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Medium forming method for improving forming property of thick-wall metal pipe fittings

A technology for metal pipe fittings and formability, which is applied in the field of medium forming to improve the formability of thick-walled metal pipe fittings. It can solve the problems of poor working environment, complicated filling process, and long production cycle, and achieve low production costs, no depressions on the pipe wall, and Make simple effects

Inactive Publication Date: 2013-06-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the obstacle that the hollow forging mold core is difficult to take out, and can be used to make high-strength hollow metal parts. However, the filling process of this method is complicated, the production cycle is long, and it is only suitable for small batch production, and the filling medium used needs to be Hardens at lower temperatures, poorer working conditions

Method used

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  • Medium forming method for improving forming property of thick-wall metal pipe fittings
  • Medium forming method for improving forming property of thick-wall metal pipe fittings
  • Medium forming method for improving forming property of thick-wall metal pipe fittings

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Embodiment approach 1

[0041] Combine below figure 1 and figure 2 This embodiment will be specifically described. This embodiment is to figure 1 The shown straight tube blank 2 is pressed and formed as figure 2 As shown in the bent pipe fitting 6, the straight pipe blank 2 in this embodiment is an aluminum alloy 6061-T651 with a yield strength of 275MPa, a melting point range of 580-650°C, a diameter of the pipe blank 2 of 76mm, and a wall thickness of 6mm.

[0042] For thick-walled metal pipes such as aluminum alloys and magnesium alloys with low strength, the requirements for the compression resistance of the composite medium 3 filled in the pipes are not high, and bismuth-based or tin-based low-melting point alloys can be used as fusible alloys. The bismuth-based low melting point alloy includes 50.6% Bi, 26.9% Pb, 12.5% ​​Sn, and 10% Cd, with a strength of 42.1MPa and a melting point of 70°C. The tin-based low melting point alloy includes 85.4% Sn, 14.6% Bi, its strength is 85MPa, and its ...

Embodiment approach 2

[0052] Combine below image 3 and Figure 4 This embodiment will be specifically described. In this embodiment, the 35# carbon steel pipe with high strength is used, the yield strength is 315MPa, the diameter-thickness ratio is 12.8, and the steel pipe with the diameter-thickness ratio less than 20 is called a thick-walled pipe, which requires a composite medium that can withstand relatively high pressure. .

[0053] In this embodiment, steel balls with a diameter of 4 mm are solidified with a zinc-based low-melting point alloy, and the two are uniformly mixed at a ratio of 1:1. The zinc-based low melting point alloy includes 92.4%Zn, 4%Al, 3.5%Cu, 0.1%Mg, with a strength of 194MPa and a melting point of 380°C.

[0054] This embodiment is to image 3 The shown straight tube billet 2 is pressed and formed as Figure 4 As shown in the square pipe fitting 6 , the forming device includes an upper mold cavity 1 , a lower mold cavity 4 , a tube blank 2 and a composite medium 3 ...

Embodiment approach 3

[0061] Combine below Figure 5 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 and Embodiment 2 is that the processing steps of the parts are reduced, that is, two bendings and partial flattening are completed at one time, and the manufactured pipe fitting 6 is a special-shaped cross-section pipe, and the cross-sectional shape includes: Round, square and oval. The method of the present invention is applicable to any pipe 6 whose cross-section is a closed curve profile shape. In this embodiment, the properties of the material of the tube blank 2 and the composite medium 3 filled therein are the same as those in the first embodiment. refer to Figure 5 , The forming device includes a tube blank 2, an upper mold cavity 1, a lower mold cavity 4, a composite medium 3 and a sealing plug 5.

[0062] The forming steps are as follows:

[0063] S1, uniformly mixing fusible alloy and steel ball at a ratio of 1:1 to form composi...

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Abstract

The invention relates to a medium forming method for improving the forming property of thick-wall metal pipe fittings. The method comprises the following steps: S1, preparing composite medium, namely, granular medium is uniformly mixed with fusible alloy under molten state, wherein the melting point of the fusible alloy is lower than the melting temperatures of a tube blank and the granular medium; S2, filling composite medium, namely, a fluid-shaped composite medium is filled in a hollow tube blank and then cooled until the composite medium is solidified; S3, forming pipe fittings; and S4, taking out the granular medium, namely, the solidified fusible alloy in a pipe is converted into molten fusible alloy, so that the molten fusible alloy drives the granular medium to be separated from the pipe fittings. The invention overcomes the defects that when the traditional rigid mould method is used for thick-wall metal pipe fitting forming, good forming quality is hard to achieve, avoids multi-step molding of metal pipe fittings, greatly saves the die cost, shortens the production period, and achieves the purpose of environmental-friendly and rapid production.

Description

technical field [0001] The invention relates to a plastic forming method for thick-walled metal pipe fittings, more specifically, to a medium forming method for improving the forming performance of thick-walled metal pipe fittings. Background technique [0002] In the traditional rigid die forming method of metal pipe fittings, due to the hollow feature of the pipe fittings, it is difficult to form at one time, and multiple molds are required, so the cost is high, the production cycle is long, and the pipe fittings are prone to wall thickness reduction, outer wall concave, Defects such as cross-sectional distortion, product quality cannot be guaranteed. In order to avoid or reduce the occurrence of quality defects, mandrels are often used in production or the method of filling pressure-bearing media in pipe fittings. When using a mandrel, more precise process parameters are required, and the cost is high. For filling the pressure medium in the pipe, it is generally divided...

Claims

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Application Information

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IPC IPC(8): B21D31/00
CPCB21D9/08B21D9/15
Inventor 王华君田梦芸杜建忠谢冰鲁建飞徐德鑫李秋
Owner WUHAN UNIV OF TECH
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