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Sfogliabile_A&L_n4_AGOSTO_2016

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0056-0063 6<br />

The graph in figure 4 summarises the thermal history<br />

of the material, highlighting the process that typically<br />

takes place inside an extrusion plant.<br />

High-efficiency rapid heating<br />

The new rapid heating furnace developed in collaboration<br />

with Danieli Olivotto Ferrè (DFO) has been designed<br />

to achieve maximum energy efficiency thanks to<br />

the recovery of fumes heat in the indirect heating zone,<br />

gained by increasing the convective thermal exchange<br />

via forced ventilation. The compact and modular design<br />

of the equipment privileges easy maintenance, steel<br />

rolls with supports external to the heating chamber allow<br />

the application of motorized rollers to vacate the<br />

furnace with ease at the end of the campaign. Each furnace<br />

module can be easily uncovered guaranteeing full<br />

accesstobilletsandrolls.<br />

Instead of traditional bricks, the refractory is constructedinlightfibre,whichhaslowerthermalinertiaguaranteeing<br />

precision and flexibility in temperature regulation<br />

and allowing to quickly modify the set-up between<br />

different alloys, thus eliminating any risk of overheating<br />

and melting in the furnace.<br />

Thanks to fine-tuning of thermal taper in the furnace exit<br />

area, the BreDANext system guarantees the best results<br />

in terms of quality and press productivity through extrusion<br />

speed regulation in function with the isothermal<br />

ad incrementare la dinamica dello spruzzo d’acqua: questo<br />

fa sì che i raffreddamenti con ugelli a tutta acqua siano limitati<br />

a coefficienti di scambio termico molto elevati che portanoseveredistorsionietensioniresiduenelprofilotrattato,<br />

specie se di geometria complessa.<br />

Laregolazionedellaportatadiacquaediariaavvienedi-<br />

stintamenteperognimodulolongitudinaleconsentedicon-<br />

Figure 6: a) Process parameters in traditional extrusion (billet temperature, extrusion<br />

speed & pressure, temperature at the mouth of the press); b) isothermal extrusion<br />

without conical billet temperature control; c) isothermal extrusion with conical billet<br />

temperature control<br />

Figura 6: a) Parametri di processo nell’estrusione tradizionale (temperatura billetta,<br />

velocità di estrusione, pressione, temperatura alla bocca della pressa); b) estrusione<br />

isoterma senza controllo conico della temperatura della billetta; c) estrusione<br />

isoterma con il controllo conico della temperatura della billetta<br />

August <strong>2016</strong> N° 04<br />

- 61

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