Marine Propeller Based On Ug Cad/cam System Development

Marine propeller is the core component of marine power system, its precision of design and manufacture directly influences the performance of ship. As propeller is a kind of complex freeform surface part, the difficulty of its design and manufacture is high. Traditional method of design and manufacture is backward, it’s time-consuming, and the accuracy is hard to guarantee. As the development of NC machining technology, it gradually uses NC machine tool to process propeller. Because manual programming of blade surface is more difficult, the cycle of programming is longer, and it seriously affects the processing efficiency of propeller, auto-programming of propeller is particularly important.Nowadays NC programming method of domestic propeller manufacturing enterprises is relatively backward, although some enterprises have imported common CAD/CAM software, it has not yet played an important role in NC programming of propeller due to complicated programming operation, demanding programmer’s experience and repetitive work,. If importing foreign special CAD/CAM software of propeller, the price is extremely expensive, and many companies are hard to undertake.In order to solve the problem above, the design method of propeller, process planning, CNC machining and other aspects have been studied. And on this basis, CAD/CAM system of marine propeller has been developed. Main research content and achievement of this paper are as follows:(1) Research the classification method of propeller, according to map design method of propeller, conclude and summarize design size table of all kinds of propeller (including blade profile size table and blade section size table), put all the data into the database, and it provides necessary data support for CAD system of propeller.(2) Analysis structural feature of all kinds of propeller, combined with the modeling principle of free-form surface, and come to the modeling method of propeller and similarities and differences of all kinds of propeller modeling. On this basis, study parametric modeling technology, and take VC++and UG/Open Grip as tools to develop data point calculation module and drawing generation module, eventually realize parametric modeling of propeller.(3) Apply knowledge based engineering technology into the process of NC programming, summarizes the NC machining technology of all kinds of propeller, and form general knowledge base (including process knowledge base library, tool library, cutting parameter library, machine and post-processing library and template library). On this basis, build machining knowledge template, this provide necessary data support for intelligent programming of propeller. Take UG/Open and VC++6.0as tools to develop intelligent NC programming system of propeller, in the end verify the research result by NC programming of the propeller example.(4) At last construct the whole machining process system based on the platform of VERICUT, and verify the accuracy of NC programming by machining simulation.