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Laser quenching process for reducing width of laser quenching lap joint soft belt

A technology of laser quenching and soft belt, which is applied in the field of laser heat treatment, can solve the problems of uneven quenching hardening layer, etc., and achieve the effect of increasing the depth of quenching layer, increasing the entrance light spot, and shortening the collimation length

Pending Publication Date: 2021-09-07
DANYANG HONGTU LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of multi-pass laser scanning, there will be a certain degree of overlap between two adjacent hardened zones, and part of the former laser hardened zone will be reheated by the adjacent subsequent laser, and the formed Martensite The body structure is transformed into tempered martensite with lower hardness after being reheated. Therefore, there will be tempered soft bands in the workpiece after multi-pass scanning quenching, resulting in uneven quenching hardening layer.

Method used

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  • Laser quenching process for reducing width of laser quenching lap joint soft belt
  • Laser quenching process for reducing width of laser quenching lap joint soft belt
  • Laser quenching process for reducing width of laser quenching lap joint soft belt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A laser quenching process for reducing the width of laser quenched lapped soft bands, comprising the steps of:

[0027] A. Clean the surface of the roll to be quenched to ensure that its surface meets the requirements of laser quenching;

[0028] B. Select the laser line laser with multi-mode 1020um wavelength and 1000um fiber core diameter as the laser equipment, and adjust it, adjust the collimation degree from 100mm to 75mm, adjust the integrating mirror to 30*5mm, and adjust the process parameters. The moving speed is 180mm / min, the power is 3.5kw, and the emission direction of the laser beam is adjusted so that the energy of the spot is shifted to the overlapping overlapping end by 10°, and the overlapping rate is set to 10%, so as to realize the concentration of energy at the right end and reduce the virtual spot .

[0029] C. Use the adjusted laserline laser to perform multi-channel laser scanning quenching on the surface of the roll to be quenched;

[0030] D....

Embodiment 2

[0033] A laser quenching process for reducing the width of laser quenched lapped soft bands, comprising the steps of:

[0034] A. Clean the surface of the roll to be quenched to ensure that its surface meets the requirements of laser quenching;

[0035] B. Select the laser line laser with multi-mode 1020um wavelength and 1000um fiber core diameter as the laser equipment, and adjust it, adjust the collimation degree from 100mm to 75mm, adjust the integrating mirror to 30*5mm, and adjust the process parameters. The moving speed is 170mm / min, the power is 3.4kw, adjust the emission direction of the laser beam, so that the energy of the spot is shifted to the overlapping overlapping end by 8°, and the overlapping rate is set to 12%, so as to realize the concentration of energy at the right end and reduce the virtual spot .

[0036] C. Use the adjusted laserline laser to perform multi-channel laser scanning quenching on the surface of the roll to be quenched;

[0037] D. Measure ...

Embodiment 3

[0039] A laser quenching process for reducing the width of laser quenched lapped soft bands, comprising the steps of:

[0040] A. Clean the surface of the roll to be quenched to ensure that its surface meets the requirements of laser quenching;

[0041] B. Select the laser line laser with multi-mode 1020um wavelength and 1000um fiber core diameter as the laser equipment, and adjust it, adjust the collimation degree from 100mm to 75mm, adjust the integrating mirror to 30*5mm, and adjust the process parameters. The moving speed is 160mm / min, the power is 3.3kw, adjust the emission direction of the laser beam, so that the energy of the spot is offset by 10° to the overlapping overlapping end, and the overlapping rate is set to 10%, so as to realize the concentration of energy at the right end and reduce the virtual spot .

[0042] C. Use the adjusted laserline laser to perform multi-channel laser scanning quenching on the surface of the roll to be quenched;

[0043] D. Measure ...

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Abstract

The invention relates to a laser quenching process for reducing the width of a laser quenching lap joint soft belt. The incident light spot can be effectively increased by shortening the collimation length, the heating time of a light spot region can be effectively increased within the same time by increasing the area of an integral mirror, and the heating time of a light spot in a heating region can be effectively prolonged by reducing the moving speed, the heating depth is enhanced, the depth of a quenching layer is effectively improved, light spot energy is made to deviate towards the lap joint overlapping end by adjusting the emitting direction of a laser beam, energy concentration at the right end can be effectively achieved, and virtual spots are reduced. Through adjustment of technological parameters, the width of the tempered soft belt of the obtained laser quenching hardened layer can be reduced to 0.2-0.3 mm from 0.5-1.0 mm in the original technology, the hardness of the soft belt is not obviously reduced, and the ideal effect is achieved.

Description

technical field [0001] The invention relates to the technical field of laser heat treatment, in particular to a laser quenching process for reducing the width of a laser quenched lapped soft belt. Background technique [0002] With the development of industrial lasers, laser quenching technology has been more and more widely used. Laser surface quenching is to quickly scan the surface of the workpiece with a high-energy laser beam, and quickly absorb energy in a small area (spot size) with a very thin layer on the surface to make the temperature increase rapidly. Due to the excellent heat transfer and thermal conductivity of the metal matrix, the surface heat is quickly transferred to other parts of the workpiece, so that the self-cooling and quenching can be completed in a very short moment, and the phase transformation hardening of the workpiece surface can be realized. After laser quenching, martensite and ledeburite with refined crystals and compact structure can be obt...

Claims

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Application Information

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IPC IPC(8): C21D1/09
CPCC21D1/09
Inventor 何建方刘少彬马万花刘汉杰高龙信成飞
Owner DANYANG HONGTU LASER TECH
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