Transport tepla při kalení hřídelí větrných elektráren

Abstract

This dissertation deals with the transport of heat in quality heat treatment of wind turbine shafts. The production of drive shafts is at VÍTKOVICE HEAVY MACHINERY a.s. (VHM) for many years of tradition. During this time, the technology has undergone several major changes to meet customers' demands for strength and toughness of the shafts. Yet, in particular, the toughness values show a considerable variation in the results obtained. The intensity of the heat removal of hardened material is a decisive factor in achieving optimal mechanical properties of the material to be processed. The structure and mechanical properties of the material in which the notched toughness is important in the application depends on the correct heat treatment, which is reflected in particular at the intensity of cooling of the hardened body. The aim of the dissertation is to theoretically examine the external heat transfer during quenching of wind power shafts in water and also to determine the value of the heat transfer coefficient from the shaft material to the surroundings. Another aim is to design a measurement and modeling methodology for simulating internal heat transport, taking into account changes in physical properties of the material over time and mapping the effect of heat transport on transformation changes in the hardened body.