Effects of Cutting Parameters on Delamination in Machining for S 2 Glass Fiber Reinforced Polymer Composites

CUTTING PARAMETERS AND DELAMINATION IN S2 GLASS COMPOSITES

Abstract

Fiber-reinforced polymer composite materials are new engineering materials that are preferred in engineering applications due to their superior properties. Today, S 2 glass fibers are used as reinforcement elements in composite applications requiring high strength. Polymer composite materials are usually produced close to their final shape. In order to perform mechanical joining operations on these materials, additional machining operations are required. Drilling and milling operations are the most preferred machining processes for polymer composites. The holes and grooves opened for the bolts and rivets used in the joining processes are required to be of high quality. In this study, the machinability properties of S 2 glass fiber-reinforced polymer composite materials with an average thickness of 1.8 mm are investigated by drilling and grooving operations. Machinability experiments are carried out in a dry environment using different cutting parameters in a CNC milling machine (Drilling-VMC850B branded CNC, Grooving-Skilled 2040 CNC). The deformation on the surfaces has been visualized and examined using an optical microscope. As a result of machining operations, it has been determined that the drill bit angle is the most important parameter for the drilling process, and there is less deformation in the channels opened in the 45° direction for the grooving process. The roughnesses formed on the hole and groove surfaces were measured and the most effective parameters were found. The effective parameters for drilling tests were the tip angle; for grooving tests, the speed and the number of revolutions.