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Download ROMILDA now, click HERE ! It's fully functional and absolutely FREE! No expiration date! If you want to know more, read on. (News about EDGER at the end of this page.)

The formula is illustrated thoroughly in this site (click Roll Pressure and also, from our Home Page, go to Appendix 1 of the Documentation). The following literature is available:

• A. Izzo, Iron and Steel International, Feb. 1974 Vol. 47 No 1 p 47
• A. Izzo, Archiv für das Eisenhüttenwesen, 47 (1976) Nr. 2 Februar
• A. Izzo, La Metallurgia Italiana, n. 4, 1982
• A. Izzo, Iron and Steel International, February 1983 Vol. 56 No 1 p 33
• A. Izzo, Iron and Steel International, June 1983 Vol. 56 No 3 p 104

(Click Publications for full titles.) In the last two papers you will also find an early version of the Basic source code.

A brief note on the philosophy behind the formula. Conventional methods are based on uncertain parameters such as high temperature yield strength and coefficient of friction. Our method, as much as Siebel's, starts from experimental values of roll pressure in "standard" rolling conditions (k'_w). Then, to calculate the actual roll pressure (k_w), 5 parameters are considered – each with a coefficient that multiplies the standard roll pressure. Each coefficient values 1 under standard conditions. (Click as advised above to learn what we mean by standard.)

As an equation we have: k_w = k'_w x a₁ x a₂ x a₃ x a₄ x a₅

where the five coefficients account for

a₁ = effect of relative rolling speed (speed/diameter)
a₂ = Tselikov's "effect of the outer zones" (flat rolling)
a₃ = effect of form factor (b₀/h₀)
a₄ = effect of roll material
a₅ = effect of grade of rolled steel

Note that very few other formulae take so many factors into account.

In 1981 the AIM (Associazione Italiana di Metallurgia) published a book ("Teoria e Pratica della Laminazione") of the lectures of a multi-authored course about hot rolling. Pages 13 to 16 of that book show a number of diagrams comparing our calculated data to experimental data collected by Siebel, SKEFKO, Wusatowski, Wallquist and Leufvén. In these pages comparisons are also made with numerous measurements we made in the Fiat Teksid hot skelp mill. In all cases our formula was demonstrated to be considerably accurate.

As a final note, we can reveal here that ROMILDA has a "secret door" giving access to a configuration page. For example, assume that in this page the maximum value for roll diameter is set to 2000 mm. If you work with 280mm rolls and when requested you enter 2800 instead of 280, an alarm will go off. The key to this door is pressing "c" from the initial menu.

Actually, these are simply out-of-range alarms for the careless typist. The only important, significant parameter you can set through this secret door is the span-to-diameter ratio of the rolls, which will certainly differ from the preset 2.25.

But now it's really worthwhile experimenting with ROMILDA for yourself. Click HERE: it will take you but a few seconds to download a program originally priced at US$380. FREE!

And there is more! You can also download a FREE fully functional copy of EDGER, the ideal complement for ROMILDA in flat rolling: click HERE.