Porovnání živostnosti fréz upnutých v termoupínačích oproti jiným způsobům upínání nástrojů

Abstract

The submitted thesis deals with the problems of selecting appropriate tool holders for the manufacturing of complex components on CNC milling machines. The present time brings a massive application of CNC machine tools and an overwhelming majority of newly acquired machine tools fall to this category. By acquiring numerically controlled machines, operators gain new sales opportunities for supplies of both high quality machined components in the case of cooperation production and complete units. To ensure the optimum economy and thus the maximum machine time utilization it is necessary to use high quality and powerful tools. The service life of, in particular, rotating tools is to large extent influenced also by the properties of the tool holders used. The correct selection of milling fixtures can substantially extend the life of such tools, it has an influence on the quality of the machined surface and, obviously, also on the productivity of an entire production unit. The professional public have different opinions on using various types of fixtures. These opinions are based on personal experience and they are usually not supported by exact measurements. The introduction of the thesis describes the properties of modern tool materials manufactured by powder metallurgy including a description of the manufacturing of rotating milling tools and their coatings. The following chapter describes tool systems used in industrial practice. This chapter is followed by a detailed description of thermal fixtures including their accessories. The next chapter describes the preparation of experimental measurements including the necessary theory and description of the machines and instruments used. The last chapter provides an evaluation of the measured data in relation to the clamps used and data acquired by an analysis of the roughness reached in relation to acoustic signs during machining including the benefit for practical applications and for science.