Wear Mechanism Analysis of Internal Chip Removal Drill for CFRP Drilling

Abstract

Abstract Rapid tool wear is one of the main problems affecting the quality and efficiency of hole-machining in carbon fiber reinforced polymer (CFRP). As a new method for CFRP hole-machining, the suction-type internal chip removal machining methodcan effectively reduce the rate of tool wear. This paper studied the wear mechanism associated with the chip removal tool in order to further analyze the reasons for the decline in the rate of tool wear. Firstly, on the basis of the experimental conditions of internal chip removal tool wear in CFRP, experimental parameters such as drilling axial force, drilling temperature and tool wear value are obtained by experimental method, and the changes of axial force and drilling temperature during drilling process are analyzed.Secondly, the effects of drill diameter, drill point angle and rear angle on the axial force, chisel edge width, rounded cutting edge radius and width of the flank wear land are studied by using the extreme difference analysis method, and the basis for the selection of drill parameters for chip removal in CFRP is provided. Finally, on the basis of the tool wear characteristics, a comparative analysis method is used to study the variation of axial force and tool wear during CFRP hole-machining by internal chip removal and non-internal chip removal machining processes, and the reasons why the internal chip removal machining method can effectively reduce the axial force, drilling temperature and slow down the tool wear speed are analyzed.