Abstract
In this chapter the work of an interdisciplinary collaboration for modeling thermomechanical deformations in dry milling and drilling processes is presented. The simulation based approach allows the prediction of structural workpiece deformation due to thermal effects occurring during the machining process. Geometric changes of the workpiece volume and the current engagement of tool and workpiece are included in the developed model. The model is applied for the optimization of NC paths with respect to workpiece deformations. The combined model is assembled by individual sub-models, which are coupled to account for interactions with each other. A dexel model is applied for contact zone analysis of tool and workpiece and also allows efficient geometric modeling of the workpiece surface. Geometric process variables of the contact zone are passed to the process model which provides thermal and mechanical loads for the thermomechanics. The thermomechanical behaviour is numerically approximated using finite elements on the time depending co-domain of the dexel model together with thermal and mechanical loads provided by the process model. In all, a closed loop between Boolean material removal, process forces, heat flux and thermo-elastic deformation is established and allows an accurate prediction of workpiece deformation and shape deviations. Furthermore, the simulation operates as a forward model for an NC path optimization. A significant improvement of form deviation is achieved with the approach.
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References
Kersting, P., Biermann, D.: Modeling techniques for the prediction of workpiece deflections in NC milling. Proc. CIRP 2, 83–86 (2012)
Bono, M.: Jun Ni: the effects of thermal distortions on the diameter and cylindricity of dry drilled holes. Int. J. Mach. Tools Manuf. 41(15), 2261–2270 (2001)
Isbilir, O., Elaheh, G.: Finite element analysis of drilling of titanium alloy. Proc. Eng. 10, 1877–1882 (2011)
Zimmermann, M., et al.: Analysis of thermo-mechanical effects on the machining accuracy when turning aluminium alloys (2012)
Fleischer, J., Pabst, R., Kelemen, S.: Heat flow simulation for dry machining of power train castings. CIRP Annals-Manuf. Technol. 56(1), 117–122 (2007)
Neugebauer, R., et al.: Thermal interactions between the process and workpiece. Proc. CIRP 4, 63–66 (2012)
Schmidt, C.: Einflussgrössensensitive Simulation und Überwachung von Fräsprozessen., Dr.-Ing. Dissertation, Leibniz Universitt Hannover, PZH Produktionstechnisches Zentrum (2011)
Denkena, B., Schmidt, C., Krüger, M.: Experimental investigation and modeling of thermal and mechanical influences on shape deviations in machining structural parts. Int. J. Mach. Tools Manuf. 50(11), 1015–1021 (2010)
Surmann, T., et al.: Simulation of the temperature distribution in NC-milled workpieces. Adv. Mater. Res. 223, 222–230 (2011)
Niederwestberg, D., Denkena, B.: Simulation of thermal and mechanical workpiece load. CIRP J. Manuf. Sci. Technol. 7(4), 315–323 (2014)
Denkena, B., Vehmeyer, J., Niederwestberg, D., Maaß, P.: Identification of the specific cutting force for geometrically defined cutting edges and varying cutting conditions. Int. J. Mach. Tools Manuf., 42–49 (2014)
van Luttervelt, A., et al.: Present situation and future trends in modelling of machining operations progress R. CIRP Annals—Manuf. Technol., 47, 587–626 (1998)
Altintas, Y.: Manufacturing Automation: Metal Cutting Mechanics, Machine Tool Vibrations, and CNC Design. Cambridge university press (2012)
Schmidt, A., Siebert, K.G.: Design of Adaptive Finite Element Software: The Finite Element Toolbox ALBERTA. Springer, Heidelberg (2005)
Niebuhr, C., Niederwestberg, D., Schmidt, A.: Finite element simulation of macroscopic machining processes—implementation of time dependent Domain and Boundary Conditions, University of Bremen, ZeTeM-Report 14-01 (2014)
Denkena, B., Schmidt, A., Henjes, J., Niederwestberg, D., Niebuhr, C.: Modeling a thermomechanical NC-simulation. Proc. CIRP 8, 69–74 (2013)
Denkena, B., Schmidt, A., Maaß, P., Niederwestberg, D., Niebuhr, C., Vehmeyer, J.: Prediction of temperature induced shape deviations in dry milling. Proc. CIRP 31, 340–345 (2015)
Denkena, B., Niederwestberg, D.: Tool path adaption for compensation of thermal workpiece deflections based on virtual machining. In: 4th international conference on virtual machining process technology (2015)
Lagarias, J.C., Reeds, J.A., Wright, M.H., Wright, P.E.: Convergence properties of the Nelder-Mead simplex method in low dimensions. SIAM J. Optim. 9(1), 112–147 (1998)
Acknowledgements
The presented results have been obtained within the research project “Thermomechanical Deformation of Complex Workpieces in Drilling and Milling Processes” (DE 447/90-3, MA 1657/21-3) within the DFG Priority Program 1480 “Modeling, Simulation and Compensation of Thermal Effects for Complex Machining Processes”. The authors would like to thank the DFG for its financial and organizational support of the project.
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Denkena, B. et al. (2018). Thermomechanical Deformation of Complex Workpieces in Milling and Drilling Processes. In: Biermann, D., Hollmann, F. (eds) Thermal Effects in Complex Machining Processes. Lecture Notes in Production Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-57120-1_11
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DOI: https://doi.org/10.1007/978-3-319-57120-1_11
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