Optimization Design Of Surface Micro-textures On Carbide Cutting Tools And Its Correlative Mechanisms

The micro-textured surface refers to manufacturing a rough surface with a designed microscopic shape or pattern on the surface of a smooth workpiece through a specific processing method.In recent years,the introduction of functional microtextures on the surface of the tool has revealed that the placement of the micro-textures enables the cutting fluid to effectively penetrate into the cutting zone and form a stable boundary.The lubricating layer provides cooling-lubrication effect,reduces cutting temperature,and reduces adhesive-dissolving-diffusion wear,thereby improving tool life to some extent.In this paper,micro-textured arrays with different parameters of widths,depths,spaces,cutting edge distances,cross-sectional shapes and micro-texture paths are analyzed by combining the finite element simulation analysis with the friction and wear test analysis method to comprehensively study the micro-textures.The influence of the permeability of the cutting fluid on the textured surface and the impact on the surface strength tool is optimized for the micro-texture parameters,so as to obtain a form with a higher cutting fluid permeability and a higher strength.The main research contents of this article are as follows:1.The fluid dynamics analysis theory of micro-textures on the surface of cemented carbide cutting tools was proposed.It was found that the penetration initial velocity of the cutting fluid decreases with the increase of the hydraulic radius of the micro-textures.Using finite element software COMSOL to simulate the micro-texture of the cutting fluid infiltrating into the surface of cemented carbide cutting tools,it was found that the micro-textures of V-section with the large hydraulic radius has the best permeability.2.The finite element simulation analysis of the tool surface strength is performed.Compared with the non-texturing tool,the maximum principal stress of the microtextured tool is larger.The placement of the micro-textures will affect the tool surface strength to a certain extent.However,the overall limit of tool material strength is not exceeded.3.The micro-texture was prepared on the surface of carbide cutting tools by pulsed laser machining,and the micro-texture size under different laser parameters was studied to lay the foundation for the preparation of samples used in the subsequent tests.4.The surface micro-textures cutting fluid penetration test was conducted.The test results show that the penetration of cutting fluid into the micro-texture process increases with the increase of the hydraulic radius,which is consistent with the finite element simulation analysis of the cutting fluid penetration.5.The micro-texture friction wear test was conducted.The experimental results show that the placement of micro-textures changes the wear condition of the tool surface,and the peeling of the tool material occurs under the load of the micro-texture at the corners,but compared to the non-woven.In the case of knives,the placement of the micro-texture slows down the wear of the tool surface and can extend the life of the tool.In this paper,relevant researches on the surface micro-textures of carbide cutting tools have important guiding significance for the design and preparation of the microtextures and the improvement of the permeability of the cutting fluid,thereby prolonging the tool life and improving the cutting performance.