With a system of simulative tribology tests for cold forging the friction stress for aluminum, steel and stainless steel provided with typical lubricants for cold forging has been determined for varying normal pressure, surface expansion, sliding length and tool/work piece interface temperature. The results show, that friction is strongly influenced by normal pressure and tool/work piece interface temperature, whereas the other process parameters investigated show minor influence on friction. Based on the experimental results a mathematical model has been established for friction as a function of normal pressure and tool/work piece interface temperature. The model is verified by process testing measuring friction at varying reductions in cold forward rod extrusion. KEY WORDS: empirical friction model, cold forging, simulative friction tests.
|Title of host publication||Proceed. Euromech 435 FWMF, Friction and wear in metal forming|
|Place of Publication||Valenciennes, France|
|Publication status||Published - 2002|
|Event||Euromech 435 : Friction and Wear in Metal Forming - Valenciennes, France|
Duration: 18 Jun 2002 → 20 Jun 2002
|Period||18/06/2002 → 20/06/2002|