US4024742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of lubricating a cold reduction mill
Assignee: National Steel Corp
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Filing: 1975-09-22
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Granted: 1977-05-24
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Expires: 1995-09-22
Abstract
Abstract A method for efficiently operating a steel rolling mill employing oil-in-water emulsions as lubricants which includes controlling the stability of the emulsion within certain preselected limits and correlating the oil concentration to a mean time (tm) of such values. The mean time is determined through an emulsion stability index test and constitutes the time required for the concentration of oil in emulsion samples to drop to 50% of its original value.
Inventors
- 👤 Michael G. Vucich
- 👤 Michael X. Vitellas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:26
CPC Classifications
B; B21; B21B; B21B45/00; B21B45/02; B21B45/0269; B21B45/029; B21B45/0296; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A method of controlling the operation of a steel strip rolling mill comprising charging the mill with a oil-in-water emulsion lubricant, testing the stability of the emulsion as determined by a progression of emulsion stability index values, treating the emulsion to maintain its stability within a preselected range of said index values and correlating the oil concentration in the emulsion with said range of index values.
Claim 2
Independent Claim
66 words
A method of controlling the operation of a steel strip rolling mill comprising charging the mill with a oil-in-water emulsion lubricant, testing the stability of the emulsion as determined by a progression of emulsion stability index values, treating the emulsion to maintain its stability within a preselected range of said index values and correlating the oil concentration in the emulsion with said range of index values.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the charging of said lubricant is effected by a direct application thereof to the steel strip, and discarding the lubricant after its use in the mill.
Claim 4
Dependent Claim
33 words
The method of claim 2 wherein the emulsion stability index values are plotted against time increments to establish a mean time which is to be maintained within the range 0.25 to 5.5 minutes.
Claim 5
Dependent Claim
55 words
The method as defined in claim 1 wherein the charging of said lubricant is effected by a direct application thereof to the steel strip, and thereafter recycling said lubricant from a storage means for reapplication to said strip, said testing of the lubricant being performed periodically over the term of its use in the mill.
Claim 6
Dependent Claim
32 words
The method of claim 4 wherein the emulsion stability index values are plotted against time increments to establish a mean time which is maintained within the range of 0.5 to 12 minutes.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |