US3590622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making tubing
Assignee: Individual
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Filing: 1968-12-18
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Granted: 1971-07-06
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Expires: 1988-12-18
Abstract
Abstract A tube mill wherein skelp is formed to tube shape and welded along a longitudinal split. The tubing is cold-worked at several passes in a manner that the coarse grain structure at the weld area is refined without affecting the surfaces of reducing dies. Means are provided to effect reciprocation of the mandrel during cold-working operations. The invention comprises methods of forming and working tubing and includes the forming of a tube from skelp having thickened longitudinal portions and coldworking the welded area to refine the weld structure approximately to that of the remaining tube.
Inventors
- 👤 Frank E Elge
- 👤 Thomas G Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:45
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0807; B21C37/0811; B21B; B21B17/00; B21B17/02; B21B17/04; B23; B23K; B23K9/00; B23K9/02; B23K9/025; B23K9/0253
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
Apparatus for cold-working tubing on a mandrel, comprising a first pair of stands spaced longitudinally along the tubing for cold-working the tubing and thereby tightening the tubing on the mandrel, means for opening and closing said first pair of stands, in open position no cold-working being accomplished, a second pair of stands spaced from said first pair of stands in a downstream direction, one of said second stands being intermediate said first pair of stands, each of said second stands cold-working the tubing in a manner to free it from the mandrel, control means for opening each of said first stands when approximately a portion of tubing which has been cold-reduced by the leading first stand and reworked by the said intermediate second stand reaches the trailing first stand, means for retracting said mandrel through said tubing when second stand are opened, said control means closing said second stands when said mandrel has been retracted.
Claim 2
Dependent Claim
155 words
Apparatus for cold-working tubing on a mandrel, comprising a first pair of stands spaced longitudinally along the tubing for cold-working the tubing and thereby tightening the tubing on the mandrel, means for opening and closing said first pair of stands, in open position no cold-working being accomplished, a second pair of stands spaced from said first pair of stands in a downstream direction, one of said second stands being intermediate said first pair of stands, each of said second stands cold-working the tubing in a manner to free it from the mandrel, control means for opening each of said first stands when approximately a portion of tubing which has been cold-reduced by the leading first stand and reworked by the said intermediate second stand reaches the trailing first stand, means for retracting said mandrel through said tubing when second stand are opened, said control means closing said second stands when said mandrel has been retracted.
Claim 3
Dependent Claim
31 words
The construction according to claim 1 and further including a sinking die downstream of said second pair of stands through which the tubing is forcibly moved to reduce its outside diameter.
Claim 4
Dependent Claim
38 words
The construction according to claim 1 wherein said tubing is welded along a substantially rectilinear longitudinal split and wherein each of said pair of stands includes rolls which are contoured to concentrate cold-working forces at the weld line.
Claim 5
Dependent Claim
151 words
Apparatus for forming and cold working metal tubing, comprising forming means for forming metal skelp into tubular form with a substantially rectilinear longitudinal split, welding means downstream of said forming means for welding said tubing along said longitudinal split as the latter passes through said welding means, a mandrel within said welded tubing, and a die downstream of said welding means having die surfaces forming a pass through which said tubing is forcibly moved, said pass having an opening at the weld line so that said die surfaces cold-work and reduce the wall thickness of said tubing by its forcible movement between said die surfaces and said mandrel, except at said weld line, and a roller wheel having its outer periphery extending through said pass opening and pressed into engagement with the outer surface of the weld to cold-work the weld by its confinement between the roll periphery and said mandrel.
Claim 6
Dependent Claim
151 words
Apparatus for forming and cold working metal tubing, comprising forming means for forming metal skelp into tubular form with a substantially rectilinear longitudinal split, welding means downstream of said forming means for welding said tubing along said longitudinal split as the latter passes through said welding means, a mandrel within said welded tubing, and a die downstream of said welding means having die surfaces forming a pass through which said tubing is forcibly moved, said pass having an opening at the weld line so that said die surfaces cold-work and reduce the wall thickness of said tubing by its forcible movement between said die surfaces and said mandrel, except at said weld line, and a roller wheel having its outer periphery extending through said pass opening and pressed into engagement with the outer surface of the weld to cold-work the weld by its confinement between the roll periphery and said mandrel.
Claim 7
Dependent Claim
76 words
Apparatus according to claim 1, wherein said die comprises a pair of die sections, one section being fixed and the other movable toward and into abutment with said fixed section to form a pass, said die sections having complementary recessed portions and in abutting relation forming a complete pass except for the opeNing provided by said recessed portions, said opening being of a size to closely but freely accommodate the side surfaces of said roller wheel.
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |