Pin on disk against ball on disk for the evaluation of wear improvement on cryo-treated metal cutting shears

Abstract

Abstract. When talking about trybology, the election of the laboratory experiment type is a common problem of discussion. Laboratory wear methods are not designed to exactly reproduce the real working conditions of the analyzed part itself but serve to engineers and researcher to extrapolate the laboratory results to the real application. In order to shed some light on this issue, two wear tests have been analyzed following an ASTM standard and using the same experimental parameters and testing pair-materials in order to be able to make a comparison: Pin-on-Disk (PoD) against Ball-on-Disk (BoD). Three different tool steel have been analyzed in this study, AISI D2, AISI A8 and AISI H13, used to produce metal cutting shears. Metal on metal dry sliding tests were designed in order to reproduce the tool working conditions. These three materials were cryogenically treated and compared against no cryogenically treated ones to measure the improvement on their wear resistance due to cryogenic treatment. Finally, the wear rates obtained with both laboratory tests were compared against some real production metal cutting tools wear data. Results revealed an improvement of the wear resistance for cryo-treated samples of around 20% with the BoD test and around 6% with the PoD test. Real production tools wear was calculated for one of the tool steels and for two different applications. The improvement was approximately the one revealed by the BoD test. So, for the studied case, the BoD laboratory test gives more realistic prediction of real tool life improvement due to the cryogenic treatment.

Assessment of Tribological behavior of nickel-nano Si3N4 composite coatings fabricated by pulsed electroplating process

“…In pin-on-disk method, a pin is rotated with a fixed normal load on the surface which results in a circular band and the coefficient of friction is the output of the machine. However, by analyzing the samples; track width and weight loss can also be achieved, which help in analyzing the wear behavior of coatings [25]. All tests were performed at least three times in which the ball was replaced after each test.…”

Severe-to-mild wear transition during running-in of different steel-on-steel tribosystems in ball-on-disc dry sliding reciprocating tests.

“…The selection of the appropriate type of experiment is commonly a matter of discussion (JIMBERT et. al., 2015 (ZUM GAHR, 1987;TYLCZAK et.…”