注射模塑技术

(36页)

'注射模塑技术'
e GE Plastics INJECTION MOLDING 注射模塑技术2001.8.21g Injection Molding Introduction Material Tooling 模具 材料 GOOD PART 好产品 Processing Design 工艺 设计g Injection Molding Equipment Equipment 设备g Injection Molding Equipment MACHINE SHOT SIZE 机器注射容量(PC) Part Weight = 20 - 75 % of Machine Shot Size 制件重量 = 20 - 75 % 机器注射容量 Optimal Part Weight = 40 ~ 60 % of Machine Shot Size 制件重量 = 40- 60 % 机器注射容量g Injection Molding Equipment CLAMP SIZE 锁模力 ? Material Selection 选料 ? Projected Area 投影面积 ? Part Design 产品设计 ? Wall Thickness 壁厚 ? Flow Length 流动长度 ? Injection Pressure & Speed 注射压力和速度g Injection Molding Equipment Screw Type Machines Are Recommended 推荐采用的螺杆类型 ?Uniform Plasticizing ?Uniform Stock Temperature 均匀塑化 均匀储料温度 ?Less Pressure Loss ?Streamlined Melt Flow 低压力损耗 线性熔融流动 ?Faster Cycles 更快成型周期g Injection Molding Equipment hm D hf Metering Transition Feed 计量 过渡 进料 L Screw and Cylinder Design 螺杆和料筒设计 ?L/D = 20:1 (16 ~ 24 :1) 压缩比 ?Compression Ratio = hf / hm =2 ~ 2.5:1 (1.5 ~ 3 :1) ?Cylinder bi-metallic for Abrasion Resistance ?双金属料筒g Injection Molding Equipment Reciprocating Screw Tip Assemblies Check Ring Type Nonreturn Valve Material Flows Past Open Check Ring Check Ring Slides Back To Prevent Black Flow During Injection Check Ring Valves are Suggestedg Injection Molding Equipment 往复式螺杆头结构 检查环类型: 止回环 熔融树脂流过 开放检查环 检查环关闭, 防止在 注塑过程中料的回流 建议采用止逆阀g Injection Molding Equipment Standard Cylinder Nozzles 标准料筒喷嘴 Heating Band 加热环 To Mold Cylinder Bore料筒 到模具 主体 Provides Mechanical and Thermal Connection From Hot Cylinder to Colder Mold 提供从热的料筒到相对冷的模具的机械和热连接g Injection Molding Radius 半径 Orifice 主流道孔口 Nozzle 喷嘴 Sprue Bushing 主流道衬套g Injection Molding Equipment Nozzle 喷嘴 ? Land Length 0.0 to 4.76mm ? Opening 4.76 to 9.52mm 开口: 4.76 ~ 9.52mm ? Sprue Bushing is 0.8mm Larger than Dimension on Nozzle 主流道衬套孔口要比喷嘴口径大0.8mm ? As Short as Possible 尽可能地短 ? Accurate heating control and Good Heater Band Covering 精确的加热控制和好的加热带覆盖g Injection Molding Process Processing 工艺 Start-up: 开车: ? Purge with the Correct Material 用正确料清洗 ? Use Correct Conditions 采用正确Processing加工参数 Downtime: 停车: ? Short time: Hold Material in Barrel for 10 ~15 min 短期: 存料10 ~ 15 分钟 ? Long time: Clean the Barrel 长期: 用正确方法和次序彻底清理g Injection Molding Process Recommended Purge Materials 推荐清洗料 Polymer Purge Material 聚合物 清洗料 Cycolac/Cycoloy PMMA, PS, SAN Lexan PC, PMMA, HDPEg Injection Molding Process Important Process Variables 重要加工参数 Melt Temperature 熔融温度 Mold Temperature 模具温度 Temperature Profiles 温度曲线 Residence Time 停留时间 Injection Speed 注射速度 Injection Pressure 注射压力 Pack Pressure 保压 Clamp Tonnage 锁模力 Cushion 缓冲料垫g Injection Molding Process Model of Amorphous Polymers Locked 固态 Stiff Flow Easier Flow Entanglemen ts 难于流动 较易流动 TG Raise Temperature of Polymer Adding Heat Increases Space 外热提供空间 B
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