虚拟塑料注塑成型教学系统

塑料注射成型技术的发展与注射模具设计人员需求的增长十分迅速，模具设计人员学习必要的塑料成型基本原理是掌握注射模具设计方法的现实需要。该文在虚拟现实（VR）技术的基础上，结合基于三维模型的注塑成型FEA技术、面向对象的编程技术和OpenGL图形库，研究并实现了沉浸式、交互式的虚拟塑料注射成型教学仿真系统（VPIM），提出了立体成像算法，给出了模拟注射成型过程运动仿真的方法，借助VR外设及通过建立知识化、数字化、可视化、现实化的教学平台来提高设计人员的学习效率、学习兴趣及对问题理解的深入程度。     

基于Pro/ENGINEER的一模多腔模具设计

Pro/ENGINEER是美国参数技术公司基于单一数据库、参数化、特征、全相关及工程数据再利用等概念开发的CAD/CAM/CAE软件,它为模具设计与制造集成提供了优良的平台,也是目前国内比较流行的注射模设计软件.塑料注射成型模具对塑料的适应性比较广,成型的塑料制件内在和外观质量好,生产效率高,所以注射成型模具日益引起人们的重视.为了追求低成本、高效率的生产,注射模设计常常设计为一模多腔,使得一次注射可以成型多个塑件.     

手机盖的注塑成型分析

在注射成型过程中，塑料熔体在模具型腔内的流动和传热过程是非常复杂的物理现象。合理地利用注塑模CAE技术，工艺人员可在模具制造之前，就对模具设计方案进行分析和模拟，以此代替实际的物理试模，预测潜在的设计缺陷并进行修改。     

基于CAD/CAE的卡扣模具快速设计与优化

为提高塑料卡扣模具设计的速度,利用ImageWare对塑料卡扣进行点云数据处理、特征线网格划分和曲面重构;将重构的塑料卡扣模型导入UG,借助UG的曲面修复功能缝合不连续的曲面,并以STL格式保存;利用UG的Mold Wizards模具设计模块,根据已保存的STL格式卡扣模型建立模具装配模型,设计分型面,生成模具成型零件的三维实体模型;用Moldflow/MPI进行塑料卡扣注射成型分析.结果表明采用优化后的模具设计参数与实验结果基本吻合。     

塑料注射成型计算机辅助分析的前置处理软件

本文介绍用于塑料注射成型时流动模拟和冷却分析的处理软件的总体结构，主要功能，数据结构设计原理等。     

注塑成型CAE软件WP—Flow的开发

ＷＰ－Ｆｌｏｗ是一个集成化的塑料注射成型ＣＡＥ应用软件，它融合模具造型，网络自动划分，材料特性数据库，计算分析和模具与工艺条件优化一体，它运行于Ｗｉｎｄｏｗｓ环境，全部用面向对象的Ｃ＋＋语言开发。     

华塑HsCAE3D技术在塑料注射成形领域中的研发与应用

塑料注射成形在塑料加工行业中占有非常重要的地位.传统的塑料注射成形开发方法主要是尝试法,依据设计者有限的经验和比较简单的计算公式进行产品与模具设计,及其工艺开发.但是在生产实际中,注射成形塑料熔体的流动性能千差万别,制品和模具的结构千变万化,生产环境和工艺条件也各不相同,因此在开发过程中要进行反复试模与修模,并一再调整工艺参数,甚至必须从新设计方案开始,才能正式投产.     

基于WEB的《塑料成型工艺与模具设计》多媒体课件的设计

本文结合《塑料成型工艺与模具设计》课程的特点和教学难点说明了课件的设计思路及媒体制作工具的选择，介绍了课件的主要功能模块以及设计特点。     

面向ASP模式的塑料注射成型CAE系统

随着Internet和电子商务的迅猛发展,一种应用软件的新模式:ASP也逐渐凸现。文章构造了一个面向ASP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。     

基于虚拟现实的塑料注塑成型系统场景可视化

虚拟现实,作为一门新型技术,已成功地应用于工程、设计和制造业领域.该文针对塑料注塑成型复杂的设计、制造、加工过程,将虚拟现实技术应用到塑料注塑成型过程中,并利用Delaunay三角剖分技术结合立体显示技术,开发了一种实用的虚拟场景.在此场景中可实现注射系统的全部设计和制造过程,并结合面向对象的编程技术和OpenGL图形库,实现注射成型系统在虚拟现实场景中的动态可视化,从而能够预先感知注射系统在设计、制造过程中可能出现的问题,并加以解决,实践证明了其可行性.     

基于位置补偿技术的模具监视系统

针对模具制品射出成型过程中因制品滞留在模腔中造成的夹模问题,提出集数字图像采集与处理以及模式识别等技术的解决方案,实现在注塑行业成型模具的监视系统。运用自适应阈值分割算法进行图像处理,运用图像差影检测算法进行模式匹配比较分析,并利用基于搜索空间与相似度测量技术的位置补偿算法,通过自动位置补偿将采集到的图像进行矫正。结果表明,生产制品的品质合格品率由90%提高到99%,注塑成型机的使用率由75%提高到96%。     

基于位置补偿技术的模具监视系统

针对模具制品射出成型过程中因制品滞留在模腔中造成的夹模问题,提出集数字图像采集与处理以及模式识别等技术的解决方案,实现在注塑行业成型模具的监视系统。运用自适应阈值分割算法进行图像处理,运用图像差影检测算法进行模式匹配比较分析,并利用基于搜索空间与相似度测量技术的位置补偿算法,通过自动位置补偿将采集到的图像进行矫正。结果表明,生产制品的品质合格品率由90%提高到99%,注塑成型机的使用率由75%提高到96%。     

PSO-based back-propagation artificial neural network for product and mold cost estimation of plastic injection molding

To simplify complicated traditional cost estimation flow, this study emphasizes the cost estimation approach for plastic injection products and molds. It is expected designers and R&D specialists can consider the competitiveness of product cost in the early stage of product design to reduce product development time and cost resulting from repetitive modification. Therefore, the proposed cost estimation approach combines factor analysis (FA), particle swarm optimization (PSO) and artificial neural network with two back-propagation networks, called FAPSO-TBP. In addition, another artificial neural network estimation approach with a single back-propagation network, called FAPSO-SBP, is also established. To verify the proposed FAPSO-TBP approach, comparisons with the FAPSO-SBP and general back-propagation artificial neural network (GBP) are made. The computational results show the proposed FAPSO-TBP approach is very competitive for the product and mold cost estimation problems of plastic injection molding.     

Development of an injection molding tool for complex microfluidic geometries

This paper will track the design and results of an injection molding tool developed to manufacture microfluidic chips. The mold design and injection molding process was complicated by the presence of integrated capillary fluidic interconnects. We determined that design of the runner and gate system responsible for delivering molten plastic to the cavity had a significant impact on the quality of parts produced by the mold and the size of the process window. Numerical results confirm our findings that reducing gate lengths and increasing part thickness dramatically improved the filling profile and lowered injection pressures by 37%. Finally, the influence of gate location on part shrinkage is analyzed and discussed.     

A visual mold with variotherm system for weld line study in micro injection molding

In order to study the weld line developing process and its influence on mechanical properties in micro injection molding, a visual mold with variotherm system mold was designed and fabricated. In this mold, a visualization design and a rapid heating/cooling system were integrated, and specimens with different cross section shape and micro dimensions could be molded for weld line study. The building process for the visual and variotherm mold was presented and the experiments were executed. The specimens for weld line study of micro injection molding were produced applying different processing parameters. A problem of flash in molded specimens needs to be solved.     

基于CAE和DOE技术的薄壁塑件翘曲变形分析及优化

以某型号仪表显示器外壳为研究对象,采用CAE和DOE技术对其在注塑过程中出现的翘曲变形缺陷进行数值模拟试验,研究熔体温度、模具温度、保压压力和保压时间等成型工艺参数对翘曲变形的影响,并根据试验数据进行极差分析,进而对工艺参数进行优化,获得最佳工艺参数组合.该工艺参数组合可提高塑件注塑质量和生产效率,缩短试模周期,对薄壁塑件的生产实践具有参考意义.     

Micro-injection molding using a polymer coated mold

We applied an insulating polymer layer to the surface of mold cavity to injection-mold large plastic parts with a microsized thickness. Polyimide (PI) was coated on the mold wall using spray coating method. A thin light guide plate (LGP) was designed and fabricated via micro-injection molding. The polymeric coating layer could enhance the fluidity of polymer melt in the cavity during filling stage by minimizing the formation of the skin layer during injection molding. The surface roughness and pattern transfer rate of the LGPs were analyzed experimentally. In addition, numerical simulation was carried out to understand the insulation effect of the layer in the injection molding.

     

Injection molding and injection compression molding of three-beam grating of DVD pickup lens

The objective of this paper is to investigate the application of injection molding and injection compression molding processes to produce diffraction gratings. A mold was designed to produce a diffraction rating connected with the fixed bushing. The combined part was verified to have a good diffraction performance. Integrated grating eliminates the assembly cost and error. Photolithography was applied to make the mold insert. The Taguchi method and parametric analysis were applied to study the effects of molding parameters on grating quality. The design, fabrication of structured mold surfaces and the results of the replication by injection molding (IM) and injection compression molding (ICM) are presented and compared. The diffraction angle of ICM grating is more accurate than that of IM grating. Grating made by ICM has a much smaller warpage than that made by IM. The diffraction pattern shows that ICM is a better process than IM to replicate a diffraction grating.     

Spiral and conformal cooling in plastic injection molding

Designing cooling channels for the thermoplastic injection process is a very important step in mold design. A conformal cooling channel can significantly improve the efficiency and the quality of production in plastic injection molding. This paper introduces an approach to generate spiral channels for conformal cooling. The cooling channels designed by our algorithms has very simple connectivity and can achieve effective conformal cooling for the models with complex shapes. The axial curves of cooling channels are constructed on a free-form surface conformal to the mold surface. With the help of boundary-distance maps, algorithms are investigated to generate evenly distributed spiral curves on the surface. The cooling channels derived from these spiral curves are conformal to the plastic part and introduce nearly no reduction at the rate of coolant flow. Therefore, the channels are able to achieve uniform mold cooling. Moreover, by having simple connectivity, these spiral channels can be fabricated by copper duct bending instead of expensive selective laser sintering.