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Three-dimensional free forming device and method based on current auxiliary heating

A technology of auxiliary heating and electric current, applied in the field of three-dimensional free forming device based on electric current auxiliary heating, can solve the problems of surface wrinkling and cross-section distortion, and achieve the effect of increasing plasticity, reducing forming difficulty and improving quality

Active Publication Date: 2022-04-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, three-dimensional free bending adopts cold forming, and defects such as surface wrinkling and cross-sectional distortion will appear when bending pipes

Method used

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  • Three-dimensional free forming device and method based on current auxiliary heating
  • Three-dimensional free forming device and method based on current auxiliary heating
  • Three-dimensional free forming device and method based on current auxiliary heating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Before the bending of 304 stainless steel pipes, the thermal-electrical coupling model in ABAQUS software is used to simulate the distribution of temperature and electric field during bending, and the mapping relationship between current parameters and pipe materials is established; at the same time, the eccentricity is 1mm, The temperature and potential changes at 2mm, 3mm, 4mm, 5mm... are simulated, and the mapping relationship between current parameters and pipe eccentricity is established.

[0026] The process analysis is carried out for 304 stainless steel pipes, and the eccentricity U=10mm when the bending radius R=75mm is obtained. According to the simulation results before bending, the current parameters required for the heating and forming of 304 stainless steel pipes are obtained;

[0027] Import the process parameters into the three-dimensional free bending forming system, and set the preset value of the infrared sensor to 630°C;

[0028] Power on the curren...

Embodiment 2

[0032] Before the bending of TC4 titanium alloy pipe, the thermal-electric coupling model in ABAQUS software is used to simulate the distribution of temperature and electric field during bending, and the mapping relationship between current parameters and pipe materials is established; at the same time, the eccentricity is 1mm , 2mm, 3mm, 4mm, 5mm... to simulate the temperature and potential changes, and establish the mapping relationship between the current parameters and the eccentricity of the pipe.

[0033] The process analysis is carried out for the TC4 titanium alloy pipe, and the eccentricity U=12mm when the bending radius R=75mm is obtained. According to the simulation results before bending, the current parameters required for TC4 titanium alloy pipe heating and forming are obtained;

[0034] Import the process parameters into the three-dimensional free bending forming system, and set the sensor preset value to 700°C;

[0035] Apply current to the current-assisted he...

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Abstract

The invention discloses a three-dimensional free forming device and method based on current auxiliary heating, the three-dimensional free forming device comprises a pipe clamping mechanism for clamping a to-be-formed pipe fitting, the right end of the pipe clamping mechanism is provided with a pushing mechanism for pushing the end part of the pipe fitting, the pushing mechanism is provided with an insulating layer for being matched with the pipe fitting, and the insulating layer is arranged on the right end of the pipe clamping mechanism. A guide mechanism used for guiding a pipe fitting is arranged on the other side of the pipe clamping mechanism, and a bending die used for being matched with the pipe fitting and bending the pipe fitting is arranged at the outlet end of the guide mechanism in a matched mode. The heating power consumption is large, and the heating time is long.

Description

technical field [0001] The invention belongs to the technical field of flexible forming and manufacturing of metal pipe construction, in particular to a three-dimensional free forming device and method based on current-assisted heating. Background technique [0002] The emergence of three-dimensional free bending technology breaks the technical limitations of the traditional bending technology, which has a single bending direction and cannot form complex components, and realizes moldless and precise forming under various bending radii. The formed pipes are used in the internal structure of aero-engine ducts, satellite pipelines, and aircraft missiles. [0003] Because the three-dimensional free bending technology can change the size of the bending radius at any time by changing the size of the eccentricity, compared with the general forming method, it is very convenient to form a pipe member with variable curvature, and because the contact between the bending die and the pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D7/08B21D7/16
Inventor 程诚程宗辉刘释轩舒送郭训忠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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