METHOD OF MOLDING LOCAL PART BY LOW PRESSURIZATION AND RESIN-INJECTION MOLDED GEAR

WIPO Patent Application WO/2006/030810

A1

A method of molding a local part by low pressurization capable of accurately molding a resin-injection molded gear at a low pressurizing pressure by using a standard type molding machine having an eject pin compressing mechanism and taking out a large number of resin-injection molded gears at a time. The resin-injection molded gear (10) formed of a cylindrically formed rim (11), teeth (13) formed on the outer peripheral surface of the rim (11) outward from the center axis (12) of the cylinder thereof, a web (15) joined to the inner peripheral surface of the rim (11) and extending from the inner peripheral surface to the center axis (12) in a flat disk shape, and bosses (16) joined to the web (15) and formed at the center part of the center axis (12) is integrally injection-molded by a resin. The pressurization of the web (15) is started at a pressurization start time T1 which is 300 to 400% of a time T4 between a time when filling is started and a time when gate seal is completed according to a filling start standard by using a pressurizing pressure P of 5 to 45 Mpa, and the pressurization time T is held within the pressurizing pressure for a time of 120 to 150% of the time T4.

JPH09277326

METHOD AND EQUIPMENT FOR INJECTION MOLDING

BESSHO MINORU (JP)
MOCHIZUKI AKIHIRO (JP)

PCT/JP2005/016908

March 23, 2006

September 14, 2005

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POLYPLASTICS CO (JP)
BESSHO MINORU (JP)
MOCHIZUKI AKIHIRO (JP)

B29C45/46; F16H55/06; F16H55/17; B29K59/00; B29L15/00

JP2002235835A	2002-08-23
JP2002200661A	2002-07-16

Furuya, Satoshi (2-17-8 Nihonbashi-Hamach, Chuo-ku Tokyo 07, JP)

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