Manufacturing method of rotary type compressor crankshaft blank

Abstract

The invention provides a manufacturing method of a rotary type compressor crankshaft blank and belongs to the technical field of liquid variable capacity machinery, aiming at solving the problem thatan existing crankshaft blank is easy to bend and deform in a cold heading molding process. The manufacturing method of the rotary type compressor crankshaft blank is carried out according to the following steps: first step, selecting materials and blanking; selecting a round steel rod with the diameter which is greater than that of a long shaft part and smaller than that of an eccentric crankshaftpart; second step, coldly extruding and molding the long shaft part, wherein a transition part is provided with the long shaft part and a cylindrical part connected with one end of the long shaft part; and third step, coldly extruding and molding the eccentric crankshaft part and a short shaft part, and applying axial pressure to the transition part to enable the cylindrical part in the transition part to be deformed, fully fill an eccentric crankshaft molding cavity and enable residual materials to flow into a short shaft molding cavity. In a production process of the rotary type compressorcrankshaft blank, the eccentric crankshaft part and the short shaft part are nearly subjected to an axial bearing force in a molding process, so that the rotary type compressor crankshaft blank is noteasy to bend and deform.

Description

technical field [0001] The invention belongs to the technical field of liquid displacement machines, and relates to a rotary compressor, in particular to a method for manufacturing a crankshaft blank of a rotary compressor. Background technique [0002] The motor of the rotary compressor does not need to convert the rotary motion of the rotor into the reciprocating motion of the piston, but directly drives the rotary piston to rotate to complete the compression of the refrigerant vapor. Rotary compressors are more suitable for small air conditioners, especially for household air conditioners. [0003] The crankshaft is one of the core components of the rotary compressor. There are many related literatures on the manufacturing method of the crankshaft, such as the manufacturing method of the crankshaft of the hermetic reciprocating compressor (publication number CN1470772A). Brazed together. A method for preparing a ductile iron crankshaft of an air conditioner compressor (...

AI Technical Summary

Problems solved by technology

[0006] The existing conventional nodular cast iron crankshaft can no longer meet the technical requirements

The crankshaft manufactured by cold heading method has the problems that the crankshaft is easy to bend and deform during the cold heading forming process. In other words, there are problems such as low qualified rate of finished products and serious waste of materials.

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