Surface Integrity of Holes Machined by Orbital Drilling of Composites with Single Layer Diamond Tools

• DOI: 10.1016/j.procir.2016.02.067
• Publication Date: 2016-06-05T08:34:07Z
• Authors: I. Sultana; Z. Shi; M.H. Attia; V. Thomson
• Keywords: 0209 industrial biotechnology; Natural Sciences and Engineering Research Council of Canada; Drilling; General Materials Science; 02 engineering and technology; composites; superabrasive tools

AbstractOrbital drilling of composites was investigated to observe hole surface integrity in terms of surface roughness, delamination, surface burning, and geometric accuracy. Experiments were conducted with a brazed single layer diamond tool of ball-end geometry to drill 220 holes. Cutting forces and temperatures were measured. Micro-observations were made of the hole surface. The results showed that the forces increased sharply during drilling of the first 44 holes followed by a gradual rise. Part temperatures varied between 98-184°C. Surface roughness Ra varied from 13-17μm. Almost 99% of the holes were drilled without exit delamination; however, 2.3% of the holes showed entrance delamination.