| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal material used for a machine element component and a press molding and having a surface shape allowing a low friction coefficient.SOLUTION: The metal material allowing a low friction coefficient has flat projections having an area larger than that of a true contact portion generated by plastic deformation of the projections of surface projections and depressions of the metal material having a relative slide under a load without plastically deforming a bulk. The metal material having a surface shape allowing a low friction coefficient is manufactured by plastically or mechanically processing, etc., such as rolling and drawing the metal material having the flat projections having an area larger than that of the true contact portion. The area of the flat projections of the metal material is 1.2A or more to an area A of the true contact portion generated by plastic deformation at the initial stage.SELECTED DRAWING: Figure 2 |
