Multistage continuous large deformation part internal high-pressure forming method and device

Abstract

The invention discloses a multistage continuous large deformation part internal high-pressure forming method and device. The multistage continuous large deformation part internal high-pressure forming device comprises a preforming mold, at least one subsequent forming mold, a left feeding plunger chip, a right feeding plunger chip, a left liquid inlet and a right liquid inlet. The multistage continuous large deformation part internal high-pressure forming method comprises the following steps of: firstly putting an initial pipe billet in the preforming mold, filling high-pressure liquid into the metal pipe billet through a port sealing device, and pushing the left feeding plunger chip and the right feeding plunger chip under the effect of a horizontal cylinder; carrying out preliminary bulging on a material located in the middle under the coordination effect of axial thrust and liquid pressure, wherein the bulging height of the material is 85%-95% of the bulging height of a forming part, and taking out a middle blank after unloading; secondly, putting the middle blank in the subsequent forming mold, and bulging bulged adjacent positions of the middle blank; and carrying out bulging in sequence from the middle to two ends till obtaining a final forming part.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing of metal hollow components, in particular to an internal high-pressure forming method and device for multi-stage continuous large-deformation parts. Background technique [0002] Realizing the lightweight of automobiles is an important research content of the modernization of automobile products. In addition to the use of lightweight alloy materials, another way to reduce the weight of automobiles is to "replace solids with empty space" and strong components such as variable cross-sections. Multi-stage continuous large deformation parts represented by four-section tubes are important components of automobiles and are widely used in the automobile industry. They are of great significance for optimizing automobile production processes, improving production efficiency and reducing production costs. Compared with stamping welding or mechanical processing technology, the advantages of us...

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Problems solved by technology

[0006] The existing internal high pressure forming method is generally difficult to solve the forming problem of multi-stage continuous large deformation parts. The present invention aims at the drawbacks of the existing methods and proposes a new internal high pressure forming method and device for multi-stage continuous large deformation parts.

[0007] Multi-stage continuous large-deformation parts with uniform wall thickness and excellent performance are prepared by bulging first in the middle and then at both ends, which effectively solves the problems of difficult feeding of multi-stage continuous large-deformation parts and accumulation of nozzle materials in practical applications.

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