汽车诊断器支架微孔注塑成型工艺参数优化
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摘要
为优化汽车诊断器支架浇注过程,研究分析微孔注塑成型工艺的参数。以碳酸钙增强聚丙烯(PP-T20)为成型材料,利用CATIA建立汽车诊断器支架3D模型;将模型导入Moldflow,考察浇口位置对充填时间和充填末端压力的影响,得到熔体流动平衡的两浇口浇注系统。选取模具温度、熔体温度、初始气体浓度及减重比共四个因素,每个因素下设置四个层级,开展L_(16)(44)正交试验,考察工艺参数对微孔半径的影响度。优化工艺方案为:模具温度70℃,熔体温度230℃,初始气体浓度0.25,减重比6%或8%。对浇口尺寸一致,浇口位置不同的两套方案进行检验,表明气泡半径均随标准厚度的增大而减小,且位置离浇口越远,气泡半径变小得越快。两套方案下气泡半径的区别不甚显著,表明此时N2含量对气泡成核的作用已达极限。
To optimize the pouring process of automobile diagnostic bracket and explore the optimization strategy of microporous injection molding process parameters.Calcium carbonate reinforced polypropylene(PP-T20) is used as the forming material,and a three-dimensional model of automobile diagnostic bracket is established using CATIA.The model is imported into Moldflow to investigate the effect of pouring location on filling time and end pressure,and a two-gate pouring system with melt flow balance is obtained.4 factors,namely,die temperature,melt temperature,initial gas concentration and weight loss ratio are selected,and 4 grades are set up under each factor.L16(44) orthogonal experiment is carried out to investigate the influence of process parameters on microporous radius.The optimum technological scheme is as follows:die temperature:70℃,melt temperature:230℃,initial gas concentration:0.25,weight loss ratio:6% or 8%.Two schemes with the same gate size and different gate locations are validated,showing that the radius of bubbles decreases with the increase of the standard thickness,and the farther away from the gate,the faster the radius of bubbles decreases.The difference between the radiuses of bubbles under the two schemes is not significant,indicating that the effect of N2 content on bubble nucleation has reached the limit.
To optimize the pouring process of automobile diagnostic bracket and explore the optimization strategy of microporous injection molding process parameters.Calcium carbonate reinforced polypropylene(PP-T20) is used as the forming material,and a three-dimensional model of automobile diagnostic bracket is established using CATIA.The model is imported into Moldflow to investigate the effect of pouring location on filling time and end pressure,and a two-gate pouring system with melt flow balance is obtained.4 factors,namely,die temperature,melt temperature,initial gas concentration and weight loss ratio are selected,and 4 grades are set up under each factor.L16(44) orthogonal experiment is carried out to investigate the influence of process parameters on microporous radius.The optimum technological scheme is as follows:die temperature:70℃,melt temperature:230℃,initial gas concentration:0.25,weight loss ratio:6% or 8%.Two schemes with the same gate size and different gate locations are validated,showing that the radius of bubbles decreases with the increase of the standard thickness,and the farther away from the gate,the faster the radius of bubbles decreases.The difference between the radiuses of bubbles under the two schemes is not significant,indicating that the effect of N2 content on bubble nucleation has reached the limit.
引文
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[2]胡广洪.微细发泡注塑成型工艺的关键技术研究[D].上海:上海交通大学, 2009.
[3]韩云,林有希.微孔注塑成型过程的Moldflow模拟仿真[J].合成树脂及塑料, 2017(1):60-65.
[4]金亚云.基于MPI的汽车座椅配件浇口优化设计[J].塑料科技,2017, 45(12):92-95.
[5]刘国亮.非对称多型腔模浇口位置优化设计[J].模具工业,2010, 36(4):1-3.
[6]庄俭,于同敏,王敏杰.微注塑成形中熔体充模流动分析及其数值模拟[J].机械工程学报, 2008, 44(9):43-49.
[7]陆元三,刘红燕.从塑件质量谈注射模浇口位置的选择[J].模具制造, 2011(8):42-45.
[8]张宇,刘恩,陈弦,等.注射成型中流道平衡优化设计的应用[J].塑料, 2011, 40(4):87-89.
[9]胡福文,程佳剑,姜鑫.陶瓷材料自由挤出3D打印成型及烧结精度研究[J].工业技术创新, 2018, 5(4):12-17.
[10]高浩天.基于Moldflow的投影仪底板注塑成型分析与优化[J].工业技术创新, 2017, 4(1):92-95.