US3396561A - Hydraulic die assembly for the forming of sheet material - Google Patents

Hydraulic die assembly for the forming of sheet material Download PDF

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Publication number
US3396561A
US3396561A US457010A US45701065A US3396561A US 3396561 A US3396561 A US 3396561A US 457010 A US457010 A US 457010A US 45701065 A US45701065 A US 45701065A US 3396561 A US3396561 A US 3396561A
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Prior art keywords
die
diaphragm
draw ring
hydraulic
die assembly
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US457010A
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English (en)
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Lawrence E Day
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Houdaille Industries Inc
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Houdaille Industries Inc
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Priority to US457010A priority Critical patent/US3396561A/en
Priority to SE6495/66A priority patent/SE301299B/xx
Priority to DE19661527989 priority patent/DE1527989A1/de
Priority to GB22179/66A priority patent/GB1095648A/en
Priority to FR62178A priority patent/FR1480570A/fr
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Publication of US3396561A publication Critical patent/US3396561A/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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/12—Stamping using yieldable or resilient pads using enclosed flexible chambers

Definitions

  • HYDRAULIC DIE ASSEMBLY FOR THE FORMING OF SHEET MATERIAL Filed May 19, 1965 5 Sheets-Sheet 5 a a v Q INVENTOR.
  • the die assembly includes an upper die, forming a downwardly opening die cavity and having a marginal plane downwardly facing surface; a floating draw ring having a cylindrical bore opening toward said die cavity and having a marginal upwardly facing plane surface confronting that of the die; a stationary piston in the bore; a flexible diaphragm secured to the top of the draw ring, extending over the bore opening and clamped between said confronting plane surfaces; and a pressure transmitting hydraulic fluid confined in said bore between said piston and said diaphragm and in contact with both thereof; whereby with sheet material clamped between said confronting plane surfaces between said diaphragm and said die cavity opening, fluid pressure is transmitted through said diaphragm to stretch and shape said sheet material to the form of said die cavity.
  • This invention relates to an hydraulic die assembly for installation in a conventional press for the hydraulic forming of sheet material such as metal. More particularly, the invention relates to a die assembly that includes a flexible or distensible wall through which hydraulic pressure is transmitted to draw a work blank to the desired shape.
  • Existing presses such as are used in the drawing or shaping of sheets of metal and other materials can be rather simply and inexpensively adapted for the hydraulic shaping of such sheets by the installation in such presses of the hydraulic die assembly of my invention.
  • FIGURE 1 is a top plan view with parts broken away, of the left half of the lower portion of an hydraulic die assembly embodying the principles of my invention
  • FIGURE 2 is a cross-sectional view, with parts in elevation, taken substantially along the line IIlI of FIG- URE 1 but with the upper portion of the die assembly in cooperative relationship with the lower portion for the hydraulic forming of a work piece;
  • FIGURE 3 is a cross-sectional view taken substantially along the line III--III of FIGURE 2, with parts shown in elevation;
  • FIGURE 4 is a vertical sectional view, similar to FIG- "ice URE 3, illustrating the relationship of the parts of the die assembly prior to the closing of the press;
  • FIGURE 5 is a fragmentary sectional view, similar to that of FIGURE 3, illustrating the position of the flexible or distensible wall of the hydraulic die at an intermediate stage of the forming operation;
  • FIGURE 6 is a vertical sectional view, generally similar to FIGURE 2 but illustrating a modification of my hydraulic die assembly for use in forming shapes having a reentrant end contour.
  • the reference numeral 10 indicates generally an hydraulic die assembly embodying the principles of my invention. Said hydraulic die assembly 10 is adapted to be installed in an existing press between an upper press ram 11 and a lower bolster 212, both of which are illustrated in FIG. 3 rather schematically and fragmentarily.
  • the hydraulic die assembly of my invention can be used with various types of equipment, both verticaland horizontalacting, that include relatively movable, power-operated members similar in nature and operation to the press ram, or punch, and the bolster, or lbed-plate, of a conventional punch press.
  • power requirements of the press or other similar equipment that may be used with my hydraulic die assembly, this, of course, will vary in accordance with the particular sheet material to be shaped and the magnitude of the forces required to form the desired shape.
  • presses of 1600 tons capacity or over would typically be required for the shaping operations.
  • the press ram 11 carries at its lower end a punch shoe 12, in which is mounted a die 13, hereinafter sometimes referred to as the upper die.
  • the die 13 is mounted in a downwardly facing recess 14 in the lower face of the punch shoe 12, the die 13 being held in said recess in part by force-fitting shims 15 and in part by wedging members and bolt means 68 later to be described.
  • Said die 13 is provided with a downwardly opening cavity 16, the forming walls 17 of which are of the desired contour and dimensions to impart to a blank, indicated by the reference numeral 18 (FIG. 4), the shape to which it is to be formed.
  • the die assembly 10 includes a lower die shoe v19, herein termed a draw ring holder, which is positioned on and bottomed against the bolster 212.
  • Said bolster 212 is provided with a plurality of bores 20, and the draw ring holder 19 is provided with other bores 21 aligned with said bores 20 for the passage therethrough of transfer pins 22, sometimes called air pins.
  • Said pins 22 abut at their lower ends against a pad 23 arranged for vertical movement within a chamber 24 formed beneath a bolster 212 in an air pad device 25.
  • the pad 23 is supported by air, or other gas or oil, or a combination of air and hydraulic media, maintained under pressure within an extension of the chamber 24 below the air pad 23.
  • the pressure, whether hydraulic, pneumatic, or a combination of the two, maintained within the extension of the chamber 24 below the air pad 23 will generally be a constant pressure, but one capable of adjustment, either automatically or manually.
  • the draw ring 26, or floating ring as it is sometimes termed herein, is carried upon the upper ends of the pins 22. As illustrated, said draw ring 26 has lower side flanges 27 that rest against the upper ends of said pins 22.
  • the pins 22 are not attached at either end but are merely freely received in and guided by the continuous bores provided by the aligned bores and 21.
  • Said draw ring 26 is provided along a longitudinal median line with a plurality of relatively large diameter, central bores 31 (three in number, as illustrated) that are preferably cylindrical and that extend vertically completely through the draw ring 26.
  • the draw ring 26 is illustrated as having a total in all of seven bores of which said three central bores 31 are identical in all respects.
  • the other bores, 32 and 32a are arranged outwardly of the bores '31, :one group being shown in FIGS. 1 and 2 on the left side of the draw ring.
  • the bores 32 and 32a are of a different size and arrangement from the bores 31 for a purpose that will later on appear. Inasmuch as each of the three bores 31 is identical, Only one need be described herein.
  • the bore 31 therein illustrated has a lower, enlarged cylindrical portion 33 into which is snugly fitted a cylinder sleeve 34.
  • a retaining ring 35 suitably secured to the underside of the draw ring 26 and interfitting with the lower shouldered end of the cylinder sleeve 34, as at 37, serves to retain said sleeve in the bore portion 33.
  • a stationary piston 36 closes the lower open end of the cylinder sleeve 34.
  • each of the pistons 36 is provided with an annular groove 38, into which extends with clearance, an annular inturned flange 39 provided on a retaining ring 40.
  • Said retaining ring 40 is suitably secured to the upper surface of the draw ring holder 19 by plates 41 and by other means, not shown.
  • a slight amount of clearance is provided between the inturned flange 39 and the corresponding wall of the piston groove 38, and, additionally, the piston 36 is so mounted that even though it is essentially a stationary piston and is so described, it is self-aligning with respect to the axis of the co-axial cylinder sleeve 34.
  • each piston 36 with a lower segmental spherical convex surface 42 and providing a conforming concave surface 43 on a seating disc 44 mounted therebelow in an oversized cylindrical recess 45 formed in the draw ring holder 19.
  • the draw ring 26 is provided with a recess or groove 46 in the upper surface 47 of said draw ring for receiving the reinforced peripheral edge 48 of a flexible and/ or distensible diaphragm 49.
  • Said groove 46 lies outside of and includes the several through-bores 31, 32 and 32a so that said diaphragm 49 extends completely across the open upper ends of said bores and also, of course, spans the projected opening of the die cavity 16 in the upper die 13.
  • the diaphragm 49 may be made of rubber or other suitable elastic material, but it need not be elastic so long as it is sufiiciently flexible to conform to the die cavity wall contour.
  • the peripheral edge 48 of said diaphragm 49 is provided with a mounting ring 50 of hard rubber, steel, or other hard composition in the form of an endless strip, preferably rectangular in cross-section, around three sides of which, including the underside, the peripheral margin 48 of the diaphragm 49 is wrapped and, preferably, to which said peripheral margin is bonded.
  • the thus reinforced periphery 48 of the diaphragm 49 is positioned and held in the receiving groove 46, and prefera-bly locked therein by means of bolts 150 threaded into the mounting ring 50 with their headed ends retained in countersink 151 in the draw ring 26.
  • Each of the bores 31, 32 and 32a forms a receptacle above the corresponding piston 36 that is open at the top except for the diaphragm 49 and the receptacles so formed are in open flow communication with each other beneath the diaphragm 49.
  • An hydraulic fluid, indicated generally by the reference numeral 51, during normal operation of my hydraulic die assembly substantially fills all of the space below the diaphragm 49, including the bores 31, 32 and 32a and, the diaphragm permitting it, the space thereabove connecting the upper open ends of the bores. For clarity, the hydraulic fluid has not been shown in some figures of the drawings.
  • the hydraulic fluid may suitably be oil or any other fluid normally liquid at room and operating temperatures.
  • Means for introducing an hydraulic liquid into the draw ring 2 6 include one or more feed lines 52 connected through a coupling and nipple assembly 53 to a passageway 54 in the wall of the draw ring 26 that opens into a bore 31 or 32.
  • feed lines 52 connected through a coupling and nipple assembly 53 to a passageway 54 in the wall of the draw ring 26 that opens into a bore 31 or 32.
  • means are provided for carrying off the surplus hydraulic fluid and also any air or other gas that might be entrapped beneath the diaphragm 49.
  • Such means include tubing 55 having an upturned angular portion 56 open at its upper end 57.
  • Said tubing 55 is connected through suitable couplings 58 to an outer discharge line 59.
  • Means 60 serve to seal the outer end of the passageway 61 provided in the wall of the draw ring 26 for the hydraulic fluid and gas venting means.
  • the upper open end 57 of the venting tubing 55 is so positioned as to be approximately at the level of the upper open end of each bore so that with the diaphragm 49 at rest, the mid-portion of the diaphragm drapes over said upper open end 57. This insures suflicient hydraulic fluid in the system to operate properly and at the same time insures the venting of any surplus of the hydraulic fluid and any air or gas that may have collected under the diaphragm 49.
  • the punch shoe 12 has already been described as having a recess 14 in which the upper die 13 is mounted.
  • the securement of the upper die 13 in said recess 14 is accomplished in part by wedge-shaped members 65 at the ends of said die 13, which wedgedshaped members 65 are adapted to be drawn into tight wedging engagement with confronting surfaces 66 and 67, respectively, of the die 13 and the punch shoe 12 by bolts 68.
  • Another feature of construction that seems to require no detailed discussion is the provision of coacting wear plates 69 and 70 for accommodating relative sliding vertical movement between the draw ring 26 and its holder 19.
  • the floating draw ring 26 is supported at its ends by pins, similar to the transfer pins already described, that lie along a longitudinal median plane of the die assembly.
  • Said pin 71 like the pins 22 abut at their lower ends the air pad 23 and extend into supporting relation with the draw ring 26.
  • the upper ends of said pin 71 pass through sleeves 72 inserted in corresponding bores in the lower wall of the draw ring holder 19, with the upper extremities of said pins extending into recesses in the lower surface of a plate 73 on the underside of the draw ring 26.
  • the dotted lines 74 (FIGS. 1 and 2) represent merely cavities in the casting forming the floating draw ring and serve to reduce the total overall weight of the ring.
  • each of said pistons 36 is provided with an annular outer groove at its upper end for reception of a seal ring 91.
  • the hydraulic die assembly of FIG. 6 comprises a punch shoe 103 per-forming the same function as the punch shoe 12 but of different form and construction to cooperate with an upper sectional die 104 of diflerent form and construction from the die 14.
  • Said die 104 comprises an intermediate section 105 and a pair of end sections 106. Since each of the end sections 106 is a reverse image of the other, only one need be described.
  • the end 106 shown in FIG. 6 has an inner slanting face 107 adapted to abut against a similarly slanting face 108 of the intermediate die section 105 when the assembly is in its operative relationship. This is brought about by a cam action later to be described.
  • the punch shoe 103 When the press ram is in its raised position, the punch shoe 103 is also raised to a position spaced above draw ring 120, and the end section 106 is at that stage moved outwardly by means including an air cylinder schematically indicated by the reference numeral 109.
  • Said air cylinder is suitably carried in a recessed portion of the underside of the punch shoe 103 and includes a piston (not shown) attached to a rod 110 projecting from the outer end of said cylinder 109.
  • Said rod 110 is connected at its outer end to a dog 111 slidably mounted in a guideway or gib 112.
  • Said dog 111 has a dependent portion 113 which engages in a corresponding recess in o the upper portion of the corresponding die end section 106 to move the same from its assembled relationship with the intermediate die portion 105, as illustrated in FIG. 6, to an extreme left-hand position (as viewed in FIG. 6) determined by the length of travel of the piston in the air cylinder 109. While not illustrated, it will be understood that the die end section 106 is moved by the operation of the air cylinder 109 to its extreme lefthand position only when the press is open and the draw ring, indicated generally by the reference numeral 120 is separated from the upper sectional die 104 by a distance sufficient to make possible this movement of the die end section 106.
  • the lower die shoe 114 has upstanding end flanges 115, of which only one is illustrated. Each of said end flanges 115 is provided along its inner surface with an upper outwardly angled guide or slide plate 116 and with an inner vertical guide or slide plate 117.
  • the die end section 106 is provided with an upper vertically arranged guide or slide plate 118 for sliding movement relative to the plate 117, and with a lower inwardly angled guide or slide plate 119 for camming coaction with said guide plate 116.
  • the guide plates 119 first first come into contact with the guide plates 116 at the start of such closing movement and due to the angular relationship of said guide plates, the die end section 106 is moved inwardly toward the intermediate die section 105.
  • said punch shoe is provided with a dependent flange 124 at each end, on the inside surface of which is positioned a vertical wear or guide plate 125 for relatively sliding movement in contact with a similar vertical wear or guide plate 126 positioned on the outer end of each of the flanges 115.
  • a vertical wear or guide plate 125 for relatively sliding movement in contact with a similar vertical wear or guide plate 126 positioned on the outer end of each of the flanges 115.
  • the diaphragm indicated generally by the reference numeral 130 except for size and shape is the same as the diaphragm 49 that has previously been described.
  • Said diaphragm 130 is also similarly provided with a reinforced peripheral edge 131 that includes an endless band or ring 132 of hard rubber, steel, or composition material, to which the margin of the diaphragm is suitably bonded.
  • the draw ring 120 is provided with an outer peripheral groove 133 against the lower and inner walls of which said diaphragm periphery 131 is held.
  • a hold-down pressure is exerted against said reinforced periphery 131 when the die end sections 106 are moved inwardly, or toward one another, since after completion of such movement, an inner wall surface 135 on each of said die ends engages the margin 136 of the work piece 100 and exerts pressure therethrough against said reinforced diaphragm margin 131.
  • the diaphragm 49 may be of any suitable flexible and distensible sheet material, it is prefer-ably formed of rubber, either natural or synthetic, and typically has a Durometer B reading of around 50. In general, it is sufficient if the diaphragm has the ability to stretch in all directions by at least 20% of its original dimensions.
  • the diaphragm need not be elastic but is preferably capable of returning to substantially its original state after being distended or flexed.
  • the mounting ring 50 that serves to reinforce the periphery 48 of the diaphragm is formed of rubber, either natural or synthetic, a hard rubber is used having preferably a Durometer B reading in the neighborhood of 75.
  • the mounting ring or strip 50 is preferably bonded to the margin of the diaphragm 49 throughout its extent to facilitate the handling of the diaphragm as a unit. As previously stated, the diaphragm is preferably locked in place.
  • An hydraulic die assembly adapted to be mounted between a press bolster and a press rarn for the hydraulic forming of sheet material, said die assembly comprising:
  • a floating draw ring mounted in said holder and having a cylinder bore therein opening toward said die cavity
  • An hydraulic die assembly adapted to be mounted between two members relatively movable toward and away from each other for the hydraulic forming of sheet material, said die assembly comprising a die cavity forming means associated with one of said members with the die cavity opening toward the other of said members and with a marginal downwardly facing plane surface,
  • a floating draw ring mounted in said holder and having a bore therein extending therethrou-gh a marginal upwardly facing plane surface confronting said downwardly facing plane surface
  • said die cavity forming means and said floating ring upon movement of said members toward each other being first brought into assembled relation with said diaphragm therebetween and upon continued movement of said members toward each other, said hydraulic fluid being placed under pressure against said diaphragm to flex the same into forming relation to said die cavity whereby, with sheet material clamped between said downwardly and upwardly confronting plane surfaces and with such sheet material between said diaphragm and said die cavity opening, fluid pressure is transmitted through said diaphragm to stretch and shape such sheet material to the form of said die cavity.
  • said automatic aligning means include mating segmental spherical surfaces between the confronting portions of said piston and said draw ring holder.
  • air cushion means are provided for floating said draw ring.
  • said air cushion means include pins floating said draw ring
  • An hydraulic die assembly for use with a conventional press between an upper punch ram and a lower bolster against which the die assembly is bottomed upon closure of the press thereby adapting the press to the forming of a work blank by hydraulic pressure applied to the blank through a flexible wall, said die assembly comprising:
  • said draw ring having a bore therethrough the lower portion thereof providing a cylinder
  • venting means include a tube passing through the wall of said bore and having an upper open end near the top of said bore and against which said diaphragm can rest when not distended by pressure thereon.
  • An hydraulic die assembly for association with a conventional press including an upper press punch ram and a lower stationary bolster towards which said ram is movable upon closure of said press, thereby adapting said press to the forming of a work blank by hydraulic pressure transmitted to the work blank through a flexible distensible diaphragm, said die assembly comprising:
  • said draw ring has a continuous groove in an upper surface thereof enclosing all of said bores and said diaphragm has a reinforced peripheral edge mounted in said groove and adapted to be held therein by the pressure exerted by said first mentioned means against said peripheral edge during closing of said press.
  • An hydraulic die assembly as defined by claim 16 wherein means including a tubing opening beneath said dia- 1 l 1 2 phragm in said bore near the top thereof are pro- References Cited llrigggeogirventing surplus hydraulic fluid and en- UNITED STATES TS
US457010A 1965-05-19 1965-05-19 Hydraulic die assembly for the forming of sheet material Expired - Lifetime US3396561A (en)

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Application Number Priority Date Filing Date Title
US457010A US3396561A (en) 1965-05-19 1965-05-19 Hydraulic die assembly for the forming of sheet material
SE6495/66A SE301299B (xx) 1965-05-19 1966-05-11
DE19661527989 DE1527989A1 (de) 1965-05-19 1966-05-18 Hydraulisches Gesenk
GB22179/66A GB1095648A (en) 1965-05-19 1966-05-18 Improvements in or relating to die assemblies for the hydraulic forming of sheet material
FR62178A FR1480570A (fr) 1965-05-19 1966-05-18 Matrice hydraulique comportant une paroi souple transmettant la pression pour mettre en forme une ébauche en tôle

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US457010A US3396561A (en) 1965-05-19 1965-05-19 Hydraulic die assembly for the forming of sheet material

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US3396561A true US3396561A (en) 1968-08-13

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DE (1) DE1527989A1 (xx)
FR (1) FR1480570A (xx)
GB (1) GB1095648A (xx)
SE (1) SE301299B (xx)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635061A (en) * 1968-12-09 1972-01-18 Saab Ab Forming apparatus for hydraulic press
US3636061A (en) * 1969-11-21 1972-01-18 Olin Corp Forming apparatus for hydraulic press
US3670546A (en) * 1968-12-05 1972-06-20 Jose Luis De La Sierra Fluid press
US4658618A (en) * 1985-02-06 1987-04-21 Asea Aktiebolag Forming press of the pressure cell type
WO1991008065A1 (en) * 1989-11-29 1991-06-13 Graph-Tech, Inc. Apparatus and method for hydroforming sheet metal
US5865054A (en) * 1989-08-24 1999-02-02 Aquaform Inc. Apparatus and method for forming a tubular frame member
US7658196B2 (en) 2005-02-24 2010-02-09 Ethicon Endo-Surgery, Inc. System and method for determining implanted device orientation
US7775966B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. Non-invasive pressure measurement in a fluid adjustable restrictive device
US7775215B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. System and method for determining implanted device positioning and obtaining pressure data
US7844342B2 (en) 2008-02-07 2010-11-30 Ethicon Endo-Surgery, Inc. Powering implantable restriction systems using light
US7927270B2 (en) 2005-02-24 2011-04-19 Ethicon Endo-Surgery, Inc. External mechanical pressure sensor for gastric band pressure measurements
US8016745B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. Monitoring of a food intake restriction device
US8016744B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. External pressure-based gastric band adjustment system and method
US8034065B2 (en) 2008-02-26 2011-10-11 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
US8057492B2 (en) 2008-02-12 2011-11-15 Ethicon Endo-Surgery, Inc. Automatically adjusting band system with MEMS pump
US8066629B2 (en) 2005-02-24 2011-11-29 Ethicon Endo-Surgery, Inc. Apparatus for adjustment and sensing of gastric band pressure
US8100870B2 (en) 2007-12-14 2012-01-24 Ethicon Endo-Surgery, Inc. Adjustable height gastric restriction devices and methods
US8114345B2 (en) 2008-02-08 2012-02-14 Ethicon Endo-Surgery, Inc. System and method of sterilizing an implantable medical device
US8142452B2 (en) 2007-12-27 2012-03-27 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
US8152710B2 (en) 2006-04-06 2012-04-10 Ethicon Endo-Surgery, Inc. Physiological parameter analysis for an implantable restriction device and a data logger
US8187162B2 (en) 2008-03-06 2012-05-29 Ethicon Endo-Surgery, Inc. Reorientation port
US8187163B2 (en) 2007-12-10 2012-05-29 Ethicon Endo-Surgery, Inc. Methods for implanting a gastric restriction device
US8192350B2 (en) 2008-01-28 2012-06-05 Ethicon Endo-Surgery, Inc. Methods and devices for measuring impedance in a gastric restriction system
US8221439B2 (en) 2008-02-07 2012-07-17 Ethicon Endo-Surgery, Inc. Powering implantable restriction systems using kinetic motion
US8233995B2 (en) 2008-03-06 2012-07-31 Ethicon Endo-Surgery, Inc. System and method of aligning an implantable antenna
US8337389B2 (en) 2008-01-28 2012-12-25 Ethicon Endo-Surgery, Inc. Methods and devices for diagnosing performance of a gastric restriction system
US8377079B2 (en) 2007-12-27 2013-02-19 Ethicon Endo-Surgery, Inc. Constant force mechanisms for regulating restriction devices
US8591532B2 (en) 2008-02-12 2013-11-26 Ethicon Endo-Sugery, Inc. Automatically adjusting band system
US8591395B2 (en) 2008-01-28 2013-11-26 Ethicon Endo-Surgery, Inc. Gastric restriction device data handling devices and methods
US8870742B2 (en) 2006-04-06 2014-10-28 Ethicon Endo-Surgery, Inc. GUI for an implantable restriction device and a data logger
CN107695156A (zh) * 2017-10-13 2018-02-16 天津航天长征火箭制造有限公司 一种Ф3350mm椭球瓜瓣法向孔凸孔模具及工艺
CN116984467A (zh) * 2023-09-26 2023-11-03 合肥工业大学 一种超薄金属极板超声辅助精确成形方法

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US2317869A (en) * 1941-04-15 1943-04-27 Lewis E Walton Combination hydraulic and rubber die
US2786728A (en) * 1954-01-29 1957-03-26 Malkin Inc Display cabinet

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Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670546A (en) * 1968-12-05 1972-06-20 Jose Luis De La Sierra Fluid press
US3635061A (en) * 1968-12-09 1972-01-18 Saab Ab Forming apparatus for hydraulic press
US3636061A (en) * 1969-11-21 1972-01-18 Olin Corp Forming apparatus for hydraulic press
US4658618A (en) * 1985-02-06 1987-04-21 Asea Aktiebolag Forming press of the pressure cell type
US5865054A (en) * 1989-08-24 1999-02-02 Aquaform Inc. Apparatus and method for forming a tubular frame member
WO1991008065A1 (en) * 1989-11-29 1991-06-13 Graph-Tech, Inc. Apparatus and method for hydroforming sheet metal
US5157969A (en) * 1989-11-29 1992-10-27 Armco Steel Co., L.P. Apparatus and method for hydroforming sheet metal
US5372026A (en) * 1989-11-29 1994-12-13 Armco Steel Company Apparatus and method for hydroforming sheet metal
US7658196B2 (en) 2005-02-24 2010-02-09 Ethicon Endo-Surgery, Inc. System and method for determining implanted device orientation
US7775966B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. Non-invasive pressure measurement in a fluid adjustable restrictive device
US7775215B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. System and method for determining implanted device positioning and obtaining pressure data
US7927270B2 (en) 2005-02-24 2011-04-19 Ethicon Endo-Surgery, Inc. External mechanical pressure sensor for gastric band pressure measurements
US8016745B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. Monitoring of a food intake restriction device
US8016744B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. External pressure-based gastric band adjustment system and method
US8066629B2 (en) 2005-02-24 2011-11-29 Ethicon Endo-Surgery, Inc. Apparatus for adjustment and sensing of gastric band pressure
US8870742B2 (en) 2006-04-06 2014-10-28 Ethicon Endo-Surgery, Inc. GUI for an implantable restriction device and a data logger
US8152710B2 (en) 2006-04-06 2012-04-10 Ethicon Endo-Surgery, Inc. Physiological parameter analysis for an implantable restriction device and a data logger
US8187163B2 (en) 2007-12-10 2012-05-29 Ethicon Endo-Surgery, Inc. Methods for implanting a gastric restriction device
US8100870B2 (en) 2007-12-14 2012-01-24 Ethicon Endo-Surgery, Inc. Adjustable height gastric restriction devices and methods
US8142452B2 (en) 2007-12-27 2012-03-27 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
US8377079B2 (en) 2007-12-27 2013-02-19 Ethicon Endo-Surgery, Inc. Constant force mechanisms for regulating restriction devices
US8192350B2 (en) 2008-01-28 2012-06-05 Ethicon Endo-Surgery, Inc. Methods and devices for measuring impedance in a gastric restriction system
US8591395B2 (en) 2008-01-28 2013-11-26 Ethicon Endo-Surgery, Inc. Gastric restriction device data handling devices and methods
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CN116984467B (zh) * 2023-09-26 2023-12-15 合肥工业大学 一种超薄金属极板超声辅助精确成形方法

Also Published As

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SE301299B (xx) 1968-06-04
GB1095648A (en) 1967-12-20
FR1480570A (fr) 1967-05-12
DE1527989A1 (de) 1969-08-28

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