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Method for solving shrinkage porosity of investment casting aluminum alloy casting

A technology of aluminum alloy castings and investment casting, which is applied in casting molding equipment, casting molds, casting mold components, etc., can solve problems such as shrinkage porosity of castings, and achieve the effect of eliminating shrinkage porosity defects.

Inactive Publication Date: 2020-04-07
SHAANXI HONGYUAN AVIATION FORGING
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Problems solved by technology

[0003] The purpose of the present invention: to provide a method for solving the shrinkage porosity of investment casting aluminum alloy castings, so as to solve the problem of shrinkage porosity in thicker and large parts of aluminum alloy castings produced by investment casting method

Method used

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  • Method for solving shrinkage porosity of investment casting aluminum alloy casting
  • Method for solving shrinkage porosity of investment casting aluminum alloy casting
  • Method for solving shrinkage porosity of investment casting aluminum alloy casting

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Embodiment

[0044] The present invention is further described in detail below by specific embodiment:

[0045] The ZL116 material bearing casting used by a certain type of aircraft, the outline size is 333 × 192 × 98 (mm), the type II casting. This casting adopts investment casting method, vacuum smelting and vacuum casting, the combined process see figure 1 , the production pass rate is 45%, the defects are mainly X-ray inspection shrinkage, see the shrinkage position figure 2 . In order to solve the problem of shrinkage porosity of castings, high-pressure drying air is used to force cooling the shrinkage porosity of castings. For this purpose, a special blowing device for the support is made, which can blow air at the shrinkage porosity at the same time.

[0046] A 25Kg vacuum induction furnace is used for smelting and casting, and the cooling rack and blowing device are placed in appropriate positions in advance, and then smelting and casting are carried out. First, put the preheat...

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Abstract

The invention belongs to the field of investment casting, and particularly relates to a method for solving shrinkage porosity of an investment casting aluminum alloy casting. The method comprises thefollowing steps: casting a casting by adopting an investment casting method; and carrying out air cooling on the thick and large part of the casting. According to the method, high-pressure dry air isadopted for locally and forcibly cooling the casting set, and the defect of casting shrinkage porosity of thick and large parts can be effectively overcome.

Description

technical field [0001] The invention belongs to the field of investment casting, and particularly relates to a method for solving shrinkage porosity of an aluminum alloy casting in investment casting. Background technique [0002] An aluminum alloy casting is produced by investment casting method. After the casting is poured, due to the poor heat dissipation performance of the mold shell, the heat is not easily dissipated. At the same time, the aluminum alloy is in a paste-like solidification mode, which leads to the large wall thickness of the casting and the parts that cannot be fed through the gating system. The low pass rate of radiographic inspection directly affects product delivery. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a method for solving the shrinkage porosity of investment casting aluminum alloy castings, so as to solve the problem of shrinkage porosity in thick and large parts of the aluminum alloy castings produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D27/04
CPCB22C9/04B22D27/04
Inventor 关军玲王荣周雷刘俊英
Owner SHAANXI HONGYUAN AVIATION FORGING
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