engleski

Experimental and Numerical Determination of Friction Coefficient in Metal Forming Processes

Two approaches are common in friction investigations in metal forming processes. The first one is its calculation of the known expression for deformation force when other parameters are already known and forming force has been measured. The second one is always more accurate but also more time demanding. It is an experimental approach to measure the size of the friction coefficient by using specific experimental methods for different metal forming processes. The result of these two methods - friction coefficient is used as an input parameter in numerical simulations. This paper gives an experimental friction determination using Burgdorfˋs method of rings upsetting, by which the calibration diagrams have been obtained. These diagrams respond to three friction cases: when two different lubricants have been used and when no lubricant has been used. Experimental results and specific points from calibration diagram have been tested using numerical simulation program MSC Marc Mentat for plastic deformation.

Friction coefficient ; Burgdorf's method ; Rings upsetting ; Ring compression test

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