JPH09309059A - Method for removing oxide film from steel sheet - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To perform highly efficient descaling treatment in one pass in removing oxide film of steel sheet by brushing with a brush roll in which bristles containing abrasive grains are densely mounted on the circumferential surface of a roll shaft. It can be applied, and yet this can be achieved under fairly fast line speeds. SOLUTION: An oxide film removal line L of a steel plate having a brush roll B in which abrasive grains-containing bristles 1 are densely mounted on a peripheral surface of a roll shaft 3 is cold-rolled at an elongation rate of 18 to 35%. It is characterized in that the strip-shaped steel plate S is continuously passed, the brush roll B is rotated in the forward direction and the forward direction of the strip-shaped steel plate S passing therethrough, and the steel plate is descaled by brushing with the brush roll B. To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an oxide film from a steel sheet, and more particularly, to removing an oxide film (hereinafter referred to as descaling) by brushing with a brush roll in which bristles containing abrasive grains are densely mounted on the circumferential surface of a roll shaft. The present invention relates to a method for removing an oxide film from a steel sheet.

[0002]

2. Description of the Related Art It is already known that descaling of a steel sheet is carried out by brushing with a brush roll in which bristles containing abrasive grains are closely packed on the circumferential surface of a roll shaft. However, in the conventional method, the descaling amount, that is, the scale removal rate was not always good. Incidentally, conventionally, a steel plate is generally passed through an oxide film removal line a plurality of times, and a pickling treatment is further applied to the line to obtain the required descaling result.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to achieve a considerably high descaling efficiency in one pass, that is, to pass the steel sheet once through the oxide film removal line in the oxide film removal treatment of the steel plate of the above-described mode. The goal is to be able to achieve this at fairly high line speeds.

[0004]

In order to solve the above problems, in the present invention, as a brush roll provided in an oxide film removal line of a steel sheet, a bristles containing abrasive grains are densely mounted on the circumferential surface of the roll shaft to fill the brush roll, A strip-shaped steel sheet that has been subjected to cold rolling with an elongation rate of 18 to 35%, preferably 20 to 30% is treated, is continuously passed through the line, and is descaled by brushing with the brush roll. The brush roll is rotated in the forward direction along with the progress of the strip steel plate.

According to the method of the present invention, it has been experimentally found that the oxide film on the strip steel sheet can be removed by brushing with the brush roll with considerably high efficiency, and that this can be achieved by one pass. It was confirmed from the result.

Incidentally, in the present invention, the oxide film removal treatment of about 4.5 times or more of the oxide film removal treatment of the present invention, which has a good descaling ratio of the conventional method of removing the oxide film of the steel sheet, is
One pass, that is, a single pass of the steel sheet through the oxide film removal line, can achieve the preferable result obtained by the above-mentioned brushing treatment. Moreover, this can be achieved by treating the steel sheet at a line speed of 200 m / min.

Therefore, according to the present invention, the running cost for removing the oxide film on the strip steel sheet can be sufficiently reduced as compared with the conventional case.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In the figure, a reference numeral B is a brush roll, and bristles 1 containing abrasive grains are densely mounted on the peripheral surface of the roll shaft 3 of the brush roll B.

In such a bristle, a plurality of bundles of resin filament yarns containing abrasive grains are covered with a thin and multi-filament yarn of a right and left double spiral wound resin and subjected to resin treatment (resin processing). Impregnated), a bundle of similar filament yarns is covered with a braid of thin resin multifilament yarns,
A resin-processed (resin-impregnated) material may be added to it. Such bristles and resin filament yarns containing abrasive grains, which are the elements thereof, are known per se, and therefore the disclosure by the drawings is omitted.

The required bristles can be mounted densely on the peripheral surface of the roll shaft 3 by the following specifications.

A large number of annular brush disks D as shown in FIG. 3 (A), in which the required bristles are densely planted on the periphery,
The roll shaft 3 is attached to the shaft 3 by being fitted on the peripheral surface of the roll shaft 3, compressed in the length direction of the shaft 3, and tightened.

Alternatively, a brush element b as shown in FIG. 3 (B), which is obtained by densely implanting the required bristles 1 on a metal groove-shaped support 2, is closely spirally formed on the peripheral surface of the roll shaft 3. It is attached to the shaft 3 by winding it and fixing it.

A brush disk D as a brush roll element as shown in FIG. 3A and a brush roll element b as shown in FIG. 3B are brush rolls which are used to remove the oxide film on the steel sheet. As elements are well known in this type of technical field, only the outline is shown in the figure. Also, the shaft 3 of the brush disk and the brush roll element
Since the attachment to the device is also known per se, the description here will be omitted.

The brush rolls described above are known per se and are outlined in FIG.

The brush roll B is arranged in the oxide film removal line L for the strip steel plate. A backup roll R is installed in the line L.

Elongation rate 18-35%, preferably 20-30
% Of the strip-shaped steel sheet S subjected to cold rolling, the strip-shaped steel sheet S is continuously passed through the oxide film removal line L, and the brush roll B is rotated in the forward direction and the forward direction of the strip-shaped steel sheet S passing therethrough. The strip steel plate S is descaled by brushing with the brush roll B.

In this way, the desired result is obtained. next,
Table 1 shows the results of experimental examples according to the present invention.

[0019]

[Table 1]

The experimental results shown in Table 1 are as follows.

Brush roll; outer diameter 420 mm, length 75
0 mm brush roll bristles; grain size jis # 100 with abrasive grains (mixed amount (weight ratio) 25%) 3 1.6 mm diameter monofilament yarns of resin are aligned, and ultra-fine multifilament yarns are wound right and left. Double spiral wound, resin processed (impregnated with resin) Brush roll rotation speed: 1200r, p, m Brush roll reduction (amount of brush roll pressed against test material); 3.0mm Material: Cold rolled SPHE Number of times the test material is threaded: 1 Line speed: 200 m / min Spray; Water at 50 ° C is sprayed at 5 liters per minute over the entire width of the brushing part of the test material Table 1 Here, the vertical axis represents the scale removal amount, and the horizontal axis represents the cold rolling elongation of the test material.

As is clear from Table 1, according to the method of the present invention, it is possible to perform the descaling treatment with considerably high efficiency on the steel sheet, and it is possible to obtain the preferable result in one pass. Of. Moreover, this is 200m /
It can be achieved at a line speed as high as min.

[0023]

As described above, according to the present invention, in a process of removing an oxide film from a steel sheet in which brushes containing abrasive grains are densely mounted on a roll shaft peripheral surface and brushing is performed by a brush roll, a very high removal rate can be achieved in one pass. Scale efficiency is obtained,
Moreover, it has the effect of achieving this at a considerably high line speed.

[Brief description of drawings]

FIG. 1 shows a schematic front view of a brush roll used in the method of the present invention.

FIG. 2 is a side view showing an outline of a steel plate oxide film removal line according to the method of the present invention.

FIG. 3 (A) is a perspective view of an annular brush disk as an example of a brush roll element applied by the method of the present invention, and FIG. 3 (B) is another example of the brush roll element applied by the method of the present invention. It is a perspective view shown.

[Explanation of symbols]

 1 Bristles with abrasive grains 3 Roll axis B Brush roll b Brush roll element D Disk as brush roll element L Steel plate oxide film removal line S Strip steel plate

Claims (2)

[Claims] 1. A strip-shaped steel sheet, which is cold-rolled with an elongation of 18 to 35%, is attached to an oxide film removal line of a steel sheet having a brush roll in which bristles containing abrasive grains are densely mounted on the circumferential surface of a roll shaft. Continuously passing, the brush roll is rotated in the forward direction and the forward direction of the strip-shaped steel sheet to be passed, the brush-shaped steel sheet is brushed by the brush roll, and the oxide film of the steel sheet is removed. Oxide film removal method. 2. A strip steel sheet to be brushed has an elongation of 20.
The method for removing an oxide film from a steel sheet according to claim 1, wherein the steel sheet is cold-rolled by 30%.