US3822576A - Redrawing apparatus - Google Patents

Redrawing apparatus Download PDF

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Publication number
US3822576A
US3822576A US00315228A US31522872A US3822576A US 3822576 A US3822576 A US 3822576A US 00315228 A US00315228 A US 00315228A US 31522872 A US31522872 A US 31522872A US 3822576 A US3822576 A US 3822576A
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United States
Prior art keywords
blank
redrawing
blanks
die
members
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Expired - Lifetime
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US00315228A
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English (en)
Inventor
J Hardt
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.)
Alcan Holdings Switzerland AG
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Alusuisse Holdings AG
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Publication date
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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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses

Definitions

  • the redrawing station includes a pusher unit 72/420 42 disposed coaxially about said punch for axially pushing the blank-clamping piece of each member successive- [5 References Cited sively located at said redrawing station to a position in UNITED STATES PATENTS which a blank carried by said member is clamped 3289 453 12/1966 Wyle et al 72/349 agamst sald (he dunng redrawmg' 3,478,563 11/1969 Bozek 72/349 15 Claims, 4 Drawing Figures MENTED JUL 91574 sum 1 BF 4 @PATENIEU JUL SIQM SHEEI 3 [IF 4 ATENTEB JUL 9 I974 sum w Z1 1 REDRAWING APPARATUS
  • the invention relates to apparatus for redrawing cupshaped blank
  • a known apparatus of this type described in US. Pat. No. 3,478,5 63 comprises an indexed conveying platform or turret for receiving blanks and conveying them to a redrawing station where the blanks are redrawn by means of a punch.
  • the turret includes a plurality of blank carrying members, one for each indexed position of the turret, each including a redrawing die and a device for clamping a blank against the redrawing die.
  • Each blank clamping device includes a centrally bored ment of the turret to move the workpieces from one work station to the next, and therefore limits the work ing rate. Moreover, the provision of a plurality of dies with means for actuating an associated blank clamping device adds to the cost price of the apparatus.
  • An aim of the invention is to provide an apparatus for redrawing cup-shaped blanks, comprising an indexed conveying platform or turret whose mass (and moment of inertia) can be reduced compared to that of the known device referred to above, thereby enabling 'an increase in the working rate.
  • an apparatus for redrawing cup-shaped blanks comprising a conveying turretfor receiving blanks and conveying them with a step-by-step rotary movement to a redrawing station including a redrawing die and a punch between which the turret moves, said turret including a plurality of members for carrying blanks the number of which members-is equal to the number of steps of the turret per rotation thereof, said members each including a tubularcylindrical blank-clamping piece axially slidably mounted in the turret, and said redrawing station including means disposed generally coaxially about said punch for axially pushing the blankclamping piece of each member successively located at said redrawing station to a position in which a blank carried by said member is clamped against said die.
  • FIG. 1 is a plan view of an apparatus according to the invention, partially in cross-section taken along line I-I of FIG. 2;
  • FIG. 2 is a side elevational view of the apparatus, as seen along line II--Il of FIG. 1;
  • FIG. 3 is a schematic end elevational view of part of the apparatus seen looking from the right of FIG. 2;
  • the apparatus also includes a rotary conveying turret includinga platform 3 whose hub is keyed on a shaft 4 parallel to the axis of die 2 and punch 1. On shaft 4, which is rotatably mounted in a bearing 6' of the frame, is also keyed a disk 5 for transporting and unloading articles formed from blanks, disk 5 thus being coaxial with platform 3.
  • a pusher unit composed of elements 13 to 19, including a central aperture disposed concentrically about the path of punch 1.
  • This pusher unit includes a bored plate 13 having, on its face directed towards die 2, an annular recess 14 which is fluidtightly closed by an axially displaceable elastic membrane 15.
  • a rigid washer 16 provided with a central cylindrical sleeve 17 whose inner diameter is large enough to allow punch 1 to slide freely therein.
  • annular pieces 18 and 47 are clamped to plate 13 by means of annular pieces 18 and 47 respectively, which are secured by any adequate means, such as by gluing, vulcanisation or by means of screws.
  • Annular piece 18 has a radially inwardly directed flange 19 which serves as a stop to limit the movement of washer l6 and sleeve 17 which together form a push-piece.
  • the annular chamber defined by recess 14 communicates via an inlet aperture 20 of plate 13 with a tube connected to means (not shown) for supplying compressed air.
  • plate 13 has two cylindrical protuberances 11 and 12 diametrally opposed about the axis of, punch l and serving as bearings for two square headed bored blocks 9 and 10 about which engage U-shaped ends 8a and 8b of a fork 8 pivotally mounted on an end of a lever 7.
  • Lever 7 and fork 8 formpart of a device for driving the pusher unit 13 to 19 with a reciprocating axial movement, the remainder of this device, for example including a cam orother known means acting on lever 7, not beingshown in the drawings.
  • a separate device, also not shown, is provided for axially reciprocating punch 1, the punch being held accurately along the axis of die 2 by means of a fixed guide bearing 21-(FIG. 2).
  • the turret has four identical members 24, 25, 26 and 27 disposed on the platform 3 at to one another about its central axis, these members being adapted to receive blanks 30, carry the blanks to the redrawing tation between punch 1 and die 2, and clamp the blanks during redrawing.
  • Platform 3 also has a peripheral toothing meshing with a toothed wheel 33 (FIG. 1) of an indexing mechanism for driving the platform 3 with a step-by-step rotary motion, displacing platform 3 by an amountof 90 each step.
  • Each of members 24 to 27 is thus made to successively occupy four positions per rotation of platform 3: a loading position I, a dwell position II, a redrawing position III, and an unloading position IV.
  • Each of members 24 to 27 comprises, as is shown for member 26 in FIG. 1, a tubular cylindrical body 28 axially slidably mounted in a sleeve-like bearing 31 fixed to platform 3.
  • the end of body 281 towards the pusher unit 13 to 19 has a radially inwardly directed shoulder in which a tubular cylindrical blank clamping piece or sleeve 32 is force fitted.
  • Body 28 and sleeve 32 are thus solidlyfixed together and define therebetween an annular chamber in which a blank 30 of suitable dimensions can be received. as is shown in FIG. 1.
  • blanks 30 are fed to platform 3 by a loading mechanism including a vertical supply channel, defined by a set of bars 35 to 40, in which blanks 30 are piled and are able to drop by gravity as indicated by the arrow in FIG. 3, and a pusher 41 reciprocated by means of a device including a fork 42 so as to push the lowermost blank 30 towards whichever of members 24 to 27 is at position I.
  • a loading mechanism including a vertical supply channel, defined by a set of bars 35 to 40, in which blanks 30 are piled and are able to drop by gravity as indicated by the arrow in FIG. 3, and a pusher 41 reciprocated by means of a device including a fork 42 so as to push the lowermost blank 30 towards whichever of members 24 to 27 is at position I.
  • the generally cup-shaped blanks 30, which are formed for example in aluminium by a preliminary drawing operation, have an inner diameter greater than the outer diameter of sleeve 32 and an outer diameter less than the inner diameter of body 28, and a length such that the flat base of each blank 30 comes to bear against the outer edge of sleeve 32.
  • pusher 41 supplies a blank 30 to one of members 24 to 27 formed by a sleeve 32 and a body 28, the member is moved by the fed blank 30 to an initial position defined by the stop-forming shoulder 48.
  • the unloading disk has at its periphery four cylindrical recesses 43 to 46 (best seen in FIG. 3) corresponding to respective members 24 to 27.
  • Said recesses are of a complementary shape and size to a part of the outer cylindrical surfaces of articles 30 (shown in broken lines in FIGS. 1 and 3) formed from the blanks 30 by redrawing, and are disposed so as to successively receive articles formed at the redrawing station.
  • FIG. 1 shows an article 3040 formed by pushing a blank 30 held by member 26 through die 2 by means of punch l, and which engages in recess 45 at position III of disk 5.
  • a stop 56 of frame 6 limits the axial displacement of article 30'.
  • the cylindrical surfaces of recesses 43 to 46 have holes 49 (FIG. 1) communicating via bores in disk 5 with a vacuum source (not shown) by means of which articles 30 are held in the recesses when the punch l is withdrawn.
  • a blockingdevice (not shown) cuts off the supply of vacuum to the recess arriving at position IV, where the articles 30 are thus freed and drop onto a conveyor belt 47 (FIG. 3).
  • turret is empty, i.e. that members 24 to 27 carry no blanks.
  • a blank 30 is pushed by pusher 41 into whichever of members 24 to 27 is at the loading position I, the loaded blank 30 pushing the sleeve 32/body 28 assembly to its extreme position defined by shoulder 48.
  • Platform 3 is then made to undergo a rotation of a quarter of a turn in the clockwise direction (FIG. 3) which brings the loaded blank to dwell position II, and another blank is fed to the member at position I. Platform 3 is then rotated by a further quarter of a turn, which brings the first-loaded blank 30 to position III between the punch 1 and die 2 of the redrawing station.
  • the pusher unit 13 to 19 moves forwards, as shown in FIG. 1, with the push-piece forming sleeve 17 bearing against the blank-gripping piece or sleeve 32 located at position III. Flange 16 is pushed rearwardly, so that membrane 15 takes up play.
  • the pressure of pusher unit 13 to 19 is transferred, as a function of the pressure of the compressed air in the chamber of recess 14,
  • the outward displacement of membrane 15 is limited by flange 19 of piece 18, which forms a stop for washer l6 fixed to membrane 15.
  • the redrawing die 2 is of a known type, the diameter of punch 1 being equal to the inner diameter of die 2 reduced by twice the thickness of the wall of a blank 30, in a case where the diameter of the blank has to be reduced without any substantial reduction of the wall thickness.
  • FIG. 4 which shows a varied embodiment in which the mass of the turret is even further reduced, is a schematic cross-section through a part of a blank carrying member locatedat a redrawing station.
  • the blank carrying members are each formed simply by a blank-gripping piece in the form of a tubular cylindrical sleeve 52 slidably mounted in a circular hole 51 of platform 3, holes 51 each being provided with a chafing or bearing ring 55. Each sleeve 52 is urged,
  • the cylindrical wall of a blank 30 fits about the sleeve 52, but in this variacomprising a rotationally mounted conveying turret for receiving blanks and conveying them with a step-bystep rotary movement to a redrawing position, a redrawing station for redrawing a blank when same is in the redrawing position including a redrawing die and a punch disposed about the turret so that the turret moves therebetween, said turretincluding a plurality of tubular members for carrying blanks each having an inwardly directed shoulder, wherein the number of which members is equal to the number of steps of the turret per rotation thereof and wherein each member includes a tubular cylindrical blank-clamping piece axially slidably mounted in the turret and force-fitted in said inwardly directed shoulder of that member to define an annular blank receiving chamber between the tubular body of the members and the blank clamping piece, and wherein said redrawing station including means disposed
  • An apparatus as claimed in claim 1, comprising stop means for limiting the axial sliding movement of said blank-clamping pieces.
  • An apparatus as claimed in claim 1, comprising a mechanism for feeding to said members cup-shaped blanks the inner diameter of which is greater than the outer diameter of said blankclamping pieces, and a stop defining an initial position wherein each of said pieces are movable by a fed blank to the initial position defined by the stop.
  • said blank feeding mechanism comprises a supply channel in which blanks can be piled and drop by gravity
  • a pusher for pushing the lowermost blank in said channel towards a member in a loading position.
  • said pushing means of said redrawing station comprises means defining an annular enclosure, an axially displaceable elastic membrane fluidtightly closing the enclosure, means for communicating said chamber with a source of compressed air, a rigid part connected to said membrane, and means for axially reciprocating said enclosure to make said rigid part bear against said blank-clamping piece.
  • each blank-clamping piece is urged by a spring away from the blank clamping position.
  • An apparatus comprising an unloading disk mounted coaxially for rotation with said turret, said disk having at its periphery a plurality of cylindrical recesses each corresponding to one of said members, said recesses being of complementary shape and size to part of the outer cylindrical surfaces of articles formed from said blanks and being disposed so as to successively receive articles formed at said redrawing station, said disk including means for holding formed articles in said recesses.
  • An apparatus for redrawing cup-shapedblanks received therein during use comprising: rotatable means receptive of a cup-shaped blank during use for moving same from a loading position to a redrawing position including means defining a plurality of axially slidable cylindrical blank-receiving chambers mounted on the means for moving and rotatable therewith and each having a cylindrical slot at one end portion thereof receptive of the open end portion of a blank; and means for redrawing a blank when same is in the redrawing position comprising die means disposed at the receiving end side of the means for moving and means for punching disposed on the other side of the means for moving and including means fixedly mounted with respect to the rotational movement of said blank-receiving chambers for pushing said blank-receiving chamber towards said die means to clamp the blank between said one end portion of said blank-receiving chamber and said die means.
  • each blank-receiving chamber comprises an outer cylindrical member having a diameter greater than that of the blank and an inner cylindrical member disposed coaxially within said outer cylindrical member and having a diameter less than that of the blank whereby the circumferential wall of the blank is received between the inner and outer cylindrical members, and means mounting said inner and outer cylindrical members together for axially slidable movement, and wherein said means for pushing includes means for engaging with said inner cylindrical member to push said blank-receiving chamber towards said die means thereby clamping the blank between one end portion of said inner cylindrical member and said die means.
  • said means for feeding comprises a supply channel in which blanks can be piled and drop by gravity, and a pusher for pushing the lowermost blank in said channel towards said blank-receiving chamber when same is in loading position.
  • the pushing means comprises 'means defining an annular enclosure, an axially displaceable elastic membrane fluidtightly closing the enclosure, a source of compressed air, means for providing communication between said chamber and said source of compressed air, a rigid member connected to said membrane, and means for axially reciprocating said enclosure to make said rigid member bear against said inner cylindrical member.
  • An apparatus further comprising a spring for urging said blank-receiving chamber away from die means.
  • An apparatus further comprising an unloading disk mounted coaxially for rotation with said means for moving and having at its periphery 'a plurality of cylindrical recesses each corresponding to one of said blank-receiving chambers and each of said recesses being of complementary shape and size to part of the outer cylindrical surfaces of a redrawn blank disposed so as to successively receive same after redrawing, said disk including means for holding said redrawn blanks in said recesses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Punching Or Piercing (AREA)
  • Making Paper Articles (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
US00315228A 1971-12-17 1972-12-14 Redrawing apparatus Expired - Lifetime US3822576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1853771 1971-12-17

Publications (1)

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US3822576A true US3822576A (en) 1974-07-09

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Application Number Title Priority Date Filing Date
US00315228A Expired - Lifetime US3822576A (en) 1971-12-17 1972-12-14 Redrawing apparatus

Country Status (14)

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US (1) US3822576A (sv)
JP (1) JPS4868462A (sv)
AT (1) AT324078B (sv)
BE (1) BE792894A (sv)
CA (1) CA975619A (sv)
CH (1) CH546142A (sv)
DE (1) DE2259896C3 (sv)
FI (1) FI58878C (sv)
FR (1) FR2163505B1 (sv)
GB (1) GB1366799A (sv)
IT (1) IT971937B (sv)
NL (1) NL151918B (sv)
NO (1) NO138551C (sv)
SE (1) SE397480B (sv)

Cited By (4)

* 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
US4928511A (en) * 1988-12-13 1990-05-29 Sequa Corporation Rotary cup infeed
US6230538B1 (en) 1998-07-30 2001-05-15 Rd Systems Method and apparatus for deep drawing using a rotary turret
US6357982B1 (en) * 1997-06-17 2002-03-19 Crown Cork & Seal Technologies Corporation Apparatus for making can bodies

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289453A (en) * 1964-06-22 1966-12-06 Kaiser Aluminium Chem Corp Apparatus for manufacturing container bodies from blanks
US3478563A (en) * 1967-11-27 1969-11-18 Continental Can Co Apparatus for redrawing and wall ironing containers
US3635069A (en) * 1969-11-05 1972-01-18 Dayton Reliable Tool & Mfg Co Drive mechanism for multiple plungers
US3704619A (en) * 1971-06-14 1972-12-05 Standun Redraw blankholder positioning mechanism for cup-shaped article formers such as metallic can body formers and the like

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289453A (en) * 1964-06-22 1966-12-06 Kaiser Aluminium Chem Corp Apparatus for manufacturing container bodies from blanks
US3478563A (en) * 1967-11-27 1969-11-18 Continental Can Co Apparatus for redrawing and wall ironing containers
US3635069A (en) * 1969-11-05 1972-01-18 Dayton Reliable Tool & Mfg Co Drive mechanism for multiple plungers
US3704619A (en) * 1971-06-14 1972-12-05 Standun Redraw blankholder positioning mechanism for cup-shaped article formers such as metallic can body formers and the like

Cited By (4)

* 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
US4928511A (en) * 1988-12-13 1990-05-29 Sequa Corporation Rotary cup infeed
US6357982B1 (en) * 1997-06-17 2002-03-19 Crown Cork & Seal Technologies Corporation Apparatus for making can bodies
US6230538B1 (en) 1998-07-30 2001-05-15 Rd Systems Method and apparatus for deep drawing using a rotary turret

Also Published As

Publication number Publication date
DE2259896C3 (de) 1981-01-29
SE397480B (sv) 1977-11-07
CA975619A (en) 1975-10-07
FI58878C (fi) 1981-05-11
AT324078B (de) 1975-08-11
BE792894A (fr) 1973-03-30
IT971937B (it) 1974-05-10
NO138551C (no) 1978-09-27
NL151918B (nl) 1977-01-17
NL7217176A (sv) 1973-06-19
FI58878B (fi) 1981-01-30
JPS4868462A (sv) 1973-09-18
FR2163505B1 (sv) 1976-01-30
NO138551B (no) 1978-06-19
GB1366799A (en) 1974-09-11
CH546142A (fr) 1974-02-28
FR2163505A1 (sv) 1973-07-27
DE2259896A1 (de) 1973-06-20
DE2259896B2 (de) 1980-05-22

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