US3653301A - Drawing press pressure control - Google Patents

Drawing press pressure control Download PDF

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Publication number
US3653301A
US3653301A US52167A US3653301DA US3653301A US 3653301 A US3653301 A US 3653301A US 52167 A US52167 A US 52167A US 3653301D A US3653301D A US 3653301DA US 3653301 A US3653301 A US 3653301A
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United States
Prior art keywords
piston means
piston
pounds
cylinder
range
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Expired - Lifetime
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US52167A
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English (en)
Inventor
William H Clendenin
Thomas B Paumier
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PAUMIER Inc
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PAUMIER Inc
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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
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders

Definitions

  • a mechanism for controlling the pressure resisting the stroke ofa drawing press consists primarily of two fluid actuated control pistons.
  • the drawing stroke is first resisted by only one of the pistons and then, after a predetermined amount of movement, is resisted by both pistons.
  • the time which the stroke is resisted only by the first piston can be varied according to the physical properties of the material being drawn so that undesirable distortions in the article being manufactured are avoided.
  • This invention relates to a drawing press mechanism used primarily for forming cans, shells and the like out of sheet material. More particularly, this invention relates to an apparatus which adjustably controls the resistance furnished by the pressure pad in a drawing press.
  • the second piston will usuallyhave a large working It is a further object of the present invention to provide a device, as above, which is readily adjustable so that one drawing press can be used for a variety of sheet material gauges.
  • a standard drawing press is provided with a resistance pressure control which capitalizes on the speed of the ram and subsequent force created at the collision point so that the necessary large initial resistance pressure is provided.
  • This pressure is less than that of prior presses.
  • a greater amount of resistive force to replace that provided by the ram speed is created.
  • the initial force of the stroke is resisted by a first piston in a cylinder, the first piston presenting a small area upon which fluid pressure is allowed to work to provide only the increment of force (combined with the ram force) necessary to start the draw.
  • the remainder of the drawing stroke is then resisted by the total force acting against both pistons.
  • the space between the pistons can be adjusted so that the duration of the small resistance can be regulated and further adjustment of the pressure may be made by varying the speed of the ram itself.
  • FIG. 1 is a partially broken away cross section of a standard drawing press having a pressure control mechanism according to the present invention and shown at the beginning of the drawing stroke.
  • FIG. 2 is a partially broken away cross section sequentially following FIG. 1 showing the drawing press in a position just after the beginning of the drawing stroke.
  • FIG. 3 is an enlarged cross section of the blank and draw tooling portion of the device as shown in FIG. 2.
  • FIG. 4 is a partially broken away cross section sequentially following FIG. 2 showing the drawing press in a position substantially at the end of the drawing stroke.
  • FIG. 5 is a partially broken away cross section of the standard drawing press having a pressure control mechanism according to the present invention and shown in a position after the beginning of the retracting stroke sequentially following FIG. 4.
  • FIG. 6 is a partially broken away cross section sequentially following FIG. 5 showing the drawing press in a position substantially at the end of the retracting stroke.
  • FIG. 7 is a sectional view taken substantially along line 77 of FIG].
  • a drawing press mechanism is indicated generally by the numeral 10 and is shown as having an annular press bed 11 which carries a bolster plate 12.
  • a die holder 13 is carried by the bolster plate 12 and is provided in the top thereof, with two circular concentric recesses 14 and 15.
  • Recess 14 is adapted to receive the annular die ring 16, while recess 15 is adapted to receive the lower end of the die block or anvil 17.
  • a press slide plate 30 carries an annular punch holder 31 which has recesses 32 therein receiving the head of positioning bolts 33.
  • Bolts 33 carry a stock stripping ring 34 which remains biased toward the blank B by springs 35.
  • Die ring 37 has an annular shoulder 38 for engaging an inner die member 39.
  • Rod 40 Extending downwardly through slide plate 30 and punch holder 31 is a rod 40 which has a profile pad 41 at its lower end.
  • Rod 40 is normally held in the raised position by a spring 42 telescopically received around the upper end of rod 40 between a flange 43 and plate 30.
  • the upper inner surface of the annular punch holder 31 is provided with threads 44 which receive spring adjusting nut 45.
  • Nut 45 regulates the bias provided by disc spring 46 which serves to maintain the inner die member 39 flush on shoulder 38 and profile pad 41.
  • the drawing press mechanism hereinbefore described is a standard item such as that sold by The Minster Machine Company, Minster, Ohio. As such, said construction has been described only in general terms, the'details of the press being unimportant to the basic concept of the present invention.
  • the pressure control 50 consists of a first cylinder housing 51 having a piston 52 which is somewhat cup-shaped in cross-section having a base portion 53 and upright side portions 54. The top of each side 54 is in contact with the lower end of each pressure pin 18 of press 10. Near the top of piston 52 is a radially extending annular flange 55 which provides the relatively small working surface 56 as will hereinafter be described.
  • the base 53 of piston 52 is received through the ring-like portion 57 of cylinder housing 51 and into a dead air chamber 58 within a second cylinder housing 59. Thus portion 57 provides a common wall between cylinders 51 and 59.
  • bolts 60 Of course, whether one or two cylinder housings are presented, it is evident that the chambers for each piston must be separate.
  • the second cylinder housing 59 contains a T-shaped (in cross-section) piston 61 with the top portion 62 extending between the walls of the housing 59 and communicating on one side with chamber 58 and on the other side with air chamber 63.
  • the base of the T-shaped piston 61 is threaded at its lower end and extends through the bottom wall 64 of housing 59.
  • the initial position of piston 61 within housing 59 and thus the size of chamber 58 and the amount of movement of piston 61 is adjustable as by adjusting nuts 65.
  • a source offiuid under pressure (not shown) communicates with chamber 63 of cylinder 59 through hose 66 which is threaded into bottom wall 64. Further, the fluid under pressure is put in contact with the working surface 56 via conduit 67 which extends internally of the walls of cylinder housings 59 and 51. It is contemplated herein that the fluid being utilizcd is air under pressure. However, it is evident that the device described herein could be readily adapted for use with oil or other hydraulic fluid.
  • the press is in its inactive state with air pressure acting in chamber 63 against piston 61 (the adjusting nut 65 having been positioned as desired) and also through conduit 67 into the first cylinder 51 against surface 56.
  • the slide plate 30 and its associated members are-at the uppermost extent of their movement and the blank B is in position to be cut and drawn into a finished product.
  • the product being manufactured is a small specialty foodstuff can having the configuration as shown by the mating faces of the die 17 and profile pad 41.
  • This type of object is displayed herein merely as a typical example, it being understood that the principle described herein relates to controlling the resistance pressure no matter what the configuration of the object being drawn.
  • the shape shown is one which has proved particularly difficult to draw in the prior art structures discussed in that buckling or wrinkling in and around the contours of the profile pad 41 was prevalent.
  • the die ring 37 cuts the blank B and'the inner die member 39 begins drawing the blank along the die 17.
  • This downward movement shown in FIG. 2, is initially yieldingly resisted only by the fluid pressure acting against surface 56 of piston 52, the force being transmitted through pins 18, and thus the blank is quickly and cleanly sheared with buckling in the area indicated generally At the position shown in FIG. 2, the piston 61 has not yet moved, piston 52 having just come into contact therewith.
  • further downward travel of the-plate 30 to continue drawing the blank B over the die 17 is resisted by the fluid pressure against both pistons 52 and 61, piston 61 having a larger area exposed to the fluid pressure and therefore increasing the resistive force.
  • the adjusting nuts 65 have. moved with piston 61 and are shown moved away from bottom wall 64.
  • This increase in resistance to the downward stroke allows the blank to be carefully and slowly drawn into final shape with the pressure being carefully controlled so that the point of tensile strength of the material is only. approached and not surpassed. This is, of course, critical in metals where the tensile and yield points are quite close together.
  • pistons 52 and 61 can be carefully controlled, dependent on the specific tensile strength of the specific material being drawn. For example, if working with the H19 aluminum alloy which can have a range of tensile strengths from 33,000 to 42,000 pounds, it has been found that a corresponding range of 2,320 to 4,480 pounds of force exerted by piston 52 is sufficient and a corresponding range of 5,360 to 7,520 pounds of force exerted by both pistons 52 and 61 when working together is sufficient.
  • Apparatus for controlling the resistance to the downward stroke of a drawing press mechanism comprising, a first cylinder, a second cylinder aligned therewith, said first and second cylinders having a common wall between them, first piston means movable within said first cylinder, second piston means movable within said second cylinder, said first and second cylinder receiving fluid under pressure and means moving said first piston means responsive to the initial downward movement of the press against the fluid pressure in said first cylinder, said first piston means thereafter extending through said common wall to contact said second piston means, said second piston means being responsive to the movement of said first piston means so that continued movement of the press is resisted by fluid pressure acting against said first and second piston means.
  • Apparatus according to claim 1 having means to adjust the position of said second piston means relative to said first piston means.
  • piston means is in the range of 2,320 to 4,480 pounds and theexposed area of said first and second piston means is such that the total force on said first and second piston means is in the range of 5,360 to 7,520 pounds to draw an H19 aluminum alloy having a tensile strength in the range of 33,000 to 42,000

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US52167A 1970-07-06 1970-07-06 Drawing press pressure control Expired - Lifetime US3653301A (en)

Applications Claiming Priority (1)

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US5216770A 1970-07-06 1970-07-06

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US3653301A true US3653301A (en) 1972-04-04

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US52167A Expired - Lifetime US3653301A (en) 1970-07-06 1970-07-06 Drawing press pressure control

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US (1) US3653301A (enrdf_load_stackoverflow)
BE (1) BE769578A (enrdf_load_stackoverflow)
CA (1) CA931021A (enrdf_load_stackoverflow)
DE (1) DE2133522A1 (enrdf_load_stackoverflow)
GB (1) GB1303607A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799530A (en) * 1972-10-16 1974-03-26 H Stembridge Hydraulic cushion mechanism
US3815635A (en) * 1973-07-30 1974-06-11 Automatic Switch Co Temperature compensator device and fluidic assembly incorporating it
DE2704117A1 (de) * 1976-02-03 1977-08-04 Haustrups Fabriker As Verfahren zur herstellung einer im wesentlichen konischen dose aus duennem blech, und werkzeug zur durchfuehrung des verfahrens
US4599887A (en) * 1985-07-23 1986-07-15 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling dynamic characteristics of press load
US4669298A (en) * 1982-08-30 1987-06-02 Amada Company, Limited Press
US5964137A (en) * 1998-07-23 1999-10-12 Jung; William Emil Bantam twin pipe notcher
US20060260379A1 (en) * 2005-05-17 2006-11-23 Special Springs S.R.L. Apparatus for locking a sheet of metal suitable to be shaped in a press
US20110035907A1 (en) * 2002-11-29 2011-02-17 Martin Cousineau Hose Clamp

Families Citing this family (2)

* 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
FR2374105A1 (fr) * 1976-12-14 1978-07-13 Redicon Corp Presse de formage de recipients a double action

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1602411A (en) * 1924-02-09 1926-10-12 Marquette Tool & Mfg Co Die and blank holding means
US1773439A (en) * 1929-04-13 1930-08-19 Fredrich J Rode Cushioning device for drawing presses
US2584339A (en) * 1949-04-06 1952-02-05 Danly Mach Specialties Inc Hydropneumatic locking cushion for power presses
US3130963A (en) * 1961-11-20 1964-04-28 Harvey L Stegner Internally stabilized deep draw cushion for punch presses
US3447795A (en) * 1967-07-13 1969-06-03 Bliss Co Self-contained die cushion with air saver
US3451667A (en) * 1967-07-13 1969-06-24 Bliss Co Self-contained die cushion with air saver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1602411A (en) * 1924-02-09 1926-10-12 Marquette Tool & Mfg Co Die and blank holding means
US1773439A (en) * 1929-04-13 1930-08-19 Fredrich J Rode Cushioning device for drawing presses
US2584339A (en) * 1949-04-06 1952-02-05 Danly Mach Specialties Inc Hydropneumatic locking cushion for power presses
US3130963A (en) * 1961-11-20 1964-04-28 Harvey L Stegner Internally stabilized deep draw cushion for punch presses
US3447795A (en) * 1967-07-13 1969-06-03 Bliss Co Self-contained die cushion with air saver
US3451667A (en) * 1967-07-13 1969-06-24 Bliss Co Self-contained die cushion with air saver

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799530A (en) * 1972-10-16 1974-03-26 H Stembridge Hydraulic cushion mechanism
US3815635A (en) * 1973-07-30 1974-06-11 Automatic Switch Co Temperature compensator device and fluidic assembly incorporating it
DE2704117A1 (de) * 1976-02-03 1977-08-04 Haustrups Fabriker As Verfahren zur herstellung einer im wesentlichen konischen dose aus duennem blech, und werkzeug zur durchfuehrung des verfahrens
US4669298A (en) * 1982-08-30 1987-06-02 Amada Company, Limited Press
US4599887A (en) * 1985-07-23 1986-07-15 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling dynamic characteristics of press load
US5964137A (en) * 1998-07-23 1999-10-12 Jung; William Emil Bantam twin pipe notcher
US20110035907A1 (en) * 2002-11-29 2011-02-17 Martin Cousineau Hose Clamp
US20060260379A1 (en) * 2005-05-17 2006-11-23 Special Springs S.R.L. Apparatus for locking a sheet of metal suitable to be shaped in a press
US7260971B2 (en) * 2005-05-17 2007-08-28 Special Springs S.R.L. Apparatus for locking a sheet of metal suitable to be shaped in a press

Also Published As

Publication number Publication date
DE2133522A1 (de) 1972-01-27
BE769578A (fr) 1971-11-16
GB1303607A (enrdf_load_stackoverflow) 1973-01-17
CA931021A (en) 1973-07-31

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