应用Taguchi实验设计法最小化ABS注塑制品翘曲变形量

运用Taguchi DOE技术研究了工艺参数对丙烯腈-丁二烯-苯乙烯共聚物(ABS)注塑制品翘曲变形的影响,并获得优化的工艺参数以使制品的翘曲变形量最小。文中以碱性蓄电池盖为例,利用L9(34)正交矩阵进行实验,并采用标准变量分析法(ANOVA)对熔体温度、注射时间、冷却时间、保压压力等工艺参数对制品翘曲变形的影响程度进行了研究,结果表明,在所选工艺参数中,保压压力和熔体温度对翘曲变形的影响程度最大。     

基于正交试验的端盖注塑件优化

以端盖注塑件为例,运用正交试验结合CAE模拟技术,研究定模温度、动模温度、熔体温度、螺杆速度及位置、保压时间和压力对塑件翘曲变形的影响规律,优选出对翘曲变形量影响最小的工艺参数组合。在此基础上,利用复合形法对影响翘曲变形量最大的3个因素（定模温度、保压时间、保压压力）进行优化设计,从而进一步减小塑件翘曲变形量。     

面向翘曲变形的注塑模具浇口位置优化研究

在探讨浇口位置对翘曲变形影响的基础上,以翘曲变形量为优化目标,以表征浇口位置的节点为设计变量,用模拟退火法求解优化模型,将数值模拟和优化技术相结合,对注塑模浇口位置优化进行了研究.实例证明了该方法可用于指导模具浇口位置的优化设计.     

Warpage of injection-molded thermoplastics parts: Numerical simulation and experimental validation

A mathematical model and the integrated simulation program for predicting part warpage, which arises during injection molding of thermoplastic polymers, were developed. To build the model, the finite element method (FEM) was used and the theory of shells, represented as an assembly of flat elements formed by combining the constant strain triangular element and the discrete Kirchhoff triangular element, was applied. This shell theory is well suited for thin injection molded products of complex shape. Furthermore, in this work, experimental research on flat plates was performed to study the effect of the plastic material, the mold structure, and certain key processing parameters on warpage. The investigated processing parameters include injection pressure, packing pressure, injection time, packing time, cooling time, and melting temperature. Different examples were presented to examine the developed simulation software, and results predicted from the simulation program were verified in the above experiments and showed reasonable accuracy compared with experiment data.     

工艺参数对气辅注射制品翘曲的影响

基于气体辅助注射过程的数值模拟,利用Taguchi试验方法设计了L18(37)试验矩阵,采用标准方差分析方法,分析了GAIM工艺参数对制品翘曲的影响。研究表明:在所选择的工艺参数中,对翘曲影响权重依次为气体保压时间、熔体温度、预注射量、延迟时间、气体压力、注射时间和模具温度。此外,采用单因素法研究气体控制参数对制品翘曲的影响。结果表明:气体保压时间增加10 s,制品翘曲量减小36.9%;提高气体压力和增加延迟时间,制品翘曲量减小。     

线槽注射成型工艺参数优化设计

结合正交试验设计和数值模拟,选择模具温度、熔体温度、注射时间、保压压力和保压时间等5个主要工艺参数为设计变量,分别以最小体积收缩率和最小翘曲变形为目标,进行了线槽注射成型工艺参数的单目标优化设计。再利用加权综合评分法,对线槽注射成型工艺参数进行多目标优化设计,获得了兼顾体积收缩率和翘曲变形的工艺参数组合。     

Taguchi试验设计在注射成型工艺参数优化中的应用

采用Taguchi正交试验设计方法,结合有限元分析软件研究工艺参数对注射制品翘曲变形量的影响,获得最优的工艺参数使制品的翘曲变形量最小,以塑料齿轮为研究对象,采用L27(313)正交表进行试验,对试验结果进行级差和方差分析,研究各个参数及参数之间的交互作用对制品翘曲变形量的影响程度,研究发现,填充时间、熔体温度和保压压力的变化对注射制品的翘曲变形量有显著影响。     

基于MPI注塑制品的翘曲变形分析及优化

翘曲变形是注塑制品常见的质量缺陷,阐述了制件翘曲变形的基本理论模型,介绍了翘曲分析流程,以鼠标下盖为例,运用MPI对其进行翘曲变形分析,同时通过优化工艺参数,以达到降低制品的翘曲量的目的,提高产品的成型质量,说明了MPI在注塑模具优化设计中的可靠性与实用性。     

基于Moldflow的汽车水箱盖注射成型工艺参数优化设计

利用Moldflow软件对汽车水箱盖成型过程进行数值分析,以降低塑件翘曲量为目标,利用正交试验法分析主要成型工艺参数对翘曲变形的影响规律,获得最佳工艺参数组合。研究结果表明:工艺参数对翘曲变形影响程度从大到小依次为保压压力、保压时间、熔体温度、冷却时间、模具温度、注射时间,参数优化后的塑件最大翘曲量为1.148 mm。     

保压工艺条件对塑件翘曲变形影响的研究

保压过程是注射成型一个非常重要的阶段,保压控制是否合理直接影响到塑件的成型质量。文章以手机电池壳为例,采用CAE数值方法实现了对保压过程的数值模拟仿真,研究了保压压力、保压时间及保压方式对塑件翘曲变形的影响,为优化塑件的成型质量提供理论根据,也充分表明了CAE数值模拟的方法在注射成型应用中的可靠性和实用性。     

基于CAE的塑件翘曲变形分析与工艺参数优化

在分析翘曲变形理论的基础上,利用正交试验方法设计了L27实验矩阵对塑件注射成型过程进行模拟研究,分析了模具温度、熔体温度、注射速率、保压压力、冷却时间、保压时间等工艺因素对塑件翘曲变形的影响,得出了最优化的工艺参数设置,并分析了各单一因素对翘曲和收缩率的影响趋势及其原因。研究表明:所选择的工艺参数对塑件不同方向上的翘曲变形有着不同程度的影响,优化的工艺参数组合可以使塑件翘曲变形达到最小,从而提高塑件质量。     

基于Moldflow和UDE的打印机上盖翘曲变形工艺参数优化

基于Moldflow和均匀试验设计(UDE)方法,对某打印机上盖进行"冷却+流动+翘曲"模拟分析,以打印机上盖的翘曲变形量为试验指标,模具温度、熔体温度、保压压力、保压时间和注射时间为设计变量,建立了翘曲变形回归方程优化工艺参数。试验表明,通过UDE方法,有效减少了多因素多水平试验次数,并获得了最佳工艺参数组合,通过SPSS19.0统计软件实现回归分析,得出各个设计变量对试验指标的影响程度,并将因素按重要性进行了排序。     

基于稳健设计的电器壳体注塑成型工艺参数优化

将Taguchi稳健设计和CAE模拟技术相结合,应用于注塑工艺参数的优化。以某电器壳体的注塑成型为例,以减小制品的翘曲变形为试验目标,研究模具温度、熔体温度、注射时间、保压压力及浇口位置对注塑件翘曲变形的影响规律,运用变量分析,确定工艺参数对翘曲变形的影响度。     

应用CAE技术对超长装饰条进行翘曲变形研究

采用CAE模拟技术,以超长装饰条为研究对象,应用有限元方法研究了温度场、压力场对注塑件残余应力及翘曲变形的影响。对影响超长塑件翘曲变形的因素(如模具温度、熔体温度、注射速率、保压压力等)进行分析,提出翘曲产生的原因及相应的改进措施。结果表明,翘曲变形的原因,主要是流道设计不合理,造成了塑料收缩不均匀和分子取向的不一致引起;其次是在充模过程中温度不均,造成冷却不一致而引起装饰条的翘曲变形。     

基于Kriging模型的等速万向节滑套冷精整工艺的优化

针对车用等速万向节滑套在实际冷精整后杯壁端部出现不平整的问题,基于Deform有限元分析软件,提出Kriging代理模型与粒子群算法相结合的方法,以杯壁高度差为优化目标,使用拉丁超立方抽样法对预成形件尺寸参数进行抽样、完成实验设计,通过数值模拟得到仿真结果,并拟合成相应的Kriging模型。采用MATLAB将Kriging模型与粒子群算法相结合,对因素进行全局寻优,得到最小杯壁高度差的预成形件尺寸。产品试制后,杯壁高度差由原来工艺的12 mm缩小为3 mm,验证了此优化方法的实用性和正确性,提高了锻件的材料利用率。     

基于MPI的简状塑件注射成型模拟分析

针应用MPI软件对薄壁筒状件水杯的注射过程中的冷却、流动、翘曲进行模拟。分析了填充时间、体积收缩率、翘曲变形等情况,通过优化保压压力、保压时间以改进翘曲变形量。其分析结果对模具优化设计具有良好的指导意义。     

超长薄壁塑件翘曲分析和工艺优化

采用有限元方法研究了温度场、压力场对注塑件残余应力及翘曲变形的影响，重点讨论注塑件的温度场、压力场的计算，以及热塑性小变形理论下的注塑件翘曲变形计算。对影响薄壳塑件翘曲变形的因素（如模具温度、熔体温度、注射速率、保压压力等）进行分析，提出翘曲产生的原因及相应的改进措施。     

Research study demonstrates computer simulation can predict warpage and assist in its elimination

Programs for predicting warpage in injection molded parts are relatively new. Commercial software for simulating the flow and cooling stages of injection molding have steadily gained acceptance; however, warpage software is not yet as readily accepted. This study focused on gaining an understanding of the predictive capabilities of the warpage software. The following aspects of this study were unique. (1) Quantitative results were found using a statistically designed set of experiments. (2) Comparisons between experimental and simulation results were made with parts produced in a well-instrumented and controlled injection molding machine. (3) The experimental parts were accurately measured on a coordinate measuring machine with a non-contact laser probe. (4) The effect of part geometry on warpage was investigated.     

The die turning injection (DTI) process for the fabrication of hollow parts

The die turning injection (DTI) process, which can fabricate hollow plastic parts with a complex geometry, is proposed in this study. DTI is a new technology, which is accomplished in three steps: (1) the primary injection step, (2) the die turns, and (3) the secondary injection step. Two separate halves of the part are injection molded during the primary injection. The die rotates to align the two halves for the secondary injection. The secondary injection along the aligned surfaces joins the two halves into the final hollow part. The proposed DTI technology provides several advantages. It has the ability to form hollow parts with high dimensional accuracy, the equipment requires a small working space and the machine control is fairly simple. To verify the feasibility of DTI process, industrial trials were performed to manufacture a hollow nozzle part for a washing machine. To optimize the process, a finite element (FE) analysis was performed using the commercial code, Autodesk Moldflow Insight. To design the hot runner system for the primary injection step, two types of hot runner systems, a V-shaped and a T-shaped runner, were investigated. The critical parameter that was measured in these two runner designs was the amount of warpage. An FE analysis for the secondary injection step was also performed to analyze the flow characteristic at the aligned surfaces of the two separate hollow halves. The cooling channel was also designed to cool the mold and control the uniformity of injection temperature. With appropriate control of the injection conditions, a hollow nozzle part having excellent dimensional accuracy was successfully manufactured using the proposed DTI process.     

U盘上盖的翘曲变形分析与工艺参数优化

以U盘上盖的注塑成型为实例,运用Taguchi试验设计法,结合信噪比(S/N)和变量分析方法(ANOVA),以减少塑件的翘曲量为目的,研究熔体温度、模具温度、保压压力和保压时间等工艺参数对塑件翘曲的影响,分析各工艺参数的影响程度,并优化成型工艺。结果表明:保压压力、熔体温度对塑件翘曲变形影响最大,优化后的塑件翘曲量降低了约16%。