KR20120008168A - Cylinder shaped abradant for pretreatment - Google Patents

Abstract

PURPOSE: A column-shaped abrasive material for pretreatment is provided to extend a using period for filter of a dust collector and a blasting machine, because diameter of an abrasive is limited so that a surface of a work piece is precisely ground and dust generation due to the abrasive material is diminished. CONSTITUTION: A column-shaped abrasive material for pretreatment is a column-shaped having diameter 0.6~0.8mm. The abrasive material is formed with a cut wire having diameter 0.6~0.8mm, so that a consumption of paint for a coating film of a metal panel(20) is diminished.

Description

Cylindrical shaped abradant for pretreatment

The present invention relates to a cylindrical columnar abrasive for pretreatment, and to a cylindrical columnar abrasive for pretreatment for improving the appearance quality (roughness) by forming an abrasive used in the pretreatment process of a major steel pipe of construction equipment in a cylindrical shape.

In general, the shot blast is a fine size on the surface of the product in order to remove casting sand or scale appearing on the surface of the product formed by casting, forging, rolling, etc., or to remove foreign substances on the surface of the product. It refers to a machine that sprays an abrasive having a shot and polishes or processes the surface by the impact.

According to the method of spraying the abrasive, it is roughly divided into an air type shot blast for injecting the abrasive using compressed air and a centrifugal shot blast for injecting the abrasive by centrifugal force.

When the centrifugal shot blast is described among the above shot blasts, a polishing chamber is provided inside, a main body having a ball inlet hole penetrating into the polishing chamber in the circumferential wall, and fixedly fixed to the body inlet hole, and the abrasive material inside the polishing chamber. Both end portions are provided with an injector equipped with an impeller rotated by a motor so as to strongly inject, an abrasive supply cylinder installed above the main body to supply the abrasive to the injector, and an abrasive stored in the abrasive supply cylinder to the injector by its own weight. A feed valve connected to the outlet of the supply container and the inlet of the injector, respectively, and a supply valve installed at the end of the outlet of the abrasive supply container or the feed pipe connected to the outlet side to supply or block the supply of abrasive to the injector; do.

If the impeller is rotated at the same time the valve is opened while the workpiece is inserted into the main body, the impeller will strongly strike the abrasive to project the surface of the workpiece, thereby processing the surface of the workpiece.

Conventionally used abrasives consist of a spherical shape with a diameter of about 1 mm, and these spherical abrasives have a high dust generation rate as the circulation cycle increases when pretreatment of main pipes of construction equipment by the continuous circulation method. A phenomenon in which the surface treatment rate is lowered has occurred.

The present invention is to solve the above problems, the object is to form the shape of the cylindrical material for pretreatment of the pre-treatment of the major steel pipes of construction equipment, to improve the surface treatment rate, can be provided with excellent surface roughness pretreatment It is to provide a cylindrical columnar abrasive.

Another object of the present invention is to reduce the amount of use compared to spherical abrasives in the blasting operation by the continuous circulation method, and to reduce the dust generation rate to extend the dust collector filter replacement cycle of the blasting apparatus for cylindrical columnar abrasives for pretreatment To provide.

The present invention is an abrasive for pretreatment;

The abrasive is formed in a cylindrical columnar shape and has a diameter of 0.6 to 0.8 mm.

As described above, the present invention may form the abrasive in a cylindrical columnar shape, limit the diameter, and precisely polish the surface of the workpiece, thereby decreasing the pretreatment failure rate and improving the pretreatment process speed.

In addition, the present invention can improve the appearance quality by improving the surface roughness of the coating, can reduce the paint consumption, reduce the amount of dust generated by the abrasive, and has many effects such as to extend the life of the dust collector filter and blasting apparatus.

1 is an illustration showing a configuration according to the present invention;
Figure 2 is an exemplary view showing a surface treatment and coating application state by the present invention and conventional abrasives

1 shows an exemplary view showing a configuration according to the present invention, the present invention in the abrasive for pretreatment of a metal panel; The abrasive 10 is formed in a cylindrical columnar shape and has a diameter d of 0.6 to 0.8 mm.

That is, the abrasive 10 is made of a cut wire type in which a wire having a diameter of 0.6 to 0.8 mm and preferably a diameter of 0.65 mm is cut at regular intervals to form a cylindrical columnar shape. At this time, it is preferable that the said abrasive has a length of 0.5-1.0 mm.

When the abrasive is less than 0.6 mm in diameter, it may adversely affect the durability of the abrasive and increase the dust generation rate. When the abrasive is more than 0.8 mm, the surface treatment rate, the dust generation rate and the surface roughness are lower than those of the conventional abrasive, so that the appropriate range Must be set within.

In addition, since the cylindrical columnar abrasive of the present invention made as described above is deformed into a spherical shape as it is reused as it is reused by a continuous circulation method, it has a function of a spherical abrasive even when recycled.

Hereinafter, the present invention will be described in detail by way of examples.

Example 1

On the surface of the metal panel, a spherical abrasive with a diameter of 1.0 mm, a cylindrical cylindrical abrasive with a diameter of 0.95 mm, and a cylindrical cylindrical abrasive with a diameter of 0.65 mm were projected at a projection speed of 64 kPa, and the surface treatment was performed by a continuous circulation method. The work load (surface treatment rate; Sa2.5 standard) was measured. The results are shown in [Table 1] below.

Table 1

As shown in [Table 1], when looking at the conventional spherical abrasives as a reference, in the case of cylindrical cylindrical abrasives having a diameter of 0.95 mm, it can be seen that the surface treatment rate decreases as the projection amount increases. Rather, it can be seen that the surface treatment rate is lowered.

In addition, in the case of a cylindrical columnar abrasive having a diameter of 0.65 mm, it can be seen that there is a large difference from the beginning when compared with the spherical abrasive from the beginning.

As such, the surface treatment rate means the processing speed of the work, and it can be seen that the cylindrical columnar abrasive according to the present invention has an excellent processing speed compared to the spherical abrasive.

In addition, it can be seen that the surface roughness Rz at this time is also superior to the cylindrical columnar abrasive having a diameter of 0.95 mm and the cylindrical columnar abrasive having a diameter of 0.65 mm.

Example 2

The metal panel was surface-treated in the same manner as in Example 1, and the dust generation rate for the recovered abrasive was measured. At this time, the projection amount was limited to 10kg / min, and measured by setting the particle size 0.3mm or less to dust, the results are shown in Table 2 below.

[Table 2]

As shown in [Table 2], in the case of cylindrical columnar abrasives having a diameter of 0.95 mm, the dust generation amount is increased rather than the conventional spherical abrasives, whereas in the case of a cylindrical columnar abrasive having a diameter of 0.65 mm, it is more remarkable than the spherical abrasives. It can be seen that the degradation. In other words, it can be seen that the abrasive according to the present invention has excellent durability.

Example 3

The surface treatment of the metal panel was carried out by the same method as in Example 1, and the surface roughness of the metal panel was measured. The results are shown in [Table 3] below.

[Table 3]

As shown in [Table 3], the cylindrical cylindrical abrasive of 0.95 mm in diameter was rougher than the conventional spherical abrasive, whereas the cylindrical cylindrical abrasive of 0.65 mm in diameter was finer than the spherical abrasive. It can be seen.

Example 4

A coating film 30 having a thickness of 90 μm was formed on the metal panel 20 treated as in Example 3 (projection speed 70 m / s), and the amount of paint consumption was calculated. The result is shown in FIG.

Figure 2 shows an exemplary view showing the surface treatment and paint coating state according to the present invention and the conventional abrasive, (a) is the abrasive of the present invention (cylindrical cylindrical abrasive of diameter 0.65mm), (b) is 1.0mm in diameter Shows the surface treatment and the coating film shape by the spherical abrasive.

As shown in FIG. 2, the paint consumption of the metal panel surface-treated with the abrasive of the present invention and the conventional spherical abrasive is the same in the area of the A portion, but it can be seen that a significant difference occurs in the area of the B portion. At this time, T in Fig. 2 is the coating film thickness, R means roughness.

That is, when calculating and contrasting the paint consumption according to FIG. 2, the area A of part (a) and (b) is the same as the film height 90 × 1 × 1, while the area B is about 60.2 × 1. In the case of (b), the roughness is 77.8 × 1 × 0.5 × 1, whereas when calculating the total paint consumption (A + B), (a) is 120.1 and (b) is 128.9. It can be seen that the paint consumption of the metal panel surface-treated by the invention abrasive is reduced by about 7%.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

(10): cylindrical columnar abrasive (20): metal panel
30: coating film

Claims (2)

In the abrasive for pretreatment of a metal panel;
The abrasive is cylindrical cylindrical abrasive for pre-treatment, characterized in that the cylindrical columnar shape of 0.6 ~ 0.8mm diameter.
The method of claim 1,
The abrasive is a cylindrical columnar abrasive for pretreatment, characterized in that formed by cutting a wire having a diameter of 0.6 ~ 0.8mm.

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