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弯管接头注塑成型工艺及模具设计
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- 弯管接头注塑成型工艺及模具设计
目录
摘 要 ......................................................................................................................................................... I
Abstract ...................................................................................................................................................... II
第一章 绪论 ........................................................................................................................................... 1
1.1 塑料成型在工业生产中的重要性 ......................................................................................... 1
1.1.1 塑料及塑料工业的发展 ................................................................................................ 1
1.1.2 塑料成型在工业生产中的重要作用 ......................................................................... 1
1.1.3 塑料成型技术的发展趋势 ........................................................................................... 2
1.2 塑料模具的分类 ......................................................................................................................... 2
第二章 塑件成型工艺分析 ........................................................................................................... 4
2.1 塑件分析 ...................................................................................................................................... 4
2.1.1 总体分析 ........................................................................................................................... 4
2.1.2 脱模斜度 ........................................................................................................................... 4
2.2 ABS性能分析 .............................................................................................................................. 5
2.2.1 使用性能 ........................................................................................................................... 5
2.2.2 工艺性能 ........................................................................................................................... 5
2.3 ABS的注射成型过程及工艺参数 ......................................................................................... 5
2.3.1 注射成型过程 .................................................................................................................. 5
2.3.2 注射工艺参数 .................................................................................................................. 6
第三章 模具结构形式的拟定 ...................................................................................................... 7
3.1 分型面的确定 ............................................................................................................................. 7
3.1.1 分型面的形式 .................................................................................................................. 7
3.1.2 分型面的选择原则 ......................................................................................................... 7
3.1.3 本设计分型面的选择 .................................................................................................... 7
3.2 型腔数目和模具结构形式的确定 ......................................................................................... 8
3.2.1 型腔数目的确定 ............................................................................................................. 8
3.2.2 模具结构形式的确定 .................................................................................................... 8
3.3 注射机型号的确定 .................................................................................................................... 8
3.3.1 注射量的计算 .................................................................................................................. 8
3.3.2 浇注系统凝料体积的初步估算 .................................................................................. 8
3.3.3 注射机的选择 .................................................................................................................. 8
3.3.4 注射机相关参数校核 .................................................................................................... 9
第四章 浇注系统、冷却系统和排气系统的设计 ...........................................................11
4.1 浇注系统设计原则 ...................................................................................................................11
4.2 主流道设计 .................................................................................................................................11
4.2.1 主流道尺寸 .................................................................................................................... 12
4.2.2 主流道的凝料体积 ....................................................................................................... 12
4.2.3 主流道当量半径 ........................................................................................................... 12
4.2.4 主流道浇口套的形式 .................................................................................................. 12
4.3 分流道设计 ............................................................................................................................ 13
4.3.1 分流道设计原则 ........................................................................................................... 13
4.3.2 分流道的布置形式 ....................................................................................................... 13
4.3.3 分流道相应参数的确定 .............................................................................................. 14
4.3.4 校核剪切速率 ................................................................................................................ 14
4.4 浇口的设计 ................................................................................................................................ 15
4.4.1 浇口形式及尺寸确定 .................................................................................................. 15
4.4.2 侧浇口剪切速率的校核 .............................................................................................. 15
4.5 校核主流道的剪切速率 ......................................................................................................... 16
4.6 冷料穴的设计与计算 ............................................................................................................. 17
4.7 温度调节系统 ........................................................................................................................... 17
4.8 排气系统 .................................................................................................................................... 17
第五章 成型零件的结构设计及计算 .................................................................................... 18
5.1 成型零件的结构设计 ......................................................................................................... 18
5.1.1 型腔的结构设计 ........................................................................................................... 18
5.1.2 型芯的结构设计 ........................................................................................................... 18
5.2 成型零件材料的选用 ............................................................................................................. 18
5.3 成型零件工作尺寸的计算 .................................................................................................... 18
5.3.1 型腔尺寸计算 ................................................................................................................ 18
5.3.2 侧抽芯凸模尺寸计算 .................................................................................................. 19
第六章 模架组合的选择 ............................................................................................................... 21
6.1 决定模板尺寸的因素 ............................................................................................................. 21
6.2 模架的选择 ................................................................................................................................ 21
第七章 合模导向机构的设计 .................................................................................................... 22
第八章 脱模推出机构的设计 .................................................................................................... 24
8.1 推出方式的确定 ....................................................................................................................... 24
8.2 推出位置、推杆数量和断面形状的设计 ......................................................................... 24
8.3 推杆复位装置 ........................................................................................................................... 24
第九章 侧向分型与侧抽芯机构的设计 ............................................................................... 25
9.1 抽芯距与抽芯力的计算 ......................................................................................................... 25
9.1.1 抽芯距的计算 ................................................................................................................ 25
9.1.2 抽芯力的计算 ................................................................................................................ 25
9.2 斜导柱的侧向分型与侧抽芯机构的设计要点 ............................................................................ 26
9.2.1 斜导柱的设计 ................................................................................................................ 26
9.2.2 滑块的设计 .................................................................................................................... 28
9.2.3
摘 要：
塑料工业是当今世界上增长最快的工业门类之一，而注塑模具是其中发展较快的种类，因此，研究注塑模具对了解塑料产品的生产过程和提高产品质量有很大意义。 本设计介绍了注射成型的基本原理，特别是单分型面注射模具的结构与工作原理，对注塑产品提出了基本的设计原则；详细介绍了冷流道注射模具浇注系统、温度调节系统和顶出系统的设计过程。弯管接头具有两个方向的侧向抽芯。本设计分析了弯管接头的成型工艺，确定了工艺方案，介绍了模具结构和主要模具零部件的设计，分析了本模具结构及产品质量上的可行性及可靠性。 关键词：弯管接头；注射模；成型工艺；侧向抽芯
Class x, Material Processing and Controlling Engineering, School of Mechanical Engineering, xx University. Xx, xx, xx Province, P.R.CHINA
Abstract:
Now The plastic industry is one of the quickest developing industry classes in the world, and the injection mould is one of the developing type. Therefore, there is great significance to study the injection mould to understand that the plastic of production process and improve the product quality. The basic principle of injection molding, specially the operating principle and the structure of the single-parting-surface injection mould is introduced. The design of the runner system, temperature control system and the ejection is introduced in detail. The technology for forming the elbow joint is analyzed and a better technics is decided .The elbow joint has two side core-pulling in different directions. The structure of the mould and the designing of the main parts are introduced. The feasibility and reliability in mould structure are discussed to guarantee the quality of the product.
Keywords: elbow joint; injection mould; forming process; side core-pulling
该塑件如图2-1所示，材料为ABS，流动性能为中等，溢料间隙为0.05mm，塑件最大壁厚为4mm，最小壁厚为1.5mm，未注圆角为R3mm，精度等级为SJ1372-78中4级精度，属于中等精度塑件。经分析，该塑件可用注塑成型，但模具设计时应考虑两个方向的侧抽芯问题。 图2-1 弯管接头
2.1.2 脱模斜度
ABS属于非结晶型热塑性塑料，其成型收缩率较低，一般介于0.4%～0.7%，结合该塑件的特点，不需要设计脱模斜度。
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2.2 ABS性能分析
2.2.1 使用性能
ABS是树脂的刚性与橡胶的弹性相结合的一种广泛使用的工程材料，它不仅具有韧、硬、刚相均衡的优良力学性能，而且耐化学药品性好、尺寸稳定性好、表面光泽度高，且原料丰富。广泛用于机械、电器零件、办公用品、日用品等各个领域。
2.2.2 工艺性能
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