Batman Universitesi Yasam Bilimleri Dergisi
www.yasambilimleridergisi.com
Cilt 5, Sayı 1  Ocak-Haziran 2015  (ISSN: 2147-4877, E-ISSN: 2459-0614)
Zülküf DEMİR

NO Makale Adı
1423658256 Investigation the Effect of Tool Geometry in Friction Drilling of A7075-T651 Alloy

Friction drilling is non-traditional hole drilling method, which uses the frictional heat due to the friction between a rotating conical tool and the workpiece to soften and penetrate the work-material, obtained a hole in a thin wall thickness material and at the result a bushing form. In this experimental study, 4 and 6 mm in thickness of A7075-T651 alloy were frictional drilled by using HSS tools with 8 mm diameter, which have 24o, 36oand 48o, conical angles. Tool cylindrical regions lengths (hl) are 8, 16 and 24 mm. 1200, 1800, 2400, 3000 and 3600 rpm spindle speeds, 20, 40, 60, 80 and 100 mm/min feed rates were selected. In experimental study the effect of the geometry of the tool, which is obtains the tip, conical, cylindrical and shoulder regions, frictional temperature and bushing shape was investigated. Consequently it was determined that the cause of the initial deformation in friction drilling operation was the tip of the tool, the conical region of the tool provided the frictional heat depending of spindle speed and feed rates. The cracks on the bushing were affected by the geometries of cylindrical and conical regions of the tool, the form of the washer was damaged with the insufficient diameter of shoulder or adhesion softens material to the cylindrical region of the tool.