Abstract
Centering cylindrical parts is a very common operation meet in different cutting processes on various types of machine tools. To this purpose they are intended to use auxiliary assemblies known as "centering devices", they can achieve centering "between centers" on exterior or interior cylindrical parts surfaces, and are of the following types: universal, special or specialized, single or multiple. Solutions constructive diversity and the their drive variants known in technical literature is huge and mainly is limited numerically by restrictions related on the one hand, by technical indicators: diameter range of machining parts production batch number, type of the drive, and the machine-tools type that will make his job, positioning accuracy required, and on the other hand, economic indicators: processing costs, cost device maintenance costs. Limiting the topic only to the cylindrical parts with at least two steps of diameters that require centering on outer cylindrical surfaces, the known centering devices variants are reduced mainly to those using pairs of V-shaped prisms and with synchronous movement. The difficulty of working with such devices is the multitude and softness adjustments to be made; so that the part axis remains invariant spatial after fixing the cylindrical part on at least two levels simultaneously. The paper proposes a special prism profiled, used in the construction of such centering device in which one of the operative surfaces of the prism is not flat, but curved surface, which was determined analytically.
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