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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。
Liquid-filled impact composite forming technology is a high-energy forming method, suitable for sheet metal processing. In this paper, a new method of charging and punching impact is proposed, that is, after the liquid filling is completed, the compressed liquid is moved downwards by a rigid conical punch at high speed, and the instantaneous high pressure generated by the shock cone acts on the slab Punching. Among them, the pulse pressure action time is only 0.001s. Numerical simulation of the effect of blanking impact blanking force and the blanking experiment of 1mm low carbon steel show that in the process of blanking with liquid, extremely high instantaneous pressure acts in the form of waves. The kinetic energy obtained by blanking makes the blanking pressure lower than The deformation resistance and shock wave pressure stop the effect can continue to deformation, the formation of a large tensile stress in the blank, and shear stress formed by the blank itself down. These two stresses cause the necks to contract and crack, eventually breaking apart. Therefore, the impact of liquid charging and punching composite forming punching and traditional rigid punch shear stress are essentially the difference. The use of liquid as a punch, the mold manufacturing precision requirements significantly reduced, and blanking parts neat, almost no burrs, dimensional accuracy to meet the requirements.