JPS61234923A - Lustering method for side band part of compression molded article - Google Patents

Abstract

PURPOSE:To produce inexpensively a compression molded article such as a tablet and the electronic parts having no scuff marks even without using a lubricant by rotating a mortar to luster a side band part of the molded article in case of compressing and molding the raw material powder with an upper pestle and a lower pestle. CONSTITUTION:The raw material powder 6 is packed in a mortar 4 which is inserted freely turnably into plural bushes 7 provided to a peripheral edge part of a rotating disk 1 and the compression molding is performed with an upper pestle 2 and a lower pestle 3. The mortar is held freely turnably with a flange part 10 and a mortar gear 8 rotating by the rotation of the rotating disk is meshed with an internal gear 9 and thereby the mortar is rotated in an inside periphery so as to rotate on own axis. A molded article which has no flaw such as a streak and has the smooth luster is obtained by performing the rotation of the mortar until the molded article is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for polishing side bands of compression molded products such as pharmaceutical tablets, electronic parts, confectionery, catalysts, and ceramics.

(Prior art) Generally, when manufacturing molded products such as tablets by compressing raw material powder (including granules), a large number of dies are installed on the outer periphery of a rotary disk. After filling the mortar hole with the powder and compressing it with the upper and lower punches,
Manufactured using a rotary powder compression molding machine that extrudes the molded product using a lower punch.

However, in most cases, this compression molded product becomes a ready-to-use product, but when the compressed molded product in the mortar hole is pushed out with the lower punch, it is rubbed against the wall of the mortar hole, Scratches, or vertical lines, occur on the side bands of compression molded products that come into contact with the wall of the mortar hole, lowering their commercial value and, in the case of electronic parts and ceramics, causing a complete loss of marketability.

Conventionally, therefore, a lubricant is mixed into the raw material powder to reduce scratches that occur on the side bands.

(Problems to be Solved by the Invention) In such conventional technology, a lubricant is always required due to its structure, and the lubricant may not be able to be used due to the nature of the compression molded product to be manufactured. .

For example, if the molded product is ferrite or ceramics, it will be fired after molding, but due to the nature of the product, it is not possible to mix lubricants into the raw material powder. be.

Furthermore, even when lubricants are used, it is extremely difficult to completely eliminate scratches that occur on the side bands.
There is a problem in that it is necessary to produce compression molded products with high commercial value that always have smooth and glossy side bands without using a lubricant.

(Means for Solving the Problems) In order to solve these problems, according to the present invention, powder is filled into the holes of a large number of mortars arranged on a rotary disk, and the upper and lower punches In a rotary powder compression molding machine that compresses the powder, a mortar and a rotary disk are rotatably arranged, and when the powder is compression molded using an upper punch and a lower punch, the molded product is formed by rotating the mortar. Provided is a method for polishing a side band of a compression molded product, characterized in that the side band of the compression molded product is made glossy.

In the above configuration, the rotation of the mortar begins before compression molding the powder and until the molded product is discharged from the mortar hole.

It can be done.

(effect) The above technical means works as follows.

When the powder filled in the mortar hole is compressed by the upper and lower punches to form a molded product, the side band portion of the molded product that comes into contact with the wall that is the inner peripheral wall of the mortar rotates. As a result, the wall portion acts as if polishing the side band portion, and the side band portion has a smooth luster.

Further, the rotation of the mortar is continued until the molded product is ejected from the mortar hole, thereby preventing scratches such as vertical lines and maintaining a smooth gloss until the molded product is taken out.

(Example) An example of this invention will be described with reference to the drawings.
is a rotary disk, and a large number of bushes (7) are arranged at equal intervals around the periphery of the rotary disk (1), and a mortar (2) rotatably fitted into the bushes (7). 4), an upper punch (2) and a lower punch (3) facing each other are arranged to be vertically slidable.

The mortar (4) inserted into the bush (7) has a flange αφ, and this flange α is connected to the lower end of the bush (7) and the U-shaped washer α.
It is rotatably held by a lever, and a mortar gear (8) is formed at its lower end.

(9) is an internal gear that meshes with the mortar gear (8), and the internal gear (9) is connected to the rotary disk +1.
) is in mesh with the mortar gear (8) which rotates due to the rotation of the rotor (4), so that the mortar (4) rotates around the inner periphery of the bush (7) as if it were rotating on its own axis.

(6) is a molded product formed by compressing raw material powder filled into the mortar hole of the mortar (4) with an upper punch (2) and a lower punch (3). A(2)
is the side band part of the molded product (6), and the side band part (to) contacts the side wall (5) which is the inner periphery of the mortar (4), and the side wall is rotated by the rotation of the mortar (4). (5) is the side band part (2
) becomes smooth and shiny by contacting it as if polishing it.

(2) is the fitting groove that locks one end of the U-shaped washer aυ, α荀 is the lower roll that determines the height of the lower punch (3), (5) is the upper punch key, and αe is the lower punch key. .

(Effects of the Invention) As explained above, according to the present invention, when compression molding the raw material powder with the upper and lower punches, by rotating the mortar, a smooth surface is formed on the side band of the molded product. It can produce gloss and there is no need to mix a lubricant into the powder, so it can be easily and reliably applied even to molded products where a lubricant cannot be used due to the nature of the molded product.

Therefore, it is possible to provide compression-molded products with high commercial value that are free from scratches and the like at low cost and in a simple manner.

[Brief explanation of drawings]

The drawings show an embodiment of the method of polishing the side band portion of a compression molded product according to the present invention, and FIG. 1 is a longitudinal sectional view of the main part. In the drawing, +11 is the rotary disk, (2) is the upper punch, (3)
is the lower pestle, (4) is the mortar, (5) is the side wall, (6) is the molded product,
(7) is the bush, (8) is the mill gear, (9) is the internal gear - 1α field is the flange, Ql) is the U-shaped washer, (2) is the fitting groove, α rumor is the side band, α~ indicates the lower roll, α ri indicates the upper punch key, and α sho indicates the lower pestle key.

Claims (1)

[Scope of Claims] 1. In a rotary powder compression molding machine that fills powder into the holes of a large number of dies arranged on a rotary disk and compresses the powder with an upper punch and a lower punch, the mortars are placed on a rotary disk. A compression-molded product characterized in that the die is rotatably disposed in the upper and lower punches, and when the powder is compression-molded using the upper and lower punches, the side bands of the molded product are made to shine by rotating the mortar. How to polish the side bands. 2. Polishing of the side band portion of a compression-molded product according to claim 1, wherein the rotation of the mortar is performed from before the powder is compression-molded until the molded product is ejected from the mortar hole. Method.