Analýza vlastností svěrných spojů

Abstract

The present dissertation deals with the analysis of the properties of clamping joints. The properties of clamping joints are quite numerous and affect the function of the joint in different ways. In the introductory chapter, the thesis deals with the analysis of clamping sleeves used today by several globally recognized companies dealing with this issue. In this chapter the area of interest is further narrowed down to clamping sleeves with tapered segments. These have been divided into two major chapters, namely inner and outer bushings. In this chapter the thesis also deals with the calculations given in the manufacturers' catalogues FEM analysis is very crucial for the whole thesis, but it needs to be verified. Its verification is done in several ways. Considering the catalogue values of pressures in the manufacturer's catalogue. Another way is verification on a bursting machine under axial load. The last way of verification is the variation of the axial force on the bolts of the clamping sleeve under axial load. The thesis is not only based on the Finite Element Method, but also on analytical calculations. For example, the calculation of stresses under the clamping sleeve using multi-axial stresses. This calculation was further used to determine the stress concentration factor with respect to the stress values determined by FEM. The finite element method itself was divided into several analyses. The most simplified is the analysis dealing only with the shaft. The casing is replaced by the pressure. In this analysis, in addition, the loads were also added incrementally so as to identify the effects of each load. Another analysis is to determine the effect of cylindricity on the quality and magnitude of pressure under the clamping sleeve The rest of the thesis is experimental and deals with the effect of lubrication on the quality of the tightening of the sleeve. This quality has a major influence on the bending stress on the clamp bolts. I have also looked at the roughness of the shaft surface after tightening the clamping sleeve on the shaft several times with half the tightening torque on the bolts