Totaldesign of the system. The parametric drawing system of three teeth wheel drilladopts the modular programming method; the whole system is divided into fourfunctional modules: user interface management module, the bit of tooth surfacestructure design module, database management module and parametric drawingmodule.Theperformance of roller cone bitdesign ofuser interface use VBA, which is embedded in AutoCAD, to realize second toolsdevelopment. The user through the user interface module input relevantparameters of three cone bit design to realize the man-machine communication. The main function of the bit teeth structure design module is designedaccording to the theory of three cone bit three bit data for the design ofcomplex calculations. Database management module is composed of Access 2003 asa data from the establishment of the database.
Three cone bit is theimportant tool in oil drilling, whether its performance is good or bad willdirectly affect the quality of drilling, drilling efficiency and drilling cost. Three cone bit's design in the traditional is based on practical experience andcombined with the method of trial and error, repeated design and calculation, so the accuracy of design is low, the cycle is long and it is difficult toimprove the quality of design. And the design of each calculation can only be abit and with low efficiency. Therefore, to develop a set of three teeth wheeldrill bit CAD system and realize parametric drawing of three cone bit are verynecessary.