Investment Casting Defects
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Investment casting is a common metal forming process that can create metal parts of various shapes with high precision, high consistency and high reliability. However, during the investment casting process, defects can also occur that can affect the quality and performance of the final product. Investment casting defects can refer to the following:
One of the common defects is air holes. Pores refer to the holes formed inside the investment mold because the gas on the surface of the investment mold cannot escape in time during the investment casting process. The existence of pores will affect the quality and performance of the product, because the pores will reduce the strength and density of the product, and at the same time increase the instability of parameters such as air tightness and thermal expansion coefficient of the product.
Another defect is inclusions. Inclusions refer to a solid substance formed during the investment casting process as impurities or defects in the investment material are melted and mixed together at high temperatures. The existence of inclusions will affect the quality and performance of the product, because the inclusions will reduce the strength and toughness of the product, and at the same time increase the thermal expansion coefficient and the instability of the mechanical properties of the product.
In addition to the above two defects, investment casting may also have other defects, such as shrinkage cavity, shrinkage porosity and deformation. Shrinkage cavity refers to the hole formed inside the casting because the shrinkage cavity inside the casting cannot escape in time during the investment casting process. The existence of shrinkage cavity will affect the quality and performance of the product, because the shrinkage cavity will lead to a decrease in the strength and density of the product, and will also increase the thermal expansion coefficient and the instability of the mechanical properties of the product.
Shrinkage porosity refers to the loose holes formed inside the casting due to the inconsistency between the thermal expansion coefficient of the investment material and the casting during the investment casting process. The existence of shrinkage porosity will affect the quality and performance of the product, because shrinkage porosity will lead to a decrease in the strength and density of the product, and will also increase the thermal expansion coefficient and the instability of the mechanical properties of the product.
Deformation refers to the deformation formed inside the casting due to the inconsistency between the thermal expansion coefficient of the investment material and the casting during the investment casting process. The existence of deformation will affect the quality and performance of the product, because the deformation will cause the strength and density of the product to decrease, and will also increase the thermal expansion coefficient and the instability of the mechanical properties of the product.
In conclusion, various defects can occur during the investment casting process, which can affect the quality and performance of the product. In the investment casting process, effective measures need to be taken to reduce the occurrence of these defects to ensure the quality and performance of the product.