The shrinkage rate of Dongguan precision casting

The shrinkage rate of Dongguan precision casting is a very common problem. Different materials and casting methods have different shrinkage rates. The approximate shrinkage rate of the advance payment must be estimated before the production of abrasive tools.
1. The casting shrinkage rate refers to the reduction rate between the specific size of the casting and the size of the pattern due to the shrinkage of the line during the whole process of condensation and cooling of the casting.
The key to the size of the shrinkage rate of Dongguan precision casting is: aluminum alloy composition, casting structure, size, gathering of mold materials, refractory insulation materials for shell making, casting temperature of aluminum alloy liquid, etc. Casting shrinkage ε=(L-L1)/L1×100% where L is the size of the pattern. L1 is the casting size.
Second, the shrinkage rate is determined by the raw material, but the actual size of the parts will be different depending on the structure of the stainless steel casting. For example: a long triangular edge part as shown in the figure, if 1 side is wider than 2 sides, then this part can produce casting bending deformation under the condition of adopting corresponding measures, but it is not caused by the different shrinkage rate.
Yes, twenty commodities look like, generally for the same raw material, the shrinkage rate is the same. The actual accurate measurement and calculation of the shrinkage rate of Dongguan precision casting is also required by the national industry standard and can be searched.
3. Casting shrinkage rate, also known as casting line shrinkage rate, refers to the percentage of the size of each position becoming smaller during the whole process of condensing and closing the casting. It is closely related to the casting aluminum alloy type, composition, metal mold casting type, refrigeration standard and the structural characteristics of the casting itself. Casting shrinkage ratio=(final casting size-pattern size) / pattern size * 100%