VCMとPZTを応用したハイブリッド方式高速非真円創成機構の開発

概要

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This paper presents a high speed non-circular generating mechanism for a piston-head of a reciprocating engine. An ordinary piston-head has the complicated cross-section whose profile is ellipse with harmonic components, so that it is difficult to machine the workpiece at high speed by the copying lathe which is used generally. In order to solve this problem, an NC-tool positioning mechanism using hybrid system which has both the VCM's feature, long stroke, and the PZT's feature, fast response was developed. And a periodic learning control method was also developed which corrects the NC data in the frequency domain. The PZT is mounted coaxially on the top of the externally pressurized slideway which guides the VCM, and the sum of these two actuators' displacement becomes cutting tool's displacement. On account of sharing the harmonic components of profile, i.e.lower components to the VCM, higher components to the PZT, the piston-head can be machined more than three times as fast as the conventional system at the speed of 3000min^<-1>, resulted in the accuracy of ±3μm tolerance.
社団法人精密工学会の論文
1992-09-05