AA7075-T6圆筒形零件热态颗粒介质压力成形过程的力学分析

摘要

Based on the pressure-transfer performance test of granule medium and the material per-formance test of AA7075-T6 sheet,plastic mechanics analyses were conducted for the flange area, force-tranfer area and free deforming area in the forming process of cylindrical parts by hot granule medium pressure forming(HGMF)process.The function relation of forming pressure was obtained under the conditions of internal pressure nonuniform distribution,and compared with test data,the results show that the larger deviation occurs in the middle and later period of forming and the theoretic maximum forming force is less than the test data by 24.6%.The results of processing test show that the limiting drawing ratio of AA7075-T6 cylindrical part(the bottom is free forming area)formed for one time by HGMF process is 1.71.The HGMF process has convenient operation and simple appara-tus,and it can realize the hot forming on light alloy sheet in the general pressure equipment.This process is suitable for the small batch of products in the field of aviation,spaceflight and military in-dustries.%基于颗粒介质传压性能试验和AA7075-T6板材材料性能试验，对采用热态颗粒介质压力成形(HGMF)工艺拉深成形圆筒形件的法兰区、传力区和自由变形区进行了塑性力学分析，求解得到内压非均匀分布条件下成形压力的函数关系式，并与实测数据进行比对。分析结果表明，在成形中后期产生较大的偏差，理论求解最大成形力低于实测值24.6％。工艺试验研究表明，在成形温度为250℃条件下，采用 HGMF 工艺可一道次成形 AA7075-T6圆筒形零件(底部为自由变形区)的极限拉伸比(LDR)为1.71。HGMF 工艺操作便捷，装置简单，可在通用压力设备上实现轻合金板材件热成形，适用于航空、航天和军工等领域中小批量产品。