Deep drawing die based on variable blank holder force control

Abstract

The invention belongs to the technical field of punching dies, and specifically provides a deep drawing die based on variable blank holder force control. The deep drawing die comprises an upper fixedplate, a lower fixed plate, guide sleeves, guide columns, a male die, a fixed base, a female die, an ejecting mechanism and a pressing mechanism. The pressing mechanism comprises a pressing plate, guide rods, second springs, a regulation plate, limiting ejection rods and guide sleeves. In the deep drawing die, the pressing plate in the pressing mechanism makes contact with a to-be-punched plate, then the edge of the to-be-punched plate is pressed, then the limiting ejection rods make contact with the upper surface of the female die, and therefore the regulation plate is limited to continue toget close to the pressing plate, the second springs between the regulation plate and the pressing plate are limited to continue to be compressed, the extrusion force provided by the second springs islimited to continue to increase, it is ensured that the blank holder force provided by the pressing plate for the to-be-punched plate cannot be increased along with increase of the deep drawing height, the problem of blank holder fracture caused by excessively-large blank holder force is prevented, and precision and quality of thin plate punching are improved.

Description

technical field [0001] The invention belongs to the technical field of stamping dies, in particular to a deep drawing die based on variable blank holder force control. Background technique [0002] Wrinkling and cracking are the main failure modes of sheet drawing. The size of the blank holder force and the loading method are one of the important factors affecting the wrinkling and fracture. The traditional blank holder force control method is generally based on increasing the loading mode, that is, with The punch stroke decreases and the blank holder force increases linearly; while the variable blank holder force control is to apply a time-varying blank holder force at different times when the stamping flange shrinks during the sheet drawing forming process, or when the stamping flange shrinks. At different positions, apply different blank holder forces that vary with time. By adjusting the positive pressure at each point, the frictional resistance of the contact surface be...

AI Technical Summary

Problems solved by technology

The present invention is mainly used to solve the problem that when the existing drawing die is stamping, the blank-holding force on the plate to be stamped will increase with the increase of the drawing depth, which will cause the edge of the plate to be stamped to fail to slide toward the center. Are torn apart, causing problems stamping scrapped parts

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