Research & Development Of The CAD System For The High Precision Formed Turning Tools

The formed turning tool is a special tool, which has been widely used in a variety of lathes and automatic machining assembly lines. It can be applied to cut rotating-formed surfaces. It is well known that both the design precision and the efficiency of the traditional graphic/calculating methods are low. In recent years, the mutual CAD design systems have been developed. It replaces the curves with straight lines or arcs. Though it has improved tool profiles, there are still some shape errors by the use of this method. In this thesis, feature-based parameterized design system based on UG Secondary development, Windows XP System and Microsoft Visual Studio.NET has been developed. A formed turning tool realizes zero error and high efficiency design.Through further investigations into the design theory of formed turning tools and the model technology of UG, this thesis presents the zero error intersection technique and the minimum radius control point concept, which eliminates the hyperbolic errors and solves the problem of low precision of formed turning tools completely. Also feature-based parameterized design method is put forward, which reduces the time and cost of revising effectively and has improved the design efficiency of formed turning tools greatly, also solves the problem of low efficiency completely.This thesis establishes the whole structural programming, a module plan , design flow charts of formed turning tools on the basis of requirement purpose of the software. Furthermore, cutting angle, parameters of structure dimension and additional edge of formed turning tools are designed by the use of database technique, which makes the designer get rid of the dependence on the design handbook of formed turning tools. Importing swallow tail trough model method simplifies the application program. The realization of dimension-driven function and the section view of the circular-formed turning tools by means of system programming makes the detail drawings more useful/meaningful than traditional drawings, which is propitious to the widely application of the software.The test result of the software verifies the stability of the running, the accuratedesign result of the formed turning tools. All function module of the software can run accurately and reliably, and can work harmoniously. Moreover, this system realizes the integration of UG system, good man-machine interaction, expandability and portability.