Research on Multi-head Stretch Forming Technology of Sheet Metal

Multi-head stretch forming(MHSF) is a new flexible technology for manufacturing sheet metal, and its multiple adjustable grippers substitute for integral structure grippers in the traditional stretch forming, it has the characteristics that these grippers can real-time adjust displacement and rotation according to variety of die curvature. The MHSF forming principle is introduced and corresponding equipment has been developed. Different technology about MHSF and traditional stretch forming were simulated, the stress distribution and thickness variation of the forming parts with different transition zone length were analyzed. The results show that MHSF can improve material utilization and forming quality of the parts. The MHSF experiment was performed and typical spherical parts were formed. The experimental results are in good agreement with simulation results, which proves feasibility of the MHSF technology and practicability of the MHSF equipment.