鋳鉄のアブレシブ摩耗の法則性について（Holmの摩耗式との関係）

Abstract

Adhesive wear, which occurs in the rubbing of metals pair, is a very complicated phenomenon, since not only the flow pressure of the material (for metals, this is replaced by the indentation hardness) but also various factors are combined in a complicated way. In this work, the relation between abrasive wear, which had been proved to depend mainly on the hardness, and the Holm’s law of wear was examined by carrying out wear tests of cast iron with emery paper.It appears that the dominating hardness of wear is not at room temperature but at the rubbing surface temperature induced by frictional heating. By expressing the hardness as a function of temperature and the temperature as a function of load and sliding speed, WL=KPeCP1⁄2V⁄Hr could be obtained theoretically from the Holm’s equation, where WL is the wear rate, P the load, V the sliding speed, Hr the hardness at room temperature, C the constant depending on the properties of material and K the constant in the Holm’s equation.For the abrasive wear of cast iron, it was confirmed that the above equation is applicable to a considerably wide range of load and speed. Though K and C cannot be obtained theoretically and accurately at the present time, the wear rate at a given load and speed can be calculated if the two constants are determined by a small number of tests. In the repeated friction, K and C change as a function of sliding distance on account of the loss of abrasive particles on the wear track, so that the wear-distance curve is obtained by integrating the above equation along the distance. The equation did not hold at a high load and speed, at which the temperature of the rubbing surface can be considered to be very high. This cause is deduced that some factors other than the hardness also act predominantly on the wear process.