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US 6,568,076 B2Granted
Method of making an internally profiled stator tube
AssigneeHalliburton Energy Services, Inc.
InventorsRichard D. Bottos, Lance D. Underwood
Life of this patent
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Abstract
A method of manufacturing a thick walled Moineau-style stator entails drawing a thick walled tube through rotatable internal and external dies to form a helical outer profile including crests and through on the tube. The tube initially has one end with a diameter smaller than the others, with the smaller diameter end being inserted between the inner and outer dies, where it is seized and drawn through the dies.
Claims4
A method of manufacturing a thick walled stator by drawing, comprising:
- (a) providing a thick wall tube, said tube having a first diameter at a first end and a second diameter at a second end, wherein said second diameter is less than said first diameter;
- (b) providing a rotatable external die and a rotatable internal die, said rotatable external die and said rotatable inner die defining an area of insertion for said second end of said thick wall tube;
- (c) inserting said second end of said thick wall tube to said area of insertion;
- (d) seizing said thick wall tube;
- (e) drawing said thick wall tube through said rotatable internal die and said rotatable external die to form a helical outer profile including crests and troughs.
2 more elements
Dependencies are inferred from the claim text.