塑料三通模具设计及三维造型 - 图文

西南科技大学城市学院本科生毕业论文 Ⅰ

塑料三通模具设计及三维造型设计

摘要:塑料工业是世界上增长最快的工业之一。目前，塑料已深入到国民经济的各个部门中，由于ABS塑料具有较高的机械强度和良好的综合性能，所以它广泛运用于电子工业、机械工业、交通运输、建筑材料、玩具制造等行业中。本设计为：ABS三通管的注射模设计，其中包含三通设计和注射模的设计。三通接头设计时应考虑塑件成型、抽芯距等问题，注射模设计时应考虑：抽芯机构的选择、注射机的选择、分型面的确定、浇注系统的设计、冷却系统的设计等。一套完整的注射模模具包含许多的零部件，但是为缩短模具设计与制造的时间、成本等因素，我们选择零、部件时尽可能的选用国家标准所制定。

关键词： ABS塑料； 三通管； 注射模

西南科技大学城市学院本科生毕业论文 Ⅱ

Plastic tee mold design and three dimensional moldlling design

Abstract：Plastic industry is one of the fastest growing industries in the world. At present, the plastic of the national economy already deep into each department, ABS plastic be used in the electronics industry, machinery industry, transportation , building materials and toy manufacturing industry etc due to it’s mechanical strength and good comprehensive performance, his design for: ABS tee joint of injection mould design, including tee design and injection mould design. Tee joint design should be considered when plastics molding, core-pulling pitch problems, injection mould design should consider: core-pulling mechanism selection, injection machine selection, points to determine the type and the design of gating system, cooling system design, etc. A complete set of injection mould contains many parts, but for shortening the mold design and manufacturing time, cost factors, we choose to zero, components as possible for the selection of national standards. Key words: ABS plastic， three-way pipe， injection mould

西南科技大学城市学院本科生毕业论文 Ⅲ

目 录

第1章 前言 ....................................................................................................................... 1

1.1 概述 ......................................................................................................................... 1 1.2 ABS塑料的发展前景 .............................................................................................. 2 1.3 ABS塑料注塑工艺分析 .......................................................................................... 3 第2章 塑件成型工艺性分析 ........................................................................................... 5

2.1 塑件的分析 ............................................................................................................. 5

2.1.1 塑件图 ........................................................................................................... 5 2.1.2 外形尺寸 ....................................................................................................... 5 2.1.3 精度等级 ....................................................................................................... 5 2.1.4 脱模斜度 ....................................................................................................... 6 2.1.5 ABS的性能分析 ............................................................................................ 6 2.1.6 ABS的注射成型过程及工艺参数 ................................................................ 7

第3章 拟定模具结构形式 ............................................................................................... 8

3.1 分型面位置的确定 ................................................................................................. 8

3.1.1 分型面的选择原则 ....................................................................................... 8 2.1.2 分型面的确定 ............................................................................................... 8 3.2 型腔数量和排列方式的确定 ................................................................................. 8

3.2.1 型腔数量的确定 ........................................................................................... 8 3.2.2 型腔布置方式 ............................................................................................... 9 3.3 注射机型号的确定 ................................................................................................. 9

3.3.1 注射量的计算 ............................................................................................... 9 3.3.2 浇注系统凝料体积的初步估算 ................................................................. 10 3.3.3 注射机的选择 ............................................................................................. 10 3.3.4 注射机的相关参数的校核 ..........................................................................11

第4章 浇注系统的设计 ................................................................................................. 13

4.1 浇注系统的功能 ................................................................................................... 13

4.1.1 浇注系统的组成 ......................................................................................... 13 4.1.2 浇注系统设计原则 ..................................................................................... 13 4.2 主流道的设计 ....................................................................................................... 14

西南科技大学城市学院本科生毕业论文 Ⅳ

4.2.1 主流道尺寸 ................................................................................................. 14 4.2.2 主流道凝料体积 ......................................................................................... 15 4.2.3 主流道当量半径 ......................................................................................... 15 4.2.4 主流道浇口套的形式 ................................................................................. 15 4.3 分流道设计 ........................................................................................................... 16

4.3.1 分流道的布置形式 ..................................................................................... 16 4.3.2 分流道的长度 ............................................................................................. 17 4.3.3 分流道的形状及尺寸 ................................................................................. 17 4.3.4 凝料体积 ..................................................................................................... 18 4.3.5 分流道剪切速率的校核 ............................................................................. 18 4.3.6 分流道表面粗糙度 ..................................................................................... 19 4.4 浇口的设计 ........................................................................................................... 19

4.4.1 浇口形式的确定 ......................................................................................... 19 4.4.2 浇口位置的选择 ......................................................................................... 19 4.4.3 浇口尺寸的确定 ......................................................................................... 20 4.4.4 浇口剪切速率的校核 ................................................................................. 20 4.5 主流道剪切速率的校核 ....................................................................................... 21

4.5.1 计算主流道的体积流量 ............................................................................. 21 4.5.2 计算主流道的剪切速率 ............................................................................. 21 4.6 冷料穴的设计及计算 ........................................................................................... 21

4.6.1 冷料穴的主要形式 ..................................................................................... 21 4.6.2 冷料穴的设计 ............................................................................................. 21

第5章 成型零件的结构设计和计算 ............................................................................. 23

5.1 成型零件的结构设计 ........................................................................................... 23

5.1.1 凹模的结构形式 ......................................................................................... 23 5.1.2 凹模的结构设计 ......................................................................................... 23 5.2 成型零件工作尺寸的计算 ................................................................................... 24

5.2.1 型腔尺寸的计算 ......................................................................................... 24 5.2.2 侧型芯尺寸的计算 ..................................................................................... 26 5.3 成型零件尺寸及动模垫板厚度的计算 ............................................................... 27

西南科技大学城市学院本科生毕业论文 Ⅴ

5.3.1 侧壁厚度的计算 ......................................................................................... 27 5.3.2 动模垫板厚度的计算 ................................................................................. 28

第6章 模架的确定 ......................................................................................................... 30

6.1 模架概述 ............................................................................................................... 30 6.2 模架分类 ............................................................................................................... 30 6.3 模架的选择 ........................................................................................................... 31

6.3.1 各模板尺寸的确定 ..................................................................................... 31 6.3.2 垫块尺寸 ..................................................................................................... 33 6.4 模架各尺寸的校核 ............................................................................................... 34

6.4.1 平面尺寸的校核 ......................................................................................... 34 6.4.2 高度尺寸的校核 ......................................................................................... 34 6.4.3 开模行程的校核 ......................................................................................... 34

第7章 排气槽的设计 ..................................................................................................... 35 第8章 脱模推出机构的设计 ......................................................................................... 36

8.1 脱模机构设计原则 ............................................................................................... 36 8.2 推出方式的确定 ................................................................................................... 36 8.3 脱模力的计算 ....................................................................................................... 37 8.4 顺序脱模机构的设计 ........................................................................................... 37 第9章 侧向抽芯机构设计 ............................................................................................. 39

9.1 侧向分型与侧向抽芯机构分类 ........................................................................... 39 9.2 侧型芯的设计 ....................................................................................................... 39

9.2.1 结构设计 ..................................................................................................... 39 9.2.2抽芯方式 ...................................................................................................... 40 9.2.3 侧型芯导套的设计 ..................................................................................... 40 9.2.4 齿轮的设计 ................................................................................................. 40 9.2.5 固定架的设计 ............................................................................................. 41 9.2.6 传动轴的设计 ............................................................................................. 41 9.2.7 手柄的设计 ................................................................................................. 42 9.3 抽芯力的计算 ....................................................................................................... 42 9.4 校核侧抽芯时作用在塑件上的单位压应力 ....................................................... 43

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