Edge profile during initial passes of aluminium slab rolling

Wright, D. S.; Sheppard, T.

doi:10.1179/030716981803275442

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…The comparison of the predicted and the measured spreads for the cases of D8A and AA 3003 are listed in Table 3. The six formulae to be examined here are due to Hill, 1 8 Wusatowski, 3 ,4 Sparling, 2 Helmi and Alexander, 1 Sheppard and Wright, 6 and Raghunathan and Sheppard 5 (see Appendix). Each formula, except Raghunathan and Sheppard' s, gives an acceptable prediction for laboratory rolling (D8A).…”

Section: Calculation Of Spread By Different Formulaementioning

confidence: 99%

Lateral deformation during hot flat rolling of aluminium alloys

Sheppard¹,

Duan²

2002

Materials Science and Technology

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At present, there would appear to be no literature dealing with the prediction of width variation either by analytical or numerical methods during the breakdown passes in the commercial hot rolling of aluminium alloys. Since this lateral ¯ow may promote many rolling defects, particularly edge cracking, this would appear to be an important technical feature. It is clear that an understanding of these factors, which play a dominant role in this deformation mode, should increase yield and ef® ciency. In this communication, initial slabs with concave, convex and straight edge pro® les are simulated by a commercial ® nite element analysis program and results compared with experimental data derived both from laboratory and industrial rolling data. The computed results are in good agreement with the measured data. Some severe discrepancies between laboratory and industrial rolling are highlighted and discussed.MST/5117

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Section: Calculation Of Spread By Different Formulaementioning

confidence: 99%

Lateral deformation during hot flat rolling of aluminium alloys

Sheppard¹,

Duan²

2002

Materials Science and Technology

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“…where α is a viscoplastic friction coefficient, 0 α 1 and K is the consistency of the material, which is defined in equation (2). p is the sensitivity parameter to the sliding velocity.…”

Section: Fem Formulation [8 9]mentioning

confidence: 99%

“…The calculated temperature is only rigorously true under certain conditions. The FDM gives a better prediction than the analytical approach by consideration of heat generation through the slab thickness and applying friction work to the surface elements, in addition to the conduction between roll and slab [2,3]. Three-dimensional FD models are notoriously difficult to handle because remeshing facilities do not exist.…”

Section: Introductionmentioning

confidence: 99%

Prediction of temperature evolution by FEM during multi-pass hot flat rolling of aluminium alloys

Duan¹,

Sheppard²

2001

Modelling Simul. Mater. Sci. Eng.

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In rolling, deformation is applied by a series of passes, which are necessarily separated by holding periods between passes. The formation of the temperature profile therefore has a complex history. Accurate information on the time variation of temperature is essential for predicting microstructural development during hot working conditions and for the design of an acceptable rolling pass schedule. In the present paper, the finite-element method is employed to compute temperature changes under both laboratory and industrial breakdown rolling conditions. The calculated results are then compared with temperature records extracted from the literature. The difference between laboratory and industrial rolling is discussed. By using inverse analysis methods, appropriate heat transfer coefficients can be ascertained.

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“…The rate of deformation (d) at points within the body is defined as the symmetric portion of the velocity gradient (I): (5)…”

Section: Forming Modelmentioning

confidence: 99%