Estimation of the friction coefficient in turning process of metals through model experiment

Abstract

An in-procedure tribometer is analyzed to assess the friction during orthogonal turning process at cutting rates of up to 300 m/min to determine genuine cutting procedure conditions. The examined tribometer consists of a spring preloaded tungsten carbide with (5% to 8%) cobalt pin with the rounded tip mounted behind the bleeding edge and in contact with the naturally produced workpiece plane. The pin preload is fitted by feed power or force. A 3D-feed force measuring gadget in the obsession of the pin facilitates the assessment of the friction coefficient from tangential and typical strengths. Tests indicate considerably diverse results while reaching new and oxidized planes as well as diminishing friction coefficients as the cutting velocity increases. In general, greater graphite content decreases the friction coefficient and the temperature inclines in the wear pin. A uniform scattering of graphite particles in steel composites enhance their irritating resistance. Moreover, the wear rates for these amalgams are lower than those for similar combinations without graphite. Plane or surface equality is the key predictor of roughness. Plane inequality decreases as cutting speed increases and vice versa.

Keywords

Friction coefficient velocity cutting rate graphite roughness

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