GB959093A - Improvements in or relating to method and apparatus for combined stretch and die forming of metal stock - Google Patents
Improvements in or relating to method and apparatus for combined stretch and die forming of metal stockInfo
- Publication number
- GB959093A GB959093A GB39779/60A GB3977960A GB959093A GB 959093 A GB959093 A GB 959093A GB 39779/60 A GB39779/60 A GB 39779/60A GB 3977960 A GB3977960 A GB 3977960A GB 959093 A GB959093 A GB 959093A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stock
- dies
- die
- pressure
- tensioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
- B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die
Abstract
959,093. Stretch forming. CYRIL BATH CO. Nov. 18, 1960 [March 17, 1960], No. 39779/60 Headings B3E and B3Q. A method of cold forming sheet metal stock into an article, e.g. automobile panels, comprises tensioning the stock along only one dimension into a range above its elastic limit, and drawing the stock into the desired shape to form the article between drawing dies substantially coextensive peripherally with that area of the stock from which the article is to be formed to change the cross-sectional shape of the stock in each of two cross-sectional planes mutually perpendicular to each other and to the stock. A machine for carrying out the method comprises a main framework 1, 2 and 3, the top frame 3 supporting a male drawing die 4. A complementary female die 5 is mounted on a rocker arm 7 pivoted at one end to the main frame at 8. The rocker arm is actuated by hydraulic cylinders 12 pivoted to the main frame. The sheet metal stock is gripped at the end of the machine adjacent the pivot 8 by grippers 21 detachably and adjustably mounted on a pivoted head 20. All the grippers are opened and closed simultaneously by fluid pressure means. Alternatively, a single elongated gripper is used. At the other end of the machine a complementary pivoted gripping head 40 carries grippers 41 and the tensioning of the sheet metal stock is effected by a fluid pressure cylinder 45 pivotally mounted in a frame 49 on rocker arms 50. After the initial tensioning of the stock the head 40 is swung downwardly to stretch form the stock over the die 4. This is effected by a fluid pressure cylinder 52 attached to the rocker arms 50. In operation, with the arm 7 in its raised position, the sheet metal stock is gripped by the heads 20 and 40 and fluid pressure is supplied to the cylinder 45 to tension the stock beyond its elastic limit. Fluid pressure is next supplied to the cylinders 12 to close the dies. Due to the gradual closure of the dies progressively from one edge to the other edge in the stretch forming dimension the metal tends to flow in the direction of closure. At the same time the metal is free and unconstrained and unconfined at the die edges which extend in the tensioning direction so that the metal creeps into the dies freely transversely of the tensioning direction and can flow in the tensioning direction as urged so by the die faces and the tensioning means and so readily takes the form of the dies without wrinkling. While the dies are held closed the stock may be given an additional restretch to set the material around the margins. A modified machine, Fig. 10, comprises a frame 70 on which is mounted a male die 71 and a female die 72, both dies being connected together at one edge by a pivot 73. Stretch-forming means 75 is actuated by a fluid-pressure cylinder 78. The die 72 is opened and closed by fluidpressure cylinders 83 and a pressure roll 86 urged downwardly by fluid-pressure cylinders 87 acts on the die 72 to supply the required forming pressure to the dies. The supports 85 for the pressure roll 86 are movable lengthwise of the dies on guideways 89 by fluid-pressure cylinders 90 so that the roll is transversed across the dies at the same time as the forming pressure is applied. In a modification the female dies 94, Fig. 12, is carried on the bed of the machine and the male die 95 is mounted on the pivoted rocker arm. Specification 959,094 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15588A US2961028A (en) | 1960-03-17 | 1960-03-17 | Method and apparatus for combined stretch and die forming of metal stock |
Publications (1)
Publication Number | Publication Date |
---|---|
GB959093A true GB959093A (en) | 1964-05-27 |
Family
ID=21772314
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB45984/63A Expired GB959094A (en) | 1960-03-17 | 1960-11-18 | Improvements in or relating to method and apparatus for combined stretch and die forming metal stock |
GB39779/60A Expired GB959093A (en) | 1960-03-17 | 1960-11-18 | Improvements in or relating to method and apparatus for combined stretch and die forming of metal stock |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB45984/63A Expired GB959094A (en) | 1960-03-17 | 1960-11-18 | Improvements in or relating to method and apparatus for combined stretch and die forming metal stock |
Country Status (5)
Country | Link |
---|---|
US (1) | US2961028A (en) |
BE (1) | BE597299A (en) |
CH (1) | CH382094A (en) |
DE (1) | DE1402806A1 (en) |
GB (2) | GB959094A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4432222A (en) * | 1981-02-13 | 1984-02-21 | Nissan Motor Company, Limited | Stretch drawing apparatus |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3152383A (en) * | 1960-06-29 | 1964-10-13 | United States Steel Corp | Production of flat metal sheets |
US3296852A (en) * | 1963-11-29 | 1967-01-10 | Western Electric Co | Metal forming press |
US3224241A (en) * | 1964-02-28 | 1965-12-21 | Cyril Bath Co | Underreach prestretch fixture and combination thereof with drawing die press |
US3236086A (en) * | 1964-04-09 | 1966-02-22 | United States Steel Corp | Production of flat metal sheets |
US3299688A (en) * | 1964-06-15 | 1967-01-24 | Landon R Gray | Sheet metal stretch forming apparatus and method |
US3416350A (en) * | 1966-02-23 | 1968-12-17 | Martin Marietta Corp | Gripping structure |
US3440856A (en) * | 1967-04-25 | 1969-04-29 | Baldwin Lima Hamilton Corp | Gripping device with variable wedge angle |
US3597955A (en) * | 1969-01-13 | 1971-08-10 | Cyril Bath Co | Apparatus for stretch drawing sheet stock under controlled tension |
US4413500A (en) * | 1979-12-26 | 1983-11-08 | Hughes Aircraft Company | Tool for forming precisely curved surfaces |
US4627256A (en) * | 1979-12-26 | 1986-12-09 | Hughes Aircraft Company | Method of forming precisely curved surfaces |
US4747292A (en) * | 1986-05-28 | 1988-05-31 | Chorneau Frederick R | Stretch forming apparatus |
US4698995A (en) * | 1986-05-28 | 1987-10-13 | Chorneau Frederick R | Method for stretch forming drop hammer parts utilizing stretch wrap forming techniques |
GB8719495D0 (en) * | 1987-08-18 | 1987-09-23 | Abbeybench Ltd | Forming parts from ductile materials |
DE4213490C1 (en) * | 1992-04-24 | 1993-09-30 | Deutsche Aerospace Airbus | Composite shaping body for stretch-forming machine - has supporting heads with similarly-curving surfaces tilting in all directions on jacks for elastic cover accommodating metal sheet |
US5606886A (en) * | 1995-01-18 | 1997-03-04 | Polen; Larry A. | Jaw assembly for stretch former |
DE69806971T2 (en) * | 1997-09-18 | 2003-08-07 | Cosma Int Inc | DRAWING AND DRAWING TOOL AND RELATED PROCEDURE |
US5910183A (en) * | 1998-01-09 | 1999-06-08 | Gec Alsthom Cyril Bath | Stretch-forming machine with servo-controlled curving jaws |
US6508096B1 (en) * | 2000-07-14 | 2003-01-21 | Versaform Corp. | Process for drawing and stretching sheet metal |
US6910358B2 (en) * | 2003-08-25 | 2005-06-28 | General Motors Corporation | Two temperature two stage forming |
EP2664446B1 (en) * | 2012-05-16 | 2015-04-29 | Airbus Operations GmbH | Method for manufacturing a lining element, a lining element and a vehicle comprising a cabin and at least one such lining element |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2619149A (en) * | 1949-05-31 | 1952-11-25 | North American Aviation Inc | Method of joggling |
US2850071A (en) * | 1954-10-18 | 1958-09-02 | Daniel W Kraybill | Method and apparatus for stretchforming metal and controlling direction of pull |
US2850070A (en) * | 1955-01-12 | 1958-09-02 | Ind Res Lab | Machine to bend metal weatherboard over insulation sheathing |
-
1960
- 1960-03-17 US US15588A patent/US2961028A/en not_active Expired - Lifetime
- 1960-11-18 GB GB45984/63A patent/GB959094A/en not_active Expired
- 1960-11-18 GB GB39779/60A patent/GB959093A/en not_active Expired
- 1960-11-21 CH CH1303160A patent/CH382094A/en unknown
- 1960-11-21 BE BE597299A patent/BE597299A/en unknown
- 1960-11-21 DE DE19601402806 patent/DE1402806A1/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4432222A (en) * | 1981-02-13 | 1984-02-21 | Nissan Motor Company, Limited | Stretch drawing apparatus |
Also Published As
Publication number | Publication date |
---|---|
BE597299A (en) | 1961-03-15 |
CH382094A (en) | 1964-09-30 |
DE1402806A1 (en) | 1969-11-06 |
US2961028A (en) | 1960-11-22 |
GB959094A (en) | 1964-05-27 |
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