US3869894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating iron and steel workpieces prior to cold working
Assignee: Henkel Corp
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Filing: 1973-11-05
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Granted: 1975-03-11
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Expires: 1993-11-05
Abstract
Abstract Disclosed is a method for treating iron and steel workpieces prior to cold working. The workpieces are pretreated to a temperature of 50*-150*C. and contacted with an aqueous suspension containing solid lubricants of laminar lattice structure. The parts are simultaneously subjected to relative movement so as to cause intercontact between the parts for a period of time sufficient to permit evaporation of a predominant part of the water in the suspension. The quantity of suspension employed is sufficient to yield 5-50 g. active content/m2 workpiece surface area.
Inventors
- 👤 Norbert Meyer
- 👤 Han Yong Oei
- 👤 Werner Rausch
- 👤 Horst Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:27
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
In a method for the treatment of shaped iron and steel workpieces prior to cold working, making use of aqueous suspensions which contain phospHoric acid, suspended substances with laminar lattice structures and surfactants, the improvement comprising preheating said workpieces to a temperature between 50* and 150*C, effecting a motion of said workpieces relative to each other sufficient to cause intercontact while simultaneously contacting said workpieces with said suspension having active content in an amount of between 5 and 50 g/m2 of workpiece surface area and comprising 5-50% of a laminar lattice compound, 0.5-14% H3PO4 and 0.05-1 % surfactant, and continuing said motion until a predominant part of the water is said suspension has been evaporated.
Claim 2
Dependent Claim
115 words
In a method for the treatment of shaped iron and steel workpieces prior to cold working, making use of aqueous suspensions which contain phospHoric acid, suspended substances with laminar lattice structures and surfactants, the improvement comprising preheating said workpieces to a temperature between 50* and 150*C, effecting a motion of said workpieces relative to each other sufficient to cause intercontact while simultaneously contacting said workpieces with said suspension having active content in an amount of between 5 and 50 g/m2 of workpiece surface area and comprising 5-50% of a laminar lattice compound, 0.5-14% H3PO4 and 0.05-1 % surfactant, and continuing said motion until a predominant part of the water is said suspension has been evaporated.
Claim 3
Dependent Claim
114 words
IN A METHOD FOR THE TREATMENT OF SHAPED IRON AND STEEL WORKPIECES PRIOR TO COLD WORKING, MAKING USE OF AQUEOUS SUSPENSIONS WHICH CONTAIN PHOSPHORIC ACID, SUSPENDED SUBSTANCES WITH LAMINAR LATTICE STRUCTURES AND SURFACTANTS, THE IMPROVEMENT COMPRISING PREHEATING SAID WORKPIECE TO A TEMPERATURE BETWEEN 50* AND 150*C, EFFECTING A MOTION OF SAID WORKPIECES RELATIVE TO EACH OTHER SUFFICIENT TO CAUSE INTERCONTACT WHILE SIMULTANEOUSLY CONTACTING SAID WORKPIECES WITH SAID SUSPENSION HAVING ACTIVE CONTENT IN AN AMOUNT OF BETWEEN 5 AND 50 G/M2 OF WORKPIECE SURFACE AREA AND COMPRISING 5-50% OF A LAMINAR LATTICE COMPOUND, 0.5-14% H3PO4 AND 0.05-1% SURFACTANT, AND CONTINUING SAID MOTION UNTIL A PREDOMINANT PART OF THE WATER IS SAID SUSPENSION HAS BEEN EVAPORATED.
Claim 4
Dependent Claim
114 words
IN A METHOD FOR THE TREATMENT OF SHAPED IRON AND STEEL WORKPIECES PRIOR TO COLD WORKING, MAKING USE OF AQUEOUS SUSPENSIONS WHICH CONTAIN PHOSPHORIC ACID, SUSPENDED SUBSTANCES WITH LAMINAR LATTICE STRUCTURES AND SURFACTANTS, THE IMPROVEMENT COMPRISING PREHEATING SAID WORKPIECE TO A TEMPERATURE BETWEEN 50* AND 150*C, EFFECTING A MOTION OF SAID WORKPIECES RELATIVE TO EACH OTHER SUFFICIENT TO CAUSE INTERCONTACT WHILE SIMULTANEOUSLY CONTACTING SAID WORKPIECES WITH SAID SUSPENSION HAVING ACTIVE CONTENT IN AN AMOUNT OF BETWEEN 5 AND 50 G/M2 OF WORKPIECE SURFACE AREA AND COMPRISING 5-50% OF A LAMINAR LATTICE COMPOUND, 0.5-14% H3PO4 AND 0.05-1% SURFACTANT, AND CONTINUING SAID MOTION UNTIL A PREDOMINANT PART OF THE WATER IS SAID SUSPENSION HAS BEEN EVAPORATED.
Claim 5
Dependent Claim
23 words
The method according to claim 1, wherein the evaporation of the water out of the tank is supported by an external heat source.
Claim 6
Dependent Claim
19 words
The method according to claim 1, wherein the aqueous suspension is fed into the moving tank at room temperature.
Claim 7
Dependent Claim
31 words
The method according to claim 1, wherein compressible bodies, for example made of polyethylene, polypropylene, polyamide, polymeric fluorinated hydrocarbons, rubber are added to the moving tank, in addition to the workpieces.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |