带把手HDPE油桶挤出吹塑型坯壁厚的数值模拟优化

摘要

The process respectively from the uniform thickness initial parison and the optimal non-uniform thickness initial parison to form a high density polyethylene plastic oil drum with handle through the extrusion blow molding technique was numerically simulated by using the computational fluid dynamics software (POLYFLOW) under isothermal and the same blowing pressure conditions.The initial parison was divided into ten segments by means of Parison Programming of POLYFLOW. The thickness of the blow molding product was controlled through controlling the thickness of the ten segments. The results show that most wall thickness of the oil drum extruded from the uniform 5.0 mm thickness initial parison is less than 3.0 mm before optimization. The parison thickness and the mass of the oil drum were improved by adopting the post-process of POLYFLOW. After six optimizations, all the wall thickness of the oil drum is larger than 3.0 mm. After the fourth optimization, the mass of the oil drum is 646.89 g, while after the sixth optimization, the mass of the oil drum decreases to 642.68 g.%使用计算流体力学软件(POLYFLOW),在温度和吹气压力相同的条件下,分别数值模拟了均一壁厚初始型坯和优化的非均一壁厚初始型坯挤出吹塑高密度聚乙烯(HDPE)带把手油桶的过程.用POLYFLOW软件中的型坯控制程序,将初始型坯分成10段,通过控制这10段型坯的厚度来控制吹塑制品的壁厚.结果表明:均一壁厚5.0 mm的初始型坯经过吹胀阶段后,油桶大部分壁厚都小于3.0 mm;使用POLYFLOW后处理程序对油桶型坯6次优化后,吹塑制品壁厚均大于3.0 mm,且在第4次优化的基础上将油桶质量从646.89 g降至642.68 g.