Study On The Grinding Process Of Flank Face And Related Features For Circular Arc End Mill

As a type of integrated end mill,the circular arc end mill has excellent cutting performance and is widely used in the complex curved surface processing of aerospace,rail transportation,precision instruments and other fields.The surface quality and turning outline accuracy of the flank face of the circular-end milling cutter directly affect the surface quality and processing accuracy of the machined part in actual use.The domestic research on the flank face of circular arc end mills started late.The existing research still lacks effective solutions to the problems of the flank face process,such as the surface transition is not smooth,and the turning contour is irregular.This paper analyzes the flank face and related structural features of the circular arc end mill.First,parameter models are established to describ the flank face and the flank face clearance.Then,the grinding trajectory of the flank face and the flank face clearance process is studied.Finally,the correctness of the grinding method was verified by actual machining test.Specific research content includes:(1)The flank face and the flank face clearance parameter models of circular arc end milling cuttersBy analyzing the structure of circular arc end mill,coordinate systems describing the parameter model of the flank face and the flank face clearance are defined,and then calculation and derivation of the parameter model of the peripheral edge and the end edge are completed.Based on the edge line model,the parameter model of the flank line generatrix is described.Finally,the parameterized expression of the flank face and the flank face clearance of the circular arc end mill is achieved through coordinate transformation.(2)The grinding track of the flank face of circular arc end millA four-axis grinding method for the flank face process from the peripheral edge to the end edge is defined.Through the grinding wheel attitude with the flank line generatrix defined by the workpiece coordinate system as the constraint,the four-axis continuous grinding mode from the peripheral edge to the end edge of the flank is realized,and the grinding wheel attitude is adjusted by the process parameters to avoid grinding interference,which ensures smooth connection of the flank.(3)The grinding track of the peripheral edge flank face clearanceBy defining the initial grinding attitude and process parameters of the grinding wheel,the coordinates of the grinding wheel center point and the grinding wheel axis vector are calculated,and then all the cutting edge points are traversed to form the grinding track.This process can control the width of the flank face of the peripheral edge and remove the raw surface.(4)The grinding track of the end edge flank face clearanceBy defining the initial grinding attitude and process parameters of the grinding wheel,the movement trajectory of the center point of the grinding wheel and the grinding wheel axis vector are calculated to form the grinding track.This process can remove the tip edge point,reduce the end grinding allowance,and has flexibility for the tip edge point of different positions of the tool with different tooth numbers.Finally,simulation and field machining are performed,the correctness and effectiveness of the flank face and flank face clearance process are verified by measurement,which can provide certain theoretical support for the flank face machining of circular arc end mill.