JPS6244376A - Single-side shot blasting method for strip surface - Google Patents

Abstract

PURPOSE:To manufacture a single-side shot material so efficiently without entailing any warp in it, by letting two strips run on the same line as being overlapped with each other, and shot-blasting them from both upper and lower directions. CONSTITUTION:Both first and second strips 3 and 4 are uncoiled simultaneously from coils 5 and 6 by both uncoilers 1 and 2, and these strips 3 and 4 are held between upper and lower running rollers 7 and 8 as being overlapped with each other, making them run at the same speed. During this running, and shot materials are blasted toward these strips 3 and 4 from top and bottom at each of positions 9 and 10 and, after forming them into two single-side shot materials simultaneously, two unwarped single-side shot materials are uncoiled from both coilers 11 and 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for efficiently shot blasting one side of a steel strip, particularly a hot rolled strip.

[Conventional technology]

Hot-rolled strips are widely used in many fields including automobiles, and are often painted. In order to ensure paintability on the surface of this steel plate, shot blasting is usually applied.

Conventionally, when shot blasting a hot-pressed strip, as described in Japanese Utility Model Publication No. 48-13613, a coil is attached to an uncoiler on a separate line from the rolling process, the coil is uncoiled, and both sides of the strip are coated. A method is adopted in which the coil is wound onto the coiler at the other end while being shot blasted.

Further, since painting of a processed steel plate is usually done only on one side, attempts have been made to paint only on one side instead of, for example, shot blasting both sides of the strip in order to increase work efficiency.

[Problem that the invention seeks to solve]

However, when performing shot blasting on only one side, there is a drawback that warping occurs due to processing only on one side, and therefore, an additional process for correcting the warp is required, resulting in poor work efficiency.

The present invention aims to overcome the above-mentioned disadvantages of shot blasting only one side of the strip.

[Means for solving problems]

The above object of the present invention can be achieved by projecting shots from above and below while running two strips in an overlapping state on the same line.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, aspects of the present invention will be explained based on the accompanying drawings.

In the figure, 1 and 2 are uncoilers for the coils 5 and 6 of the first strip 3 and the second strip 4. Both strips 3.4 unwound from both coils 5.6 are overlapped and run at the same speed between the upper and lower running rollers 7.8, and are shot blasted from above and below at position 9.10, and the coiler It is rolled up again by 11 and 12.

The coilers 11, 12 are controlled so that the speeds of the upper and lower strips are the same. That is, strip speed detection rolls (not shown) placed in contact with the upper and lower strips respectively detect the speeds, compare the two, and use one as a reference and adjust the winding drive source of the other to eliminate the deviation. Control.

This eliminates the speed difference between the upper and lower strips and prevents the generation of rubbing pressure on the strips.

The strip running in this way is supported by pressure rolls at the front and back of the shot blasting position as necessary, but in any case, the upper and lower strips are shot in an overlapping state, just like a single strip, so the shot The strip reaction force due to this is canceled out at the top and bottom, preventing board warping.

In this way, two single-sided shot strips can be obtained at the same time by unwinding two coils at the same time, transferring them in the same line while overlapping them, and projecting both sides.

〔Effect of the invention〕

In the present invention, since two strips are overlapped and run on the same line while being shisoyotoplasted from above and below, (11) single-sided short material can be obtained without warping; (2) two single-sided strips can be simultaneously Short materials can be obtained, and the following effects can be achieved: efficiency is achieved.

[Brief explanation of drawings]

The accompanying drawings illustrate embodiments of the invention.

Claims (1)

[Claims] 1. A single-sided shot method for a strip surface, which is characterized in that two coils are simultaneously unwound on the same line and shot from above and below while traveling in an overlapping state.