Abstract
This paper presents a high speed non-circular machining NC-lathe for cutting a piston-head of a reciprocating engine. In the non-circular machining, it is indispensable for a cutting tool to reciprocate in phase with the rotation of the main spindle. This cutting tool positioning mechanism needs high frequency response and high power. So an electro-hydraulic servomechanism was applied to the positioning mechanism, and the non-circular machining NC-lathe was developed. The machining of a piston-head needs higher speed cutting, and so the positioning servomechanism needs higher frequency response. But the previously developed positioning mechanism does not have the required frequency response because the mass of the cutting tool and the base is too heavy. So the lightening of the mass and the increase of the hydraulic power source pressure and so on have made the required frequency response possible, and the high speed non-circular machining NC-lathe has been newly developed for machining of a piston-head.
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