US3423985A - Stripper and pre-draw ring for wall-ironing can bodies - Google Patents

Stripper and pre-draw ring for wall-ironing can bodies Download PDF

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Publication number
US3423985A
US3423985A US525098A US3423985DA US3423985A US 3423985 A US3423985 A US 3423985A US 525098 A US525098 A US 525098A US 3423985D A US3423985D A US 3423985DA US 3423985 A US3423985 A US 3423985A
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United States
Prior art keywords
ironing
cup
ironing punch
punch
stripper
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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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US525098A
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English (en)
Inventor
Ralph J Stolle
Elton G Kaminski
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Stolle Corp
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Stolle Corp
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Publication date
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Publication of US3423985A publication Critical patent/US3423985A/en
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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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/06—Stripping-off devices
    • 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
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies

Definitions

  • This invention relates to the production of can bodies having integral ends (two-piece cans), and more particularly to improvements in wall ironing, tooling and tech nique.
  • Metal cans have generally been made either as threepiece cans or two-piece cans.
  • the can body is made from sheet, metal and two separate end members are provided which are then secured to the body to complete the can. More recently, however, cans have been made in the two-piece form wherein the can body and one can end are integral and a separate end is later attached to the open end of the piece having the body with one integral end.
  • Two-piece cans may be made in several ways.
  • One of these is the so-called wall iron process wherein a shell cup is produced from sheet metal by conventional drawing techniques and is then redrawn to a cup of longer length and smaller diameter and the redrawn cup is then walled iron to produce the required body length and wall thickness.
  • a second way of forming a can body with an integral end is the so-called impact and iron forming process wherein a short cup of proper diameter but with a heavy wall thickness is formed by the so-called impactextrusion-forming process.
  • the impact extruded short cup is then pushed through ironing dies to reduce the wall thickness and increase the length of the cup to the required length for trimming and flanging operations.
  • a third way of producing a can body with an integral end is the so-called impact-extrusion-forming process wherein a metal disc or slug is extruded into a die in an impact-extrusion-forming apparatus under tremendous pressure. In this process the entire forming operation is completed almost instantaneously and no further ironing of the wall is necessary.
  • a conventional cup formed as hereinbefore indicated, is drawn to a can body of longer length by being placed on an ironing punch which is then inserted into a series of ironing rings so as to form the over-sized cup into intimate agreement with the ironing punch and to iron the cup sidewall to the proper can body length.
  • the conventional over-sized cups are generally not con- 3,423,985 Patented Jan. 28, 1969 centric with the ironing punch because the inside diameter of the cups is appreciably greater than the diameter of the ironing punch, causing the cups to hang on the ironing punch.
  • one of the principal objects of the present invention is to provide an apparatus which will perform the basic metal forming operation of forming the sidewall of each cup into intimate contact with the ironing punchafter which time a series of ironing rings will then iron the sidewall thickness of each cup to proper can body length.
  • Another object of the instant invention is to provide an apparatus which will eliminate the necessity for any forming effort by the ironing rings.
  • Another object of the instant invention is to provide an apparatus which will eliminate fracturing and rupturing of over-sized cups during the ironing process.
  • Still a further object of the instant invention is to provide an apparatus which will operate so that the ironing rings which iron the over-sized cups into can bodies do not perform the basic metal forming operation but only iron the sidewall thickness of each cup after the sidewall has come into intimate contact with the ironing punch.
  • the can body so formed must be removed or stripped from the ironing punch.
  • a split plate or collet type stripper is employed to bear upon the open end of the can body to physically force the can body from the ironing punch. Such a procedure has proven inadequate because it substantially damages the open end of the can body by curling, marking and splitting the end.
  • FIGURE 1 is a perspective view of an over-sized cup having an integral end, as seen from the open end.
  • FIGURE 2 is a partial fragmentary cross-sectional view of a conventional ironing punch, having an oversized cup hanging therefrom, and an ironing ring.
  • FIGURE 3 is a partial fragmentary cross-sectional view of a conventional apparatus for stripping can bodies from an ironing punch.
  • FIGURE 4 is a perspective view of a can body having an integral end which has been ironed on a conventional ironing punch by a series of ironing rings and then removed from such ironing punch by means of a conventional stripper.
  • FIGURE 5 is a partial fragmentary cross-sectional view of an apparatus according to the instant invention.
  • the over-sized cup is placed on an ironing punch and the walls thereof are ironed or drawn so that the cup is formed into a can body having an integral end.
  • the over-sized cup on the ironing punch is first subjected to a pre-draw ring before it is ironed in a series of ironing rings.
  • the entry angle of the first ironing ring will not perform the basic metal forming operation, but will only iron the sidewall thickness of each cup after the sidewall has come into intimate contact with the ironing punch.
  • the over-sized cup After the over-sized cup has proceeded through the series of ironing rings so that it is ironed into a can body having an integral end, it must then be removed from the ironing punch. Removal is accomplished according to the instant invention by means of a stripper arm, housed within the ironing punch, which moves outwardly from the end of the ironing punch, bearing uniformly upon the inside of the integral end of the can body. Simultaneously with the movement of the stripper arm outwardly, air is supplied through a valve or valves to the inside of the can body as a vacuum break so that the can body does not collapse during the stripping of the can from the ironing punch.
  • FIGURE 1 shows an over-sized cup which has been produced from a sheet metal slug either by conventional drawing techniques or by the so-called impact-extrusionforming process. It should be noted that the cup 10 is relatively short and that it has a heavy sidewall thickness 12.
  • FIG- URE 2 A conventional ironing arrangement is shown in FIG- URE 2.
  • the over-sized cup 10 is placed upon the ironing punch 14.
  • the diameter of the cup 10 is substantially larger than the diameter of the ironing punch 14 in order to allow for the placement of the cup 10 upon the ironing punch 14. It necessarily follows, therefore, that the cup .10 will not be concentric with respect to the ironing punch 14 because of its tendency to hang therefrom.
  • Means (not shown) are provided for moving the ironing punch 14 through an ironing ring 16 so as to reduce the wall thickness 12 of the cup 10 and increase the length of the cup to the required length of a can body 11 before trimming and fianging operations.
  • the side-wall ironing will vary around the circumference of the ring and, in most instances, the can body 11 so produced will not be circular, but oval, as seen in FIG- URE 4. Additionally, because substantially all the first forming is done by the ironing ring .16, where the diametric difference 18 is great, the can body so formed often ruptures, as shown at 20 in FIGURE 4.
  • the can body 11 so formed must be removed from the ironing punch 14. Removal is generally accomplished by means of a conventional stripper 22, as shown in FIGURE 3. Means are provided (not shown) for moving the stripper 22 along the sides of the ironing punch 14 to push the can body 11 off of the ironing punch 14. As can be seen, conventional strippers 22 have proven to be unsatisfactory because they damage the open end of the can body 10 by curling, marking and splitting the end, as shown at 24 in FIGURES 3 and 4.
  • FIGURE 5 is a fragmentary cross-sectional view of an apparatus according to the instant invention.
  • the side-wall of an over-sized cup .10 is first formed into intimate contact 29 with the ironing punch 14, and is then ironed to form the can body 11.
  • a cup 10 is placed upon the ironing punch 14.
  • the ironing punch is then moved through the pre-draw ring 28 and then into a series of ironing rings 16. For purpose of simplicity only two ironing rings '16 are shown.
  • the pre-draw ring 28 performs the basic forming operation whereby the cup 10 comes into intimate contact 29 with the surface of the ironing punch 14.
  • the pre-draw ring 28 assures that the cup 10 will be concentric with respect to the ironing punch 14 so that the diametric difference 18 will be substantially the same on both sides of the ironing punch. This, of course, assures that any future ironing will be uniform around the cup 10 and that the cup 10 will not rupture.
  • the pre-d.raw ring 28 has an aperture 30 which receives the cup 10 on the ironing punch 14.
  • the aperture 30 has rounded corners 32 which aid in aligning the cup 10.
  • each ironing ring 16 contains an aperture 34, having a centrally located edge 35, the diameter of which is just slightly less than the diameter of the cup 10 on the ironing punch 14 after it has passed through the immediately preceding ironing ring 16 or the pre-draw ring 28, as the case may be.
  • Each ironing ring 16 also has an angular edge 36 leading to the centrally located edge of the aperture 34.
  • the ironing rings 16 simply iron the sidewall thickness of the cup 10, making it less and less, until a can body 11 of sufficient length has been formed.
  • the can body 11 formed by the ironing rings is substantially circular in shape and that the ironed side-wall does not vary around the circumference of the can body 11. Also, the can body 11 has not been ruptured. Additionally, there is much less effort required for the ironing rings 16 to properly iron the sidewalls of the cup 10.
  • the integral can end 38 may be domed as shown in FIGURE 5. This may be accomplished by moving the integral end 38 of the can body 11 on the ironing punch 14 against a die (not ShOWn), the diameter of which is slightly less than the diameter of the can body. The end of the ironing punch 14 is recessed to receive the die.
  • the ironing punch 14 has a substantially concentric bore 44, somewhat enlarged at one end, extending its entire length into which a bushing 46 has been fit.
  • An arm 48 is located within the bushing 46.
  • An enlarged head 50 with a circular recess to receive the domed integral can end 40, is mounted at the end of arm 48. It should be noted that the enlarged head 50 is within the ironing punch '14 when the arm 48 is retracted within the ironing punch 14.
  • Radial duct 52 leads into two annular chambers 54 formed by punch cap 55 which is held in place over the bushing 46 in the enlarged end of the bore 44 by cap screws 57 (only one is shown). It should be noted that the edges 56 of one annular chamber 54 act as a valve seat against which the enlarged head 50 may rest.
  • means are provided to move the arm 48 in an outward direction away from the ironing punch 14. Air pressure at approximately pounds per square inch is supplied to the duct 52. Immediately upon movement of the arm 48, the enlarged head 50 leaves the valve seat 56. The air pressure supplied through duct 52 immediately enters the vacuum in the cavity 58 formed by the can body and integral end as it leaves the ironing punch. For example, the movement of the stripper 42 and can body 11 in FIGURE 5 are indicated by dashed lines. Immediately when the enlarged head 50 leaves the valve seat 56, air pressure at 10 pounds per square inch enters cavity '58 to act as a vacuum break and to preclude the can bodys collapse due to atmospheric pressure acting on its sidewall.
  • the enlarged head '50 of stripper 42 has a uniform bearing against the inside of the integral can end 40. This, of course, prevents damage to the can end. Additionally, there is no damage to the can body 11 or curling or bending of the can body edge 24.
  • each cup having an integral end, into can bodies of the type having a cylindrical ironing punch for receiving said over-sized cups, the outside diameter of said ironing punch being less than the inside diameter of said over-sized cups, and said ironing punch having a substantially concentric bore therein, said bore being enlarged at the cup receiving end of said ironing punch, a stripper located within said bore of said ironing punch to strip said can bodies from said ironing punch, at least one ironing ring associated with said ironing punch to iron the side walls of said over-sized cups, means for moving said ironing punch through said ironing ring, and means for actuating said stripper, the improvement which comprises at least one pre-draw ring disposed intermediate said ironing punch and said ironing ring through which said ironing punch moves prior to movement through said ironing ring, said pre-draw ring having an inside diameter which is slightly less than the outside diameter of said over-sized cup, and having the edge of said inside diameter which is first contiguous with
  • said stripper comprises:
  • valve seat (b) a valve seat, said valve seat being within said enlarged portion of said bore within said ironing punch;
  • an enlarged head defining a portion of said stripper said head being substantially the size of said integral end of said can body and slidably mounted at the end of said arm so as to be within said'enlarged portion of said bore within said ironing punch and resting against said valve seat when said arm remains retracted within said ironing punch;
  • valve seat (b) a valve seat, said valve seat being within said enlarged portion of said bore within said ironing punch;
  • an enlarged head substantially the size of said integral end of said can body, said head being slidably mounted at the end of said arm so as to be within said enlarged portion of said bore within said ironing punch and resting against said valve seat when said arm remains retracted within said ironing punch, whereby said head acts as a valve against said valve seat;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US525098A 1966-02-04 1966-02-04 Stripper and pre-draw ring for wall-ironing can bodies Expired - Lifetime US3423985A (en)

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US52509866A 1966-02-04 1966-02-04

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US (1) US3423985A (pt)
BE (1) BE693636A (pt)
BR (1) BR6786844D0 (pt)
CH (1) CH468217A (pt)
DE (1) DE1602576B2 (pt)
FR (1) FR1510431A (pt)
NL (1) NL6701541A (pt)
SE (1) SE315564B (pt)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603275A (en) * 1969-11-06 1971-09-07 Dayton Reliable Tool & Mfg Co Method of forming can bodies
US3712107A (en) * 1971-03-04 1973-01-23 Crown Cork & Seal Co Apparatus for and method of stripping containers from metal working punches
US3730383A (en) * 1971-07-29 1973-05-01 Aluminum Co Of America Container body and a method of forming the same
US3760751A (en) * 1971-10-29 1973-09-25 Pittsburh Aluminum Container body and a method of forming the same
US3771344A (en) * 1972-10-30 1973-11-13 Crown Cork & Seal Co Apparatus for stripping container bodies from metal working punches
DE2353209A1 (de) * 1973-04-23 1974-11-07 Continental Can Co Tiefgezogener behaelter und verfahren zu seiner herstellung
US3893326A (en) * 1972-11-16 1975-07-08 Wmf Wuerttemberg Metallwaren Apparatus for reduction drawing of hollow bodies of stainless steel
US4065951A (en) * 1976-11-03 1978-01-03 National Can Corporation Split punch for drawing and ironing containers
US4541265A (en) * 1979-06-07 1985-09-17 Purolator Products Inc. Process for forming a deep drawn and ironed pressure vessel having selectively controlled side-wall thicknesses
EP0298560A2 (en) * 1987-07-10 1989-01-11 Hoogovens Groep B.V. Method and apparatus for ironing the wall of a one-piece cylindrical body, and a body formed in this way
US6131761A (en) * 1998-06-03 2000-10-17 Crown Cork & Seal Technologies Corporation Can bottom having improved strength and apparatus for making same
US20220008981A1 (en) * 2018-12-04 2022-01-13 Novelis Inc. Redraw and ironing system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA712359B (en) * 1970-08-11 1972-01-26 Crown Cork & Seal Co Method of and apparatus for fabricating seamless containers
US3702559A (en) * 1971-01-11 1972-11-14 Stolle Corp Can body making machine
NL168150C (nl) * 1972-06-23 1982-03-16 Yoshizaki Kozo Inrichting voor het vormen van bekervormige metalen voorwerpen.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US398229A (en) * 1889-02-19 Drawing-press
US2261060A (en) * 1938-08-15 1941-10-28 Fulton Sylphon Co Automatic tube drawing press
US2379450A (en) * 1942-06-16 1945-07-03 Musser Clarence Walton Primer manufacture
US3270544A (en) * 1963-06-26 1966-09-06 Reynolds Metals Co Can forming apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US398229A (en) * 1889-02-19 Drawing-press
US2261060A (en) * 1938-08-15 1941-10-28 Fulton Sylphon Co Automatic tube drawing press
US2379450A (en) * 1942-06-16 1945-07-03 Musser Clarence Walton Primer manufacture
US3270544A (en) * 1963-06-26 1966-09-06 Reynolds Metals Co Can forming apparatus

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603275A (en) * 1969-11-06 1971-09-07 Dayton Reliable Tool & Mfg Co Method of forming can bodies
US3712107A (en) * 1971-03-04 1973-01-23 Crown Cork & Seal Co Apparatus for and method of stripping containers from metal working punches
US3730383A (en) * 1971-07-29 1973-05-01 Aluminum Co Of America Container body and a method of forming the same
US3760751A (en) * 1971-10-29 1973-09-25 Pittsburh Aluminum Container body and a method of forming the same
US3771344A (en) * 1972-10-30 1973-11-13 Crown Cork & Seal Co Apparatus for stripping container bodies from metal working punches
US3893326A (en) * 1972-11-16 1975-07-08 Wmf Wuerttemberg Metallwaren Apparatus for reduction drawing of hollow bodies of stainless steel
DE2353209A1 (de) * 1973-04-23 1974-11-07 Continental Can Co Tiefgezogener behaelter und verfahren zu seiner herstellung
US4065951A (en) * 1976-11-03 1978-01-03 National Can Corporation Split punch for drawing and ironing containers
US4541265A (en) * 1979-06-07 1985-09-17 Purolator Products Inc. Process for forming a deep drawn and ironed pressure vessel having selectively controlled side-wall thicknesses
EP0298560A2 (en) * 1987-07-10 1989-01-11 Hoogovens Groep B.V. Method and apparatus for ironing the wall of a one-piece cylindrical body, and a body formed in this way
US4881394A (en) * 1987-07-10 1989-11-21 Hoogovens Groep B.V. Method and apparatus for ironing the wall of a one-piece cylindrical body
EP0298560A3 (en) * 1987-07-10 1990-08-29 Hoogovens Groep B.V. Method and apparatus for ironing the wall of a one-piece cylindrical body, and a body formed in this way
US6131761A (en) * 1998-06-03 2000-10-17 Crown Cork & Seal Technologies Corporation Can bottom having improved strength and apparatus for making same
US6220073B1 (en) 1998-06-03 2001-04-24 Crown Cork & Seal Technologies Corporation Can bottom having improved strength and apparatus for making same
US20220008981A1 (en) * 2018-12-04 2022-01-13 Novelis Inc. Redraw and ironing system

Also Published As

Publication number Publication date
FR1510431A (fr) 1968-01-19
CH468217A (de) 1969-02-15
BR6786844D0 (pt) 1973-05-03
DE1602576A1 (de) 1971-11-18
DE1602576B2 (de) 1974-11-28
SE315564B (pt) 1969-10-06
BE693636A (pt) 1967-07-17
NL6701541A (pt) 1967-08-07

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