机械5

碟形螺帽注塑成型工艺及模具设计 摘要 注射模具在模具行业有着很重要的地位，而注射模具的发展离不开塑料工业的发展，注射成型是热塑性塑料成型的主要方法之一。通过这种方法可以制作出复杂的塑料制品，而且一副模具一个成型周期可以同时成型多个制件，生产效率高，因而广为采用。此次设计的题目是“蝶形螺帽注射模设计”。首先，需要进行工艺分析：确定分型面，浇注系统等，选择注射机，计算成型零部件的尺寸，确定是否采用冷却系统。然后进行结构设计：确定模架以及导向机构、紧固件选娶脱模机构设计等等。最后对模具结构与注射机的匹配和重要尺寸进行校核。此次设计要保证满足工艺要求和结构要求。 关键词：注塑模，塑料，注塑机，脱模机构 ABSTRACT I
njectio
n Mold has a very importa
nt positio
n i
n die i
ndustry, a
nd i
njectio
n mold developme
nt is i
nseparable from the developme
nt of the plastics i
ndustry, I
njectio
n moldi
ng of the thermosplasticity plastic moldi
ng o
ne of the pri
ncipal ways. Through this method ca
n produce complex plastic products, a
nd a mold formi
ng a moldi
ng cycle ca
n form more products, high productio
n efficie
ncy a
nd thus widely adopted. This desig
n is e
ntitled "butterfly
nut i
njectio
n mold desig
n". At First, the
need for process a
nalysis: decide the type face, gati
ng system, choose i
njectio
n machi
ne, the sizes’ calculatio
n of the moldi
ng parts, to determi
ne whether to adopt the cooli
ng system. The
n the structural desig
n: ide
ntificatio
n module racks, as well as guida
nce, the selectio
n of faste
ners, the desig
n of parti
ng a
nd so o
n. Fi
nally, the i
njectio
n mold structure a
nd the matchi
ng machi
ne size a
nd importa
nce check. This desig
n process to e
nsure that the tech
nology requireme
nts a
nd meet the requireme
nts i
n terms of the structure. Keywords: i
njectio
n mold; plastic; i
njectio
n moldi
ng machi
ne; the ejectio
n mecha
nism 目录 中文摘要I 英文摘要II 第一章概述..................................................................................................................1 1.1国际、国内塑料模具成型发展概况与对比...............................1 1.1.1国际塑料模具成型发展概况......................................1 1.1.2国内塑料模具成型发展概况..................................... 1 1.1.3我国模具与国际模具相比存在的主要问题............................ 1 1.2塑料模具设计方法主要发展方向..................................... 2 1.3设计课题资料查询.................................................. 5 1.3.1分析塑件结构及工艺技术要求........................................ 5 1.3.2了解注塑机的技术规格..............................................5 1.3.3了解塑件的工艺性能和加工性能，塑料熔体流动行为，塑料在模具内可能的结晶，取向及导致的内应力............................................... 7 1.3.4塑料的适用范围...................................................... 9 1.4设计思想简述................................................. 10 第二章塑料制件的工艺性分析及工艺结构设计.........................11 2.1成型塑料制件结构工艺性分析.............................................11 2.1.1尺寸精度分析....................................................... 11 2.1.2塑料制件结构设计................................................... 11 2.1.3粗糙度分析......................................................... 11 2.1.4斜度设计....................................................11 2.1.5壁厚设计....................................................12 2.1.6圆角设计....................................................13 2.2塑件三维CAD建模及CAE分析........................................13 2.2.1利用CAD建模，完成三维零件的设计...............................13 2.2.2 CAE分析及其不同方案结果比较：..................................14 2.3根据分析结论进行模具工艺设计........................................... 18 2.3.1型腔数量的决定..................................................... 18 2.3.2型腔布置........................................................... 20 2.3.3确定分型面.........................................................22 2.3.4确定浇注系统和排气系统............................................. 23 第三章选择注射机及注射机工艺参数校核................................. 31 3.1注塑机的技术规范.......................................................31 3.2注塑压力校核（可计算、可应用CAE分析结论）...............................31 3.3锁模力的校核...........................................................31 3.4模具厚度的校核..................................................32 3.5开模行程的校核................................................. 32 第四章模具设计................................................... 33 4.1确定标准注塑模架................................................ 33 4.2模具成型零件设计...................................................34 4.2.1成型零件设计.................................................34 4.3型腔成型尺寸计算.................................................37 4.3.1成型零件设计....................................................... 37 4.4模具主要零件选择…...................................................... 41 4.5脱模机构的设计................................................. 49 4.5.2脱模机构方案的确定................................ ........... 49 4.5.2齿轮传动的设计...............................................50 4.6模具冷却系统设计................................................ 55 4.6.1模具热平衡计算.............................................. 55 第五章绘制模具图................................................. 58 5.1绘制总装结构图.................................................. 58 5.2绘制重要零件图.................................................. 58 5.3校对、审图......................................................58 第六章结论......................................................................................................... 60 参考文献.........................................................................................................61 致谢.........................................................................................................62 附录A：圆柱齿轮参数计算程序63 附录B：圆锥齿轮参数计算程序65