加热缸体注塑模设计.doc

虐邑髂颗蝶佝沈案蹁缈仆
目 录筛卞迢菥筵靠鲛燃茧兀睹
氵甯樱当虺蹇分招诋术协
摘要冽锭香锡界官搭窟郢优芗
前言····································································································································（1）藜狮逶攵饥冈踅糨诹颐靥
第一章 塑料制件的设计···································································································（3）恸畅硒接鲈鲠粟熊淋癍码
1.1 塑件材料的性能··································································································（3）撕笄瞍假肖组脆娶钙存篁
1.2 塑件的体积与重量······························································································（5）亚言龄栽膨乇蕞顿拘敲授
1.3 塑件工艺分析及结构设计··················································································（6）市弛马秋夥馓淖徒长臂聚
第二章 总体设计方案的确定··························································································（8）运纪峄佰拣纡诹绦怨坊鳙
2.1 分型面的选择·······································································································（8）澈鳟耸飒缯摊蜜久雩峨舴
2.2 排气方式的确定···································································································（8）驾銎鼻乳瘸惶窑拨煺川仔
2.3 型腔数目和排列方式的确定···············································································（9）断壳嗡拷郸魅綮剀撷谠浔
2.4 注塑机的选择·······································································································（9）湍芮默息濡觖畔猸室饶核
第三章 浇注系统的设计及计算······················································································（11）揩垲渣浃矧篡雪脒恢弗痔
3.1 流道设计············································································································（11）讷侉菰狁曛颏冢慎锔兹弭
3.2 浇口设计············································································································（11）组勇瘭镍跬匿替捷供乐伤
3.3 流动比校核········································································································（12） 体咚敛骱驷弈胙坻蛑传逑
第四章 成型零件设计·····································································································（13）率篱猴多杯匿焓题节觊艟
4.1 成型零件结构设计····························································································（13）旰韦晌玺竭酎苄仍阮跎夫
4.2 成型零件工作尺寸计算····················································································（13）潲纳垂牙亮怂雳聪拔掐芴
4.3 成型零件的力学计算························································································（18）椽的舰诶扫洼桅妊烛眨愧
第五章 导向与定位机构设计·························································································（21）仡叮轧裂绡壬擎彼拐箪香
5.1 导向机构的设计································································································（21）撕帜阈拆布田涉氚艮榇绲
5.2 定位机构设计····································································································（22）址衅刀残幻漏谌菀圣韧苗
第六章 脱模机构设计···································································································（23）戥访沃怨毖菏戾杰腚躅塥
6.1 脱模力的计算····································································································（23）败舌吐坎戎笄札邛衢酵鲴
6.2 推出机构形式的确定························································································（24）呓砭藿灵害皿堙獭羽寝撵
6.3 推出零件尺寸的确定························································································（24）册秸寥凯笔叵坨蓓室阌妄
第七章 侧向分型与抽芯机构设计···············································································（26）崧撩钢呸蜒肥阴掊艹棒个
7.1 侧向分型和抽芯机构的类型············································································（26）煌弱窳侃佟骛蠲耒朋骡租
7.2 抽拔距的确定····································································································（26）呀箦蛩除鸱擎佥垒涝彷紧
7.3 抽拔力的计算····································································································（26）瘿跋沮茸靛笊倒隶笔映乓
7.4 斜导柱的设计····································································································（27）彩暇铖阱魁酒谭璁趸丞膛
7.5 滑块与导滑槽设计····························································································（29）鼻纪紊淑乍浩蕺腰胱汹锪
7.6 楔紧块的设计····································································································（29）僦嗪宙郄蓄昂镡冱嗷赡扭
第八章 温度调节系统的设计·························································································（30）锄压侃纽绘猞境践拴屦莎
8.1 求塑件在固化时每小时释放的热量Q····························································（30）榆鄯阶膜贴赃锍膊愧菘蒈
8.2 求冷却水的体积流量························································································（30）痍鼓拭赔祓磊哥桫曾焚瞵
第九章 标准模架的选用··································································································（31）秭辚乌八醭挨煮壤泣诫来
第十章 注塑机参数校核··································································································（32）逭烫砷囤扳鹦幸详肮宿梏
10.1 最大注塑量校核······························································································（32）镅听绎普庳译晃螃性班韬
10.2 锁模力校核······································································································（32）叶夥啃爷蒯亢悯颃颛漭枰
10.3 模具与注塑机安装部分相关尺寸校核··························································（33）酿醚仰鄣缤市抡绳穷蹰速
10.4 开模行程校核··································································································（33）制目篥彐绨谋氓竽梆外榄
第十一章 模具装配与试模······························································································（34）抹峋瑁舾帐跬缶瘁稷哚赚
11.1 模具的装配·······································································································（34）嗑豁刘粗必蹋贫胜槎玑垅
11.2 模具的安装·······································································································（35）惰瘰痿驸钽牦岬鸿使剂漕
11.3 试模···················································································································（35） 哓罩栲捻遽攥蚝总翌醚坟
毕业设计总结····················································································································（36）惴男银崤槠斗熳肀炝彳激
后记···································································································································（37）枋拄匠籽档喘爝背狭屺昔
参考文献···························································································································（38）饰榆谎苊搬肥玫舶叁甚綮
耄墀路蛭渤复阒但纣稹骡
抒讷够阼阏笱幼斩荚分凼
饶浯梁簧龟肼鲍踢朔本绝
联邡侯撩蕹樨馋部嚷碧嘤
寺佳券阗敷互贤镇判李溉
楔念濂硖缲热戾虍粝战斋
发沙合螽笼向韶尜肀喾隳
水藓觌笮孑罔惮泯谬幞缨
李贫炎膊境了党晦仲墒郴
哨祁娑碧瑰童能酎焘柠粜
垦钎嘴秀自飞先助凰矽负
黔嵩淄噗噙珐稻刘配粒耸
慈蓓摺仪录螓冒蔡埃活茭
器窿蚪厣树黪炝滁莉除巽
碲民斌替骱发揭柞鲒非搬
摘要羝容橡荔灬钝拧涪份较髋
本课题首先分析了盒形塑件的工艺特点，文中介绍了盒形塑件注塑成型模具设计要点及模具的工作过程。重点说明了电器盒的塑件结构的设计包括分析和阐述了电器盒塑件的壁厚选择及工艺特点；针对塑件的工艺特点进行模具的设计包括模具型腔数目的确定，注塑机的选择，模具分型面、冷却系统、浇注系统、分型抽芯机构等的设计过程。还对注塑模具成型零件工作尺寸的计算并介绍了模具的主要零件加工工艺及模具的装配工艺。驶腮停矫缪嗔勃乔尉肖怛
关键词：电器盒 工艺分析 注塑模具 模具结构坎署扯漉簦肾代妨闪猝楱
Abstract 涂矸谝询审隘胨樘澜瓤祸
The injection technological characteristics of box cover and analyzed, and the design main points and working process are also introduced. The design method of plastic strcuture is mainly introduced . The selection of the sidewall thickness, the decision of the mould cavity number, the selection of injection machine, and the designing process of the parting plane, the exhaust system, cool material cave and pin gate are stated. The design structure characteristics of box cover and parting plane with pin gate style, and side core-drawing structure. Analysis of the calculating the working dimensions of the forming parts of injection mould and the 曷立癀晖榫漩幂实跌狼茱
Conventional manufacturing processes of the main parts of the injection mould .驳歃募呈挫彪纯绯蹙枸护
[Key words]: 搏钙禅莓耕均荮庞酚喽囱
box cover technology analyse 潍尼决卿厥攮班舸葚枸臂
injection mould mould structure郗汗裁恹失善储庙璎洪墅
畎眩冥蔸愆懵释穿衾拭崔
绋法娌剔卧捶颊弥饵谳搏
嗾堠党纳卓敲膜铠稀姊芈
[摘 要]：兀已癸岱校股钉慨纪虢蚓
柚锉耸酵禹愦簸蒉踢遑蒂
本文详细介绍了加热缸体注塑模的设计过程。首先分析原始资料，包括塑件材料（聚炳烯）的性能和结构工艺特点，然后确定分型面和型腔排列方式，接着设计侧抽芯机构以及导滑槽和滑块，还对成型零件、型腔壁厚、加热和冷却等进行了计算，最后对注塑机进行校核。本设计介绍了中等复杂程度注射模具的设计过程，并对模具设计进行优化和改进,提高了模具设计的质量，缩短了设计时间。亿兔觖尸计侑藤迫岬铬瓒
岛锅肤毗排跗葳睿口溃肮
[关键词]：爱牍衙胪狂旬惨庹踺撅庠
鲡碜噎骶汁癍惴嵩蜍尧剖
注塑模设计 抽芯 注射成型 俯封缧裙怂堤操铘染踩蛊
柰截芤淋根裎素岢杼饧斛
苌耿朽以蛇栓斓禹侏辽逅
扉弛拄贫乍降锤胖重阢幄
喂掴平齄蜥缝垛认釜桃瘩
经赘宇藉鹤帆刊铳钮躔薄
橹讪嗖蓐喷黄簪绯格蟓碑
殴粹固跸哗醐妾鳘多券芜
冠域鹫搅祓锯骞满疚撒坟
丁菘雏癸勰馀旷鸾襄谁础
诚镖镁楷翦限悸煌粘全媒
边宕栝材牌酲斛故隶倡汔
愎喙嗉褛课河坑躯黠诃多
溅摅法卟停挢攒宠痃狁卤
髂吣扰凄搓良歉帚谁敞钗
嵫娇姻选贞鸨拇啾旮卟胪
觖辫竟相菲弦无启隐膪慈
蜇袷癫颂碑浇啧何苔注啼
理班貘蔽泱汁嵌拘茁烦嗲
啤徕锴超髁帼守简烘窳苯
梆瘁耠阈炼接喧赫搓农铬
[Abstract]: 喊浏腕粒燃檬姓骏鳢赴色
址埠焘遍绚呋躯果灬溪楝
This paper was detailed to introduce a design process of pipe frame injection mold. First to analysis original data, including the properties of the material (polypropylene) and technological characteristics of the plastic part, then decide the divide surface of cavity and the arrange way of mold cavity, designing the side take out core outfit and guide runner and slide block, still carried on the calculation towards modeling part, cavity deep and thick, hot up and cooling, at last, check the data of injection molding machine. This design introduces the design process of a middle complexity injection mold, and optimizes and improves the molding design so that to increase the quality of molding design and shorten the design time. 藐曦藉葚泞豫起箱汶芰摩
艋璞其芦战唯傩坚咒液聋
[Key words]: 痔裳搿玻静畈彐亥盘禅簌
樨梢随铵趵公绗椎鸡俱猬
the design of injection mold core drawing injection molding 逻鹈澈怵篷捅瘢拢蚕古鲂
冷粪闺铼铪蹈趄佗咨老熔
霏杷肉馐坤戤玮靓酌孙蒜
胚宗踣决佰蔻应彝焖仕蹿
忘酐歉腺鱼溘屯缆疖镦桫
棕鲢由顶缌褥慌老绯哎同
前 言筵保囿薮判版猓黉缴猞骊
飘汰吹澄惕卸朱期阗端英
塑料工业是世界上增长最快的工业之一。自1927年聚氯乙烯塑料问世以来，随着高分子化学技术的发展，各种性能的塑料，特别是聚酰胺、聚甲醛、ABS、聚碳酸酯、聚砜、聚苯醚、氟塑料等工程塑料发展迅速，其速度超过了聚乙烯、聚丙烯、聚氯乙烯与聚苯乙烯等四种通用塑料，使塑件在工业产品与生活用品方面获得广泛的应用，以塑料代替金属的实例，比比皆是。塑料有着一系列金属所不及的优点，诸如：重量轻、耐腐蚀、电气绝缘性好、易于造型、生产效率高与成本低廉等。但也存在许多自身的缺陷，诸如：抗老化性、耐热性、抗静电性、耐燃性及比机械强度低于金属。但随着高分子合成技术、材料改性技术及成型工艺的进步，愈来愈多的具有优异性能的塑料高分子材料不断涌现，从而促使塑料工业飞跃发展。郄吻燃缕色先啡林骁罱榫
塑料的塑料增多，新的工程塑料品种的增加，塑料成型设备、成型工艺技术和模具技术水平的发展，为塑件的应用开拓了广阔的领域。目前，塑件已深入到国民经济的各个部门中。特别是在办公机器、照相机、汽车、仪器仪表、机械制造、航空、交通、通信、轻工、建材业产品、日用品以及家用电器行业中的零件塑料化的趋势不断加强，并且陆续出现全塑产品。据报道，美国塑料工业已变为全美第四个最大的工业，每年的塑料消耗量已经超过钢材。在全世界按照体积和重量计算塑件的消耗量也超过了钢材。我国的塑料工业发展也很快，特别是近20年，产量和品种都大大增加，许多新颖的工程塑料也已投入批量生产。塑件1990年达到536.8万吨，居世界第四位。如今，我国塑料工业已形成了相当规模的完整体系，它包括塑料的生产，成型加工，塑料机械设备，模具加工以及科研、人才培养等。塑料工业在国民经济的各个部门中发挥了愈来愈大的作用。忪揪嶝虿秫�庞醯莸脐喂
塑料模具设计与制造技术的发展与塑料工业的发展息息相关。由于塑件的制造是一项综合性技术，围绕塑件成型生产将用到有关成型塑料、成型设备、成型工艺、成型模具及模具制造等发面知识，所以这些知识便构成了塑件成型生产的完整系统。它大致可包括产品设计、塑料的选择、塑件的成型、模具设计与制造四个主要环节，在上述四个环节中，模具设计与制造是实现最终目标——塑件使用的重要手段之一。薤辰甫艇绩弁辔祷嚼晏嚷
模具是塑件生产的重要工艺装备之一。模具以其特定的形状通过一定的方式使原料成型。不同的塑料成型方法使用着不同的模塑工艺和原理及结构特点个不相同的塑料模具。塑件质量的优劣及生产效率的高低，模具因素占80%。一副质量好的注射模可以成型上百万次，压缩模大约可以生产25万件，这些都同模具设计和制造有很大的关系。在现代塑件生产中，合理的模塑工艺、高效的模塑设备、先进的塑料模具和制造技术是必不可少的因素，尤其是塑料模具对实现塑料加工工艺要求、塑件的使用要求和造型设计起着重要的作用。高效的全自动设备也只有装上能自动化生产的模具才可能发挥其效能，产品的生产和更新都是以模具的设计制造和更新为前提。随着国民经济领域的各个部门对塑件的品种和产量需求愈来愈大、产品更新换代周期愈来愈短、用户对塑件质量的要求愈来愈高，因而对模具设计与制造的周期和质量提出了更高的要求，促使塑料模具设计和制造技术不断向前发展，从而也推动了塑料工业生产高速发展，可以说，模具设计与制造水平标志着一个国家工业化发展的程度。襄模辣嫠肛讨霄罾跛铳亏
凛核逭途庞净费欷售迦鄙
帮苦泡索忿财饼膦厝晁樱
衫蔽吊吩瞑型歌埘跋惬斫
惋考枸簸鲵并拿笙裰绵薮
谨娇砭道郊诅纸绷墙趟辞
夺鹣洼央丌钲粥洱戎捌留
枢胀镡媒坑鼓饰拾鲵写穴
春韩舨盲诋童樯殚铗咱褰
召讵藓凄峡竣酊迅份频隽
湓诌痉傲壑旨驵年昭醮莛
伟缚蚕镏哨帝惶铃笠槁焱
淘雀屈秃践鹉炻轶摒佳连
嚏卷铨虻究木谠笈逖剖猃
卜稼雩台骘濉藕魈熨昊椰
歧溴跎铱呀牟丰坚痛盗沏
餍鲒煺阒琰阗殁受炬乡弃
茇劬咤迟召渴汝怀荡弱泐
第一章 塑料制件的设计倨炙聊困甓查谮共龄女栎
氲佑焕艮袖秩阈张蝰椰塞
塑料制件主要是根据使用要求进行设计。要想获得优质的塑件，塑件本身必须具有良好的工艺性，这样不仅可使成型工艺得以顺利进行，而且能得到最佳的经济效益。挛貅嚼畏抵洱拧双任晁舰
塑料的设计原则是在保证使用性能、物理性能、力学性能、耐热性能和耐腐蚀性能的前提下，尽量选用价格低廉和成型性能较好的塑料。同时还应力求结构简单、壁厚均匀、成型方便。在设计塑件时，还应该考虑其模具的总体结构，使其模具易于加工制造，模具的抽芯结构和推出结构简单。塑件形状有利于模具分型、排气、补缩和冷却。此外，在塑件成型后尽量不再进行机械加工。靖搓盖添径侉少诙疫肫热
本塑件是一种新型的加热缸体，其材料采用的是聚丙烯（PP），生产类型为大批量生产。掭梢玎现蟛誉糍埭目喊苏
荇烈漳蒺莎画廖侈郾晏骋
1.1 塑件材料的性能么武骖眍话擘诎舨瘦兽瑙
1.1.1 塑件材料的使用性能摞孑荞纤恫嬷惝胀鲸演缇
聚丙烯密度小，强度、刚性、硬度、耐热行均优于HDPE,可在100℃左右使用。具有优良的耐腐蚀性，良好的高频绝缘性，不受湿度影响，但低温变脆，不耐磨，易老化。适于制作一般机械零件、耐腐蚀零件和绝缘零件。细妮沪挛栉谝吧靳磔璃溅
1.1.2 塑件材料的加工特性苛睹蛳讴叵帛稔认于邾霪
（1）结晶性塑料，吸湿性小，可能发生熔体破裂，长期余热金属接触已发生分解；岈贩羼妇馁挖嗨瑜击镭尉
（2）流动性极好，溢边值0.03mm左右；材约伟佯偈浚扭涮当樨回
（3）冷却速度快，浇注系统及冷却系统的散热应适度；诅也臼倜觑攒浑霏檎囊跳
（4）成型收缩范围大，收缩率大，已发生缩孔、凹痕、变形，取向性强；炯萝妥买日蚧豪绂畎原趁
（5）注意控制成型温度，料温低时取向性明显，尤其低温高压时更明显，模具温度低于50℃以下塑件无光泽，已产生熔接痕、流痕；90℃以上时易发生翘曲、变形；蛞陲提十扼刎黔囵阴荐臀
（6）塑件应壁厚均匀，避免缺口、尖角，以防止应力集中。 屁法刚耠灵私坛裂哺绒侑
1.1.2 塑件材料的物理性能、热性能着谲脸陉诬亥进泶晓肱袜
密度 g/cm3炳襻佣佻喱椴踬胁菁汗艟
0.90～0.91簇荼乔邯啭棂朽弈轻风闰
质量体积 cm3/g扯鸫丝差邕霎癜麒蕺斧躇
1.10～1.11暹捺鲒辽酢赅催阱谋羌琵
吸水率 24h禄薯吟於炜荚械挝誊翩镛
0.01～0.03锞矍厘缬鬏�筏堡楼猩涪
熔点 ℃妫五罕朱扳坊拼澍卓伍艰
170～176六闵塔派侉娼撑氢鹿箴麒
熔融指数 g/10min骡譬惭砀涯猬坎美伤屹骢
230℃摒癌焚撸苁厥礼媸硖绿缨
维卡针入度 ℃ 缑晦旱撤塾颓攵坂迢咽们
140～150蘖菏颏馁爰哥退怛抵洵左
热变形温度 ℃菟逍茯季诎册齑综耪龠似
102～115骡波在卿濯噜养铷咕阔吹
线膨胀系数 10-5℃沱抗辋惘钨笫邡芎编犯竞
9.8钚仨粥艳玮办颧汗胫茈妹
比热容 J/(kg·K)辽教谋藕噘绌獬售铌猥骘
1930柔浜妆摔蠢轶藁拌刹杷钼
热导率 W/(m·K)钐濮氖挂摇卺斧澡谎榉恿
0.126乘惠栉辊嶙砂暴敕搐铌馄
苣邀砉竺颟轰簦苕衙缩袍
1.1.3 塑件材料的力学、电气性能洞漳断钞派六噪傅恳羌妾
屈服强度 Mpa咛漾次幺牒凰蛤桴式慕鄂
7客峡糕箫钠覆桄珧傧卒盛
抗拉强度 Mpa朕仨蒈镉唳酎疟臣愠陷姜
37斤吴榘微嬲矽胃渐剪琪簧
断裂伸长率 %段鲣彭轺嘁玉超淼褫靖鲍
＞200宠坏铎摇春敞窬脶齄奴恃
抗弯强度 Mpa冢俘赖蔼溲幅哟贻孕答涔
67睨痱缶阢纽茂沃刁謦丈荸
弯曲弹性模量 Gpa矛梅岿薪稳筠辋瀛魄戛鳘
1.45惟焉蕤葡道槌舛哔鹣架噶
抗压强度 Mpa原啡蜒姿媳辜橼研倬篡陬
56颀欤蟠咻骀侗涪浚差跄移
冲击韧度 KJ/m2溏迷挟人膦飓饶傥隔磊蹂
无缺口酰串嵯谍厣滹瘰颈聋受鄣
78暝椅缮庞僧去跋乏尘弊商
有缺口陛焘墚枪删湃饣唳虼喊林
3.5～4.8苒斟皇髂雪狮鞠鄙峁獒妣
布氏硬度 HBS移埃箝诋渌郇怕季眙俐屿
8.65默投钣畏镣筢荚飞癌酒兮
电阻率 Ω·m散哉席斓颏捃赔环猊概呻
＞1014挥鲩菔匈剽氚圪力羧坜漓
击穿电阻 Kv/mm坻之缬陴鹊飒卦邮郛筚羼
30盐坦焦葆渤碡茔漪椒酒讪
介电常数 （106Hz）抄兄父徽淮桐荜伫苹笤单
2.02～2.6犒椭怪葜惑痦齑咆麻醮支
耐电弧性 s艘仟菇眶渍狈眯辁弈桩砍
125～185哏巡泸淝皲蹭靠锟隰嘀蝶
头吹狄嗅毛屠锕泼佞驶灼
1.1.4 塑件材料的化学性能讷冒云伦哇矗痪跤诵且慝
日光及气候影响粟员拷传箍染威慨濂童拍
不含稳定剂时表面迅速变色、发脆、若添加康氧化剂时会改善其抗大气老化性能胨颚涮男捕受绘伟穹俺谵
耐酸性喔鉴横氆诫半含运脊羰旁
60℃以下中等浓度的酸类无影响。强酸及高浓度氧化剂能引起破坏，对水和无机盐溶液稳定橇辫礻员毕坳闪嫉嗜召痦
耐碱性孚瞽董闲财恼穴妾仂冬戍
对碱类稳定力谏湖键坐铯堡珊潢箪桑
耐油性波宗瘩猖颧玖杆步脑阔剡
对多数油类稳定，能吸收少量的矿物油、植物油蹄糨廪不旰秸吾胜惺技澈
耐有机溶剂脱郭踟裳管胄擎镪濒胎掮
室温下不溶于有机溶剂。超过80℃能溶于苯、甲苯等芳香烃及氯化烃中，于溶剂长期接触不产生脆性 檄鲺瑰岑吕舨撩措智历礁
邵必隶馈疰终轮赁砰嘴轺
1.1.5 塑件材料的成形条件瞅伯腕逯麽嘛簇绡闾粹捺
注塑成型机类型耍锾抚耐环喇孵呢俊迟碲
螺杆式撕庞储九杓权砥肭曛镝铡
密度 g/cm3演罅饥熠炸忍蚂鞒蕹菩闯
0.90～0.91监排犴结鸵舱林螯阏丝满
计算收缩率 %嫔潞仉鄂窑恽蜉迕臾瓴与
1.0～2.5喊羰金赜伛陆柔縻龉撖砚
预热癌戋鳐匐蓖丹浇帷琴荷柳
温度 ℃兔窦蜀惭搴汉掌厩凯诋使
80～100槐胙远颞髟钊莰犹铞衷碎
时间 h裎疆直苠且胀钰突骥缠沸
1～2酸苊伍矫捷牌拢纯俅螈崩
料筒温度 ℃觉粑耋秆蚴熔帆蝣删假橄
后段 刃创栳邙筹辟础颌淦僳伸
160～180饴峋钟束霉崮床鲷嘱长趼
中段洞恨辚奖溲俅场脖率戳钳
180～200桑命跃咀连掎矮立蛉僖送
前段垌抄催觞帖罱捞继晶隶珲
200～220按家冬貌罂锓刃秆绌洪低
模具温度 ℃二膳迄戗宰阿拢芬狗忄淙
90～100锉糌缴抑悦心度叼坪皲禄
注塑压力 MPa授嗪妊蛆尢跋折邰滹懒羿
80～130激病鞋赃培秃胳鲇胰捍腓
成形时间 s衡鹋普嗒锄怯舶卖约选磙
注塑时间乓傺腼伥统脸跫桥庭宵涤
20～90租矿驹诚伐轺盒荽较魔吒
高压时间陇癸轫沪棘饺馊臣滤十郐
0～5缂徒墚闲谜到尴侩稃抬均
冷却时间陡蹬俯麝章咴修花缎窕途
20～90筌休违蹰噪瓢霰轻坳砾逑
总周期堠猢岔稍拆谜嶂颌瞍鳟槔
40～190坞硷碍帘弭契擅未群俊剿
螺杆转速 r/min偌镏诃阖鲠炕骶韩吧觊鲵
28歉麝临注绅桶枸辨过蠢鳝
后处理喘蕻惟堆痖戈资骓喙漏斥
方法于浈烟啸羝邓耗鳐罗疒偶
红外线灯或鼓风烘箱键伍胂峻鹑握腓锘倨涟烤
温度 ℃砬三恐颇裘骄靠咴偶砉鳋
140～145尻讵谍枪徽悻订舶朦遥哽
时间 h丧风肆镫岣戎锲待尘慕殪
4跎北瓴哨旧虐雍称箧庞媚
裆冼蹈苈摹挤捆魂贡婪缌
1.2 塑件的体积与重量妇护佝耍穴睁范鹤眄衔嚓
计算塑件的质量是为了选用注射机及确定型腔数。杷荷擢闭毯港锢腱貂医穷
1）计算塑件的体积：连泉燮积势搭硇拯杰讥睾
笸郇袒粳傩社小牒煤豺桶
隧阜鹇避梵窕椹度箱藻偎
及坷明闪辜氛关捐闭囹吕
峻踵糜边履凿监皙垢龊锘
红林夹岸挺捱激艴弧肯匣
连侄痉畛庇舢绗圾洁矽让
赍吭篾牟殍鼋椤眩俟枭蚺
勤镊儒裙杭私惩喈舂苴尕
2）计算塑件的重量：根据设计手册可查得聚丙烯（PP）的密度为=0.9㎏/dm，故塑件的重量为：颃枢悌憨酸膘藩淦椿玄後
渣俨料党捂湓轴酷悫山卮
1.3 塑件工艺分析及结构设计简睚漳诚冖厝坪捌瘼币鞋
若要将聚合物加工成具有一定功能用途的塑料制件，除了要选用合适的塑料材料外还必须考虑塑料制件的加工工艺性。影响成形件误差的主要原因是塑料收缩率的波动、模具使用的磨损、成形制品脱模后的收缩、模具制造及装配的误差。藿渚椎猹槊舶詹秦繁寇苍
为了便于脱模，并防止脱模后刮伤制品表面，要求有一定的脱模斜度，脱模斜度的大小取决于塑料的收缩率、制品的形状及厚度。制品上所有的角均采用圆角过渡，既安全又改善了熔体在型腔的流动性，有利于充型，避免出现熔合线。。婚彝槲馗叽芽刿疑戗郝淋
1.3.1 塑件成形方法：对椴飕涤媲灰艾蒜尕辞趴
热塑性塑料的成形方法主要有挤塑成形、注塑成形、压塑成形、浇注成形等。本塑件采用注塑成形方法。耪鲈踞许澶宛见僦刊韧戈
1.3.2 塑件的结构和尺寸精度及表面质量分析德铩连踌嫁尺坠笃忻闲踔
1）结构分析：烹趣貔义霰胰菏窘狐嬗干
从零件图上分析，该零件总体形状为长方形，在宽度方向的一侧有两个Φ10.5㎜的圆孔，在高度为15mm的圆锥凸台上有一直径为Φ4㎜的圆孔。因此，模具设计时必须注意设置侧向分型抽芯机构，该零件属于中等复杂程度。米耷慧捣傻涣酴洮苄挠楂
2）尺寸精度分析：睃村郜牮箪去逮徘苓溧闸
该零件的所有尺寸都未注公差尺寸，由表2-5常用材料塑件公差登记和选用（GB/T14486-1993），可选得聚丙烯PP的未注公差尺寸等级为MT5级，由以上分析可见，该零件的尺寸精度要求不高，对应的模具相关的零件的尺寸加工可以保证。弘飨玩膂壶惴闪鹃搬眯螟
3）表面质量分析：该零件的表面除要求没有缺陷、毛刺，内部不得有导电杂质外，没有特别的表面质量要求，故比较容易实现。藕噜期牛喀鸠莆仔馅缢呈
综上分析可以看出，注射时在工艺参数控制得较好的情况下，零件的成型要求可以得到保证。煳墁竺欺店癫渌揠珲碜夤
1.3.3 注塑成形塑件工艺结构设计：嗝妊痛悦臌尾槲飒梯茄吝
在注塑成形塑件设计过程中应该尽量避免凸凹台，然而本塑件侧壁上有凸台和圆孔，所以其成形模具中必须设计侧向抽芯结构。菜愚唪桶己勖半挡鹦甜洞
1）脱模斜度盎刺蔷河凛茌刮纛饲戒鲆
塑件在模具注塑成形过程中，塑料从熔融状态转变为固态状态将会产生一定量的尺寸收缩，从而使塑件紧紧的包围在模具型芯或型腔中的凸起部分，为此必须考虑塑件内外壁有足够的脱模斜度。查塑