A small bellows tube blank hydroforming process and special forming die

A technology of hydroforming and bellows, which is applied in the directions of forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of the length of the expansion, the inability to guarantee the forming accuracy of the tube blank, and the difficulty in achieving the ideal processing effect, and achieve the purpose of improving the service life. Effect

Inactive Publication Date: 2016-08-03
CHONGQING FANCHENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 2 The shown small bellows has a small wave depth and a short single-wave expansion length. Generally, the single-wave forming process is used, but when encountering a bellows with a small absolute size, it will be difficult to achieve the ideal if the traditional hydroforming process is used. processing effect
First of all, it is necessary to use a forming die with extremely thin thickness; secondly, the tube blank is not easy to deform and bulge after being pressed because the length of the single wave expansion is too short; finally, because the wave depth is too small, the forming accuracy of the processed tube blank cannot be guaranteed.

Method used

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  • A small bellows tube blank hydroforming process and special forming die
  • A small bellows tube blank hydroforming process and special forming die
  • A small bellows tube blank hydroforming process and special forming die

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Embodiment Construction

[0026] according to Figure 4 , Figure 5 As shown, a small stainless steel bellows hydroforming process with an inner diameter of 51 mm, a wave depth of 1.5 mm, and a single wave expansion length of 2.5 mm is as follows:

[0027] 1) Clean the workbench of the molding press, clean the molding mold with gasoline and install it. The installation sequence from top to bottom is upper sealing cover 1, 11mm thick molding pad 3, molding die 5, 11mm thick Form pad 3 and lower sealing cover 7. Wherein the molding die sheet 5 is assembled by inner ring 51 and outer ring 52;

[0028] 2) Put the 0.25mm thick SUS304 stainless steel corrugated pipe blank 6 into the forming mold, and seal the mold;

[0029] 3) Press the upper sealing cover 1 and the lower sealing cover 7 so that a completely sealed airtight space can be formed between the upper sealing cover 1, the bellows tube blank 6 and the lower sealing cover 7, and inject hydraulic oil 8 into the unformed bellows In the tube blank 6...

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Abstract

The invention discloses a small-sized corrugated pipe blank hydraulic forming process. Firstly, the forming mold is installed, and the unformed bellows The tube blank is placed in the mold and the mold is sealed. Compress the upper sealing cover and the lower sealing cover, inject hydraulic oil into the unformed tube blank until the hydraulic oil fills the space between the upper sealing cover, the inner wall of the tube blank and the lower sealing cover. Then the forming press starts to pressurize continuously, and the tube blank is deformed and bulged by the pressure, and then the pressure is released. Remove the forming pad, pressurize, and at the same time the main oil cylinder of the forming press advances, and the two ends of the bellows blank are flanged and deformed to release the pressure. Finally, the forming die is replaced with a thin pad, and the main oil cylinder of the forming press is pushed forward without pressurization, so that the corrugated part in the middle of the corrugated pipe blank is deformed. After the completion, the forming mold is removed, and the formed corrugated pipe blank is taken out.

Description

technical field [0001] The invention relates to a hydroforming process, in particular to a hydroforming process for a small corrugated pipe blank with small wave depth and short single wave expansion length and a special forming mold piece. Background technique [0002] Half of the difference between the length of the outer diameter and the length of the inner diameter of the bellows is the wave depth, and the length of the corrugations between adjacent wave troughs after fully stretching is a single wave expansion. Such as figure 1 As shown, the ordinary corrugated pipe has a large wave depth and a long single wave expansion length. When the traditional hydroforming process is used to process the tube blank, it requires less pressure and is easy to bulge, so it is easy to form during processing. Ordinary corrugated pipes mostly adopt the multi-wave one-time molding method. After adjusting the relative position of the mold and the pipe blank, pressurize the inner cavity of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D15/10B21D37/00
Inventor 杨向东
Owner CHONGQING FANCHENG TECH
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