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Technology method for pulse laser etching cobalt melting and fusing enhancing hard alloy

A cemented carbide and pulsed laser technology, applied in the field of laser processing, can solve the problems of not being able to greatly improve the service life of cemented carbide and low bonding strength.

Inactive Publication Date: 2010-02-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the above coating is relatively thin, generally no more than 10um, and the bonding strength between the coating and the cemented carbide substrate is low, it cannot greatly improve the service life of the cemented carbide

Method used

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  • Technology method for pulse laser etching cobalt melting and fusing enhancing hard alloy
  • Technology method for pulse laser etching cobalt melting and fusing enhancing hard alloy
  • Technology method for pulse laser etching cobalt melting and fusing enhancing hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) The grade of the cemented carbide to be processed is S4X7, which is a tungsten-cobalt-titanium cemented carbide. The typical application of this cemented carbide is a turning tool and a saw blade for cutting metal. The size of the material is length × width × height: 10 × 7×4mm, the surface is cleaned with alcohol before laser irradiation to remove the sundries and oil stains on the surface;

[0012] (2) The pulsed laser adopts a 248nm excimer laser with a pulse width of 25ns. The optical path of the laser beam is adjusted, and the laser beam is perpendicular to the workpiece, that is, the incident angle is 0°;

[0013] (3) The size of the laser beam obtained by shaping and homogenizing technology is 7×5 mm, and the laser beam of this size is used for laser irradiation in the tool tip area, and the power density of the laser is 9.9×10 7 W / cm 2 , the number of laser treatment pulses is 500, the laser pulse frequency is 20Hz, and a laser melting zone of 7×5mm is obta...

Embodiment 2

[0017] (1) The grade of the cemented carbide to be processed is Kcr06, which is a tungsten-cobalt cemented carbide. The typical use of this cemented carbide is turning tools or saw blades. The size of the material is 10.5×3.4×3.0mm. Clean the surface with alcohol before to remove the sundries and oil stains on the surface;

[0018] (2) The pulsed laser adopts a 1060nm YAG solid-state laser with a pulse width of 90ns, adjusts the optical path of the laser beam, and the incident angle of the laser beam relative to the workpiece is 45°;

[0019] (3) The laser beam is used to scan the area of ​​3.4×4.0mm at the tip of the tool, and the power density of the laser is 1.0×10 6 W / cm 2 , the number of pulses for laser processing is 10, and the laser pulse frequency is 10Hz;

[0020] (4) Carry out quality inspection on the product after laser treatment, carry out EDS energy spectrum analysis to the cobalt content of cemented carbide before and after laser melting, the mass percentage ...

Embodiment 3

[0023] (1) The grade of the cemented carbide to be processed is Jcs03D, which is a cobalt-chromium-nickel-tungsten cemented carbide. The typical use of the cemented carbide is turning tools and saw blades. The typical size of the material is 10.5×3.4 in length×width×height ×3.0mm, the surface is cleaned with alcohol before laser irradiation to remove the sundries and oil stains on the surface;

[0024] (2) The pulse laser adopts a picosecond laser with a wavelength of 532nm and a pulse width of 15ps. The optical path of the laser beam is adjusted, and the incident angle of the laser beam relative to the workpiece is 20°;

[0025] (3) The laser beam is used to scan the area of ​​3.4×4.0mm at the tip of the knife, and the power density is 2.5×10 7 W / cm 2 , the number of laser treatment pulses is 300, the laser pulse frequency is 1KHz, and a laser melting zone of 3.4×4.0mm is obtained on the blade surface;

[0026] (4) Carry out quality inspection of the products after laser tr...

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Abstract

A technology method for pulse laser etching cobalt melting and fusing enhancing hard alloy relates to the laser surface processing technique of a hard alloy cutter and belongs to the technical field of the laser processing. The surface enhanced technology which is based on guaranteeing the toughness of the hard alloy appears in the practical production; generally coating is less than 10mu m; the bonding strength between the coating and the matrix of the hard alloy is lower; therefore, the service life of the hard alloy can not be substantially increased. The technology method carries out laseretching cobalt melting and fusing treatment on the external surface of the hard alloy (the mass percent of the cobalt is 10-30%); the wave length of the pulse laser is 248nm-1060nm; the power densityranges from 1.0*10<6>-9.9*10<7>W / cm<2>; the pulse width is 10 picosecond (ps)-90 nanosecond (ns); the numbers of the pulse is 10-500; and the pulse frequency is 1-20Hz. The thickness of the laser melting and fusing layer is 20-60mu m; the cobalt content in the melting and fusing layer is 3-9%; binder of Co, Ni, Cr and the like and matrix materials are of fast freezing tissues; and the hard alloycan be a cutter or a saw bit and used for processing materials such as metal, wood, etc.

Description

technical field [0001] The invention relates to the laser surface treatment technology of cemented carbide cutting tools, belonging to the technical field of laser processing. Background technique [0002] Tungsten carbide metal superhard materials are widely used in mechanical processing, coal mining, mining, wood processing, steel, metallurgy and other industries. Cemented carbide is generally made of WC, TiC, TaC, NbC, etc. as the base material, and cobalt or nickel as the bonding material. It has high hardness, high strength, wear resistance, good fatigue strength and high temperature oxidation resistance. corrosion performance. Tungsten carbide cemented carbide has good thermal conductivity, high temperature hardness, thermal fatigue resistance, wear resistance, etc., and its price is relatively low. Therefore, cemented carbide based on tungsten carbide has been widely used. Most of the cemented carbide materials produced at home and abroad are WC-Co / WC-Co-Ni-Cr cemen...

Claims

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Application Information

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IPC IPC(8): C21D1/09
Inventor 杨胶溪丁啸雷丽刘华东
Owner BEIJING UNIV OF TECH
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