Method of making pistons and piston rods as well as cylinders for hydraulic or pneumatic apparatus
OwnerGunter Weberinventor
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Abstract
Method of making pistons and piston rods as well as cylinders for hydraulic and pneumatic apparatus, whereby a precision-finished cylindrical semi-finished article made of an aluminum alloy is hard-anodized at its sliding surface and whereby the hard-anodized article is rotated about its axis and the formed ceramic sliding surface layer thereof is treated by a plurality of successive grinding operations with two-dimensional grinding media of differing reducing grain size.
Claims8
A method of making an article of manufacture made of an aluminum alloy and provided with an elongate sliding surface of substantially cylindrical configuration, comprising the steps of:
- hard-anodizing at least the elongate sliding surface;
- rotating the hard-anodized elongate sliding surface about its axis;
- subjecting the rotating elongate surface to at least one grinding operation with a first grinding web of predetermined grain size whereby dust is formed during at least a portion of the grinding operation;
- terminating the grinding operation when dust formation ceases;
- polishing the ground elongate sliding surface with a second grinding web of lesser grain size whereby a surface condition is gradually created between the elongate sliding surface and the second grinding web which causes the second grinding web to cling to the elongate sliding surface;
- and
- terminating the polishing when the surface condition has been created.
Dependencies are inferred from the claim text.