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Composite punch device for forming of iso-wall-thickness multi-way tubes and forming method

A technology of equal wall thickness and pipe fittings, which is applied in the field of metal hollow member manufacturing, can solve the problems of thickening in the middle of the main pipe, the inability to obtain multi-way pipe fittings with uniform wall thickness, and the inability to reduce the accumulation of hydraulic bulging pipe materials and reduce the wall thickness, etc., to achieve The effect of increasing the height of the branch pipe, simple and efficient forming method, and improving the uniformity of wall thickness

Active Publication Date: 2014-07-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, hydraulic bulging is a common method for manufacturing multi-way pipe fittings, but in the process of bulging, there are mainly the following defects: (1) The middle part of the main pipe of multi-way pipe fittings is seriously thickened
This method uses a compound punch, which is low in cost, easy to operate, and reduces the booster device, but it cannot reduce the material accumulation in the middle of the main pipe of the hydraulic bulging pipe fitting and overcome the thinning of the wall thickness at the top of the branch pipe during the bulging process. Unable to obtain multi-way fittings with uniform wall thickness

Method used

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  • Composite punch device for forming of iso-wall-thickness multi-way tubes and forming method
  • Composite punch device for forming of iso-wall-thickness multi-way tubes and forming method
  • Composite punch device for forming of iso-wall-thickness multi-way tubes and forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the first step, a 304 stainless steel tube blank 5 with a length of 300mm, a diameter of 50mm and a wall thickness of 2mm is placed in the tee mold 6, and the upper and lower molds are closed;

[0028] In the second step, the above-mentioned left and right composite punches are loaded into the blank tube 5 from the left and right ends of the blank tube 5 respectively, and the tops of the liquid-filled mandrels 4 in the left and right composite punches are brought into contact;

[0029] In the third step, the left and right ends of the 304 stainless steel tube blank 5 are sealed, and high-pressure liquid is injected through the left and right two liquid-filled core rods 4;

[0030] The fourth step is to use hydraulic cylinders to push the feed punch 3 of the left and right compound punches to realize axial feeding, and to control the liquid pressure through the left and right two liquid filling mandrels 4 to realize the axial advance Real-time control of internal pressure;

...

Embodiment 2

[0032] In Example 2, a 304 stainless steel tube blank with a length of 300 mm, a diameter of 50 mm, and a wall thickness of 2 mm and a low-carbon steel tube blank with a length of 300 mm, a diameter of 54 mm and a wall thickness of 2 mm were explosively compounded into composite tube blanks for hydraulic expansion. The other steps are the same as in Example 1.

Embodiment 3

[0033] In Example 3, a low-carbon steel pipe blank with a length of 400 mm, a diameter of 40 mm, and a wall thickness of 2 mm was used as the hydro-expanded original tube blank, and a six-way pipe fitting was formed by a six-way die. The other steps are the same as those in the first embodiment.

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Abstract

The invention discloses a composite punch device for forming of iso-wall-thickness multi-way tubes, and belongs to the technical field of manufacture of metal hollow members. The composite punch device comprises feed punches. The feed punches are assembled coaxially with liquid filling core rods, and are sequentially connected with guide blocks and hydraulic cylinders. A plurality of liquid guide rings are arranged on each liquid filling core rod. The liquid guide rings are communicated with liquid inlets of the guide blocks. Sealing rings are arranged between the feed punches and the liquid filling core rods. The feed punches can axially move along the liquid filling core rods. The invention further discloses a forming method for the iso-wall-thickness multi-way tubes. Stacking of materials in the middle of a tube blank is effectively reduced, so that wall thickness evenness of the multi-way tubes, especially main tubes, is greatly improved; the composite punch device is simple in structure and convenient to operate, and the forming method is simple and effective; maximum reduction ratio of the wall thickness of the multi-way tubes is smaller than 10%, and the height of each branch tube is more than twice of the diameter of each main pipe.

Description

technical field [0001] The invention relates to a composite punch device and a forming method for forming multi-way pipe fittings, in particular to a composite punch device and a forming method for forming multi-way pipe fittings with equal wall thickness, and belongs to the technical field of metal hollow member manufacturing. Background technique [0002] Three-way, four-way, six-way and other multi-way pipe fittings play an important role in diverting flow, changing the flow direction of liquid, and relieving local stress of the piping system in aviation, aerospace, nuclear power and petrochemical piping systems. At present, hydraulic bulging is a common method for manufacturing multi-way pipe fittings, but it mainly has the following defects in the bulging process: (1) The middle part of the main pipe of multi-way pipe fittings is seriously thickened. The conventional hydraulic bulging process requires large-scale feeding. Although the material at both ends of the main p...

Claims

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Application Information

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IPC IPC(8): B21D26/033B21D26/041
Inventor 陶杰郭训忠范敏郁徐翌伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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