Ensuring the quality of holes in parts made of polymer composite materials with drills with modified working surfaces

The article is an overview and information. Trends in recent years in various branches of mechanical engineering indicate the increasingly widespread use of composite materials (CM). Among the wide class of CM used for the manufacture of various parts in aircraft, rockets, shipbuilding, and power engineering, polymer composite materials (PCM) have become widely used. High specific strength, manufacturability and rigidity, and relatively low cost make PCM an indispensable alternative to metal materials used earlier. Parts and structures made of PCM are assembled with parts and structures made of metal materials. The vast majority of such connections are made by installing connecting elements (bolts, rivets) in pre-machined holes, creating, among other things, point mechanical connections. The main technological factor for ensuring the reliability of these connections is, first of all, the quality of the surface and the accuracy of the holes obtained. Failure to comply with quality parameters can lead to high contact loads, reduced service life, and destruction of the structure (unit). Technological processes that ensure the quality parameters of holes after machining are largely dependent and determined by the use of a special cutting tool. The issue of using cutting tools with modified working surfaces in the form of discrete areas for machining parts made of polymer composite materials (PCM) has not been sufficiently studied to date, therefore it is relevant.