JPH05237518A - Manufacture of rolling roll - Google Patents

Abstract

PURPOSE:To inexpensively and efficiently manufacture a rolling roll and to easily avoid contact seizure in an annealing time by making the Rsk of a steel plate which has been rolled by this roll sufficiently large. CONSTITUTION:The graph shows the Rsk of the roll after two times of dull working. The axis of ordinate shows the Rsk after the 2nd shot blast and the axis of abscissa shows the grit number of the 2nd shot blast by the ratio to the 1st one. The 1st shot blast is executed with the grit number of #120 and #240. When the 2nd grit number is between 1/3 and 2/3 of the 1st grit number, the Rsk of the roll is known to be -0.6 to -0.3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold rolling roll manufacturing method for controlling the surface roughness Rsk (meaning skewness index) of a cold rolling dull roll to -0.3 or less. is there.

[0002]

2. Description of the Related Art The surface roughness of a cold rolling mill roll is appropriately controlled to an optimum value depending on the required performance of a steel sheet.
Of these, the surface roughness of the steel sheet used for the shadow mask is set to 0.3 ≦ Ra ≦ in order to properly secure the air flow path during evacuation of the glass reference pattern after photoresist coating in the etching step. It is preferable to control to 0.8. However, since a thin plate for a shadow mask is annealed at a high temperature after several hundreds are laminated after etching, adhesion seizure occurs after annealing and the yield is significantly reduced. In addition, the same adhesion problem occurs during tight coil annealing in the manufacturing process of general cold rolled steel sheets.

In order to solve these problems, it is thought that many convex portions are generated on the surface of the steel sheet to reduce the substantial contact area of the coil surface which is laminated or tightly wound to prevent the sticking seizure. was suggested. As a method,
As disclosed in Japanese Patent Laid-Open No. 62-238003, it has been proposed to polish a dull-processed roll and roll it by using this roll so that Rsk on the surface of the steel sheet becomes 0 or more.

However, it is difficult for the polishing of the roll to secure the uniformity of the roughness in the longitudinal direction of the roll. Further, as can be seen from the fact that the Rsk in the example of this publication is about +0.2, the Rsk of the roll cannot be sufficiently secured, and it cannot be said that the adhesion seizure can be sufficiently prevented. According to the knowledge of the present inventors, in order to prevent adhesion seizure,
Rsk of steel plate needs to be at least +0.3 or more,
Further, the Rsk of the rolling roll for obtaining it is −0.
3 or less is required.

[0005]

The problem to be solved by the present invention is to solve the above problems. That is, not only the shadow mask thin plate,
In order to obtain a steel plate surface for preventing adhesion seizure during tight coil annealing of a general cold rolled steel plate, Rsk of a rolling roll is used.
To obtain a value of −0.3 or less.

[0006]

[Means for Solving the Problems] As means for solving the above problems, the present invention uses a shot blast to perform a first dulling process on a rolling roll, and thereafter, to use the first dulling process. The surface roughness of the rolling roll was reduced by subjecting the rolling roll to the dulling by the second shot blasting using the 1/3 to 2/3 grit of the shot blasting grit. 0.
6 ≦ Rsk ≦ −0.3, which is a method for manufacturing a rolling roll.

[0007]

Next, the operation of the present invention will be described. The first shot blasting is applied to the surface of the rolling roll to sufficiently secure sharp unevenness. The second shot blast grit count is set to 1/3 to 2/3 of the first shot blast count and shot blasting is performed. As a result, grit having a larger grain size is used than in the first time, and only the convex portion is appropriately destroyed as shown in FIG. 2 among the irregularities having a short pitch formed in the first time.

When the grit count is 2/3 or more, since the grit particle size is not so different from the first time, only the convex portion formed at the first time cannot be destroyed and even the concave portion is destroyed.
Sk does not fall below -0.3. Grit count is 1/3
In the following cases, the grain size becomes too large and all the irregularities formed at the first time are destroyed, and again, Rsk is-.
It cannot be less than 0.3. By this processing method, it is possible to obtain a roll surface mainly composed of concave portions, and
k can be −0.3 or less.

[0009]

EXAMPLE FIG. 1 shows the Rsk of a roll obtained by the present inventor after two times of dull processing. The vertical axis represents Rsk after the second shot blasting. The horizontal axis shows the grit count of the second shot blast compared to the first shot grit. The grit count of the first shot blast was # 120 and # 240. From FIG. 1, it can be seen that when the grit count of the second time is 1/3 to 2/3 of the grit count of the first time, the Rsk of the roll is −0.3 or less and −0.6 or more.

FIG. 2 shows a roll profile after the first shot blasting and a roll profile when the shot blasting is performed at the second grit count of 1/2.

[0011]

As described above, according to the present invention, Rsk-
A rolling roll of 0.3 or less can be manufactured inexpensively and efficiently. In addition, Rs of the steel sheet after rolling using this roll
Since k can be set to a sufficiently large value, adhesion seizure during annealing can be easily avoided. Therefore, the yield can be easily improved, and the invention has great industrial value.

[Brief description of drawings]

FIG. 1 shows the Rsk of a roll obtained by two times of dulling.

FIG. 2 is a conceptual diagram of a roll profile after the first shot blasting and a roll profile when the shot blasting is performed at a second grit count of ½.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Ishikawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A rolling roll is first dulled using shot blasting, and then 1/3 to 2/3 of the shot blasting grit count used in the first dulling. The surface roughness of this rolling roll is -0.6≤Rsk by subjecting the rolling roll to dulling by the second shot blasting using grit.
<=-0.3, The manufacturing method of the rolling roll characterized by the above-mentioned.