塑料注射成型工艺基础.ppt

1、塑料注射成型工艺基础,内容提要,注射工艺过程 注射压力 填充模式 浇注系统与流道平衡 冷却系统 应力、收缩与翘曲 常见的注塑缺陷 CAE软件应用指南,Co-injection molding,Fusible core injection molding,Gas-assisted injection molding,Injection-compression molding,Lamellar (microlayer) injection molding,Live-feed injection molding,Low-pressure injection molding,Push-pull inj

2、ection molding,Structural foam injection molding,Process cycle,Importance of process conditions,Resin data table,Temperature-time curve at various locations in the mold,Screw positions at various stages,Cycle time and its components,Required mold opening,Determination of the gate/part freezing time,

3、Pressure decreases along the delivery system and the cavity,Factors influencing injection pressure requirements (I),Factors influencing injection pressure requirements (II),Factors influencing injection pressure requirements (III),Factors influencing injection pressure requirements (IV),Injection pr

4、essure as a function,Melt front advancements,Melt-front velocity and melt-front area,Fiber orientations,Variation of MFA,Basic runner system layouts,Commonly used runner cross sections,Equivalent hydraulic diameters,Runner diameter chart,Effect of runner length,Hot runner system types,Filling patter

5、ns resulting from various injection rates,Cold slug,A family-mold part with artificially balanced runners,Gate size terminology,Gate types （I）,Direct (sprue) gate Tab gate Edge (standard) gate,Overlap gate Fan gate Disk (diaphragm) gate,Gate types （II）,Ring gate Spoke (spider) gate Film (flash) gate,Mold cooling accounts for more than two-thirds of the total cycle time,Proper and efficient cooling improves part