MOLDING METHOD OF SHAFT CYLINDER

PROBLEM TO BE SOLVED: To provide a molding method of a shaft cylinder in which a gate trace on an exterior surface of the shaft cylinder can be perfectly concealed from an eye of a user without constraint of molding die design.SOLUTION: There is provided a method of molding a shaft cylinder by two-c...

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Bibliographische Detailangaben
Hauptverfasser:	SATO JUNJI, SUMITOMO HAJIME
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BUREAU ACCESSORIES IMPLEMENTS FOR WRITING OR DRAWING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WRITING OR DRAWING IMPLEMENTS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a molding method of a shaft cylinder in which a gate trace on an exterior surface of the shaft cylinder can be perfectly concealed from an eye of a user without constraint of molding die design.SOLUTION: There is provided a method of molding a shaft cylinder by two-color molding. The method includes: a first process in which a first component of the shaft cylinder having an open hole at an exterior surface of a core pin is molded by a primary molding in which a molding material is supplied from an outside of the core pin; a second process in which a second component of the shaft cylinder is molded on an exterior surface of the first component by a secondary molding in which a molding material is supplied into an inside of the core pin through an open hole; and a third process in which the core pin is extracted from the first component together with a runner of an inside of the core pin.