注塑模塑技术.ppt

INJECTION MOLDING Injection Molding Introduction Injection Molding Introduction Injection Molding Equipment MACHINE SHOT SIZE 机器注射容量 Part Weight = 40 - 80 % of Machine Shot Size 制件重量 = 40 - 80 % 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 材料选择 投影面积 产品设计(制件厚度,流动长度) 注射压力 Injection Molding Equipment Injection Molding Equipment Injection Molding Equipment Injection Molding Equipment Injection Molding Injection Molding tooling Runner Tooling Runners Tooling Runners Tooling Runners Tooling Runners Tooling Runners Gate design Gating Gating Tooling Gating Tooling Gating Tooling Venting Tooling Venting Injection Molding Injection Molding Predry Injection Molding Process Injection Molding Process Injection Molding Process Injection Molding Process Model of Amorphous Polymers Injection Molding Variables Injection Molding Material Injection Molding Process Injection Molding Barrel Unit The Reciprocating Screw Injection Molding Equipment Barrel Unit The Reciprocating Screw Injection Molding Equipment Barrel Unit The Reciprocating Screw Injection Molding Variables Injection Molding Variables Machine Downtime 停机2小时以下时,建议将料管温度降低56degC. 停机2~8小时时,建议将料管温度降低至170degC. 停机超过8小时的,建议将料管清洗干净,且停止加热. 对于玻纤增强树脂,如果停机时间超过30分钟,应将料管清洗干净. Injection Molding Process Injection Molding Process Injection Molding Cooling Cooling system Injection Molding Closing  Smaller Larger Faster Colour Change Shorter Residence Time Lower Shear Lower Pressure Drop Melt Channel Sizing Runners – Heated Runners Heating the Manifold Runners – Heated Runners Parting Line Depth 0.035~0.075mm Gate 2.5mm Note Step 6mm(min.) 0.4~0.75mm 25~50mm Clearance Around Knockout .0025 Ejector Pin Molding Process 成型工艺 使用合适的设备,正确的条件对材料进行预干燥 Dry Environment -30C dew point Air Flow Rate 1 cfm/hourly lb of resin used Temperature 120C Time 4 hrs+ Processing 工艺 Start-up: 开机: Purge with the Correct Material 用正确料清洗 Use Correct Processing Conditions 采用正确加工参数 Recommended Pur