Based On The Three-cone Drill Cad System Pro / E,

Tri-cone rock bit is the important tool in oil drilling,so its capability and quantity affect the speed and cost of oil drilling greatly. The structure of tri-cone rock bit is complicated. As the cutting structure touch the stratum directly,it affects the process of breaking rock and the performance of tri-cone rock bit. When we design the cutting structure,it is very important to improve and enhance the design means with advanced CAD technology.Owing to its characteristic of parametric design,the famous software Pro/E of PTC,one 3D CAD/CAM system,is applied worldwide. It is not reported that any software has been developed on the engaging design of tri-cone rock bit with Pro/E workbench in China and other countries. Therefore,this software is developed with Pro/E2000i on 2D engaging design and 3D models design of cones and inserts and their assembly,and the program languages are Pro/Toolkit and Delphi.The content of this paper includes as follows:1. Set up the following 2D parametric models:(Dinitial contour of cone. (2)six types of inserts:cut insert,conical insert,ovoid insert,chisel insert,gage insert and scoop chisel insert. (3)twelve types of slots:six slots between the rows of inserts;six slots on the head of cone.2. Draw the curve of breaking rock on hole,and the curve changes along with the position of the inserts.3. Solve the key problem during the 2D engaging design of the tri-cone rock bit. If you move or rotate any insert with mouse,the other two inserts in the same cycle change same positions.4. Calculate the engaging distance between inserts and slots and the least thickness from bearing to contour of cone automatically.5. Create the 3D models of three cones.6. Set up the 3D parametric models of six inserts.7. Assemble inserts and cones respectively,and prepare for calculating 3D engaging distance of tri-cone rock bit.Application the system to the design of tri-cone rock bit,willshorten the developing cycle of new products,and improve the design quality,and increase the technology innovation of enterprise and enhance the market competition.