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Current-assisted roll forming method of difficult-to-deform material special-shaped section pipe fittings

A special-shaped cross-section and difficult-to-deform technology, applied in metal processing equipment, feeding devices, positioning devices, etc., can solve the problems of complex heating equipment, low heating efficiency, easy oxidation, etc., to save the process, improve processing performance, Reduce the effect of springback

Active Publication Date: 2019-03-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] To sum up, in view of the technical bottleneck in the manufacturing of special-shaped cross-section tubular parts such as titanium alloys, intermetallic compounds, and high-strength aluminum alloys, this invention proposes a method that not only simplifies the forming process, but also solves the problem of processing difficult-to-deform materials such as titanium alloys. A new method of current-assisted roll forming for problems such as low heating efficiency, easy oxidation, complex and expensive heating equipment during the process

Method used

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  • Current-assisted roll forming method of difficult-to-deform material special-shaped section pipe fittings
  • Current-assisted roll forming method of difficult-to-deform material special-shaped section pipe fittings
  • Current-assisted roll forming method of difficult-to-deform material special-shaped section pipe fittings

Examples

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Effect test

Embodiment 1

[0039] Example 1: For a titanium alloy with a mass percentage of Ti of 94.5%, a mass percentage of Al of 3%, and a mass percentage of V of 2.5%, the outer diameter of the original pipe fitting is 200mm, the wall thickness is 5mm, the length is 1100mm, the diameter of the middle roller is 40mm, and the rollers on both sides The diameter is 22mm, and the schematic diagram of the forming structure simulation is as follows Figure 7 shown. Place the original pipe 1 between the upper roller 3 and the lower roller 4 in the middle, insert the upper roller 3 into the pipe 1, adjust the height of the upper roller 3, and make the upper roller 3 and the lower roller 4 align the pipe 1 Clamping, then adjust the small rollers 8 and 9 on the left and right sides, so that the four rollers clamp the original pipe fittings in the left and right directions respectively. Closed circuit switch 7 makes the pulse current (current density 12A / mm) that AC power source 6 produces 2 ) flows through t...

Embodiment 2

[0040] Embodiment 2: For the Ti with composition Ti atomic percentage 53.5%, Al atomic percentage 22%, Nb atomic percentage 24%, Mo atomic percentage 0.5% 2 AlNb-based intermetallic compound, the outer diameter of the original pipe is 200mm, the wall thickness is 5mm, the length is 1100mm, the diameter of the middle roller is 40mm, and the diameter of the rollers on both sides is 22mm. Place the original pipe 1 between the upper roller 3 and the lower roller 4 in the middle, insert the upper roller 3 into the pipe 1, adjust the height of the upper roller 3, and make the upper roller 3 and the lower roller 4 align the pipe 1 Clamping, then adjust the small rollers 8 and 9 on the left and right sides, so that the four rollers clamp the original pipe fittings in the left and right directions respectively. The closed circuit switch 7 makes the pulse current (current density 10A / mm) produced by the AC power supply 6 2 ) flows through the switch 7, passes through the left roller sh...

Embodiment 3

[0041] Example 3: For a high-strength aluminum alloy with a composition of 86.05% by mass of Al, 8.9% by mass of Zn, 2.6% by mass of Mg, 2.3% by mass of Cu, and 0.15% by mass of Zr, the outer diameter of the original pipe fitting is 200 mm, and the wall thickness is 5 mm. The length is 1100mm, the diameter of the middle roller is 40mm, and the diameter of the rollers on both sides is 22mm. Place the original pipe 1 between the upper roller 3 and the lower roller 4 in the middle, insert the upper roller 3 into the pipe 1, adjust the height of the upper roller 3, and make the upper roller 3 and the lower roller 4 connect the pipe 1 Clamping, then adjust the small rollers 8 and 9 on the left and right sides, so that the four rollers clamp the original pipe fittings in the left and right directions respectively. Closed circuit switch 7 makes the pulse current (current density 30A / mm) that AC power source 6 produces 2 ) flows through the switch 7, passes through the left roller sh...

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Abstract

The invention discloses a current-assisted roll forming method of difficult-to-deform material special-shaped section pipe fittings, belongs to the technical field of difficult-to-deform metal material pipe part forming, and particularly relates to a forming method of the difficult-to-deform material special-shaped section pipe fittings, such as titanium alloy, Ti2AlNb-based intermetallic compounds, and high-strength aluminum alloy. The current-assisted roll forming method of the difficult-to-deform material special-shaped section pipe fittings aims to solve the problems of difficult forming,complex and expensive equipment, low efficiency and great energy consumption of existing pipe difficult-to-deform material special-shaped section pipe fittings. The method comprises the steps of introducing current with a certain frequency into difficult-to-deform metal, improving the plastic deformation performance of the materials, reducing flow stress, and facilitating plastic processing. A forming device required by the forming method is of a composite structure similar to four-axis roll bending and bending, V-shaped angular sections with different angles are obtained by changing the displacement of top and bottom roller shafts in the vertical direction, and the pipe fitting with a certain sectional shape is obtained by continuous processing at different angles. The current-assisted roll forming method of the difficult-to-deform material special-shaped section pipe fittings has the advantages of easy automatic control, high efficiency, low cost, high forming quality, and capabilityof processing pipe fittings with different sectional shapes.

Description

technical field [0001] The invention belongs to the technical field of forming pipe parts made of difficult-to-deform metal materials, and specifically relates to a pipe fitting of difficult-to-deform materials that is processed and formed by using the electroplastic effect through a combination of multi-axis rolling and bending to obtain a special-shaped cross-section. Methods for pipe parts. Background technique [0002] Pipe parts are a very important type of parts in mechanical parts, which have the characteristics of various materials, complex shapes, and various forming methods. With the use and development of pipe parts, higher requirements are put forward for the performance of pipe parts, such as: light weight, high strength, and certain temperature resistance. Materials such as titanium alloys, intermetallic compounds and high-strength aluminum alloys have excellent properties such as low density and high specific strength, and their formed components can also be ...

Claims

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Application Information

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IPC IPC(8): B21D7/08B21D7/16B21D43/00
CPCB21D7/08B21D7/16B21D43/003
Inventor 汤泽军黄云龙刘钢
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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