| 摘要 |
A method includes the steps of assembling cone-leg assemblies, rotating the cones on their respective cone-leg assemblies to predetermined orientations such that cutting structures of one of the cone-leg assemblies are clear from the cutting structures of neighboring cone-leg assemblies, and installing the cone-leg assemblies in a predetermined sequence such that the plurality of cone-leg assemblies to intermesh with each other. Another method includes the steps of thermally fitting a plurality of one piece extended mud nozzles into the bit body to form a plurality of substantially straight direct unobstructed mud laminar flow paths, inserting a plurality of guide pins in preformed locator recesses in the body, and orienting a pre-assembled cone-leg assembly to align a groove on an inner surface of the leg with one of the plurality of guide pins, while thermally fitting the cone-leg assembly into a preformed bore in the body. |
