Molds & Tooling
8 visualizaciones
COC Thick-walled Optical Part Long Molding Cycle
Fenómeno del problema
The cooling time of COC thick-walled optical parts is as long as several minutes, the productivity is low, and shortening the cooling causes shrinkage deformation and internal stress cracks.
Análisis de la causa
Thick-walled amorphous materials conduct heat slowly, and the core heat takes time to dissipate; early ejection causes the core to continue shrinking and deforming; the high mold temperature process further prolongs the time to reach demolding stiffness.
Solución
①Optimize the cooling water channels close to the thick-walled area; ②adopt variable mold temperature technology, high mold temperature during filling and rapid cooling during cooling; ③hollow out and thin the structure; ④evaluate annealing to replace part of in-mold cooling.
Conclusión clave
The cycle contradiction of COC thick-walled parts is resolved by variable mold temperature and structural design; the cost of blindly shortening cooling is deformation and cracking; cycle optimization should first calculate the heat balance.
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!