An Experimental Investigation of the Influence of Point Angle and Fluctuation in Thrust Force On Chip Morphology

Abstract

Drilling is a widely used machining method in engineering applications, playing a majorpart in machining operations. Chip morphology is an indicator, which shows thequality of machining. Especially, chip thickness ratio is a characteristic to show the levelof deformation and cutting effects during machining operations. In the present paper, theinfluences of parameters such as feed rate, spindle speed, point angle, and fluctuation sizeon the chip morphology investigated. The most influential parameter on the chip thicknesswas feed rate, while point angle on the chip width. The most favourable chip thicknessratio values and a lower fluctuation size in thrust force were achieved at 100o and 118o pointangles. Although the higher fluctuation in thrust force and chip thickness ratio values wereobserved at 136o and 154o point angles, the most favourable chip morphology was obtainedat these point angles. In other words, the higher point angles were found to be advantagesin drilling operations to obtain a better chip morphology and chip geometrical dimensions.