Effect Of Femtosecond Laser Machining YW2 Carbide Surface Microtexture On Its Wettability

The rapid wear of cemented carbide tools limits the processing cost and quality of high-speed cutting.The surface micro-texture can adjust the surface wettability of cemented carbide tools,improve the lubrication effect,and increase the tool life.In this paper,the two core issues of the influence of laser processing technology parameters on the micro-texture of the carbide YW2 tool surface and the effect of the surface micro-texture morphology parameters on the wetting properties of the carbide tool are researched.The specific research contents and conclusions are as follows:(1)Using different laser parameters to process the surface of cemented carbide YW2,study the influence of laser processing parameters on the surface microtexture,select the height parameter in the ISO25178 system to establish the quantitative relationship between the three-dimensional roughness and the microtexture surface morphology According to the test results,optimize the parameters and process the desired surface microtexture.The results show that with the increase of the average power and the number of scans,the actual side length of the square micro-pit texture is slightly increased and tends to be stable,and the depth is significantly increased.The trend is slowed down;the three-dimensional roughness parameters are affected by the average power and scan The number of times has obvious influence;as the scanning speed of laser processing increases,the width and depth of the micro-groove texture continue to decrease.When the scanning speed is greater than the ratio of the spot diameter to the single pulse width,the micro-groove groove is discontinuous.When the average power is within 2W,and within 35 consecutive scans,the surface quality of the pit is good,without sharp protrusions;when the scanning speed is between 50mm/s and 150mm/s,the groove is continuous and the bottom is flat.(2)Using femtosecond laser to process square micro-pit texture on the surface of cemented carbide YW2,the influence of laser parameters,surface topography parameters and three-dimensional roughness parameters on the surface contact angle was studied,based on the wenzel wetting model calculation theory The contact angle is used to analyze the wetting mechanism of the surface texture of square micro-pits.The test results show that for the square micro-pit texture,the actual contact angle and the calculated contact angle are basically the same under different side lengths and spacings,which is consistent with the wenzel wetting model;when the side length is 300?m,the control distribution density is 13% ~ 44% A hydrophilic micro-textured surface can be obtained in between.(3)Using the femtosecond laser to process the micro-groove texture on the surface of cemented carbide YW2,the effect of the width and spacing of the micro-groove texture on the surface contact angle was studied.The test results show that when the center distance of the micro-grooves is fixed,the width and spacing of the micro-grooves have no obvious effect on the surface contact angle;the average laser power is 2W,the number of scans is 35,the depth of the micro-grooves is 50?m,and the width of the micro-grooves It is 250?m,the micro groove spacing is 50?m,a hydrophilic surface is obtained and the processing time is moderate.