Cutting member with dual profile tip

Abstract

The invention relates to a cutting member () includes a plate-shaped substrate () on which a tip () is provided which is bounded by a cutting edge (). According to the invention, the tip includes an ultimate tip () and a basic tip (), the ultimate tip extending from the cutting edge over a distance dand having a profile which at least approximates the equation w=a.d, and the basic tip connecting to the ultimate tip and having a profile which at least approximates the equation w=a.(d+R), where w is a profile thickness (in μm) and d is a distance (in μm) from the cutting edge (), and nis smaller than n, and a=a.(d+R)/d. In this manner, the profile of the ultimate tip is relatively robust and the profile of the basic tip is relatively slender, as a result of which the cutting member has a comparatively high resistance to wear, and the cutting forces of the cutting member are comparatively small. In one example, n=n.d/(R+d), resulting in the basic tip () connecting to the ultimate tip () without a kink, so that the cutting forces are further reduced. In another example, the ultimate tip and the basic tip comprise a coating () made from a material, for example diamond-like carbon, having a higher modulus of elasticity than the material from which the substrate () is made.