Thermal Modelling of Drilling Steel

Abstract:

The modelling of machining operations aiming at the compensation of thermal effects regarding workpiece distortion requires detailed knowledge of the thermal impact of the examined process. The objective of this paper is therefore to form an empirical basis for the modelling of the heat flux into the workpiece in drilling of steel. In order to achieve this goal the temperature matching technique in combination with two dimensional thermographic measurements was utilised. The moving heat source was characterised as a primary heat source with a constant heat flux density near the cutting zone and a secondary declining heat source on the bore hole wall. With an iterative approach it was possible to match the simulated temperature fields very closely to the measured temperature fields. The evaluation of the thermal impact of the drilling process with varying machine parameters yielded additional insight into the generation and distribution of thermal energy in drilling. The lowest overall heat partition to the workpiece was observed at the higher feed rate in combination with the lower cutting speed where the heat partition in the cutting zone as well as heat transfer to the bore hole wall are minimal.

• Periodical: Advanced Materials Research (Volume 1140)
• Pages: 205-212
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1140.205
• Online since: August 2016
• Authors: Maxim Gulpak*, Jens Sölter
• Keywords: Drilling, Steel, Thermal Effects

References

[1] J.C. Aurich, M. Zimmermann, S. Schindler, P. Steinmann, Analysis of the machining accuracy when dry turning via experiments and finite element simulations. Production Engineering, Research and Development 8 (2013) 41-50.

DOI: 10.1007/s11740-013-0508-9

[2] J. C. Jaeger, Moving Sources of Heat and the Temperature at Sliding Contacts. Journal and Proc. of the Royal Society of New South Wales 76: 3 (1942) 203-224.

DOI: 10.5962/p.360338

[3] M. Dyck, Beitrag zur Analyse thermisch bedingter Werkstückdeformationen in Trockenbearbeitungsprozessen. Dr. Ing. Dissertation wbk Institute of Production Science Karlsruhe (2007).

[4] D. Biermann, I. Iovkov, Investigations on the thermal workpiece distortion in MQL deep hole drilling of an aluminium cast alloy. CIRP Annals - Manufacturing Technology 64: 1 (2015) 85-88.

DOI: 10.1016/j.cirp.2015.04.072

[5] R. Pabst, J. Fleischer, J. Michna, Modelling of the heat input for face-milling processes. CIRP Annals – Manufacturing Technology 59: 1 (210) 121-124.

DOI: 10.1016/j.cirp.2010.03.062

[6] J. Sölter, M. Gulpak, Heat partitioning in dry milling of steel. CIRP Annals - Manufacturing Technology 61: 1 (2012) 87-90.

DOI: 10.1016/j.cirp.2012.03.046

[7] G.M. Pittala, A New Approach to the Prediction of Temperature of the Workpiece of Face Milling Operations of Ti-6Al-4V. Applied Thermal Engineering 31 (2011) 173-180.

DOI: 10.1016/j.applthermaleng.2010.08.027

[8] H. Wernsing, M. Gulpak, C. Büskens, J. Sölter, E. Brinksmeier, Enhanced method for the evaluation of the thermal impact of dry machining processes. WGP Prod Eng Res Devel 8 (2014) 291-300, DOI: 10. 1007/s11740-013-0523-x.

DOI: 10.1007/s11740-013-0523-x

[9] N. N., Taschenbuch der StahlEisen-Werkstoffblätter. Verein Deutscher Eisenhüttenleute (Ed. ), Verlag Stahleisen, Düsseldorf (1997) 110.

DOI: 10.1002/mawe.19730040413