Barrel apparatus for barrel plating

Abstract

A barrel apparatus for barrel plating in which a non-open type barrel is used, a workpiece is accommodated in the barrel and is immersed in a plating liquid, a negative electrode that is arranged within the barrel and a positive electrode that is arranged in the plating liquid are electrically connected and electroplating is performed while the barrel is rotated about a center shaft, includes a negative electrode arranged at a position that is in contact with a workpiece W inside the barrel, and a positive electrode is arranged at a position that is not in contact with the workpiece inside the barrel, wherein the barrel has a form that is substantially a cylinder or substantially a polygonal cylinder and a ratio between the diameter and the length thereof is in a range of 1:0.7 to 1:1.

1 . A barrel apparatus for barrel plating in which a non-open barrel is used, a workpiece is accommodated in the barrel and immersed in a plating liquid, a negative electrode that is arranged inside the barrel and a positive electrode that is arranged in the plating liquid are electrically connected and electroplating is performed while the barrel is rotated about a center shaft, the apparatus comprising:
 a negative electrode arranged at a position that capable of being in contact with the workpiece accommodated inside the barrel; and   a positive electrode arranged at a position that is not in contact with the workpiece accommodated inside the barrel,   wherein the barrel has a form that is substantially a cylinder or substantially a polygonal cylinder and a ratio of a diameter and a length thereof is in a range of 1:0.7 to 1:1.   
     
     
         2 . The barrel apparatus for barrel plating according to  claim 1 , wherein the positive electrode comprises an auxiliary positive electrode arranged inside the barrel at a position that is not in contact with the workpiece and/or a main positive electrode arranged outside the barrel inside a plating tank where plating liquid is filled so that the main positive electrode is substantially along the periphery of the barrel. 
     
     
         3 . The barrel apparatus for barrel plating according to  claim 1 , wherein the barrel main body has a plurality of barrel holes at the peripheral side surface, the barrel hole has long hole shape so as to facilitate inflow and outflow of chemicals, and the direction of the long holes is inclined with respect to the rotation direction.