One of the important quality issues for injection moulded parts is weld lines. The injection moulding simulation has been greatly developed over a couple of decades. However, current simulation packages are incompetent of detection and evaluation of weld lines location and properties. In this paper, a detection model of weld lines location is presented, which is based on the characteristics of the initial meeting node. A quantitative evaluation model using the artificial neural network approach is also established in this paper. For identifying the input of the network, the affecting factors of weld line properties are discussed in detail-the orientation coefficient of the material, the meeting angle, and the melt mobility history coefficient. Comparison with experimental results shows that these presented models are capable of predicting weld line location and properties for engineering design.

Nowadays, moulders and customers pay increasing attention to parts warpage, which becomes a determining quality criterion for parts acceptance. The accurate prediction of warpage of injection-moulded parts is an important and challenging task for numerical simulation of injection moulding. In this paper, the numerical analysis of warpage in injection-moulded parts was carried out in consideration of the residual stresses produced during both the packing and the cooling stages. For residual stress analysis, a thermorheologically simple viscoelastic material model was introduced to consider the stress relaxation effect and to describe the mechanical behaviour according to the temperature change. The deformation of injection-moulded parts induced by the residual stress was calculated on the basis of the theory of shells, represented as an assembly of at elements formed by combining the constant strain and the discrete Kirchhoff triangular element. Experimental research on a at plate was also performed to study the effect of mould structure and processing parameters on warpage. The simulation results were also compared with the experimental data for veri cation of the developed programme. It was found that the predictions were in agreement with experimental data, especially in qualitative analysis.

为了修复使用STL文件时产生的一些错误，首先根据错误的特点进行分类，以边的检查作为STL文件错误检查的基础，通过建立错误面片、边和顶点数组来实现错误记录，采用错误描述图来构造错误元素的拓扑关系。考虑到不同错误的特点,建立了合并顶点→空洞修复→裂缝修复→删除多余→重叠修复→错误刷新的基本修复步骤。开发了专用的STL文件修复工具，并通过实例验证了该算法。

Cooling system design in the TV panel pressing operation is of great importance because it significantly affects productivity and the quality of the final part. It would thus be very helpful for mold designers to be able to use a computer aided design tool in determining locations and dimensions of cooling system and process conditions to achieve rapid, uniform and even cooling. For this, a computer simulation has been developed for three-dimensional mold heat transfer of the TV panel pressing process. In the simulation, mold heat transfer is considered as cyclic-steady, three-dimensional conduction; heat transfer within the glass melt region is treated as transient, one-dimensional conduction; heat exchange between the cooling system surface and coolant is treated as steady, as is heat exchange with the ambient air and mold exterior surface. Numerical implementation includes the application of a hybrid scheme consisting of a three-dimensional, boundary element method for the mold region and a finite-difference method with a variable mesh for the melt region. These two analyses are iteratively coupled so as to match the temperature and heat flux at the mold–melt interface. As compared with the experimental data, the numerical simulation developed here is c omputationally efficient and sufficiently accurate.

在详细分析现有注射成型CAE软件尚属专家型、被动式的分析工具的基础上，阐述了CAE系统智能化的必要性，构造了智能型注射成型模拟系统的体系结构，讨论了其中的多知识表达及处理方式并通过实例介绍了所构造系统的应用。

This residual stress accumulated during the postfilling and cooling stages will lead to warpage of parts after demolding. Based on the principle of viscoelastic mechanics, the linear isothermo-viscoelastic constitutive equation is established. Then this constitutive equation is deduced according to the analysis of the thermorheologically simple material for given boundary conditions of the temperature field. Considering the restraint conditions of mould and the characteristics of injection moulding at the post-filling stage, some reasonable hypotheses have been assumed and hence the stress model is constructed. This mathematical model is solved using the finite difference method. The results can help predict the warpage of plastic products.

阐述了塑料材料流变参数在注射成型模拟中的重要意义，简要介绍了流变数据的测试方法，采用基因遣传算法实现流变参数的拟合。并通过实例验证了所开发的拟合算法的正确性及流变参数对CAE分析结果的影响。

基于相似理论建立了玻壳模具冷却器的流动传热模型。流动采用固定平行平板间的间隙流动模型，换热采用赛特和塔特的换热模型，并通过进一步推导获得了最终计算方案。最后通过程序实现计算出冷却水的流量场、速度场、换热系数场等的分布，为玻壳模具温度场的数值模拟提供了必需的边界条件.

随着Internet和电子商务的迅猛发展，一种应用软件的新模式——应用服务提供商（ASP），也逐渐凸现。本文构造了一个面向ASP的基于Web的远程塑料注射成型CAE系统，详细介绍了系统的构造方法和关键技术。

Computer simulation packages have had success in predicting filling behavior in extremely complicated geometries. However, most of the current numerical implementation is based on a hybrid finite-element/finitedifference solution with the middle-plane model. This kind of model leads to some inconvenience in applications. Instead of using the middle-plane as the datum plane, the surfaces of the cavity are used as datum planes in this article. Additional boundary conditions in the gapwise direction are employed to keep the flows in the surfaces at the same section coordinative. Comparisons with experimental results obtained with an instrumented test mold and C-Mold results show good agreement in terms of pressure traces and melt-front advancement. It is demonstrated that the present formulation is well suited to handle cavities generated directly by current CAD systems.