Patent ID: 6299750
Filing Date: 2001-10-09
Classification: B25B,C23C

Abstract:
Method for coating a plurality of elongated metal blanks, wherein each of the blanks have at least two portions of different cross sections aligned axially one after another, wherein a first of said portions of each of the blanks has indentations and a second of said portions of each of the blanks has exposed surfaces, the method comprising the steps of in a chemical electroplating bath with a dispersion of hard material particles suspended in the bath forming an electroplating medium, electroplating a metallic delimiting layer onto the blanks, with the particles embedding into the delimiting layer and projecting therefrom while rolling the plurality of blanks freely around in a rotating drum in said dispersion such that the hard material particles embedding into the delimiting layer at the exposed surfaces of the blanks are removed by the blanks with the projecting particles rubbing against one another, wherein the exposed surfaces remain substantially free from the particles relative to the particles in the indentations, the indentations being less exposed to the rubbing blanks than said exposed surfaces.