US3878353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for finishing rolls
Assignee: Ingersoll Milling Machine Co
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Filing: 1973-12-10
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Granted: 1975-04-15
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Expires: 1993-12-10
Abstract
Abstract Rolling mill rolls, such as the final rolls for a sheet cold rolling operation, are machined by electrical discharges in a lathe-type machine with a roll length electrode tool. High areas of the roll shape the adjacent surface of the electrode tool, either by a mechanical or electrical wear-in operation, so that such surface substantially complements the desired final roll contour. The shaped electrode tool is subsequently used for electrical discharge machining (EDM) the roll to the level of the lowest roll portions so as to impart a very uniform matte texture to the roll surface and provide a roll with substantially perfect cross-sectional circularily. If the machining is carried out with a segmented electrode tool, the tool is preferably moved slightly from time-to-time axially of the roll during at least the final stages of the machining process. Following the machining, the roll may be used without further processing as an improved substitute for rolls textured by the conventional shot blasting technique or it may be ground to a bright polish.
Inventors
- 👤 Alex Lennart Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:11
CPC Classifications
B; B21; B21B; B21B28/00; B21B28/02; B23; B23H; B23H9/00; B23H9/04; B21B27/00; B21B27/005
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
208 words
A method of finishing an eleongated working surface of a roll subject to axially and circumferentially distributed low radius defect areas to an ultimately desired design roll contour of substantially perfect cross-section circularity, said method comprising the steps of rotating the roll with respect to a substantially equally elongated narrow electrode tool positioned parallel to the roll axis having an edge contoured to complement the ultimately desired contour for said roll working surface, said edge being adjacent to but slightly spaced from said working surface; supplying a series of uniform over-voltage initiated discharges between the electrode and the roll working surface to remove particles from the working surface areas successively least distant from the electrode tool by discharge machining; and moving said electrode tool toward the axis of the roll working surface to maintain a substantially constant gap between the electrode edge and the successively least distant areas of said working surface as particles are removed from the roll working surface while continuing the supply of discharges until particles have been removed from the entire roll working surface to thereby impart a matte texture to said workinig surface, provide substantially perfect cross-sectional circularity for said working surface, and substantially conform said working surface to said ultimately desired contour.
Claim 2
Independent Claim
208 words
A method of finishing an eleongated working surface of a roll subject to axially and circumferentially distributed low radius defect areas to an ultimately desired design roll contour of substantially perfect cross-section circularity, said method comprising the steps of rotating the roll with respect to a substantially equally elongated narrow electrode tool positioned parallel to the roll axis having an edge contoured to complement the ultimately desired contour for said roll working surface, said edge being adjacent to but slightly spaced from said working surface; supplying a series of uniform over-voltage initiated discharges between the electrode and the roll working surface to remove particles from the working surface areas successively least distant from the electrode tool by discharge machining; and moving said electrode tool toward the axis of the roll working surface to maintain a substantially constant gap between the electrode edge and the successively least distant areas of said working surface as particles are removed from the roll working surface while continuing the supply of discharges until particles have been removed from the entire roll working surface to thereby impart a matte texture to said workinig surface, provide substantially perfect cross-sectional circularity for said working surface, and substantially conform said working surface to said ultimately desired contour.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said electrode tool is divided into segments insulated from each other, and the discharges are provided between each segment and the roll.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein said electrode tool is divided into segments insulated from each other, with said segments having comlimentarily beveled overlapping end positions; and the discharges are provided between each segment and the roll.
Claim 5
Dependent Claim
23 words
The method of claim 3 further including the step of moving the electrode tool from time-to-time longitudinally of the roll within prescribed limits.
Claim 6
Dependent Claim
33 words
The method of claim 3 wherein the complimentarily bevels for the end positions of the segments are selected to provide a substantially uniform effective width for said electrode tool along its entire length.
Claim 7
Dependent Claim
148 words
The method of claim 5 further including the step of moving the electrode tool from time-to-time longitudinally of the roll, the amount of said movement being limited so that the distance traversed by said electrode tool is no greater than the distance longitudinally of the roll between corresponding ends of two adjacent segments. 7.The method of claim 1 wherein said electrode tool is divided into a plurality of equal length segments electrically insulated from each other, said segments having end positions complimentarily beveled at angles selected so that each segment is aligned in the direction of roll rotation in overlying relationship with an adjacent segment whereby the electrode tool has a substantially uniform effective edge width defined at any point along its length by a part of one segment and a part of another segment; and the discharges are supplied between each segment and the roll working surface.
Claim 8
Dependent Claim
47 words
The method of claim 7 further including the step of moving the electrode tool from time-to-time longitudinally of the roll, with said movement being limited so that the total distance traversed by said electrode tool is very small relative to the length of the roll working surface.
Claim 9
Dependent Claim
59 words
The method of claim 7 further including the step of oscillating the electrode tool longitudinally of the roll during the finishing of the roll working surface and until partiCles have been removed from the entire roll working surface, with the oscillatory movement being limited so that the distances traversed by said electrode tool does not exceed the segment length.
Claim 10
Dependent Claim
25 words
The method of claim 9 wherein the oscillatory movement is limited so that the distance traversed by the electrode tool substantially equals the segment length.
Claim 11
Dependent Claim
38 words
The method of claim 1 further including the step of abrading the roll working surface to remove the matte texture while substantially retaining the cross-sectional circularity and desired contour provided for the working surface by the discharge machining.
Claim 12
Dependent Claim
76 words
The method of claim 1 wherein said electrode edge is contoured by positioning the electrode parallel to the longitudinal axis of the roll with said edge spaced from the roll surface; rotating the roll on said axis to generate a locus profile defined by the maximum radius run-out of the roll; and moving the electrode tool toward the roll axis to cause the roll to shape the electrode edge to a contour complementing said locus profile.
Claim 13
Dependent Claim
34 words
The method of claim 12 wherein the electrode edge contour approximates the locus profile prior to the shaping, and the electrode tool is comprised of a plurality of segments electrically insulated from each other.
Claim 14
Dependent Claim
50 words
The method of claim 12 wherein the electrode edge contour approximates the locus profile to the shaping, the electrode is soft and friable relative to the roll surface, and the electrode is moved into frictional engagement with the roll surface with sufficient force for shaping the electrode edge by abrasion.
Claim 15
Dependent Claim
55 words
The method of claim 12 wherein the electrode remains slightly spaced from the roll surface after being moved toward the roll axis, and further including the step of supplying a series of over-voltage initiated discharges between the electrode tool and the roll for removing particles from the electrode tool to thereby shape the electrode edge.
Claim 16
Dependent Claim
32 words
The method of claim 15 wherein the electrode tool is comprised of a plurality of segments electrically insulated from each other, and the discharges are supplied between each segment and the roll.
Claim 17
Dependent Claim
35 words
The method of claim 15 wherein the shaping of the electrode edge is carried out with an electrical polarity between the electrode tool and roll selected to provide a minimum roll to electrode wear ratio.
Claim 18
Dependent Claim
38 words
A method as set forth in claim 1 which includes the preliminary step of grinding the roll to approximate cross-sectional circularity leaving a generally helical pattern of high radius areas axially and circumferentially distributed on said working surface.
Claim 19
Dependent Claim
27 words
The method of claim 18 further including the subsequent step of finishing grinding the roll with a cut substantially lighter than used in the earlier grinding step.
Claim 20
Dependent Claim
54 words
The method of claim 18 wherein the electrode edge has a width which is very small relative to the circumference of the roll, and the electrode edge is shaped to complement the desired final contour for the roll working surface by said over-voltage initiated discharges before any substantial changes in said generally helical pattern.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |