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Current auxiliary forming method of metal plate hollow structural member

A technology for metal sheets and structural parts, applied in the field of current-assisted process for multi-layer hollow structural parts, can solve the problems of limiting structural lightweight limit design, poor mechanical properties, etc. Effect

Inactive Publication Date: 2019-11-12
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large structural difference between the connection area and the base metal, the poor mechanical properties of the joint interface of the commonly used fusion welding process or the brazing process with the addition of an intermediate transition layer limit the design of the structural lightweight limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Current assisted thermal bending of the core board

[0023] Ti 2 The AlNb alloy plate is energized and heated, and the temperature is raised to 980°C within 1 minute. The specific heating method is: the temperature of the plate is raised to 100°C in the first 20s, and the temperature is linearly increased to 980°C in the next 20-40s. -60s at 920°C for 1min, the current density is 10.4A / mm 2 ; For high temperature plate Ti 2 AlNb alloy is bent at a pressing speed of 1mm / min. When the bending mold pressure reaches 10MPa, after holding the pressure for 5 minutes, power off and cool down to obtain the required high-precision core plate;

[0024] 2) Current-assisted diffusion connection

[0025] Ti 2 The AlNb alloy core plate and the upper and lower panels are subjected to rough grinding, polishing, pickling, ultrasonic cleaning and drying in sequence; then the core plate and the upper and lower panels are placed in the heating equipment to form a three-layer hollow s...

Embodiment 2

[0027] 1) Current assisted thermal bending of the core board

[0028] Ti 2 The AlNb alloy plate is energized and heated, and the temperature is raised to 980°C within 1 minute. The specific heating method is: the temperature of the plate is raised to 100°C in the first 20s, and the temperature is linearly increased to 980°C in the next 20-40s. -60s at 920°C for 1min, the current density is 10A / mm 2 ; For high temperature plate Ti 2 AlNb alloy is bent at a pressing speed of 1mm / min. When the bending mold pressure reaches 9MPa, after holding the pressure for 3 minutes, power off and cool down to obtain the required high-precision core plate;

[0029] 2) Current-assisted diffusion connection

[0030] Ti 2 The AlNb alloy core plate and the upper and lower panels are subjected to rough grinding, polishing, pickling, ultrasonic cleaning and drying in sequence; then the core plate and the upper and lower panels are placed in the heating equipment to form a three-layer hollow stru...

Embodiment 3

[0032] 1) Current assisted thermal bending of the core board

[0033] Ti 2 The AlNb alloy plate is energized and heated, and the temperature is raised to 980°C within 1 minute. The specific heating method is: the temperature of the plate is raised to 100°C in the first 20s, and the temperature is linearly increased to 980°C in the next 20-40s. -60s at 920°C for 1min, the current density is 11A / mm 2 ; For high temperature plate Ti 2 AlNb alloy is bent at a pressing speed of 1mm / min. When the bending mold pressure reaches 11MPa, after holding the pressure for 10 minutes, power off and cool down to obtain the required high-precision core plate;

[0034] 2) Current-assisted diffusion connection

[0035] Ti 2 The AlNb alloy core plate and the upper and lower panels are subjected to rough grinding, polishing, pickling, ultrasonic cleaning and drying in sequence; then the core plate and the upper and lower panels are placed in the heating equipment to form a three-layer hollow st...

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Abstract

The invention belongs to the field of multi-layer hollow structural member current auxiliary technology, and particularly relates to a current auxiliary forming method of a metal plate hollow structural member. According to the current auxiliary forming method of the metal plate hollow structural member, the method comprises the steps that current auxiliary thermal bending is carried out on a coreplate, namely a metal plate is applied with currents to be heated and is applied with pressure to be bent, and after power-off and cooling, the core plate is obtained; and current auxiliary diffusionconnection is carried out and specifically comprises the following steps that the surfaces of the core plate, an upper plate and a lower plate are cleaned, the core plate, the upper plate and the lower plate are assembled, a support cushion block is placed in the hollow position, pre-pressing is carried out, the current is applied to heat the diffusion connection, cooling is carried out, and thenthe metal plate hollow structural member is obtained. By adopting the current auxiliary technology, multi-layer structures of metal material can be efficiently and quickly connected, and meanwhile, the requirements of high connection strength and high use performance can be met.

Description

technical field [0001] The invention belongs to the field of current-assisted technology of multilayer hollow structural parts, and in particular relates to a method for current-assisted forming of hollow structural parts of metal plates. Background technique [0002] At present, the lightweight design of the fuselage is an effective way to improve the thrust-to-weight ratio. For flight structural components, not only the design of lightweight materials can be carried out, but also the lightweight of structural design can be pursued. In terms of structural lightweight design, connection technology is widely used in the overall design of structures. However, due to the large structural difference between the connection area and the base metal, the poor mechanical properties of the connection interface of the commonly used fusion welding process or the brazing process with the addition of an intermediate transition layer limit the design of the structural lightweight limit. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21D37/16B21D5/06
CPCB21D5/06B21D37/16B23P15/00
Inventor 杨建雷张文丛陈文振崔国荣王国峰
Owner HARBIN INST OF TECH AT WEIHAI
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