VERFAHREN ZUR HERSTELLUNG EINES SCHAUFELRADES ODER EINES ROTORS MIT EINEM ODER MEHREREN SCHAUFELN FUER EINE TURBINENPUMPE MITTELS FUNKENBEARBEITUNG UND DESSEN ERZEUGNISSE.

摘要

A process for manufacturing impellers of turbine pumps provides for subjecting disks (2) corresponding to the impeller to be obtained to electrical discharge machining, using tools (1) in form of plates (4, 10) provided with radial slits (5, 5 min ) extending along at least an arc of circumference and opening into hollow areas (7, 12). A combined motion of rotation and translation is imparted to the disks (2), thus generating twisted blades (9) having a profile with defined geometric characteristics. A one-piece rotor can be manufactured employing open tools (10a, .. 10n) with slits (5 min ) formed along a semicircumference, and two passages in succession of the workpiece through the tools, moving the workpiece with a combined motion of rotation and translation. An advantageous application of the so manufactured article is that for a rotor of turbomolecular pumps, since the compression ratio and the pumping speed are optimized and a considerable structural sturdiness of the article is obtained.