MILLING OF HIGH-HARD MATERIALS WITH A PREFABRICATED END MILL
The requirements for the properties of materials are growing rapidly. For example, in the defense and space industries, the hardness of materials at the level of HRC 50 does not meet the requirements. Hardness of HRC 65 and above is needed. Moreover, this hardness is needed in the surface layer, and the substrate must have a hardness at the level of HRC 35. Technologies for obtaining such sandwich materials with a gradient of properties have been developed. It is known that such materials are obtained by static-pulse loading of the deposited material while it is still in a hot state. But there is another process in which the surface layer is obtained by surfacing with special powder wires. The undulation and roughness of such a layer are unacceptable for the part. Mechanical processing is required. Grinding is unacceptable for various reasons. The rationality of the use of end-end prefabricated milling cutters with mechanical fastening of polyhedral carbide cutting plates for processing such deposited materials is investigated. Rational parameters of the cutting mode are established, recommendations on the use of such cutters are given. The mechanisms of wear and destruction of cutting plates at different cutting speeds, feeds and cutting depths are established, a forecast is made for improving the performance of such cutters.