塑料膜毕业设计

摘要

塑料作为一种可塑性很好的合成高分子材料已广泛应用于电脑、手机、汽车、家电、和玩具产品制造中，塑料模的发展具有着广阔的市场空间。本次设计的制件为玩具马主动齿轮，具有重量轻，强度高，易清洁的特点，为大批量生产产品。本文基于塑料成型的基本原理，特别是单分型面注射模具的工作原理，利用计算机辅助设计制造的基本方法，完成了主动齿轮的注射模设计。本套模具采用一模四腔、点浇口进料的一模两开三板式结构。同时通过对塑件进行结构工艺分析，本文还进行了模具分型面、型腔数目、浇口形式的确定，以及脱模机构，合模导向机构，冷却系统、成型零件等模具主要组成部分的设计。并用CAD绘制完整的模具装配图和主要零件的零件图。

关键词：塑料注射模主动齿轮

Abstract

As the synthetic polymer materials with good plasticity, plastic has been widely used in computers, mobile phones, automobiles, home appliances, and toys products manufacturing, which suggests that the development of plastic mold bears a broad market space. The designed parts of this time are toy horse active gears, with the characteristics of light weight, high strength, easy to clean, as mass production products. Based on the basic principles of plastic molding, especially the working principles of the injection mould with single parting surface, this paper completes the design of injection mould of the active gears, using the basic methods of designing and manufacturing with computers’ assistance. The set of moulds adopts the structure of a mold with four cavities and a mold of two-open and three-plate with a feed point gate model. Meanwhile through the structural process analysis of the plastic parts, this paper also points to fix the mold parting surface, the number of cavity, the form of the runner and design the major components of molds like the demolding mechanism, the whole mold steering mechanism, cooling system and the ready molded parts. And the complete mold assembling graph and the main parts graph are drawn through the use of CAD.

Key words: plastic; injection mold; active gear

目录

1 概述 (1)

1.1 全球塑料工业发展现状 (1)

1.1.1各国产业形貌 (1)

1.1.2各国优劣势分析 (1)

1.2 我国模具工业发展现状 (2)

1.3我国模具设计今后的发展方向 (3)

2 塑料制件的工艺性分析及材料选择 (5)

2.1成型塑料制件结构工艺性分析 (5)

2.2制件材料的选择 (5)

3 模具结构设计与计算 (7)

3.1型腔数目的配置与确定 (7)

3.2分型面的确定 (8)

3.3注塑机的选择 (8)

3.4浇注系统设计 (9)

3.4.1主流道的设计 (9)

3.4.2分流道的设计 (11)

3.4.3冷料穴和拉料杆的设计 (12)

3.4.4浇口的选择 (12)

3.4.5浇口的位置 (13)

3.5成型零部件的设计 (14)

3.5.1成型零件的结构设计 (14)

3.5.2成型零件的钢材选用 (15)

3.5.3定模型腔工作尺寸的计算 (15)

3.5.4动模型腔尺寸计算 (28)

3.6凹模的强度和刚度校核 (18)

3.7合模导向机构的设计 (19)

3.8顶出脱模机构设计 (21)

3.8.1脱模机构的要求 (21)

3.8.2塑件推出形式 (22)

3.8.3定模型腔工作尺寸的计算推杆布置形式 (22)

3.9冷却系统设计 (22)

3.10排气系统设计 (24)

3.11模架的选择 (24)

4. 注塑机相关参数的校核 (26)

4.1型腔数量的校核 (26)

4.1.1利用注塑机料筒塑化速率校核型腔数量 (26)

4.1.2按注塑机最大注射量校核型腔数量 (26)

4.1.3按注塑机额定锁模力校核型腔数量 (26)

4.2注射压力的校核 (27)

4.3锁模力的校核 (27)

4.4最大与最小模厚的校核 (28)

4.5开模行程的校核 (28)

5 模具装配图 (29)

设计总结 (31)

致谢 (32)

参考文献 (33)