abs injection molding cost.Understanding and Understanding of Shrinkage and Porosity in Zinc Alloy Die Castings

　　Shrinkage and porosity are common die-casting defects in the manufacturing of zinc alloy die-casting parts by die-casting plants. Shrinkage and porosity account for a large proportion of the scrap rate in die-casting parts, and extra attention should be paid.

　　Shrinkage porosity is formed during the solidification and cooling of die castings without the addition of molten metal. It is similar in appearance to pores, so it is easy to confuse. It has the characteristics of large volume and concentration, and its distribution area is much larger than that of shrinkage porosity. Shrinkage refers to the small and dispersed pores formed in the top area of a die casting during solidification due to the lack of replenishment of molten metal. Improper appearance and structure can lead to shrinkage and porosity. When designing the pattern, it is important to ensure consistent thickness of the cross-section and avoid unreasonable situations. Improper gate design is also one of the factors contributing to the formation of numerous casting defects. Improper gate design, such as a small cross-section, can accelerate cooling. If the cross-section of the casting is too thick, shrinkage holes may form due to poor filling and shrinkage. Sometimes, in order to reduce costs, improperly sized sand boxes are used. Improper sand boxes can lead to the solidification of the metal liquid before it is replenished.

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