| 摘要 |
PURPOSE:To easily form a concave so as to conform reduction quantity to a prescribed quantity with high accuracy by applying hard chrome-plating on only a rough concave with electroplating after the rough concave is formed by excessively grinding with a grinding machine. CONSTITUTION:With the grinding machine with a cam mechanism or numerical control grinding machine and the like, the rough concave 3b' is formed on an intermediate roll 3 by excessively grinding over the reduction quantity (D0 -D1) and reduction width W. After the rough concave 3b' is formed, the diameter D1' of the roll at the minimum reduction position is exactly measured and a half of difference between the reduction quantity (D0 - D1') after grinding the roll and required reduction quantity (D0 - D1), i.e. (D1 - D1') / 2 is known as a necessary thickness for hard plating. Next, hard chrome-plating is performed on only the part of the rough concave 3b' with galvanizing. |
