静压支撑-超声振动单点增量成形件几何误差试验研究

在单点增量成形过程中，板料的悬空特性和制件的回弹效应使成形过程易发生失稳，制件易产生起皱和破裂等缺陷。为解决制件的悬空区失稳和回弹问题，将静压支撑和超声振动引入单点增量成形技术中进行辅助成形。以典型圆锥台为研究对象，针对制件在轴向和法向几何误差的产生机理，设计相应的静压支撑系统和超声振动系统，通过试验研究静压支撑和超声振动对工件轴向误差和形面法向误差的影响规律。结果表明：静压支撑能够降低工件轴向误差41.98%；超声振动可以降低形面法向误差84.21%.

Experimental Study of Geometric Error of Static Pressure Support-ultrasonic Vibration Single Point Incremental Forming Parts

In the single point incremental forming process, the forming process is prone to instability, and the parts are prone to wrinkle and crack due to the suspended characteristics and the springback effect of sheet. In order to solve the problems of suspension region instability and springback, it is considered to introduce static pressure support and ultrasonic vibration into the single point incremental forming for auxiliary forming. The typical truncated cone is taken as the research object. The corresponding static pressure support system and ultrasonic vibration system were designed according to the mechanism of producing the geometric errors in the axial and normal directions. The effects of static pressure support and ultrasonic vibration on axial error of part and on normal error of shape surface were studied experimentsally. The results show that the static pressure support can reduce the axial error of part by 41.98%, and the ultrasonic vibration can reduce the normal error of shape surface by 84.21%. Key