| 摘要 |
A method of machining the bore (14) of a progressive cavity pump two- lobe stator (12) body with a cylindrical bore (16) concentric the longitudinal axis (20) of the stator having a diameter (Rl) not less than the minor diameter of the finished stator. First (100a) and second (100b) machining devices supported on said minor diameter are employed. The first device (100a; fig. 6), comprising a milling head (50) on the end of a shaft (40) with a rotary cutter rotating about an axis (120) transverse the longitudinal axis (20), is driven through the bore multiple times along a helical path, rough milling helical grooves. The second device (100b; figs 7 to 17), comprising a whirling cutter (80) rotating about an axis (124) parallel the longitudinal axis but radially offset therefrom by a selectively variable degree, is driven through the bore (14) along the same helical path, finish milling the lobes. The whirling milling cutter device (100b) and a method of milling a lobed stator bore using the whirling cutter device) supported on the minor diameter of the bore are also claimed. |
