aluminium profile supplier.Work with a rigorous attitude to prevent the occurrence of a large number of defective products

　　Sand holes are small holes that appear on the surface or inside of a casting. Based on the location of the sand holes, we can determine whether they are surface sand holes or internal sand holes. Surface sand holes can be identified by the naked eye, while internal sand holes need to be detected by instruments to determine. The formation of sand holes is caused by the expansion of the sand mold or sand core, unreasonable pouring system, or improper operation. The design of the mold is also related to the formation of sand holes, which is similar to the reasons for other defects. Before and during the box closing process, if the floating sand in the mold cavity is not cleaned thoroughly, the falling of sand particles will have an impact. Based on the cause of sand hole formation, we can adopt the method of low-temperature pouring for casting, and also clean the mold cavity in a timely manner to keep it clean. Before pouring, cover the gate cup to prevent foreign objects from falling into the mold cavity through the gate. When transferring the sand box, avoid collision and prevent sand particles from falling.

　　In order to improve the quality of castings, Shenzhen Zinc Alloy Die Casting Factory must follow the correct operating procedures to make die castings, and follow the correct procedures during the production process to avoid the occurrence of defective die castings.

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