Simulation of cutting tool wear by a modified pin-on-disc test

New tribometer designed for the characterisation of the friction properties at the tool/chip/workpiece interfaces in machining

“…Olsson et al 8 proposed another confi guration (Figure 3(c)), in which a pin is placed just after a cutting tool during the machining of a tube's fl at face. In this case, the pin rubs on a refreshed surface.…”

Identification of a friction model for the bearing channel of hot aluminium extrusion dies by using ball-on-disc tests

“…Therefore, in order to reproduce the friction conditions in the bearing channel, it is vital to choose a friction testing technique being able to remove the surface oxides. Short sliding distance ball-ondisc test is one of the best friction testing techniques over the other ones, because during the ball-on-disc tests, severe plastic deformation occurs at the ball / disc interface [14,15,18], especially during the run-in period. Therefore, it is highly suitable for the study of friction between fresh metals, which emulates the contact condition in the bearing channel or welding chamber of the extrusion dies.…”

“…As such, tribological test is probably a sensible technique to reveal the mechanisms of friction under hot aluminium extrusion conditions. Tribological tests (pin/ball-on-disc tests) have been employed previously to identify the friction coefficients for metal cutting process [14][15][16][17]. Recently, the first attempt has been made to simulate the interactions at bearing surface by using ball/pin-on-disc tests [18].…”

“…stress transmitting pins [13] have been used to measure the pressure distribution on the die face during hot aluminium extrusion. Extrusion friction tests for extrudate/bearing interface [4,14,15] was used to characterize friction in the bearing channel of extrusion dies, in which a transition from full sticking to sliding was experimentally observed and the friction coefficients were therefore determined from the lengths of sticking and sliding zones [14][15][16].…”

The Impact of Coating Layers and Additives on the Performance of Carbide Tools when Machining INCONEL 718 Superalloy

“…It is still a research goal to create the extremely difficult conditions of cutting by means of any other type of controlled laboratory tests. Modified wear tests [8,91, chemical wear studies with s-tatic diffusion tests [5,10,111, and high temperature mechanical testing are examples of this approach. Among the mechanical tests, hot hardness is commonly considered to be the best method to simulate the effect on the tool surface during cutting [12-151. In the absence of seizure conditions, or when seizure is broken, the contact between the metal and the tool is through microasperities which impose similar stress fields as those of the indenter in the hot hardness tests [16,171.…”