中空挤出吹塑型坯壁厚设计与优化技术研究  

Study on Design and Optimization Techniques of Parison Thickness for Extrusion Blow Molding

作　　者：张树有[1] 毛锋[1] 黄长林[1] 

机构地区：[1]浙江大学CAD&CG国家重点实验室,杭州310027

出　　处：《中国机械工程》2009年第5期606-611,共6页China Mechanical Engineering

基　　金：国家科技支撑计划项目(2007BAF13B02);浙江省自然科学基金资助项目(Y107431)

摘　　要：中空挤出吹塑型坯壁厚尺寸直接影响塑料容器的制造成本。提出了基于Catmull-Rom样条的型坯壁厚设计方法,该方法考虑Catmull-Rom样条的几何连续性,采用基于型值点和形状参数两种自由度的修改操作。根据型坯壁厚控制的连续性和快速响应的要求,设计了基于曲率的壁厚曲线自适应数据采样算法。基于弹性有限元方法模拟了型坯吹胀过程,实现了型坯壁厚形状的优化设计。仿真实验结果表明,壁厚数据编辑操作的方便性和灵活性得到改善,壁厚数据质量和壁厚控制精度得到提高。开发了型坯壁厚控制人机界面软件,并进行了应用验证,取得了良好的效果。The parison thickness for extrusion blow molding has direct effects on the manufacturing cost of hollow plastic parts. A new method of computer aided design for parison thickness was presented based on Catmull--Rom spline, which used geometric continuity of the Catmull--Rom spline, and operated curves by a set of control vertices and a set of shape parameter values. In order to satisfy the requirements of good continuity and fast--respondability of the parison thickness controlling, a new algorithm of adaptive data sampling based on curvature was proposed. Based on elasticity finite elements method analysis, the parison inflation in the plastics extrusion blow molding was simu lated, and the optimal shape of parison thickness had achieved. Experimental results indicate that this technology makes it easier to edit and revise the values of parison thickness, and can obtain values of superior quality and performance. Human--machine interface software of the parison thickness control system was developed, and applied in the extrusion blow production activity. The results show the utility of this technology.

关 键 词：挤出吹塑 型坯壁厚 CATMULL-ROM样条 优化设计 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]