US3695076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacture of seamless tube
Assignee: Friedrich Kocks GmbH and Co
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Filing: 1970-11-27
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Granted: 1972-10-03
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Expires: 1990-11-27
Abstract
Abstract A method of manufacturing seamless tubing from a tubular bloom is provided in which the bloom is reduced on a mandrel or like rod in a first skew rolling mill inserted into the bloom, and the tube issuing from the first skew mill is immediately rolled in a continuous manner on a mandrel or like rod in a second skew mill directly contiguous to the first skew mill.
Inventors
- 👤 Friedrich Kocks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:51
CPC Classifications
B; B21; B21B; B21B19/00; B21B19/02; B21B19/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A method of manufacturing seamless tubing from a bloom comprising the steps of reducing the bloom to a first tube on one of a first mandrel rod and stopper rod inserted into the bloom in a first skew-rolling mill, transferring the end of the tube issuing from the first skew-rolling mill directly to one of a second mandrel rod and stopper rod coaxial with and separately spaced from said first mandrel and stopper rod and rotating at the same speed whereby the bloom and first tube are simultaneously rolled over a major portion of their length in a continuous process on said first and second mandrel rods and stopper rods in said first skew mill and in a second skew-rolling mill directly contiguous to the first skew-rolling mill and acting on the first tube on said one of a second mandrel rod and stopper rod to form said first tube into a second tube continuously and simultaneously with said first tube.
Claim 2
Independent Claim
161 words
A method of manufacturing seamless tubing from a bloom comprising the steps of reducing the bloom to a first tube on one of a first mandrel rod and stopper rod inserted into the bloom in a first skew-rolling mill, transferring the end of the tube issuing from the first skew-rolling mill directly to one of a second mandrel rod and stopper rod coaxial with and separately spaced from said first mandrel and stopper rod and rotating at the same speed whereby the bloom and first tube are simultaneously rolled over a major portion of their length in a continuous process on said first and second mandrel rods and stopper rods in said first skew mill and in a second skew-rolling mill directly contiguous to the first skew-rolling mill and acting on the first tube on said one of a second mandrel rod and stopper rod to form said first tube into a second tube continuously and simultaneously with said first tube.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1 in which the tube is subjected to tension between the first skew-rolling mill and the second skew-rolling mill.
Claim 4
Dependent Claim
90 words
A method as claimed in claim 1 in which the speed of rotation of the second mandrel rod or stopper rod and the tension in the tube between the first skew-rolling mill and the second skew-rolling mill are automatically controlled by varying one of the oblique setting of the rollers and the speed of rotation of the second skew-rolling mill in accordance with the speed of rotation of one of the first mandrel rod and stopper rod, and the axial movement of the rolled material between the two skew-rolling mills.
Claim 5
Dependent Claim
45 words
A method as claimed in claim 1 wherein the bloom is formed on an elongated piercing tool in a piercing press, and the piercing tool is left in the bloom after the piercing operation to serve as a mandrel rod in the first skew-rolling mill.
Claim 6
Dependent Claim
47 words
A method as claimed in claim 1 in which the tube, together with the second mandrel rod located in the interior of the tube, is transferred from the second skew-rolling mill to a third skew-rolling mill in which the tube is reduced on the second mandrel rod.
Claim 7
Dependent Claim
37 words
A method as claimed in claim 5 in which the tube coming from the third skew-rolling mill is simultaneously rolled on a further mandrel rod in a fourth skew-rolling mill directly contiguous to the third skew-rolling mill.
Claim 8
Dependent Claim
47 words
A method as claimed in claim 1 in which, after the first pass of the rolled material through the rolling line, the two skew-rolling mills are set to a smaller diameter and the rolled material is rolled back along the same path but in a reverse direction.
Claim 9
Dependent Claim
32 words
A method as claimed in claim 1 in which the rolled material is guided several times through the rolling line in the same direction with appropriate adjustment of the rollers between passes.
Claim 10
Dependent Claim
37 words
A method as claimed in claim 1 in which a solid ingot is formed into a hollow bloom in the first skew-rolling mill about the free end of a mandrel rod extending through the second skew-rolling mill.
Claim 11
Dependent Claim
17 words
A method as claimed in claim 1 in which the second skew-rolling mill comprises a three-roller stand.
References Cited (Backward Citations)
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US1088650A
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US1077013A
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US1499535A
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US1826360A
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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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |