The open-door push plank of recorder core is shaped as an irregular multilateral bending part, which needs highly bending accuracy. When material is sent into next station, the bended part will be intervened by the structure of the mould after bending and shaping, and the design of mold structure will be difficult. After comprehensive consideration of parts processing scheme, the integral and insert concave die, two pairs in a row 10-station progressive die production were adopted, and a intensified stripper plate with a trough was designed, so as to make the bended bar conveying smoothly. The intervened problem of bended material sending was solved in the aspect of the mold structure, and good use effect was achieved.