Method for casting upper bearing and lower bearing of compressor

Abstract

The invention discloses a method for manufacturing an upper bearing and a lower bearing of a compressor. The method comprises a step of forming a mixed sand core, wherein a metal core body is arranged in the mixed sand core, the mixed sand core is fixed in a sand mould cavity, and after being casted, the sand core falls off from the sand mould cavity to form a casting inner hole. The mixed sand core is structurally composed of the metal core body and a surface sand layer wrapping the outer portion of the metal core body. The method has the advantages of effectively eliminating shrinkage and shrinkage porosity of casting heat joint portions of the upper bearing and the lower bearing of the compressor, and enabling the casting quality to meet customer requirements.

Description

technical field [0001] The invention relates to the field of bearing manufacture, in particular to a method for manufacturing an upper bearing and a lower bearing of a compressor. Background technique [0002] The casting of the existing compressor ductile iron upper and lower bearings is produced with vertical lines. Such as figure 1 As shown, the casting body 2 of the upper bearing and the lower bearing uses a sand core at the center position, and the sand core needs to be lowered during the production process. Core setting methods include manual core setting and core setting machine automatic core setting. The castings of the ductile iron upper bearing and lower bearing of the compressor produced by the vertical line without sand cores have large shrinkage cavities or shrinkage defects at the hot joint part 3, and the defect rate reaches 30%-70%, resulting in compressor failure. The upper bearing and the lower bearing of the ductile iron will be scrapped and cannot mee...

AI Technical Summary

Problems solved by technology

The castings of the ductile iron upper bearing and lower bearing of the compressor produced by the vertical line without sand cores have large shrinkage cavities or shrinkage defects at the hot joint part 3, and the defect rate reaches 30%-70%, resulting in compressor failure. The upper and lower bearings of the ductile iron will be scrapped and cannot meet the requirements of use

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