摘要 模具工业是国民经济的基础工业，而塑料模具又是整个模具行业的霸主。我国的塑料成型模具设计，制作技术比较晚，整体水平还比较低，但近几年发展比较迅速。目前单单型腔的模具达80%以上，仍占主导地位。该设计通过对多种相似塑件的模具结构参考，设计的是聚乙烯塑件（某型口杯盖），采用的是一模两腔注射。该产品采用点浇口注射，和整体式型腔设置。型腔是由两瓣合模构成，利用斜导柱侧向分型，塑件的螺纹采用强制脱模。。 关键词：杯盖；注射模；瓣合模；侧向分型；设计； Abstract The mold i
ndustry is the
natio
nal eco
nomical fou
ndatio
n,a
nd the plastic mold also is the overlord i
n the e
ntire mold i
ndustry. It is quite late which the developme
nt of ma
nufacture tech
nology, the overall level is low i
n our cou
ntry.But the plastic mold is developi
ng quite rapidly i
n plastic take- shape mold desig
n area rece
nt year.Now, the si
ngle cavity mold is above 80%,a
nd still occupied a
n importa
nt positio
n.By researchi
ng ma
ny ki
nds of similarly models, I desig
ned a polyethyle
ne model, which ca
n i
nject two cavities i
n o
ne time.The products are pi
npoi
nt gated o
n the side,a
nd adopt i
ntegral cavity arra
ngeme
nt.The cavity is formed by two petal mold modules, a
nd side core-pulli
ng is through a
ngle pi
n. the thread is through forced ejectio
n. Key words: cup lid; i
njectio
n mold; petal mold module；side core-pulli
ng；desig
n; 目录 前言 1概述6 1.1塑料工业简介6 1.2我国塑料模现状7 1.3塑料模发展趋势7 2制品的分析8 2.1制品的简介8 2.2制品的工艺性及结构分析8 2.3注射成形过程8 3拟订模具的结构形式11 3.1确定型腔数量及排列方式11 3.2模具结构形式的确定11 3.3注塑机型号的确定11 3.4分型面位置确定14 3.5浇注系统的设计15 3.6脱模推出机构的确定25 3.7侧向分型与抽芯机构的设计26 3.8合模导向机构的设计29 3.9排气系统的设计31 3.10温度调节系统设计31 3.11模架的确定和标准件的选用35 3.12成形零件的结构设计和计算36 4塑料模材料的选用及技术要求41 4.1塑料模材料的性能要求41 4.2塑料模零件选材原则41 4.3塑料模材料选用41 4.4模具的精度要求42 5模具工作过程45 5.1成型前的准备45 5.2注射过程45 5.3脱模过程45 5.4制品的后处理45 总结47 参考文献48