| 摘要 |
<p>An improved thin walled threaded spacer (20) for use in preventing thread galling in adjacent sections of drill pipe (22) in a drill string is formed by mechanically deforming a strip of copper/beryllium alloy containing 2 % beryllium to form a preform having a hollow, truncated conical section (42) and then mechanically deforming the conical section (42) to impart helical grooves (30, 32, 68) therein.</p> |
