Method for machining compressor piston

Details Method for machining compressor piston Method for machining compressor piston

B - Operations, Transporting

23

C

B23C 3/00 (2006.01) B23B 5/40 (2006.01)

Patent

CA 2229117

A method for machining a variable displacement compressor piston. The piston is connected to a swash plate by a pair of semi-spherical shoes. One end of the piston has a slot for receiving the swash plate. The slot includes a pair of opposed walls. Each wall has a concave spherical recess for supporting one of the shoes. When forming the recesses, a tool having an asymmetrical spherical cutter is placed between the slot walls in the piston. Then, the piston is rotated about a machining axis that is perpendicular to the axis of the piston and intersects the midpoint between the walls. Then, the tool is moved such that the center of the cutter is located on the rotation axis of the piston. This forms the recesses on the walls such that the recesses conform to a single sphere, the center of which is located on the axis of the piston. -19-

Méthode d'usinage de piston de compresseur à cylindrée variable. Le piston est relié à un plateau incliné par deux demi-sphères. Une extrémité du piston comporte une fente dans laquelle peut être inséré le plateau incliné. Cette fente est notamment constituée de deux parois opposées présentant chacune un renfoncement sphérique permettant de soutenir l'une des demi-sphères. Lorsqu'on forme ces renfoncements, un outil muni d'une lame sphérique asymétrique est placé dans le piston entre les parois de la fente. Puis, on fait tourner le piston autour d'un axe d'usinage perpendiculaire à l'axe du piston et entrant en intersection avec le point médian des deux parois. On déplace ensuite l'outil de telle sorte que le centre de la lame se situe sur l'axe de rotation du piston. On forme ainsi les renfoncements des parois en leur donnant la configuration d'une sphère au centre de laquelle passe l'axe du piston.

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