| 摘要 |
A rotary cone drill bit includes: a body, a leg depending from the body, and a bearing shaft extending from the leg. The leg includes a surface edge that is subject to wear during operation of the bit and/or a leading edge (at an outer surface or shoulder surface, for example) that is subject to wear during operation of the bit. A cone may be mounted to the bearing shaft. A bottom surface of a hard material plate having an edge is positioned with a conforming surface of the leg in a location where the edge of the hard material plate defines at least a portion of the surface edge of the leg and/or at least a portion of the leading edge of the leg. Positioning of the surfaces is made using a flowable material such as a brazing material. |
