THE VERIFICATION OF AXIAL FORCES AND TORQUES IN DRILLING BY THE NONCOATED CUTTING TOOLS AND DRILLS WITH PVD TIN COATING

摘要

The main aim of this scientific paper is to assess the contribution of surface layers of bearing steel by determining the experimental measurement of cutting forces in the drilling technology with the drilling cutting tools made of uncoated high speed steel and also with coated by the PVD method. This experimental paper is a continuation of the solutions of grant VEGA no. 1/9428/02 titled "The technological heredity of the machined surfaces - surface integrity". The first chapter of this scientific study discussed about the possibilities and technological challenges in drilling of bearing steels. The second chapter discusses about technological characteristics of cutting process and cutting forces. In the third and fourth chapter is described the measurement of cutting forces in drilling by the piezoelectric Kistler dynamometer. This paper, together with published results is a basis that will enable optimizing the quality of drilling production process, automotive parts of their dominant functional areas. The process of drilling was carried out in triaxial CNC milling machines with post iTNC530 HEIDENHAIN control systems. During drilling through dynamomatra were measured axial cutting forces and torques.