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Design and function of CVC rolls as a flatness actuator in a cold rolling mill
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2012 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesisAlternative title
Design och funktion av CVC-valsar som planhetsställdon i ett kallvalsverk (Swedish)
Abstract [en]

When cold rolling thin steel strips with high tensile strength, reversible cluster mills are used. The customer’s demands are high on the products flatness, which is controlled by the different flatness actuators that the mill is equipped with. The objective of this thesis was to find an optimal CVC shape on the shifting inner second intermediate roll in the 20-high cluster mill KV96 at Sandvik Materials Technology in Sandviken. The project consisted of a theoretical calculation of the roll shape that can give the desired change of the strips flatness and practical development and testing of these rolls in the mill.

The results showed that the flatness of the strips can be altered with up to 30 I-units at the edges and 20 I-units in the center with the use of an inner second intermediate roll of the CVC type as this study has concluded.

In this work, three CVC shapes was developed using the calculation software Cluster. The rolls was then ground and verified in the mill.

Abstract [sv]

Vid kallvalsning av tunna band med hög hållfasthet används reversibla mångvalsarsverk. Kundkraven är höga på produkternas planhet, vilken styrs av de planhetsställdon verket är utrustat med. Målsättningen med detta examensarbete var att finna en optimal CVC-form på den förskjutningsbara inre mellanvalsen i 20-valsarsverket KV96 vid Sandvik Materials Technology AB i Sandviken. Projektet har bestått av att teoretiskt beräkna den valsform som kan ge den önskade förändringen i planhetsmätarbilden samt att praktiskt ta fram och prova dessa valsar i verket.

Resultaten visar att man kan påverka planheten på banden med upp till 30 I-enheter i kanten och 20 I-enheter i mitten med användandet av en inre mellanvals av CVC-typ som denna studie kommit fram till.

I det här arbetet utvecklades, med hjälp av beräkningsprogrammet Cluster, tre CVC-valsgeometrier som sedan slipades fram och verifierades i valsverket.

Place, publisher, year, edition, pages
2012.
Keyword [en]
Flatness, actuators, CVC, cluster mill, Cold rolling, strip
Keyword [sv]
Planhet, ställdon, CVC, mångvalsarsverk, kallvalsning, band
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-94031OAI: oai:DiVA.org:kth-94031DiVA: diva2:525175
Subject / course
Materials Design and Engineering
Educational program
Master of Science in Engineering - Materials Design and Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-10 Created: 2012-05-07 Last updated: 2012-08-10Bibliographically approved

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CiteExportLink to record
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Citation style
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