GE注塑成型介绍讲述.ppt

Thermoplastics and Degradation 热塑性塑料和降解 Degradation 降解 T e m p e r a t u r e Time 时间 Injection Molding Process Barrel Unit The Reciprocating Screw (Filling) Throat Heating Coils Nozzle Hopper Screw Barrel Force, Torque From Injection Unit 料筒组件 回转式螺杆 喷嘴 螺杆 加热 料斗 加料口 料筒 来自注塑单元的力和力矩 Injection Molding Screw Rotation Feeds and Shears Material Into a Melt. Melt Collects Into Front of Barrel, Forcing Screw Back Shot Rotation and Back Pressure 出量 通过螺杆回转，熔体聚集于料筒前部，反作用力使螺杆后退。 回转力矩和背压 Injection Molding Barrel Unit The Reciprocating Screw 150 100 50 25 50 75 125 150 100 Screw Dia in mm RPM SCREW SPEED Suggestions(8in/sec) 推荐螺杆转速 螺杆直径 转速 Injection Molding Melt Required to Fill Mold Ready for Injection Shot Injection Pressure 注射压力 Injection Molding Equipment Barrel Unit The Reciprocating Screw Screw Pushes Forward: Inject Cushion Packing Pressure 缓冲垫 保压 注射 Injection Molding Equipment Barrel Unit The Reciprocating Screw Injection Speed 注射速度 1000 100 10 100 1000 10000 LEXAN?141 @ 644 deg F LEXAN?141 @608 deg F LEXAN?141 @572 deg F A p p a r e n t V i s c o s i t y (Pa/s) Shear Rate (1/s) Injection Speed affects the viscosity of the molten material. 注射速度影响熔体粘度 表观粘度 剪切速率 Injection Molding Variables Injection Pressure Profile 注射压力曲线 H y d r a u l i c P r e s s u r e Time Fill Time Screw Run Time Back Pressure Peak Injection Pressure Pressure Applied by Injection Ram to Force the Plastic From the Barrel to the Mold. 注射压力峰值 液压压力 填充时间 Injection Molding Variables Cushion 缓冲垫 Cushion Material remaining in barrel when the ejection phase is completed. 注塑过程结束后，残于料筒前端的熔体 The injection molding process should allow a cushion to provide sufficient packing pressure in the mold 注塑过程必须要有缓冲垫以保证有效的保压 Injection Molding Variables Injection Flow 熔体流动 Injection Molding Process Injection Molding Process Injection Flow 熔体流动 Injection Molding Process Injection Flow 熔体流动 Injection Molding Process Injection Flow 熔体流动 Injection Molding Process Injection Flow 熔体流动 Mold Tempeature 模温 Mold Tempera