Analytical Calculation of the True Equivalent Chip Thickness for Cutting Tools and its Influence on the Calculated Tool Life

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A majority of the established systems for determination and optimization of cutting data are based on Woxén’s equivalent chip thickness, heW. In metal cutting theory and models, the equivalent chip thickness is of vital importance when the depth-of-cut ap is in the same order or smaller than the nose radius r. Woxén made considerable simplifications in his chip area model, that form the basis for calculations of the equivalent chip thickness. Basic mathematical solutions, e.g. describing the chip area on circular inserts, are lacking. This article describes the geometrical implications when machining with round inserts. The error in Woxén’s equivalent chip thickness is largest when the depth-of-cut is less than ¼ of the nose radius and are up to 40 % wrong for some combinations of cutting data in the finishing range. The presented results explain the difficulties in getting a good validity in the models used to calculate tool life in finishing machining. The error leads to an underrating of the tool load in many machining situations

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Mustafizur Rahman, Erry Yulian Triblas Adesta, Mohammad Yeakub Ali, A.N. Mustafizul Karim, Md. Abdul Maleque, Hazleen Anuar, Tasnim Firdaus Mohamed Ariff, NMohammad Iqbal, Noorasikin Samat and Noor Azlina Hassan

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80-86

Citation:

J. E. Ståhl and F. Schultheiss, "Analytical Calculation of the True Equivalent Chip Thickness for Cutting Tools and its Influence on the Calculated Tool Life", Advanced Materials Research, Vol. 576, pp. 80-86, 2012

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October 2012

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$38.00

[1] R. Woxén, Theory and an Equation for the Life of Lathe Tools, Handling 119, Ingenjörsvetenskapsakademin, Stockholm, 1932. (In Swedish).

[2] C. Bus, N. A. L. Touwen, P. C. Veenstra, A. C. H. Van der Wolf, On the significance of equivalent chip thickness, Annals of the CIRP XVIV (1971) 121-124.

[3] T. Hodgson, P. H. H. Trendler, Turning hardened tool steels with cubic boron nitride inserts, Annals of the CIRP 30 (1981) 63-66.

DOI: https://doi.org/10.1016/s0007-8506(07)60896-8

[4] T. Carlsson, T. Stjernstoft, A model for calculation of the geometrical shape of the cutting tool – work piece interface, CIRP Annals – Manufacturing Technology 50 (2001) 41-44.

DOI: https://doi.org/10.1016/s0007-8506(07)62066-6

[5] B. Colding, The machining productivity mountain and its wall of optimum productivity, 9th NAMRAC (1981) 37-42.

[6] H. J. J. Kals, J. A. W. Hijink, A computer aid in optimization of turning conditions in multi-cut operations, Annals of the CIRP 27 (1978) 465-469.

[7] J. P. Choi, S. J. Lee, Efficient chip breaker design by predicting the chip breaking performance, International Journal of Advanced Manufacturing Technology 17 (2001) 489-497.

DOI: https://doi.org/10.1007/pl00003947

[8] J. -E. Ståhl, Metal Cutting – Theories and models, Division of Production and Materials Engineering, Lund University in cooperation with Seco Tools, Textbook, (2012).

[9] P. H. Brammerts, Ursachen für Form und Massfehler an feinbearbeiten Werkstüchken, Dissertation, T. H. Aachen, (1960).

[10] B. Colding, A wear relationship for turning, milling and grinding, Doctoral Thesis, Stockholm, (1959).

[11] S. Hägglund, Global optimization of the cutting process, Licentiate Thesis, Department of Product and Production Development, Chalmers University of Technology, (2002).

[12] S. Hägglund, New procedure to optimize cutting data for general turning, Journal of Engineering Manufacture, Proceedings of the Institution of Mechanical Engineers, 217 (2003) 349-362.

DOI: https://doi.org/10.1243/095440503321590514

[13] F. Schultheiss, Duplexa rostfria ståls skärbarhet, Master Thesis, Division of Production and Materials Engineering, Lund University, 2009. (In Swedish).