1. bookVolume 14 (2014): Issue 3 (June 2014)
Journal Details
License
Format
Journal
eISSN
1335-8871
First Published
07 Mar 2008
Publication timeframe
6 times per year
Languages
English
Open Access

Method of Maintaining the Required Values of Surface Roughness and Prediction of Technological Conditions for Cold Sheet Rolling

Published Online: 17 Jun 2014
Volume & Issue: Volume 14 (2014) - Issue 3 (June 2014)
Page range: 144 - 151
Received: 20 Aug 2013
Accepted: 28 Jun 2014
Journal Details
License
Format
Journal
eISSN
1335-8871
First Published
07 Mar 2008
Publication timeframe
6 times per year
Languages
English
Abstract

The paper is based on results obtained from topography of surfaces of sheets rolled from deep-drawing steel of the type KOHAL grade 697, non-alloy low-carbon structural steel EN 10263-2:2004 and aluminium. The presented results document correctness of the assumption that the rolling force Froll increases with the increasing reduction Δh and the quality of the rolled surface is improved at the simultaneous increasing of strength of rolled sheets and the decreasing of size of structural grains. The experiment was performed on the two-high rolling stand DUO 210 SVa, which enables only non-continuous technology in contrast to the rolling mill with continuous reduction on one sheet in several degrees on rolling trains, in consequence of which the obtained height parameters of the section are in close correlation with the predicted dependence. Contribution of the work consists in the creation of a mathematical model (algorithm) for predicting technological parameters of the two-high rolling stand DUO 210 SVa at change of the absolute reduction Δh, for example for a deep-drawing steel of the type KOHAL grade 697 and non-alloy lowcarbon structural steel PN EN 10263-2:2004 and aluminium, and also in the development of a method of calculation applicable to any material being rolled in general, because the authors have found that various materials can be differentiated by a derived analytical criterion IKP. This criterion is a function of ratio between the modulus of elasticity of reference material and that of actually rolled material. The reference material is here deep-drawing steel of the type KOHAL grade 697. Verification was carried out by measuring changes of final surface roughness profile and final strength of rolled sheets of the stated materials in relation to reductions and those were compared with theoretically predicted values. It is possible to identify and predict on the basis of this algorithm an instant state of surface topography in respect to variable technological conditions. On this basis it is then possible to calculate and plot individual main technological parameters.

Keywords

[1] Garber, E., Traino, A., Kozhevnikova, I. (2009). Novel mathematical models for cold-rolling process. In Flatrolled Steel Processes: Advanced Technologies. CRC Press, 179-191.10.1201/9781420072938-c16Search in Google Scholar

[2] Bidulská, J., Kvačkaj, T., Bodák, V., Bidulský, R. (2007). The microgeometry parameters of uncoated and zinc-coated cold rolled steel strips. Journal of Metals, Materials and Minerals, 17 (2), 1-7.Search in Google Scholar

[3] Pittner, J., Simaan, A.M. (2011). Tandem Cold Metal Rolling Mill Control: Using Practical Advanced Methods. Springer.Search in Google Scholar

[4] Szarková, V., Valíček, J., Vlado, M., Harničárová, M., Rokosz, K., Lupták, M., Samardžić, I., Kozak, D., Hloch, S. (2013). Influence of longitudinal cold rolling on the surface topography of low carbon structural steel. Technical Gazette, 20 (4), 705-709.Search in Google Scholar

[5] Valíček, J., Müllerová, J., Szarková, V., Rokosz, K., Łukianowicz, C., Kozak, D., Koštial, P., Harničárová, M. (2013). A new procedure for the determination of the main technology parameters of rolling mills. In Design and Analysis of Materials and Engineering Structures. Springer, 15-25.10.1007/978-3-642-32295-2_2Search in Google Scholar

[6] Valíček, J., Držík, M., Hryniewicz, T., Harničárová, M., Rokosz, K., Kušnerová, M., Barčová, K., Bražina, D. (2012). Non-contact method for surface roughness measurement after machining. Measurement Science Review, 12 (5), 184-188.10.2478/v10048-012-0028-3Search in Google Scholar

[7] Whitehouse, J.D. (2003). Handbook of Surface and Nanometrology, 2nd Edition. CRC Press.Search in Google Scholar

[8] Oduguwa, V., Roy, R. (2006). A review of rolling system design optimisation. International Journal of Machine Tools and Manufacture, 46 (7-8), 912-928.10.1016/j.ijmachtools.2005.07.023Search in Google Scholar

[9] Kušnerová, M., Valíček, J., Harničárová, M., Hryniewicz, T., Rokosz, K., Palková, Z., Václavík, V., Řepka, M., Bendová, M. (2013). A proposal for simplifying the method of evaluation of uncertainties in measurement results. Measurement Science Review, 13 (1), 1-6.10.2478/msr-2013-0007Search in Google Scholar

[10] Kvačkaj, T., Mamuzić, I. (2006). Development of bake hardening effect by plastic deformation and annealing conditions. Metalurgija, 45 (1), 51-55.Search in Google Scholar

[11] Spišák, E., Slota, J., Majerníková, J., Kaščák, Ľ., Malega, P. (2012). Inhomogeneous plastic deformation of tinplates under uniaxial stress state. Chemicke listy, 106 (Symposia), 537-540.Search in Google Scholar

[12] Vlado, M., Bidulský, R., Gulová, L., Machová, K., Bidulská, J., Valíček, J., Sas, J. (2011). The production of cracks evolution in continuously cast steel slab. High Temperature Materials and Processes, 30 (1-2), 105-111.10.1515/htmp.2011.014Search in Google Scholar

[13] Lenard, G.J. (2007). Primer on Flat Rolling, 1st Edition. Elsevier. Search in Google Scholar

Recommended articles from Trend MD

Plan your remote conference with Sciendo