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Extended bisection method for parameter identification of the transient heat conduction equation for thermo-elastic deformations during drilling

Erweitertes Bisektionsverfahren zur Parameteridentifikation der instationären Wärmeleitungsgleichung für thermo-elastiche Verformungen beim Bohren
: Glänzel, Janine; Meyer, Arnd; Unger, Roman; Bräunig, Michael; Wittstock, Volker; Ihlenfeldt, Steffen


The International Journal of Advanced Manufacturing Technology 88 (2017), Nr.5, S.1279-1288
ISSN: 0268-3768
ISSN: 1433-3015
Fraunhofer IWU ()
adaptive FE simulation; thermo-elasticity; parameter approximation; temperature simulation in nc-drilled workpieces

A new interdisciplinary approach is discribed to identifying unknown parameters using an extended version of the known interval bisection method. This developed method is based on the use of finite elements for calibrating the simulation calculation. The resulting thermo-elastic deformations which occur in drilling processes with impaired cooling lubrication are to be used as correction values for tool positioning in the NC control. Based on the strong impact on workpiece temperature of machining, a simulation approach is presented for calculating the temperature fields and their thermo-elastic consequences. In addition, methods are presented to correct these effects. This paper particularly deals with the temperature fields of drilling operations. Special attention is paid to the technique employed for iterative numerical determination of the unknown heat flux ηw and heat transfer coefficient (Formula presented.) values.