Flattening of narrow and thin stainless steel strips

• Autorzy: Przondziono J.
• Języki publikacji: PL

Abstrakty

EN

Purpose: The purpose of this paper is to evaluate the influence of technological parameters of flattening in the ball rolling mill on spread and geometrical properties of strips made of stainless steel of 1.4310 type and to obtain mathematical models of flattening process. Design/methodology/approach: Flattening was performed in ball rolling mill in which cylindrical rollers have been replaced with balls of ~ 15mm diameter. Due to small dimensions to be measured we suggested the method of vector measurement of digital image. In order to evaluate the influence of technological parameters of flattening process, experimental planning method was used. The adoption of fractional experiment plan of 35-1 type enabled to reduce the number of experiments to 81, despite 5 variables. Findings: The results of performed tests have shown that strip spread is dependent on ball roughness, used draft, relation of wire diameter to ball diameter, back tension stress. The influence of tension stress has not been proved. Strip flatness depends on used draft. Observations have proved good quality of strip edges. No fractures have been detected, even in the case of flattening by means of big draft. Strip surface was of good quality. Research limitations/implications: Test results we have obtained indicate usefulness of research method that has been used as far as determination of influence of flattening process technological parameters on spread and strip geometrical properties are concerned. It has also been proved that it is purposeful to replace cylindrical rollers with balls in rolling mills. Practical implications: Flattening process mathematical models enable to assess rational procedure of flattening process parameters selection in a ball rolling mill, that determines obtaining of the required geometrical characteristics of strips. The results can be used directly when manufacturing strips for springs made of stainless steel 1.4310. Originality/value: Uniform thickness throughout strip width, parallel flat surfaces, narrow dimension tolerance, good surface quality and naturally rounded side edges make it presumable that flattening method by means of ballshaped tools is likely to become an accepted method of metal strips with required flatness manufacturing.

Słowa kluczowe

PL

obróbka plastyczna; stal nierdzewna

EN

plastic forming; ball rolling mill; stainless steel; experimental planning

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2008
• Tom: Vol. 29, nr 2
• Strony: 121--124
• Opis fizyczny: Bibliogr. 20 poz.

Twórcy

autor

Przondziono J.

• Department of Process Modelling and Medical Engineering Silesian University of Technology, ul.Krasińskiego 8, 40-018 Katowice, Poland,

Bibliografia

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