Possibilities to Measure Contact Friction in Bulk Metal Forming (CROSBI ID 178415)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Plančak, Miroslav ; Car, Zlatan ; Kršulja, Marko ; Vilotić, Dragiša ; Kačmarcik, Igor ; Movrin, Dejan
engleski
Possibilities to Measure Contact Friction in Bulk Metal Forming
Friction occurs in all metal forming operations and, in general, it has a negative impact on process parameters, die life, as well as workpiece quality. In cold metal forming processes high interface pressures between die and material take place. These pressures can be the limiting factor of application of cold forming. By reducing interfacial friction, contact pressures can be reduced too. Knowledge of friction amount (factor of friction μ and/or friction ratio m) is essential for calculation of the main process parameters (load, energy), for choosing a proper lubricant but also for numerical modelling of forming operations. There exist a number of experimental methods to determine friction in metal forming processes. Current paper deals with the possibilities to evaluate friction. It analyses and assesses a number of existing friction models in cold metal operations. Proposal of a new friction model for cold metal forming operations is presented and discussed. Measurement of friction force in backward extrusion for different lubrication conditions was also preformed.
Cold backward extrusion; Experimental tooling; Friction models
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Podaci o izdanju
19 (4)
2012.
727-734
objavljeno
1330-3651
1848-6339
http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=137660
Povezanost rada
Metalurgija, Računarstvo, Strojarstvo