My final thesis deals with slightly bent induction hardened steel shafts. The aim is to find parameters which would make them straight enough for their use in sensors, in accordance with tolerances of an absolute linear shaft encoder.
Shaft structure and theoretical background are presented to argument the selection of researched parameters. Some parameter values are chosen by calculation and some are based on available literature and previous researches. The basic working principle of an absolute linear shaft encoder is described with intent of explaining the need for shafts to be so straight. The thesis work includes the method of preloading, heat treatment, straightness measuring, hardness measuring and numerical simulation.
Experimental work guides us through different intentions of shaft straightening at different temperatures and times of heat treatment. The general condition of shafts before straightening was examined. Shafts were then preloaded and exposed to different temperatures for different time. The procedure of straightening was affected by regularly analysed results.
Most appropriate parameters were chosen based on straightness improvement and loss of hardness. Considering the necessary and sufficient conditions for the use in sensors, the usefulness of proposed method was evaluated for its use in industrial production.