Abstract
A three-dimensional geometric modelling system for a tillage blade was developed and adapted to CAD (Computer-Aided Design). The principle of this shape modelling is based on the spatial intersection of multiple view volumes or view cones. The intersected region results in a polyhedron when the polygonal target image is used. This polyhedron is represented in a solid model form. In this paper a solid model of a curved tillage blade is reconstructed to demonstrate its approximate shape. From the reconstructed data of this model an example drawing is made in first angle projection. Orthographic projections from chosen view angles and cross-sectional representations are illustrated. Animation is also demonstrated for motion analysis. The three-dimensional shape of the blade is also expressed by two cross-sections cut by planes perpendicular to each other. Horizontal cross-sections cut by the soil surface plane are shown for two different depths of tillage. Tangential directions are expressed at each point along the cutting edge of the blade. As this method of shape modelling is based on measurements, it can be used to model a worn blade. It is expected that it will find use for input of automated boundary data in solid mechanics and computer-aided engineering, requiring no laborious manual operation.
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