Moldflow软件对轿车水箱盖注射成型模具温度的优化

用Moldflow软件优化轿车水箱盖注射成型的模具温度。结果表明：模具温度在175 ℃时，胶料充模时间短，充模结束时的体积固化率小，充模后35 s时的体积固化率大。Moldflow软件可以优化橡胶制品的注射成型工艺，缩短工艺和模具设计周期，提高生产效率和产品质量。     

接插件精密注射成型工艺参数的优化研究

以精密注射成型聚酰胺66(PA66)/玻璃纤维(GF)接插件为例,采用正交试验和CAE模拟相结合的方法,对影响精密注塑制件收缩率的主要工艺参数进行优化,得到最佳工艺参数组合,并根据PA66/GF的P-V-T曲线,对注射成型的保压阶段进行优化设计,进一步改善了制件的成型收缩率,有效解决实际生产中靠经验确定参数所带来的产品质量不稳定的问题,提高了生产效率和制件质量.     

1.5MW风机叶片VARI工艺模拟分析及验证

本文对采用真空辅助成型工艺(VARI)制造的1.5MW风机叶片的流道设计进行模拟分析。考察了不同注射方式、不同导胶管间距的充模时间,分析了树脂流动形态、模腔内压力分布以及溢料口位置,优化得到了风机叶片根部的最佳注射方案。在此基础上模拟整机充模成型,得到最佳流道设计方案为根部布置间距为487mm的两条管道,沿着叶片长度方向布置三条注射流道,注射口数量为13个,两端抽气,溢料口数量为14个。将模拟结果应用于实际叶片成型工艺中,实际充模时间为3.63h,与模拟结果相比误差为0.38h。     

PA66齿轮注射成型仿真与实验分析

本文选用汽车车窗升降器用尼龙66(PA66)精密塑料齿轮为研究对象,阐述了齿轮的建模过程。采用Moldflow6.1软件,分析精密塑料齿轮的填充过程,结合田口正交实验设计方法,优化成型工艺方法,改进成型工艺参数,并对PA66齿轮注塑成型进行实验研究。结果表明,该方法可以为PA66齿轮注塑成型提供理论和技术支持。     

PA成型收缩率与注射工艺条件的关系

分析了注塑制品的收缩机理及收缩过程，并讨论了聚酰胺（PA）注射成型过程中模腔平均压力、熔体温度、模温、充模速率、成型时间等工艺条件对其收缩率的影响及制品后收缩率的因素，给出了减小制品收缩率，提高制品尺寸稳定性的方法。     

PA成型收缩率与注射工艺条件的关系

分析了注塑制品的收缩机理及收缩过程，并讨论了聚酰胺（PA）注射成型过程中模腔平均压力、熔体温度、模温、充模速率、成型时间等工艺条件对其收缩率的影响及制品后收缩率的因素，给出了减小制品收缩率，提高制品尺寸稳定性的方法。     

引擎盖VARTM成型充模流动模拟及优化

利用RTM-worx仿真模拟软件对引擎盖模型真空辅助树脂传递模塑(VARTM)成型工艺过程进行充模流动模拟,根据引擎盖模型的充模流动模拟结果,确定最终注射方案,并与引擎盖模型的VARTM成型工艺过程相比较。试验结果表明,VARTM成型过程与充模流动结果吻合较好,RTM-worx仿真模拟软件能够有效地对引擎盖模型进行充模流动模拟及优化。     

反应注射成型充模参数的选择

本文在分析聚氨酯反应注射成型反应动力学基本方程的基础上，对影响选择充模过程的主要因素进行了分析，并得出聚氨酯反应注射成型流动阶段充模区域图。     

玻璃纤维增强PA66制品翘曲变形的研究

针对玻璃纤维增强尼龙66（PA66／GF）注射成型制品存在的翘曲变形缺陷,运用Moldflow MPI软件对PA66／GF进行了注射成型模拟分析。结果表明,GF的取向是影响PA66／GF注射成型制品翘曲变形的主要原因;增加制品厚度或增设浇口均可有效减小制品的翘曲变形.     

中心浇口圆盘模腔正弦脉动充模分析

聚合物动态注射成型通过螺杆的轴向振动实现熔体脉动充模。利用Tanner本构模型建立了中心浇口圆盘模腔正弦脉动充模过程的数学模型,分析了振动参数对注射压力及熔体输送功率的影响。当充模过程的平均注射速率不变时,在一定频率与振幅范围内,模腔入口处的压力随振动源振幅(频率)的增大而增大,但其平均值降低;充模过程中输送熔体所需要的功率降低。     

Moldflow软件在无绳电话机面板模具设计中的应用

在无绳电话机面板模具设计中,应用Moldflow软件分析了不同的浇口数量、位置及相应的保压压力、保压时间对制品的充模压力、熔接痕分布、翘曲变形量和缩痕缺陷等的影响.通过优化浇口数量、位置并辅助适宜的保压压力和保压时间,减少了注塑缺陷和制品变形,这对模具设计及注塑过程工艺参教的设定均有一定的实际意义.实践表明,Moldflow的分析结果与实际生产中通过试模所得到的方案非常相近,说明了Moldflow分析结果在塑料模具优化设计中具有很好的可靠性.     

三角护罩注塑CAE与模具设计

以轿车左右外后视镜三角护罩为例,在详细分析护罩塑件结构、成型材料性能和塑件壁厚的基础上,采用MFI2015对其浇口位置进行了仿真分析。在综合"最佳浇口位置"、塑件结构和成对注塑的基础上,确定了模具采用热流道的牛角形潜伏浇口浇注系统和近型冷却系统方案;在对塑料成型工艺分析中,对影响产品质量的填充时间、流动前沿温度、速度压力切换时的压力、冻结层因子、气穴、锁模力、缩痕、体积收缩率、总变形量等进行了分析。运用UG软件对型腔、型芯结构,导向与塑件精度保证机构、顶出机构和各六套的侧向滑块分型、侧向斜顶抽芯机构,及其复位机构与模具的整体等进行了分析设计,完成了一次注射成型配对护罩塑件的模具设计。同时,运用由导柱导套+锥槽定位+楔紧镶块调节+厚薄调节垫组成的"四位一体"精度保证与保持系统,使塑件精度更高。     

聚丙烯注射成型收缩研究进展

在介绍注射成型中浇日凝固前收缩、制品模内冷却讨程收缩及脱模后制品自由收缩的收缩讨程和热收缩、结晶收缩、取向收缩、负收缩及后收缩等注射成型收缩原因的笨础}一,详细回顾了聚丙烯(PP)分子结构、共混、填充及加入成核剂等因素对注射成型收缩率的影响。同时,还讨论了注射温度、成型压力、成型时间、模具温度、冷却时间、充模辣度等注塑工艺条件以及制品厚度对PP注射成型收缩率的影响,介绍了生产中注射成型收缩的控制方法     

基于Moldflow与正交试验的尾罩注塑工艺与模具设计

选取电连接器中的聚苯硫醚(PPS)尾罩为研究对象,利用Moldflow软件分析得出了最佳浇口位置,并结合正交试验完成了尾罩的最优注塑工艺参数设计,分析了充填时间、模具温度、熔体温度和保压压力对体积收缩率的影响,并在此基础上成功实现了模具设计与试模生产。结果表明,Moldflow软件和正交试验的结合运用能为电连接器尾罩注塑成型提供理论依据与技术支持。     

The effect of the packing parameters,gate geometry,and mold elasticity on the final dimensions of a molded part

Despite a significant number of publications and the increasing use of numerical simulation, there is still a debate about the optimum gate design and packing conditions in the molding industry. Shrinkage uniformity for unfilled polymers is dominated by the time dependent pressure distribution in the cavity and the resulting volumetric shrinkage; gate freeze-off is obviously important and difficult to predict; and pressure gradients during the packing phase, depend on process and design parameters and are also affected by the mold elasticity. Molding trials have been conducted on an instrumented mold (fan gated rectangular slab, 2 mm thick) under a variety of processing conditions and with different gate thicknesses using HDPE (Solvay Eltex A1050). Pressure decay during the molding cycle at different locations along the flow path have been correlated with sample thickness distribution. Overpacking at moderate packing pressure is shown to be a direct consequence of mold elasticity and to be related to both filling flow rate and gate thickness. The decay to a finite residual pressure can be computed by coupling the mold elasticity with the PVT behavior of the polymer. The results highlight the importance of gate design and processing parameters on the dimensional accuracy of the part and low internal stress level. When dealing with thick gates, packing pressure profiling appears to be the best way to avoid gate area overpacking. Mold elastic deformation can play a significant role in the cavity pressure-time history, even for a seemingly stiff mold construction.     

Nature of contact between polymer and mold in injection molding. Part II: Influence of mold deflection on pressure history and shrinkage

In injection molding of thermoplastic parts, high hold pressures are set during the packing phase to generate a post‐filling, which compensates the shrinkage of polymer due to its cooling. The polymer pressure in mold cavity leads to a cavity deformation due to mold and machine compliance. Then, the increase in cavity thickness can modify the post‐filling and consequently the pressure history, the volumetric shrinkage and the part mass. The first goal of this paper is to present a simple method to locally determine mold rigidities: over‐packed slabs are injected and local deflections are determined from measurements of the local residual pressure, the local in‐plane shrinkages and the plate thickness. In the studied plate mold, which can be considered as stiff compared to some industrial molds, a rigidity of more than 1 μm/MPa has been measured close to the center of the plate. The second goal of this paper is to show the influence of mold deflection on dimensional properties. If the cavity thickness is small as for our 1‐mm‐thick plate mold, considering an infinitely rigid mold cannot do realistic predictions of polymer pressure history, volumetric shrinkages and part mass. Nevertheless, in‐plane shrinkage seems to be less affected by mold deflection. It means that the additional polymer mass due to mold deflection is mainly distributed in the part thickness.     

基于CAE技术的大型模具浇口位置优化设计

针对大型模具设计中完全依赖经验风险很大的问题,介绍利用CAE软件以填充时间、充模结束时的压力分布、顶出时制品体积收缩率和沉降斑等为目标,如何优化确定大型模具的浇口位置,为该模具的设计提供准确的科学依据。     

Experimental study of shrinkage and ejection forces of reinforced polypropylene based on nanoclays and short glass fibers

This study presents the influence of nanoclays and glass fibers on the shrinkage and ejection forces of polypropylene‐based composites for tubular parts produced by injection molding. An instrumented mold was used to measure cavity pressure, surface temperature and ejection forces in the tubular parts during the injection cycle. The materials used for the study were polypropylene homopolymer Domolen 1100L, nanoclays for polyolefin nanocomposites (P‐802 nanoMax, used in percentages of 2%, 6%, and 10%) and reinforced polypropylene homopolymer with a content of 10% and 30% glass fiber (Domolen P1‐013‐V10‐N and Domolen P1‐102‐V30‐N, respectively). Part shrinkage was measured 48 h after production. The results show that the incorporation of nanoclays reduces shrinkage and ejection forces while glass fibers decrease shrinkage and increase ejection forces due to an increase in elastic modulus. Nanoclays decrease the ejection forces when compared to glass fibers and pure PP. The effects of nanoclays are less pronounced than those of glass fibers. Moldings produced with different materials were also analyzed to assess the effect of mold temperature on the ejection forces. Shrinkage rises slightly by increasing the mold temperature while the ejection force decreases. POLYM. ENG. SCI., 58:55–62, 2018. © 2017 Society of Plastics Engineers     

基于压力梯度的注塑模浇口位置优化算法

给出了判断熔体充模流动是否平衡的判据,并根据熔体充模流动的物理本质,构造了基于压力梯度的搜索方法来优化浇口位置,以实现熔体平衡充填模具型腔的目的。算例表明基于压力梯度的搜索方案简单有效。     

电磁炉上盖注塑模具设计

分析了电磁炉上盖塑件的结构工艺特点。为了优化模具结构,减少塑件缺陷,采用Moldflow软件对其进行了最佳浇口位置、填充、翘曲变形等模拟分析。以模拟结果为依据,设计了轮辐式侧浇口注塑模,介绍了模具结构及工作过程。采用此模具结构实现了从注射到塑件落料的半自动化生产模,具结构合理生,产效率较高。