Barrel apparatus for barrel plating

Abstract

Plating of a barrel open at both ends where a workpiece arranged inside the barrel is immersed in plating liquid, power is supplied between a negative electrode inside the barrel and a positive electrode arranged in the plating liquid, and the barrel is rotated about the axis while electroplating is performed, wherein if the rotation of the barrel is counterclockwise viewed at the rear end, the internal positive electrode is arranged above and to the left of the workpiece w for deposition that is below and to the right thereof, or if the rotation is clockwise, the electrode is arranged above and to the right of the workpiece for deposition that is below and to the left thereof.

1 . A barrel apparatus for barrel electroplating comprising a barrel having openings at both ends adapted to accommodate a workpiece inside and to be immersed in a plating liquid, a negative electrode arranged inside the barrel adapted to be supplied with power, wherein the barrel is adapted to be rotated around a center axis,
 wherein, an internal positive electrode   is arranged inside the barrel at an upper left portion of the barrel and at a position apart from the workpiece and opposite to the workpiece that is deposited inside the barrel at the lower right portion, when the barrel is seen from the rear portion and when the barrel rotates in a counter-clockwise direction or   is arranged inside the barrel at an upper right portion of the barrel and at a position apart from the workpiece and opposite the workpiece that is deposited inside the barrel at the lower left portion, when the barrel is seen from the rear portion and when the barrel rotates in a clockwise direction.   
     
     
         2 . The barrel apparatus for barrel plating according to  claim 1 , wherein the internal positive electrode is formed of a plurality of plate-shaped electrode plates, and has a structure in which each of the electrode plates is bent and the plurality of the electrode plates are arranged in a laminated structure with intervals between them. 
     
     
         3 . The barrel apparatus for barrel plating according to  claim 1 , further comprising a positive electrode arranged in the plating liquid outside the barrel as a main positive electrode and the internal positive electrode arranged inside the barrel is an auxiliary positive electrode.