Method for reducing residual stress of ferromagnetic metal material

A technology of ferromagnetic materials and metal materials, applied in the field of material processing, can solve the problems of reducing residual stress and not very significant processing effect.

Active Publication Date: 2010-05-26
苏州强基电磁强化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent also uses mechanical vibration to reduce residual stress, and the treatment effect is not very significant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The processing method of the present embodiment comprises the following steps:

[0025] 1. The 16Mn steel plate with a thickness of 12mm connected by ferromagnetic material, namely submerged arc welding, is directly connected to the pulse power supply through wires;

[0026] 2. Insert the iron core into the multi-turn excitation coil, the number of turns of the multi-turn excitation coil is 100 turns, and connect the excitation power supply to the multi-turn excitation coil;

[0027] 3. Place the ferromagnetic material in the magnetic pole formed by the multi-turn excitation coil and the iron core, start the pulse power supply and the excitation power supply at the same time, and the pulse current density is 10 2 A / cm 2 , the action time of a single electric pulse is 0.1ms, and the number of continuous input current pulses is 5. After continuously inputting 5 pulse currents with an action time of 0.1ms, there must be an interval of 3s, and input 5 pulse currents with a...

Embodiment 2

[0030] The processing method of the present embodiment comprises the following steps:

[0031] 1. The 8mm thick 15MnVN steel plate connected by CO2 gas shielded welding is directly connected to the pulse power supply through wires;

[0032] 2. Insert the iron core into the multi-turn excitation coil, the number of turns of the multi-turn excitation coil is 200 turns, and connect the excitation power supply to the multi-turn excitation coil;

[0033] 3. Place the ferromagnetic material in the magnetic pole formed by the multi-turn excitation coil and the iron core, start the pulse power supply and the excitation power supply at the same time, and the pulse current density is 3*10 2 / cm 2 , the action time of a single electric pulse is 1ms, and the number of continuous input current pulses is 10. After continuously inputting 10 pulse currents with an action time of 1ms, there must be an interval of 4s, and input 10 pulse currents with an action time of 1ms again. The interval b...

Embodiment 3

[0036] The processing method of the present embodiment comprises the following steps:

[0037] 1. The U71Mn rail connected by the ferromagnetic material, that is, flash butt welding, is directly connected to the pulse power supply through wires;

[0038] 2. Insert the iron core into the multi-turn excitation coil, the number of turns of the multi-turn excitation coil is 300 turns, and connect the excitation power supply to the multi-turn excitation coil;

[0039] 3. Place the ferromagnetic material in the magnetic pole formed by the multi-turn excitation coil and the iron core, start the pulse power supply and the excitation power supply at the same time, and the pulse current density is 5*10 2 A / cm 2 , the action time of a single electric pulse is 5ms, and the number of continuous input current pulses is 20. After continuously inputting 20 pulse currents with an action time of 5ms, there must be an interval of 5s, and input 20 pulse currents with an action time of 5ms again....

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Abstract

The invention relates to a method for reducing the residual stress of a ferromagnetic metal material. The method is to process the ferromagnetic metal material through a pulse current and a pulse magnetic field, wherein the processing time is 10 to 50 s; the density of the pulse current is 102 to 104 A / cm2; the action time of a single pulse is 0.1 to 50 ms; the number of the continuously input current pulses is 5 to 30; an interval between a process of continuously inputting 5 to 30 pulse current with the action time of 0.1 to 50 ms and a process of inputting 5 to 30 pulse current again with the action time of 0.1 to 50 ms is 3 to 5 s; the number of interval times of the whole processing procedure is 4 to 6; the pulse magnetic field is generated in an electromagnet mode; the exciting peak value current is 30 to 80 amperes; the output field strength is 0 to 2.25 T; the action time of a single magnetic pulse is 0.2 to 1 s and the interval is 0.2 to 1 s; and the magnetic pulse and the interval are performed alternatively until the whole processing procedure ends up. The method can obviously reduce the residual stress.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a method for reducing residual stress of ferromagnetic metal materials. Background technique [0002] How to reduce the residual stress of metal materials has always been an important research direction in the field of materials engineering. Among the treatment methods currently used, heat treatment can effectively reduce the residual stress of ferromagnetic materials and has been widely used. However, the heat treatment process will cause significant residual deformation, and it is easy to cause stress release cracks and temper brittleness for steel with high alloy content; in addition, heat treatment has high energy consumption, low efficiency, and surface oxidation, so that heat treatment cannot be used as the final process. scope of use. [0003] The application number is: 200720191297, the name is: the system for eliminating the internal residual stress of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00
CPCY02P10/20
Inventor 蔡志鹏
Owner 苏州强基电磁强化科技有限公司
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