Method for manufacturing special sliders for rotary compressors by adopting 9Cr18 or 9Cr18Mo stainless steel

Abstract

The invention relates to a method for manufacturing special sliders for rotary compressors by adopting 9Cr18 or 9Cr18Mo stainless steel, which is characterized by comprising the following steps of selection of proper profile materials, blanking, rough machining, vacuum hardening and tempering, fine machining, rolled polishing, cleaning, liquid tufftriding salt bath treatment, rolled polishing, thickness and width superfine machining and cleaning to form finished products. In the whole process, three different machining modes of rough machining, fine machining and superfine machining are adopted, and the steps of vacuum hardening and tempering and liquid tufftriding salt bath treatment are respectively carried out in the three machining modes. The method has the advantages that as the special sliders for rotary compressors are manufactured by adopting martensite stainless steel 9Cr18 or 9Cr18Mo and the like and the martensite stainless steel has high content of Cr and good nitriding performance, the martensite stainless steel can be nitrided at lower temperature, thereby ensuring the less deformation of the sliders and being beneficial to precise machining after treatment.

Description

technical field [0001] The invention relates to a method for manufacturing a special sliding part for a rotary compressor, in particular to a method for manufacturing a special sliding part for a rotary compressor by using 9Cr18 or 9Cr18Mo stainless steel. Background technique [0002] At present, among the moving parts of the air-conditioning compressor, the most important wear-resistant special sliding part is the sliding vane (or vane) of the compressor. Among its six surfaces, five surfaces move relative to other important parts of the compressor. and slide. For traditional compressors that use R-22 or F134a as refrigerant, their vanes (or blades) are usually made of high-speed steel, and do not require special surface strengthening treatment, and their wear resistance and service life can meet the design requirements. However, as the requirements for environmental protection, energy saving and consumption reduction continue to increase, the mandatory use of low-fluorin...

AI Technical Summary

Problems solved by technology

At present, high-speed steel is used as special sliding parts. Since high-speed steel is subjected to conventional quenching and tempering methods, some austenite still cannot be transformed into quenched martensite, and they will gradually increase with time in future use. Transformation, resulting in changes in volume and size, although this size change is only a few microns, but it has a great impact on the high-speed moving compressor, and sometimes "stall" phenomenon occurs due to this, causing the air conditioner to fail to work and must be replaced compressor

For this reason, various compressor manufacturers have adopted various measures including cryogenic treatment to stabilize its size, which consumes huge energy and costs.

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