IMPROVING EFFECTIVE OUTPUT AND HOLE PROCESSING QUALITY BASED ON CUTTING PROCESS DYNAMICS ESTIMATION

Abstract

The purpose of the work is to improve the dynamic stability and productivity of hole processing. METHODS. The scientific fundamentals of the technology of mechanical engineering and material cutting, modeling and active experiment form the theoretical basis of research. The experimental data are obtained with the help of measuring means including the program complex based on the Taylor Hobson Form Talysurf i200 profilometer, Carl Zeiss CONTURA G2 coordinate measuring machine, Zoller Genius 3 geometric parameter monitoring device, Kistler 9129AA and 9253B23 dynamometer complexes, CutPro hardware- software complex and others. RESULTS AND THEIR DISCUSSION. The developed mathematical model of the drilling process allows to solve the task of improving productivity, surface quality and accuracy of holes in the parts made of aluminum alloys by choosing optimal cutting conditions on the basis of the dynamic stability diagram. The created mathematical model of hole accuracy dependence on the length of the twist drill working part and the cutting modes enables the prediction of the hole accuracy as early as at the design stage of the technological process. The calculated modal parameters of instrumental adjustment for a solid carbide drill can be used in plotting drilling process stability diagrams. The developed procedure for studying clamping chucks allows to evaluate their effect on the dynamic stability of the drilling process as well as to estimate their effect on the quality and accuracy of produced holes. CONCLUSIONS. Having considered the results of experimental studies, it was proposed to use a hydroplastic chuck when drilling holes with the required accuracy in accordance with H7-H8. The experimentally determined coefficients of the cutting force model allow to take into account the physicomechanical properties of aluminum alloys V95pchT2, 1933T2, 1163T when modeling the drilling process both in special software products and using high-level programming languages.