摘要:
The invention provides a boots for a resin constant velocity universal joint in which a different thickness portion is integrally formed in an inner diameter of a large diameter side end portion of a primarily molded resin bellows in accordance with a secondary molding. A resin bellows (8) constituted by a bellows portion (55), and a small diameter side end portion (40) and a large diameter side end portion (41) which are provided in both end sides of the bellows portion (55) is molded in accordance with a primary molding, and a different thickness portion (56) corresponding to a secondarily molded product is integrally formed in an inner periphery of the large diameter aide end portion (41) of the primarily molded resin bellows (8) by being secondarily molded within an injection metal mold (64). At this time, a molten material of the different thickness portion (56) is injected into a secondary molding space from an optional position of a thin portion.
摘要:
A hollow article is manufactured to have a configuration in which the wall thickness of each of both end portions changes multidirectionally with extremely high accuracy. A device for first pushing a thermoplastic resin into a cavity (9) of a neck mold (6) in contact with an annular orifice nozzle (30) for plastic, and then manufacturing a tubular parison 18a having various different cross sections throughout the whole length with moving the neck mold apart from the annular orifice nozzle, a controller for a drive unit for moving the neck mold onto/apart, provided so as to be operable while the neck mold (6) is moving apart from the annular orifice nozzle (30), and a controller for a drive unit for changing an outlet gap (3) of the annular orifice nozzle, and means for increasing the speed from zero while the neck mold is moving apart from the annular orifice nozzle, are provided, a nozzle mouthpiece constituting the annular orifice nozzle (30) is multi-divided vertically and laterally, the divided part is disposed so as to be able to reciprocate laterally, a part (2a) of the upper portion of the nozzle mouthpiece is replaced with a blow mold 11, and further a part lower than it holds the filling-up thermoplastic resin upon blowing and is released when a product is taken out.
摘要:
A hollow article is manufactured to have a configuration in which the wall thickness of each of both end portions changes multidirectionally with extremely high accuracy. A device for first pushing a thermoplastic resin into a cavity (9) of a neck mold (6) in contact with an annular orifice nozzle (30) for plastic, and then manufacturing a tubular parison 18a having various different cross sections throughout the whole length with moving the neck mold apart from the annular orifice nozzle, a controller for a drive unit for moving the neck mold onto/apart, provided so as to be operable while the neck mold (6) is moving apart from the annular orifice nozzle (30), and a controller for a drive unit for changing an outlet gap (3) of the annular orifice nozzle, and means for increasing the speed from zero while the neck mold is moving apart from the annular orifice nozzle, are provided, a nozzle mouthpiece constituting the annular orifice nozzle (30) is multi-divided vertically and laterally, the divided part is disposed so as to be able to reciprocate laterally, a part (2a) of the upper portion of the nozzle mouthpiece is replaced with a blow mold 11, and further a part lower than it holds the filling-up thermoplastic resin upon blowing and is released when a product is taken out.