Production technology of air-conditioning compressor crankshaft

Abstract

A production technology of an air-conditioning compressor crankshaft comprises the following steps of: sand mulling; modeling; melting and interrupted front treatment; casting; casting cleaning and product quality inspection. During the modeling design process, the axial direction of a die crank is perpendicular to a parting face and parting of the die crank is carried out at the eccentric part of the crankshaft. After modeling and stripping, crankshaft cavities are formed and are respectively arranged inside two adjacent sand molds. During the casting process by a bottom casting mode, a filter screen is used to filter molten iron. On the basis of meeting technological requirements of crankshaft casting, production efficiency is raised and the purpose of energy saving and emission reduction is achieved.

Description

technical field [0001] The invention relates to the field of casting, in particular to a production process for an air conditioner compressor crankshaft. Background technique [0002] The crankshaft is a key component of the rotary air conditioner compressor, so it has high performance requirements, and ductile iron is generally used. The material grade of this product is QT550-6, and its mechanical properties must meet the requirements of tensile strength ≥ 550Mpa, elongation ≥ 6%, hardness HRC 86-99; metallographic structure requires spheroidization rate ≥ 80%, graphite size 5-7, The pearlite content is 20-70%, and the carbide is ≤1%. Any casting defects are not allowed in each part of the crankshaft. [0003] The general production process of crankshaft is as follows: Figure 1a , Figure 1b As shown, it is produced on a vertical extrusion molding line, the crankshaft mold 1a is parallel to the parting surface 2a along the axial direction, and the crankshaft cavity 3a i...

AI Technical Summary

Problems solved by technology

[0005] The vertical extrusion molding line requires that the pattern plate occupancy rate (the ratio of the area occupied by the casting mold and the gating system on the pattern plate to the area of ​​the pattern plate) is less than 60%. The area occupied by the plate is relatively large, so the number of single-type production crankshafts is small, and the yield is low, generally between 45% and 55%. The fluctuation is large, which affects the stability of product quality; the weight of single-type molten iron is small, the sand iron is relatively large, the waste of molding sand is more, and the production efficiency is low

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