| 摘要 |
A cold pressing method which comprises the steps of forming sheets to be pressed together into the disc form by a press work device, forming annular projections inside of the annular cold pressing section of the sheets in order to release a stress caused by the deformation of the sheets resulting from the plastic fluidity of their annular junction, superposing the sheets and cold pressing the superposed sheets around the annular cold pressing section with elevated adhesivity.
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