JPS62180761A - Manufacture of ball for treating powdered body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing a powder processing ball (hereinafter simply referred to as a ball).

Various types of powder treatment equipment are used to crush, mix, disperse, crush, and even dry objects.

This type of powder processing equipment □fills the object into a container,
The object is processed according to the purpose by applying rotation, vibration, etc. to the old tatami mat, but in general, a ball is loaded as a processing medium into the container to improve powder processing efficiency. □Punish for improvement.

By the way, in the recent era of high-level technological products, it is required to obtain high-purity materials using powder processing equipment.9 For example, in connection with the electronics field,
Semiconductors, piezoelectric elements, IC circuits, and the like are manufactured in large quantities, and many of these products use high-purity ceramic moldings. These high-purity ceramic molded products are generally made using finely pulverized high-purity ceramic powder, with additives added, mixed or dispersed, molded into the desired shape, and then fired. Certain high-purity ceramic powders must contain as little inorganic impurities as possible that are not removed by firing in the manufacturing stages of each product, in order to avoid adversely affecting the performance of each product due to its nature. is required.

On the other hand, when an object is processed by a powder processing apparatus, one of the main causes of inorganic impurities being mixed into the object is the balls used during powder processing.

This is because the balls are generally made of metal in relation to powder processing efficiency, but the balls collide violently with each other or between the balls and the container during powder processing. This is because the outer circumferential surface of the ball is subject to impact drop, wear, etc.

The present invention relates to a method for producing a ball that meets the recent demand that the processed material must be of high purity while taking into consideration powder processing efficiency, and in particular, a method for producing a ball whose core metal ball is coated with a synthetic resin. It is something.

<Prior art, its problems, etc.> Conventionally, a ball itself in which the outer peripheral surface of a metal ball is coated with synthetic resin has been proposed (Japanese Patent Publication No. 46-25226,
(Japanese Patent Publication No. 49-21401, Japanese Patent Publication No. 55-84547)
.

However, these conventional proposals do not disclose a method for manufacturing such a ball. What is important in manufacturing such balls is that the metal ball is positioned at the center of the ball as a whole, and that the ball can be manufactured efficiently, as well as the durability of the ball. If the metal ball, which has a decisive influence on the center of gravity of the ball, is not positioned at the center of the ball, the ball will become a so-called wasteful state during powder processing, and the powder processing will be difficult. Needless to say, this will have an adverse effect on itself, and the durability of the ball will also be significantly reduced.

<Problems to be Solved by the Invention and Means for Solving the Problems> The present invention provides a method for efficiently manufacturing a ball in which a metal ball is positioned at the center and the outer peripheral surface of the metal ball is equally coated with synthetic resin. However, the present invention has the following features:
A synthetic resin receiver having legs integrally attached to the outer periphery of a hollow substantially semicircular sphere is prepared.1. The metal ball placed on the hemispherical piece by fixing the legs to the mold is positioned at the center of the mold, the inner circumference of which forms a spherical surface, and then heated into the clamping mold. The present invention relates to a method for manufacturing a powder processing ball, which comprises injecting a molten synthetic resin, followed by cooling and surface shaping.

Hereinafter, the configuration of the present invention will be explained in more detail based on the drawings. .

FIG. 1 is a longitudinal sectional view illustrating a receiver used in the present invention, and FIG. 2 is a front view thereof. The receiver 11 is made of synthetic resin and has one leg 13 hanging down at the center of the outer periphery of a hollow semicircular spherical piece 12. The leg 13 is divided into an upper part 14 and a lower part 15. 144,000 has a total of four strips 14a to 14d (strip 14d not shown) protruding along the leg 13.

FIG. 3 is a longitudinal sectional view illustrating a state in which the metal ball is positioned at the center of the mold and the synthetic resin is injected in the present invention. The mold 2 length is composed of an upper mold z2 and a lower mold 23,
The upper mold 22 has an injection hole 22a, and the lower mold 23 has a sink hole 2.
3a is provided in the center of each mold, and when both molds are closed, the inner periphery of the mold as a whole forms a spherical surface. When the upper mold 22 is opened, the recess of the lower mold 23 is formed. hole 2
3a to said receptor 11. The lower part 15 of the leg piece 13 hanging vertically is press-fitted to fix the leg piece 13 and thus the receiver 11. Any stage may be used before or after such fixation, but the half of the receptor 11, the circular spherical piece, 1? Metal ball 31Q
Leave Q. It is preferable that the semicircular sphere piece 12 is larger than half of the circular sphere and its inner diameter is slightly smaller than the diameter of the outer circumference of the metal sphere 31. In this case, the metal sphere 31 is Round spherical piece 12. It will fit into the hole and be placed. When the upper mold 31 is then closed, the metal ball 31 has a spherical inner circumference and is positioned at the center of the mold 21 forming the metal ball 31 . After closing the upper mold 31, the heated and melted synthetic resin 41 is injected into the mold 21 as prescribed, cooled, and the outer peripheral surface of the metal ball 31 held by the receiver 11 is directly coated with the synthetic resin 41. let In the drawing, mold 21
Although air venting, cooling, and injection equipment are omitted,
For example, these steps, including the application of a mold release agent, may be carried out in accordance with conventionally known injection molding methods.

FIG. 4 is a vertical sectional view illustrating a ball manufactured according to the present invention. After cooling as described above, the upper mold 2
When opening 1 and taking out the injection molded product, the injection molded product is
Since the area corresponding to the injection port 22a and the area corresponding to the joint between the upper die 22 and the lower die 23 are not smooth, and the lower part 15 of the leg piece 13 protrudes, the surface must be shaped with a stone or a cutter. do.

Thus, the metal ball 31 held by the receiver 13 (the lower part 15 of the leg 14 thereof has been removed) is centered, and the synthetic resin 41 (12,
14) coated balls are produced.

In the present invention, the synthetic resin forming the receiver and the synthetic resin covering the metal ball may be made of the same material or different materials, and there are no particular restrictions on these materials. In order to facilitate injection molding as desired and to ensure sufficient durability of the manufactured ball, 6-nylon is used as the synthetic resin that forms the receiver, and 6-nylon is used as the synthetic resin that covers the metal ball. 6- Nylon is preferable. In order to strengthen the adhesion with the synthetic resin covering the metal sphere, the surface of the metal sphere has been roughened by physical or chemical means, and the outer surface of the metal sphere has been roughened with multiple layers. It is preferable to have a small protrusion or, conversely, a plurality of small depressions on the outer circumferential surface.The material of the metal ball has a high processing efficiency when powder processing is performed using the manufactured ball. In order to improve the

<Example> A ball was manufactured under the following conditions according to the procedure shown in FIGS. 1 to 4 described above.

Receiver: ◆・Synthetic resin covering the 6-nylon metal ball (heat-melted and injected) No. 6, 6-nylon metal ball, 10 mm diameter lead ball, lightly sandblasted on the outer surface Diameter of the spherical surface forming the inner circumferential surface of the mold...24 Injection molding...Heat melting temperature of synthetic resin 265-285°C1 Injection pressure 50 Kg/cm2, Injection time 40 seconds, Cooling time 1
The upper mold was opened for 00 seconds, the injection molded product was taken out, and the surface was shaped using a cutter and sandpaper to produce a desired ball.

<Effects of the Invention> As explained above, the present invention has the effect of being able to efficiently manufacture a ball in which a metal ball is positioned at the center and whose outer peripheral surface is equally coated with synthetic resin. .

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view illustrating the receiver used in the present invention, in which a metal ball is positioned at the center of the mold and synthetic resin is injected, and FIG. 4 is a longitudinal sectional view illustrating the receiver used in the present invention. FIG.

Claims (1)

[Scope of Claims] 1. By preparing a synthetic resin receiver in which legs are integrally attached to the outer periphery of a hollow, substantially semicircular sphere, and fixing the legs to a mold, the semicircular sphere is A metal ball placed on one piece is positioned at the center of the mold whose inner periphery forms a spherical surface, and then heated and melted synthetic resin is injected into the mold, followed by cooling and surface shaping. A method of manufacturing a powder processing ball. 2. The method for manufacturing a powder processing ball according to claim 1, wherein the receiver is made of 6-nylon. 3. The method for producing a powder processing ball according to claim 1 or 2, wherein the heated and melted synthetic resin is 6,6-nylon. 4. A method for manufacturing a powder processing ball according to any one of claims 1 to 3, wherein the metal ball has been subjected to surface roughening treatment. 5. The method for manufacturing a powder processing ball according to any one of claims 1 to 4, wherein the metal ball is made of lead.