Shaped multilayer metal foil shield structures and method of...

B - Operations – Transporting – 32 – B

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B32B 3/28 (2006.01) F01N 13/14 (2010.01) B21D 13/00 (2006.01) B21D 39/00 (2006.01) B60R 13/08 (2006.01) F01N 1/24 (2006.01) F16L 59/08 (2006.01) G10K 11/168 (2006.01)

Patent

CA 2297463

A forge/swage formed three-dimensional multilayer metal foil shield having areas (6) therein where the layers (21) are in a spaced apart relationship, areas (2) therein where the layers are tensioned or stretched, and areas (4) where the layers are compressed and interlocked together by folding, rolling, wrinking, curling, coiling, crimping and the like. The multilayer metal foil shield is formed by forge/swage shaping in an appropriate mold apparatus a preform of a stack of metal foil layers having gaps between the layers. The gaps are provided by embossments (7) in the layers or by spacers between the layers. The forge formed multilayer metal foil shields have utility as heat shields and acoustic shields, particularly on vehicles. The forge formed multilayer metal foil shields are mounted on automobile underbody areas, such as the bottom of the floor pan of the passenger compartment, to provide heat and sound insulation. Other automotive uses include fire wall, exhaust tunnel, motor mount and exhaust down pipe. The three-dimensional shields include multilayer metal sheet formed structures. Intermediate beaded or rolled edge multilayer metal preforms are made for transport to the final three dimensional stamping operation.

L'invention porte sur un blindage tridimensionnel de tôles empilées forgées/matricées comportant des zones (6) où les tôles (21) sont espacées, des zones (2) où les tôles sont sous tension ou étirées, et des zones (4) où les tôles sont imbriquées entre elles par pliage, cylindrage, froissage, bouclage, rabattement, etc. Ledit blindage est formé par forgeage/matriçage dans un moule approprié d'une préforme constituée par un empilement de tôles séparées les une des autres soit par des bossages (7) formés sur les tôles, soit par des entretoises. De tels blindages peuvent servir de boucliers thermiques ou acoustiques en particulier sur des véhicules où ils se montent sous certaines parties du châssis, telles que le fond des caissons du plancher de l'habitacle, qu'ils isolent thermiquement et phoniquement. Ils peuvent également servir de cloisons pare-feu, ou d'isolants pour tunnels d'échappement, supports de moteur ou collecteurs d'échappement. Les blindages tridimensionnels consistent en préformes faites de plusieurs couches detôle. Les bords des préformes peuvent être moulurés ou roulés pour faciliter l'acheminement des préformes jusqu'à leur site d'emboutissage.

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