Technology of hard alloy tool working capacity increase by applying composite coatings

Technological methods of increasing the working capacity of metal-cutting tools from hard alloy are reviewed. Data on the tool hardening efficiency is given. Comparative tests of the tool subjected to various types of strengthening thermoplastic processing show a relative increase in its performance. Paper presents a comparative evaluation of hard alloys and their coatings. Attention is paid to the technological control of the working capacity of the carbide tool using the coating. The structural features of working capacity control are considered in the example of composite end-to-end carbide cutters and tangential plates for restoring wheel-rolling processing. (paper)