Injection Molding
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Cracking of PBT Injection-Molded Parts During Assembly
Fenómeno del problema
PBT products crack during assembly (press-fitting, screw tightening, etc.).
Análisis de la causa
The internal stress of the product is high, and the assembly stress superimposed exceeds the strength limit; the screw holes have no chamfer, causing stress concentration; the interference is too large.
Solución
Fully anneal the product to reduce internal stress; optimize the assembly design (chamfer, guide section, etc.); control the assembly stress.
Conclusión clave
PBT assembly cracking is an extension of stress management.
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