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2020
Journal Article
Titel
Reduktion thermisch bedingter Verlagerungen durch Integration von Peltierelementen in eine Hochfrequenzmotorspindel
Titel Supplements
Entwicklung einer thermo elektrisch temperierten Motorspindel
Alternative
Development of a thermoelectrically tempered motorised spindle - integration of peltier modules in a high-frequency motorised spindle to reduce thermally induced displacements based on direct temperature control
Abstract
During machining of parts, a significant proportion of geometrical errors is caused by thermally induced shifts of the positional correlation between tool and workpiece. This is due to electrical and mechanical power losses, which induce significant heat flow rates into the adjacent machine tool components. The drives and bearings of motorised spindles represent such significant heat sources. Due to their position close to the cutting point, motorised spindles have a considerable influence on the achievable working accuracy of machine tools. In order to reduce the thermal displacements of motorised spindles, the Institute for Machine Tools and Factory Management (IWF) and the Alfred Jäger GmbH develop a thermoelectric temperature control system for motorised spindles. The solution approach is based on prismatic as well as tubular Peltier modules, which allow a direct temperature control of the precisionrelated components. Especially, in case of changing induced heat flow rates, the system offers the Potenzial to maintain a thermal steady state by controlled cooling or heating and thus, a reduction of thermally induced displacements. On basis of experimentally determined data of a scaled-down test bench, the functionality of the thermoelectric temperature control system as well as the positive effects on the thermal system behaviour could be demonstrated. In addition, the current state of development of the thermoelectrically tempered motorized spindle is presented and the Potenzial to reduce thermally induced displacements is pointed out.
Author(s)