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September 09, 2024
1.Casting information
name: unknown
requirements :surface requirements
casting process: 
Die Casting machine tonnage:400T
punch dia(mm):70
alloy material: ADC12
2.Casting problem
sink mark and casting crack on surface.see the defect position picture 
3.Casting picture
pic 1 front top viewCasting picture
4. casting analysis
The reason for the surface shrinkage mark and shrinkage crack is that the wall thickness of the isolated bar joint in the cavity is sharply reduced, There is a blind hole on the mold, which is unfavorable to the forming, and a higher filling speed is required to improve the mist effect of the gate in order to form. After high pressure and high speed filling, shrinkage marks and cracks are caused by solidification and contraction between isolated bars.
5.improving measures
①.The isolated rib root is chamfered into R Angle to avoid rapidly reduced wall thickness and improve the product surface shrinkage mark.
②.The flat ejector pins are arranged under the isolated ribs, and use flat ejector pins’ gap to exhaust ,which is in order to improve the forming condition and avoid the top crack caused by excessive solidification contraction and holding force.
6.Tips
For shrinkage mark
Shrinkage marks near the gate can be improved by trying to delay the solidification time of the gate (such as increasing the thickness of the gate).
 
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Mr. Logan

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