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Wytwarzanie cienkich taśm ze stali nierdzewnych poprzez płaszczenie w walcarce kulowej

Przondziono J., Grosman F., Szymszal J.

Hutnik, Wiadomości Hutnicze

2009

Vol. 76, nr 1

83-85

W referacie opisano wpływ parametrów procesu płaszczenia w walcarce kulowej na poszerzenie oraz cechy geometryczne taśm wykonanych ze stali odpornej na korozję X2CrNiMo17-12-2 (1.4404). W oparciu o uzyskane eksperymentalnie wyniki opracowano model matematyczny procesu płaszczenia. Do oceny wpływu parametrów technologicznych procesu płaszczenia zastosowano metodę planowania eksperymentu. Przyjęcie frakcyjnego planu eksperymentu typu 35-1 pozwoliło, pomimo 5. zmiennych wejściowych (chropowatość kul, gniot, naprężenie naciągu i przeciwciągu, średnica drutu), na ograniczenie liczby przeprowadzonych prób walcowania do 81. Matematyczny model procesu płaszczenia umożliwia racjonalny dobór parametrów drutu wsadowego i parametrów procesu płaszczenia w walcarce kulowej, pozwalających na uzyskanie wymaganych cech geometrycznych taśm. Wyniki pracy można wykorzystać do projektowania technologii produkcji cienkich taśm wykonanych z odpornej na korozję stali X2CrNiMo17-12-2, która jest stosowana na elementy sprężyste oraz dla celów medycznych.

The paper present influence of flattening process parameters in ball rolling mill on widening and geometrical properties of strips made of stainless steel X2CrNiMo17-12-2 (1.4404). The results obtained in the experiment created the ground for the development of flattening process mathematical model. 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, despite 5 input variables (ball roughness, draft, pull and backpull tension, wire diameter), to reduce the number of experimental rolling to 81. Flattening process mathematical model enables rational selection of charge wire parameters as well as flattening process parameters in a ball rolling mill, that determine obtaining strips with the required geometrical characteristics. The results can be used to design production technology of thin stips made of stainless steel X2CrNiMo17-12-2, that are used for elastic elements and for medical purposes.

Flattening of narrow and thin stainless steel strips

Przondziono J.

Archives of Materials Science and Engineering

2008

Vol. 29, nr 2

121-124

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.