Insert pipe for injection molding, insert pipe processing method, and molded article
AssigneeKabushiki 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.
Claims7
An apparatus for processing an insert pipe for injection molding, comprising:
- a shape retaining support assembly for holding a metallic pipe, 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,
- a plurality of piercing punches, each of which has a pointed end, that can be passed though 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 through holes formed in said metallic pipe 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.