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Pipe bulging method and die based on volume expansion force

A volume expansion, pipe technology, applied in forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of unsuitability for new products, long development cycle, complex control system, etc., to shorten the trial production cycle and reduce development costs.

Active Publication Date: 2018-11-06
DONGFENG MOTOR CORP HUBEI
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Problems solved by technology

At present, the existing internal high pressure uses hydraulic oil plus axial feed to realize pipe bulging, which requires a large-tonnage hydraulic press, which requires high sealing performance of the system, and the control system is complex, with high production costs and long development cycles ( The trial production cycle is generally about 6 months), obviously, the existing internal high pressure forming is too large a one-time investment, which is not suitable for the development of new products. How to shorten the development cycle of tube bulging and reduce the cost of trial production is the problem to be solved in product trial production one

Method used

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  • Pipe bulging method and die based on volume expansion force
  • Pipe bulging method and die based on volume expansion force
  • Pipe bulging method and die based on volume expansion force

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0028] Such as figure 1 As shown, the present invention is a pipe bulging method based on volume expansion force, including: filling the sealed pipe with water, cooling the water to freeze, and expanding the pipe into the required shape under the guidance of the cavity of the mold.

[0029] The specific steps are:

[0030] (1) Fill the pipe with room temperature water in advance, and seal both ends, see figure 1 In step a;

[0031] (2) Put the pipe pre-filled with normal temperature water into the mold with a cavity, the mold is closed, and cooled. During the cooling process, the water slowly freezes, and the resulting volume bulging force bulges the pipe , see figure 1 In steps b, c, d, e;

[0032] (3) After the pipe expands...

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Abstract

The invention relates to a pipe bulging method and die based on volume expansion force and belongs to the technical field of the production technology of auto spare parts. The pipe bulging method comprises the following steps: filling water in a sealed pipe, cooling to freeze the water, and expanding the pipe into a demanded shape under the guidance of the cavity of the die. With adoption of the pipe bulging method, the sealing requirement of equipment and the requirement of a high pressure liquid source to pipe expansion are lowered, the trial-manufacture period is shortened and the development cost is lowered.

Description

technical field [0001] The invention relates to the technical field of auto parts production technology, in particular to a pipe bulging method based on volume expansion force and a mold. Background technique [0002] Lightweight is the main direction for the future development of automobiles, and tube bulging is one of the effective ways to achieve lightweight automobiles. In the prior art, in order to achieve a specific shape, the splicing of pipes is mainly through welding, sleeve, etc., and the quality of the welds is increased. Therefore, the quality of the welds can be reduced through the expansion of the pipes to achieve the purpose of light weight. The pipe bulging is also called internal High-pressure forming, internal high-pressure forming realizes the lightweight of automobiles by replacing solid parts with hollow parts, replacing equal parts with variable cross-sections, and replacing tailor-welded parts with integral forming. At present, the existing internal h...

Claims

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Application Information

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IPC IPC(8): B21D26/00B21D37/10B21D37/16
Inventor 张亚岐高方勇胡文治周鹏穆传坤阮楹妍
Owner DONGFENG MOTOR CORP HUBEI
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