Piston for rotary compressor and manufacturing method of piston
A technology of a rotary compressor and a manufacturing method, which is applied in the direction of rotary piston/oscillating piston pump components, manufacturing tools, mechanical equipment, etc., and can solve problems such as high cost and large pollution
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Embodiment 1
[0018] The piston is made of 20CrMnTi material, which is cold-extruded to form a piston base blank. After rough machining, it is subjected to heat stabilization treatment at 580°C for three times in an unprotected air furnace. After finishing, it is gas nitrided at a temperature of 550°C for 8 Hours, the gas is ammonia and carbon dioxide. After finishing, it reaches the use precision, forms a 30 um diffusion layer, and the surface hardness HV is greater than 450, which fully meets the use requirements.
Embodiment 2
[0020] The piston is made of 42CrMo material, and the piston base blank is formed by warm extrusion. After rough machining, heat stabilization treatment at 650°C is performed twice in a vacuum furnace, and ion nitriding is carried out after finishing machining. The temperature is 560°C and the time is 10 hours. , the gas introduced is ammonia and carbon dioxide. After finishing, it reaches the use precision, forms a 30 um diffusion layer, and the surface hardness HV is greater than 450, which fully meets the use requirements.
Embodiment 3
[0022] The piston is made of 38CrMoAi material, which is cold-rolled into a precision steel pipe and cut according to the size of the piston. After rough machining, it is subjected to a thermal stabilization treatment at 800°C in an ammonia cracking atmosphere protection furnace. After finishing machining, it is subjected to liquid salt bath nitriding treatment. at 570°C for 4 hours, the ion concentration CNO - % is 36%, CN - % is 4%, CO 2 2- % is 19%, Na + % is 21%, K + % is 19%, Li + % is 1.2%, and the use precision is reached after finishing, forming a diffusion layer of 50 um, and the surface hardness HV is greater than 450, which fully meets the use requirements.
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