Die and method for front and back deep drawing of double-layer cylindrical parts

Abstract

The invention discloses a front and back drawing forming die and method of a double-layer cylindrical part. The lower end of the mold has a punch and a die, the die has a deep drawing groove, the upper end of the die has a back pressure punch and a convex ring, and the convex ring is covered with a blank holder. When forming positive and negative deep drawing, the plate is placed on the mold. At the beginning, the upper end of the punch is flush with the bottom end of the blank holder, and the plate is placed between the punch and the convex ring. The convex ring is stationary, and the bottom punch moves upward. The drawn sheet flows into the convex ring, and the sheet gradually covers the punch under the action of the back pressure of the back pressure punch, the downward pressure of the convex ring and the upward pressure of the punch. When the punch rises to the specified stroke, it begins to fall. When the convex ring goes down to draw the sheet, under the pressure of each part in the mold, the thickness of the sheet covering the punch part remains basically unchanged, while the sheet below the blank holder continues to be fed until the sheet is attached to the die, and the forming is terminated . The invention saves molds, shortens the processing procedure of workpieces and improves production efficiency.

Description

technical field [0001] The invention relates to the technical field of metal plates, and more specifically relates to a front and back drawing die and method for a double-layer cylindrical part. Background technique [0002] In the fields of automobiles, electronics, aviation, etc., the shape of some metal parts to be processed is relatively complex, and it is difficult to form one-time spinning by the spinning process. Parts with relatively high surface quality requirements are difficult to process, and the blank of the workpiece can be manufactured by stamping. However, when the ordinary stamping method is used for processing, it is impossible to complete the one-time stamping of the positive and negative deep-drawing structures, and the parts need multiple sets of molds and processes to form. Such a processing method has high processing costs and poor economic benefits. [0003] At present, the positive and negative deep drawing method used to make curved surface parts o...

AI Technical Summary

Problems solved by technology

However, when the ordinary stamping method is used for processing, it is impossible to complete the stamping of the positive and negative deep-drawing structures at one time, and the parts need multiple sets of molds and processes to form. Such a processing method has high processing costs and poor economic benefits.

[0003] At present, the positive and negative deep drawing method used to make curved surface parts or parts with small drawing coefficient and large drawing change degree is generally to use a punch or die with a slightly larger diameter for positive drawing, and punch out a slightly larger diameter. The cylindrical blank, and then use a small diameter punch or die to reverse the blank, or punch the hole first and then process the outer circle of the part. Some of these methods need to use multiple sets of molds to deep-draw the workpiece, and some When the workpiece is reverse-drawn, the plate near the tangent between the positive-drawing punch or the concave film chamfer and the cylinder wall is prone to breakage, and it is not easy to process the workpiece that requires the flange edge

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