Studies on Micro Plastic Working

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Recent developments in the electronics industries requre a piercing techniquefor fine holes at a high production rate. In the present project, it was attempted to apply to such piercing a new manufacturing process using a viscoplastic pressure medium (VM process), recently proposed by the head investigator. Theresults obtained are summarized as follows.1. Investigations into single fine hole piercing:In the first term (in 1986), the VM process was applied to piercing of a single fine hold in order to examine its validity. As a result, the process was shown to be successful in piercing various fine holes through carbon steel and nickel foils, unobtainable by the conventional shearing process: for example, a circular hole of 50 <micrn>m in diameter and a slit of 50 m in width. The piercing pressure was analyzed theoretically.2. Investigations into multipiercing of plural fine holes:In the second term (in 1987), multipiercing of plural fine holes was attempted as a more practical problem, employing the VM process. The appearance of the holes pierced through electronics copper foils was examined microscopically, and the mechanism of the hole formation was clarified. Though under a limited condition, the process was successful in obtaining the circular holes 50 <micrn>m in diameter and 75 (micrn)m in pitch with one shot, impossible by the conventional shearing. Furthermore, a new technique (AFM method) for precise piercing of fine holes was developed.