Aluminum extrusion technology by Pradip Saha

By Pradip Saha

Offers a complete advent to the explosion of knowledge that has turn into on hand within the box of aluminum extrusion expertise over the last fifteen or two decades. DLC: Aluminum--Extrusion.

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In the 46 / Aluminum Extrusion Technology case of a continually increasing exit temperature of aluminum alloy extrusion, isothermal extrusion can be carried out in the following ways: • • • Reducing the exit speed during the extrusion according to the measured exit temperature. This requires continuous temperature measurement. Reducing the extrusion speed according to a preselected speed program. On a modern press, the ram displacement can be divided into steps of varying lengths, each with a programmed speed.

The extrusion pressure required to push the metal through the die will be higher due to a higher amount of plastic strain. The normal extrusion ratio range in industry practice for hard alloys is from 10 to 1 to 35 to 1, and for soft alloys, 10 to 1 to 100 to 1. However, these normal limits should not be considered absolute because the actual shape of the extrusion affects the results. Extrusion Temperature. Extrusion is commonly classified as a hot-working process. Hot working is defined as deformation under conditions of temperature and strain-rate such that recovery processes take place simultaneously with deformation.

The temperature profile at a constant speed must first be determined measuring each case in order to decide whether isothermal extrusion is feasible and how the press control system should be modified. In the 46 / Aluminum Extrusion Technology case of a continually increasing exit temperature of aluminum alloy extrusion, isothermal extrusion can be carried out in the following ways: • • • Reducing the exit speed during the extrusion according to the measured exit temperature. This requires continuous temperature measurement.

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