US4388027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for milling long workpieces
Assignee: Gfm Gesellschaft fur Fertigungstechnik und Maschinenbau GmbH
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Filing: 1980-09-11
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Granted: 1983-06-14
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Expires: 2000-09-11
Abstract
Abstract A distorted workpiece is initially held in a position in which it has a free sag near the center of its length. The distorted workpiece is subsequently supported near the center of its length so as to eliminate only the elastic deformation of the workpiece which is due to the free sag.
Inventors
- 👤 Gottfried Blaimschein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:54
CPC Classifications
B; B23; B23Q; B23Q1/00; B23Q1/72; B23Q1/76; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/303752; Y10T409/306664; Y10T409/30756; Y10T409/30868; Y10T409/308736; Y10T82/00; Y10T82/19; Y10T82/25; Y10T82/2593; Y10T82/2597
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
In a process of subjecting a long workpiece to a preliminary rough-milling operation causing distortion of the long workpiece by a plastic deformation and a subsequent finish-milling operation while supporting the workpiece near the center of its length, the improvement of (a) initially holding the rough-milled workpiece in a position wherein it has a free sag near the center of its length, the free sag causing an elastic deformation of the long workpiece (b) determining the extent of the free sag, and (c) supporting the workpiece near the center of its length sufficiently to eliminate solely the elastic deformation and without eliminating the distortion of the long workpiece while finish-milling the workpiece.
Claim 2
Dependent Claim
112 words
In a process of subjecting a long workpiece to a preliminary rough-milling operation causing distortion of the long workpiece by a plastic deformation and a subsequent finish-milling operation while supporting the workpiece near the center of its length, the improvement of (a) initially holding the rough-milled workpiece in a position wherein it has a free sag near the center of its length, the free sag causing an elastic deformation of the long workpiece (b) determining the extent of the free sag, and (c) supporting the workpiece near the center of its length sufficiently to eliminate solely the elastic deformation and without eliminating the distortion of the long workpiece while finish-milling the workpiece.
Claim 3
Dependent Claim
11 words
In the process of claim 1, the workpiece being a crankshaft.
Claim 4
Dependent Claim
29 words
In the process of claim 1 or 2, the rough-milling causing internal stresses in the material of the workpiece to be released to cause the distortion by plastic deformation.
Claim 5
Dependent Claim
18 words
In the process of claim 1, 2 or 3, the extent of the free sag being determined empirically.
Claim 6
Dependent Claim
19 words
In the process of claim 1, 2 or 3, the extent of the free sag being determined by calculation.
References Cited (Backward Citations)
US2290324A
Cited
US2650522A
Cited
US2567685A
Cited
US2737762A
Cited
US2737760A
Cited
GB978434A
Cited
US3590469A
Cited
US4180947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |