【正文】 the forefront of Quan phenomena. (3) The use of CAD phase of the product model and stages of the use of CAE analysis model is not unified, so that the inevitable second modeling, CAD and CAE systems integration can not be achieved. 5 Moldflow39。s biggest advantage is that the model greatly shorten the preparation time, thus greatly reducing the burden on the user modeling, will take several hours or even days of the original modeling work reduced to a few minutes. Therefore, based on doublesided flow simulation software technology, although the advent of time, only a few years, but in the world but has a huge user base, get the majority of customers for their support and praise. But the doublesided flow of technology has the following deficiencies: (1) The twosided flow of technology does not fundamentally resolve the issue of a neutral face, they still can not describe some threedimensional features, such as the inertial effect can not describe gravity effect on the melt flow, which fail to predict jet phenomenon, melt cuttingedge Quanyong phenomena. (2) the upper and lower surfaces corresponding to the melt flow front there are differences. As the upper and lower surface of the grid can not be one correspondence, but the grid shape, orientation and size can not be pletely symmetrical, so how the upper and lower surfaces corresponding to the difference between the melt flow front control is within the scope permitted by Difficulties in the implementation of doublesided streaming technology. (3) melt is only along the upper and lower surface flows, in the thickness direction is not to make any treatment, lack of realism. 6 Moldflow39。而利用注塑模 CAE 技術(shù)設(shè)計模具則不然，由于在模具設(shè)計構(gòu)思階段，可利用注塑模 CAE 技術(shù)進(jìn)行流動過程模擬，使得通常只有在模具試模階段才能發(fā) 現(xiàn)的問題，如短射，熔接線或氣孔出現(xiàn)在外觀零件表面等問題得以避免。此分析技術(shù)發(fā)展 至今已相當(dāng)成熟穩(wěn)定，其優(yōu)點(diǎn)為分析速度快、效率高。 (2) 上、下對應(yīng)表面的熔體流動前沿存在差別。但是還沒有專門針對這些成型方法的模擬軟件，所以亟待開發(fā)。 （ 2）注塑成型全過程模擬 目前，注塑成型模擬軟件主要有填充、流動、保壓、冷卻、應(yīng)力應(yīng)變和翹曲分析等模塊，各模塊的開發(fā)是基于各自獨(dú)立的數(shù)學(xué)模型，這些模型在很大程度上進(jìn)行了簡化，忽略了相互之間的影響。 顯然， Fusion 技術(shù)的表面網(wǎng)格是基于中性面的，仍無法解決中性面的根本問題，所以雙面流技術(shù)所應(yīng)用的原理和方法與中面流所應(yīng)用的沒有本質(zhì)上的差別，所不同的是雙面流采用了一系列相關(guān)的算法，將沿中面流動的單股熔體演變?yōu)檠厣?、下表面協(xié)調(diào)流動的雙股流。 一般情況下，最常用 MPI，主要用來對注塑過程進(jìn)行模擬，從而得到最佳的澆 口數(shù)量與位置，合理的流道系統(tǒng)與冷卻系統(tǒng)，并對型腔尺寸、澆口尺寸、流道尺寸和冷卻系統(tǒng)尺寸進(jìn)行優(yōu)化，并且還可對注塑工藝參數(shù)進(jìn)行優(yōu)化。 CAE 技術(shù)的出現(xiàn)，為注塑模設(shè)計提供了可靠的保證，它的應(yīng)用是 模具設(shè)計史上的一次重大變革。s range of products, the pany issued since 1976, the world39。s 3D analysis techniques These two techniques have overlooked the thickness direction of the physical quantity, only twodimensional simulation, and therefore results are not very precise. Moldflow Corporation39。同時幫助設(shè)計人員完成諸如流道系統(tǒng)的平衡設(shè)計，排氣槽的設(shè)置，合理確定注塑工藝參數(shù)等工作，這樣使得通常在必須反復(fù)試模修改而確定的模具結(jié)構(gòu)參數(shù)和工藝參數(shù)在模具設(shè)計構(gòu)思階段得以確定，縮短了模具設(shè)計制造周期、提高了模具設(shè)計質(zhì)量。其模擬過程如圖 3 所示。由于上、下表面的網(wǎng)格無法一一對應(yīng)，而且網(wǎng)格形狀、方位與大小也不可能完全對稱，所以如何將上、下對應(yīng)表面的熔體流動前沿的差別控制在所允許的范圍內(nèi)是實(shí)施雙面流技術(shù)的難點(diǎn)。 （ 5）注塑模 CAD/CAE/CAM的集成化與網(wǎng)絡(luò)化 目前的商品化注塑模 CAE 軟件與 CAD、 CAM 軟件之間的數(shù)據(jù)傳遞 主要依靠文件的轉(zhuǎn)換，這容易造成數(shù)據(jù)的丟失和錯誤。目前的商品化模擬軟件模型沒有完全考慮物理量在厚度方向上的影響，為了進(jìn)一步提高軟件的分析精度和使用范圍，必須進(jìn)一步完善目前的數(shù)學(xué)模型和算法。在流動過程中，上、下兩表面的塑料熔體同時并且協(xié)調(diào)地流動，其 模擬過程如圖 4 所示。 MoldFlow 軟件包括三部分： MoldFlow Plastics Advisers（產(chǎn)品優(yōu)化顧問， MPA）、 MoldFlow Plastics Insisht（注塑成型模擬分析， MPI）和 MoldFlow Plastics Xpert（注塑成型過程控制專家，MPX）。進(jìn)入 90 年代后開展了流動、保壓、冷卻和應(yīng)力分析等注塑工藝全過程的集成化研究。 and domestic in the Eighth FiveYear period began research in this area, and now Huazhong University of Technology HSCAE software and Zhengzhou University, Z Mold software in China in the leading position. Moldflow software is specialized in injection molding CAE software and consulting for Moldflow39。s 3D (3D) analysis technology uses a true threedimensional solid model flow analysis techniques, through rigorous theoretical derivation and repeated verification, the inertial effect, nonisothermal flow, taking into account factors such as finite element analysis, the melt thickness direction of the physical quantity changes will no longer be ignored, can be a more prehensive description of the process of filling flow phenomena, so that results of the analysis more realistic conditions, applicable to all plastic products. Its threedimensional grid is from the fournode tetrahedron unit. And using the new 3D stereoscopic display technology, can quickly model clearly shows that internal and external flow field, temperature field, stress field and velocity field such as analysis results. For the abovementioned results of the analysis can also be used such as bit lines or equipotential surface display, so that physical models and external changes in the variables show more clearly the case, Moldfiow also offers animation capabilities, t