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Theoretical and experimental investigation of cold hobbing processes in cases of cone-like punch manufacturing
Milutinović, Mladomir ; Movrin, Dejan ; Pepelnjak, Tomaž
Optimal tool making is of great importance for reducing costs and increasing the performance of toolsets. The dies and punches, which are basic components of any metal forming toolset, are usually ...produced by machining, but this technology requires relatively long manufacturing times, characterized by significant material and energy waste. By replacing machining operations or combining them with forming ones, such as cold hobbing (indenting), significant cost and time savings, as well as improvement of tool performance could be achieved. Cold hobbing could be applied to making die cavities as well as shaping punch profiles. Investigations showed that a large number of variables influence the successful application of this technique. However, there is a scarcity of literature regarding the choice of relevant process parameters for the hobbing process. With this in mind, the aim of this paper is to yield further insight into the hobbing process. Special focus will be placed on the influence of the hob geometry on the deformation process and relevant process parameters. This paper presents theoretical, numerical, and experimental investigations of a cold hobbing process in which a cone-like punch is obtained. The upper-bound method was used for metal flow analysis andoptimization of hob geometry. Stress-strain distribution, workpiece geometry prediction, and load estimation were obtained with the finite elementmethod (FEM) using Simufact. Forming 8.1 software. The results were analyzed, compared, and discussed.
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