Method for forming flange at any position of pipe in progressive thickeningmode

A flange and pipe technology, which is applied in the field of progressively thickening forming flanges at any position in the axial direction of the pipe, can solve problems such as increasing the amount of deformation, and achieve the effect of preventing distortion or filling dissatisfaction, improving the forming limit and improving the forming efficiency.

Active Publication Date: 2020-06-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a method for progressively thickening the flange at an...

Method used

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  • Method for forming flange at any position of pipe in progressive thickeningmode
  • Method for forming flange at any position of pipe in progressive thickeningmode
  • Method for forming flange at any position of pipe in progressive thickeningmode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 , image 3 and Figure 4 As shown, in this embodiment, the flange thickening is formed at the end of the pipe fitting 3, and the specific position is the upper nozzle h of the pipe fitting 3 e Section, specifically provide constant pressure F through external hydraulic equipment c , and use the compression molding device with workbench 6, 7 to carry out upsetting processing on the pipe fitting 3, and set the stroke S of the workbench according to the size of the flange to be formed m , so that the table moves at a constant speed V p Drive the compression molding device, as the mandrel 4 goes up, the pipe fitting 3 is gradually squeezed into the forming cavity from the positioning cavity, and the side wall of the pipe fitting 3 is gradually thickened until the stroke ends to form a flange.

[0025] The compression molding device includes: a reverse top punch 1, a die 2 and a mandrel 4, wherein: the reverse top punch 1 is slidably matched with the die...

Embodiment 2

[0034] Such as figure 2 , image 3 and Figure 4 As shown, in this embodiment, the flange thickening is formed in the middle of the pipe fitting 3, and the specific thickening position is h from the upper nozzle of the pipe fitting 3 d place. Compared with Embodiment 1, the reverse punch 1 of this embodiment has added a positioning structure 11, so the closed cavity where the pipe fittings are located can be divided into three parts. The specific conditions are as follows:

[0035] The reverse top punch 1 with the positioning structure is as image 3 As shown in b, the height of the positioning structure is h c and satisfy h c =h d , with a width of t c and satisfy t c = t 0 .

[0036] The closed cavity includes in turn: a forming cavity 10, a protective cavity 8 and a positioning cavity 9, wherein: the diameter of the forming cavity 10 is the same as the outer diameter of the flange, and the diameter of the protective cavity 8 is the same as the outer diameter of t...

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Abstract

The invention discloses a pipe based flange thickening implementation method. The method is characterized in that back pressure is applied to a reverse ejection male die, and a core rod is arranged tomove upwards at a constant speed, so that upsetting and extruding treatment is performed on a pipe, the portion, located in a protection cavity, of a pipe material is gradually extruded into a forming cavity along with gradual increase of deformation force inside the pipe, the portion, in the forming cavity, of the side wall of the pipe is thickened in an accumulated mode accordingly, and finallythe flange is formed. According to the method, the side wall material is gradually accumulated for forming so that the defects of pipe wall twisting or incomplete filling and the like can be effectively overcome, and flange thickening forming limit and forming efficiency are improved; and a positioning cavity is additionally formed in the male die, one-time forming of the flange at any position of the pipe wall is achieved, and the process application range is widened.

Description

technical field [0001] The invention relates to a technique in the field of plastic forming of metal materials, in particular to a process method for progressively thickening and forming a flange at any position in the axial direction of a pipe. Background technique [0002] As an indispensable part in industrial production, pipes are widely used in metallurgy, chemical industry and automobile industry. In order to achieve special functions, pipes often have different wall thicknesses in the axial direction, and the most typical feature is the flange feature. For the flange features at the end, the upsetting method is often used. Due to the limitation of the height-to-diameter ratio of the upsetting part, the amount of upsetting deformation is small; for the flange features in the middle, the direct upsetting method is often used, and different molds are designed. The cavity achieves the purpose of thickening the pipe wall, but this type of forming method is limited by the ...

Claims

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Application Information

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IPC IPC(8): B21C23/02B21C25/02
CPCB21C23/02B21C25/02
Inventor 庄新村朱圣法朱印肖思雨赵震
Owner SHANGHAI JIAO TONG UNIV
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