In order to alleviate the cutting-tool wear problems in the process of cutting difficult materials such as titanium alloy,the linear groove texture was machined on the surface of YG6 cemented carbide tool by laser under the air medium and liquid auxiliary conditions respectively.The friction and wear properties of textured tools processed by different processes were tested on the UMT linear reciprocating friction and wear tester.The wear morphology was characterized and analyzed by stereomicroscope.The test was simulated by computational fluid dynamics method,and combining with hydrodynamic analysis,the antifriction mechanism of textured cutting tools under lubrication condition was explored.The results show that the laser processing technology significantly affects the friction and wear behavior of the cemented carbide tool surface under the condition of cutting fluid lubrication;the textured surface obtained by liquid as-sisted laser processing shows good friction and wear resistance,and the friction coefficient decreases by 78.2％compared with the non textured tool surface,it is mainly because the oil film in the tool-workpiece contact area produces a good wedge effect during the friction process,which improves the lubrication state during the friction process,the tribological properties are improved.
关键词
表面织构/液体辅助激光加工/摩擦磨损/动压润滑
Key words
surface texture/liquid assisted laser processing/friction and wear/dynamic pressure lubrication
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