JPH02232169A - Centrifugal projection type blast processing method - Google Patents

Abstract

PURPOSE:To form a workpiece in its processed in uniform roughness while setting a projection distance to almost a fixed value for the workpiece by projecting a blast grinding material from a rotor to a curved surface of a workpiece with the predetermined width while moving it at a fixed speed and successively performing its surface treatment. CONSTITUTION:A conveyer 2 generates almost equal a projection angle and distance of a blast grinding material projected from a projection port of the blast grinding material in a rotor 1, and a workpiece W is mounted and fixed onto a curved surface 2a of the conveyer 2. Under this condition, the blast grinding material is projected to a surface of the workpiece W from the projection port in the rotor 1 while moving the conveyer 2 at a fixed speed. In this way, the processed surface of the workpiece W can be formed in uniform roughness.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method of blasting the surface of, for example, a pressure conductive rubber sheet, and more specifically, the present invention relates to a method of blasting the surface of a pressure conductive rubber sheet, etc. The present invention relates to a centrifugal blasting method that can uniformly apply blasting to the entire surface of a workpiece and make the roughness of the treated surface of the workpiece uniform.

[Prior art]

BACKGROUND ART Conventionally, as a method for treating the surface of a sheet-like workpiece such as pressure-sensitive conductive rubber, a blasting method has been used in which blast abrasive material is projected onto the surface of the workpiece. This blasting method includes an air pressure projection method and a centrifugal force projection method, and this method also uses grit with edges made of iron powder, spherical syjift, or silica sand as a material. The blasting material is projected onto the surface of the workpiece at a constant projection speed (.m). Projection density (kg/n{)
, projection distance (cll), and other conditions, this method is performed by sequentially projecting onto the workpiece.

[Problem that the invention seeks to solve]

By the way, as shown in FIGS. 3 and 4, in the conventional centrifugal projection type blast processing apparatus, a workpiece placed on a conveyance device 2 such as a workpiece feed conveyor is placed on a rotary drive rotor 1. Since the surface treatment surface Wa of the object W was placed on a flat surface, the projection angle (α) and projection distance C1> of the blast abrasive material to be projected differ depending on the position of the workpiece W having a predetermined width.

That is, as shown in Fig. 4, since the amount of wear S caused by the blast abrasive material differs, the roughness of the treated surface was uneven between the center and both sides. In addition, when the workpiece W is placed on a flat surface, the range that can be ground at a projection angle of 90°, which provides good projection efficiency, is very narrow, and therefore, there is a problem in that the work efficiency is extremely poor. [Purpose of the Invention] This invention was devised by focusing on such conventional problems, and by making the projection distance to the workpiece substantially constant, the roughness of the processed surface of the workpiece can be made uniform. The object of the present invention is to provide a centrifugal projection blasting method that can significantly improve the blasting efficiency.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a conveying device that curves the workpiece so that the distance from the blast abrasive material projection port of the rotor to each projection point on the surface of the workpiece is approximately the same distance. The blast abrasive material is projected from a rotor onto the surface of the curved workpiece having a predetermined width, and the workpiece is sequentially surface-treated while moving at a constant speed. This is a summary.

[Action of the invention]

This invention is configured as described above, and a workpiece is placed on a curved surface of a conveying device in which the projection angle and projection distance of the blast abrasive material projected from the blast abrasive material projection port of the rotor are approximately equal. In this state, the conveying device is moved at a constant speed, and blast abrasive material is projected onto the surface of the workpiece from the projection port of the rotor, thereby uniformizing the roughness of the processed surface of the workpiece. It is possible to
Furthermore, projection efficiency can be significantly improved.

[Embodiments of the invention] Examples of the invention will be described below based on the attached drawings. In the following explanation, the same components as those of the conventional example explained in FIGS. 3 and 4 will be described with the same reference numerals. FIG. 1 shows a schematic configuration diagram of a centrifugal blasting type blast processing apparatus embodying the present invention, where I is a rotary drive rotor;
Reference numeral 2 denotes a conveyance device such as a workpiece conveyor, and a pressure-sensitive conductive rubber formed in a predetermined width is attached to the support surface 2a of the conveyance device 2 via a mounting member (not shown) such as double-sided tape. A sheet-shaped workpiece W such as the above is placed.

The conveyance device 2 is formed in a curved manner so that the projection angle (α) and the projection distance #(f) of the blast abrasive material projected from the projection port of the rotor 1 are approximately equal. A workpiece W is placed on the support surface 2a, and a blast abrasive material is projected onto the surface Wa of the workpiece W to perform surface treatment. In addition to the above-mentioned embodiments, as a means for fixing the workpiece wt-* to the support surface 2a of the transport device 2, for example, as shown in FIG. , connect this vacuum chamber 4 to the vacuum bomb 5,
When the workpiece W is placed on the support surface 2a, the workpiece W may be fixed by suction using a vacuum.

Further, in the embodiments of the present invention, pressure-sensitive conductive rubber was used as the workpiece W, but the blasting method of the present invention is not limited to this, and the blasting method of the present invention can also be used when surface-treating a thin metal plate or the like. It is also possible to implement.

This invention is configured as described above, and the curved surface of the conveying device 2 makes the projection angle (α) and projection distance (2) of the blast abrasive material projected from the blast abrasive material projection port of the rotor 1 substantially equal. The workpiece W is placed and fixed on the support surface 2a having a diameter of 100.degree. By projecting, the roughness of the treated surface of the workpiece W can be made uniform, and the projection efficiency can be significantly improved.

[Effects of the Invention] As described above, the present invention curves the workpiece so that the distance from the blast abrasive material projection port of the rotor to each projection point on the surface of the workpiece is approximately the same distance. placed on the supporting surface of the conveying device, and projecting blast abrasive material from a rotor onto the surface of the curved workpiece having a predetermined width,
Since the surface treatment of the workpiece is performed sequentially while moving at a constant speed, the roughness of the treated surface of the workpiece W can be made uniform, and the projection angle of the entire projection range of the workpiece W is approximately perpendicular. Therefore, the projection efficiency can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a centrifugal blasting type blast processing apparatus embodying the present invention, Fig. 2 is a sectional view showing another embodiment in which a workpiece is fixed to a support surface of a conveyance device, and Fig. 3 and FIG. 4 are explanatory diagrams of a conventional centrifugal projection type blast processing apparatus. l... Rotor, 2... Conveyance device, 2a... Support surface, W... Workpiece, Wa... Surface of workpiece, α.
...Projection angle! ...Projection distance.

Claims (1)

[Claims] In a centrifugal projection blasting method in which blast processing is performed by projecting blast abrasive material onto the surface of a workpiece having a predetermined width from a rotationally driven rotor, the blast abrasive material is ejected from the blast abrasive material projection port of the rotor to the surface of the workpiece having a predetermined width. The workpiece is placed on the support surface of the curved conveyance device so that the distances to each projection point are approximately the same, and the surface of the curved workpiece having a predetermined width is blast-grinded from the rotor. A centrifugal projection blasting method characterized by projecting material and sequentially performing surface treatment on a workpiece while moving at a constant speed.