Broaching and/or friction welding techniques to form undercut pdm stators
AssigneeBasintek, LLC
InventorsPeter Thomas Cariveau, Chinh Trung Nguyen
Life of this patent
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Abstract
In some embodiments, a method is disclosed for manufacturing an undercut stator from a unitary cylindrical workpiece using broaching techniques. In other embodiments, methods are disclosed for manufacturing undercut and non-undercut stators using friction welding techniques to conjoin threaded end sections to stator sections having helical pathways formed therein.
Claims20
A method for manufacturing one end of an undercut stator, the method comprising the steps of:
- (a) providing a cylindrical tube as a single workpiece, the tube having a tube length and a cylindrical internal surface;
- (b) designating a first end connection portion of the tube length at a first end of the tube, and designating a stator portion of the tube length wherein the stator portion immediately neighbors the first end connection portion;
- (c) forming a plurality of helical pathways on the internal surface of the stator portion, each helical pathway having a common major helical diameter and a common minor helical diameter, wherein step (c) includes the substep of:
- (c1) forming at least one of the helical pathways at least in part by broaching;
- and
- (d) forming threads on the internal surface of the first end connection portion such that the threads provide an internal minimum thread diameter, wherein the major helical diameter is selected to be greater than the internal minimum thread diameter.
A method for manufacturing one end of an undercut stator, the method comprising the steps of:
- (a) providing an end tube with a cylindrical end internal surface and an end tube nominal diameter;
- (b) providing a stator tube with a cylindrical stator internal surface;
- (c) forming a plurality of helical pathways on the stator internal surface, each helical pathway having a common major helical diameter and a common minor helical diameter;
- (d) designating a connecting end of the end tube and a connecting end of the stator tube, wherein the connecting ends of the end tube and the stator tube are to be conjoined;
- (e) preparing the connecting ends of the end tube and the stator tube for friction welding together;
- (f) friction welding the connecting ends of the end tube and the stator tube together;
- and
- (g) forming threads on the end internal surface such that the threads provide an internal minimum thread diameter, wherein the major helical diameter is selected to be greater than the internal minimum thread diameter.
A method for manufacturing one end of a stator, the method comprising the steps of:
- (a) providing an end tube with a cylindrical end internal surface;
- (b) providing a stator tube with a cylindrical stator internal surface;
- (c) forming a plurality of helical pathways on the stator internal surface, each helical pathway having a common major helical diameter and a common minor helical diameter;
- (d) designating a connecting end of the end tube and a connecting end of the stator tube, wherein the connecting ends of the end tube and the stator tube are to be conjoined;
- (e) preparing the connecting ends of the end tube and the stator tube for friction welding together;
- and
- (f) friction welding the connecting ends of the end tube and the stator tube together.
Dependencies are inferred from the claim text.