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为改善挤出吹塑过程中制件壁厚不均现象,在型坯壁厚非均匀优化方法的基础上,使用计算流体力学软件Polyflow数值模拟了HDPE油桶的非等温吹胀,并利用初始型坯温度优化程序,通过改变初始型坯局部温度来控制吹胀制品的壁厚。结果表明,使用初始型坯温度优化程序对非均匀初始壁厚型坯进行5次优化后,吹塑制品的壁厚均趋近于目标壁厚值0.003 m,且达到壁厚平均函数最小值3.6×10~(-6)m~2。
In order to improve the unevenness of the workpiece wall thickness in the process of extrusion blow molding, on the basis of non-uniform optimization of the wall thickness of the parison, the non-isothermal inflation of the HDPE drum was simulated by Polyflow numerical simulation software. Parison temperature optimization program controls the wall thickness of the blown product by changing the initial temperature of the initial parison. The results show that the wall thicknesses of the blow molded products approached the target wall thickness of 0.003 m and reached the minimum value of the average wall thickness function 3.6 after initial optimization of the inhomogeneous initial wall thickness parison by using the initial parison temperature optimization program × 10 ~ (-6) m ~ 2.