Powder metallurgical warm compacting device

Abstract

The invention relates to a powder metallurgical warm compacting device which comprises a base, a supporting frame, a driving device, a punching device, a digital hydraulic control system and a vacuumexhaust system, wherein the punching device comprises a lower punch, a pressing die and an upper punch; the driving device is fixed on the base; the lower punch and the pressing die are arranged abovethe driving device; the lower punch faces a cavity of the pressing die; the supporting frame is arranged above the driving device; the upper punch is fixed at the top end of the supporting frame, andfaces the pressing die; the pressing die is driven by the driving device to move up and down; the digital hydraulic control system controls and displays the moving parameters of the driving device and the heating temperature of an electromagnetic heater; and the vacuum exhaust system comprises a vacuum pump and a vacuum exhaust pressing die. The powder metallurgical warm compacting device realizes accurate temperature control of a pressed compact, and improves the pressed compact pressing performance; and by application of the digital hydraulic control system, the accurate regulation of the pressing speed and the pressing pressure is realized, and temperature control operations under different pressing conditions are realized.

Description

technical field [0001] The invention belongs to metallurgical technology equipment, in particular to a kind of equipment for powder metallurgy warm pressing forming. Background technique [0002] With the rapid development of powder metallurgy technology, powder metallurgy products are widely used in machinery, automobiles, aerospace and other fields. In the powder metallurgy production process, powder compaction has a great influence on the final quality of the compact. Metal powder warm compression forming technology is an applied new technology developed in recent years, and is now considered to be the most important technological progress in the production technology of powder metallurgy parts. [0003] Compared with the traditional cold pressing, the powder warm pressing technology can achieve relatively high compaction density under lower compaction pressure, and can significantly improve the strength of the material and reduce the internal pressure of the compact. e...

AI Technical Summary

Problems solved by technology

Studies have shown that based on the cost of single pressing / sintering traditional powder metallurgy process of 1.0, the cost of warm pressing process is only 20% higher, and the cost of other production processes such as powder forging is 2.0, and the cost of copper infiltration process 1.4, repress / refire cost 1.5

[0004] Due to the fact that the metal powder is discontinuous during the pressing process of the current warm pressing machine, using the warm pressing device of the prior art to press, at the initial stage of pressing, the particles are filled with gas, which is very easy to be squeezed by the punch. The formation of local strong gas pressure, resulting in the risk of cracks in the compact part in subsequent processing

In addition, because the pressed green body is in direct contact with the air, the metal powder is easily oxidized and rusted at a preset relatively high temperature, which affects the performance of the product

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