Research Information System
Thesis Type: Doctorate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2016
Student: SELÇUK YAĞMUR
Supervisor: ULVİ ŞEKER
Open Archive Collection: AVESIS Open Access Collection
Abstract:Composite materials, used in aviation and automotive industries, are usually produced from carbon fiber reinforced epoxy or vinyl esters. Machining these composite materials is harder than machining the other materials. In this study, a unique PCD cutting tool design was devised which is capable of eliminating the encountered difficulties, especially the exfoliation (delamination) problem on laminated/laminar formed composite board during machining carbon fiber reinforced composite (CFRC) materials. After manufacturing the cutting tools, the tools's performances were tested on CFRC materials. The designed and producted PCD end mills had 3 different geometries. The tests were conducted on CNC vertical machining center. The first tool's first clearance angle is 8o and second clearance angle is 17o. The second tool's first clearance angle is 11o and second clearance angle is 20o. The third tool's first clearance angle is 13o and second clearance angle is 25o. One of the three cutting edges has left helix angle, another cutting edge has right helix angle and the other cutting edge has no angle for easing the penetration. 350, 400, 450 m/min cutting speeds and 1270 mm/min constant feed rate were selected as cutting parameters. The first tool showed the best performance in consequence of the tests. Increasing cutting speed influences the cutting forces, delamination width and surface roughness posivitely. Besides, the effective parameters on surface roughness, cutting forces, delamination width and tool wear were determined according to the obtained ANOVA statistics after the regression analysis.