论文部分内容阅读
对于2A12铝合金阶梯形杯形件的塑性成形,传统工艺是由每一级的台阶单工序成形,积累为最终的多阶梯成形,由于多次加热、多套模具、多道次挤压、多道次定位放置的误差积累会造成尺寸精度低、能耗高、效率低、模具导柱和导套不耐高温的缺陷。对于杯形件的侧壁直肋与台阶外形,用传统工艺挤压内、外圆角(小于R0.5mm时)很难完成。通过有限元模拟和工艺优化,本文采用凹模内不脱模连续挤压、控制流向顺序的方法,以及采用十字键模口导向结构,形成了一次加热、一次放置毛坯成形多台阶、小圆角的新工艺。该工艺缩短了工时,提高了产品性能和材料利用率,为小圆角多台阶类型的零件实现短流程的挤压工艺转化提供了参考依据。
For the plastic forming of the 2A12 aluminum alloy step-shaped cup, the traditional process is formed by the single-step process of each step, and is accumulated into the final multi-step forming. Due to the multiple heating, multiple sets of dies, multi-pass extrusion, The error accumulation caused by the position positioning can result in the defects of low dimensional accuracy, high energy consumption, low efficiency and high temperature resistance of the guide pins and guide bushings. For cup-shaped ribs on the side wall and the step profile, with the traditional extrusion process, the outside corner (less than R0.5mm) is difficult to complete. Through the finite element simulation and process optimization, this article adopts the method of continuous extrusion without die release in the die to control the flow order, and adopts the cross-die die-guide structure to form a single heating, New craft The process can shorten working hours, improve product performance and material utilization, and provide reference for the short-run extrusion process of small-sized multi-step parts.