Variable-blank-holding-force beam type drawing die

Abstract

The invention discloses a variable-blank-holding-force beam type drawing die. The variable-blank-holding-force beam type drawing die comprises a concave die base, a protruding die base and a blank holder assembly, wherein the concave die base and the protruding die base are arranged in an up-and-down mode, the blank holder assembly is located between the concave die base and the protruding die base, a protruding die is arranged on the protruding die base, at least two groups of nitrogen spring assemblies are arranged on the front side and the rear side of the protruding die on the protruding die base respectively, tops of nitrogen spring assemblies contact with the lower surface of the blank holder assembly, the protruding die contacts with the blank holder assembly, and the lower surface of the concave die base contacts with the upper surface of the blank holder assembly. By the aid of the variable-blank-holding-force beam type drawing die, arc-shaped springback of cross beam side walls is reduced, the problem of beam distortions is well solved, and the wrinkling phenomena of pressing face materials are reduced, so that a cross beam is shaped and deformed fully, internal stresses of parts are reduced, and the overall springback of parts is reduced.

Description

technical field [0001] The invention relates to a drawing die, in particular to a variable blank-holding force beam drawing die. Background technique [0002] In the mold design of the high-strength steel plate beam parts of the automobile body, the drawing die generally uses the force of the air cushion ejector to realize the force source of the mold structure movement, the pressing force and the drawing force are always the same, and the drawing die generally The force of the air cushion ejector is used as the downward pressure source, and the blank holder force is constant during the forming process. The problem with the drawing die of this structure is that the forming force required by the part during the drawing process is gradually increased. , the constant blank holder force cannot meet the actual demand, and the plastic deformation of the parts is not sufficient. With the increase of the stretching degree, the stress formed by the material in the process of inflow i...

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Problems solved by technology

[0002] In the mold design of the high-strength steel plate beam parts of the automobile body, the drawing die generally uses the force of the air cushion ejector to realize the force source of the mold structure movement, the pressing force and the drawing force are always the same, and the drawing die generally The force of the air cushion ejector is used as the downward pressure source, and the blank holder force is constant during the forming process. The problem with the drawing die of this structure is that the forming force required by the part during the drawing process is gradually increased. , the constant blank holder force cannot meet the actual demand, and the plastic deformation of the parts is not sufficient. With the increase of the stretching degree, the stress formed by the material in the process of inflow increases, so the side wall of the girder will form an arc shape. Rebound defects cause unevenness of the side wall, and wrinkling of the binder surface, and the overall part is prone to distortion. It is difficult to completely solve this problem in subsequent plastic surgery

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