外文翻譯--塑料注射模具設(shè)計及其熱分析-模具設(shè)計-資料下載頁
2025-05-12 07:18本頁面
【導(dǎo)讀】計相類似，與畢業(yè)設(shè)計課題相關(guān)聯(lián)。達(dá)到了本科畢業(yè)外文翻譯?；谶@點，模腔的布局一般都是對稱的。面有很高的加工精度以防止注塑時泄露的發(fā)生。但是，這會使空氣被封閉在閉合模。腔內(nèi)從而導(dǎo)致短射或使零件不完整。冷卻系統(tǒng)是沿模腔長度方向在模具上打出的水平孔，只起冷卻作用。圖2顯示了在公模板上氣孔、水線以及模腔的布局。在這個設(shè)計中，脫模系統(tǒng)只有推桿固定板、澆口套和推板。模具的設(shè)計和制造完成后，試模注塑出來的翹曲試樣會存在很多缺陷。短射的解決可以通過在模腔的角落里銑出附加的氣孔來排出被困。同時，減小注射壓力可以減小噴濺的發(fā)生。在注塑的過程中，210℃。熔融的ABS通過母模上的澆口套直接注入模腔，經(jīng)過冷卻，制件就成型了。生產(chǎn)周期為35s，包括20s的冷卻時間。表2列出了ABS以及AISI1050碳鋼的性能。物質(zhì)的不均勻收縮可能產(chǎn)生熱應(yīng)力從而引起。灌漿階段就是在注射溫度下用融解的熱塑料注入模腔。態(tài)下的應(yīng)力分配情況可以通過觀察生成的二維曲進(jìn)行線分析。
【正文】 ue to uneven shrinkage that happened. However, the temperature differences after cooling for different nodes are small and the warpage effect is not very significant. It is important for a designer to design a mould that has less thermal residual stress effect with efficient cooling system. For the product analysis, from the steps being carried out to analyze the plastic injection product, the stress distribution on product at different load factor is observed in the two dimensional analysis. A critical point, Node 127, where the product experiences maximum tensile stress was selected for analysis. The plastic injection molding process is a cyclic process. There are four significant stages in the process. These stages are filling, packing, cooling and ejection. The plastic injection molding process begins with feeding the resin and the appropriate additives from the hopper to the heating/injection system of the injection plastic injection molding machine . This is the “filling stage” in which the mould cavity is filled with hot polymer melt at injection temperature. After the cavity is filled, in the “packing stage”, additional polymer melt is packed into the cavity at a higher pressure to pensate the expected shrinkage as the polymer solidifies. This is followed by “cooling stage” where the mould is cooled until the part is sufficiently rigid to be ejected. The last step is the “ejection stage” in which the mould is opened and the part is ejected, after which the mould is closed again to begin the next cycle . The design and manufacture of injection molded polymeric parts with desired properties is a costly process dominated by empiricism, including the repeated modification of actual tooling. Among the task of mould design, designing the mould specific supplementary geometry, usually on the core side, is quite plicated by the inclusion of projection and depression . From the load case versus stress curves at this point plotted in Fig. 23, it is clear that the product experiencing increased in tensile load until it reached the load factor of 23, which is 1150 N. This means that the product can withstand tensile load until 1150 N. Load higher than this value causes failure to the product. Based on Fig. 23, the failure is likely to occur at the region near to the fixed end of the product with maximum stress of 107 Pa. Conclusion The product stress analysis reveals very limited information since the product produced was for warpage testing purposes and had no relation with tensile loading analysis. In future, however, it is suggested that the product service condition should be determined so that further analysis may be carried out for other behaviors under various other loading. that affect warpage. The testing specimen was produced at low cost and involves only little finishing that is degating. The thermal analysis of plastic injection mould has provided an understanding of the effect of thermal residual stress on deformed shape of the specimen and the tensile stress analysis of product managed to predict the tensile load that the warpage testing specimen can withstand before experiencing failure.
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