| 摘要 |
<p>A method of manufacturing a rolling cutter drill bit comprising a bit body which carries cutter assemblies each of which includes a cutter journal (22) on the bit body, a cutter (18) rotatably mounted on the journal, and a threaded retention ring (30) screwed onto the cutter (18) to retain the cutter on the journal while permitting a limited degree of axial displacement of the cutter relative to the journal. The method comprises the steps of predetermining a desired magnitude of maximum permitted axial displacement between the cutter and the journal, and then employing components (30, 62, 68, 109) for the cutter assembly which are so dimensioned as to provide, when assembled to form the cutter assembly, a maximum permitted axial displacement (44) which is not greater than the predetermined magnitude. The appropriately dimensioned components may be specifically manufactured to the required size, or may be selected from a stock of components of differing sizes. Alternatively the maximum permitted axial displacement may be determined by adjusting the axial position of the retaining ring (30) on the cutter during assembly. <IMAGE></p> |
