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Method for casting ductile iron casting of air-conditioning compressor

A technology for air-conditioning compressors and ductile iron, which is applied to casting molding equipment, casting molds, and casting mold components. The effect of slag defects

Active Publication Date: 2012-12-19
上海华新合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The design wall thickness of the ductile iron body of the air conditioner compressor is 20mm at the thinnest point, and nearly 70mm at the thickest part. The wall thickness is extremely uneven, which causes great difficulties for the solidification and feeding of the ductile iron

Method used

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  • Method for casting ductile iron casting of air-conditioning compressor
  • Method for casting ductile iron casting of air-conditioning compressor
  • Method for casting ductile iron casting of air-conditioning compressor

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Embodiment 1

[0035] see Figure 1 to Figure 6 , the casting method of air conditioner compressor ductile iron body casting of the present invention, comprises the steps:

[0036] 1) Sand mixing, molding and core making

[0037] Air-conditioning and air-conditioning compressor ductile iron body castings use an automatic sand mixer to mix furan resin self-setting sand and then shape and manufacture the first to eighth sand cores 1 to 8.

[0038] Before molding, place 11 kinds of cold iron 9 (91~911) on the lower mold plate as required, and put sand for molding, place heat preservation riser 10 and exhaust piece 11 at the specified position of the upper mold, and then carry out sand filling, compaction, lifting Modeling, repairing, and brushing paint and drying the surface; then manufacturing the first to eighth sand cores 1 to 8, brushing paint and drying the surface and placing them for later use, among which the first sand core 1 and the second sand core are manufactured When the sand co...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/24C22C37/04C22C33/08
Inventor 徐清
Owner 上海华新合金有限公司
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