EFFECTIVE WAYS OF SHARPENING METAL-CUTTING TOOLS MADE OF RAPID STEEL AND HARD ALLOYS

The problems of increasing the efficiency of the sharpening operation of metal-cutting tools made of rapid steel and sintered-hard alloys are viewed. Cutters with sintered-hard alloy plates, as well as high-speed steel drills, have been on the tapis as metal-cutting tools. The paper examines various methods of sharpening metal-cutting tools for increasing their durability, as well as stable durability maintaining after regrinding. The influence of various sharpening methods on various merit rates, such as surface roughness, microhardness and the amount of transcrystalline stresses in the material, has been studied as well. Research for the durability period determination in turning carbide plates were carried out under turning process of stepless rollers made of chromium-nickel alloy, and drills made of rapid steel, when drilling holes in boiler steel. According to the research results, it can be seen that these methods can significantly increase the durability period of the sharpened tools. Research for the durability period determination in turning carbide plates were carried out under turning process of stepless rollers made of chromium-nickel alloy, and drills made of rapid steel, when drilling holes in boiler steel. According to the research results, it can be seen that these methods can significantly increase the durability period of the sharpened tools. The results showed that these combined methods can increase the durability of tools by another 15…20 %. Thus, taking into account the results of the performed studies using high-tech methods for sharpening metal-cutting tools made of rapid steel and sintered-hard alloys, it can be concluded that the sharpening method is highly effective, being based on the use of grinding abrasive wheel, which is chromium-impregnated and while supplying of an iodine-containing liquid coolant to the work zone. It was found that when using this sharpening method, a higher resistance index is achieved in two-component carbide plates of turning cutters, if comparing to single-component carbide plates.

sharpening method, cutter, drill bit, durability, sintered-hard alloy, rapid steel, chromium diiodide