Roughness transfer and wear in last stand of cold rolling mill

Directorate-General For Research And Innovation European Commission

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• Sciences et techniques

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• Publié par: DIRECTORATE-GENERAL-FOR-RESEARCH-AND-INNOVATION-EUROPEAN-COMMISSION
• Nombre de lectures: 40
• Langue: English
• Poids de l'ouvrage: 4 Mo

Extrait

EURO PEAN
COMMISSION
SCIENCE
RESEARCH
DEVELOPMENT
technical steel research
Mechanical working (rolling)
Roughness transfer
and wear in last stand
of cold rolling mill
hi
Report
EUR 18524 EN
STEEL RESEARCH EUROPEAN COMMISSION
Edith CRESSON, Member of the Commission
responsible for research, innovation, education, training and youth
DG XII/C.2 — RTD —Actions: Industrial and materials technologies
Materials and steel
Contact: Mr H. J.-L. Martin
Address: European Commission, rue de la Loi 200 (MO 75 1/10),
B-1049 Bruxelles — Tel. [phone]; fax [phone] European Commission
echnical steel research
Mechanical working (rolling)
Roughness transfer and wear
in last stand of cold rolling mill
J. J. Bertrandie, M. Torniceli!
IRSID
BP 30320
F-57283 Maizières-lès-Metz Cedex
Contract No 7210-EA/326
1 July 1992 to 30 June 1995
Final report
Directorate-General
Science, Research and Development
1998 EUR 18524 EN LEGAL NOTICE
Neither the European Commission nor any person acting on behalf of the Commission
is responsible for the use which might be made of the following information.
A great deal of additional information on the European Union is available on the Internet.
It can be accessed through the Europa server (http://europa.eu.int).
Cataloguing data can be found at the end of this publication.
Luxembourg: Office for Official Publications of the European Communities, 1998
ISBN 92-828-4852-3
© European Communities, 1998
Reproduction is authorised provided the source is acknowledged.
Printed in Luxembourg
PRINTED ON WHITE CHLORINE-FREE PAPER CONTENTS
g
1 - Introduction
2 - Trials achieved on pilot mill and their slitting in different trial plans
3 - Roughness measurement on rolls from pilot mill trials * *■
4 - Discussion on SEM observations of sheetfrompilotmilltrials*2
5 - Detailed analysis of the 4 main trial plansonpilotmill13
6 - Detailed synthesis of the 4 main trial plans onpilotmill18
7 - Global analysis of the 4 secondary trial plans on pilot mill 22
8 - Physical interpretation of observed phenomenaonpilotmill23
9 - Analysis of the trials on an industrial tandem mill27
10 - Roughness transfer control 30
11 - Conclusion33
FiguresandTables37
Annex 1:Roughnessmeasurement conditions and parameters definition69
Annex 2 : Tablesofresultsonsheet from pilot mill trials 72
Annex 3 : SEM pictures of sheet samples frompilotmill76
Annex 4 : Tables of statistical analysis resultsofmaintrialplans1to 4 on pilot
mill — relative variations 85
Annex 5 : Tables ofstatisticalanalysisresults of main trial plans 1 to4onpilot
mill — absolutevalues203
Annex 6 : Figures ofstatisticalanalysisresults of secondary trial plans5to8on
pilot mill127
Annex 7 : Tables ofresultsofthetrialonindustrial tandem mill 137
Annex 8 : Bibliography 139LIST OF FIGURES AND TABLES
Table 1: Slitting of pilot mill trials into complete trial plans
Table 2: Roughness measurements on rolls from pilot mill trials
Figure 3: SEM pictures of sheet with capacitive EDT+ (=stressed running-in rolls
(magnification 100)
Figure 4: SEM pictures of sheet with capacitive EDT+ (=stressed running-in rolls
(magnification 350)
Figure 5: SEM pictures of sheet with various textured rolls (magnification 100)
Figure 6: SEM pictures of sheet with various textured rollsn 350)
Table 7: Relative effect on sheet Ra, according to crossed levels of rolling
parameters, found in trial plan 1
Table 8: Relative effect on roughness transfer, according to crossed levels of rolling
parameters, found in trial plan 1
Table 9: Relative effect on sheet Sk, according to crossed levels of rolling
parameters, found in trial plan 1
Table 10: Relative effect on sheet Ρο±0μπι, according to crossed levels of rolling
parameters, found in trial plan 1
Table 11: Relative effect on sheet Ρο±0,625μπι, according to crossed levels of rolling
parameters, found in trial plan 1
Table 12: Relative effect on elongation, according to crossed levels of rolling
parameters, found in trial plan 1
Table 13: Relative effect on various sheet roughness parameters, of the lubrication
crossed with other rolling parameters, found in trial plan 2
Table 14: Relative effect on various sheet roughness parameters, of the capacitive
EDT to capacitive EDT+ rolls change, crossed with other rolling
parameters found in trial plan 3
Table 15: Relative effect on various sheet roughness parameters, of the roll steel
grade crossed with other rolling parameters, found in trial plan 4
Figure 16: Typical roughness transfer vs rolling force curves found in trial plans 5 to 8
Figure 17: Typical Sk on sheet vs rolling force curves found in trial plans 5 to 8
Figure 18: Peak counts evolution on sheet vs rolling force found in trial plans 5 to 8
Figure 19: Exponentialn of the elongation vs rolling force found in trial plans
5 to 8 Figure 20: Exponential evolution of the elongation vs different parameters found in
trial plans 5 to 8
Figure 21: Effect of lubrication on roughness transfer and sheet Sk found in trial plans
6&8
Figure 22: Effect of lubrication on peak counts and elongation found in trial plans 6 &
8
Figure 23: Effect of different tensions on various roughness parameters found in trial
plan 8
Figure 24: Interaction between rolling force and roll wear in pilot mill trial plans
Figure 25: SEM pictures of sheet of industrial mill trials (magnification 100)
Figure 26: SEM pictures of sheet ofl mill trialsn 350)
Figure 27: Roll roughness evolution with rolled strip length on an industrial rolling
mill
Figure 28: Roughness parameters vs force, for different thickness and roll wear on an
industrial mill
Figure 29: Comparison between roughness parameters vs force curves on an industrial
mill and on pilot mill
Figure 30: Abacus resulting from specific trials
Figure 31: Using the abacus KEYWORDS
tandem
cold rolling mill
roughness
Ra
roughness transfer
skewness
Sk
peak count
Pc
elongation
surface morphology
rolling force
force
wear
tension
lubrication
roll
high chromium
urcromac
texturing
shot blasting
EDT
pilot mill
statgraphics