spiral duct fabrication.Production of Zinc Alloy Die Castings

　　1. Product surface contamination

　　Zinc alloy die castings not only need to ensure surface cleanliness before heat treatment, but also cannot be contaminated during the production process. If oil stains and corrosion occur in zinc alloy die castings before heat treatment, it will affect the effective adsorption of carbon during the treatment process. During the pre oxidation process, more oil fumes will be generated, which not only adhere to the surface of the product, hinder carburization, but also affect the stability of the furnace atmosphere.

　　2. The influence of temperature

　　The non-uniformity of temperature inside the furnace has a significant impact on zinc alloy die castings, and various unexpected situations during the production process can affect the uniformity of furnace temperature.

　　Insufficient cooling

　　The cooling performance and cleanliness of quenching oil can affect the quenching quality. The failure of the agitator and improper oil filling method can affect quenching and cooling, resulting in uneven hardness of zinc alloy die castings.

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