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Casting problem--cold shut on ends

September 15, 2024
1.Casting problem
cold shut on ends
3.Casting picture
Casting picture
3.casting analysis
This case is casting with one mold multi-cavities
1.As the main runner section surface is smaller than cross runner section surface. the pressured metal flow will cause pressure loss during transfer process. it's possible to cause air entrainment.
2.gete location is too narrow.
4. Improvement measures
1. Increase the cross-sectional area of the main runner to 1.1-1.2 times of the cross runner.
2, increase the gate cross-sectional area to reduce the gate filling speed, weaken the gate mist forming effect, improve the shooting distance.
3, adjust to the partial pre-filling process, you can obtain the full wall thickness sequential filling effect, so as to achieve the purpose of improvement.
PIC 4 current problem diagram
5. Tips
About filling:
For long stroke filling, filling time and exhaust are critical: filling time is too long, and cold material increases; Poor exhaust will intensify the mixing of cold material and air, making the surface and internal quality of the end or enrolling position unqualified.
 
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