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Casting problem-Air pores

August 28, 2024
1.  Casting problem
Have air pores on surface
2. Casting photographs
Have air pores on surface
Have air pores on surface

3. Cast analysis
In this case, there are castings required for finishing, and the product structure is complex, and the four sides have sliders pulling the core. At present, the melted metal inlet of the side gate is blocked by the collision perforation, the metal flow filling deep cavity flow is insufficient, and the metal on both sides is too fast.
4. Improvement 
1. Extend the two sides of the runner to connect with the side slag bag, turn the overflow mouth into a gate, increase the filling amount of the deep cavity, and give priority to filling the deep cavity, so as to improve the effect. 
2. It is recommended to re-open the three-plate mold structure, the direct filling deep cavity machining surface, central casting can evenly split and shorten the filling distance, so it has an advantage over molding.
5. Tips
About Punch oil:
For castings with high porosity requirements, the amount of punch oil should be strictly controlled. If the punch is stuck, other related factors (pressure chamber deformation, punch wear and run, concentricity deviation, etc.) should be checked, and the amount of oil/particles in the punch should not be blindly increased. The amount of punch oil used can be roughly seen on the cake end face, the contact side of the cake and the press chamber
Cake punch usage comparison reference
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