Method for processing an insert pipe for use in injection molding
AssigneesMold Research Institute Co., Ltd., Kabushiki Kaisha Act One
InventorsKiyoshi Ishii, Akira Kato
Life of this patent
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Abstract
A number of holes (3) are formed in the outer circumferential wall (2) of a tubular metallic pipe (1) at regulator intervals in both circumferential and axial directions. Each of the holes (3) consists of a polygonal opening (4) and raised pieces (5) formed by bending the material from the peripheral edge surrounding the opening (3). This pipe may be used as an insert pipe in injection molding an article such as a lead screw, an optical fiber ferrule or the like. The raised pieces reinforce the part of the pipe surrounding each hole, and enhances the bonding between the molding material and insert pipe.
Claims13
An insert pipe for injection molding, wherein:
- a plurality of through holes are passed through an outer circumferential wall of a metallic pipe, and each of said through holes comprises an opening, and at least one raised piece formed by bending a wall part of said metallic pipe adjacent to said opening.
A molded article, comprising:
- an insert pipe having a plurality of through holes passed through an outer circumferential wall thereof, each of said through holes comprising an opening, and at least one raised piece formed by bending a wall part of said metallic pipe adjacent to said opening;
- an inner molded portion molded inside said insert pipe;
- and
- an outer molded portion molded outside said insert pipe and connected to said inner molded portion via said openings.
A method for processing an insert pipe for injection molding, comprising the steps of:
- placing a metallic pipe in a shape retaining support assembly in an open state, said assembly comprising a plurality of shape retaining support members each having an arcuate shape retaining surface so as to Jointly define a cavity for closely surrounding an outer profile of said metallic pipe;
- moving said shape retaining support members so as to closely surround said metallic pipe with said shape retaining surfaces of said shape retaining support members;
- and
- passing piercing punches through holes defined in said shape retaining support assembly so as to form through holes in said metallic pipe in a prescribed pattern, said piercing punches being adapted in such a manner that each of said holes comprises an opening, and at least one raised piece formed by inwardly bending a wall part of said metallic pipe adjacent to said opening.
Dependencies are inferred from the claim text.