| It is one of the important directions of modern cutting tool research that micro-texture is inserted into the tool and filled with solid lubricant into micro texture,which improves tool cutting performance by double coupling action.However,a variety of complex processing steps have inhibited its further development.A series of links,such as tool preparation,micro texture processing and solid lubricant filling,have become an important factor in the preparation of this dual coupling tool.Therefore,it is necessary to integrate many links into one,and one step forming double coupling micro texture self lubricating cutting tools.In this study,the cutting experiments of 45 steel and 40Cr were carried out by using this tool.The cutting performance was analyzed and compared.The mechanism of wear reduction and wear resistance of in-situ formed micro texture self lubricating ceramic tool was discussed.The specific research contents are as follows:(1)According to the cutting characteristics of traditional non-texturing tools,different micro-textures are designed in the blade-chip contact area of the rake face,which specifically includes different groove directions,different micro-texture positions,different groove widths,and different groove pitches.And derive the shape features of the punch.(2)Using the finite element cutting simulation software,the designed non-texturing tool,transverse and longitudinal micro-texturing tools were tested on the 45 steel under the same cutting conditions.Through comparative analysis of cutting force,cutting temperature and rake face stress analysis,the study shows that compared with the non-texturing tool,the effective size of micro-texture placed in the tool rake face can improve the cutting performance of the tool.,especially the morphological parameters are:lateral micro-texturing tools with a distance of 0.2 mm from the cutting edge,a groove width and a pitch of 0.1 mm.While reducing cutting force and cutting temperature,it will also disperse tool nose stress and promote chip bending.(3)Preparation of micro-texture punches by micro-milling and analysis of their three-dimensional morphology.It is found that the influence of the width of the protrusion on the integrity of the punch is small,and the punches maintain good integrity with increasing width;The bump spacing has a large influence,and the punch mold integrity deteriorates as the spacing increases.Then the micro-textured self-lubricating ceramic tool with different morphology was prepared by in-situ forming method.(4)The micro-textured self-lubricating ceramic tool with different topography prepared by in-situ forming method was used for 45#steel and 40Cr cutting test.And compared with the traditional non-texturing tools,the cutting force,cutting temperature,friction factor,shear angle,rake face wear and chip morphology are analyzed.The results show that the cutting performance of the transverse textured cutter is better than that of the non-texturing cutter.In addition,by comparing the cutting performance of micro-texturing tools with different position distributions,different groove widths and pitches,the best profile parameters were obtained:micro-weave cutting edge 0.2 mm,groove width 0.1 mm,groove pitch 0.1mm.The test results echo the simulation results,verifying the reliability of the cutting simulation.(5)By analyzing the wear reduction mechanism of the in-situ formed micro-textured self-lubricating ceramic tool,the reason why the micro-texturing tool improves the cutting performance during the cutting process is as follows:a.Under the action of the liquid debris,the abrasive particles penetrate into the micro-texture,so that the graphite solid lubricant in the texture overflows and is coated on the rake face to form a lubricating film,which reduces the shear strength of the knife-chip contact surface;b.The presence of the micro-texture reduces the blade-chip contact area,thereby reducing the knife-chip friction. |
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