A METHOD FOR DETERMINING THE OPTIMAL DIMENSIONS OF A TWO-STAGE DRILL
Keywords:
spiral drill, optimal dimensions, cutting edge, open and closed holesAbstract
The methods of machining holes in various materials with rotating tools, in particular determining the optimal sizes of two-stage drills that can find application for processing open and closed holes in hard-to-process metals and composite materials are considered.
A new method has been developed for determining the optimal dimensions of a two-stage drill, according to which the diameter of the first degree d is changed, after each change, the drilling torque of the Mkr and the total axial force Po are calculated or measured, the known product of the MkrRo is calculated, characterizing the total force loading of the drilling process, with which the drilling diameter of the first degree d is determined, at which the MkrPo has a minimum value:
It is established that the proposed method of manufacturing two-stage drilling reduces the average temperature, drill removal and vibrations during drilling, reducing the overall load of the drilling process to 2.4 or more times:
