How is the shrinkage rate of Dongguan precision casting controlled?

The shrinkage rate of Dongguan precision casting is a widespread problem. Different materials and casting methods have different shrinkage rates. Before producing and manufacturing the mold, the advance payment needs to be calculated.

1. Casting shrinkage refers to the shrinkage rate between the actual size of the casting and the model size during the solidification and cooling process of the casting, resulting in the shrinkage rate between the actual size of the casting and the model size.

The key dimensions of Dongguan precision casting shrinkage are: aluminum alloy composition, casting structure, size, mold closure, shell refractory insulation materials, aluminum alloy liquid casting temperature, etc. Casting shrinkage ε=(L-L1)\/L1100 where L is the model Size.L1 is the casting size.
2. The shrinkage rate is determined by the raw material, but the shrinkage size of the specific part may be different, which is determined by the appearance structure of the stainless steel casting. For example, as shown in the figure, if the total width of 1 side of the long 3-corner edge part and 2 side width, the part will not produce casting bending deformation when selecting corresponding measures, but not due to different shrinkage rates

For the appearance of 20 products, generally speaking, for the same raw material, the shrinkage rate is the same. Industry standards also stipulate specific precision measurements and calculations for Dongguan precision casting, which can be searched.

3. Casting shrinkage, also known as casting line shrinkage, refers to the shrinkage percentage of each part of the casting during the entire solidification and closing process. It is related to the aluminum alloy type, composition, metal casting type, cooling specifications and the structure of the casting itself The properties are closely related. Casting shrinkage=(casting Z rear size - pattern size) \/ pattern size 100