Analysis of possibilities for modification of drill bit geometrical parameters used to drill holes in composite materials of various composition

Abstract

Purpose – The purpose of this paper is to investigate the concept of new drill bit geometry adjusted to a given composite type. This paper explores the possibility of drilling in composites without negative effects such as: delamination, rapid tool wear, matrix burns, pulling out of fibers, etc. Design/methodology/approach – Appropriate modification of drill bit geometries applied to composite materials include, among other things: modifications of point angles, reduction of chisel edge width, modification of drill margins and proper preparation of drill bit corners. Findings – Description of tool geometry for drilling of different types of composites, in particular drilling in parts included free grain surfaces but also drilling at a different angle than 90°. Research limitations/implications – Geometrical details of the tool for drilling are depended on the type of composite. Practical implications – Making of montage holes in parts made of composites without negative effects during drilling. Originalit...