US3765215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube drawing method and apparatus
Assignee: Alcoa Corp
•
Filing: 1972-01-21
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Granted: 1973-10-16
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Expires: 1992-01-21
Abstract
Abstract A method and apparatus for drawing tubular stock continuously and simultaneously through at least two successive drawing dies having mandrels located in the dies and within the tubular stock. The method comprises the steps of continuously pulling the tubular stock through the first one of the dies by a rotating capstan containing turns of the stock, the capstan simultaneously directing the stock to the second of one of the dies. From the second die, the stock is continuously pulled, the pulling of the stock continuously through the dies effecting a simultaneous reduction of the cross sectional area of the stock, with a single pass of the stock through the dies.
Inventors
- 👤 G Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:17
CPC Classifications
B; B21; B21C; B21C1/00; B21C1/02; B21C1/04; B21C1/16; B21C1/22; B21C1/24
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
96 words
A method of drawing tubular stock simultaneously through at least two successive drawing dies, the method comprising the steps of pulling the tubular stock through the first one of said dies by rotating a pulling member capable of winding the tubular stock thereon at a location intermediate of said dies while simultaneously directing the tubular stock to the second one of said dies from said pulling member, and simultaneously, continuously pulling said tubular stock through the second one of said dies, said dies simultaneously reducing the cross sectional area of the tubular stock being pulled therethrough.
Claim 2
Independent Claim
96 words
A method of drawing tubular stock simultaneously through at least two successive drawing dies, the method comprising the steps of pulling the tubular stock through the first one of said dies by rotating a pulling member capable of winding the tubular stock thereon at a location intermediate of said dies while simultaneously directing the tubular stock to the second one of said dies from said pulling member, and simultaneously, continuously pulling said tubular stock through the second one of said dies, said dies simultaneously reducing the cross sectional area of the tubular stock being pulled therethrough.
Claim 3
Dependent Claim
28 words
The method of claim 1 in which at least one of the drawing dies is operative with a mandrel located therein and within the tubular stock being drawn.
Claim 4
Dependent Claim
15 words
inserting and temporarily fixing a mandrel in said tubular stock adjacent the free end thereof,
Claim 5
Dependent Claim
15 words
inserting and temporarily fixing a mandrel in said tubular stock adjacent the free end thereof,
Claim 6
Dependent Claim
23 words
reducing the free end of the tubular stock substantially to the size of an orifice of a die secured in a die holder,
Claim 7
Dependent Claim
23 words
reducing the free end of the tubular stock substantially to the size of an orifice of a die secured in a die holder,
Claim 8
Dependent Claim
51 words
The method of claim 1 in which the first pulling step includes rotating the pulling member at a rate of speed greater than the rate at which the tubular stock is pulled from the first die to cause the pulling member to slip within at least one turn of tubular stock.
Claim 9
Dependent Claim
43 words
The method of claim 3 including the step of continuously winding the tubular stock being pulled from the second die onto a second pulling member at an angle different from the angle at which the stock was directed from the first pulling member.
Claim 10
Dependent Claim
9 words
directing the reduced end into and through the orifice,
Claim 11
Dependent Claim
9 words
directing the reduced end into and through the orifice,
Claim 12
Dependent Claim
23 words
pulling the tubular stock from the orifice and around a pulling member to provide a first group of loops of the tubular stock,
Claim 13
Dependent Claim
23 words
pulling the tubular stock from the orifice and around a pulling member to provide a first group of loops of the tubular stock,
Claim 14
Dependent Claim
137 words
Apparatus for performing simultaneous drawing operations on tubular stock in a single pass of the stock through the apparatus, comprising at least two successive drawing dies and mandrels disposed in the orifices of the dies, and located within the tubular stock, a rotatable pulling member located intermediate of said dies for continuously pulling tubular stock through the first one of said dies and for directing the tubular stock from the pulling member to the second one of said dies, said pulling member having wound thereon at least one turn of said stock, a rotatable second pulling member for simultaneously and continuously pulling the tubular stock through the second one of said dies, said dies in cooperation with their respective mandrels being adapted to effect simultaneous reduction of the cross sectional area of the tubular stock pulled therethrough.
Claim 15
Dependent Claim
137 words
Apparatus for performing simultaneous drawing operations on tubular stock in a single pass of the stock through the apparatus, comprising at least two successive drawing dies and mandrels disposed in the orifices of the dies, and located within the tubular stock, a rotatable pulling member located intermediate of said dies for continuously pulling tubular stock through the first one of said dies and for directing the tubular stock from the pulling member to the second one of said dies, said pulling member having wound thereon at least one turn of said stock, a rotatable second pulling member for simultaneously and continuously pulling the tubular stock through the second one of said dies, said dies in cooperation with their respective mandrels being adapted to effect simultaneous reduction of the cross sectional area of the tubular stock pulled therethrough.
Claim 16
Dependent Claim
41 words
The apparatus of claim 5 in which the mandrel in the first one of the dies is provided with an opening extending longitudinally therethrough, said opening being adapted to pass lubricant therethrough when the tubular stock is drawn through the dies.
Claim 17
Dependent Claim
37 words
pulling the free end of the tubular stock from the pulling member for a distance sufficient to provide a volume of tubular stock capable of extending through the dies and around the capstans of the drawing apparatus,
Claim 18
Dependent Claim
37 words
pulling the free end of the tubular stock from the pulling member for a distance sufficient to provide a volume of tubular stock capable of extending through the dies and around the capstans of the drawing apparatus,
Claim 19
Dependent Claim
19 words
removing the group of loops of tubular stock from the pulling member, and the die from the die holder,
Claim 20
Dependent Claim
19 words
removing the group of loops of tubular stock from the pulling member, and the die from the die holder,
Claim 21
Dependent Claim
93 words
Apparatus for performing simultaneous multiple drawing operations with a single pass of tubular stock through the apparatus, comprising a plurality of successive drawing dies and die associated mandrels operative with at least a portion of said dies, a plurality of capstans mounted for rotation and alternately arranged with said dies, and means for rotating the capstans, with each capstan being capable of pulling the tubular stock through the die immediately preceding it and onto itself when rotated while simultaneously directing the tubular stock from the capstan to the die immediately succeeding the capstan.
Claim 22
Dependent Claim
93 words
Apparatus for performing simultaneous multiple drawing operations with a single pass of tubular stock through the apparatus, comprising a plurality of successive drawing dies and die associated mandrels operative with at least a portion of said dies, a plurality of capstans mounted for rotation and alternately arranged with said dies, and means for rotating the capstans, with each capstan being capable of pulling the tubular stock through the die immediately preceding it and onto itself when rotated while simultaneously directing the tubular stock from the capstan to the die immediately succeeding the capstan.
Claim 23
Independent Claim
156 words
A method of threading tubular stock through the orifices of successive drawing dies, at least a portion of which is operative with mandrels located in the die orifices and within the tubular stock, the method comprising the steps of inserting and temporarily fixing a mandrel in a free end of a length of tubular stock to be drawn, reducing the diameter of the free end of said tubular stock substantially to the size of the orifice of the first die of said successive drawing dies, directing the reduced end of said tubular stock through said orifice and onto a capstan, rotating the capstan to pull said tubular stock through the die and onto the capstan to provide at least one complete turn of the stock on the capstan, severing the reduced end of said tubular stock from the remainder thereof, and repeating the above steps with each of the remaining successive dies operative with a mandrel.
Claim 24
Independent Claim
156 words
A method of threading tubular stock through the orifices of successive drawing dies, at least a portion of which is operative with mandrels located in the die orifices and within the tubular stock, the method comprising the steps of inserting and temporarily fixing a mandrel in a free end of a length of tubular stock to be drawn, reducing the diameter of the free end of said tubular stock substantially to the size of the orifice of the first die of said successive drawing dies, directing the reduced end of said tubular stock through said orifice and onto a capstan, rotating the capstan to pull said tubular stock through the die and onto the capstan to provide at least one complete turn of the stock on the capstan, severing the reduced end of said tubular stock from the remainder thereof, and repeating the above steps with each of the remaining successive dies operative with a mandrel.
Claim 25
Dependent Claim
10 words
disposing the group of loops on a movable suspension means,
Claim 26
Dependent Claim
10 words
disposing the group of loops on a movable suspension means,
Claim 27
Dependent Claim
15 words
returning the free end of the tubular stock to a location adjacent the die holder,
Claim 28
Dependent Claim
15 words
returning the free end of the tubular stock to a location adjacent the die holder,
Claim 29
Dependent Claim
28 words
The method of claim 8 including the step of disposing a lubricant in the free end of the tubular stock before the mandrel is inserted in the stock.
Claim 30
Independent Claim
27 words
A method of prestringing tubular stock for a tube drawing apparatus having a plurality of alternately disposed successive dies and capstans, the method comprising the steps of
Claim 31
Independent Claim
27 words
A method of prestringing tubular stock for a tube drawing apparatus having a plurality of alternately disposed successive dies and capstans, the method comprising the steps of
Claim 32
Dependent Claim
7 words
disposing a die in the die holder,
Claim 33
Dependent Claim
7 words
disposing a die in the die holder,
Claim 34
Dependent Claim
32 words
repeating steps one to five, seven, eight and 10 to provide spaced groups of loops of the tubular stock, with dies attached to the stock at locations intermediate of the loop groups,
Claim 35
Dependent Claim
32 words
repeating steps one to five, seven, eight and 10 to provide spaced groups of loops of the tubular stock, with dies attached to the stock at locations intermediate of the loop groups,
Claim 36
Dependent Claim
33 words
moving the suspension means from the prestringing apparatus to the tube drawing apparatus to thereby present the groups of loops and dies to corresponding capstans and die holders of the drawing apparatus, and
Claim 37
Dependent Claim
33 words
moving the suspension means from the prestringing apparatus to the tube drawing apparatus to thereby present the groups of loops and dies to corresponding capstans and die holders of the drawing apparatus, and
Claim 38
Dependent Claim
21 words
placing the groups of loops on the corresponding capstans, and the dies in the corresponding die holders of the drawing apparatus.
Claim 39
Dependent Claim
21 words
placing the groups of loops on the corresponding capstans, and the dies in the corresponding die holders of the drawing apparatus.
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |