Chemical mechanical machining and surface finishing

B - Operations – Transporting – 24 – B

Patent

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Details

B24B 37/04 (2006.01) B24B 5/42 (2006.01) B24B 19/02 (2006.01) B24B 19/06 (2006.01) B24B 33/00 (2006.01) B24B 37/00 (2006.01) C23C 22/73 (2006.01) C23F 1/02 (2006.01) C23F 3/00 (2006.01)

Patent

CA 2435732

The invention described herein discloses a chemical mechanical machining and surface finishing process. A conversion coating is formed on the surface of a workpiece and is removed via relative motion with a tool, thereby exposing the workpiece to further reaction with the active chemistry. Low mechanical forces are used such that the plastic deformation, shear strength, tensile strength and/or thermal degradation temperature of the workpiece are not exceeded. Since the chemical mechanical machining and surface finishing process requires little force and/or speed of contact to remove the conversion coating, the equipment's mass, complexity and cost can be significantly reduced, while simultaneously increasing machining precision and accuracy. The present invention lends itself to a very controlled rate of metal removal, and can simply surface finish the workpiece, or if desired, can surface finish the workpiece simultaneously with the shaping and/or sizing process.

L'invention porte sur un procédé d'usinage chimio-mécanique et de finition de surface. Ce procédé consiste à former un revêtement de conversion sur la surface d'une pièce et à le retirer par un mouvement relatif avec un outil, la pièce étant ainsi exposée à une autre réaction de produits chimiques actifs. On utilise des forces mécaniques faibles de sorte que la déformation plastique, la résistance au cisaillement, la résistance à la traction et/ou la température de dégradation thermique de la pièce se soient pas dépassées. Du fait que le processus d'usinage chimio-mécanique et de finition de surface nécessite peu de force et/ou de vitesse de contact pour retirer le revêtement de conversion, il est possible de réduire considérablement la masse, la complexité et le coût de l'équipement tout en améliorant simultanément la précision d'usinage. Cette invention tend à bien contrôler la vitesse de retrait du métal et peut simplifier la finition de surface de la pièce, ou si souhaité, peut effectuer la finition de surface de la pièce en même temps que le processus de conformation et/ou de calibrage.

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