US3717024A - Link-shaped structure for a press frame - Google Patents

Link-shaped structure for a press frame Download PDF

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Publication number
US3717024A
US3717024A US00040801A US3717024DA US3717024A US 3717024 A US3717024 A US 3717024A US 00040801 A US00040801 A US 00040801A US 3717024D A US3717024D A US 3717024DA US 3717024 A US3717024 A US 3717024A
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United States
Prior art keywords
link
frame
press
matrix
press frame
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Expired - Lifetime
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US00040801A
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English (en)
Inventor
E Davison
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Fluid Power Ltd
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Fluid Power Ltd
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Publication date
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    • 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
    • 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

Definitions

  • a press frame usually is of rectangular form, com prising a pair of crossheads which are spaced apart and supported by a pair of upright sidewalls.
  • the main purpose of the frame is to react against the compressive force applied to an object placed between the press platens.
  • Such a rectangular frame is structurally inefficient, because the side walls must provide a bending moment resistance as well as a resistance to the main tensile loads absorbed by the frame sidewalls.
  • the bending moments result from the geometry of the frame structure, and in order to provide the necessary bending moment resistance it is usually necessary to provide crossheads of massive construction.
  • the problem of bending moments in a press frame can be substantially overcome by making the frame in the form of a chain link, that is to say, in the form of a closed loop having substantially semicircular ends and a pair of parallel straight sidewalls.
  • This construction gives rise to a stress distribution throughout the link which is mainly tensile.
  • a press frame in the form of a closed loop having substantially semi-circular ends and a pair of parallel straight side portions, the member being of a filamentary and/or fibrous reinforced plastic or resinous material, the filaments or fibers of which are oriented in the direction of the loop and pre-tensioned so as to hold the material of the loop under compressive stress.
  • Such a link may be fabricated by providing a former of channel section and the desired shape, and winding the reinforced plastic or resinous material around the former to provide a solid matrix.
  • a nozzle spray moulding technique which suitably orientates the reinforcement material.
  • the filament winding process is preferred for the fabrication of press frames, because it permits a controlled winding tension of the reinforcement material, whereby to achieve a reasonably uniform operating stress distribution throughout the cross section of the frame. This condition is obtained by varying the winding tension in a suitable manner across the frame cross section.
  • Various reinforcement materials for the plastic or resinous matrix include glass and carbon filaments, fine high tensile metal wires, graphite fibers, whisker materials, asbestos and mica fillers.
  • the former which is used in the moulding or winding of the matrix, is of no structural significance in the link and can, if the matrix is bonded into a self-supporting rigid mass, be removed.
  • FIG. 1 is a diagrammatic view of a conventional press
  • FIG. 2 is a diagrammatical view, corresponding to FIG. 1, of a press according to the present invention
  • FIG. 3 illustrates a press according to the present invention
  • FIG. 4 is a section on line 4-4 in FIG. 3;
  • FIG. 5 illustrates a modified form of press frame according to the invention.
  • FIG. 6 is a section on line 66 of FIG. 5.
  • FIG. 1 The press illustrated in FIG. 1 comprises a lower crosshead 1, providing a ram chamber 2, an upper crosshead 3 providing a fixed platen, and a pair of upright sidewalls 4.
  • a movable platen 5 is actuated by a ram 6. It is easily seen that when a compressive force F is applied by the platens, the sidewalls are subjected to a direct tensile stress, indicated by f and also a bending moment reaction B
  • FIG. 2 illustrates a form of press according to the present invention, in which the frame is constructed as a closed loop having substantially semicircular end portions 7, 8, and a pair of parallel, upright side portions 9, 10.
  • a pair of yokes 11 and 12 each of substantially semicircular cross section are arranged in parallel and spaced relation with their flat surfaces opposed to each other, the semicircular end portions 7 and 8 of the frame engaging the curved surfaces of the yokes.
  • the upper yoke 11 provides a fixed platen
  • the lower yoke 12 provides a ram chamber 13.
  • FIGS. 3 and 4 A practical embodiment of the press illustrated in FIG. 2 is shown in FIGS. 3 and 4.
  • the press has a link-shaped frame in the form of a closed loop consisting of two substantially semi-circular end portions 15, 16 and two parallel upright side portions 17, 18.
  • the frame consists of a filamentary and/or fibrous reinforced resinous matrix 21 wound upon a channel-sectioned metal former 22.
  • the former 22 also provides attachment points for ancillary equipment.
  • Alternative platen metal guide strips may also be attached to the former.
  • Two semicircular fixed yokes 24, 25 are located in side the ends of the linkshaped frame, the purpose of the yokes being to distribute the applied load as evenly as possible into the frame structure.
  • a movable platen 26, which is actuated by a ram 27, is located and guided by platen guides 23. This ram and its ram chamber may also be fabricated as a filament wound or reinforced matrix component.
  • a reinforced concrete matrix as a surrounding and sup porting structure for the composite ram and ram chamber.
  • the fixed yokes 24, 25 may be of a composite material possessing the desired compressive strength.
  • the matrix is initially wound onto the former as a web, the reinforcing filaments or fibers extending generally in the direction of length of the web, so that in the final matrix the reinforcing filaments or fibers are oriented in the direction of the closed loop and are pre-tensioned so as to hold the matrix under compressive stress.
  • FIGS. and 6 A further link structure for a press frame in accordance with the invention is illustrated in FIGS. and 6.
  • This link structure is substantially of the same construction as the link structure shown in FIGS. 4 and 5, but it consists of a number of such frame elements stacked in the manner illustrated in FIG. 6.
  • the elements of the construction shown in FIGS. 5 and 6 are denoted by the same reference numerals as the corresponding elements shown in FIGS. 3 and 4.
  • the present invention also envisages a link-shaped press frame as described above, but in which the metal former is removed and the elements of the matrix are bonded together by chemical means or by adhesives or cements.
  • lubrication within the resinous or plastic matrix, or in a superficial layer adhering to the surface of the matrix.
  • Such lubrication may consist, for example, of molybdenum disulphide or graphite, dispersed in the matrix.
  • adequate lubrication may result from the use of carbon or graphite fibrous filaments and particles embedded in the matrix for reinforcement purposes.
  • lubrication is to provide a proper stress distribution and/or loading alignment within the press, this being achieved by allowin the matrix to slide over the surface of the metal former, and allowing the metal former to slide over the surface of the fixed yokes, or, where the metal former is not incorporated in the press, by allowing the matrix to slide over the surface of the yokes.
  • a press construction according to the present invention has the property of being self-aligning by reason of the interconnected end yokes of semicircular cross section which are located within the semicircular end portions of the link-shaped frame element.
  • a press frame comprising a pair of yokes each of substantially semicircular shape arranged in parallel and spaced relation with their fiat surfaces opposed to each other, spacing means arranged between and engaging the flat surfaces of the yokes, a unitary link-shaped former in the form of a closed loop having substantially semicircular ends with a pair of parallel straight side portions extending between said ends and an outwardly facing open channel extending about its periphery, said former slidably embracing saidyokes and spacing means with its circular ends engaging the curved surfaces of the yokes; and
  • a solid matrix of plastics material filling said channel and reinforced by filaments which are embedded in the material and oriented in the direction of the loop, the filaments being pretensioned so as to hold the press frame under compressive stress.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US00040801A 1969-05-30 1970-05-27 Link-shaped structure for a press frame Expired - Lifetime US3717024A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2744669 1969-05-30

Publications (1)

Publication Number Publication Date
US3717024A true US3717024A (en) 1973-02-20

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Family Applications (1)

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US00040801A Expired - Lifetime US3717024A (en) 1969-05-30 1970-05-27 Link-shaped structure for a press frame

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US (1) US3717024A (xx)
GB (1) GB1305712A (xx)

Cited By (11)

* 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
US3931728A (en) * 1973-02-27 1976-01-13 Ab Carbox Portal press
US3992837A (en) * 1974-07-29 1976-11-23 Allmanna Svenska Elektriska Aktiebolaget Press stand
US4250735A (en) * 1978-05-30 1981-02-17 Hawkhead Bray & Son Limited Press action machines
US4309893A (en) * 1979-08-27 1982-01-12 Rexnord Inc. Plug-shaped press crown for a press assembly
US4343236A (en) * 1980-03-01 1982-08-10 G. Siempelkamp Gmbh & Co. Prestressed press frame
DE3531114A1 (de) 1984-08-31 1986-03-13 Bobst S.A., Lausanne Verfahren und einrichtung zur druckbeaufschlagung einer presse zum zurichten von werkzeugen
US5027638A (en) * 1990-06-22 1991-07-02 Friestad Roland W Force-resisting structure
US5085069A (en) * 1990-11-26 1992-02-04 Steel Technologies, Inc. Mulit-part rolling mill housing
ITRE20090052A1 (it) * 2009-05-27 2010-11-28 Sacmi Pressa e metodo di montaggio per una pressa.
DE102016102275A1 (de) * 2016-02-10 2017-08-10 Uniflex-Hydraulik Gmbh Radialpresse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT506536B1 (de) * 2009-06-22 2011-09-15 Semlitsch Karl Heinz Vorrichtung zum formen oder bearbeiten von werkstücken

Cited By (17)

* 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
US3931728A (en) * 1973-02-27 1976-01-13 Ab Carbox Portal press
US3992837A (en) * 1974-07-29 1976-11-23 Allmanna Svenska Elektriska Aktiebolaget Press stand
US4250735A (en) * 1978-05-30 1981-02-17 Hawkhead Bray & Son Limited Press action machines
US4309893A (en) * 1979-08-27 1982-01-12 Rexnord Inc. Plug-shaped press crown for a press assembly
US4343236A (en) * 1980-03-01 1982-08-10 G. Siempelkamp Gmbh & Co. Prestressed press frame
DE3531114A1 (de) 1984-08-31 1986-03-13 Bobst S.A., Lausanne Verfahren und einrichtung zur druckbeaufschlagung einer presse zum zurichten von werkzeugen
US5027638A (en) * 1990-06-22 1991-07-02 Friestad Roland W Force-resisting structure
US5085069A (en) * 1990-11-26 1992-02-04 Steel Technologies, Inc. Mulit-part rolling mill housing
ITRE20090052A1 (it) * 2009-05-27 2010-11-28 Sacmi Pressa e metodo di montaggio per una pressa.
EP2255960A1 (en) * 2009-05-27 2010-12-01 SACMI Cooperativa Meccanici Imola Società Cooperativa Press with a pre-stressed frame and method for mounting said press
DE102016102275A1 (de) * 2016-02-10 2017-08-10 Uniflex-Hydraulik Gmbh Radialpresse
WO2017137245A1 (de) * 2016-02-10 2017-08-17 Uniflex-Hydraulik Gmbh Radialpresse
US20180361459A1 (en) * 2016-02-10 2018-12-20 Uniflex-Hydraulik Gmbh Radial press
US11084082B2 (en) * 2016-02-10 2021-08-10 Uniflex-Hydraulik Gmbh Radial press
EP3414086B1 (de) * 2016-02-10 2022-08-17 Uniflex-Hydraulik GmbH Radialpresse
EP4098432A3 (de) * 2016-02-10 2023-04-12 Uniflex-Hydraulik GmbH Radialpresse

Also Published As

Publication number Publication date
GB1305712A (xx) 1973-02-07

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