Numerical-control heating bending die and forming method for large-diameter thin-wall pure titanium tube

A technology for heating, bending and forming molds, applied in forming tools, manufacturing tools, metal processing equipment, etc., to achieve the effect of ensuring strength, reducing energy consumption, and improving lifespan

Active Publication Date: 2012-07-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency of the existing technology that it is difficult to carry out large-diameter thin-walled pure titanium tube numerically controlled heating and bending, and improve the ben

Method used

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  • Numerical-control heating bending die and forming method for large-diameter thin-wall pure titanium tube
  • Numerical-control heating bending die and forming method for large-diameter thin-wall pure titanium tube
  • Numerical-control heating bending die and forming method for large-diameter thin-wall pure titanium tube

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Experimental program
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Effect test

Embodiment 1

[0039] This embodiment is a thin-walled pure titanium tube numerical control heating bending forming mold.

[0040] The mold described in this embodiment is obtained by improving the prior art CNC room temperature bending forming mold and the CNC pipe bending machine mold for hot bending, including the pressure mold 3, the clamping mold 5, the insert 6, and the bending mold. 7. Anti-wrinkle mold 11 and core mold. The core mold includes a core rod 8 and a core ball 4. In this embodiment, a heating hole and a temperature measuring hole are added to the pressure die 3 and the core rod 8 respectively, and the diameter of the core rod 8 is optimized to meet the requirements for numerically controlled heating and bending of a thin-walled pure titanium tube with a small bending radius and a large diameter. The specific technical solution of this embodiment is:

[0041] One side surface of the pressure die 3 is a concave arc-shaped pressure die forming surface for matching with the outer...

Embodiment 2

[0061] This embodiment is a method for forming a thin-walled pure titanium tube by numerically controlled heating using the mold described in the first embodiment.

[0062] In this embodiment, the standard is SAEAMS4941E, and the 2008 specification is Φ50.8×t0.508, that is, a pure titanium tube with a diameter D of 50.8 mm and a wall thickness t of 0.508 mm. The pure titanium tube has a D / t= 100, the bending radius R=2D.

[0063] The specific implementation process includes the following steps:

[0064] In the first step, the mold and the pipe bender are insulated. Place the pressure mold heat insulation board 13 between the assembly surface of the pressure mold 3 and the machine tool connection surface, and place the crease mold heat insulation board 12 between the anti-wrinkle mold 11 and the machine tool connection surface. The wrinkle mold heat insulation board 12 realizes heat insulation between the mold and the pipe bender. The pressure mold heat insulation board 13 and the ...

Embodiment 3

[0079] The standard used in this embodiment is SAE AMS4941E, the 2008 specification is Φ76.2×t1.0668, that is, a pure titanium tube with a diameter D of 76.2mm and a wall thickness t of 1.0668mm. The D / t = 71.4, bending radius R = 2D.

[0080] The specific implementation process includes the following steps:

[0081] In the first step, the mold and the pipe bender are insulated. Place the pressure mold heat insulation board 13 between the assembly surface of the pressure mold 3 and the machine tool connection surface, and place the crease mold heat insulation board 12 between the anti-wrinkle mold 11 and the machine tool connection surface. The wrinkle mold heat insulation board 12 realizes heat insulation between the mold and the pipe bender. The pressure mold heat insulation board 13 and the anti-wrinkle mold heat insulation board 12 are made of fiber composite material heat insulation boards for stamping.

[0082] The second step is to assemble and debug the mold. The mold is ...

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Abstract

Disclosed are a numerical-control heating bending die and a forming method for a large-diameter thin-wall pure titanium tube. A plurality of pressure die heating holes are evenly distributed on the upper surface of a pressure die along the length direction of the pressure die, and a pressure die temperature measuring hole is arranged between each two adjacent pressure die heating holes. A plurality of mandrel heating holes and mandrel temperature measuring holes are circumferentially and evenly distributed on an end face of a mandrel, and one mandrel temperature measuring hole is positioned between each two adjacent mandrel heating holes. The pressure die heating holes and the mandrel heating holes are through holes, and the pressure die temperature measuring holes and the mandrel temperature measuring holes are blind holes. By determining a tube bending die, heat insulation of the die and a tube bender, bending speed, lubrication of the tube and the die, and heating and temperature control of the die, numerical-control heating bending of the thin-wall pure titanium tube with the diameter D larger than 40mm is realized, the problem of serious necking of the tube in a clamping area due to uneven heating temperature of the tube is avoided, excessive energy consumption for constant-temperature heating of the tube is reduced, the strength of a clamping end is ensured, and the bending yield of the tube is improved.

Description

Technical field [0001] The invention relates to the field of numerical control processing and forming of pipes, in particular to a numerical control heating bending forming die and a forming method for thin-walled pure titanium pipes with a diameter of D>40 mm. Background technique [0002] Bend pipe parts are now widely used in aviation, aerospace, automobile, energy and other industrial fields. The CNC pipe bending process is an advanced pipe bending forming technology produced by the traditional pipe bending process combined with numerical control technology. It can meet the requirements of high precision, high efficiency and digital processing of pipe bending, and it is occupied in high-tech fields such as aviation and aerospace. It has an important position and shows a broad application prospect. Thin-walled (tube diameter D / wall thickness t>20) pure titanium elbow fittings are light in weight and can withstand higher working pressures. They are used for fuel, air con...

Claims

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Application Information

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IPC IPC(8): B21D37/10B21D9/05B21D9/18
Inventor 杨合张志勇李恒王丹陶智君
Owner NORTHWESTERN POLYTECHNICAL UNIV
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