Method and apparatus for electro-chemical machining, for example polishing, a surface of an article.

摘要

A method of electro-chemical polishing the bearing surfaces (5') of bearing rings (5) comprises providing an electrode (20) having a counter surface adapted to the bearing surface, supplying an electrolyte in a gap which is formed between the bearing surface and the counter surface of the electrode, and producing an electric current flowing from the electrode through the electrolyte to the bearing surface of the bearing ring to be polished, in order to establish an electrolysis for removing material from the bearing surface of the bearing ring to be polished. According to the invention the electrode and the bearing ring are rotated with respect to each other in order to be moved along each other in a direction parallel to the surface of the bearing ring to be polished. The electrode has in the case of a bearing surface of a ball bearing a circular section perpendicular to the direction of movement and only covers a part of the circumference of the bearing surface. The invention also includes an apparatus for carrying out this method. <IMAGE>