Rolling piston and manufacturing method thereof for rotary type cold compressor

Abstract

A rolling piston for a rotary refrigerating compressor and a manufacturing method thereof, wherein the rolling piston material is a precision steel pipe after cold rolling of GCr15 bearing steel, and the manufacturing method comprises the following steps: (1) selecting GCr15 bearing steel for cold rolling to conform to the rolling piston Steel pipes with required precision for inner diameter, outer diameter and thickness; (2) cutting steel pipes according to the length of the rolling piston material; (3) heat-treating the cut steel pipes with controllable gas; (4) coarsely grinding each surface of steel pipes; Chemically treated steel pipes; (6) Fine grinding all surfaces of steel pipes. The invention has the advantages that: the manufactured rolling piston has obvious advantages in wear resistance and high contact fatigue life. The cutting workload can be reduced by 50%, and the steel utilization rate can reach more than 90%, thus reducing the manufacturing cost. It also saves the casting method, avoids pollution to the environment and high energy consumption, and is a good method for energy saving and environmental protection.

Description

technical field [0001] The present invention relates to a rotary refrigeration compressor part and its manufacturing method. Background technique [0002] Rotary refrigeration compressor, also known as rolling rotor compressor, uses piston rotation to compress refrigerant gas. It has been on the market for more than 20 years, and it is one of the most commonly used compressors at present. [0003] The rolling piston is an important part of the rotary refrigeration compressor sleeve. It is set on the eccentric turn of the eccentric shaft of the compressor. It rolls along the cylinder wall during refrigeration. Contact, forming a dynamic seal, with the use of new environmentally friendly refrigerants, high efficiency, and energy saving in rotary compressors becoming more and more diversified, a more advanced proposal is made for rolling pistons that can be applied to severe conditions such as high load, high power, high temperature, and high pressure. high demands. [0004] ...

AI Technical Summary

Problems solved by technology

Rolling pistons are generally manufactured by die casting or continuous casting tubular methods. The tube body is cast first, then the material is cut, and then the inner hole, outer circle turning, peeling and grinding are carried out. Therefore, the cast tube body needs to leave more The amount, the utilization rate of piston material is only about 60%, the manufacturing process is complicated, and the manufacturing cost is high; also because the rolling piston is manufactured by casting method, a large amount of "three wastes" will be generated in the casting process, which seriously affects the environment and causes pollution, and the working environment is relatively poor. Poor, also affects the health of operators

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