基于AMI与正交试验的餐盘翘曲变形优化

针对塑料餐盘在注射成型过程中由于翘曲变形造成的中间凸起引起使用性能的缺陷,结合AMI注射成型分析软件和正交试验设计对餐盘的注射成型过程进行数值模拟,通过对试验结果数据的定量分析,系统分析了模具温度、熔体温度、注射速率、保压压力、保压时间、冷却时间等工艺参数对餐盘翘曲变形的影响规律和影响贡献率,从而得到最优的工艺参数组合,并模拟分析出最优工艺参数组合下的翘曲变形量。用数值模拟结果指导餐盘注射成型模具设计,并通过实际注射成型验证其明显改善了塑料餐盘的翘曲变形缺陷。     

计算机辅助工程技术在塑料注射成型中的应用

利用计算机辅助工程技术对塑料注射成型工艺及其模具结构设计进行了探讨。计算机辅助工程技术能够在模具设计阶段开展模拟工作,一旦发现问题,则会及时解决,同时也能运用计算机模拟并确定注射成型所需的工艺参数。通过选择塑料注射成型工艺参数,力图将工艺参数与模具结构紧密融合。最后,用实例验证了运用计算机辅助工程技术模拟注射成型工艺及模具结构设计的过程,达到了提高注射成型制品质量的目的。     

塑料注射成型流动过程仿真

本文通过对塑料注射成型流动、保压过程的分析,得到一组描述注射成型流动、保压过程的控制方程,采用有限元/有限差分混合法进行求解,实现注射成型流动、保压过程仿真;为优化工艺参数、提高制品质量提供了有效的手段。     

多方案填充内燃捣固镐外壳的流场分析

利用CAE技术建立ND-5型内燃捣固镐塑料外壳的注塑成型过程的物理和数学模型,分析注射成型过程中的流场,模拟分析了塑料件的多个注射成型填充过程,并分析各方案的充模特征,通过对比填充过程和缺陷,选取了最适合塑料件的注射成型方案。     

气辅注射成型工艺参数正交试验CAE模拟设定

介绍了气辅注射成型中的CAE分析方法;阐述了气辅制品缺陷与工艺参数的关系;运用正交试验方法对待定气辅成型工艺参数进行合理的实验设计,采用塑料成型过程模拟仿真软件MoldflowPlasticInsight5.0对气辅成型塑料周转箱制品进行FLOW-COOL-FLOW分析,代替传统试模方法,并对CAE后处理结果进行综合分析,得到一组优化的工艺参数组合。该组气辅成型工艺参数组合可作为实际生产中的气辅成型工艺参数设定值。     

塑料成型加工的计算机模拟技术*(Ⅰ)

介绍了塑料成型加工过程中计算机模拟技术的内涵和技术发展状况,阐述了塑料注射成型,气体辅助注射成型和反应注射成型等三种工艺的计算机模拟技术。     

高光无痕注射成型流动分析

以车载蓝牙外壳为例,运用Moldlow软件对其最佳浇口的位置进行分析,在此基础上对高光无痕注射成型过程中的流动填充进行了模拟,并以填充时间和填充结束时压力分布进行流动分析,提高了试模一次成功率,降低了高光无痕注射成型成本.     

小模数塑料内齿轮注塑模具设计

介绍了小模数塑料内齿轮的注射成型工艺特点,在参考Moldflow软件模拟结果的基础上确定了最佳的浇口位置,并对模具设计和制造过程中的关键问题进行讨论,设计了一套小模数塑料内齿轮注塑模具.注射成型试验表明,所设计的模具结构合理、运行顺畅,所注射成型的小模数塑料内齿轮质量良好、满足使用要求.     

金属粉末注射成型工艺

将现代塑料注射成型技术引入粉末冶金领域，不但扩大注射成型技术的应用，同时也推动粉末冶金工艺的发展。详细讨论金属粉末注射成型工艺及其应用，对其材料选择，产品与模具的设计、注射成型工艺过程及烧结工艺过程进行了系统的分析，并展望了该工艺中金属粉末、粘结剂、注射成型装备和工艺过程数值模拟软件等方面的发展趋势。     

鼠标外壳模外装饰贴膜技术工艺参数分析

以聚丙烯(PP)薄膜材料对鼠标外壳进行模外装饰(OMD)贴膜,采用有限元方法对该成型过程进行模拟仿真,获得了薄膜的厚度分布、应力分布及其在X,Y方向的变形分布。分析了不同工艺参数对鼠标外壳OMD贴膜成型的影响。贴膜工艺的最佳工艺参数为:初始压边力为300 N、加载温度为130℃、真空度为0.02 MPa、高压压强为0.15 MPa。     

电动工具外壳注塑模拟与成型方案优化

利用Moldflow/MPI技术对电动工具外壳进行注塑模拟分析,预测了成型过程中的填充情况,并对型腔压力分布、温度分布、锁模力大小和体积收缩率等进行计算分析,掌握了翘曲变形产生的原因。根据注塑模拟分析结果优化了浇口、冷却系统设计方案和成型工艺参数,使模具设计更趋合理。优化后的成型方案用于实际生产,缩短了试模周期。     

A Practical Verification of a Computer Simulation for Injection Molding Applied to Amorphous Thermoplastic Polyesters

A comparison has been made between the pressure drops arising during injection molding as predicted by a simulation software package named SIMPOL® and as measured during molding trials conducted to study the effects of molding variables. The theory used to design the software has been reviewed and the operation described. The comparison was made using amorphous thermoplastic polyesters, PET and PCTG. The molding conditions used for the simulated trials were the same as those used in practical molding trials. The molding trials were conducted using a mold fitted with a cavity transducer and a machine fitted with a hydraulic pressure sensor. The simulation shows qualitative agreement to the observations made in practice. The difference in pressure drop values are attributed to the software's dependence on crystalline PET physical properties for calculations and an overestimation of the frozen layer thickness by the simulation model. Overall the simulation has been shown to be a pragmatic tool for the production engineer working in the thermoplastic injection molding industry.     

聚合物熔体流变性能对气辅注塑工艺的影响

应用ＨｅｌｅＳｈａｗ物理模型和改进的Ｃｒｏｓ流变模型及有限元算法对５种聚丙烯的气辅注塑过程进行模拟,研究不同聚丙烯材料在充模速度相同的条件下的压力及锁模力变化规律。结果表明,气辅注塑在气体注射后与传统注塑有较大差异,所需压力、锁模力均比传统注塑有显著降低,且聚合物的熔体流动速率越小,气体注射后产生的压力降越大,表明在生产中应尽可能选用高熔体流动速率树脂以利于气辅注塑工艺。     

Moldflow在后盖注射模设计中的应用

以某移动空调后盖为例,针对注射成型过程中出现严重区边缺陷,运用专业模流分析软件Moldflow对后盖注塑件的注塑生产过程进行模拟分析,利用模拟结果优化模具结构,找到合理的注塑工艺参数,进而选定注塑机。     

A structure-oriented computer simulation of the injection molding of viscoelastic crystalline polymers part I: Model with fountain flow,packing, solidification

A realistic simulation of the injection molding process should be capable of describing moldability parameters, such as pressure drop in the delivery system and cavity and melt-front progression during cavity filling, as well as predicting the characteristics of the final product, such as residual stresses and crystallinity distributions. After a brief review of the existing models for the mathematical modeling of the injection molding process, a new model, that meets the above requirements, is proposed.     

Simulation and Experimental Investigations of Material Distribution in the Sandwich Injection Molding Process

In sandwich injection molding, two polymeric materials are sequentially injected into a mold to form a multilayer product with a skin and core structure. Different properties of these polymers and their distribution in the cavity greatly affect the applications of the moldings. In an ideal situation, the core material should be entirely encapsulated in the skin material. When the flow front of the core material overtakes that of the skin material, breakthrough occurs, resulting in a defective part. The focus of this study is to determine the effect of molding parameters on the skin/core material distribution. The commercial simulation package (Moldflow) has been extensively compared with experiments. Both simulated and measured results suggest that in order to obtain the optimum encapsulated skin/core structure in the sandwich injection molded parts, it is necessary to select a proper core volume fraction and suitable processing parameters. A good agreement between simulation and experimental results indicates that the Moldflow program can be used as a valuable tool for the prediction of melt-flow behavior during the sandwich injection process.     

保险杠顺序阀控制注塑工艺仿真分析技术研究

借助模流仿真分析技术在计算机上进行试模,并进一步对产品进行成型工艺窗口分析,确定各注塑参数的取值范围。研究表明,采用阀式浇注技术可从根本上消除或大幅降低熔接痕对制品的影响;借助模流仿真分析技术可以大大减少产品试模修模的次数,降低产品生产成本。     

The Numerical Simulation of the Crystallization Morphology Evolution of Semi-Crystalline Polymers in Injection Molding

In polymer processing, crystallization plays a major role in the structure development of polymer, and structure development has important influence on the final properties of the products. Crystallization simulation should be highly concerned with the accurate simulation of polymer processing. In this work, a general formulation system based on the nucleation and growth process of polymer crystallization was adopted to describe the crystallization morphology evolution, and the crystallization process under isothermal and non-isothermal conditions was simulated. The model was introduced in injection molding, and the simulation of morphology evolution of polymer in injection molding was implemented.     

汽车保险盒上盖注射成型的数值模拟

利用Moldflow软件对汽车保险盒上盖的注射成型过程进行了数值模拟.通过分析填充过程中各时间段熔体的流动情况及最终的填充时间和填充效果,得出了制品的最佳填充时间和保压时间;通过分析成型过程中型腔的温度变化,预测了制品的熔接痕和气穴的分布,以及缩水、翘曲变形等成型缺陷,并通过实际注射成型对模拟进行了验证.实验证明,模拟结果非常真实地表现了制品实际的成型过程,其对成型缺陷的预测也比较准确,证明了注射成型数值模拟结果的可靠性.