论文部分内容阅读
电液成形是利用水中高压脉冲放电产生的冲击波使坯料发生高速率变形的塑性加工方法。基于柱面凹模进行5A02铝合金管坯电液成形试验,分析电压和金属丝直径对变形的影响;针对一步成形圆角变形区难以贴模现象,进行两步胀形试验。研究结果表明,变形量随放电电压升高而增大,在给定放电电压条件下,存在一个临界金属丝直径对应成形效果最佳,而临界金属丝直径随放电电压提高而增大。管坯变形总体上处于双向拉伸应变状态,其中变形区中间为近平面应变状态,靠近圆角区为近双等拉应变状态。相对于一步成形,在圆角区,两步电液成形接近完全贴模,壁厚分布相对均匀。
Electro-hydraulic forming is the use of high-pressure pulsating water shock generated by the blanking high rate of deformation plastic processing methods. The effects of voltage and wire diameter on the deformation were analyzed based on cylindrical concave die for 5A02 aluminum alloy tube blank. A two-step bulging test was carried out in view of the difficulty of die-bonding phenomenon in one-step forming round corner deformation zone. The results show that the deformation increases with the increase of the discharge voltage. Under the given discharge voltage, the critical wire diameter has the best forming effect and the critical wire diameter increases with the increase of the discharge voltage. The overall deformation of the tube is in the biaxial tensile strain state, of which the middle of the deformation region is the near-plane strain state and near the fillet region is near the double tensile strain state. Relative to the one-step forming, in the fillet area, the two-step electro-hydraulic forming is nearly completely die-closed, and the wall thickness distribution is relatively uniform.