Metallurgy

Aluminum extrusion technology by Pradip Saha

By Pradip Saha

Presents a finished advent to the explosion of data that has develop into on hand within the box of aluminum extrusion know-how over the past fifteen or 20 years. DLC: Aluminum--Extrusion.

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The basic idea of so-called isothermal extrusion developed from the knowledge of the relationship between the exit temperature and the ram speed. The exit speed is varied via the press control system to provide a constant exit temperature. Laue and Stenger provided an overview of isothermal extrusion. The practical and economical value of isothermal extrusion is that, except at the very beginning, it allows the use of the optimum extrusion speed over the complete extrusion cycle. On the other hand, if the exit temperature varies during extrusion by an unknown amount, the press speed is usually adjusted in accordance with the maximum prevailing temperature.

17. The stresses acting on this slab are shown in Fig. 18(b). The equilibrium equation is given by: 2 2 π ( D + dD) + pz πD + pr π D ds sin α 4 4 + τ f πD ds cos α = 0 − ( pz + dpz) (Eq 23) where τf is the frictional stress at the dead-metal zone/flowing material interface, pr is the radial pressure and α is the semidead-metal zone angle. This equation can be simplified by using the following geometric relationship among dz, dD, and ds: ds sin α = dz tan α = ds cosα = dz = dD 2 dD 2 tan α (Eq 24) (Eq 25) From the yield criterion, p r = pz + σ (Eq 26) where pr is the radial pressure, pz is the pressure in the Z direction and σ is the flow stress of the material.

In the next chapter, thermal considerations in aluminum extrusion, including isothermal extrusion, will be discussed in more detail. Extrusion Speed. The response of a metal to extrusion processes can be influenced by the speed of deformation. Increasing the ram speed produces an increase in the extrusion pressure. The temperature developed in extrusion increases with increasing ram speed. This increase is due to the fact that the strain rate is directly proportional to the ram speed, and the magnitude of the generated heat is proportional to the strain rate.

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