大型薄壁件熔融成形数值计算与工艺实验研究
发布时间：2018-11-22 20:44
【摘要】：针对熔融挤出成形大型薄壁件时易出现变形、开裂的问题,提出采用激光束对成形区进行辅助加热以提高成形质量和精度。采用计算流体动力学方法建立熔融挤出成形过程数值计算模型,对熔融挤出成形特征区域温度历程及三维形貌特征进行分析与实验验证。研究了成形速度、激光功率、激光辅助加热方式对成形区聚合物熔体表面温度及粘度的影响。研究结果表明采用侧向激光辅助加热方式比前后置激光辅助加热方式对粘接区域表面温度提升更高;采用激光辅助加热显著提高了薄壁件抗拉强度,其最大提高幅度可达195%;采用激光辅助加热后,成形件表面粗糙度有所降低,层间粘接宽度比先前提高近24%。
[Abstract]:In order to solve the problem of deformation and cracking of large thin-walled parts formed by melt extrusion, the laser beam is used to heat the forming zone to improve the forming quality and precision. A numerical model of melt extrusion forming process was established by using computational fluid dynamics (CFD) method. The temperature history and 3D morphology of melt extrusion forming were analyzed and verified by experiments. The effects of forming speed, laser power and laser assisted heating on the surface temperature and viscosity of polymer melt were studied. The results show that the surface temperature of bonding area is raised higher by laser assisted heating than that by laser assisted heating, and the tensile strength of thin wall parts is improved by laser assisted heating, and the maximum increase is up to 195. After laser assisted heating, the surface roughness is decreased, and the bonding width is increased by 24%.
【作者单位】： 西安交通大学机械制造系统工程国家重点实验室;
【基金】：陕西省自然科学基金项目(2014JQ7238)
【分类号】：TH16
[Abstract]:In order to solve the problem of deformation and cracking of large thin-walled parts formed by melt extrusion, the laser beam is used to heat the forming zone to improve the forming quality and precision. A numerical model of melt extrusion forming process was established by using computational fluid dynamics (CFD) method. The temperature history and 3D morphology of melt extrusion forming were analyzed and verified by experiments. The effects of forming speed, laser power and laser assisted heating on the surface temperature and viscosity of polymer melt were studied. The results show that the surface temperature of bonding area is raised higher by laser assisted heating than that by laser assisted heating, and the tensile strength of thin wall parts is improved by laser assisted heating, and the maximum increase is up to 195. After laser assisted heating, the surface roughness is decreased, and the bonding width is increased by 24%.
【作者单位】： 西安交通大学机械制造系统工程国家重点实验室;
【基金】：陕西省自然科学基金项目(2014JQ7238)
【分类号】：TH16
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