Flash-free molding of I.C. engine passages

Details Flash-free molding of I.C. engine passages Flash-free molding of I.C. engine passages

1989-02-15

1990-07-03

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With step of making mold or mold shaping, per se

249145, 249146, 249186, 264318, 264334, 425438, 425577, B29C 3376

Patent

active

049389092

ABSTRACT:
A method of making a molded plastic component of an internal combustion engine. The method is for making a fuel rail and includes constructing particular core pins of the mold with threaded connections that form seals between them when they are disposed in proper position within the mold cavity for the molding of a fuel rail. The core pins serve to form a main fuel passage and auxiliary fuel passages which transversely intersect the main fuel passage. Each core pin that forms an auxiliary fuel passage includes a screw thread on its inner end that threads into a corresponding complementary threaded recess in the side of the core pin that forms the main fuel passage to create a corresponding seal. This sealing prevents any significant flash from forming in the fuel rail at the intersection of each auxiliary fuel passage with the main fuel passage. After the plastic has been molded, the core pins are unthreaded and withdrawn.

REFERENCES:
patent: 2181256 (1939-11-01), Arbogast
patent: 4240498 (1980-12-01), Frenette

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