FRICTION COEFFICIENT MEASURING METHOD AND MEASURING DEVICE OF METAL MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a friction coefficient measuring method and a device therefor capable of measuring a friction coefficient of a metal member having an extremely small surface area.;SOLUTION: This method has a process 100 for pressing an indenter for measuring a contact surface pressure having a vertical angle of 60° or less and having a constant friction coefficient to a metal material into an object metal material with a prescribed load at a prescribed temperature; a process 110 for measuring an impression projection area in the process 100; a process 120 for calculating the contact surface pressure of the object metal material from the impression projection area in the process 110 and the friction coefficient of the indenter for measuring the contact surface pressure, by using a force balance expression [expression (b):μ={(W/pA)-1}tan(α/2); wherein, μ: the friction coefficient, W: the pressing load, p: the contact surface pressure, A: the projection area of the impression, α: the vertical angle of the indenter]; a process 130 for pressing an indenter for measuring the friction coefficient having the same vertical angle as the indenter for measuring the contact surface pressure, having prescribed yield strength [expression (a): 1.1Yi2.8Yp; wherein, Yi: the yield strength of the indenter for measuring the contact surface pressure, Yp: the yield strength of the object metal material], and having a high friction coefficient in the non-lubricated state, into the object metal material with the same load at the same temperature as in the step 100; a process 140 for measuring an impression projection area in the process 130; and a process 150 for calculating the friction coefficient of the object metal material from an impression projection area in the process 140 and the contact surface pressure in the process 120 by using the expression (b).;COPYRIGHT: (C)2008,JPO&INPIT