KR940011289B1 - Grinding method of rolling roll - Google Patents

Abstract

The rolling roll grinding method is characterised by comprising grinding a whole surface or only the plate passing surface of the rolling roll when the repeated rolling is performed with material giving the same plate width, or with transfer from wide to narrow width material. The method attains a simplification of the on-line roll grinding control, a life elongation of the grinding stone, and a reduction of grinding error of the rolling roll.

Description

Grinding method of rolling roll

1 is a diagram illustrating a rolling roll grinding method according to an embodiment of the present invention.

2 is a diagram illustrating a situation of a rolling roll on-line.

3 is a side view showing a grinding mechanism.

4 is an explanatory diagram of the wear state of the rolling roll.

5 is an explanatory diagram of step grinding.

6 is an explanatory diagram of front grinding.

7 is an explanatory diagram of a grinding method of a conventional rolling roll.

* Explanation of symbols for main parts of the drawings

1: rolling roll 3: low stone

4 case 5 hydraulic cylinder

6: screw jack 7: motor

S: Rolled material

The present invention relates to a method for grinding a rolled roll that enables the reuse of the roll that is worn during rolling.

The rolling rolls for rolling the rolled material such as steel are necessarily worn. In this case, the surface of the rolled roll 1 is in the same range as the width l of the rolled material S, i.e., the plate part 1, as in the fourth degree. It is worn out and both side non-plate parts _{1 of the} plate part ₁ are not worn.

In order to eliminate the step difference between the plate part 1 caused by abrasion and the non-plate part ₁ , and to recover the surface damage of the rolled roll due to abrasion and to maintain a smooth roll surface at all times, So-called on-line roll grinding, which performs grinding, is performed.

FIG. 2 shows an example of the grinding device, in which six bottom stones 3 are installed in the case 4 while maintaining a constant distance P, and the rolling device 1 moves the entire case 4 by a moving device not shown. It moves in the horizontal direction of and grinds over the rolling roll 1 full width. 3 shows the grinding mechanism of the grinding apparatus, and the magnet 3 is pressed by the hydraulic cylinder 5 provided in the case 4 to press the roll 1 to be ground to a predetermined pressure. The case 4 is supported by the screw jack 6 and the screw jack 6 is operated by the motor 7 to serve to arbitrarily adjust the height of the bottom stone 3.

The grinding sequence in the case of grinding the roll using the grinding device will be described below with reference to FIGS. 4 to 6. In the roll surface in the rolling step between the non-abrasion and 4 the tongpan part (l) As shown in Fig wear bitter plate (l ₁₎ it is formed. The first subjected to a step grinding for grinding the step portion (a) of the non-passing plate portion (l ₁₎ formed in the roll (1) on both sides as a separate fifth dotted line in much the same level as the tongpan part (l), the sixth to the following As shown in the figure, the rolling roll 1 performs full-face grinding which grinds the full width b.

On-line roll grinding is generally performed in the form of a combination of step grinding and face grinding, while step grinding is performed throughout the rolling process, while face grinding is intermittently performed between step grinding.

In the above-described conventional grinding method, online grinding is performed while using step grinding and full surface grinding. However, for example, when rolling rolls of the same sheet width are repeatedly rolled, or when the sheet width only shifts from a wide width to a narrow width, it is not necessary to perform non-plate grinding (step grinding). It is enough to grind only the worn plate part.

However, since the regulation of the rolling order according to the sheet width of the rolled material S affects the productivity, the sheet width is actually changed arbitrarily. 7 shows an example of the rolling width and the rolling sequence, in which the rolling operation in which the rolling width (plate width) changes to the sections I) to (VII) is performed in the rolling order as in the arrow. In this case, since the narrow width is shifted in the width between the sections (I) to (VII), the grinding may be performed only by grinding the entire surface including the plate part or the non-plate part. However, conventionally, the step grinding is performed even in the section where the single grinding is not necessary, as shown in the seventh diagram and the right end. This not only increases the control regarding grinding unnecessarily but also wastes expensive stones.

In order to solve such a problem, the grinding method of the present invention presses a low stone on a rolling roll during continuous rolling to grind the rolling roll step between the plate part and the non-plate part of the rolled material, and then the non-plate part of the rolled material. In the grinding method of the rolling roll for grinding the whole surface of the rolling roll including the rolled member, only the rolled member plate part is used when repeatedly rolling the same rolled material having the same plate width and when rolling with the wider rolled material in the wide width. It is characterized by grinding the whole surface of the rolling roll or the rolling roll including the non-plate part of the rolled material.

Based on FIG. 1, the Example regarding the rolling roll grinding method of this invention is demonstrated. FIG. 1 shows the relationship between the rolling width of the rolled material and the grinding type. The vertical axis shows the rolling order, the horizontal axis shows the rolling width (plate width), and the right end shows the grinding type for each section. In this embodiment, the rolling width (plate width of the rolled material) is changed into seven types from the section I to the section VII, and the rolling is performed in the rolling order as shown by the arrow. In the above rolling sequence, the rolling width increases from section (I) to (II), decreases from section (II) to (III) and (IV), increases from section (IV) to (V), and section (V). To (VI), (VII) is decreasing. Between the sections (I) to (IV) where the rolling width increases and decreases, step grinding for grinding the non-plate part is performed in parallel, and front grinding including the plate part and the non-plate part is performed in parallel. However, only the surface grinding is performed without step grinding between the sections (V)-(VII) where the rolling width changes only from narrow to narrow.

As described above, the grinding method of the present invention performs step grinding and full-face grinding at the same time while the rolling width is increased or decreased in the sequence of rolling, but the step grinding is not performed when the rolling width is the same or unilaterally changes from the high or narrow width. Only front grinding should be done. Therefore, the unnecessary step grinding is eliminated, thereby eliminating the unnecessary step grinding control, reducing the costly low speed consumption and the grinding amount.

As a result, simplification of on-line roll eraser can be realized, at the same time, the low stone life can be reduced, and the rolling error of rolling roll can be reduced.

Claims (1)

A method of grinding a rolling roll in which a low stone is welded to a rolling roll during continuous rolling to grind the rolling roll step between the plate portion and the non-plate portion of the rolled material, and then the entire surface of the rolled roll including the plate portion of the rolled material. In the case of repeatedly rolling a rolled material having the same sheet width, or in the case of rolling to a narrow rolled material at a wide width and rolling, the rolled roll only of the rolled plate portion or a non-plate portion of the rolled material is included. Grinding method of the rolling roll, characterized in that for grinding the whole surface of the rolling roll.