US3692429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor structure and method of broaching the same
Assignee: Westinghouse Electric Corp
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Filing: 1971-02-01
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Granted: 1972-09-19
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Expires: 1991-02-01
Abstract
Abstract A method of broaching an axial row of grooves for roots or rotor blades in a multi-stage, frusto-conical rotor structure by inclining the angle of reciprocation of the cutting tool of the broach relative to the periphery of the rotor structure and to the axis of rotation of the rotor. The grooves in the largest diameter land are cut to the full size of the broach, while the succeeding lands are cut with a smaller portion of the cutting tool in a diminishing manner, with the smallest diameter land having blade root grooves of smallest cross-sectional area. The resulting structure is a rotor having a plurality of increasing diameter lands, each land having an annular row of grooves, the grooves in each land axially aligned with the grooves in the adjacent lands to form a plurality of axial rows of grooves. The grooves in the smallest diameter lands have smaller grooves than those in the largest diameter lands.
Inventors
- 👤 Arnold H Redding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:03
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3007; B; B23; B23D; B23D37/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A method of cutting grooves in a multi-stage rotor structure comprising the steps of: a. inclining the angle of attack of the cutting tool relative to the periphery of the rotor structure; b. relatively moving the cutting tool along a line forming an acute angle with respect to the axis of the rotor and into engagement with the rotor structure; and c. cutting the grooves in the rotor structure so that the end adjacent the rotor structure is cut to the full size of the cutting tool, while the succeeding portions of the rotor are cut with a corresponding smaller portion of the cutting tool.
Claim 2
Independent Claim
105 words
A method of cutting grooves in a multi-stage rotor structure comprising the steps of: a. inclining the angle of attack of the cutting tool relative to the periphery of the rotor structure; b. relatively moving the cutting tool along a line forming an acute angle with respect to the axis of the rotor and into engagement with the rotor structure; and c. cutting the grooves in the rotor structure so that the end adjacent the rotor structure is cut to the full size of the cutting tool, while the succeeding portions of the rotor are cut with a corresponding smaller portion of the cutting tool.
Claim 3
Dependent Claim
30 words
The method recited in claim 1 and further including the initial step of machining the rotor structure to form a plurality of annular gaps defined by radially extending annular lands.
Claim 4
Dependent Claim
13 words
The method recited in claim 1, wherein broaching is the method of cutting.
Claim 5
Dependent Claim
59 words
The method recited in claim 1 and further including the steps of: a. machining the rotor structure to form a plurality of annular gaps defined by radially extending lands, and b. broaching the lands so that a portion of the cutting tool cutting the land adjacent the cutting tool does not cut the land furthest from the cutting tool.
Claim 6
Dependent Claim
62 words
The method recited in claim 1 wherein the rotor structure is frusto-conically shaped so that step 1 (c) further comprises cutting the grooves so that the largest diameter end of the rotor structure is cut to the full size of the cutting tool while the diminishing diameter potions of the rotor are cut to a cOrresponding smaller size of the cutting tool.
Claim 7
Dependent Claim
142 words
A multi-stage rotor structure for carrying a plurality of blades in an axial flow multi-fluid utilizing machine said rotor structure comprising: a plurality of radially extending lands; each of said lands defining an annular array of equally spaced and axially disposed grooves for carrying blades having roots of the side entry type; each of said arrays having an equal number of grooves and said array of groves in each land being aligned axially with corresponding arrays of grooves in the other lands to from a plurality of axial rows of grooves, said lands varying in diameter, and the depth of the grooves in each land being a direct function of the outer diameter of the land so that the larger diameter lands have deeper grooves and the grooves in the smallest diameter land is duplicated in a portion of the other lands.
Claim 8
Dependent Claim
142 words
A multi-stage rotor structure for carrying a plurality of blades in an axial flow multi-fluid utilizing machine said rotor structure comprising: a plurality of radially extending lands; each of said lands defining an annular array of equally spaced and axially disposed grooves for carrying blades having roots of the side entry type; each of said arrays having an equal number of grooves and said array of groves in each land being aligned axially with corresponding arrays of grooves in the other lands to from a plurality of axial rows of grooves, said lands varying in diameter, and the depth of the grooves in each land being a direct function of the outer diameter of the land so that the larger diameter lands have deeper grooves and the grooves in the smallest diameter land is duplicated in a portion of the other lands.
Claim 9
Dependent Claim
30 words
The structure recited in claim 6, wherein the grooves in each array are uniform in cross section and are equally spaced from the axis of rotation of the rotor structure.
Claim 10
Dependent Claim
28 words
The structure recited in claim 6, wherein the rotor structure is frusto-conically shaped so that the lands are of diminishing cross section from one end to the other.
Claim 11
Dependent Claim
31 words
The structure recited in claim 6, wherein the rotor structure is frusto-conically shaped and the grooves in the lands are of diminishing cross-section corresponding to the diminishing diameter of the lands.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |