Forming process of multi-step convex hull sheet

The invention belongs to the technical field of metal stamping, and relates to a forming process of a multi-step convex hull sheet, which comprises the following steps of: punching a positioning hole, pre-trimming, raising, shaping, accurately cutting and blanking, in the shaping step, a plurality of upper punches and a plurality of lower punches which are arranged in a staggered mode are adopted for overpressure shaping, one of the upper punches abuts against the datum plane and each step face, and the lower punches are used for abutting against the turning positions of the convex hulls and the datum plane. According to the method, the position of each step surface can be corrected after the multi-step convex hull is formed, stress is released by adopting an overpressure shaping method, and the final structure of the sheet meets the size requirement. 本发明属于金属冲压技术领域，涉及一种多台阶凸包片材的成型工艺，步骤包括：冲定位孔、预切边、打凸、整形、精切和落料，所述打凸步骤在基准面上冲出具有多个台阶面的凸包，所述整形步骤采用错位设置的若干上冲头和若干下冲头进行过压整形，所述基准面和每个台阶面被其一上冲头抵住，所述下冲头用来抵住所述凸包与所述基准面的转折位置。本发明