螺纹瓶盖塑料模具设计.doc

本科毕业设计(论文) 题目:螺纹瓶盖塑料模具设计 PAGE V 螺纹瓶盖塑料模具设计 摘 要 本课题通过对塑料螺纹瓶盖的结构分析，设计出了一套成型模具。针对产品的结构工艺性和具体模具结构，对模具的浇注系统、成型部分的结构、脱模系统、冷却系统、注塑机的选择及有关参数的校核进行了详细的分析与设计，同时还对一重要部件编制了加工工艺。该模具采用双分型面、点浇口、一模四腔的结构，通过对整个设计过程的反复校核，表明此次设计的模具能够达到塑件的强度要求。此课题重点对制品脱出过程进行了分析，推导出动、定模之间的开模速度与制件旋出速度之间的关系，保证螺纹瓶盖塑件从模具上顺利脱出，以实现自动化提高产量。通过最终校核表明该模具能达到质量和加工工艺的要求。 关键词：自动脱螺纹；注射模具；点浇口 Design of Injection Mould for Plastic Screw Cap Abstract Based on analyzing a plastic screw cap for structure, a set of shaping mould was designed. For the manufacturability of the cap and the specific structure of the mold, detailed analysis and design were done for the checking of the parameters of gating system, the structure of forming part, stripping system，cooling system，the selection of injection molding machine. And a processing has established for an important part at the same time. The mold uses the structure of double parting surface, point gate, a four-cavity mold. Much of the attention was put on the process of taking the plastic screw cap off the mould. The relationship between the speed of opening fixed and moving parts and the speed of taking off caps was deducted. Ensure screw cap plastic parts being removed from the mould smoothly to increase production by automation. The mould can achieve quality and processing requirements through the final check. Key Words：auto unscrewing；injection mould；point gate 主要符号表 P 螺距 Ph 导程 S 螺纹长度 IT 标准公差等级 B 齿宽宽度 i 传动比 m 齿轮的模数 Z 齿轮的齿数 V 线速度 E 弹性模量 ◎ 同轴度 ⊥ 垂直度 Qcp 塑料的平均收缩率 λ 螺纹升角 ψ 螺纹形状因子 α 螺纹牙尖角 Smax 最大收缩率 Smin 最小收缩率 f 塑料和钢材的摩擦因数 [бp] 许用应力 K 修正系数 Δs 塑件公差 Δz 型腔制造公差大小 对称度 圆柱度 平行度 目 录 TOC \o 1-3 \h \z \u 1 绪论 1 1.1模具的发展现状和发展方向 1 1.1.1注塑模具发展的现状 1 1.1.2注塑模具发展的趋向 1 1.2注射成型原理和工艺过程 2 1.2.1注射成型原理 2 1.2.2热塑性材料的注射成型工艺过程 2 1.2.3注