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

B - Operations, Transporting

29

C

18/680

B29C 45/00 (2006.01) B29C 33/00 (2006.01) B29C 33/48 (2006.01)

Patent

CA 2009060

10GLB0289/? 7802A 89P7802 ABSTRACT OF THE DISCLOSURE A method of making a molded plastic component of an internal combustion engine. The method disclosed is for making a fuel rail and comprises 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 comprises 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 After the plastic has been molded, the core pins are unthreaded and withdrawn.

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