Patent US3710840A successfully refreshed from Google Patents.
US3710840A
Expired / Lapsed
US
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Method for continuous casting of hollow bar
Assignee: TRULINE CASTING CO
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Filing: 1971-11-03
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Granted: 1973-01-16
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Expires: 1991-11-03
Abstract
Abstract A method of casting a hollow bar which includes a mold having a mandrel therein and means for distributing molten material to the mold inlet in an area between the mold and the mandrel. Initially a starting plug closes the mold outlet to prevent leakage of the molten material and provides means to join the plug and solidified melt. After the molten material freezes in the annulus around the mandrel, the starting plug is lowered at a controlled rate to draw the solidified hollow bar from the mold outlet as additional molten material is fed through the inlet. An air inlet into the hollow of the cast bar prevents the formation of a vacuum within the hollow. Further, means are provided for cooling the mold to quickly freeze the molten material as it is fed into the mold. The starting plug includes structure for locking itself to the cast bar.
Inventors
- 👤 A Fabens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:03
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/08; B22D11/006
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
154 words
A method of casting a hollow bar comprising, assembling a pin within a starting plug and moving the assembly to a position adjacent the outlet of an annular mold, mounting a tapered mandrel within the mold, said mandrel including a cavity opening toward said assembly, distributing molten metal into a mold inlet, said mold comprising a metallic jacket encompassing a graphite liner, mechanically locking the assembly to the molten metal by cooling the molten metal below its freezing point where it contacts a projecting obstruction on said assembly, the solidified metal providing a bearing shoulder for said obstruction, cooling the mold by circulating a cooling fluid through passages in the metallic jacket to freeze the molten metal as it passes through the mold while moving the assembly away from the mold outlet to draw the formed hollow bar from the mold as it freezes, and venting the interior of the hollow bar during casting.
Claim 2
Independent Claim
154 words
A method of casting a hollow bar comprising, assembling a pin within a starting plug and moving the assembly to a position adjacent the outlet of an annular mold, mounting a tapered mandrel within the mold, said mandrel including a cavity opening toward said assembly, distributing molten metal into a mold inlet, said mold comprising a metallic jacket encompassing a graphite liner, mechanically locking the assembly to the molten metal by cooling the molten metal below its freezing point where it contacts a projecting obstruction on said assembly, the solidified metal providing a bearing shoulder for said obstruction, cooling the mold by circulating a cooling fluid through passages in the metallic jacket to freeze the molten metal as it passes through the mold while moving the assembly away from the mold outlet to draw the formed hollow bar from the mold as it freezes, and venting the interior of the hollow bar during casting.
Claim 3
Dependent Claim
21 words
The method of claim 1 including drawing air into the cavity of said mandrel as the hollow bar is being withdrawn.
Claim 4
Dependent Claim
29 words
The method of claim 1 including drawing air into the cavity of said mandrel through a passage in the same as the frozen bar is withdrawn from the mold.
Claim 5
Dependent Claim
19 words
The method of claim 1 including cooling the hollow bar by fluid impingement after the bar leaves the mold.
Claim 6
Dependent Claim
19 words
The method of claim 2 including cooling the hollow bar by fluid impingement after the bar leaves the mold.
Claim 7
Dependent Claim
19 words
The method of claim 3 including cooling the hollow bar by fluid impingement after the bar leaves the mold.
Claim 8
Dependent Claim
17 words
The method of claim 1 including lubricating the interior surface of the mold during the casting process.
Claim 9
Dependent Claim
19 words
The method of claim 7 including cooling the hollow bar by fluid impingement after the bar leaves the mold.
Claim 10
Dependent Claim
20 words
The method of claim 7 including drawing air into the cavity in said mandrel through a passage in the same.
Claim 11
Dependent Claim
20 words
The method of claim 8 including drawing air into the cavity in said mandrel through a passage in the mandrel.
Claim 12
Dependent Claim
20 words
The method of claim 7 including drawing air into the cavity in said mandrel through an opening in said assembly.
Claim 13
Dependent Claim
20 words
The method of claim 8 including drawing air into the cavity in said mandrel through an opening in said assembly.
Claim 14
Dependent Claim
80 words
The method of claim 1 including removing the starting bar from the cast hollow bar by severing the cast bar into two pieces, said severing being in a plane not parallel to the axis of the cast bar, severing the portion of the cast bar containing the starting bar in a plane at least partially parallel with the axis of the cast bar, said last severing progressing to the outer surface of said pin at least at two spaced points.
Claim 15
Dependent Claim
33 words
The method of claim 1 including removing the starting bar from the cast hollow bar by rotating the starting bar to unthread the cast bar from a threaded cavity in the starting bar.
Claim 16
Dependent Claim
50 words
The method of claim 1 wherein the projecting obstruction comprises screws threaded through the wall of the cavity, removing the starting bar from the cast bar by retracting the screws from within the cavity and pulling the two bars apart by force having a component coxial with the cast bar.
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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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |