Gravity casting process

Abstract

The invention relates to a gravity casting process for manufacturing an all-in-one rack of a compressor. The gravity casting process is characterized in that firstly, an upper cylinder head and the inner wall face of a housing of the compressor are simultaneously processed and cast, so that the coaxiality between the upper cylinder head and the housing is guaranteed, and noise and vibration of the compressor are reduced; secondly, the inventor creatively discovers that the gravity casting mode can enable the combination parts of the upper cylinder head and the housing which are made of two different metal materials to be fused to form a mutual fusion zone, the purpose of metallurgical bonding can be achieved after cooling, and favorable mechanical bonding property is achieved; and thirdly, the gravity casting process further comprises incomplete annealing heat treatment, so that the casting stress of the two combination parts of the all-in-one rack can be eliminated, the mechanical performance is better, and the formed all-in-one rack can be further machined.

Description

technical field [0001] The invention belongs to the field of metal casting, and in particular relates to a gravity casting process applied to manufacturing an integrated frame of a compressor. Background technique [0002] With the development of the air conditioner market, customers are paying more and more attention to noise. Therefore, in the development of the compressor, it is necessary to further discuss the noise and vibration problems generated during the operation of the compressor in order to reduce its impact on the overall performance of the compressor. Impact. [0003] The traditional rotor compressor frame is mainly produced by welding the upper cylinder head and the compressor shell through three-point or six-point welding, but this production process cannot fully guarantee the coaxiality of the upper cylinder head and the shell (generally due to processing The reason for the accuracy is the coaxiality difference of 0.38mm), which inevitably causes eccentrici...

AI Technical Summary

Problems solved by technology

If the coaxiality between the upper cylinder head and the shell cannot be guaranteed, the air gap between the stator and the rotor will be uneven, and it will easily cause noise problems at high speeds

In addition, because the traditional stator is put into the shell through the shrink fit process, there is a stress of about 150MPa between the shell and the stator after the shrink fit

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