Method for detecting overall quality of air hole and shrinkage cavity flaw of aluminum alloy die pressed casting

Abstract

The invention discloses a method for detecting the overall quality of an air hole and shrinkage cavity flaw of an aluminum alloy die pressed casting. The method comprises the following steps that 1, the die pressed casting to be detected is heated, and then naturally cooled to room temperature; 2, the swelling condition of the surface of the die pressed casting is observed, if swelling is observed, detection is finished, and if swelling is not observed, the next step of shrinkage cavity detection is carried out; 3, the die pressed casting which does not swell in the last step is sliced, the slicing density is measured firstly, the slices are heated, the slicing density is measured again after the slices are naturally cooled to room temperature, the slicing density before and after heatingis set as X and Y, the density unit is g / cm<3>, the quality of the die pressed casting is judged according to the slicing density values before and after heating, if Y is smaller than or equal to X, Xis larger than 2.72 and smaller than 2.74, and Y is larger than 2.72 and smaller than 2.74, the quality of the die pressed casting is high, and if Y is smaller than or equal to X, X is larger than 2.70 and smaller than 2.74, and Y is larger than 2.70 and smaller than 2.72, the die pressed casting is qualified; if the slicing density values before and after heating are not within the condition I and the condition II, the die pressed casting is unqualified.

Description

technical field [0001] The invention relates to a method for detecting the overall quality of air holes and shrinkage cavity defects of aluminum alloy die-casting parts, which is especially suitable for aluminum alloy die-casting parts in automobile air-conditioning compressors, and belongs to the technical field of aluminum alloy die-casting. Background technique [0002] In the automobile air-conditioning compressor, the compressor shell, front and rear covers, cylinder block and other components are all aluminum alloy die-casting parts. High temperature, uneven wall thickness of die castings and other reasons will cause pores and shrinkage cavities in die castings. Therefore, after production, the die casting needs to be tested. The detection method in the prior art is to use X-ray flaw detection. The X-ray flaw detection machine used in this detection method is expensive and requires high skills for operators. Moreover, the X-rays generated during the detection process ...

AI Technical Summary

Problems solved by technology

Therefore, after production, die castings need to be inspected. The detection method in the prior art is to use X-ray flaw detection. The X-ray flaw detector used in this detection method is expensive and requires high skills for operators.

Moreover, the X-rays generated during the detection process of the flaw detector not only have side effects or even some damage to the human body, but also cause radiation pollution to the environment.

In addition, in the prior art, there is still a cutting inspection of castings, and the porosity of die castings can be judged by observing the porosity of the cutting surface of die castings, but this detection method is not accurate based on the observation of artificial naked eyes.

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