DESIGN AND USE OF CURVILINEAR SURFACES AND SURFACES IN COMBINED ELECTRODE TOOLS

The article discusses the features of using surfaces of varying degrees of curvature in the design of products using computer-aided design (CAD) systems. Currently, designers and engineers from leading industrial countries rely in their work on the classification of such surfaces by the continuity parameter from G0 to G3. In turn, in accordance with the continuity parameters (G0 - G3), manufacturers of complex and science-intensive products (automotive industry, avionics, complex household and energy equipment, etc.) put the concept of surface quality, which is described by indices C, B and A, respectively. However, it should be noted that at present there is no regulatory framework that would control or regulate the surface quality in the specified indices. It is the absence of documents in the form of GOSTs, OSTs, certification standards or ISO standards that forces various manufacturers to introduce their own internal regulatory documents defining the concept of surface quality of classes A, B and C. Work in this direction is known from such companies as Audi, SAAB, Toyota, etc. In turn, CAD developers, responding to the requests of their customers, began to develop individual modules or expand the design functionality of software products in order to ensure the ability to work with surfaces of classes A, B and C. Given the relevance of the problem associated with the possibility of implementing the design of surfaces of varying degrees of curvature in various CAD systems, the authors analyzed the features of the available tools, algorithms for its implementation and the possibilities of its application in solid modeling. General approaches to obtaining such surfaces based on interpolation and approximation curves are identified. Cases are considered in which it is advisable to use high-order Bezier curves and the features of spline and NURBS modeling are indicated. As an example of using such surfaces, the design of a combined electrode-tool (ET) for electrophysical-chemical processing methods with curvilinear channels for pumping the working fluid is given.