Molds & Tooling
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PC Product Stress Cracking
Fenómeno do problema
The product develops cracks during assembly, contact with solvents, or after being left for a period of time, mostly starting from sharp corners, screw bosses, and weld lines, it is a delayed failure.
Análise das causas
PC is extremely sensitive to residual internal stress; high internal stress caused by high holding pressure, uneven cooling, and large demolding ejection force induces environmental stress cracking under the action of solvents, grease, or external force; stress is the internal cause and the medium is the external cause, and neither can be absent.
Solução
①Reduce holding pressure and cool uniformly to reduce residual stress from the source; ②Optimize ejection to avoid ejection whitening stress; ③Structurally eliminate sharp corners and avoid excessive assembly interference; ④Avoid contact with incompatible solvents; ⑤Anneal stress-sensitive parts.
Conclusão principal
The core of PC management is 'internal stress management': cracking is often a time bomb that explodes after leaving the factory; restraining the holding pressure and eliminating uneven cooling is far more effective than screening cracked parts afterwards.
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