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通过有限元模拟法分析了挤压针回抽速度对不锈钢挤压管尾部内表面的影响,对比了150、50、25、12.5、10mm/s五个不同回抽速度的尾部内表面。结果表明,随着回抽速度的降低,尾部内表面橘皮状缺陷明显得到缓解。以50mm/s的速度回抽时,挤压出的不锈钢管会发生回退现象;当回抽速度下降到10 mm/s以下时,橘皮状褶皱缺陷基本消失。在挤压准?219 mm×11 mm管时,尾部橘皮状褶皱缺陷段的长度正是挤压针长度减去与挤压筒模配合段后的长度和挤压针导向段长度。
The influence of squeezing speed of extrusion needle on the inner surface of stainless steel extruded tube was analyzed by finite element simulation. The inner surface of the tail of five stainless steel extruded tubes were contrasted with 150, 50, 25, 12.5 and 10 mm / s. The results showed that the orange peel defects on the inner surface of the tail were relieved obviously with the decrease of pumping speed. When the speed of 50mm / s is withdrawn, the extruded stainless steel tube will regress. When the withdrawal speed drops below 10 mm / s, the orange-furrow wrinkle basically disappears. In the quasi-219 mm × 11 mm tube, the length of the tail orange-peel pleat folds is the length of the extrusion needle minus the length of the extrusion tube mating section and the length of the extrusion needle guide.