US3754425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling mills
Assignee: Individual
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Filing: 1971-07-14
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Granted: 1973-08-28
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Expires: 1991-07-14
Abstract
Abstract A rolling mill is provided having a roll line made up of a plurality of successive three roll stands, each defining a pass, which line includes at least two sizing passes disposed beyond a row of flat passes, the rolls of each sizing pass having sizing grooves shaped so that the reduction in cross section of the work in the pass defined by the sizing grooves is at an analytical minimum when the work is in a non twisted state between passes.
Inventors
- 👤 A Bindernagel
- 👤 W Demny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:08
CPC Classifications
B; B21; B21B; B21B1/00; B21B1/16; B21B1/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A rolling mill comprising a roll line having a plurality of successive three-roll stands each defining a pass line including a last flat pass intermediate the ends of the pass line having rolls with means to roll metal stock into a generally equilateraL triangle having equally truncated apices at all angles, at least two sizing passes disposed after said last flat pass, the rolls of a first sizing pass having arcuate sizing grooves so shaped that the radius of curvature at the bottom of the groove is greater than the distance between the axis of the pass and the bottom of the groove and the rolls of a second sizing pass having arcuate sizing grooves shaped so that the curvature of the grooves is elliptical with the radius of curvature at the bottom of the groove being a smaller circle and being less than the distance between the axis of the pass and the bottom of the arcuate groove, said rollers of said first and second sizing passes being offset relative to one another by half a pitch angle.
Claim 2
Dependent Claim
179 words
A rolling mill comprising a roll line having a plurality of successive three-roll stands each defining a pass line including a last flat pass intermediate the ends of the pass line having rolls with means to roll metal stock into a generally equilateraL triangle having equally truncated apices at all angles, at least two sizing passes disposed after said last flat pass, the rolls of a first sizing pass having arcuate sizing grooves so shaped that the radius of curvature at the bottom of the groove is greater than the distance between the axis of the pass and the bottom of the groove and the rolls of a second sizing pass having arcuate sizing grooves shaped so that the curvature of the grooves is elliptical with the radius of curvature at the bottom of the groove being a smaller circle and being less than the distance between the axis of the pass and the bottom of the arcuate groove, said rollers of said first and second sizing passes being offset relative to one another by half a pitch angle.
Claim 3
Dependent Claim
19 words
A rolling mill as claimed in claim 1, wherein a plurality of first and second sizing passes are provided.
Claim 4
Dependent Claim
49 words
A rolling mill as claimed in claim 2, in which the number of sizing passes is even and in which the rollers of the first sizing pass following the row of flat passes is angularly symmetrical relative to those of the last pass in the row of flat passes.
Claim 5
Dependent Claim
65 words
A rolling mill as claimed in claim 2, in which the number of sizing passes is even and all the stands are positioned in the line with; the rollers in adjacent stands angularly offset relative to one another, and in which the last flat pass is dimensioned to effect section transverse a reduction of a metal stock having said truncated apices transverse to said rollers.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |