US3817076A - Apparatus for and method of drawing a cup-shaped article - Google Patents

Apparatus for and method of drawing a cup-shaped article Download PDF

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Publication number
US3817076A
US3817076A US00356964A US35696473A US3817076A US 3817076 A US3817076 A US 3817076A US 00356964 A US00356964 A US 00356964A US 35696473 A US35696473 A US 35696473A US 3817076 A US3817076 A US 3817076A
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United States
Prior art keywords
fluid
blank
die
die structure
set forth
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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 - Lifetime
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US00356964A
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English (en)
Inventor
J Wallace
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reynolds Metals Co
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Reynolds Metals Co
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Filing date
Publication date
Application filed by Reynolds Metals Co filed Critical Reynolds Metals Co
Priority to US00356964A priority Critical patent/US3817076A/en
Priority to CA195,241A priority patent/CA1003702A/en
Priority to GB1775774A priority patent/GB1442066A/en
Priority to AU68224/74A priority patent/AU463165B2/en
Priority to JP4962274A priority patent/JPS5315826B2/ja
Priority to DE2421218A priority patent/DE2421218A1/de
Priority to FR7415432A priority patent/FR2227910B1/fr
Application granted granted Critical
Publication of US3817076A publication Critical patent/US3817076A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • ABSTRACT An apparatus for and method of drawing a cup shaped article from a flat sheet blank wherein the apparatus comprises a first die structure having a die cavity therein and having a first drawing surface and a second die structure having a die center adapted to be received within the die cavity and having a pressure pad assembly provided as a part of the second die structure and such assembly comprises a plurality of concentric drawing surfaces which include an outer drawing surface and an inner drawing surface, with the outer and inner drawing surfaces being relatively axially movable.
  • the apparatus has means causing relative movement in an axial direction between the die structures to draw the sheet blank between the first drawing surface and the concentric drawing surfaces and fluid cushion means assures the entire blank may be drawn without pinching and the forming of knifelike edges in its peripheral edge portion.
  • This invention provides an improved apparatus for and method of drawing a cup-shaped article from a flat sheet metal blank which avoids the above-mentioned problems of prior art apparatus and methods and results in a cup-shaped article of comparatively high quality.
  • the apparatus comprises a first die structure having a die cavity therein and having a first drawing surface and a second die structure having a die center adapted to be received within the die cavity and having a pressure (pad assembly provided as a part of the second die structure and such assembly comprises a plurality of concentric drawing surfaces which include an outer drawing surface and an inner drawing surface, with the outer and inner drawing surfaces being relatively axially movable.
  • the apparatus has means causing relative movement in an axial direction between the die structures to draw the sheet blank between the first drawing surface and the concentric drawing surfaces and fluid cushion means for the pressure pad assembly assures the drawn blank is free of knife-like edges in its peripheral edge portion.
  • FIG. 1 is a view with parts in cross section, parts in elevation, and parts broken away illustrating an exemplary apparatus and method for drawing cup-shaped articles from a sheet blank and illustrating sheet stock 'moved in position prior to blanking or cutting a circular blank from such sheet stock;
  • FIG. 2 is a perspective view of a cup-shaped article made by the apparatus and method of FIG. 1;
  • FIG. 3 is a fragmentary cross-sectional view drawn to a greatly enlarged scale particularly illustrating inner and outer draw rings comprising the pressure pad of the apparatus of FIG. I at the beginning of a drawing apparatus;
  • FIG: 4 is a view with parts in cross section, parts in elevation, and parts broken away drawn to an enlarged scale of a first die structure and a. second die structure of the apparatus of FIG. 1 and particularly illustrating the positions of inner and outer dlraw rings-comprising the pressure pad of thesecond die structure at the beginning of a drawing operation;
  • FIG.5 is a view similar to FIG. 4 particularly illustrating the relative axial positions of the inner and outer draw rings once the peripheral edge portion of a blank being drawn is moved out of engagement with the drawing surface of the outer draw ring;
  • FIG. 6 is a view similar to FIG. 4 particularly illustrating the drawing operation with only the peripheral-edge portion of the blank remaining to be drawn.
  • FIG. 1 of the drawings illustrates one exemplary embodiment of the apparatus and method of this invention which is designated generally by the reference numeral 10 and is particularly adapted to draw a cup-shaped article in the form of a cup 11 which is illustrated in FIG. 2.
  • the cup 11 has a substantially planar bottom wall 12 adjoined by a right circular cylindrical side wall 13 definedas an integral part thereof and the cylindrical side wall 13 has a substantially planar top circular edge 14 which has a substantially full thickness and is free of knife-like edges, or the like.
  • the apparatus 10 may be supplied with metal sheet stock 15 from any suitable supply source and the stock 15 may 'be suitably moved in position preferably in an indexing manner as illustrated at 16 between a first or upper die structure 20 of the apparatus 10 and a lower die structure 21 of such apparatus and cut to define a flat circular blank or workpiece which is designated generally by the reference numeral 22 in FIGS. 4, 5, and 6 of the drawings.
  • the die structure 20 has a circular cutting edge 23 which is particularly adapted to cooperate with an inner cutting edge 24provided on a cutting ring 25 which is fixed to the die structure 21 and the cutting edges 23 and 24 cooperate once the die structures20 and 21 are relatively moved together to seve'rthe circular blank 22.
  • the die structure20 may be provided with a stripper ring (not shown) for stripping the sheet stock 15 from around the die structure 20 in the event such sheet stock clings thereto.
  • the workpiece 22 is drawn in accordance with the teachings of this invention utilizing the apparatus and method of this invention to define the previously described cup shaped article or cup 11.
  • the die structure 20 has a die cavity 26 provided therein and an annular planar drawing surface 27 which is adjoined by an annular surface of arcuate configuration 30 leading into the die cavity 26.
  • the die structure 21 is suitably supported at a fixed position by a supporting structure or support 31 and the die structure 21 has a die center 32 which is particularly adapted to be received within the die cavity 26 during the process of drawing the blank 22 between the die structures 20 and 21.
  • the die structure 21 also has a pressure pad assembly which is designated generally by the reference numeral 35 and such pressure pad assembly comprises an outer draw ring 36 and an inner draw ring 37.
  • the outer draw ring 36 has an outer annular substantially planar drawing surface 41, see FIG. 3, and the inner draw ring 37 has an inner substantially planar drawing surface 42 whereby the drawing surfaces 41 and 42 are in essence concentric drawing surfaces which are arranged substantially coplanar.
  • the draw rings 36 and 37 are relatively axially movable and in this example are movable along a vertical central axis 43 for the entire apparatus 10, see FIG. 4, whereby the outer and inner drawing surfaces 41 and 42 respectively are also relatively axially movable.
  • the apparatus has suitable means, or a device 44, causing or providing relative movement in an axial direction between the die structures and 21 and such means or device 44 is shown schematically as a double arrow in FIG. 1. Because in this example of the invention the die structure 21 is shown as being supported in a fixed position by the support 31 such relative movement is provided by movement of only the die structure 20 using device 44 which may be in the form of an actuator, the ram of a press of known construction, or the like. Thus, upon relatively moving the die structures 20 and 21 along the axis 43 by utilizing the moving means 44 to move the die structure 20, the blank 22 is drawn between the die structures 20 and 21 to define the cup 11 and as will be readily apparent from the following description presented in connection with FIGS. 3-6.
  • the apparatus 10 has fluid cushion means which is designated generally by the reference numeral 45 and is preferably in the form of fluid cushion means for the pressure pad assembly 35.
  • the cushion means 45 operates to hold the rings 36 and 37 and hence their respective concentric drawing surfaces 41 and 42 against the bottom surface of the blank 22 at the beginning of the drawing action on the blank and as illustrated particularly in FIG. 4.
  • the fluid cushion means 45 then allows relative movement in an axial direction between the inner and outer concentric drawing surfaces 42 and 41 respectively once the peripheral edge portion 47 of the blank 22 has moved out of engagement with the outer drawing surface 41.
  • the fluid cushion means 45 allows relative axial movement of drawing surfaces 41 and 42 so that the distance indicated at 46, in FIG.
  • the outer draw ring 36 comprises a substantially L-shaped ring having a vertical leg portion 52 and a horizontal leg portion 53 and the outer annular drawing surface 41 defines the top horizontal surface of the vertical leg portion 52.
  • the horizontal leg portion 53 has a stepped surface which includes a raised substantially horizontally extending surface portion 58.
  • the inner draw ring 37 has a main portion 55 provided with a bottom surface 56 which is adapted to be supported on the raised surface portion 58 of the stepped surface 54 and the ring 37 has a downwardly extending vertical extension 57 defined as an integral part of the main body portion 55.
  • the portion 57 has a vertical surface 60 which is arranged adjacent a vertical surface 61 which adjoins the raised surface portion 58 of the horizontal leg portion 53 and surface 60 is adapted to move or slide vertically relative to surface 61.
  • the main body portion 55 of the inner ring 37 also has a vertical surface 62 which is adapted to slide vertically relative to an inside surface 63 of the vertically ex tending leg portion 52 of the outer ring 36.
  • Fluid seal means is provided between the rings 36 and 37 so as to define a fluid pressure chamber 70 therebetween.
  • seal means comprises a fluid tight annular seal 64 provided between the surfaces 60 and 61 and a fluid-tight annular seal 65 provided between the surfaces 62 and 63 and the arrangement of the rings 36 and 37 and the seals 64 and 65 is such that the fluid pressure chamber 70 is provided be tween the draw rings 36 and 37 and the purpose of the chamber 70 will be explained subsequently.
  • the fluid cushion means 45 includes a fluid operated tubular cylinder 71 which supports the outer draw ring 36 and hence in essence supports both draw rings 36 and 37.
  • a fluid under pressure is provided in a chamber 72 in the lower portion of the die structure 21 and such pressurized fluid operatively associates with the cylinder 71 to provide the desired movement of the rings 36 and 37 during the drawing operation.
  • the fluid cushion means 45 has orifice means indicated in the form of an orifice 74, see FIGS. 3 and 4, which extends through the horizontal leg portion 53 of the draw ring 36 and is used to introduce fluid under pressure into the pressure chamber 70 and to remove fluid under pressure from within such chamber.
  • the tubular cylinder 71 also has a passage 76 extending axially along its length and the passage 76 has an upper portion in the form of a bore 77 in the wall of the cylinder and a passage portion 78 defined by a groove in the lower portion of the cylinder and an adjoining sleeve 79.
  • the fluid in chamber 70 is in flow communication with the fluid in chamber 72 via the passage 76.
  • the die structure 21 also has other suitable seal means or seals, shown in FIG. 1 yet not described in detail, to assure satisfactory operation of the fluid cushion means including the cylinder 71.
  • the orifice 74 allows fluid in the chamber to be expelled therethrough and through the passage 76 to allow relative movement between the rings 36 and 37 from the position of FIG. 4 to the position of FIG. 5.
  • the oriflce 74 serves to delay the rapid introduction of the fluid into the chamber 70. This delay is sufficient to allow portion 47 to be drawn and the cup 11 completed whereby there is no tendancy to pinch and thus form knife-like edges in the peripheral edge portion 47. Accordingly, the cup 11 has a planar substantially full thickness circular edge 14 defining the top of its side wall 13.
  • the chamber 72 may be provided with a suitable fluid which may be in the form of a gas such as air under pressure or in the form of a liquid such as oil, or the like, in accordance with techniques known in the art.
  • the fluid in the chamber 72 may be supplied thereto and removed therefrom through appropriate fittings 80 and 81 as shown in FIG. 1 and in accordance with techniques known in the art. Further, such fluid may be provided from any suitable supply source for such fluid and any means known in the art may be employed to keep such fluid under a predetermined controlled pressure.
  • a workpiece or blank 22 is placed between associated die structures and 21 of apparatus 10 and the die structure 20 has the die cavity 26 therein and a planar annular drawing surface 27 while the die structure 21 has a plurality of concentric drawing surfaces including an outer drawing surface 41. and an inner drawing surface 42.
  • the drawing surfaces 41 and 42 are relatively axially movable along axis 43 of apparatus 10 due to the fact that the associated pressure pad rings 36 and 37 with draw surfaces 41 and 42 respectively thereon are relatively axially movable along such axis.
  • the die structures 20 and 21 are then relatively axially moved; and, in this example because the die structure 21 is held in a stationary position by the support 31 moving means in the form of a moving device 44 is employed to move the die structure 20 relative to the die structure 21.
  • the pressure pad draw rings 36 and 37 and hence their respective drawing surfaces 41 and 42 are supported by fluid cushion means 45.
  • the fluid cushion means 45 allows relative movement in the axial direction between the outer and inner surfaces 41 and 42 respectively once the peripheral edge portion of the blank has moved out of engagement with the outer drawing surface 41 and in particular, it will be seen that the axial movement takes place so that the inner draw ring 37 moves a distance 46 illustrated in FIG. 3.
  • fluid present in the fluid pressure chamber 70 is subjected to full drawing pressure whereby it is forced out of the chamber 70 through orifice 74 to reduce the volume thereof from the volume illustrated in FIG. 4 to the comparatively small volume illustrated in FIGS. 5 and 6.
  • the fluid from the pressure chamber 70 is expelled through the orifice 74, passage 76, and into chamber 72.
  • the inner ring 37 is, in essence, a floating ring and in order for it to be urged outwardly, fluid must travel through the passage 76 and orifice 74 into the chamber causing relative movement of the inner ring 37 from the position of FIG. 6 to the position of FIG. 4.
  • the orifice 74 serves to control any tendancy for a rapid entry of fluid under pressure into the chamber 70 and such orifice serves as a builtin delay in the movement of ring 37. The delay is sufficient that with continued drawing movement of the die structure 20 the peripheral portion 47 is drawn and the cup 11 is completed so that it has its cylindrical side wall 13 free of knife-like edges, or the like.
  • any suitable valve means may be provided instead of the orifice 74 for introduc ing a delay in the build up of pressure in chamber 70.
  • the area of such orifice is precisely controlled depending upon the operating characteristics of the overall apparatus 10 to introduce the desired delay into the application of substantial pressure against the inner ring 37 and hence prevent the above described pinching action.
  • the apparatus and method of this invention employs a pressure pad which has a plurality of concentric drawing surfaces including an outer drawing surface and an inner drawing surface and the outer and inner drawing surfaces are relatively axially movable in a controlled manner utilizing fluid cushion means so that once a cup-shaped article is drawn using a flat sheet blank made of metal, or the like, the peripheral edge portion of the blank may be easily drawn without pinching and hence without the forming of knife-like edges therein in a manner heretofore unknown.
  • the apparatus and method of this invention may be utilized to draw cup-shaped articles from a sheet blank made of any suitable metal; however, the apparatus and method of this invention has been especially effective in drawing sheet-like blanks of metallic materials containing aluminum.
  • An apparatus for drawing a cup-shaped article from a sheet blank comprising; a first die structure having a die cavity therein and having a first drawing surface; a second die structure having a die center adapted to be received within said die cavity; a pressure pad comprising said second die structure; said pressure pad having a plurality of concentric drawing surfaces and including an outer drawing surface and an inner drawing surface; said outer and inner drawing surfaces being relatively axially movable; means causing relative movement in an axial direction between said die structures to draw said sheet blank between said first drawing surface and said concentric drawing surfaces; and fluid cushion means for said pressure pad; said fluid cushion means holding said plurality of concentric drawing surfaces against said blank at the beginning of the drawing action on said blank, allowing relative movement in said axial direction between said inner and outer surfaces once the peripheral edge portion of said blank has moved out of engagement with said outer drawing surface, and controlling said inner drawing surface once the peripheral edge portion of said blank remains to be drawn to prevent pinching and forming of a knife edge in said peripheral edge portion; said pressure pad comprising an outer draw
  • said outer draw ring comprises a substantially L-shaped ring having a vertical leg portion and a horizontal leg portion and said outer drawing surface comprises a top horizontal surface of said vertical leg portion.
  • said means for introducing and removing said fluid comprises an orifice extending through said horizontal leg portion of said outer draw ring and communicating with said fluid under pressure.
  • said fluid cushion means further comprises a fluid operated cylinder supporting said outer draw ring and hence both of said draw rings, said fluid operated cylinder having passage means therein, said passage means having one end communicating with said fluid under pressure and its opposite end communicating with said orifice.
  • a method of drawing a cup-shaped article comprising the steps of; placing a sheet blank between a first die structure having a die cavity therein and having a first drawing surface and a second die structure having a die center adapted to be received within said cavity; said second die structure comprising a pressure pad which has an outer draw ring provided with an outer drawing surface and an inner draw ring provided with an inner drawing surface with said outer and inner rings and their drawing surfaces being relatively axially movable; relatively moving said die structures in an axial direction to draw said sheet blank between said drawing surfaces; supporting said pressure pad with fluid cushion means during said step of relatively moving; said fluid cushion means holding said inner and outer drawing surfaces against said blank at the beginning of the drawing action on said blank, allowing relative movement in said axial direction between said inner and outer surfaces once the peripheral edge portion of said blank has moved out of engagement with said outer drawing surface, and controlling said inner drawing surface once the peripheral edge portion of said blank remains to be drawn to prevent pinching and forming of a knife edge in said peripheral edge portion; said step of supporting said pressure pad with fluid
  • said supporting step comprises supporting said draw rings with said fluid cushion means including a fluid operated cylinder which supports said outer draw ring and hence both of said draw rings and with means providing said fluid under pressure so that it operatively associates with said cylinder.
  • a method as set forth in claim 13 in which said step of moving said first die structure with actuating means comprises moving said first die structure with the ram of a press.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US00356964A 1973-05-03 1973-05-03 Apparatus for and method of drawing a cup-shaped article Expired - Lifetime US3817076A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00356964A US3817076A (en) 1973-05-03 1973-05-03 Apparatus for and method of drawing a cup-shaped article
CA195,241A CA1003702A (en) 1973-05-03 1974-03-18 Apparatus for and method of drawing a cup-shaped article
GB1775774A GB1442066A (en) 1973-05-03 1974-04-23 Apparatus for drawing a cup-shaped article
AU68224/74A AU463165B2 (en) 1973-05-03 1974-04-24 Apparatus forand method of drawing a cup-shaped article
JP4962274A JPS5315826B2 (enrdf_load_stackoverflow) 1973-05-03 1974-05-02
DE2421218A DE2421218A1 (de) 1973-05-03 1974-05-02 Metallziehvorrichtung
FR7415432A FR2227910B1 (enrdf_load_stackoverflow) 1973-05-03 1974-05-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00356964A US3817076A (en) 1973-05-03 1973-05-03 Apparatus for and method of drawing a cup-shaped article

Publications (1)

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US3817076A true US3817076A (en) 1974-06-18

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US00356964A Expired - Lifetime US3817076A (en) 1973-05-03 1973-05-03 Apparatus for and method of drawing a cup-shaped article

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US (1) US3817076A (enrdf_load_stackoverflow)
JP (1) JPS5315826B2 (enrdf_load_stackoverflow)
AU (1) AU463165B2 (enrdf_load_stackoverflow)
CA (1) CA1003702A (enrdf_load_stackoverflow)
DE (1) DE2421218A1 (enrdf_load_stackoverflow)
FR (1) FR2227910B1 (enrdf_load_stackoverflow)
GB (1) GB1442066A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007621A (en) * 1974-05-06 1977-02-15 The Metal Box Limited Containers
DE2755495A1 (de) * 1976-12-14 1978-06-15 Redicon Corp Zweiseitig arbeitende behaelterformpresse
US4326402A (en) * 1980-04-18 1982-04-27 Wallis Bernard J Stock lifter for progressive dies
US4414836A (en) * 1982-09-30 1983-11-15 National Steel Corporation Method of and apparatus for deep drawing metal containers
US4499750A (en) * 1981-09-12 1985-02-19 L. Schuler Gmbh Drawing device for presses with mechanically driven drawing ram
US4592220A (en) * 1984-08-07 1986-06-03 Rca Corporation System and method for the in press adjustment of workpiece holding force
WO1986005421A1 (en) * 1985-03-15 1986-09-25 Weirton Steel Corporation Drawn can body method, apparatus and products
US6244091B1 (en) * 1999-11-10 2001-06-12 Can Industry Products, Inc. Apparatus and method for forming cup-shaped members
CN104785599A (zh) * 2014-01-22 2015-07-22 广东科达洁能股份有限公司 新型金属复合成型自动液压机
CN105215165A (zh) * 2015-09-15 2016-01-06 无锡威唐工业技术有限公司 一种机械延时系统
US20200197997A1 (en) * 2018-12-19 2020-06-25 Dajun Zhou Stretch forming die

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020670A (en) * 1976-03-19 1977-05-03 Redicon Corporation Triple action mechanism for producing high reduction cups in a double action press
US4125009A (en) * 1977-04-28 1978-11-14 The Stolle Corporation Blank and draw apparatus with gap control
JPS57500274A (enrdf_load_stackoverflow) * 1980-02-21 1982-02-18
JPS6125890A (ja) * 1984-07-16 1986-02-04 富士ゼロックス株式会社 製本装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH280900A (de) * 1949-07-18 1952-02-15 Abdel Dr Aziz Mostafa Kamal Blechhalter für Tiefziehpressen.
US3420089A (en) * 1966-02-16 1969-01-07 Mc Donnell Douglas Corp Variable pressure drawpress and method
US3494169A (en) * 1966-01-21 1970-02-10 Nat Steel Corp Deep drawing method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH280900A (de) * 1949-07-18 1952-02-15 Abdel Dr Aziz Mostafa Kamal Blechhalter für Tiefziehpressen.
US3494169A (en) * 1966-01-21 1970-02-10 Nat Steel Corp Deep drawing method and apparatus
US3420089A (en) * 1966-02-16 1969-01-07 Mc Donnell Douglas Corp Variable pressure drawpress and method

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007621A (en) * 1974-05-06 1977-02-15 The Metal Box Limited Containers
DE2755495A1 (de) * 1976-12-14 1978-06-15 Redicon Corp Zweiseitig arbeitende behaelterformpresse
US4326402A (en) * 1980-04-18 1982-04-27 Wallis Bernard J Stock lifter for progressive dies
US4499750A (en) * 1981-09-12 1985-02-19 L. Schuler Gmbh Drawing device for presses with mechanically driven drawing ram
US4414836A (en) * 1982-09-30 1983-11-15 National Steel Corporation Method of and apparatus for deep drawing metal containers
WO1984001314A1 (en) * 1982-09-30 1984-04-12 Nat Steel Corp Method of and apparatus for deep drawing metal containers
US4592220A (en) * 1984-08-07 1986-06-03 Rca Corporation System and method for the in press adjustment of workpiece holding force
WO1986005421A1 (en) * 1985-03-15 1986-09-25 Weirton Steel Corporation Drawn can body method, apparatus and products
US6244091B1 (en) * 1999-11-10 2001-06-12 Can Industry Products, Inc. Apparatus and method for forming cup-shaped members
CN104785599A (zh) * 2014-01-22 2015-07-22 广东科达洁能股份有限公司 新型金属复合成型自动液压机
CN105215165A (zh) * 2015-09-15 2016-01-06 无锡威唐工业技术有限公司 一种机械延时系统
US20200197997A1 (en) * 2018-12-19 2020-06-25 Dajun Zhou Stretch forming die
US10933458B2 (en) * 2018-12-19 2021-03-02 Fca Us Llc Stretch forming die

Also Published As

Publication number Publication date
JPS5315826B2 (enrdf_load_stackoverflow) 1978-05-27
AU463165B2 (en) 1975-07-17
FR2227910B1 (enrdf_load_stackoverflow) 1978-01-13
GB1442066A (en) 1976-07-07
DE2421218A1 (de) 1974-11-14
AU6822474A (en) 1975-07-17
JPS5015174A (enrdf_load_stackoverflow) 1975-02-18
FR2227910A1 (enrdf_load_stackoverflow) 1974-11-29
CA1003702A (en) 1977-01-18

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