Influence of Solid Contaminants in Metal Working Fluids on the Grinding Process

Abstract:

Metal working fluids (MWF) are widely used in grinding processes to lubricate and to remove the heat and chips from the contact zone. Apart from the chips, abrasive particles from the worn grinding wheel contaminate the metalworking fluid. The solid contaminants, in particular the abrasive particles crumbled from the grinding wheel, are believed to cause several negative effects like for example damaging the guideways of the machine tool. Furthermore, it is assumed that a pronounced interaction of the solid particles and the machined surface will decrease the achievable surface quality of the ground surfaces. Cleaning units are employed within the fluid circuit to prevent failure of the machine tool and to ensure the desired surface quality. The economic efficiency of such cleaning plants cleaning plants depends strongly on the choice of the grade of filtration (the particle size which has to be retained). A grade of filtration which exceeds the actual needs of the machining process adds unnecessary costs for operating the cleaning unit. To enable cost efficient design of filtration units the interaction between solid contaminants and the machining process has to be understood. The results of grinding experiments (face grinding of workpieces made of AISI 52100) confirm a significant increase of the surface waviness when corundum particles are added to the MWF. The underlying effect is an extraordinary tool wear combined with a locally varying effective depth of cut. The excess particles block the pores of the grinding wheel and are transported into the grinding gap. An increasing ratio of the size of solid contaminants and the size of the bonded grains on the wheel accelerates the wear of the tool.

• Periodical: Advanced Materials Research (Volume 769)
• Pages: 61-68
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.769.61
• Online since: September 2013
• Authors: Björn Beekhuis
• Keywords: Cooling, Grinding, Surface Integrity

References

[1] E. Brinksmeier, C. Heinzel and M. Witmann, Friction, Cooling and Lubrication in Grinding. CIRP Annals - Manufacturing Technology Volume 48, Issue 2, 1999, Pages 581 - 598.

DOI: 10.1016/s0007-8506(07)63236-3

[2] C. Heinzel and G. Antsupov, Preventation of wheel clogging in creep feed grinding by efficient tool cleaning, CIRP Annals - Manufacturing Technology Volume 61, 2012, Pages 323-326.

DOI: 10.1016/j.cirp.2012.03.056

[3] K. Wegener, H.-W. Hofmeister, B. Karpuschewski, F. Kuster, W.-C. Hahmann, M. Rabiey, Conditioning and monitoring of grinding wheels, CIRP Annals - Manufacturing Technology Volume 60, 2011, Pages 757 - 777.

DOI: 10.1016/j.cirp.2011.05.003

[4] J. Webster, Grinding coolant Application Metters, Manufacturing engineering Volume 140, Issue 3, Pages 19 - 25.

[5] E. Brinksmeier, M. Garbrecht, C. Heinzel, Th. Koch, J. Eckebrecht, Current Approaches in Design and Supply of Metalworking Fluids Tribology Transactions 52, 2009, Pages 591 - 601.

DOI: 10.1080/10402000902825739

[6] G. Grigo, Aufgaben der Filtration von Kühlschmiermitteln, 13th International Colloquium Tribology, Ostfildern, Technische Akademie Esslingen, 2002, Pages 1597-1609.

[7] K. Southerland, Machining and processing – managing cutting fluids used in metal working, Filtration & Separation Volume 45, Issue 7, September 2008, Pages 20 - 23.

DOI: 10.1016/s0015-1882(08)70257-x

[8] P.S. Sheng and S. Oberwalleney, Life-cycle planning of cutting fluids - A review, Transactions of the ASME, Journal of Manufacturing Science and Engineering, Volume 119, Issue 4B, 1997, Pages 791 - 800.

DOI: 10.1115/1.2836826

[9] International Standard 16889, Hydraulic fluid power – Filters – Multi-pass method for evaluating filtration performance of a filter element, Second edition June 2008.

DOI: 10.3403/02079670u

[10] A. Califice, F. Michel, G. Disclaire, E. Pirad, Influence of particle shape on size distribution measurements by 3D and 2D image analysis and laser diffraction, Powder Technology 237, 2013, Pages 67 - 75.

DOI: 10.1016/j.powtec.2013.01.003

[11] F. M. Etzler and R. Deanne, Particle Size Analysis: A Comparision of Various Methods II, Particle and Particle Systems Characterization Vol. 10, Issue 14, 2004, Pages 278 - 282.

DOI: 10.1002/ppsc.19970140604

[12] M. Konert and J. Vandenberghe, Comparision of laser grain size analysis with pipette and sieve analysis: a solution for underestimation of the clay fraction, Sedimentology Volume 44, Issue 3, June 1997, Pages 523 - 535.

DOI: 10.1046/j.1365-3091.1997.d01-38.x