PERFORMANCES OF MULTI-FLUTE DRILLS COMPARED TO STANDARD DRILLS
Journal Title: TEHNOMUS - Year 2013, Vol 20, Issue 1
Abstract
Multi-flute curved edge drills have constructions characterized by the geometry of the main edge having a variable clearanceangle, decreasing from top to periphery. As a result, the performances of this construction are different from those of a standard drills as far as wear behaviouris concerned regarding axial force and the torque of cutting generated in the process, as a result of increasing the active length of the main edge of the drill. The paper presents experimental research of curved edge drills, performed comparatively with standard drills, as far as wear size over time is concerned and research regarding geometric roughness of generated surface, in an identical work environment, when processing A570 type steel. The experimental research of the size of axial force and of torque, generated in the process of drilling, allowed us to determine the constants and the exponents in the relationships of axial force calculations and torque for cutting when processing alloys, with straight edge drills, as well as curved edge drills.
Authors and Affiliations
Nicuşor Baroiu, Dumitru Amarandei, Croitoru Cristian
Keywords
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