机械5

塑料外壳注射成型工艺及模具设计 摘要 塑料是一种可塑性的合成高分子材料，具有重量轻且坚固，耐化学腐蚀，电绝缘性好，价格便宜，可塑性好等特点，广泛应用于电脑、手机、汽车、电机、电器、家电和通讯产品制造中。 注塑成形是成形塑件的主要方法之一，是指使用注塑机将热塑性塑料熔体在高压下注入到模具内经冷却固化获得产品的方法。注塑的优点是生产速度快，效率高，操作可自动化，能成型形状复杂的零件，特别适合大量生产。 本次设计的产品为按键，具有重量轻，强度高，耐腐蚀，易清洁等特点，为大批量生产产品。本次设计在针对产品进行工艺性分析后，确定模具分型面、型腔数目、浇口形式、位置大小其中最重要的是确定型芯和型腔的结构，方式。此外还进行了脱模机构的设计，合模导向机构的设以及它们的定位和紧固设计，冷却系统的设计等。最后绘制完整的模具装配总图和主要的模具零件图及编制成型零部件的制造加工工艺过程卡片。实践证明:该模具结构合理、可靠,并能保证产品质量,对此类注塑产品的模具设计有参考价值。 关键词:塑料注塑成形模具设计 I
njectio
n moldi
ng process a
nd mold desig
n of plastic butto
n Abstract Plastic is a sy
nthetic polymer material,with the characteristics of plasticity,lightweight,sturdi
ness,electrical i
nsulatio
n,a
ndwhich is resista
nce to chemical corrosio
n a
nd cheap.It iswidelyused i
n computers,mobile pho
nes,cars,motors,electrical,home applia
nces a
nd commu
nicatio
n products ma
nufacturi
ng. I
njectio
n moldi
ng is o
ne of the mai
n methods of formi
ng plastic parts,it refers to the use of plastic i
njectio
n machi
ne to i
nject the thermoplastic melts i
nto the mold u
nder high pressure,after cooled to obtai
n the products.It has the adva
ntage of fast productio
n speed,high productio
n efficie
ncy,a
nd automated operatio
ns,it ca
n form the shape of complexparts,particularlysuitable for mass productio
n. The productio
n of graduatio
n project is power butto
n,which has a lightweight,high stre
ngth,corrosio
n resista
nce a
nd easyclea
ni
ng features for mass productio
n.After a
nalysis the process of the product,the mold parti
ng li
ne,cavity
number,gate form,gate locatio
n ca
n be determi
ned,o
ne of the most importa
nt is to ide
ntifycore a
nd cavitystructures,aswell as their positio
ni
ng a
nd faste
ni
ng methods.I
n additio
n,it also carries out the desig
n of strippi
ng age
ncies,mold-orie
nted orga
nizatio
ns a
nd the cooli
ng system.At last,drawa complete mold assemblydrawi
ng,major parts diagram,a
nd drawup cards of parts ma
nufacturi
ng a
nd processi
ng process.It is proved that the mold structure is reaso
nable,reliable a
nd ca
n guara
ntee product quality,a
nd isvaluable for the i
njectio
n mold desig
n of such products. keywords: Plastic I
njectio
n moldi
ng Mold desig
n 目录 1绪论1 1.1模具工业产品结构的现状1 1.2模具工业技术结构现状1 1.3模具的发展趋势1 2.塑件的工艺分析4 2.1模具工艺规程的编制4 2．1．1塑件的原材料分析聚丙烯(简写为PP)4 2.1.2分析制品的工艺性和注射成型工艺规程对模具设计的要求5 2.1.3分析研究制品的生产纲领5 2.2根据塑件形状尺寸，估算塑件体积和重量6 2.3模腔的选择与设计7 3模具结构设计8 3.1主流道设计8 3.2分流道设计9 3.3冷料井及拉料杆设计9 3.4浇口设计10 3.5分型面的选择设计11 3.6排气结构的设计12 3.7合模导向机构的设计12 3.8顶出脱模机构设计13 3.9推板推出脱模机构13 3.9.1推板和型芯的配合位置13 3.10侧抽芯机构的设计14 3.11凹模的结构设计15 3.12凸模的结构设计17 3.13成型零部件工作尺寸计算18 3.15模具的工作原理和动作过程18 4注射机有关参数的校核19 5塑料模具的安装20 5.1模具的装配及调试21 结束语21 致谢22 参考文献23