US3527076A - Press stand - Google Patents

Press stand Download PDF

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Publication number
US3527076A
US3527076A US719545A US3527076DA US3527076A US 3527076 A US3527076 A US 3527076A US 719545 A US719545 A US 719545A US 3527076D A US3527076D A US 3527076DA US 3527076 A US3527076 A US 3527076A
Authority
US
United States
Prior art keywords
spacers
press stand
yokes
press
operating space
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
US719545A
Other languages
English (en)
Inventor
Torstein Landa
Stig Johnsson
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US3527076A publication Critical patent/US3527076A/en
Anticipated expiration legal-status Critical
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides
    • B30B15/042—Prestressed frames

Definitions

  • the present invention relates to a press stand with a very large working surface, particularly for forming very long objects from sheet metal by means of a diaphragm influenced by a pressure medium, which presses the metal against a form block to give the metal the desired shape. Press stands of this type are often used in the aviation industry to shape aeroplane parts.
  • the press stand according to the invention is constructed of two yokes and at least two spacers which keep these yokes at a certain distance from each other so that these elements form the operating space of the press and provide a frame around which a sheath of Wire or narrow steel strip can be wound under prestress to absorb the pressure forces.
  • the press stand is characterised in that the surfaces of both the yokes and the spacers are at least partly curved. As a rule it is suitable for the yokes and spacers to have the same and constant radius of curvature so that together they form a cylinder.
  • the operating space has a substantially rectangular cross section perpendicular to the longitudinal axis of the press stand.
  • the yokes are provided with longitudinal guides which nace;
  • the guides also substantially absorb the inwardly directed forces with which the pre-stressed strip sheath inlluences the spacers due to the fact that they have outwardly curved surfaces.
  • the spacers are normally made longer than the distance between the yokes and stops are arranged in the yoke material itself.
  • guides having some other design are also feasible. From the manufacturing point of view it is simplest to provide the spacers with parallel surfaces, but in certain cases it may be suitable from the pressure point of view to have oblique abutment surfaces so that the spacers are substantially wedge-shaped in such a way that the point of the wedge lies on the inside of the spacer somewhere past the centre line of the press stand. The spacer is thus narrowest nearest the operating space.
  • the yoke guides are so positioned and the spacers so shaped that the inner corners of the spacers abut the guides.
  • press stands In very long press stands it may be suitable both from the manufacturing and the transportation points of View to assembly the press stand from two or more parts at the place where it is to be used.
  • a press stand is obtained in which the pressure forces are absorbed in an extremely advantageous manner. Furthermore, welding is avoided which lowers the strength of the sheath.
  • the stress concentration in the inner part of the load-absorbing sheath can simply be eliminated if the wire or tape in the various layers of the sheath is given suitable tension when it is wound on. If the pre-stressing is chosen so that the tension in all the layers of the sheath is approximately equal when the press is subjected to full load, the construction material will be particularly effectively used. It is also possible to use material with greater strength in wire or tape sheaths than can be used in sheaths constructed from sheet metal or tubes.
  • press stands having working surfaces of a certain size and a certain pressure it is possible for press stands having working surfaces of a certain size and a certain pressure to be made smaller than previously and also to manufacture press stands much larger and having greater pressure than was previously thought feasible.
  • the spacers are shaped with outwardly curved surfaces, the press stand can absorb forces in two planes perpendicular to each other, which involves considerable advantages for presses of the type in question.
  • the circular shape has great advantages during the manufacture, particular with the great lengths of the press stand which are usual for presses of this type.
  • FIG. 1 shows partly in side view and partly a longitudinal section of the press stand.
  • FIG. 2 shows a section through a press stand With circular cross section.
  • FIG. 3 shows an end view of an embodiment having different external radii of curvature for the yokes and the spacers.
  • FIG. 1 and 2 designate yokes and 3 and 4 spacers.
  • the yokes are designed with stops 5 and the spacers with guide surfaces 6 at their inner corners to t these stops.
  • the spacers 3 have parallel limiting surfaces 7 while the spacers 4 have oblique limiting surfaces 8 so that the spacers are wedge-shaped.
  • 9 are guide pins which position yokes and spacers in relation to each other, especially during machining of the external surfaces onto which the tape sheath 10 is wound.
  • the steel strip is wound on under tension which, with thick sheaths usually varies from layer to layer.
  • Both the yokes and 3 spacers are provided with flanges 11, 12 and 13, 14, respectively.
  • the press stand according to FIG. 2 has a circular cross section while the press stand according to FIG. 3 has an oval cross section.
  • the yoke 2 has an external radius R1, While the spacers have an external radius R2 R1.
  • the spacers 3 have a curved internal surface 15 while the spacers 4 have a flat internal surface 16.
  • Working pieces to be moulded are placed on form blocks on a carriage 17 which can be inserted into the operating space.
  • a holder 18 In the upper part of the operating space is a holder 18 in which is attached a diaphragm with a sealing layer 19 and an elastomeric pad 20.
  • the pressure medium which inuences the diaphragm when forming the sheet metal placed on form blocks on the carriage 17 is introduced into a space above the diaphragm through channels 21 in the holder 18 and the channels 21 in the connection piece 23.
  • the press stand rests on a base 24.
  • the press stand may, for example, have an elliptical shape. If it is to absorb forces directed in two planes perpendicular to each other, it may be suitable to choose a shape designed to take up the forces in the different planes so that the forces are absorbed in the most favourable manner. If extremely long operating space is required a press stand is assembled from a number of press units as shown in the drawing, which are put together in a suitable manner. Oil need not be supplied through channels in the holder 18. In certain cases it may instead be suitable to provide oil channels in the upper yoke.
  • Press stand comprising two yokes and at least two spacers between the yokes defining therewith an operating space and a pre-stressed sheath of elongated metallic material surrounding the yokes and spacers and engaging outer surfaces thereof, characterized in that the said outer surfaces of both the yokes and the spacers are at least partly convexly curved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Presses And Accessory Devices Thereof (AREA)
US719545A 1967-04-14 1968-04-08 Press stand Expired - Lifetime US3527076A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE05190/67A SE369869B (enExample) 1967-04-14 1967-04-14

Publications (1)

Publication Number Publication Date
US3527076A true US3527076A (en) 1970-09-08

Family

ID=20265895

Family Applications (1)

Application Number Title Priority Date Filing Date
US719545A Expired - Lifetime US3527076A (en) 1967-04-14 1968-04-08 Press stand

Country Status (6)

Country Link
US (1) US3527076A (enExample)
JP (1) JPS504908B1 (enExample)
DE (1) DE1752093B2 (enExample)
FR (1) FR1569057A (enExample)
GB (1) GB1212104A (enExample)
SE (1) SE369869B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805584A (en) * 1972-01-03 1974-04-23 Asea Ab Press with a pre-stressed press stand
US4163378A (en) * 1977-06-27 1979-08-07 Asea Aktiebolag Hydraulic press
EP1008438B2 (en) † 1998-12-09 2009-11-25 System S.p.A. A structure for presses, in particular for forming ceramic products

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19607257C2 (de) * 1996-02-27 1999-11-04 Hydrap Pressen Maschinenbau Hydraulische Blechformpresse
CN101982251B (zh) * 2010-09-09 2013-01-16 清华大学 一种承受多向载荷的预应力钢丝缠绕预紧机架

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2335038A (en) * 1940-11-01 1943-11-23 Projectile & Engineering Compa Wire reinforcement
US2600630A (en) * 1946-01-22 1952-06-17 Fergusson Hugh Boscawen Construction of thick-walled high-pressure vessels
US2984379A (en) * 1956-07-27 1961-05-16 Csepel Vas Es Femmuvek Transport of industrial gases on rolling stock
US3120205A (en) * 1956-02-07 1964-02-04 Gen Tire & Rubber Co Forming pad for hydraulic press

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1055958B (de) 1955-03-18 1959-04-23 Asea Ab Pressenstaender
CH343795A (de) 1955-03-18 1959-12-31 Asea Ab Ständer, insbesondere für hydraulische Pressen
GB801072A (en) 1956-02-07 1958-09-10 Gen Tire & Rubber Co Hydraulic press
DE1052816B (de) 1956-02-17 1959-03-12 Otto Oeckl Hydraulische Hochdruckpresse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2335038A (en) * 1940-11-01 1943-11-23 Projectile & Engineering Compa Wire reinforcement
US2600630A (en) * 1946-01-22 1952-06-17 Fergusson Hugh Boscawen Construction of thick-walled high-pressure vessels
US3120205A (en) * 1956-02-07 1964-02-04 Gen Tire & Rubber Co Forming pad for hydraulic press
US2984379A (en) * 1956-07-27 1961-05-16 Csepel Vas Es Femmuvek Transport of industrial gases on rolling stock

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805584A (en) * 1972-01-03 1974-04-23 Asea Ab Press with a pre-stressed press stand
US4163378A (en) * 1977-06-27 1979-08-07 Asea Aktiebolag Hydraulic press
EP1008438B2 (en) † 1998-12-09 2009-11-25 System S.p.A. A structure for presses, in particular for forming ceramic products

Also Published As

Publication number Publication date
GB1212104A (en) 1970-11-11
DE1752093C3 (enExample) 1975-03-20
FR1569057A (enExample) 1969-05-30
JPS504908B1 (enExample) 1975-02-25
DE1752093B2 (de) 1974-08-08
SE369869B (enExample) 1974-09-23
DE1752093A1 (de) 1971-09-30

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