Patent ID: 6427572
Filing Date: 2002-08-06
Classification: B22F,B26D,Y10T

Abstract:
A circular tool (10) for cutting comprising a central axial hole (11), two lateral surfaces (10a) and an outer cutting edge (12) defined by two chamfers or bevels (13a, 13b) inclined at an angle (&agr; or &bgr;) with respect to the lateral surfaces (10a), one chamfer (13a) defining a cutting side of the tool (10) and the other chamfer (13b) defining a side not directly involved in the cutting action of the tool (10), the tool (10) being able to be associated by means of the central hole (11) with a rotation shaft, the lateral surfaces (10a) having a thickness â€œsâ€  therebetween of between 2 and 4 mm and being parallel to each other, wherein only the surface defined by the chamfer (13b) not directly involved in the cutting action is covered with a protective layer (14) of material of great hardness, whereas the surface defined by the chamfer (13a) involved in the cutting action is not covered with a protective layer (14), said chamfers (13a, 13b) being initially asymmetrical with respect to the longitudinal median plane of the tool, in which the initial value of the thickness of the chamfer (13b) not directly involved in the cutting action is greater than the thickness of the chamfer (13a) defining the cutting side of the tool.