Laser-quenching liquid-nitrogen cooling method of large gear ring tooth surface
A laser quenching and liquid nitrogen cooling technology, applied in the direction of quenching agent, furnace type, furnace, etc., can solve the problem of difficult thermal deformation, achieve small surface deformation, solve the problem of deformation and accuracy can not be guaranteed, and improve the service life.
Inactive Publication Date: 2014-02-12
CHANGZHOU UNIV
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Problems solved by technology
In the prior art, high-frequency quenching is often used on the surface of super-large ring gears, and the thermal deformation after quenching is difficult to control
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[0017] A preferred embodiment of the present invention will be further described below in conjunction with the accompanying drawings.
[0018] The super large ring gear material is 40CrNiMo steel, its chemical composition (mass fraction, %): C 0.37-0.44, Si 0.20-0.40, Mn 0.50-0.80, Cr 0.60-0.90, Mo 0.15-0.25, Ni 1.25-1.75, the rest For Fe element. After rough turning, quenching and tempering treatment, gear hobbing, gear grinding, and polishing, the super-large ring gear is quenched with He-Ne laser. The laser process parameters are: power 1.5kW, scanning speed 6.5mm / s, spot Size Φ4mm.
[0019] Such as figure 1 As shown, the laser quenching and liquid nitrogen cooling device includes a laser generating device 1 , and the laser generating device 1 includes a He-Ne laser 2 , a light valve 3 , a cylinder 4 , and an absorption pool 5 . The laser beam 6 generated by the laser generating device is irradiated on the reflector 7, and the reflector 7 changes the direction of the...
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Abstract
The invention discloses a laser-quenching liquid-nitrogen cooling method of a large gear ring tooth surface. The laser-quenching liquid-nitrogen cooling method comprises the following steps of: by utilizing He-Ne laser as a heat source, and precisely controlling a quenching temperature by controlling laser scanning speed; generating martensite phase transformation on the surface as the large gear ring surface absorbs energy of the laser; transforming all of residual austenite on the surface into martensite by liquid-nitrogen cooling. By adopting a technical scheme of the invention, quenching treatment is carried out onto the large gear ring surface by using He-Ne laser, then, the large gear ring surface is cooled by using liquid nitrogen, so that a laser thermal deformation change is reduced, precision of the large gear ring surface is improved; and meanwhile, complete martensite can be obtained on the large gear ring surface under chilling of the liquid nitrogen, so that a problem that deformation and precision of the large gear ring by normal thermal treatment cannot be ensured is solved. Besides, service life of the large gear ring tooth surface is prolonged, and engineering application value is very important.
Description
technical field [0001] The invention relates to the technical field of material surface modification treatment, in particular to the use of laser thermal effect to quench the surface of a super-large ring gear with a diameter of 5-10m, and the use of liquid nitrogen to perform ultra-low temperature cooling, so that the surface structure after laser quenching is completely transformed into Marshmallow body, improve the surface microhardness, and improve the wear resistance of super large ring gears. Background technique [0002] The super-large ring gear is mainly used to transmit the rotary motion of the large CNC machine tool table, and the accuracy is generally controlled at 0.001 mm, so that the rotary accuracy and indexing accuracy of the table can be controlled within 0.002 mm. In the prior art, high-frequency quenching is often used on the surface of super-large ring gears, and it is difficult to control thermal deformation after quenching. Contents of the invention...
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IPC IPC(8): C21D1/09C21D1/613C21D9/32
CPCY02P10/20
Inventor 孔德军付贵忠王文昌蔡金龙张垒叶存冬吴永忠龙丹
Owner CHANGZHOU UNIV