Method of injection moulding a polymeric material insert into a

Details Method of injection moulding a polymeric material insert into a Method of injection moulding a polymeric material insert into a

1994-09-08

1996-09-03

Hughes, S. Thomas

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

264267, 264268, B29C 4514

Patent

active

055511414

ABSTRACT:
A method of forming a component having a metallic shell (12) and a plastics insert (34). The component is formed by placing the shell (12) inside the mould cavity of a mould assembly (10) which forms part of an injection moulding machine. Prior to injection of plastics material, part of the external surface of the shell (12) is spaced from the opposed surface of the mould cavity. The open end of the shell abuts the adjacent mould cavity and wall so as to form a seal. This end wall is frusto-conical in shape so that, during injection of plastics material, as the shell (12) is reformed by polymer pressure into complete engagement with the surface of the mould cavity, longitudinal contraction of the shell in response to this direct lateral strain is compensated for by the frusto-conical shape so that the seal is maintained.

REFERENCES:
patent: 2131319 (1938-09-01), Greenholtz
patent: 2700186 (1955-01-01), Stover
patent: 3004297 (1961-10-01), Stover
patent: 3307221 (1967-03-01), Bolner
patent: 4312824 (1982-01-01), Mori et al.
patent: 4496513 (1985-01-01), Ishikawa et al.
patent: 4549337 (1985-10-01), Newell et al.

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