SPARK PLUG INSULATOR PRODUCTION METHOD, INSULATOR, MOLDING DIE
The present invention provides a technique for restraining deformation of a molded body in releasing the molded body from a mold. An employed rear mold is composed of a plurality of mold pieces. The plurality of mold pieces include a first mold piece which forms a first partial internal surface of t...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | The present invention provides a technique for restraining deformation of a molded body in releasing the molded body from a mold. An employed rear mold is composed of a plurality of mold pieces. The plurality of mold pieces include a first mold piece which forms a first partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface, and a second mold piece which is located axially forward of the first mold piece and forms a second partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface. Releasing the molded body includes starting to move the first mold piece rearward in relation to a rear molded portion, and, subsequently to starting to move the first mold piece, starting to move the second mold piece rearward in relation to the rear molded portion, thereby disassembling the rear mold into the plurality of mold pieces. The rear mold may be composed of a plurality of mold pieces which form different portions of the internal surface of the rear mold. |
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