鼠鋳鉄のころがり軽摩耗―アムスラー式摩耗試験機による研究―

Abstract

In order to study the rolling wear of gray cast iron accompanied by sliding, the mild wear tests were carried out under the dry condition using the upper and lower test pieces of gray cast iron of the same quality. A modified Amsler wear testing machine was used with the load of 3∼60 kg, and at the sliding velocity of 0∼0.27 m/sec combinating the test pieces of various diameters. Results are summarized as follows. (1) The wear process within this experimental limits is understood as the oxidative wear, and the mechanical wear, or mixed, but does not lead to the scuffing. (2) There is a critical point (P=14 kg/mm2) between the wear loss and the stress (maximum Hertz stress), and the wear loss shows a rapid rate of increase beyond it. (3) At the stress higher than 11 kg/mm2, the amount of wear loss of the lower piece is greater than that of the upper one. (4) Chemical analysis of wear particles by means of X-ray diffractometer shows that the amount of Fe2O3 is larger than 50% in weight in the oxidative region, 10∼50% in the transient region and almost zero in the mechanical region.