Importance

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Abstract

In a method for integrally forming a protruded shaft in the base of a sealed case for a memory device in which a storage medium is housed, a metal plate for manufacturing the base is placed on a die having a hole with an inside diameter that corresponds to an outside diameter of the protruded shaft, and a portion for forming the protruded shaft in the metal plate is positioned over the hole. The portion for forming the protruded shaft in the metal plate is pressed by a press tool from the side opposite the die, and the material of the portion for forming the protruded shaft is moved into the hole to form a hollow protrusion sealed off at a distal end. The sealed distal end in the protuberance is compression-molded from a direction opposite the press direction of the press tool by a compression tool disposed in the hole, and the protruded shaft is obtained. The protruded shaft with a large effective length that is free of cracks and ruptures can be integrally formed in the base.

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First Claim