Method for forming a torus and a piston made therefrom for use i

Details Method for forming a torus and a piston made therefrom for use i Method for forming a torus and a piston made therefrom for use i

1988-02-19

1989-04-04

Arbes, Carl J.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

82 111, 82 12, B22D 11126

Patent

active

048172138

ABSTRACT:
A method of forming a finished torus of precise dimension which can be used to form piston segments for use in a rotary actuator in which a torus workpiece is rigidly mounted on a support in such a manner as to leave a first hemi-toroidal surface of the torus workpiece exposed, the support being mounted on a suitable means to rotate the torus workpiece about a fixed axis passing through the center of the torus workpiece, the first hemi-toroidal surface of the torus workpiece being turned with a circular cutting tool by moving the cutting tool in a semi-circular path across the first hemi-toroidal surface of the torus workpiece, then flipping over the torus workpiece and mounting it on the support while leaving a second hemi-toroidal surface of the torus workpiece exposed and once against moving the cutting tool in a semi-circular path across the second hemi-toroidal surface of the torus workpiece while the torus workpiece and support are rotated about the center axis of the torus to thereby produce a finished torus of second, smaller dimension. In forming pistons for use in a rotary actuator, the finished torus is cut into desired segments to form at least one piston segment.

REFERENCES:
patent: 1342983 (1920-06-01), Breen
patent: 3714703 (1973-02-01), Maples

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