Method of forming a toothed cutting blade

B - Operations – Transporting – 23 – D

Patent

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B23D 63/06 (2006.01) B23D 65/00 (2006.01) B23P 15/44 (2006.01)

Patent

CA 2270981

Toothed cutting blades are made by forming spaced slots in an edge of a blade preform (20) to leave lands (8) between leading and trailing walls (4, 6) defining the slots, the leading walls (4) having a rake angle greater than that required in the finished blade, and the lands having aligned top surfaces between the slots, and then applying bending forces to the lands (8) so as to reduce the rake angle of the front walls to that desired and incline the top surfaces to form positively raked teeth with inclined back surfaces (32). The lands may be bent by tools inserted in the slots, or by compressing their material between punches applied adjacent their front walls.

L'invention concerne des lames tranchantes dentées, qui sont fabriquées par formation de fentes espacées dans un bord d'une préforme (20) de lame, de manière à laisser des îlots (8) entre des parois d'attaque et des parois de traîne (4, 6) définissant les fentes, les parois d'attaque (4) étant dotées d'un angle de coupe supérieur à celui requis dans la lame finie, et les îlots étant pourvus de surfaces supérieures alignées entre les fentes; par application ultérieure de forces de pliage aux îlots (8), de façon à réduire l'angle de coupe des parois antérieures à l'angle voulu, et à incliner les surfaces supérieures afin de former des dents de coupe dotées de surfaces arrière (32) inclinées. Les îlots peuvent être courbés par des outils insérés dans les fentes, ou par compression du matériau qui les constitue entre des poinçons appliqués de façon adjacente à leurs parois antérieures.

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