Session 4: Thermal robust sub-assemblies

Analyzing and optimizing the fluidic tempering of machine tool frames
A. Hellmich, J. Glänzel, A. Pierer
Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz

Thermal stabilization of frame structures by integration of demandoriented fluidic temperature control systems offers considerable potential concerning the minimization of thermo-elastic displacements and energy requirements. Additionally, by using high performance concrete, completely new possibilities for the design-wise integration of channel structures arise during casting. Thus, heat removal can be further improved by means of fluidic circuits adapted locally to the heat sources. The paper describes a developed high performance concrete (HPC) machine tool frame with integrated fluidic fluidic circuits. A special focus is laid on on modeling the structure and developing a siutable control methodology, identifying required parameters and derriving possibilities for optimization.

Simulation and analysis of the thermal behavior of a spray-cooled forming tool
J. Hepke, C. Obernaus

Thermo-mechanical interactions in hot stamping
L. Penter (a), N. Pierschel (b)
(a)    Institute of Machine Tools and Control Engineering, TU Dresden
(b)    Fraunhofer Institute for Machine Tools and Forming Technology IWU, Chemnitz

Manual, mechanical die spotting is a significant time and cost factor in the manufacturing business of forming tools. This particularly applies to warm forming, since the mechanical and geometrical properties of the part strongly depend on the tool’s cooling performance. An even distribution of the contact pressure between tool and blank is key to a uniform cooling behavior, and hence, a homogenous micro structure of the formed part. This paper presents the current developments on transitioning the spotting of hot forming tools into virtual production reality in order to reduce manual labor and lower costs. It specifically elaborates on numerical predictions of spotted tool surfaces under the influence of elastic tool and machine deformations, and furthermore, it explains the aspect of the temperature induced tool expansion and contraction. Since the character of heat transfer from workpiece to tooling mainly depends on the contact pressure on the tool surface, a correct numerical prediction of the tool’s actual surface evens the path for a virtual try-out.