SU99959A1 - The method of forming products from powder mass - Google Patents

Description

The known methods of forming articles from powder mass in molds using compressed air and vacuum do not ensure uniform and high-quality pressing of all parts of the product.

The described method allows to eliminate this drawback. This is achieved by the fact that the powder mass in the mold is placed in a rubber cylinder and is subjected to hydraulic pressing with water injected between the wall of the mold and the rubber cylinder.

FIG. 1, 2, and 3 show a pioneering process for preparing a glass-shaped product (graphite crucible) according to the method according to the invention.

At first, a rubber cylinder 2 is installed inside the mold 1, which is fixed in the upper part of the mold with a nut 3 and a pressure ring 4. The lower part of the cylinder 2 is clamped between the disk 5 and the ring 6.

Before the molding starts, the valve 7 opens onto the mold

A sealing cap 6 is put on. Through which compressed air at a pressure of 2-3 atm is fed through the hose 9 to the rubber seal 10. And through the hose 11 enters the mold.

The compressed air that has come inside the mold straightens the rubber bottle 2 and presses it tightly against the walls of the mold. After air is released through the valve from the space between the outer surface of the cylinder 2 and the walls of the mold, the creeper 7 is closed, the sealing flap 8 is removed, and the core 13 is lowered onto the cone 12 and then a double hopper 14 with an iron cylinder 15 is installed. A moldable mass of powder and a powdery powder coating are poured inside the mold. In this case, the moldable mass enters the space inside the cylinder 15, and the protective coating fits into the space between the cylinder 15 and the rubber cylinder 2.

After filling the mass into the mold, the hopper with the cylinder is removed and the mass is leveled. Then, the upper disc 16 is put on the hessform and the lid 8 is closed. Through the hose 9, compressed air is supplied to the rubber seal 10 and a vacuum pump is turned on, which, however, removes air from the hose to the hose. After the air is drawn from the inner part of the mold into the space between the rubber cylinder 2 and the walls of the mold, water is pressurized under the pressure of the pipe 17, which hydraulically presses the powder mass. Due to the uniform pressure of water on the rubber cylinder, the same mass density is ensured in all parts of the product.

After hydraulic pressing, the vacuum pump is turned off and the water is discharged through the pipe 17. To separate the cylinder 2 from the pressed product and to displace water from the nressform, compressed air is blown into the hose // to inflate the rubber container and press it to the walls of the nress form. Then release the air from the cylinder, remove the cover 8 and remove the core 13 together with the extruded product from the mold.

Subject invention

Claims (3)

1. A method of forming articles from a powder mass in molds using compressed air and vacuum, in that the powder mass in the mold is placed into a rubber balloon and is subjected to hydraulic pressing with water produced between the wall of the mold and the rubber balloon to compress the product. 2. A method for performing the method according to claim 1, characterized in that the expansion of the rubber balloon on the inner surface of the mold is And | Removing the balloon from the pressed product is done with compressed air. 3. Acceptance of the method according to claim I, characterized in that, in order to ensure uniform and dense pressing of the product, the pressed mass, poured into a balloon, is preliminarily subjected to vacuum. Fig FIG. 2 /