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Patent Searching and Data


Title:
MOLDING METHOD OF PLASTIC CYLINDRICAL MATERIAL AND MOLD THEREFOR
Document Type and Number:
Japanese Patent JPS6327226
Kind Code:
A
Abstract:

PURPOSE: To enable the title method to manufacture a high-precision cylindrical material, by a method wherein a cavity side is swollen out into a molding cavity by raising pressure of a hydraulic fluid of a pressurizing device after filing of synthetic resin.

CONSTITUTION: The inside of a molding cavity 11 formed by descending a movable side template 20 is kept at a predetermined temperature and molten synthetic resin is injected within the cavity 11 by feeding the molten synthetic resin to a sprue 62 with pressure. In this instance, when the movable side template 20 is descended until the same abuts against a cavity block 30, a piston 82 of a pressurizing device 80 is pressed by the movable side template 20 and a cavity side 52 is swollen out into the molding cavity 11 by hydraulic pressure of hydraulic oil 85 with which the inside of a pressurizing chamber 84 is filled. Therefore, the molten resin in the molding cavity 11 is compressed in a diametral direction by the cavity side 52, stretched in an axial direction, and filled out to every nook and corner of the cavity 11 such as a male screw part 53 and air gaps are removed in detail. Therefore, the molded product can obtain sufficient accuracy.


Inventors:
Uehara, Tadayoshi
Application Number:
JP1986000169419
Publication Date:
February 04, 1988
Filing Date:
July 18, 1986
Export Citation:
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Assignee:
AIDA ENG LTD
International Classes:
B29C45/56; B29C33/42; B29L23/00; (IPC1-7): B29C45/56; B29L23/00