Aluminum extrusion technology by Pradip Saha PDF
By Pradip Saha
Presents a complete 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 two decades. DLC: Aluminum--Extrusion.
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Extra info for Aluminum extrusion technology
Principle and Benefits of Isothermal Extrusion. The principle of isothermal extrusion as shown in Fig. 12 is to get constant extrusion temperature for a set of input variables, including billet length, initial billet temperature, extrusion ratio, and ram speed. The benefits of isothermal process in direct extrusion are quite significant: • • • • • Improved dimensional stability Uniform surface quality Improved or consistent mechanical properties with uniform microstructure Faster extrusion speed to increase productivity Better air venting through the container, reduced breakthrough pressure, and so on Several methods of isothermal extrusion have been mentioned according to the published research in the previous section.
Because it becomes difficult to measure the surface temperature accurately on the moving extruded material, it was decided to measure the temperature at the end of the stroke where the temperature was found to have a maximum value. The thermometer needed 3 to 4 s to reach the steady values. Table 1 Extrusion parameters Parameter Value Billet Diameter, in. (mm) Length, in. (mm) Temperature (steady), °F (°C) Front Middle Back 6 (152) 19–21 (482–533) 860 (460) 801 (427) 759 (404) Container Bore, in.
Their research showed that these isothermal speed curves not only produce constant exit temperature but result in reduced extrusion time and, therefore, improved productivity. Kialka (Ref 30) developed a method of isothermal extrusion employing a force-speed feedback system to control the extrusion process. The method is characterized by a variable with programmable extrusion speed and real-time process adaptable to the variable conditions of the heat transfer providing the required exit temperature.
Aluminum extrusion technology by Pradip Saha