Open AccessAPPLICABILITY OF COMPOSITE CUTTERS FOR MASHINING SURFACES FORMED BY A COMBINATION OF STRUCTURAL MATERIALS
Author(s) -
Е. В. Павлов,
I. М. Smirnov
Publication year - 2017
Publication title -
izvestiâ ûgo-zapadnogo gosudarstvennogo universiteta
Language(s) - English
Resource type - Journals
eISSN - 2686-6757
pISSN - 2223-1560
DOI - 10.21869/2223-1560-2017-21-2-91-98
Subject(s) - machining , vibration , mechanical engineering , boron nitride , materials science , process (computing) , cutting tool , quality (philosophy) , machine tool , structural engineering , oscillation (cell signaling) , computer science , engineering , composite material , acoustics , philosophy , physics , epistemology , biology , genetics , operating system
The paper states the difficulty of turning of structural elements of items with a combined surface, namely, a metal base surface with inclusions of polymer materials; impossibility to provide the required performance quality using traditional tool materials, especially in the areas of metal and polymer contact is shown. Major technological challenges that should be addressed as a whole while designing turning tools are presented. They are: providing shock-free conditions for digging of the cutting element in a discontinuous surface; achievement of high levels of quality and accuracy of the surface formed by the combination of dissimilar structural materials; damping of oscillations caused by the discontinuous nature of the cutting process. Several designs of turning tools with damping elements suitable for oscillation and vibration damping were reviewed. The nature and extent of the influence of intermittent cutting conditions when damping vibrations and loads on the machining quality levels and tool life were investigated. The main characteristics and features of the considered designs of cutting tools were studied; design and engineering solutions for the implementation of tools with damping properties into the production process were proposed; ways for abatement of vibrations arising in the process of turning of combined surfaces were recommended. Performance testing of new designs of cutters under conditions of intermittent cutting of structurally complex surfaces of machine parts operating under alternating loads showed high performance of super-hard tool materials based on cubic boron nitride. Under damping while turning parts made of HH 40KHN, 12KHN3A steel, the quality of the machining of the seventh quality grade with the index of roughness of the processed surface Ra ≤ 0.63 µm, including surface cutting, which is a combination of several structural materials, was achieved.