JP2678821B2 - Thin plate blasting surface treatment method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blasting surface treatment method performed to improve adhesion when a thin plate material is coated, coated, sprayed, or the like.

(Prior art and problems) In recent years, along with technological trends of lightness, thinness, shortness, high functionality, and high quality, there is an increasing demand for blasting undercoating of high-grade materials (SUS, Cu, Al alloys, etc.) at the thin plate stage. However, such high-grade materials are very thin due to the high quality, and in some cases 0.
It has a thickness of 3 mm or less. For this reason, the surface roughness of the surface treatment is required to be in the order of micron, and a shot material having a fine particle size is used. However, when the particle size of the shot material becomes fine, the number of particles per unit weight becomes small. Very many,
If the conventional blast treatment method is carried out as it is, collision may occur between the reflecting projection material and the projected projection material, or the projection material accumulated on the surface of the thin plate material may not be removed completely, There is a problem that the flow of the shot material is generated on the surface of the plate material and collides with the projected shot material to deteriorate the blast efficiency.

Further, the thin plate material has a problem that the normal blasting method causes a distortion in the thin plate material, and the situation is that the blasting base treatment of the thin plate material of 0.3 mm or less is not carried out.

(Object) The present invention has been made in view of the above problems, and is a method suitable for blasting a thin plate material without lowering the blasting effect or causing distortion in the thin plate material. It is intended to provide.

(Means for Solving Problems) In order to achieve the above object, the blasting surface treatment method for a thin plate material according to the present invention is carried out by supporting a thin plate material of 0.3 mm or less in a vertically standing state and at the same time in the vertical state. While horizontally moving the thin plate material in the lateral extension line direction, project a grit-shaped projection material of 0.1 to 0.5 mm with a collision angle of 50 to 75 degrees from the rear direction to the front direction of the thin plate material with respect to the thin plate material. Speed 15 ~
The feature is that they are made to collide with both vertical surfaces at a speed of 75 m / sec at the same time.

(Operation) By adopting the blasting surface treatment method for a thin plate material as described above, it is possible to efficiently perform the blasting surface treatment while preventing the occurrence of distortion of the thin plate material while eliminating the collision, interference and the like of the projection materials.

(Progress of Invention) The inventor has noticed that there are many demands for surface roughness (irregularities) of about 15 μm or less as a condition for the surface treatment of a thin plate material. We considered changing the particle size of the shot material according to the demand for roughness. However, it has been found that this solution is difficult to change into various kinds, especially in the case of a fine particle projection material, from the mechanical structure of a practical machine and other aspects.

Therefore, various tests were repeated to determine whether the rough surface (irregularities) can be controlled by changing the other projection conditions while keeping the particle size of the shot material constant, and the results are summarized in FIG.

That is, the graph of FIG. 1 shows a case where a grit-like (effective as a base treatment) projection material having a particle size of 0.1 to 0.5 mm is projected onto a stainless steel plate material at a collision angle of 50 degrees and a projection speed of 15 to 20 m / sec. A line showing the surface roughness (A), collision angle 75 degrees,
Lines showing the surface roughness when projected at a projection speed of 75 m / sec are shown in (B), respectively.

From the results of this test, the thin plate material to be blasted with the grit-like shot material with a fine particle size is achieved by using the grit-like shot material with a particle size of 0.3 mm or less to make the uneven surface of 15 μm or less, which is often required. It was found that the surface roughness can be controlled by changing the collision angle or the projection speed even if the particle size of the shot material is the same.

Furthermore, the inventor considers that the collision angle of the projection material with respect to the thin plate material is 90 degrees or less in order to prevent the projection material reflected after projection from colliding with the projected projection material. The relationship between the amount and the angle of collision with the thin plate material was investigated in FIG.

According to this result, the impact angle of the shot material on the thin plate is set to 75
It was found that the blasting materials do not interfere with each other even if the blasting is performed in a state where the projection rate of 600 kg / min, which is a capability that does not hinder the general blasting machine, is secured by setting the temperature to less than or equal to the degree. However, it was also found in the surface roughness check that it is desirable to set the collision lower limit angle of the projectile material to about 50 degrees in order to stabilize the degree of surface roughness of the thin plate material. (A shaded area in FIG. 2) Furthermore, in order to prevent the shot material from being deposited on the thin plate material or causing the flow of the shot material, the thin plate material is supported in a vertically standing state, and this is supported. While moving horizontally in the direction of the horizontal extension line of the thin plate, the optimum conditions for the blasting surface treatment obtained from the above test results, that is, the particle size of the shot material is 0.3 mm or less, and The present invention has been completed by setting the collision angle in the range of 50 to 75 degrees and further projecting the projection material onto both the front and back surfaces of the thin plate material in order to prevent distortion of the thin plate material.

(Effect) As is clear from the above description, according to the present invention, if the projection collision angle is limited by using a fine projection material while supporting the thin plate material in a vertically standing state and moving it horizontally, Since the projection collision is made on both the front and back sides at the same time, it is possible to efficiently perform the blasting base treatment using a general practical blasting machine, and at the same time, there are various effects such as the occurrence of distortion of the thin plate material can be prevented.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship with the surface roughness of the thin plate material when the blasting treatment is performed by changing the particle size of the blast material and the blasting conditions, and FIG. 2 is the collision angle of the blast material with the thin plate material, and the It is a graph which shows the relationship of the amount of projections (range which the projection materials do not interfere).

Claims (1)

(57) [Claims] 1. A thin plate having a thickness of 0.3 mm or less is vertically supported and supported, and the thin plate in a vertical state is horizontally moved in a lateral extension direction, while the thin plate is rearward with respect to the traveling direction of the thin plate. From the front to 0.1 with a collision angle of 50-75 degrees
A blasting surface treatment method for thin plate materials, characterized in that a grit-like shot material of ~ 0.5 mm is made to collide with both vertical surfaces at a speed of 15 ~ 75 m / sec.