US3531966A - Hydraulic press - Google Patents

Hydraulic press Download PDF

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Publication number
US3531966A
US3531966A US724107A US3531966DA US3531966A US 3531966 A US3531966 A US 3531966A US 724107 A US724107 A US 724107A US 3531966D A US3531966D A US 3531966DA US 3531966 A US3531966 A US 3531966A
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US
United States
Prior art keywords
cylinder
tray
press
fluid
cavity
Prior art date
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
Application number
US724107A
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English (en)
Inventor
Lambros Pappas
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.)
Allied Products Corp
Original Assignee
Verson Allsteel Press Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Verson Allsteel Press Co filed Critical Verson Allsteel Press Co
Application granted granted Critical
Publication of US3531966A publication Critical patent/US3531966A/en
Assigned to MARINE MIDLAND BANK(DELAWARE), NATIONAL ASSOCIATION reassignment MARINE MIDLAND BANK(DELAWARE), NATIONAL ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VERSON ALLSTEEL PRESS COMPANY, A CORP. OF DE.
Assigned to VERSON ALLSTEEL PRESS COMPANY, A CORP OF DE. reassignment VERSON ALLSTEEL PRESS COMPANY, A CORP OF DE. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MARINE MIDLAND BANK (DELAWARE) NATIONAL ASSOCIATION
Anticipated expiration legal-status Critical
Assigned to CONTINENTAL BANK N.A. AS AGENT reassignment CONTINENTAL BANK N.A. AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLIED PRODUCTS CORPORATION, A DE CORP.
Assigned to ALLIED PRODUCTS CORPORATION reassignment ALLIED PRODUCTS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VERSON ALLSTEEL PRESS COMPANY
Assigned to ALLIED PRODUCTS CORPORATION, A CORP. OF DELAWARE reassignment ALLIED PRODUCTS CORPORATION, A CORP. OF DELAWARE RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CONTINENTAL BANK N.A.
Assigned to CONTINENTAL BANK N.A. reassignment CONTINENTAL BANK N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLIED PRODUCTS CORPORATION
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure

Definitions

  • the present invention relates to a novel press, and more specifically to a novel hydraulic press.
  • cylindrical body means defining a cavity and a hydraulically expandable fluid cell or diaphragm disposed Within the cavity for engaging a workpiece disposed on a mold or form supported on a tray member and causing the workpiece to assume the shape of the form.
  • reaction forces which occur as the fluid cell or diaphragm is expanded and fills the cavity are absorbed and sustained by the outer cylinder or body means.
  • An important object of the present invention is to provide a novel hydraulic press structure of the above described type which is constructed for promoting more uniform distribution of reaction forces around the outer cylinder or body means and thereby minimizing any possibility of high stress concentrations and failure.
  • a more specific object of the present invention is to provide a novel hydraulic press of the above described type ⁇ wherein the outer cylindrical body means comprises a relatively heavy and rigid outer cylinder and means for transmitting reaction forces from the interior of the press hydraulically more uniformly around the interior of the cylinder. Still more specifically it is contemplated that the cylindrical body means of the press shall include an inner cylinder concentrically disposed with repsect to the outer cylinder with an annular space therebetween filled with hydraulic liquid for aiding in transmitting the reaction forces more uniformly to the outer cylinder.
  • FIG. 1 is a simplified perspective view showing a press incorporating features of the present invention
  • FIG. 2 is an end view of the press shown in FIG. 1;
  • FIG. 3 is an enlarged fragmnetary sectional view taken along line 3-3 in FIG. 1;
  • FIG. 4 is a fragmentary sectional view taken along line 4-4 in FIG. 3.
  • FIGS. 1 and 2 a press incorporating features of the present invention is shown in FIGS. 1 and 2.
  • the press comprises cylinder or body means 12 mounted on a suitable frame 14.
  • Table extensions 16 and 18 are located at opposite ends of the cylinder.
  • a work supporting tray 20 (see FIGS. 3 and 4) is adapted to be shifted from within the body means to retracted positions on the table extensions 16 and 18 for loading and unloading.
  • a suitable source of hydraulic fluid under pressure is provided for actuating the press.
  • this comprises a pump and motor unit 22 having an inlet connected with a reservoir 24 as shown schematically in FIGS. 2 and 4.
  • An outlet of the pump is connected with a control valve 26 which in turn has an outlet connected with a fluid supply line 28.
  • the control valve also has a vent port connected with a return line 30 which extends back to the reservoir 24.
  • the cylindrical body means 12 comprises an outer thick walled relatively rigid and strong cylinder member 32 and an inner cylinder 34.
  • the wall of the inner cylinder member 34 is relatively thin and resiliently yieldable as compared with the outer cylinder member for a purpose to be described below. It is to be noted that the cylinders are concentrically disposed and the outside diameter of the cylinder 34 is slightly less than the inside diameter of the cylinder 32 so that a narrow annular space 36 is defined between the cylinders.
  • Opposite end portions 38, only one of which is shown, of the inner cylinder 34- are enlarged for snugly fitting within the outer cylinder and 4closing opposite ends of the annular Space 36.
  • sealing rings 40 and 42 are provided between the outer cylinder and the enlarged end portions 38 of the inner cylinder so that the annular space 36 is effectively sealed and is adapted to receive and retain hydraulic fluid under pressure as will be described.
  • fluid passageways 44 and 46 are formed in the inner cylinder. These passageways connect with the annular space 36 and also with branch conduits 48 and 50 which in turn connect with the fluid supply line 28.
  • the cylindrical body means surrounds a cavity 52 into which the aforementioned tray 20 is adapted to be inserted.
  • a relatively thick and rigid floor casting 54 having an outer curved surface mating with the interior surface of the inner cylinder 34 fits within a lower portion of the cylinder and defines a floor for the cavity 52.
  • Bearing strips or rails 56 and 58 are mounted longitudinally of the floor casting S4 which extends for the entire length of the cylindrical members.
  • Spring biased rollers, not shown, of a known construction are mounted at opposite ends of the tray and ride on the rails 5'6 and 58 for facilitating movement of the tray 20 into and out of the cavity. These rollers normally raise the trays slightly above the bottom of the cavity, but collapse under the pressure applied to the tray during operation of the press so that the trays rest firmly against the bottom of the cavity in the manner shown.
  • a roof casting 60 similar to the floor casting 54 is disposed in and fixed against an upper portion of the inner cylinder 34 and a thick relatively rigid roof plate 62 is disposed beneath and in abutting relationship to the roof casting 60.
  • a thick relatively rigid roof plate 62 is disposed beneath and in abutting relationship to the roof casting 60.
  • an expandable fluid cell or bag 66 Disposed beneath and connected to the roof plate 62 is an expandable fluid cell or bag 66 having its lower face lined by a relatively thick tough rubber diaphragm 68.
  • the fluid cell is provided with an inlet port 70 which communicates with a fluid passageway 72 extending longitudinally of the roof plate 62 and connected by a branch conduit 74 with the fluid supply line 28 as shown in FIG. 4.
  • the fluid cell comprising the bag 66 and diaphragm 68 will be extended into the cavity 52 on the introduction of hydraulic fluid under pressure.
  • the action is such that the diaphragm engages the work and causes it to be pressed against and formed around the mold or form on -which it is supported in the tray 20.
  • the tray has a bottom section 76 and opposite diverging and upwardly extending side wall sections 78 and 80 as shown in FIG. 3.
  • the tray has opposite end wall sections 82, only one of which is shown in FIG. 4, so that the side and end walls define a recess 84 into which work to be processed or formed is placed.
  • Opposite side rail members 86 and 88 extend longitudinally the length of the cylinders between the opposite side walls of the tray and the inner cylinder 34 as shown in FIG. 3. These side rails extend ⁇ between the floor casting 54 and the diaphragm "68 and serve to support the diaphragm as well as to retain and guide the tray.
  • the rails have outer surfaces which are curved so as to mate with the inner surface of the cylinder 34.
  • the rails have lower inclined inner surface portions 90 and 92 parallel to the inclined outer surfaces of the tray opposite side walls 78 and 80.
  • Tray backup rails 91 and 93 extend for the full length of and are mounted on the side walls 78 and 80 for direct engagement with the surfaces 90 and 92 during operation of the press as described below.
  • the upper margin of the tray terminates well below the diaphragm when the diaphragm is in a retracted condition and portions of the side rails 86 and 88 extending above the tray have substantially perpendicular inner surface sections 94 and 98.
  • a sealing ring member 100 is provided.
  • This member has opposite side elements 102 and 104 with outer surfaces mating with the previously mentioned surfaces 94 and 98. Inner surfaces 106 and 107 of these side elements are beveled or inclined downwardly and inwardly as are the inner surfaces of the opposite side and end walls of the tray.
  • the sealing ring has opposite end portions 108, only one of which is shown in FIG. 4, also having downwardly and inwardly beveled inner surfaces 110. These end portions cooperate with thickened opposite end sections 112, only one of which is shown, of the roof plate 62 as shown in PIG. 4 for substantially closing the opposite ends of the work cavity.
  • a sealing strip or molding 114 is disposed between each end of the diaphragm 68 and each of the thickened end sections 112 of the roof plate, for retaining the diaphragm and cooperating with an adjacent end portion 108 of the sealing ring 100 in effectively sealing the opposite ends of the work cavity.
  • the reaction forces due to the hydrostatic forces within the fluid cell are transmitted primarily through the relatively thick and rigid roof and floor structures and the side rails 86 and 88 to the inside surface of the cylinder 34.
  • the tray absorbs the hydrostatic forces applied to its inside surface and restricts the forces from being transmitted outwardly to the cylinder.
  • the hydrostatic pressure within the fluid cell is unevenly transmitted to the inside surface of cylinder 34 due to the interaction of the internal structural components. This induces non-uniform stress distribution on the inside surface of cylinder 34 and tends to cause areas of high stress concentration.
  • the adverse effect of such uneven stress distribution is overcome by the dual coaxial cylinder structure.
  • the relatively thin inner cylinder 34 has a low flexural rigidity, allowing the Contact stress at its inner surface to be nearly uniform regardless of the different flexural rigidity of the mating parts.
  • This space 36 between the cylinders is as previously indicated connected with the fluid supply line 28.
  • the control valve 26 When the control valve 26 is operated to admit fluid under pressure to supply line 28 and thus expand and extend the diaphragm 68 for processing a workpiece, the pressure of the fluid in the annular chamber 36 is increased so as to substantially equal the pressure of the lluid within the diaphragm or fluid cell.
  • the outer cylinder 32 is subjected to a uniform hydrostatic pressure simultaneously with the fluid cell.
  • Hydrostatic pressure in the chamber 3-6 is applied over the full length of the internal pressurized zone provided by the fluid cell, and the pressure in chamber 36 equalizes thel internal pressure on cylinder 34.
  • the internal and external forces on cylinder 34 balance each other and the inner cylinder is in a state of near equilibrium.
  • a hydraulic press comprising body means defining a cavity and including inner and outer concentric continuous cylinders, a tray member removably disposed in said cavity for supporting work to be processed, resiliently expandable fluid pressure cell means mounted in said cavity opposite from said tray member for processing the work, a floor member supporting said tray member and having an outer arcuate surface mating with said inner cylinder, a roof structure supporting said cell means and having an outer surface mating with said inner cylinder, opposite side rail members between said floor member and said cell means and extending along opposite sides of said tray member and having outer arcuate surfaces mating with said inner cylinder, said body means including a substantially unobstructed cylindrical fluid pressure chamber means between said inner and outer cylinders, and continuously open fluid passageway means interconnecting said fluid cell means and said chamber means and being connectable with a common source of fluid under pressure for promoting the uniform distribution of reaction forces throughout and minimizing stress concentrations in said outer cylinder.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Clamps And Clips (AREA)
US724107A 1968-04-25 1968-04-25 Hydraulic press Expired - Lifetime US3531966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US72410768A 1968-04-25 1968-04-25

Publications (1)

Publication Number Publication Date
US3531966A true US3531966A (en) 1970-10-06

Family

ID=24909034

Family Applications (1)

Application Number Title Priority Date Filing Date
US724107A Expired - Lifetime US3531966A (en) 1968-04-25 1968-04-25 Hydraulic press

Country Status (12)

Country Link
US (1) US3531966A (da)
AT (1) AT286792B (da)
BE (1) BE722219A (da)
BR (1) BR6803467D0 (da)
CH (1) CH501494A (da)
DE (2) DE1919524C3 (da)
DK (1) DK137596B (da)
ES (1) ES359616A1 (da)
FR (1) FR1586799A (da)
GB (1) GB1175008A (da)
NL (1) NL6815534A (da)
SE (1) SE371965B (da)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852986A (en) * 1973-03-08 1974-12-10 Western Electric Co High pressure billet extruder
US4163378A (en) * 1977-06-27 1979-08-07 Asea Aktiebolag Hydraulic press
US4573335A (en) * 1984-01-20 1986-03-04 Asea Aktiebolag Hydraulic press with pressure cell
US20040050263A1 (en) * 2000-11-28 2004-03-18 Keijo Hellgren Press plant and a method and use for it with a pressure cell and a divisible tray
US20040065138A1 (en) * 2000-11-28 2004-04-08 Keijo Hellgren Hydraulic press with pressure cell with a tray whic consists of prestressed lamellas
US6779374B1 (en) * 2000-09-13 2004-08-24 Klune Industries, Inc. System and method for bulge forming a blank into an article including shaped portions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3403006C2 (de) * 1984-01-28 1986-03-06 Hoesch Ag, 4600 Dortmund Hydraulische Presse zum Verpressen von mit Glasfasern verstärkten Kunststoffmatten
SE451975B (sv) * 1986-03-04 1987-11-09 Asea Ab Press av tryckcelltyp samt forfarande for att byta membran i en sadan press

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US667525A (en) * 1900-06-08 1901-02-05 Carl Huber Internal-pressure-resistance cylinder.
US2848968A (en) * 1954-03-19 1958-08-26 John A Novak High pressure hydraulic press
US2962994A (en) * 1953-10-22 1960-12-06 Douglas Aircraft Co Inc High-pressure hydraulic press
US3379043A (en) * 1965-03-01 1968-04-23 Western Electric Co Pressure vessel for forming apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US667525A (en) * 1900-06-08 1901-02-05 Carl Huber Internal-pressure-resistance cylinder.
US2962994A (en) * 1953-10-22 1960-12-06 Douglas Aircraft Co Inc High-pressure hydraulic press
US2848968A (en) * 1954-03-19 1958-08-26 John A Novak High pressure hydraulic press
US3379043A (en) * 1965-03-01 1968-04-23 Western Electric Co Pressure vessel for forming apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852986A (en) * 1973-03-08 1974-12-10 Western Electric Co High pressure billet extruder
US4163378A (en) * 1977-06-27 1979-08-07 Asea Aktiebolag Hydraulic press
US4573335A (en) * 1984-01-20 1986-03-04 Asea Aktiebolag Hydraulic press with pressure cell
US6779374B1 (en) * 2000-09-13 2004-08-24 Klune Industries, Inc. System and method for bulge forming a blank into an article including shaped portions
US20040050263A1 (en) * 2000-11-28 2004-03-18 Keijo Hellgren Press plant and a method and use for it with a pressure cell and a divisible tray
US20040065138A1 (en) * 2000-11-28 2004-04-08 Keijo Hellgren Hydraulic press with pressure cell with a tray whic consists of prestressed lamellas
US7461531B2 (en) * 2000-11-28 2008-12-09 Avure Technologies Ab Press plant and a method and use for it with a pressure cell and a divisible tray

Also Published As

Publication number Publication date
DE1919524C3 (de) 1978-05-11
DK137596B (da) 1978-04-03
DE1919524B2 (de) 1977-09-01
SE371965B (da) 1974-12-09
FR1586799A (da) 1970-02-27
ES359616A1 (es) 1970-06-16
DE1919524A1 (de) 1969-11-13
DK137596C (da) 1978-09-18
AT286792B (de) 1970-12-28
BE722219A (da) 1969-03-14
DE6915394U (de) 1978-09-07
BR6803467D0 (pt) 1973-04-12
CH501494A (fr) 1971-01-15
NL6815534A (da) 1969-10-28
GB1175008A (en) 1969-12-23

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Legal Events

Date Code Title Description
PS Patent suit(s) filed
AS Assignment

Owner name: MARINE MIDLAND BANK(DELAWARE), NATIONAL ASSOCIATIO

Free format text: SECURITY INTEREST;ASSIGNOR:VERSON ALLSTEEL PRESS COMPANY, A CORP. OF DE.;REEL/FRAME:004456/0692

Effective date: 19850717

AS Assignment

Owner name: VERSON ALLSTEEL PRESS COMPANY, A CORP OF DE.

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MARINE MIDLAND BANK (DELAWARE) NATIONAL ASSOCIATION;REEL/FRAME:004553/0104

Effective date: 19860509

AS Assignment

Owner name: CONTINENTAL BANK N.A. AS AGENT

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIED PRODUCTS CORPORATION, A DE CORP.;REEL/FRAME:005270/0416

Effective date: 19891215

AS Assignment

Owner name: ALLIED PRODUCTS CORPORATION, ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VERSON ALLSTEEL PRESS COMPANY;REEL/FRAME:005238/0445

Effective date: 19900125

AS Assignment

Owner name: CONTINENTAL BANK N.A., ILLINOIS

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIED PRODUCTS CORPORATION;REEL/FRAME:005748/0940

Effective date: 19900124

Owner name: ALLIED PRODUCTS CORPORATION, A CORP. OF DELAWARE

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CONTINENTAL BANK N.A.;REEL/FRAME:005635/0117

Effective date: 19900124