An Analysis Regarding the Variation of Necessary Force by the Indirect Extrusion Processes ?

In comparison with other working procedures of hollow parts, indirect extrusion is characterized by high precision and productivity. Efficiency of the process imposed intense theoretical and experimental research over the years, resulting in widening the range of products manufactured [2,4–6,16]. To exploit these advantages, it is necessary to continue studying the issues arising from this process. Thus, the flow of the material can be unsatisfactory due to the strong friction arising between it and the working parts of the die, friction caused by the breakdown of the lubricant film at high pressure and temperature conditions existing during processing. Also, the forces and pressures that occur at high indirect extrusion worse than energy parameters of the process and considerably reduces tooling durability [1,3,8,9,17].This paper presents an analysis of the indirect extrusion force needed depending on the size of the workpiece, friction conditions and proposes solutions to optimize energy consumption in the process of processing.