| With the rapid development of cutting technology,PCBN cutting tools are usually used for cutting difficult-to-machine materials such as hardened steel Cr12 Mo V in equipment manufacturing due to their advantages of high hardness and high wear resistance.However,the PCBN tool material is brittle,and the high mechanical load during cutting will lead to higher cutting force and faster tool wear,for which new technical methods are needed to achieve innovation in tool structure.Biomimicry studies have shown that limpet teeth have excellent strength and sharpness,and can easily cut hard rocks without causing damage to the teeth,and its labor-saving effect is very significant.Therefore,in this paper,the structural characteristics of the inner contour curve of limpet teeth are applied to the rake face of PCBN cutting tools,and a PCBN bionic cutting tool with limpet tooth profile configuration is designed,and the cutting performance of the tool is studied for hardened steel Cr12 Mo V material.Firstly,using limpet teeth as a bionic prototype,the contour features of the teeth were extracted,and polynomial curve fitting was performed on the contours,and then the variable curvature characteristics of the limpet tooth contour curves were analyzed.According to the inner contour structure of limpet teeth,it is parameterized into 6 characteristic parameters,which are used as the rake face structure of the cutting tool.The cutting of hardened steel Cr12 Mo V by PCBN bionic cutting tool was simulated by using Third Wave Advant Edge,and the changing trend of cutting force and cutting temperature was obtained.The labor-saving effect of PCBN bionic cutting tool is proved by comparing with PCBN planar cutting tool.At the same time,the three-dimensional model design of the PCBN bionic cutting tool is completed with the combination of the minimum cutting force parameter combination,and the PCBN bionic cutting tool was prepared by three-dimensional high-precision laser processing according to the material characteristics and structural characteristics of the PCBN bionic cutting tool.Secondly,the experiment of PCBN bionic cutting tool and PCBN planar cutting tool cutting hardened steel Cr12 Mo V was designed,and the cutting force of PCBN bionic cutting tool changed with cutting parameters was analyzed through orthogonal experiments,and the labor-saving effect of PCBN bionic cutting tool was verified.Through the force analysis of the cutting process of the tool,the labor-saving reason of the PCBN bionic cutting tool was studied.At the same time,the effect of cutting parameters on the surface roughness was also explored.Thirdly,the influence of cutting parameters on the macro and micro morphology of the chips of the two cutting tools was studied through single-factor experiments.It was found that compared with the PCBN planar cutting tool,the PCBN bionic cutting tool has a better chip removal effect,and the degree of chip serration,tooth spacing and frequency of chip serration are lower.At the same time,the wear morphology of the two cutting tools is studied,and it is proved that the wear degree of the rake face and the flank face of the PCBN bionic cutting tool is lower than that of the PCBN planar cutting tool.Finally,an orthogonal experiment scheme is established,and the regression models of the three are fitted according to the cutting force,cutting temperature and tool wear data obtained from the simulation.The PCBN bionic cutting tool parameter optimization platform was constructed by Python language,and the parametric modeling of PCBN bionic cutting tool was completed.The single-objective and multi-objective optimization of cutting tool parameters with cutting force,cutting temperature and tool wear as evaluation indexes are realized through genetic algorithm,and the data prediction of cutting force,cutting temperature and cutting tool wear is completed. |
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