Influence Of Geometry And Process Parameters On Cutting Performance Of U Drilling

U drilling,as a new type of drilling tool with indexable blade,has higher production efficiency and economic benefit compared with existing drilling tools.However,there are still some problems to be solved in the U drilling,such as the imbalance of the radial cutting force of the inner and outer blades during the drilling process,which leads to the low quality of the hole processing,the low service life of the blades,and the large wear and so on.Therefore,this thesis optimizes the installation parameters of internal and external blades of U drilling from the Angle of balance radial force of U drilling and provides a method reference for the design of U drilling.The main contents of this thesis are:(1)First analyze the U drilling bit special structure,through the analysis of metal materials in the process of cutting deformation,deformation mechanism,and then analysis the different cutting period of material removal process,will U drilling inside and outside the blade cutting section is divided into different material removal of deformation zone,to build the corresponding material shear model and cutting force calculation method is established.(2)The drilling process of U drilling is not the traditional right-angle cutting mode,but the bevel cutting mode with axial feed.Therefore,using the mathematical idea of discrete micro segments,the inner and outer cutting edges are separated into numerous micro cutting edges,and each micro cutting edge is approximately regarded as a right Angle cutting process.By calculating the right Angle cutting force on each micro-element cutting edge in axial motion,and then calculating the bevel cutting force of the whole cutting edge by integral.(3)The different cutting force models of internal and external blades of U drilling were transformed into geometric models,and combined with the cutting force model,the optimization model of radial cutting force of internal and external blades of U drilling was established by mathematical analysis software Matlab.(4)In order to verify the accuracy of theoretical drilling simulation results,and to extend it,the changes of radial force,machining stability,surface precision and surface quality of machining holes in different process parameters such as high cutting speed and high feed were further studied.At the same time,the existing U-drill tool ISS26C-3D with the same turning radius and different processing materials AL3004-H32 were used to carry out drilling contrast experiments,which verified the universality of u-drill design optimization method and modified the theoretical calculation method of U-drill optimization to a certain extent.