The Study Of Cutting Performance And Tool Wear Of CBN Cutting Tools In Dry Cutting Conditions

As a new material processing method, dry cutting has been used in many industrial departments. Dry cutting is a single point turning way. One advantage of dry cutting is that it can reduce processing procedures and in some conditions replace grinding process.In addition, dry cutting has high efficiency and can reduce damage to the environment.However, some adverse factors restrict the application of dry cutting, such as inappropriate selection of cutting tools or unreasonable selection of process parameters,which can lead to a sharp rise of cutting temperature and cutting force, thus reducing the tool life and affecting the machining quality of the product.Turning experiments of cold work mould steel Cr12 Mo V and high temperature alloy GH169 using cubic boron nitride(CBN) cutting tools were carried out in a CNC lathe.Orthogonal experiment scheme was made with cutting speed, feed rate, and cutting depth as variables, surface roughness of machined parts was measured, and tool wear was also analyzed. Prediction models of surface roughness based on the three cutting parameters were established through response surface method, and the average prediction error is less than 10%. Application of BP artificial neural network can realize high precision of prediction by using a small amount of test samples. Prediction accuracy is higher compared with that of response surface method, and the error is less than 5%.To study the effect of the three cutting parameters on each index, DEFORM-3D software was applied to realize finite element simulation of dry turning Cr12 Mo V and GH169 according to orthogonal experiment scheme. Cutting force and cutting temperature were chosen to be the indexes, and the significant degree of the effect of the three cutting parameters on each index was achieved. Empirical formulas of cutting force in hard dry turning of Cr12 Mo V and GH169 using CBN cutting tools were obtained. The best cutting parameter combination was determined under comprehensive consideration of surface roughness, cutting force, and cutting temperature by using matrix analysis method.The research will provide technical support for dry turning of Cr12 Mo V and GH169 using CBN tools, and will guide the choice of the three cutting regimes to control cutting force and cutting temperature to reduce tool wear and to obtain the ideal surface roughness, thereby lowering the production cost and improving the product quality.