Method for casting ductile iron casting of air-conditioning compressor

Abstract

A method for casting a ductile iron casting of an air-conditioning compressor comprises the following steps of: sand mixing, moulding, core manufacturing, mold assembling, furnace charge melting, tapping spheroidization and inoculation treatment, casting, cooling, unpacking, casting cleaning and product quality inspection. A unilateral flange dispersed casting technology is adopted in process design, and external chill is disposed on several thicker positions of the casting. The casting needs to satisfy the following mechanical properties: the tensile strength is larger than or equal to 450MPa, the yield strength is larger than or equal to 310MPa, the elongation percentage is larger than or equal to 10% and the hardness is within 160-210HBS. There exist no casting defects within products.

Description

technical field

[0001] The invention relates to a casting method, in particular to a casting method of a ductile iron body casting of an air-conditioning compressor used in the air-conditioning industry. Background technique

[0002] The ductile iron body of the air conditioner compressor is a key component of the air conditioner compressor. This component provides storage space for high-pressure air and works under higher temperature and higher pressure, so it requires a dense organizational structure and strong pressure resistance Heat resistance. Some well-known compressor manufacturers in the world often use FC250 grades for compressor body materials, and Gree air conditioners use ductile iron QT450-10 grades for the body material to better ensure the pressure resistance of the parts. In addition, the body itself has a complex structure, The uneven wall thickness puts high demands on the casting process of the casting. The mechanical properties of castings should meet ...

Images