Especificação e controle de tolerância de geometrias complexas e superfícies com forma livre

Abstract

Parts with complex geometries and shapes are of great interest in many industrial applications. The main feature of these parts is the diversity of multiple geometries and tolerances. Gearboxes, engine blocks, brake discs, turbine blades etc., are examples of complex parts. The permissible variations in size and shape are transmitted in the engineering drawings by the rules of GD&T and ISO/GPS. However, these standards do not address complex geometries. The assessment of compliance with the specification is typically performed by coordinate measuring machine, but the evidence of formal metrological traceability is valid only for regular geometries. This paper makes an analysis on the ASME Y14.5 (GD&T), ISO/GPS and ABNT to dimensional and geometric tolerance specification and presents the state of the art in ensuring the metrological traceability of turbine blades and gears in machine measures coordinate measurement.