【正文】 as determined based on the analysis of the structure and forming technology of the design for the mold parts,such as molding parts,demoulding mechanism,and so the same time throughout the design process, through the puter aided design CAD and PROE on how to use PROE simulating the filling process of plastic melts in the cavity of injection moulds. The analysis on the analog result can help effectively modify the design scheme and prevent the problems that may occur in the production And in the design of structure,The key points in designing the side corepulling mechanism with gears and rack were stated in detail. The mould is pact in structure and effective in operation.This text mainly narrates the design of injection mould for a safety helmet, including the selection of product material and its property analysis, the selection of injection machine, the design of feed system, shaping part, cooling system and core pulling, etc. Besides this, it also covers the CAD/CAM for the mold cavity, and generating GCode instructions for CNC machine by the advanced software. In this text, the author emphasizes the use of modern puter assisted design and manufacturing technology, and apply some famous software, such as Pro/E, CAXA, to design. Through this, it not only guarantees the performance, but also raises working efficiency greatly and shortens the production cycle.Key Words: safety helmet。 CAD/CAM. ；Pro/E３目錄1 塑料成型制品工藝性 塑料制品的設(shè)計(jì)依據(jù)及選材依據(jù)......................................4 塑件的尺寸和精度..................................................5 塑件體積與質(zhì)量估算................................................52 注塑機(jī)的選用及校核....................................................6 注塑機(jī)類型的選擇...................................................6 注塑機(jī)有關(guān)工藝性參數(shù)的校核.........................................63 澆注系統(tǒng)設(shè)計(jì)..........................................................9 按制品特點(diǎn)選擇澆注形式.............................................9 交口套是設(shè)計(jì).......................................................94 成型零件的設(shè)計(jì).......................................................11 型腔數(shù)是確定.....................................................11 成型零件的結(jié)構(gòu)設(shè)計(jì)...............................................11 分型面的確定.....................................................11 成型零件工作尺寸的設(shè)計(jì)...........................................115 合模導(dǎo)向機(jī)構(gòu)的設(shè)計(jì)...................................................14 導(dǎo)柱直徑的計(jì)算及選用.............................................15 導(dǎo)套的設(shè)計(jì).......................................................156 脫模機(jī)構(gòu)的設(shè)計(jì).......................................................16 結(jié)構(gòu)形式設(shè)計(jì).....................................................16 頂桿布置形式.....................................................16 脫模力的計(jì)算.....................................................17 推桿長(zhǎng)度的計(jì)算...................................................17 推板厚度計(jì)算.....................................................17 推桿強(qiáng)度計(jì)算與應(yīng)力校核...........................................177 冷卻系統(tǒng).............................................................19 冷卻通道的理論計(jì)算...............................................198 側(cè)向分型與抽芯機(jī)構(gòu)設(shè)計(jì)...............................................21 側(cè)向分型與抽芯機(jī)構(gòu)的選用.........................................21 抽芯距的計(jì)算.....................................................21 抽芯機(jī)構(gòu)各尺寸的確定.............................................21 抽芯力及抽芯所需開模力的計(jì)算.....................................22 型芯機(jī)構(gòu)布置設(shè)計(jì)及其它部件選材...................................229 模架選擇.............................................................23基于 Pro/E 的安全帽注塑模具設(shè)計(jì)及型腔仿真加工４結(jié)論.....................................................................24參考文獻(xiàn)...............................................................25鳴謝...................................................................26塑料成型制品工藝性對(duì)塑件進(jìn)行測(cè)繪。測(cè)繪好后用 Pro／E 軟件進(jìn)行三維造型。造型結(jié)束后進(jìn)行模具設(shè)計(jì)。要確保塑件及澆注系統(tǒng)所需的注射量不超過注射機(jī)最大容量的 80％。澆注系統(tǒng)分為主流道、澆口、冷料穴等。另外由于主流道與高溫高壓的熔融塑料接觸所以外面要加個(gè)澆口套。澆口主要有兩個(gè)作用，一是起控制作用，二是壓力撤銷后封鎖型腔，不產(chǎn)生倒流。本模具采用間隙排氣。下面是推出機(jī)構(gòu)的設(shè)計(jì)。本模具設(shè)計(jì)采用注射機(jī)的開模動(dòng)作驅(qū)動(dòng)模具上的推出機(jī)構(gòu)，實(shí)現(xiàn)塑件的自動(dòng)脫模。本模具設(shè)計(jì)采用塑件留在動(dòng)模，要保證塑件不應(yīng)推出變形或損壞，還要保證塑件的良好外觀和結(jié)構(gòu)可靠。經(jīng)過+50℃～10℃，高低溫及淋水處理后，沖擊吸收性能，耐穿透性能，剛性強(qiáng)度，電絕緣性能，均能達(dá)到或超過安全使用要求。加寬帽沿加強(qiáng)肋，使帽殼整體更堅(jiān)固。ABS（Acrylonitrile/butadiene/styrene polymer）即為在聚苯乙烯分子中導(dǎo)入了丙烯腈、丁二烯等異種單體后成為改性共聚物，也可稱為改性聚苯乙烯，具有比聚苯乙烯優(yōu)越的使用性能和工藝特性。所以成