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运用Moldflow软件进行某后盖产品的翘曲变形分析,结合Moldflow软件的翘曲变形分析理论,将影响注塑件的翘曲变形因素分为3类:冷却不均、收缩不均及取向因素。然后针对翘曲变形不同的影响因素提出冷却优化、结构优化、保压优化及反变形设计等优化方案。分析结果表明:提出的这几种优化方案能极大地改善注塑件的翘曲变形,为注塑制品企业在控制产品尺寸、满足装配质量要求、改善翘曲变形等方面提供优化思路及工艺参考。 相似文献
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以某显示器结构件为研究对象,注塑件在工作状态下的Mises应力值为评价指标,结合注塑成型数值仿真和结构分析数值仿真,采用正交设计、极差和方差分析方法,获得了最佳工艺参数组合。进行了单因素变动实验,研究了单工艺参数对注塑件力学性能的影响。结果表明:随熔体温度的升高、模具温度的降低、保压压力降低和保压时间的减少,该结构件在工作状态的Mises应力会增大。研究结果对提高注塑件的结构分析精度和指导注塑工艺参数的选取具有一定的参考价值。 相似文献
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注塑件翘曲变形分析与成型工艺参数优化 总被引:2,自引:0,他引:2
基于正交实验设计,利用Moldflow软件对注塑件注塑成型进行数值模拟。结果表明,保压时间、注射时间、熔体温度对注塑件翘曲变形的影响高度显著。运用方差分析,研究注塑成型参数对注塑件翘曲变形的影响,进行多元线性回归分析,发现注塑件翘曲变形幂函数回归模型与实验数据有很好的相关性。以影响翘曲变形的主要工艺参数为设计变量、翘曲变形为目标函数,建立幂函数回归优化模型,对成型工艺参数进行优化,得到的翘曲变形值小于主实验中的翘曲变形最小值,表明该方法具有较好的工程实用价值。 相似文献
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研究了风机外壳的结构和注塑成型工艺,并使用Moldflow软件对其进行翘曲优化分析。分析了初始方案成型过程,得到该注塑件的翘曲原因,这主要是由于,冷却不均匀和收缩不均匀。针对该注塑件翘曲的原因,对其进行了冷却系统和保压的优化,风机外壳的总翘曲变形值从4. 77 mm下降到1. 815 mm,降低了61. 9%,效果显著,达到了该风机外壳模具设计的翘曲要求,为注塑模具优化设计提供了合理依据。实践证明,优化后的翘曲控制成型工艺方案能够有效降低翘曲变形,注塑出合格制品,满足了客户的要求。 相似文献
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对聚醚酰亚胺过滤器壳体注射成型制件的缺陷尤其是开裂缺陷进行分析,发现模具温度的高低直接关系到制件的内应力大小,是引起开裂缺陷的主要原因;指出生产成型温度较高的工程塑料制品时,在工艺设计编制中要对模具温度提出相应的要求,并严格加以控制。 相似文献
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分析了注射成型过程中影响薄壁制品应力翘曲的因素,给出了注射成型时制品翘曲变形的数学模型及其求解方法.利用数值模拟的方法,模拟出光盘片架注塑过程中的不同模具设计和工艺条件对其翘曲变形程度的影响.根据模拟结果,分析出在原材料和制品结构确定的情况下,流动不平衡和冷却不均衡是影响薄壁光盘片架应力翘曲的主要因素,提出了解决应力翘... 相似文献
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《塑料、橡胶和复合材料》2013,42(8):401-410
AbstractThis paper describes an investigation into the thermoformability of a new class of oriented polymeric material recently developed, namely hot compacted polypropylene sheet. Exploitation of any new material requires an intimate understanding of a whole range of factors, amongst which thermoformability is pre-eminent. This is particularly true for oriented polymeric materials, for while the preferred molecular alignment gives enhanced properties such as stiffness, strength, and resistance to impact, the downside is that the stretched molecular chains tend to limit further flow under stress, making thermoforming difficult. The aim of the present study was to establish the critical parameters for successful thermoforming of hot compacted polypropylene sheet.Elevated temperature tensile tests were used to investigate the stress–strain behaviour of the compacted materials. The crucial parameters were found to be the post-yield modulus, which gives a measure of the resistance of the material to large scale deformation, and the strain to failure, which gives the upper limit on deformation. The post-yield modulus was found to be significantly affected by the test temperature and the high strain hardening behaviour of the material confirmed that significant force is required to thermoform the compacted polypropylene sheets. A hemispherical mould, with built-in gripping plate, was used to carry out a study of the thermoforming behaviour of the compacted sheets, and the results were found broadly to confirm the conclusions of the tensile tests. A linear relationship was found between the tensile force and the postforming force, reinforcing the synergy between the two tests. In addition the forming tests showed that the best temperatures to use were either side of the melting point of the melted and recrystallised phase, depending on the amount of postforming deformation required. Different gripping arrangements were investigated both in which the sheet was fully gripped and in which the sheet was allowed to flow into the mould during forming. The different schemes were found to control whether a successful component could be produced under different conditions and at different ultimate strains. Finally, the tests with the hemispherical mould showed that thermoforming this shape requires significant interlaminar shear deformation, and above 15% strain this resulted in destruction of the interlayer bond. For strains greater than this, successful thermoforming could only be achieved by allowing the material to flow into the mould. 相似文献
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模压成型过程中的复合材料在模腔内的力学分析 总被引:3,自引:0,他引:3
树脂基复合材料在模压成型过程中,在压力作用下,形成可压缩流动.由于每种物料的性质不同,在压缩流动时的取向、相互之间的摩擦系数不同,再加上因受模具几何形状的限制,物料与模具壁之间摩擦阻力不同,导致物料在模具内各方向的流动速度和各轴向应力不同.分析和掌握模压成型过程中树脂基复合材料的应力变化规律,可正确指导树脂基复合材料的生产. 相似文献
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分析了聚碳酸酯的注射成型工艺特性,讨论了影响聚碳酸酯制品质量的工艺因素,包括模具与设备、制品与嵌件结构、原材料干燥、注射温度、注射速率、注塑压力、成型周期、模具温度、制品后处理等。总结了聚碳酸酯注射成型制品常见的缺陷及解决措施。 相似文献
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轿车后保险杠裙围凹陷变形原因探析与解决方案 总被引:3,自引:1,他引:2
对轿车后保险杠塑料裙围开发过程中的所有环节进行研究,尝试用CATIA软件进行产品优化及模具改进,同时优化注塑工艺参数,并采用Moldflow软件对改进效果进行数值模拟,找到了一种经济有效的解决收缩变形的途径。 相似文献