Model Based Prediction Approach for Internal Machine Tool Heat Sources on the Level of Subsystems

Abstract

Modern machine tools are highly sophisticated mechatronic systems. Each subsystem's energy efficiency is important regarding thermal effects of the machine: Losses in the subsystems are mainly heat sources, causing temperature gradients and thermal elongation. Knowledge about the internal heat sources is therefore mandatory for high precision machining, as well as for the design of compensation strategies. This paper presents a modeling approach to estimate the heat release of machine tool subsystems and predict boundary conditions for thermal models. The simulation results are verified by measurements on an internal cooling system of a lathe.

Thermal Simulations Based on Macro-Models

“…The method produces a description of the properties of a fluid in one dimensional dependency. The properties of the macro-element depend on the properties of the fluid, the duct geometry and the operational point [1,2]. The properties of a wall like roughness also influence the results [9].…”

“…The theoretical properties of the macro-elements presented in [2] were stated by using the equation for laminar and turbulent flow as presented in [7]. To verify the results of this theoretical equation, two commercially available CFD simulation software solutions are used: Ansys and Siemens NX.…”