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A 3D free bending forming method for martensitic steel

A technology of bending forming and martensitic steel, which is applied in the direction of forming tools, feeding devices, manufacturing tools, etc., can solve the problems of inability to realize free bending, low bending radius precision, and surface coating damage, etc., and achieve small deformation, The effect of high deformation precision, rapid and uniform quenching and forming

Active Publication Date: 2019-09-24
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it still has the following disadvantages: (1) 3D free bending can only realize the cold forming process, and there is no good solution for the difference in size change caused by the hot forming process; (2) In the process of 3D free bending, the tube When the billet is advanced, it will have severe friction with the fixture, which may easily cause damage or even peeling off of the surface coating; (3) 3D free bending technology can only form metals without quenching and cooling process.
[0004] Among the existing patents, only CN201410159236.X (an ultra-high-strength steel pipe and its continuous production method) and CN201010263433.8 (a processing method for high-strength and ultra-high-strength steel pipes) relate to the preparation of ultra-high-strength steel pipes methods, but they all stay in the preparation of straight pipes and do not involve the manufacture of bent parts
In addition, there is no clamping equipment in the ultra-high-strength steel pipe processed in CN201010263433.8, there is no straightening operation, and there is no protective atmosphere, and the ultra-high-strength steel is prone to oxidation and deformation during the quenching operation. Radius accuracy is also lower
In addition, as far as pipe bending technology is concerned, the current pipe bending methods are generally push bending and winding forming, which cannot realize free bending in 3D

Method used

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  • A 3D free bending forming method for martensitic steel
  • A 3D free bending forming method for martensitic steel
  • A 3D free bending forming method for martensitic steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Refer to attached figure 1 , 2 , 3, a martensitic steel 3D free bending forming device and method, comprising the following steps:

[0045] Parameter determination: select 22MnB5 ultra-high-strength steel pipe with a length of 700mm, a diameter of 25mm, and a wall thickness of 1.5mm to optimize the process parameter setting. After the finite element iterative processing is completed, the corresponding correction coefficients k and k' should be within 1% of the error 1.3 and 1.65 respectively;

[0046] The process of determining the correction coefficient is as follows: before quenching, scan the shape of the newly bent pipe with a 3D scanner, then open the nozzle for rapid quenching, and scan the shape of the parts that have rebound effects after quenching. Export the data to the analysis software, establish a numerical model again for comparison, set the initial value of the material correction coefficient iteration to 1, and calculate the corresponding springback co...

Embodiment 2

[0055] Refer to attached figure 1 , 2 , 3, a martensitic steel 3D free bending forming device and method, comprising the following steps:

[0056] Parameter determination: select the 30MnB5 ultra-high strength steel pipe with a length of 600mm, a diameter of 30mm, and a wall thickness of 2mm to optimize the process parameter setting. After the finite element iterative processing is completed, the corresponding correction coefficients k and k' are respectively under the condition that the error is not greater than 1%. 1.2 and 1.98;

[0057] 1) Clamping: put the pipe into the propulsion device 9, use the clamping device 8 to determine its stability in the X direction, Y direction and Z direction, and perform a trial push operation to verify whether the guide wheel is working normally; open the propulsion mechanism, and place the pipe Try pushing it into the induction heating device 6 with a fixed thrust of 1kN to test whether the transport guide wheel 7 has the effect of reduc...

Embodiment 3

[0063] Refer to attached figure 1 , 2 , 3, a martensitic steel 3D free bending forming device and method, comprising the following steps:

[0064] Parameter determination: 30CrMnSiA ultra-high strength steel pipe with a length of 650mm, a diameter of 20mm, and a wall thickness of 1.3mm with pure zinc coating is selected for process parameter setting optimization. After the finite element iterative processing is completed, the corresponding correction coefficient is when the error is not greater than 1%. k and k' are 1.16 and 1.34 respectively;

[0065] 1) Clamping: put the pipe into the propulsion device 9, use the clamping device 8 to determine its stability in the X, Y and Z directions, and perform a test push operation to verify whether the guide wheel is working normally; open the propulsion mechanism, and place the pipe Try pushing it into the induction heating device 6 with a fixed thrust of 1kN, and test whether the transport guide wheel 7 has the effect of reducing t...

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Abstract

The invention discloses a martensite steel 3D free-bending forming device and method and belongs to the technical field of advanced manufacturing and plastic forming. Firstly, based on relative parameters of the forming performance of a pipe material, a corresponding correction factor of the material is obtained through repeated iterative calculation, and an initial model is corrected; after the using situations of parts are tested and calibrated, a three-stage type induction heating device and sensors are matched to achieve precise temperature-control heating; the three-dimensional space of abending mould rotates to extrude the front end of the pipe material to enable the front end of the pipe material to be in a bent shape with the complicated space; and the quenching process is conducted through an annular water-cooling spraying head and accordingly is rapid and uniform. The martensite steel 3D free-bending forming technical problem is solved, and high-temperature free-bending forming under the three-dimensional space is achieved; by means of a rapid quenching system, the strength of 1400 MPa or above is obtained, formation coordinated control of an ultrahigh-strength steel 3Dfree-bending member is achieved; and thus the martensite steel 3D free-bending forming device and method have important engineering application value in the fields of aerospace, rail transportation, automobiles and nuclear power.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing of metal complex structural parts, in particular to 3D free bending forming of complex martensitic steel pipe parts. Background technique [0002] In the aerospace, rail transit, and automobile industries, lightweight materials are used in the manufacture of various key parts due to the requirement for speed increase. Martensitic steel has extremely high tensile strength. For the manufacture of the same part, it can reduce the use of a large amount of materials while ensuring the corresponding tensile strength; and it is cheaper than carbon fiber, so it is widely used in aerospace In the manufacture of key structures of relevant equipment in aviation, rail transit and other industries; in the current production process of ultra-high strength steel, only the hot stamping process can fully realize the rapid and accurate forming of martensitic steel, which is heated to austenitic The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D7/08B21D7/12B21D7/16B21D43/02B21D37/18C21D1/18C21D7/06B24C1/08
Inventor 李华冠郭训忠王章忠费炜杰巴志新张保森
Owner NANJING INST OF TECH
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