摘要
充液冲击复合成形技术是一种高能率成形方法,适用于薄板加工。该文提出一种新型充液冲击冲裁方法,即在充液成形完成零件特征后,再以刚性锥形冲头高速向下运动压缩液体,产生的瞬时高压以冲击波的形式作用在板坯上进行冲裁。其中,脉冲压力作用时间仅0.001s。充液冲击冲裁力作用形式数值模拟及1mm低碳钢板冲裁实验结果表明,充液冲击冲裁中,极高瞬时压力以波的形式作用,板料获得的动能使其在冲击波压力低于其变形抗力和冲击波压力停止作用后仍能继续变形,在坯料中形成较大拉应力,而剪应力由坯料自身向下运动形成。这两种应力使坯料产生缩颈和裂纹,最终断裂分离。因此,充液冲击复合成形技术冲裁与传统刚性凸模剪应力作用有本质区别。采用液体作为凸模,对模具制造精度要求大幅降低,且冲裁件断面整齐、几乎无毛刺,尺寸精度满足要求。
The innovative hybrid impact hydroforming （IHF） is a kind of high energy rate forming technology ,which can be used for punching thin plates .In this paper ,the punching theory of IHF is presented .After IHF of the parts ,a rigid conical punch is quickly moved to compress the liquid and produce instantaneous high pressure , then the shock waves induced by the high pres-sure is used to punch the sheets with 0.001s duration time .By the simulation of acting mode and the punching experiments of low carbon steel plates with 1mm thickness ,it is shown that the sheets can obtain enough kinetic energy to be deformed when the shock waves disappeared . The punching occurred via the combined tensile and shear stress effects instead of only by the conven-tional tensile stress effect . There is an essential difference between the hybrid IHF punching and the conventional rigid punching . Using the liquid as the punch , the manufacturing precision of forming die can be greatly reduced and the burr-less parts with im-proved quality can be easily obtained .
出处
《塑性工程学报》
CAS
CSCD
北大核心
2014年第2期51-54,共4页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(1175024)
国际科技合作资助项目(2010DFA52030)
关键词
充液冲击成形
冲裁
高能率成形
冲击波
hybrid impact hydroforming （IHF） technology
punching
high energy rate forming
shock wave
