different types of cnc machines.A brief discussion on the factors affecting the size of die casting parts

　　In the process of die casting production, especially some structural parts, there are very strict requirements for product size, so we must pay special attention in the production process, the following to talk about the factors that affect the size of die casting parts?

　　1. Dimensional error caused by molding shrinkage

　　Forming shrinkage is the main factor affecting the size of die casting, because the forming shrinkage is a complex process, so the calculation of shrinkage has a wide selection range, according to the external shape and structural characteristics of die casting, respectively select the size of each part of the appropriate molding shrinkage and determine the molding size, is to ensure the dimensional accuracy of die casting key issues.

　　2. Manufacturing errors of molded parts

　　① The influence of forming parts, mold processing datum and processing technology.

　　② Processing error of formed parts

　　③ Assembly error of molded parts

　　④ The error caused by the release slope of the molded part

　　3. The fluctuation influence of molding shrinkage during die casting

　　① Influence of die casting process parameters, such as injection ratio pressure and inner gate speed

　　The influence of mold temperature

　　③ Influence of die casting temperature during demoulding

　　4. Error caused by relative movement of structural parts

　　① Closing error

　　Movement error of side core pulling and movable core.

　　The error caused by the instability of the precision and process performance of the die-casting machine

　　5. Impact error

　　① Error caused by deformation caused by injection impact of molding parts

　　The error caused by the erosion of metal liquid or impurities on the surface of the formed part

　　③ Compression shot impact, so that the template goods forming parts produce elastic deformation or plastic deformation to form a molding error regardless of size

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