Powder pressing mold and powder pressing method thereof

Abstract

The invention discloses a powder pressing mold and a powder pressing method thereof. The powder pressing mold comprises a mold cylinder, the mold cylinder is composed of an upper mold body, a lower mold and a peripheral sleeve, the inner diameter of the upper mold is equal to that of the lower mold, and the end face of the upper mold abuts against the end face of the lower mold; the upper mold is composed of two or more upper mold petals which can be separated in a radial direction. The peripheral sleeve is connected to the radial outer side of the upper mold in a sleeved mode, an upper pressing rod is arranged above the upper mold and can move in the upper mold and the lower mold under the action of external applied force, a circular truncated cone used for sealing the bottom of the lower mold is arranged in a bottom port of the lower mold, and a lower push rod is arranged below the circular truncated cone. The lower push rod and the circular truncated cone can move in the lower mold under the action of the external applied force. In the mold taking process, the upper mold is taken out firstly, then a pressed blank is taken out, the pressed blank can be taken out from the mold cylinder only by moving the lower mold by a length distance, the situation that the surface smoothness of a pressed part is affected due to long-distance moving and taking-out is avoided, and the requirements for the opening height and the oil cylinder stroke of a molding press during mold taking can be effectively lowered.

Description

technical field [0001] The invention relates to a powder pressing die, in particular to a powder pressing die used for pressing rods or column parts and a powder pressing method thereof. Background technique [0002] Powder compression molding is an industrial technology that uses powder particles as raw materials, fills the powder particles in the cavity of the mold, presses them into the mold by applying pressure, and demoulds to produce various types of products. It is usually used in thermal processing. parts. [0003] In powder compaction operations, such as compacting rods or cylindrical parts, the existing compaction methods usually place the powder directly in a tubular mold for compaction. Since the initial compaction powder is loose, there is a large gap between the powder itself, so that the initial compaction needs to be compacted. The volume occupied by the blank is often several times higher than the volume occupied by the compacted compact after pressing, res...

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Problems solved by technology

[0005] The present invention solves the need for a mold cylinder and a push rod with a larger size and height in the existing pressing operation of rods or columnar parts to accommodate the filled powder and push out the compacted powder rod compact, which has a larger size The high mold cylinder and push rod also require the green compact located in the mold cylinder to be taken out after long-distance movement; in addition, the outer surface of the green compact will also collide with or adhere to the inner wall of the mold cylinder due to long-distance movement, and part of it will remain on the wall surface, and then Destroying the smoothness of the outer surface of the compact, and when the push rod just abuts against the bottom of the compact during mold taking, the maximum size requirement generated by the assembly between the push rod and the mold barrel will also bring about the purchase cost of molding machines and other equipment The problem of increasing the surface smoothness of the pressed part due to the long-distance movement and removal of the outer surface of the formed rod or columnar part after pressing can be better avoided, and it also reduces the maximum possible occurrence in the mold taking. Powder compaction mold of required height dimension at size demand point and powder compaction method thereof

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