Annular venting of tire tread molds

Details Annular venting of tire tread molds Annular venting of tire tread molds

B - Operations, Transporting

29

C

B29C 33/10 (2006.01) B29C 33/46 (2006.01) B29C 35/00 (2006.01) B29D 30/06 (2006.01) B29C 37/00 (2006.01)

Patent

CA 2508834

The present invention differs fundamentally from prior art because it provides for machining a substantial number of relatively thin annular tooling plates (10), fitting them together side-by-side in two opposed mold sides, and engraving the tread pattern into the interior face of the assembled plates in two or more complementary mold parts to form a unique tire mold (12). In one form of the disclosed construction two halves are built up and internally engraved to form a two-piece clamshell mold. This building up of annular plates (10) applies also to the construction of segmented molds, wherein there are multiple complementary mold sections which are joined to provide a complete circumferential mold. Thus, the invention applies to both two-piece clamshell molds and segmented molds. The invention encompasses an all engraved mold and all venting (22) in the circumferential direction.

La préseente invention diffère fondamentalement des précédentes car elle consiste à usiner un nombre substantiel de plaques outils annulaires (10) relativement minces, à les réunir ensemble côte à côte dans deux moitié de moule opposées, puis à graver le motif de la bande de roulement sur la face intérieure des plaques assemblées qui forment les parties complémentaires d'un même moule (12). Cette réunion de plaques annulaires (10) peut également servir à réaliser des moules segmentés présentant plusieurs parties complémentaires réunies pour former un moule circonférentiel complet. L'invention, qui concerne tant les moules en deux coquilles que les moules segmentés, porte sur des moules entièrement gravés dont tous les évents (22) sont dans le sens de la circonférence.

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