions (rolling load, plate width, rolling length, roll diameter, etc.)
The relationship between the amount of wear and the amount of wear is as shown in FIG. 5. By determining the rolling conditions, the amount of wear is determined from FIG. 5, and from this amount of wear, the belt speed is determined from FIG. 4. As a result, the work roll surface has a width ΔB outside the width edge of the rolled material 9.
Grinding is carried out over W to a depth of 8, which is the same as the amount of wear caused by the rolled material, to form a wear profile of B1+2ΔBW, which is wider than the rolled material plate width B1. Work roll 1 is used before removing ash from the rolled material.
Remove the grinder 16 from the surfaces of 0a and 10b, and shift the first work roll 78 points symmetrically to remove ash in preparation for the next rolling material.By repeating this operation, B1+2ΔBW+Δ
A wear profile with a width of S is formed, and by repeating shift grinding, a wear profile with a width of B1+2ΔBW+S can be formed.

Thus, at the same time as rolling, the grinding device 15 (16) is pressed against the surface of the work roll loa, 10b just outside the end of the rolled material 9, and as shown in FIG.
The grinding width of W is ground to a depth equal to the wear amount (depth) 8 when rolling one rolled material. After grinding and rolling, Fig. 10 (
As shown in n), it is possible to obtain the same wear profile as when rolling a rolled material having a plate width of B1+2ΔBW.

When rolling the next material, the upper work rolls 10a and 10b are shifted in the axial direction point-symmetrically by AS by the shift devices 113'a and 13b, and as shown in FIG. 10(n), the wear profile has a wear profile of 81+2ΔBW. are overlapped with AS shifted, and a wear profile having a width of B machining + 2 ABW + ΔS is formed. Thereafter, by repeating the shift grinding between the shift strokes S, B, +2ΔBW+
It becomes possible to obtain a wear profile with a wear width of S. As a result, even if the same width B1 material is continuously rolled,
It is possible to alleviate edge drop ED and local edge up EU due to the progress of wear, and it is expected to increase the number of rolls of the same width rolled, and also to reduce the amount of width change from narrow material to wide material within the same rolling cycle. It becomes possible to expand to ΔB=2ΔBW+S.

The above embodiment has been described using a belt-type roll grinder m, but it is of course possible to use a grindstone-type roll grinder m instead.In this case as well, the operation is performed by the belt-type roll grinder m. It is the same as in the case of , and the effect is also the same.

As described above, according to this example, a wide wear profile can be formed and edge drops at the ends of the rolled material can be reduced as wear progresses, so the number of rolls of the same width can be increased and heat crowns can be overlapped. Because the local edge-up that occurs in the case of grinding can be reduced, plates with excellent shapes can be produced.Moreover, when rolling a wide material after rolling a narrow width material, the width return amount can be changed from the conventional shift stroke S to the grinding width BW + S.
It can be expanded to

〔Effect of the invention〕

As described above, according to the present invention, it is possible to form a wider wear profile on the surface of the work roll than the width of the rolled material plate.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing the basic equipment configuration of the present invention, Figure 2 is a configuration diagram showing the basic equipment configuration of the present invention.
3 is a plan view showing the main parts of the embodiment, FIG. 4 is a characteristic diagram showing the relationship between the amount of grinding and belt speed in the embodiment, and FIG. The figure is a characteristic diagram showing the relationship between rolling parameters and the amount of wear. Figure 6 is a diagram showing the wear profile of the work roll surface during rolling with the same width when the work roll is shifted. Figure 7 is a diagram showing the wear profile of the work roll surface when the work roll is shifted. Figure 8 is a diagram showing the wear profile when no roll shift is performed, Figure 8 is a diagram showing the composite profile of the wear profile and heat crown in the first half of the rolling cycle, and Figure 9 is a diagram showing the case where rolling has entered the second half in Figure 8. 10 are diagrams showing the wear profile of the present invention. 9... Rolled material, 10... Work roll, 13... Work roll shift, 14... Opening/closing device, 16... Belt type roll grinder, 17... Cylinder, 18...
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,・・Representative Patent Attorney Katsuma Ogawa: ゛First Shoulder Mouth riA Meikin Towa 1t<Rame-y't(e, atu, y,
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Claims (1)

[Scope of Claims] 1. In a work roll grinding method that includes a grinding device for grinding a work roll and grinds the work roll to form a predetermined wear profile, a rolled material of a predetermined width is rolled. The work rolls on both sides of the plate width are ground to form a wear profile with a constant wear width, and when rolling the next rolled material, the upper and lower work rolls are shifted symmetrically in the axial direction, and while repeating this operation, A work roll grinding method characterized in that a wear profile having a wider wear width than the above wear profile can be formed by reciprocating between shift rotors. 2. The work roll grinding device is equipped with a grinding device that grinds the work roll to form a predetermined wear profile.In the work roll grinding device that grinds the work roll to form a predetermined wear profile. Accordingly, an opening/closing device that opens and closes in the sheet width direction is provided, and a grinding means for grinding the outer width of the upper and lower work rolls from the boundary with the rolled material is provided on the opening/closing device, and a shift device that shifts the work rolls point-symmetrically is provided. A work roll grinding device characterized by being equipped with a device.