Composite utility knife blade, and method of making such a...

Details Composite utility knife blade, and method of making such a... Composite utility knife blade, and method of making such a...

B - Operations, Transporting

26

B

B26B 21/58 (2006.01) B21D 53/64 (2006.01) B21K 11/02 (2006.01) B26B 9/00 (2006.01)

Patent

CA 2454815

A composite utility knife blade (10) and method of making such a blade involves butt joining a tool steel wire (44) to a front edge of an alloy steel backing strip (34). The wire (44) is electron beam welded to the backing strip (34) to form a composite strip (46) defining a first metal portion (20) formed by the alloy steel backing strip (34), a second metal portion (22) formed by the tool steel wire (44), and a weld region (28) joining the first and second metal portions (20, 22). The composite strip (46) is then annealed, and the annealed strip is straightened to eliminate any camber therein. The annealed composite strip (46) is then hardened such that the first metal portion (20) defines a surface hardness within the range of approximately 38 Rc to approximately 52 Rc, and the second metal portion (20) defines a surface hardness within the range of approximately 60 Rc to approximately 75 Rc.

Cette invention concerne une lame (10) de couteau tout usage composite ainsi qu'un procédé de fabrication d'une telle lame, lequel procédé consiste à assembler bout à bout un fil (44) d'acier à outil à un bord avant d'une bande de soutien (34) en acier allié. Le fil (44) est soudé par bombardement électronique à la bande de soutien (34) afin de former une bande composite (46), définissant une première partie métallique (20) formée par la bande de soutien (34) en acier allié, une seconde partie métallique (22) formée par le fil (44) d'acier à outil, et une zone de soudage (28) assemblant la première et la deuxième partie métallique (20, 22). La bande composite (46) est ensuite recuite, puis la bande recuite est redressée afin d'éliminer tout cambrage de la bande. La bande composite (46) recuite est ensuite durcie de sorte que la première partie métallique (20) définisse une dureté superficielle comprise entre environ 38 Rc et environ 52 Rc, et que la seconde partie métallique (22) définisse une dureté superficielle comprise entre environ 60 Rc et environ 75 Rc.

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