JPH0624698B2 - Steel plate surface treatment method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for surface treatment of a steel sheet, in which a cleaning material such as shots or grit is projected onto a steel sheet by a centrifugal projection device to remove scale.

(Prior Art) In recent years, in order to remove scales generated on the surface of steel sheets produced by hot and cold rolling mills, as shown in FIG. A surface treatment method is carried out in which a blast cleaning material (13) is projected toward a steel plate (11) by a projection device (12). In this case, the abrasive cleaning material (13) projected from the plurality of centrifugal projection devices (12) is projected such that its projection area spreads in the plate width (d) direction of the steel plate (11),
The steel plate (11) is impacted by the abrasive material (13) when it strikes the steel plate.
The scale generated on the surface of (11) is peeled off.

(Problems to be Solved by the Invention) However, in the conventional case as described above, it is possible to perform descaling with high efficiency without pollution, but it is possible to remove the cleaning agent (13) by the centrifugal projection device (12). Since the projection area is wide and constant in the plate width (d) direction of the steel plate (11), the projection area width of the abrasive material (13) is controlled by controlling the number of operating centrifugal projection devices (12). Even if you try to adjust, there is a problem that the adjustment width becomes too large to accommodate the width of the plate width (d), and when processing a steel plate (11) with a narrow plate width (d), it is projected unnecessarily. The amount of the waste hammering and cleaning material (13a) to be used increases, the projection efficiency is lowered, and the waste hammering and cleaning material (13a) directly collides with a cabinet (not shown), which causes early wear of the cabinet.

(Means for Solving Problems) The present invention has been completed with the object of a method for surface treatment of a steel sheet having high projection efficiency that solves the above problems. In the surface treatment method of the steel sheet, in which the scale of the steel sheet surface is removed by projecting it toward the moving steel sheet, the projection direction of the polishing and cleaning material projected from a plurality of centrifugal projection devices is directed toward the moving direction of the steel sheet. The material is projected onto a plurality of narrow projection areas with a small width in the width direction of the steel sheet, and the steel cleaning material that collides and reflects on the steel surface does not interfere with the subsequently projected steel cleaning material. It is characterized in that projection is performed at a projection angle that forms an acute angle with respect to the width direction.

(Embodiment) Next, an embodiment showing the present invention with reference to FIG. 1 and FIG. 2 will be described in detail.

(1) is a steel plate that is surface-treated so that it moves in one direction, and a plurality of centrifugal projection devices that are juxtaposed below it.
(2), the projection direction of the abrasive cleaning material (3) projected by the rotation of each impeller of (2) is directed to the moving direction of the steel plate (1), and each projected abrasive cleaning material (3) is a steel plate. Board width of (1)
(d) Projected to a plurality of narrow projection areas with a small width in the direction (d), and the projected cleaning material (3) collides with the steel plate (1) and is reflected in the direction of the centrifugal projection device (2). The sharpening angle β ° that does not interfere with the succeeding abrasive cleaning material (3) projected one after another is inclined relative to the width direction of the steel sheet (1). The projection of (3) is performed on the steel plate (1) at an inclination angle that forms a required acute angle in both the moving direction and the plate width (d) direction.

Therefore, if a plurality of centrifugal projection devices (2) and (2) are projected onto the surface of the steel plate (1) that moves in one direction, the cleaning and cleaning material (3) can be used to obtain the respective cleaning and cleaning material (3). Is projected onto a plurality of narrow projection areas with a small width in the plate width (d) direction of the steel plate (1), and at the same time, the plurality of projection areas are combined in the plate width (d) direction to create a board width (d). d) An effective projection area is formed over the entire area, and as a result, the number of operating centrifugal projection devices (2), (2)
By adjusting according to (d), it is possible to reduce the amount of waste hammering and cleaning material (3a) that is wastefully projected, and also the projection angle with respect to the plate width (d) direction of the steel plate (1). Acute projection angle β °
By doing so, the abrasive cleaning material (3) that collides with and reflects the steel plate (1) can avoid interference with the subsequent abrasive cleaning material (3), and the energy loss due to the collision of the abrasive cleaning materials However, the projection efficiency of the cleaning material (3) is greatly improved as compared with the conventional case. In addition, board width 60
The surface treatment of the steel sheet by the conventional method shown in FIG. 3 and the surface treatment of the steel sheet by the method of the present invention shown in FIG. 1 and FIG. According to the result of measuring the degree of scale drop occurring on the surface of the steel sheet by changing the moving speed, according to the method of the present invention, the scale falls even if the moving speed of the steel sheet is twice or more that of the conventional method. It wasn't too bad.

(Effects of the Invention) As is apparent from the above description, the present invention provides a method for surface treatment of a steel sheet by removing the scale of the steel sheet surface by projecting the abrasive material from a plurality of centrifugal projection devices onto the moving steel sheet. By using a unique projection angle with respect to the material projection direction and the steel plate width direction, it is possible to control the number of operating centrifugal centrifugal projection devices according to the steel plate width, thus wasting the cleaning material. It is possible to reduce the number of projections and reduce the energy loss due to the collision of the cleaning and cleaning materials.
As a result, the projection efficiency of the abrasive material can be greatly increased as compared with the conventional case, and the industrial value is extremely large.

[Brief description of drawings]

FIG. 1 is a front view for explaining a surface treatment state of a steel sheet by the method of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a front view for explaining a surface treatment state of a steel sheet by a conventional method. (1) …… steel plate, (d) …… plate width, (2) …… centrifugal projection device, (3)
…… Abrasive material.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tadanori Miyamoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Shipyard (72) Inventor Koji Tamada 3-1, Honohara, Toyokawa City, Aichi Prefecture Shinto Kogyo Co., Ltd. Toyokawa Works (72) Inventor, Kunrou Ota 3-1, Honohara, Toyokawa City, Aichi Prefecture Shinto Kogyo Co., Ltd., Toyokawa Works (72) Inventor, Rokutada, etc. Toyokawa Mfg. Co., Ltd. (56) References JP 59-175955 (JP, A) JP 58-2795 (JP, B2) JP 56-32288 (JP, Y2)

Claims (1)

[Claims] 1. A method for surface treatment of a steel sheet, wherein a plurality of centrifugal projection devices are used to project the abrasive material onto a moving steel plate to remove scales on the surface of the steel plate. The polishing and cleaning material is such that the projection direction of the material is directed to the moving direction of the steel sheet, and each of the polishing and cleaning materials is projected to a plurality of narrow projection areas with a small width in the width direction of the steel sheet and collides with and reflects on the surface of the steel sheet. The method for surface treatment of a steel sheet is characterized in that the projection is performed at a projection angle having an acute angle with respect to the width direction of the steel sheet so as not to interfere with the abrasive cleaning material projected subsequently.