CERAMIC DRILL BIT FOR HIGH-SPEED DRILLING OF COMPOSITES

摘要

#CMT# #/CMT# The drill (1) has a cut part (3) comprising lips (8) and grooves (9) alternatively extending around a rotation axis (4) of the drill. Each lip has a fillet (12) extending radially towards the axis by an incurved chamfer (25) along a main flank surface (21) such that an intersection between the chamfer and one of the grooves is formed by an edge. A radial outer end of the edge axially extends from a cylindrical shank (2) of the drill along the axis, where the shank is a radial internal end of the edge. The incurved chamfer extends from a side of an undercut surface (30) by a chamfer (31). #CMT# : #/CMT# An independent claim is also included for a method for drilling a composite material using a ceramic drill. #CMT#USE : #/CMT# Ceramic drill for drilling a composite material such as carbon fiber composite material at high speed in an aeronautical field. #CMT#ADVANTAGE : #/CMT# The drill permits drilling of the composite material at high speed in a simple and inexpensive manner without delaminating the material and without increasing machining temperature to above 200 degree celsius to improve performance and productivity of the drill by decreasing machining time. The shank is made of resilient material grater than ceramics for effectively supporting forces applied on the drill while avoiding risk of breakage of the drill. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic side view of a drill. 1 : Ceramic drill 2 : Cylindrical shank 3 : Cut part 4 : Rotation axis 8 : Lips 9 : Grooves 12 : Fillet 21 : Main flank surface 25 : Incurved chamfer 30 : Undercut surface 31 : Chamfer #CMT#POLYMERS : #/CMT# The composite material has a matrix made of epoxy resin.