ДОСЛІДЖЕННЯ ТОЧНОСТІ ОТВОРІВ У ВОЛОКНИСТИХ ПОЛІМЕРНИХ КОМПОЗИЦІЙНИХ МАТЕРІАЛАХ ПРИ ОБРОБЦІ СВЕРДЛАМИ З ДИСКРЕТНИМИ ПОКРИТТЯМИ ГЛОБУЛЯРНОГО ТИПУНА РОБОЧІЙ ПОВЕРХНІ

Abstract

The article considers the main brands of tool materials used for cutting tools used for processing fibrous polymer com-posite materials (FIC) and sets requirements for them. The analysis of advantages and disadvantages of their application is carried out. It is noted that to increase the wear re-sistance of cutting tools made of high-speed steels and carbide alloys for processing fibrous polymeric composite materials are currently used continuous coatings based on TiC, TiN, TiCN, TiALON, AlCrN and others, however, the use of such coatings does not significantly increase resistance due to the impossibility of providing in the process of cutting a small radius of rounding of the cutting edge. It is shown that diamond coatings are predominant for the processing of fibrous polymeric composite materials, but there is a problem of creating the necessary adhesion and high cost of the tool with this coating. Competitive and promising method of applying wear-resistant coatings is the method of electrospark alloying (ESA), which in comparison with other methods has both a significantly lower magnitude of energy consumption and a cost of equipment. The article presents the results of re-search to determine the accuracy of holes in parts made of fibrous polymeric composite materials, namely fiberglass STEF-U when processing drills from high-speed steel with the discrete covering of globular type put on its working surfaces in comparison with drills with a diamond covering. The obtained research results showed that the obtained values of deviation from the roundness of machined holes meet the requirements for holes for fasteners, and this indicates the possibility of equivalent replacementof drills with polycrystalline diamond coating on drills made of high-speed steel type, which will reduce the cost of the tool and therefore the cost of the finished product without losing the accuracy of processing.