US3576070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warpage minimizing process for machining metal castings
Assignee: HIGH PERFORMANCE MACHINE Inc A CORP OF MI
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Filing: 1969-05-09
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Granted: 1971-04-27
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Expires: 1989-05-09
Abstract
Abstract A process of machining metal castings to minimize warping, especially useful in manufacturing propellers. When the casting is mounted for machining its shallow parts are restrained from warping out of alignment. After machining and while still so restrained, the more critical portions, for example, those near the roots of propeller blades, are machined to contour, then shot peened. The peening hardens the machined surface, increasing its bending resistance, to minimize warping when the casting is released from restraint.
Inventors
- 👤 John T Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:20
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/02; B23Q3/06; B23Q3/062; B23Q2703/00; B23Q2703/02; B23Q2703/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49332; Y10T29/4998; Y10T29/49988; Y10T29/49989; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
For purpose of minimizing warping, the process of machining a metal casting at least part of which has a cross section defined by an outer surface comprised principally of two opposed surfaces spaced more closely than their width, comprising the steps of: mounting the casting aligned in position for machining and restraining it from warping out of such alignment, then machining at least a portion of said opposed surfaces, and peening at least a portion of the surfaces so machined, whereby to increase the bending resistance of the peened surface portion; and then releasing the casting from such restraint.
Claim 2
Dependent Claim
99 words
For purpose of minimizing warping, the process of machining a metal casting at least part of which has a cross section defined by an outer surface comprised principally of two opposed surfaces spaced more closely than their width, comprising the steps of: mounting the casting aligned in position for machining and restraining it from warping out of such alignment, then machining at least a portion of said opposed surfaces, and peening at least a portion of the surfaces so machined, whereby to increase the bending resistance of the peened surface portion; and then releasing the casting from such restraint.
Claim 3
Dependent Claim
21 words
The process defined in claim 1, wherein the step of peening is performed by propelling shot against such machined surface portion.
Claim 4
Dependent Claim
175 words
For purpose of minimizing warping, the process of machining a metal casting at least part of which has a cross section defined by an outer surface comprised principally of two opposed surfaces spaced more closely than their width, comprising the steps of: mounting the casting aligned in position for machinIng one of said opposed surfaces, and restraining it from warping out of such alignment, and then, while maintaining such restraint against warping; machining at least a portion of one of said opposed surfaces, and peening at least a portion of the surface so machined, then mounting the casting aligned in position for machining the other of said opposed surfaces and restraining it from warping out of such alignment, and then while maintaining such restraint against warping; machining at least a portion of the other of said opposed surfaces and peening at least a portion of such machined surface, whereby increased bending resistance at the peened surface portion compensates in part for the removal by machining of compressed metal at the outer surface of the casting.
Claim 5
Dependent Claim
175 words
For purpose of minimizing warping, the process of machining a metal casting at least part of which has a cross section defined by an outer surface comprised principally of two opposed surfaces spaced more closely than their width, comprising the steps of: mounting the casting aligned in position for machinIng one of said opposed surfaces, and restraining it from warping out of such alignment, and then, while maintaining such restraint against warping; machining at least a portion of one of said opposed surfaces, and peening at least a portion of the surface so machined, then mounting the casting aligned in position for machining the other of said opposed surfaces and restraining it from warping out of such alignment, and then while maintaining such restraint against warping; machining at least a portion of the other of said opposed surfaces and peening at least a portion of such machined surface, whereby increased bending resistance at the peened surface portion compensates in part for the removal by machining of compressed metal at the outer surface of the casting.
Claim 6
Dependent Claim
122 words
The process of machining metal propeller castings, comprising the steps of: mounting the casting by its hub portion in position for machining one set of its blade surfaces and securing its blade portions in desired alignment therewith; machining said set of blade surfaces at and outboard of the root junctures of the blade portions; peening the surfaces so machined, releasing the casting from such restraint; then mounting the casting alignment in position for machining the other set of its blade surfaces and restraining its blade portions in the same desired alignment therewith; machining said other set of blade surfaces at and outboard of the root junctures of the blade portions; peening the surfaces so machined; and releasing the casting from such restraint.
Claim 7
Dependent Claim
122 words
The process of machining metal propeller castings, comprising the steps of: mounting the casting by its hub portion in position for machining one set of its blade surfaces and securing its blade portions in desired alignment therewith; machining said set of blade surfaces at and outboard of the root junctures of the blade portions; peening the surfaces so machined, releasing the casting from such restraint; then mounting the casting alignment in position for machining the other set of its blade surfaces and restraining its blade portions in the same desired alignment therewith; machining said other set of blade surfaces at and outboard of the root junctures of the blade portions; peening the surfaces so machined; and releasing the casting from such restraint.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |