Parameters affecting lateral deformation in slabbing mills

Abstract

The nature of deformation in the roll gap during passes in which plane-strain conditions do not obtain is investigated, and it is shown that plastic flow is complex, involving material transfer from the slab edges to the roll-contact face. The factors affecting spread in the lateral directions are investigated, and it is concluded that the homologous temperature and the dimensionless group (deformed roll radius /initial slab thickness) are important factors. A new spread formula, defining spread as the natural lateral strain, is presented, and is shown to agree well with the experimental work reported. The results of over 400 rolling tests, including some tests on plant mills, are incorporated into the analysis. It is shown that a change from sticking to slipping friction modifies the deformation mode, and that the structure of the cast ingot or slab may also be an important factor influencing deformation in the roll gap.

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References

SIMS

R. B.

: Proc. Inst. Mech. Eng., 1954, 168, 191.

COOK

P. A.

and MCCRUM

A. W.

: ‘The investigation of spread, load and torque in hot flat rolling‘, BISRA Report No.2, March 1958, London.

SPARLING

L. G. M.

: Met. Technol., 1977, 4, 301.

BEESE

J. G.

: J. Iron Steel Inst., 1971, 209, 787.

OROWAN

and PASCOE

K. J.

: ‘First report of the rolling mill research sub-committee‘, 124; 1946, London, The Iron and Steel Institute.

saws

R. B.

and WRIGHT

: J. Iron Steel Inst., 1963, 201, 261.

HELMI

and ALEXANDER

B. W.

: J. Iron Steel Inst., 1968, 206, 1110.

ZIENCEWICZ

O. C.

and GODBOLE

P. M.

: In:. J. Numer. Meth., 1974, 8, 3.

GOKYA

and KIHARA

: J. Jpn Soc. Technol. Plast, 1970, 11, 11.

10.

LAHOTI

G. D.

and KHOBAYASHI

: US Army Report Series 117, No.3, April 1960, US Army Dept, Washington, DC.

11.

GEUZE

: ‘Traite theoretique et practique du laminage du fer et de lacier’; 1900, Paris.

12.

SIEBEL

: Stahl Elsen, 1923, 43, 1295.

13.

TAFEL

and SEDLACZEK

: Stahl Eisen, 1925, 45, 190.

14.

numcs

: Blast Furn. Steel Plant, 1936, 24, 785.

15.

COTEL

: ‘Die Grundlagen des Walzens‘; 1953, Halle, Saale.

16.

WUZATOWSKI

: Iron Steel, 1955, 28, 49.

17.

SPARLING

L. G.

: Proc. Inst. Mech. Eng., 1961, 175, 604.

18.

YANAGIMOTO

: Socei-to-kako (J. Jpn Soc. Technol. Plast.), 1964/65, 5–40, 315.

19.

TsELucov

: ‘Stress and strain in rolling‘, 152; 1967, Moscow, MIR.

20.

BEESE

J. G.

: J. Iron Steel Inst., 1972, 210, 433.

21.

KAPUSTIMA

M. T.

and SERDYUK

L. A.

: Steel USSR, April 1974, 309.

22.

CAZIMOROIUCI

and STANCIU

: Metallurgia (Bucharest), 1975, 27, 349.

23.

DAHL

, WILDSCHUTZ

, and SCHIFGEN

: Arch. Eisenhüttenwes., 1968, 39, 501.

24.

BEESE

J. G.

: J Iron Steel Inst., 1971, 209, 67.

25.

DAHL

, WILDSCHUTZ

, and SCHIFGEN

: Arch. Eisenhattenwes., 1968, 39, 577.

26.

BROOKS

P. J. S.

: ‘Attempt to produce a mathematical model to predict edge profiles of hot rolled ingots using plastiscene‘, Alcan Research and Development Report, BP-ER 48/70, 1970, Banbury Laboratories.

27.

SKELTON

C. R.

: ‘The effect of stock temperature, rolling speed, and stock surface, scale conditions on spread in the rolling of steel bars‘, BISRA Report No.MW/INR/65, 1965, London.

28.

SHEPPARD

and WRIGHT

O. S.

: Met. Technol., 1980, 7, 274.

29.

S. I.

and KHOBAYASHI

: Int. J. Mech. Sci., 1975, 17, 293.

30.

ALEXANDER

J. M.

: Proc. Inst. Mech. Eng., 1955, 169, 1021.

31.

SHEPPARD

and waiGirr

D. s.

: Met. Technol., 1979, 6, 215.

32.

SOO

K. J.

, HOGGART

J. S.

, and WNRRROM

P. W.

: Int. J. Mech. Sc., 1975, 17, 435.

33.

HOFF

and DAHL

M. T.

: ‘Grundlagen das Walzverfahrens‘, 192; 1955, Düsseldorf, Veilag Stahleisen.

34.

moLoNov

G. D.

and SAPELIGN

: Metallurgy, 1976, 5, 28.