PRODUCTION OF BEARING BALL FOR X-RAY TUBE

摘要

PURPOSE:To coat uniformly and securely a solid lubricant on plural balls for a bearing for an X-ray tube by holding the balls in the meshes of a mesh electrode so as not to contact with eachother and plating the lubricating agent thereto while moving the balls. CONSTITUTION:The plural bearing balls 11 made of steel are held in the meshes 21 of the cage-shaped mesh electrode 16 constituted of copper mesh wires 22 and are dipped into a lead plating liquid 15 in a plating bath vessel provided with a lead electrode plate 14 on the inside surface of an outside box 13. The electrode 16 is connected to the negative pole of a DC power source 18 and the plate 14 to the positive pole thereof via a switch 17. Each mesh of the elecrtrode 16 is made into a rectangular or rhombic shape and is so set that the balls 11 held therein dot contact with each other. The balls 11 are subjected to lead plating while the balls are moved by oscillating the electrode 16 in an arrow direction at every prescribed time. The bearing balls for the rotary anode type X-ray tube coated with the lead plating layer as the solid lubricating agent with the substantially high adhesive force to a uniform thickness are thus obtd.