H Rezghi Maleki - Assistant Professor, Department of Mechanical Engineering, University of Bonab, ۵۵۵۱۷-۶۱۱۶۷, Bonab, Iran
M M. Hamedi - Professor, School of Mechanical Engineering, University of Tehran, ۱۴۳۹۹-۵۷۱۳۱, Tehran, Iran
M Kubouchi - Professor, Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, ۱۵۲-۸۵۵۲, Japan
Y Arao - Assistant Professor, Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, ۱۵۲-۸۵۵۲, Japan

Natural fiber composites (NFCs) have strong potential to replace glass fiber reinforced plastics. Hole making is one of the most important machining operations that are performed on composite structures to facilitate the assembly operation. Understanding the effects of drilling process parameters on feature properties of NFCs has great benefits. In this regard, to make a good quality and accurate hole in composite structures, correct selection of drill bit and cutting parameters is important. This paper investigates the effect of feed, spindle speed, and three different drill bits on delamination and hole edge quality of hemp reinforced composite laminates. The results show that the drill bit type and feed have greater influences on delamination. Hole edge quality was realized to be influenced by the drill bit, while no clear effect of the feed and speed are observed.

Drilling, Delamination, Hole edge quality, Hemp