Method for keying metal surfaces

摘要

The method involves forming uniform grooves (7) in a metal surface, where ridges (8) are arranged between adjacent grooves. The ridges are plastically deformed to form undercuts in the grooves, where the degree of plastic deformation of the ridges varies regularly in a longitudinal direction of the grooves. The grooves regularly do not have any undercuts in the longitudinal direction. The plastic deformation forms flutes or knurls or local indentations on top faces of the ridges, and forms local transverse deformations of the ridges transversely with respect to the direction of the grooves. An independent claim is also included for an internal combustion engine cylinder block comprising a cylinder bore with an internal grooved surface.