INCREASING PRODUCTIVITY OF COMBINED PROCEDURE BY REDUCING GRINDING ALLOWANCE

Authors

  • János Kundrák UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary;, Hungary
  • István Deszpoth UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary, Hungary
  • Viktor Molnár UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary, Hungary

DOI:

https://doi.org/10.20998/2078-7405.2019.90.04

Keywords:

hard machining, combined procedure, gear wheels, operational allowance, surface quality, 3D topography.

Abstract

Experiments were carried out to determine the minimal extent of acceptable grinding allowance on case-hardened workpieces machined by combined procedure. The extent of acceptable or unacceptable allowance was determined by a “painting” method. After bore grinding tests for 2D roughness, roundness and 3D topography measurement were carried out. It was found that a 0.03 mm allowance in the bores of gearbox wheels of cars is satisfactory and also necessary to obtain the required level of topography when combined machining was applied and when no white layer formed in the turning procedure. This is a significant finding, because the usual allowances of 0.05 mm or higher (in many cases significantly higher) can be decreased to 0.33 mm and the machining time of bore grinding can be reduced in proportion to this extent.

Author Biographies

János Kundrák, UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary;

Prof. Dr. habil Dr.h.c., DSc, UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary

István Deszpoth, UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary

UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary

Viktor Molnár, UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary

UNIVERSITY OF MISKOLC Faculty of Mechanical Engineering and Informatics Institute of Manufacturing Science, Hungary

References

Lutjens, P.: Grosse Vorteile durch Kombinationsbearbeitung, Werkstatt und Betrieb 9, 2008, pp.114–119.

Kundrak, J., Deszpoth, I., Molnar, V.: Comparative Examination for the Machining of Hard Surfaces, International Conference on Innovative Technologies: IN-TECH 2012, Rijeka, 2012, pp.305–309. 5 p.

Kundrak, J., Molnar, V. Deszpoth, I.: Comparative Analysis of Machining Procedures, Machines 6(2), 2018, Paper 13, p.6.

Kundrak, J.: Alternative Machining Procedures of Hardened Steels, Manufacturing Technology 11, 2011, pp.32–39.

Klocke, F., Brinksmeier, E., Weinert, K.: Capability Profile of Hard Cutting and Grinding Processes, CIRP Annals - Manufacturing Technology 54 (2), 2005, pp.557–580.

Kundrák, J., Gyáni, K., Deszpoth, I.: The Efficiency of Combined Machinings, Rezanie i Instrumenty v Tekhnologicheskih Sistemah 81, 2012, pp.140–151.

Kundrak, J., Varga, G., Deszpoth, I., Molnar, V.: Some Aspects of the Hard Machining of Bore Holes, Applied Mechanics and Materials 309, 2013, pp.126–132.

Knuefermann, M.M.W., McKeown, P.A.: A Model for Surface Roughness in Ultraprecision Hard Turning, CIRP Annals, 53, 2004pp.99–102.

Kundrak, J., Molnar, V., Deszpoth, I.: Analysis of Machining Time and material Removal Performance as Factors Influencing Efficiency and Profitability, Lecture Notes in Mechanical Engineering, 2018, pp.268–279.

Tonshoff, H.K., Arendt, C., Ben Amor, R.: Cutting of Hardened Steel, CIRP Annals - Manufacturing Technology, 49(2), 2000, pp.547–566.

Dornfeld, D., Lee, D.-E.: Precision Manufacturing, Springer, 2008p.41.

Kosilova, A.G., Mescheryakov, R.K.: Spravochnik tehnologa-mashinostroitelya, Moskva Mashinostroenie, 1985, str.19.

Khonsari, M.M.: Applied Tribology, Wiley, 2008, p65.

Waikar, R.A., Guo, Y.B.: A Comprehensive Characterization of 3D Surface Topography Induced by Hard Turning versus Grinding, Journal of Materials Processing Technology 197, 2008, pp.189–199.

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Published

2019-05-01

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