Powder progressively-increasing pressing device and method

Abstract

The invention discloses a powder progressively-increasing pressing device and method and belongs to the technical fields of material processing and mechanical equipment. The powder progressively-increasing pressing device comprises an upper die punch, upper die punch hydraulic rods, a front female die, a rear female die, female die hydraulic rods, a lower die punch, a stripper plate, a stripper plate hydraulic rod, a female die hydraulic rod servo motor, an upper die punch hydraulic rod servo motor and a stripper plate hydraulic rod servo motor. The powder progressively-increasing pressing mode prevails over a one-time pressing mode in two aspects, namely the bottom end compactness and the mean compactness, furthermore, a pressed blank is uniform in density, and final performance of a product is improved; by means of the powder progressively-increasing pressing device and method, electric control and automation control are achieved, production efficiency is improved, and production cost is lowered; intensity of manual work is lowered, and safety is improved; and in addition, a high-power mode and a low-power mode are provided, so that energy consumption is lowered, and efficiency is improved.

Description

technical field [0001] The invention relates to a powder incremental pressing device and a pressing method, belonging to the technical field of material processing and mechanical equipment. Background technique [0002] Forming is a basic powder metallurgy process second only to sintering in importance, and it limits and determines the entire production process of powder metallurgy more than other processes. Whether the forming method is reasonable or not directly determines whether the entire production process can be carried out smoothly; it affects the subsequent processes and the quality of the final product; it affects the automation, productivity and production cost of production. [0003] During powder compaction, the porosity of the compacted powder body decreases, and the relative density of the green compact is significantly higher than that of the powder body, but as the axial pressure is applied to the powder body, it behaves like a fluid to some extent, The app...

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Problems solved by technology

Whether the forming method is reasonable or not directly determines whether the entire production process can go smoothly; it affects the subsequent processes and the quality of the final product; it affects the automation, productivity and production cost of production

[0003] During powder compaction, the porosity of the compacted powder body decreases, and the relative density of the green compact is significantly higher than that of the powder body, but as the axial pressure is applied to the powder body, it behaves like a fluid to some extent, Apply force to the die wall of the female mold, resulting in the generation of lateral pressure, and coupled with the friction between powder particles, the pressure transmission is uneven, resulting in uneven density in different parts of the green compact, which in turn affects the final performance of the product

[0004] In the prior art, one-time pressing molding process is often used, and the green compacts formed by one-time pressing will have the problem of uneven green density, that is, the problem of bottom density and average density is particularly prominent. In addition, the current Most of the equipment has low production efficiency and serious energy consumption

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