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

A technology of internal high pressure forming and large deformation, which is applied in the field of advanced manufacturing of metal hollow components, can solve problems such as feeding difficulties, forming problems of multi-stage continuous large deformation parts, accumulation of nozzle materials, etc. The method is simple and feasible, and the effect of uniform wall thickness

Active Publication Date: 2016-06-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Effect test

Embodiment 1

[0036] refer to figure 1 , figure 2 , In this embodiment, the stainless steel pipe fittings with four projections are formed, the two projections in the middle are formed first, and then the two projections on both sides are formed.

[0037] In the first step, put the 304 stainless steel tube blank with a length of 300mm, a diameter of 50mm, and a wall thickness of 2mm into the preforming mold, and the upper and lower molds are closed. The preforming mold has a cavity corresponding to the two protrusions in the middle of the formed part ;

[0038] The second step is to seal the left and right ends of the 304 stainless steel tube blank, and inject high-pressure liquid (water) through the left and right liquid inlets;

[0039] The third step is to use the hydraulic cylinder to push the left and right two feed punches to realize axial feeding, and the height of the two protrusions in the middle is 85%-95% of the protrusion height of the formed part, and the pressure is maintai...

Embodiment 2

[0044] In this embodiment, a stainless steel pipe fitting with three protrusions is formed, and one protrusion in the middle is formed first, and then two protrusions on both sides are formed.

[0045] In the first step, the 304 stainless steel tube blank with a length of 300mm, a diameter of 50mm, and a wall thickness of 2mm and a low-carbon steel tube blank with a length of 300mm, a diameter of 52mm, and a wall thickness of 2mm are exploded and composited to form a composite tube blank, which is put into a preforming mold, and the upper and lower molds Clamping;

[0046]The second step is to seal the left and right ends of the carbon steel / stainless steel bimetal composite tube blank, and inject high-pressure liquid through the left and right liquid inlets;

[0047] The third step is to use the hydraulic cylinder to push the left and right two feed punches to realize axial feeding, and the height of a convex in the middle is 85%-90% of the convex height of the formed part, a...

Embodiment 3

[0052] In this embodiment, the stainless steel pipe fittings with six protrusions are formed. First, the two protrusions in the middle are formed, and then the two protrusions next to the two sides of the middle protrusion are formed, and finally the two outermost protrusions are formed.

[0053] The first step is to put a low carbon steel tube blank with a length of 400mm, a diameter of 40mm and a wall thickness of 2mm into the preforming mold, and the upper and lower molds are closed;

[0054] The second step is to seal the left and right ends of the low-carbon steel billet, and inject high-pressure liquid through the left and right liquid inlets;

[0055] The third step is to use the hydraulic cylinder to push the left and right two feed punches to realize axial feeding. The height of the two protrusions in the middle is 90%-95% of the protrusion height of the formed part, and the pressure is maintained ( 3-5 minutes);

[0056] The fourth step is to release the pressure, o...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/033B21D26/047
CPCB21D26/033B21D26/047
Inventor 郭训忠陶杰郭群
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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