共查询到19条相似文献,搜索用时 625 毫秒
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采用Moldflow软件对蓄电池盖的注塑成型过程进行了仿真模拟,在此基础上对模具的浇注系统和冷却系统进行了优化设计.然后,运用正交设计的方法分析了注塑工艺参数对蓄电池盖的注塑成型的影响,提出了更适合于阻燃材料的注塑工艺条件. 相似文献
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在UG中建立了塑件的三维数据图,借助模流分析(Moldflow)软件对塑件注射压力、时间、温度、浇注系统进行计算机辅助工程分析(CAE),确定最优的注射压力、注射时间、模具温度、熔体温度、浇口位置及流道等。优化了注塑工艺参数、注塑模具的设计,确定了最佳的注塑工艺方案,快速成型出优质的塑料制品,提高了模具的质量,缩短了模具的开发周期。 相似文献
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利用Moldflow软件对薄壁件的注塑成型过程进行了模拟分析,设计了两种注塑成型方案,并进行了模流分析和翘曲情况分析,选择出最优的注塑方案。使用正交试验法分析翘曲变形的影响因素,寻找最优参数使薄壁件的翘曲变形最小。分析结果表明:薄壁件最优的注塑方案为两个浇口注塑方案;各因素对翘曲变化的影响程度为保压压力保压时间熔体温度模具温度;最优工艺参数为A2B1C2D2,即熔体温度280℃、模具温度60℃、保压时间10s、保压压力140MPa。最大翘曲变化量由优化前的2.781mm降到优化后的1.661mm。 相似文献
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基于BP-NSGA的注塑参数多目标智能优化设计 总被引:1,自引:0,他引:1
为获得成型性能最优的注塑参数设计方案,提出了基于BP神经网络和非支配排序遗传算法的注塑参数多目标优化方法。将注塑模结构尺寸参数和注塑工艺参数作为待优化的设计变量,建立了以高质量、低成本、高效率为优化目标的注塑参数优化设计模型。基于非支配排序遗传算法获取给定参数范围内的所有Pareto最优解,并通过建立多输入和多输出的BP神经网络来快速获得非支配排序遗传算法优化进程中所有个体的适应度值。开发了基于BP神经网络与非支配排序遗传算法集成的注塑参数智能优化设计系统,并通过鼠标注塑参数设计实例,验证了其适用性和有效性。 相似文献
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精密注塑制品残余应力的试验研究及其计算 总被引:1,自引:0,他引:1
注塑残余应力对精密注塑制品的力学性能和光学性能等有重要影响,是精密注塑制品质量控制的关键指标之一。为研究注塑成形过程中残余应力的发展,以丙烯腈—丁二烯—苯乙烯共聚物(Acrylonitrile butadiene styrene,ABS)塑料为研究对象,对其模内蠕变行为进行试验研究。将热弹性模型计算的收缩应变与试验测量的收缩应变之间的差值定义为制件的模内蠕变,得到注塑工艺条件对模内蠕变的影响规律。在此基础上构建计算精密注塑制品残余应力的蠕变模型。模型中的材料弹性模量可由Tait方程计算得到,粘壶系数采用反演方法计算得到。利用该模型结合薄壳有限元法对ABS平板注塑件残余应力进行计算,对计算结果进行试验验证,并与普通的松弛模型计算进行比较。计算结果表明,该模型的计算精度高于普通的松弛模型,是解决精密注塑制品残余应力预测问题的新的有效方法。 相似文献
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Water-assisted injection molding (WAIM),a newly developed fluid-assisted injection molding technology has drawn more and more attentions for the energy saving,short cooling circle time and high quality... 相似文献
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针对精密注塑加工的关键技术,分析了模腔压力、预塑计量和温度等影响注塑制品质量的重要参数及其控制原理,采用欧姆龙可编程控制器PLC构成注塑加工多级控制系统,通过直接检测模腔压力来控制充填和多级保压过程,进行实验与分析研究。 相似文献
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ZHOU Hua ZHANG Zengmeng GAO Yuan'an YANG Huayong 《机械工程学报(英文版)》2010,23(4):418-427
Water-assisted injection molding(WAIM), an innovative process to mold plastic parts with hollow sections, is characterized with intermittent, periodic process and large pressure and flow rate variation. Energy savings and injection pressure control can not be attained based on conventional valve control system. Moreover, the injection water can not be supplied directly by water hydraulic proportional control system. Poor efficiency and control performance are presented by current trial systems, which pressurize injection water by compressed air. In this paper, a novel water hydraulic system is developed applying an accumulator for energy saving. And a new differential pressure control method is proposed by using pressure cylinder and water hydraulic proportional pressure relief valve for back pressure control. Aiming at design of linear controller for injection water pressure regulation, a linear load model is approximately built through computational fluid dynamics(CFD) simulation on two-phase flow cavity filling process with variable temperature and viscosity, and a linear model of pressure control system is built with the load model and linearization of water hydraulic components. According to the simulation, model based feedback is brought forward to compensate the pressure decrease during accumulator discharge and eliminate the derivative element of the system. Meanwhile, the steady-state error can be reduced and the capacity of resisting disturbance can be enhanced, by closed-loop control of load pressure with integral compensation. Through the developed experimental system in the State Key Lab of Fluid Power Transmission and Control, Zhejiang University, China, the static characteristic of the water hydraulic proportional relief valve was tested and output pressure control of the system in Acrylonitrile Butadiene Styrene(ABS) parts molding experiments was also studied. The experiment results show that the dead band and hysteresis of the water hydraulic proportional pressure relief valve are large, but the control precision and linearity can be improved with feed-forward compensation. With the experimental results of injection water pressure control, the applicability of this WAIM system and the effect of its linear controller are verified. The novel proposed process of WAIM pressure control and study on characteristics of control system contribute to the application of water hydraulic proportional control and WAIM technology. 相似文献
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孙振强 《机电产品开发与创新》2012,25(1):171-173
塑料注塑成型机的诸多输入、输出参数中,料筒温度是工作过程中的重要被控参数。论文针对传统注塑机温控系统存在的超调量大、调节时间长等诸多不足,提出了以单片机为控制核心,应用模糊控制理论,设计出模糊控制器,实现注塑机温度的实时控制,对于提高注塑机温度控制精度具有较好的意义。 相似文献
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