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INJECTION MOLDING METHOD OF THROTTLE BODY MADE OF RESIN, INJECTION MOLD OF THROTTLE BODY MADE OF RESIN AND THROTTLE BODY MADE OF RESIN
INJECTION MOLDING METHOD OF THROTTLE BODY MADE OF RESIN, INJECTION MOLD OF THROTTLE BODY MADE OF RESIN AND THROTTLE BODY MADE OF RESIN
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机译:树脂制节流阀体的注射成型方法,树脂制节流阀体的注射成型和树脂制节流阀体
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摘要
PROBLEM TO BE SOLVED: To provide a molding method of a throttle body enhanced in roundness and excellent in mechanical strength by the injection molding of a thermoplastic resin, a mold for the throttle body and the throttle body.;SOLUTION: In a mold cavity 10 for molding the throttle body 1 having an attaching flange 5 formed to one end of its cylindrical bore part 2, a pressure fluid injection port 6 is provided to the outside of the bore part 2 in which a throttle valve is incorporated and, after the cavity 10 is filled with a resin, a pressure fluid such as an inert gas or the like is injected from the pressure fluid injection port 6 at pressure drop timing in the cavity to apply pressure to the outside region of the bore part 2 in which the throttle valve is positioned. Next, dwelling pressure is applied to a resin, the resin is cooled while applying the pressurizing hydraulic pressure even after the stop of dwelling pressure and a mold is opened after the resin is solidified to eject a molded product. As a result, the roundness of the throttle body can be enhanced to the utmost in the inner diameter part 3 of the bore part 2.;COPYRIGHT: (C)2009,JPO&INPIT
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