Side milling cutters with working elements made of high-speed steel powder. II. Properties of cutting materials

Investigations were carried out into the materials for blanks of side milli ng cutters produced from highspeed steel powder by hot upsetting ring-shape d porous blanks with the centripetal flow of the material. A method of eval uating the qualify of material on the basis of the density and specific wor k of failure of specimens, cut from the discs in different areas and in dif ferent directions, was developed and applied for this purpose. The use in t he blank of a central insert produced from rolled structural steel results in higher properties ("the head" effect). The results of testing the durabi lity of cutters with working elements produced from high-speed steel powder show that their durability decreases less rapidly with increasing cutting speed than that of the cutters made of rolled material.