Reverse drawing method for soft die with peripheral auxiliary thrust

Abstract

The invention discloses a reverse drawing method for a soft die with peripheral auxiliary thrust. Reverse drawing equipment for implementing the reverse drawing method mainly comprises a punch, granular media, a blank holder, a plate, a thrust ring, a female die, an ejector rod, a base and the like. When the plate is formed, a preliminarily formed cylindrical part of the plate is fastened on the female die, the blank holder exerts blank holding force, the punch descends to compress the granular media, pressure is applied to the preliminarily formed cylindrical part of the plate, a soft male die can be formed, force is applied to the thrust ring by the ejector rod, and accordingly the peripheral auxiliary thrust can be applied to the cylindrical part; after drawing is completed, a workpiece clings to the inner wall of the female die, and can be finally shaped. Compared with the traditional forming method, the reverse drawing method has the advantages of simple structure, energy conservation, environmental protection and capability of obviously upgrading forming limit on plate parts.

Description

Technical field [0001] The invention relates to a method for forming sheet metal. Background technique [0002] It is very difficult to use conventional deformation methods for the deep drawing of some large aspect ratio plates and the deep drawing of difficult-to-form materials, which has become the bottleneck of their processing and has become a research hotspot. The current common solution is liquid-filled deep drawing technology. Liquid-filled deep drawing is the use of filling a female die with a liquid. When the male die moves downward, the liquid is forced to generate pressure to tightly attach the slab to the male die, forming a "friction retention effect" that is beneficial to forming. At the same time, due to pressure, Liquid can overflow between the plate flange and the die, reducing harmful frictional resistance and forming an "overflow lubrication effect". It is with the above two effects that the forming limit of the plate is greatly improved, the precision of the...

AI Technical Summary

Problems solved by technology

In this patent, after the radial granular medium is pushed by the top plate, it is easy to plug into the gap between the sheet material, the die and the positioner, which increases the friction between the sheet material and the mold, increases the drawing force, and is not conducive to forming; at the same time, the granular medium is in the There is an attenuation effect in the process of force transmission, and the thickness of the sheet metal in the reverse drawing process is relatively thin, and the thrust exerted by the granular medium on the end face of the sheet metal is very limited

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