Preparation method of powder-metallurgy refrigeration compressor valve sheet

Abstract

The invention relates to a preparation method of a powder-metallurgy refrigeration compressor valve sheet. The preparation method is characterized by comprising the following steps of: mixing iron powder, high-alloy main powder, graphite powder, manganese sulfide powder and zinc stearate powder according to certain proportion, leading the weight percentage of all elements in the total components to be as follows: 0.5-2.0% of carbon, 3.0-6.5% of cobalt, 2.5-4.5% of chromium, 2.5-4.5% of molybdenum, 0.5-2.0% of nickel, 0.2-1.0% of vanadium, less than 3% of impurities and the balance of iron; using a mold to press and form the mixture to obtain a powder-metallurgy green blank; putting the green blank in a sintering furnace to sinter for more than 5 minutes with the sintering temperature being 1150-1250 DEG C; carrying out repressing and finishing on the sintered blank; carrying out quenching and annealing under the protective atmosphere; and carrying out grinding on the valve sheet. In the preparation method, the problems of the adding mode and effective alloying of the powder-metallurgy high alloy are solved, and higher forming density needed by the powder-metallurgy valve sheet material under higher alloy content is realized, so that the powder-metallurgy refrigeration compressor valve sheet achieves the needed wear resistance. The prepared powder-metallurgy refrigeration compressor valve sheet has the advantages of low material cost, high material utilization ratio and suitability for large-batch production.

Description

Technical field [0001] The invention relates to a method for preparing a valve plate of a powder metallurgy refrigeration compressor, which is applied to the field of rotary air-conditioning refrigeration compressors. Background technique [0002] At present, in the refrigeration compressor industry, domestic rotary air-conditioning compressors are all made of ordinary high-speed steel material or stainless steel material through machining the valve. Compared with powder metallurgy compressor valve discs, the valve discs manufactured by ordinary high-speed steel material or stainless steel material have a slower processing speed and low material utilization rate, while the powder metallurgy process of compressor valve discs not only has high material utilization rate, but also It is suitable for mass production, but compressor manufacturers need to perform a small amount of fine grinding on the powder metallurgy valve discs before assembly and use. [0003] Compared with ordinary ...

AI Technical Summary

Problems solved by technology

Compared with the powder metallurgy compressor valve plate, the valve plate manufactured by ordinary high-speed steel or stainless steel is slower in processing speed and the material utilization rate is not high, while the powder metallurgy process manufactures the compressor valve plate, not only the material utilization rate is high, but also the material utilization rate is high. And it is suitable for mass production, but the compressor manufacturer needs to carry out a small amount of fine grinding on the powder metallurgy valve plate before assembly and use

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