| 摘要 |
A gate screw rotor forming one part of a set of screw rotors for a screw rotor machine which has a helical sealing ridge at the intersection between a first concavely curved flank of a helical thread and an arcuate crest portion of the profile whereas the said crest portion merges in a second concavely curved flank of the thread with a rounded profile portion. The gate rotor is cut by means of a cutter having blades each one of which cut the entire profile of the threads from the leading side of said ridge through the bottom of the groove to the trailing side of the ridge. The main rotor of a screw rotor set for such a machine may be manufactured in similar way.
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