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A titanium tube numerical control differential temperature heating bending forming mold and method

A technology of differential temperature heating and bending forming, applied in forming tools, manufacturing tools, metal processing equipment, etc., can solve the problem of difficult-to-form titanium alloy tube CNC heating and bending forming, which is not conducive to improving the bending and forming quality/forming limit, temperature It can improve the quality of bending, avoid temperature unevenness, and improve the forming limit.

Active Publication Date: 2017-10-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this mold design method is mainly aimed at pure titanium tubes, and the working temperature is 200-300°C, so it is difficult to carry out CNC heating and bending of titanium alloy tubes that are difficult to form at higher temperatures
At the same time, due to the "heat sinking" effect of the bending die and the heat transfer of the mandrel to the core ball, the temperature at the front end of the mandrel is low, which makes the difference between the temperature distribution in the bending area of ​​the pipe and the reasonable temperature distribution of hot bending, which is not conducive to improving the quality of the titanium tube. Bending forming quality / forming limit

Method used

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  • A titanium tube numerical control differential temperature heating bending forming mold and method
  • A titanium tube numerical control differential temperature heating bending forming mold and method
  • A titanium tube numerical control differential temperature heating bending forming mold and method

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Embodiment 1

[0050] This embodiment is a titanium tube numerically controlled differential temperature heating bending forming die.

[0051] The titanium tube numerical control heating bending forming mold proposed by the present invention includes a pressure mold 3, a clamping mold 9, an insert 12, a bending mold 14, an anti-wrinkle mold 18, a core mold, a pressure mold heat insulation plate 4, and a clamping mold heat insulation Plate 11, bending mold heat insulation board 17 and anti-wrinkle mold heat insulation board 21; the core mold includes mandrel 5 and core ball 8. In this embodiment, heating holes and temperature measuring holes are respectively added on the pressure mold 3, the bending mold 14, the mandrel 5 and the anti-wrinkle mold 18, and the temperature measuring holes are added on the clamping mold 9 and the insert 12, so as to meet the requirements of titanium Tube CNC heating bending requirements. In the present invention, cooling holes 22 are added to the heat insulatio...

Embodiment 2

[0072] This embodiment is a method of bending and forming a titanium tube by using the mold described in the first embodiment to heat and bend it.

[0073] What this embodiment adopts is the CP-3 pipe material whose specification is Φ76.2×t1.0668, that is, the pure titanium pipe whose pipe diameter D is 76.2 mm and whose wall thickness t is 1.0668 mm. The D / t of the pure titanium pipe is 71.4 , Bending radius R = 1.5D. The equipment used in this embodiment is W27YPC-159 CNC pipe bender.

[0074] The specific implementation process includes the following steps:

[0075] The first step is the heat insulation of the mold and the pipe bender. Place the pressure mold heat insulation board 4 between the assembly surface of the pressure mold 3 and the machine tool connection surface, place the anti-wrinkle mold heat insulation board 21 between the anti-wrinkle mold 18 and the machine tool connection surface, and connect the bending mold 14 assembly surface with the machine tool Pl...

Embodiment 3

[0095] What this embodiment adopts is the TC4 pipe with specification of Φ60×t1, that is, the titanium alloy pipe with diameter D of 60mm and wall thickness t of 1mm. The titanium alloy pipe has D / t=60 and bending radius R=3D.

[0096] The specific implementation process includes the following steps:

[0097] The first step is the heat insulation of the mold and the pipe bender. Place the pressure mold heat insulation board 4 between the assembly surface of the pressure mold 3 and the machine tool connection surface, place the anti-wrinkle mold heat insulation board 21 between the anti-wrinkle mold 18 and the machine tool connection surface, and connect the bending mold 14 assembly surface with the machine tool Place the bending mold heat insulation board 17 between the surfaces, and place the clamping mold heat insulation board 11 between the assembly surface of the clamping mold 9 and the connecting surface of the machine tool; on the upper and lower surfaces of the pressure...

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Abstract

The invention discloses a numerical control differential heating bending forming mould for a titanium tube and a method. The numerical control differential heating bending forming mould for the titanium tube is characterized in that heating holes and thermometer holes are formed in a pressure mould, a bending mould, a mandril and a crease-resistant mould respectively; and thermometer holes are formed in a clamping mould and an insert block; the pressure mould, the mandril, the bending mould and the crease-resistant mould are heated, and the heating temperatures are set according to tube hot bending simulated reasonable temperature distribution. Compared with the prior art, the moulds and the tube can be heated to the set temperatures faster, the heating efficiency of the tube is improved, temperature nonuniformity is avoided, the bending forming quality and forming limit of a titanium alloy tube are further improved and increased, and a machine tool is protected by a heat insulating plate. After the tube is bent within the forming limit, the inner side of the tube does not crease, the surface of the tube has no scratch, a reduction rate of the wall thickness of the outer side of the tube is less than 17%, and a section flattening rate of the tube is less than 5.0%, so that the requirements of an airplane on a small-bending-radius elbow tube made of major-diameter thin-wall pure titanium tube can be met.

Description

technical field [0001] The invention relates to the field of numerically controlled processing and forming of pipe materials, in particular to a method for bending and forming titanium pipes by numerically controlled differential temperature heating and a mold. Background technique [0002] CNC pipe bending technology is an advanced pipe bending forming technology produced by combining traditional pipe bending technology with numerical control technology. It can meet the requirements of high precision, high efficiency and digital processing for pipe bending parts. It occupies a leading position in high-tech fields such as aviation and aerospace. important position and shows broad application prospects. Titanium alloy elbow fittings are light in weight and can withstand high working pressure. They are used in pipeline systems such as fuel oil and air conditioning, and can meet the urgent needs of advanced aircraft development for high performance, light weight and high effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D9/18B21D9/08B21D9/03B21D37/18
CPCB21D9/03B21D9/08B21D9/18B21D37/18
Inventor 杨合李恒杨恒马俊陶智君张志勇韩瑞李龙刘碧颖
Owner NORTHWESTERN POLYTECHNICAL UNIV
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