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There are considered the tasks of computer simulation of moldboard's surface in the article. The proposed solution is required in educational, research, and production processes. The researches were carried out using the constructive geometric modeling methods and systems. Objects of computer simulation were chosen the computer models of a directory curve, generative lines, and a frontal contour which are elements of the working surface. The geometric models of working surface elements developed based on research results were implemented in AutoCAD and SIMPLEX systems. The proposed simulation models can reduce the design period, simplify the geometric parameters' setting and facilitate the work of designers.

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