EP1345713B1 - Hydraulische presse mit druckzelle mit einem aus vorgespannten lamellen bestehenden tablett - Google Patents

Hydraulische presse mit druckzelle mit einem aus vorgespannten lamellen bestehenden tablett Download PDF

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Publication number
EP1345713B1
EP1345713B1 EP01998415A EP01998415A EP1345713B1 EP 1345713 B1 EP1345713 B1 EP 1345713B1 EP 01998415 A EP01998415 A EP 01998415A EP 01998415 A EP01998415 A EP 01998415A EP 1345713 B1 EP1345713 B1 EP 1345713B1
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EP
European Patent Office
Prior art keywords
tray
press
lamellar means
pressure cell
lamellar
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
EP01998415A
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English (en)
French (fr)
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EP1345713A1 (de
Inventor
Keijo Hellgren
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Avure Technologies AB
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Avure Technologies AB
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Publication date
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Publication of EP1345713A1 publication Critical patent/EP1345713A1/de
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    • 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
    • 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
    • B30B15/048—Laminated frame structures

Definitions

  • the present invention relates to a press of pressure cell type, a tray for use in a press of pressure cell type and a method for manufacturing such a tray, (see for example SE-B-452 436).
  • a press of pressure cell type generally comprises a force-absorbing press body which defines a press chamber.
  • a press plate and a diaphragm of rubber or another resilient material are arranged, which together form a pressure cell.
  • the pressure cell communicates with a source of pressure and expands when a pressure medium is supplied.
  • a structural support or a tray is arranged, which comprises a bottom plate having a tray frame. The tray supports a working tool or a forming tool, a workpiece, a mat of rubber or another resilient material, covering the forming tool and the workpiece.
  • Presses of pressure cell type are used, among other things, when forming sheet-shaped blanks, for example sheets of steel or aluminium, for short series products within the aircraft industry and the motor industry.
  • the sheet is placed in the press in such a manner that one of its sides faces a forming tool.
  • the resilient diaphragm is arranged on the other side of the sheet.
  • a closed space between the diaphragm and the press plate located above the diaphragm constitutes the pressure cell and this space is filled during the forming process with a pressure medium.
  • Another field in which presses of pressure cell type are used is wood compaction when a workpiece of wood is exposed to high pressure, either in a forming tool or on its own.
  • Reasons for compacting wood are, for example, that it is desirable to increase the hardness of the wood, decrease the moisture content or to obtain a phase in pressure impregnation.
  • SE 452 436 discloses a press of pressure cell type which was developed with the purpose of solving the above-mentioned problem.
  • Said patent specification discloses a press plant having a forged, cylindrical press body which defines a press chamber.
  • a tray which supports a forming tool and a workpiece is inserted into the press chamber.
  • a large annular support which is arranged round the press body is adapted to absorb load being induced on the tray during a pressing operation. Each time the tray is to be taken out or inserted, the annular support has to be elevated in order to make the press chamber accessible. This is a complicated and time-consuming method.
  • the object of the present invention is to provide a press of pressure cell type which reduces the above-mentioned problems.
  • Another object of the invention is to provide a tray which, in comparison with prior-art technique, gives advantages when handling a press of pressure cell type.
  • a "tray” means a device with the purpose of including a forming tool and/or a workpiece. In the traditional sense, it may thus comprise walls and a bottom plate. However, it should also comprise an essentially annular configuration which is adapted to be arranged in a detachable manner on a separate bottom plate; for example, the tray can rest on a bottom plate belonging to a press body, or a bottom plate which can be pushed in and pulled out of the press. In the detachable variant, the tray is thus tubular and has a through aperture which is defined by an annular wall configuration.
  • a press of pressure cell type comprises a force-absorbing press body which encloses a press chamber, in which press chamber a tray is arranged.
  • the tray defines a space for arranging a forming tool and/or a workpiece.
  • prestressing means are arranged on the external surface of the tray and induce a compressing prestress which acts in planes parallel to the plane of the tray, i.e. essentially horizontal planes.
  • a tray for use in a press of pressure cell type, prestressing means that induce a compressing prestress, which acts in planes parallel to the plane of the tray, being arranged on the external surface of the tray.
  • the present invention is thus based on the understanding that considerable improvements regarding handling and time expenditure can be provided by moving the force-absorbing function closer to the actual tray, without needing to use forged, thick trays. Consequently, the invention does not apply the known principle of improving the technique by having external means, such as an annular support, which are arranged outside the press body in order to absorb forces which are induced in the tray during the pressing. On the contrary, such external means are excluded in the present invention by prestressing means instead being integrated with the tray.
  • the tray is thus adapted to independently absorb or withstand axial load unlike the prior-art press having the annular support.
  • the prestressing means according to the invention allow a considerable decrease of the thickness of the tray as regards short sides and radius transitions compared with a traditionally forged tray. This means that the tray according to the invention allows a greater working depth in relation to previously known forged trays and also that aspects such as manufacturing and transport of the tray are improved.
  • the prestressing means are adapted to induce a compressing prestress on the tray in planes which are parallel to the plane of the tray, i.e. planes which are perpendicular to the main direction of the pressing.
  • the prestressing means are arranged on the external circumferential surface of the tray in the form of wound prestressing elements.
  • the tray comprises a number of plate-shaped lamellar means which abut against one another.
  • Each lamellar means is annular and has a central through hole.
  • the lamellar means which are plate-shaped are thus arranged on one another in different planes of the tray or planes of the plate and are arranged concentrically with the central holes.
  • a workpiece such as a metal sheet or a piece of wood, is intended to be machined in the space that is mutually formed by the holes of the concentric lamellar means.
  • the tray is prestressed in such a manner that each lamellar means is individually prestressed.
  • This is preferably provided by a prestressing element being arranged on each lamellar means. It has turned out to be particularly advantageous to use and wind by means of a prestressing element that is band-shaped and has essentially the same width as the thickness of a lamellar means.
  • the invention is also based on the understanding that, by dividing the tray arrangement into several annular parts, the manufacturing and transport of a tray are facilitated, and the handling is made easier when the press of pressure cell type is in operation.
  • These parts or lamellar means can be assembled to a tray at the location where the press is to be used and can also be dismounted individually for further transport or storage.
  • the dismountability also has advantages when a press plant is in operation, which will be made evident by the following description.
  • the tray can have a tool-holding function.
  • a forming tool can be arranged having a workpiece arranged thereon. In the case of wood compaction, the forming tool can be excluded.
  • a preferred embodiment of the invention comprises the features that the tray is divisible because of the fact that it comprises lamellar means of the above-described type which are dismountably arranged on one another.
  • the lowest lamellar means is preferably detachably arranged on a bottom plate in the press chamber.
  • a diaphragm support is preferably arranged above the uppermost lamellar means, and a press plate is, in its turn, arranged above the diaphragm support.
  • the holes in the lamellar means thus together form a space which is defined by the inner wall of the internal lamellar means, the bottom plate and a diaphragm which is placed in the diaphragm support.
  • one or more lamellar means can be arranged between the lowest lamellar means and the diaphragm support.
  • the tray comprises only one lamellar means.
  • the divisible tray is arranged in a press chamber in such a manner that the diaphragm support placed above the tray can be lifted in the direction towards the press plate.
  • Actuating means such as hydraulic pistons, are suitably adapted to lift the diaphragm support (and possibly also one or more lamellar means).
  • the inner diameter of the diaphragm support essentially corresponds to the circumference or diameter of the press plate and, due to this fact, the diaphragm support can be made to enclose the press plate when it is lifted upwards. It is convenient that the diaphragm support is so high that it encloses the press plate also in a non-lifted state so that satisfactory sealing is obtained during pressing.
  • the diaphragm support is preferably formed as a lamellar means, which as regards its appearance is essentially similar to the lamellar means comprised in the tray, and is adapted to hold a diaphragm which forms a pressure cell together with the press plate. Since the diaphragm is generally not removed or replaced as often as the workpiece is, it is an advantage if it is not necessary to remove the diaphragm support from the press when a workpiece or forming tool is to be removed from the press.
  • a considerable advantage of the lifting function in the press chamber as described above is that the replacement of a workpiece or a forming tool is facilitated.
  • the underlying lamellar means being easy to remove in the direction of the main axis of the press chamber, since there is no friction against the diaphragm support.
  • the direction of the main axis of the press chamber is in a horizontal plane.
  • the internal lamellar means are advantageously loosely arranged on the bottom plate and on one another; however, a type of control elements are arranged in order to ensure correct placements. Due to the fact that the internal structure of the press comprises lamellar means which are loosely arranged on one another, it is possible to easily take these out separately or several at the same time.
  • the lamellar means can have several purposes; on the one hand, they may constitute a direct or indirect support for a working tool or forming tool on which for example, a metal sheet is to be shaped and, on the other, they can support or fasten various parts which are active in the press.
  • a diaphragm which together with the press plate forms a pressure cell can be clamped between two lamellar means or the uppermost lamellar means and the press plate.
  • the diaphragm can rest loosely against a shelf which protrudes from the uppermost lamellar means which corresponds to the above-described diaphragm support.
  • a mat which is used to protect the diaphragm and is placed below the same can be fastened between two lamellar means.
  • the metal sheet can be fastened with the aid of suitable means.
  • the press structure can therefore be made relatively open by the short sides of the press chamber wall, i.e. the external sides of the lamellar means being accessible with the aim of inserting and removing the internal lamellar means.
  • part of the internal lamellar means will preferably protrude at the ends of the press beyond the actual press body.
  • each annular lamellar means which advantageously are used to form a tray are essentially oval as regards their shape.
  • each annular lamellar means has a wall configuration which defines a central hole and can be compared to a closed running track in a stadium.
  • the wall configuration has two parallel sides which at the respective ends are connected to one another by a convex semicircular portion in such a manner that a closed track is formed.
  • the holes have an essentially rectangular or square cross-section in the horizontal plane.
  • this is provided by means of filling blocks of resilient material, such as rubber, which are arranged on the inside of the tray inside the semi-circular portions of the lamellar means which are arranged on one another.
  • the purpose of the filling blocks is, among other things, to serve as support for a forming tool. If the forming tool is large enough, the filling blocks can be excluded. It is also suitable to use filling blocks in wood compaction since a workpiece has the shape of a right-angled block. In addition, the purpose of the filling blocks is to absorb and distribute forces and stress which are generated during a pressing operation.
  • the tray according to the invention is exposed to an internal overpressure, which results in the tray then tending to expand and high tension being generated in the inner circumference of the tray. It may therefore be desirable to control the deformations in the tray.
  • One way is to arrange force-transmitting means or force generators separate from the tray which generate a force in the horizontal plane.
  • such force-transmitting means are adapted to "actively" apply to the tray one or more radially prestressing and/or radially predeforming forces.
  • these forces can be applied to one or more lamellar means if the tray comprises such lamellar means.
  • the force-transmitting means comprise hydraulic pistons or other suitable devices having a corresponding function.
  • the purpose of said means may also be to eliminate any initial clearance between lamellar means and side walls which are located next to them in the press chamber.
  • the lamellar means in the tray according to the invention can be given the desired shape by milling or cutting. Different types of cutting are possible, a few examples being water cutting, plasma cutting and flame cutting. Those skilled in the art will realise that this is a considerably simpler process than forming the traditional compact tray by forging. There will also be a great simplification as regards transport of the lamellar means which are each relatively light, in comparison with transport of trays according to prior-art technique.
  • the tray or the lamellar means are made of hot-rolled steel sheet which subsequently is easily given the desired shape. In the present invention, it has been found that it is suitable to use a sheet thickness of 80-200 mm, preferably 100-150 mm, especially 100-120 mm.
  • lamellar means are separate units which, by degrees, together are to form a tray, manufacture of them can be accelerated considerably.
  • various lamellar means blanks can be machined in the respective stations at the same time.
  • a first lamellar means blank can be machined in a certain station and when this lamellar means blank has been moved on to a subsequent station for further machining, a second lamellar means blank can be machined at the same time in said certain station.
  • This parallel performing of different manufacturing steps thus turns out to be very beneficial. It is also distinctly easier to move a relatively thin lamellar means in comparison with a large traditional tray.
  • some stations can machine several lamellar means blanks simultaneously.
  • the lamellar means are easily transported to the location where the press of pressure cell type is intended to be used and assembled in situ. It has been found that the tray structure according to the invention having integrated prestressing means functions excellently at typical working pressures (such as 1200 bar) for presses of pressure cell type. Instead of making a large and heavy tray, it is possible to divide the structure into several plates which each weigh less and thus are easier to handle.
  • the tray according to the invention advantageously is used in a press chamber which is enclosed by a traditional, forged press body, it has been found to be practical to make also the press body of force-absorbing lamellar means, and because of this fact the main part of the press can be manufactured in the same way and is easy to transport in parts which are subsequently assembled at the location where the press is to be used.
  • each lamellar means from two or more parts, which then by said winding of a band are connected to a coherent unit.
  • Fig. 1 is a side view (of the long side), partly in cross-section, of a press of pressure cell type 10 according to one embodiment of the present invention.
  • a central portion of the press of pressure cell type 10 is cut out of the Figure, an ordinary side view of the press being shown to the left of the central portion and a side view in cross-section of the press being shown to the right of the central portion.
  • the press of pressure cell type 10 is essentially made up of plate-shaped lamellar means.
  • a force-absorbing press body is formed of external lamellar means 12 which are vertically arranged at a distance from one another. Each external lamellar means 12 has a central hole, the press body thus enclosing a press chamber in which the actual pressing operation takes place.
  • An upper press plate 14 and a bottom plate 16 run through the central holes of the external lamellar means 12. Between these plates, a diaphragm support 18 and an internal horizontal lamellar means 20, which abut against one another, are arranged.
  • the diaphragm support 18 is plate-shaped and annular and thus has a shape that essentially corresponds to the internal lamellar means 20.
  • the internal lamellar means 20 rests detachably on the bottom plate 16, whereas the diaphragm support 18 is arranged so that it partly encloses the press plate 14 (shown in the right part of the figure) with the purpose of ensuring sufficient sealing.
  • the circumference of both the internal and the external lamellar means 12, 20 (also the diaphragm support 18) is defined by a relatively narrow, circumferential, external edge surface 22.
  • a plurality of turns of a band 24 of spring steel are wound round the external edge surface 22 of the lamellar means 12, 20 and the diaphragm support 18, the band 24 having a width which essentially corresponds to the thickness of a lamellar means 12, 20 and a diaphragm support 18, respectively.
  • the height of the band layer 24 of the lamellar means 12, 20 and of the diaphragm support 18 is about 100 mm and the layer can consist of one single long band or a plurality of joined pieces of band.
  • a lamellar means 12, 20, When a lamellar means 12, 20, is being manufactured, the band 24 is wound round the same under resistance so that a compressing prestress is permanently induced in the lamellar means 12, 20.
  • Fig. 1 shows that the tray according to the invention, i.e. the internal lamellar means 20, is without external support at the short sides of the press of pressure cell type 10 since the turns of the band 24 replace that function satisfactorily. For the same reason, the diaphragm support 18 does not have an external support.
  • Fig. 1 The right part in Fig. 1 is as mentioned a side view in cross-section of the press of pressure cell type 10.
  • the cross-section is made at the middle of the press, i.e. along the main axis of the press chamber.
  • the right part of Fig. 1 clearly shows that both the lamellar means 12, 20 and the diaphragm support 18 are wound with a band 24 on the respective external edge surface 22.
  • the turns of the band 24 of the internal tray-forming lamellar means 20 and the diaphragm support 18 are, according to the invention, intended to essentially permanently limit the expansion of these, i.e. they should be able to resist the forces that are formed in the press chamber.
  • the internal lamellar means 20 is annular, which thus means that it defines an internal, open space 26, being comprised in the press chamber.
  • a diaphragm 28 is arranged in the open space of the diaphragm support 18.
  • the diaphragm has a seal 30 against the press plate 14 and forms a pressure cell with the same. When in operation, the pressure medium is supplied to the pressure cell in such a manner that the diaphragm 28 expands.
  • the open space 26 of the internal lamellar means 20, which is placed below the diaphragm 18, is adapted to contain a forming tool or working tool.
  • a metal sheet which is to be pressed against the working tool is arranged in a suitable manner above the working tool, the diaphragm 28 in connection with pressurisation being expanded and shaped on the working tool, which means that the metal sheet located therebetween also is shaped on the working tool.
  • the Figure shows a mat 32 which is arranged just below the diaphragm 28.
  • the mat 32 takes part in the shaping of the metal sheet and protects at the same time the diaphragm 28 against wear and tear.
  • a piece of wood can arranged and be pressed either directly against the bottom plate 16 or against a working tool which is arranged on the bottom plate.
  • the external lamellar means 12 are, apart from the central hole, each provided with four circular apertures, two above and two below the hole.
  • the apertures are adapted to receive coupling means.
  • coupling means 36 two of which are shown
  • the press-body-forming lamellar means 12 are kept at a distance from one another by the fact that round each coupling means 36, between the lamellar means 12, there are distance means 38 having a thickness that is as large as the desired distance between the lamellar means.
  • the distance means 38 are made of a relatively rigid material and their inner diameter is larger than that of the coupling means 36 at the same time as their external measures are essentially larger than the apertures arranged in the lamellar means 12.
  • stop devices 40 At the two external ends of the coupling means 36, outside the respective external lamellar means 12 which are included in the press body, there are stop devices 40 of which at least one has a fixing and clamping mechanism which is complementary to the coupling means 36.
  • the attaching and stressing mechanism can comprise a washer and a nut, the washer having external measures which are essentially larger than the coupling apertures of the external lamellar means.
  • the four coupling means 36 are thus tightened to a predetermined prestress condition. This eliminates play and motion in the construction and at the same time contributes to the structural stability of the construction as regards flexural rigidity, torsional rigidity and resistance to extension in all dimensions.
  • Fig. 2A shows the press of pressure cell type in cross-section along the line A-A in Fig. 1.
  • the Figure shows that an external lamellar means 12 is plate-shaped.
  • the central through holes of the external lamellar means 12 are defined by an internal edge surface.
  • the hole is essentially quadrangular, but without actual corners.
  • the "corner regions” are instead rounded and bend inwards into the wall so that a larger hole area is obtained. The radii of these inward bends are made relatively large with the aim of minimising the stress concentration that arises in the corner regions.
  • the external lamellar means 12 is essentially quadrangular and has rounded corners.
  • the shape of the lamellar means 12 is adapted to the expected thrust which arises in connection with the pressing.
  • the material quantity or the distance between the internal and the external edge surface is larger vertically than horizontally since the main direction of pressing is vertical.
  • a plurality of turns of a band 24 of spring steel are wound round the external edge surface of the external lamellar means 12, the internal lamellar means 20 and the diaphragm support 18 which are shown in Fig. 2A, the band 24 having a width which essentially corresponds to the thickness of the respective lamellar means 12, 20 (or diaphragm support 18).
  • Each band can be one single long band or a plurality joined pieces of band.
  • Fig. 2A also shows side walls 50 which are arranged on one side each of the internal lamellar means 20 and the diaphragm support 18 and extend in the direction of the main axis of the press chamber.
  • the side walls 50 have a height which essentially corresponds to the distance between the upper press plate 14 and the bottom plate 16.
  • the internal lamellar means 20 and the diaphragm support 18 are during pressing exposed to an internal overpressure, and because of this fact the lamellar means and the diaphragm support aim at expanding, whereby high tensile stress in their inner circumference is generated. For this reason, a hydraulic compensator or a generator 52 of horizontal force is arranged adjacent to the left side wall 50 in the figure.
  • This generator affects the internal lamellar means 20 and the diaphragm support 18 horizontally and predeforms and prestresses the deformation zones thereof.
  • this generator 52 is separate from the internal tray-forming lamellar means 20 and the diaphragm support 18, and is adapted to apply these radially prestressing or predeforming forces.
  • the generator 52 comprises hydraulic pistons.
  • Fig. 2B is a partial top plan view of the internal lamellar means 20 in Fig. 2A.
  • this lamellar means 20 has the shape of a "running track", i.e. its wall is defined by two parallel straight portions which at the ends are connected to one another by convex semicircles.
  • a semi-circular filling block or end block 54 of resilient material, such as rubber, is fitted so that the remaining free space is quadrangular.
  • the purpose of the end blocks 54 is to serve as support for the forming tool or working tool.
  • Straight resilient supports 56 which are parallel to the direction of the main axis of the press chamber can also be arranged adjacent to the straight wall portions.
  • These supports 56 and end blocks 54 (which correspond to the filling element 34 in Fig. 1) also have a protecting function in the sense of protecting and prolonging the life of the internal lamellar means 20. Since the internal lamellar means 20 and the diaphragm support 18 are prestressed by the turns of the band 24, no external limiting means are required and therefore, for example, the semi-circular portions can protrude from the short sides of the press body as shown in Fig. 1. Since the internal tray-forming lamellar means 20 protrudes, it is relatively easily accessible, which is time-saving when metal sheets are removed, tools are replaced, diaphragms are replaced etc.
  • Figs 3A-3E show end views of different variants of presses of pressure cell type according to the invention.
  • the Figures thus show that the size of the external press body as well as the internal press chamber with a tray can vary.
  • the tray can be made of different numbers of internal lamellar means, and the thickness of the lamellar means can vary.
  • Figs 3A-3C illustrate some variants where an internal lamellar means 60 is arranged between a diaphragm support 62 and a bottom plate 64.
  • a press plate 66 is arranged above the diaphragm support 62.
  • an external press-body-forming lamellar means 68 can be made in different sizes and have different shapes.
  • the size of the internal lamellar means 60 can also vary.
  • the dimensions of the load space are 100 X 200 X 2500 mm 3 and the tray is suitable for a working pressure of 1200 bar.
  • Fig. 3B and Fig. 3C the dimensions of the load space are 125 X 500 X 1500 mm 3 and 200 X 710 X 2000 mm 3 , respectively.
  • Fig. 3D shows another variant having a tray which comprises two lamellar means 60a, 60b that are arranged between the diaphragm support 62 and the bottom plate 64.
  • the dimensions of the load space are 200 X 1100 2000 mm 3 .
  • Fig. 3E shows a variant having a tray which comprises four lamellar means 60a, 60b, 60c, 60d that are arranged between the diaphragm support 62 and the bottom plate 64.
  • the dimensions of the load space are 400 X 1600 X 4000 mm 3 .
  • Figs 4A-4C show the function of a detached force generator 80.
  • An essentially oval tray 82 (or a lamellar means included in the tray) according to the invention is exposed to an internal overpressure during a pressing operation. High tensile stress is generated in the inner circumference of the tray. It can therefore, among other things, be desirable to control possible deformations.
  • the generator 80 applying the force F in the horizontal direction eliminates initial clearance I between the tray 82 and the side wall 84, which is schematically illustrated in Fig. 4A that is a cross-sectional view as Fig. 2A.
  • Fig. 4B is a partial top plan view of a lamellar means or tray 82 as Fig. 2B.
  • stress concentration may.arise during pressing operations due to peeling.
  • compressive stress is provided in the tip 86 so that the peeling is reduced or eliminated.
  • Fig. 4C is a top plan view of a lamellar means or a tray 82 and side walls 84.
  • stress concentration can arise in the transition zones 88 between the straight long sides of the tray 82 and two semi-circular wall portions.
  • compressive stress is thus generated in the transition or deformation zones 88.
  • the transition zones 88 are excessively bent to reduce the tensile stress.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Press Drives And Press Lines (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)

Claims (27)

  1. Presse (10) von Druckzellenart, die einen kraftabsorbierenden Körper (12, 68) aufweist, der eine Presskammer umschließt, in welcher Presskammer ein Tablett (20, 60, 60a, 60b, 60c, 60d, 82) angeordnet ist, das einen Raum (26) zum Anordnen eines Formwerkzeugs und/oder eines Werkstücks definiert,
    dadurch gekennzeichnet,
    dass das Tablett eine ringförmige Auslegung mit einer Innenfläche, die den Raum definiert, und eine Außenfläche (22) aufweist, wobei vorspannende Mittel (24), die eine verdichtende Vorspannung veranlassen, die in Ebenen parallel zu der Ebene des Tabletts wirkt, auf der Außenseite angeordnet sind.
  2. Presse von Druckzellenart nach Anspruch 1, wobei das vorspannende Mittel wenigstens ein vorspannendes Element aufweist, das rund um die Außenfläche gewunden ist.
  3. Presse von Druckzellenart nach Anspruch 2, wobei die ringförmige Auslegung wenigstens ein plattenförmiges, ringförmiges Lamellenmittel (20, 60, 60a, 60b, 60c, 60d, 82) aufweist, das ein in der Mitte gelegenes Loch besitzt, wobei ein zu bearbeitendes Werkstück in den Raum, der durch das mittige Loch ausgebildet wird, eingepasst wird.
  4. Presse von Druckzellenart nach irgendeinem der Ansprüche 1 - 3, wobei das Tablett eine Anzahl von konzentrischen, plattenförmigen, ringförmigen Lamellenmitteln aufweist, die aneinander angrenzen, wobei alle eine mittige Durchbrechung aufweisen und in Ebenen angeordnet sind, die parallel zu der Ebene des Tabletts verlaufen, wobei ein zu bearbeitendes Werkstück in den Raum eingepasst wird, der gemeinsam von den Löchern der konzentrischen Lamellenmittel ausgebildet wird.
  5. Presse von Druckzellenart nach irgendeinem der Ansprüche 3 - 4 in Kombination mit Anspruch 2, wobei das vorspannende Element bandförmig ist und im Wesentlichen die gleiche Breite wie die Dicke eines Lamellenmittels aufweist, wobei jedes Lamellenmittel mit einem vorspannenden Element versehen ist.
  6. Presse von Druckzellenart nach Anspruch 4 oder 5 in Kombination mit Anspruch 4, wobei die Lamellenmittel voneinander lösbar sind.
  7. Presse von Druckzellenart nach irgendeinem der Ansprüche 3 - 6, wobei das unterste Lamellenmittel (20, 60, 60b, 60d) lösbar an einer Bodenplatte (16, 64) in der Presskammer angeordnet ist.
  8. Presse von Druckzellenart nach irgendeinem der Ansprüche 3 - 7, wobei eine Membranhalterung (18, 62) zum Halten einer Membran (28) über und beim Pressen des Werkstücks angrenzend an die obersten Lamellenmittel (20, 60, 60a) so angeordnet ist, dass die Membran zusammen mit einer Pressplatte (14, 66), die in dem oberen Abschnitt der Presskammer angeordnet ist, eine Druckzelle ausbildet, wobei die Membran in Verbindung mit der Zufuhr von Druckmedium zu der Druckzelle so ausgelegt ist, dass sie einen formenden Druck auf das darunter angeordnete Werkstück ausübt.
  9. Presse von Druckzellenart nach Anspruch 8, die mit solchen Abmessungen ausgelegt ist, dass wenigstens die Membranhalterung und optional ein oder mehrere Lamellenmittel zu dem Zweck anhebbar sind, die darunter liegenden Lamellenmittel in der Presskammer freizulegen, wobei ein oder mehrere der darunter liegenden Lamellenmittel aus der Presskammer entfernt werden können, während die Membranhalterung und alle restlichen Lamellenmittel in der Presskammer gelassen werden.
  10. Presse von Druckzellenart nach Anspruch 9, wobei die restlichen Lamellenmittel aus der Presskammer herausnehmbar sind, wenn die Presskammer von den darunter liegenden Lamellenmitteln frei ist.
  11. Presse von Druckzellenart nach irgendeinem der Ansprüche 3 - 10, welche mindestens ein kraftübertragendes Mittel (52, 80), wie beispielsweise hydraulische Kolben, umfasst, welches so ausgelegt ist, dass es aktiv an eines oder mehrere der Lamellenmittel und vorzugsweise an die Membranhalterung eine oder mehrere vorspannende und/oder vorverformende Kräfte in der Plattenebene der Lamellenmittel anlegt, so dass einer Zugbelastung und einer Druckbelastung, die im Zusammenhang mit dem Pressen entstehen, entgegengewirkt wird.
  12. Presse von Druckzellenart nach irgendeinem der vorhergehenden Ansprüche, wobei das Tablett aus einer warmgewalzten Stahlplatte gefertigt ist.
  13. Tablett (20, 60, 60a, 60b, 60c, 60d, 82) zur Verwendung in einer Presse (10) von Druckzellenart, welches Tablett einen Raum (26) zu dem Zweck definiert, ein Formwerkzeug und/oder ein Werkstück anzuordnen,
    dadurch gekennzeichnet,
    dass das Tablett eine ringförmige Auslegung mit einer Innenfläche, die den Raum definiert, und eine Außenfläche (22) aufweist, wobei vorspannende Mittel (24), die eine verdichtende Vorspannung veranlassen, die in Ebenen parallel zu der Ebene des Tabletts wirkt, auf der Außenseite angeordnet sind.
  14. Tablett nach Anspruch 13, wobei das vorspannende Mittel wenigstens ein vorspannendes Element aufweist, das rund um die Außenfläche gewunden ist.
  15. Tablett nach Anspruch 14, wobei die ringförmige Auslegung wenigstens ein plattenförmiges, ringförmiges Lamellenmittel (20, 60, 60a, 60b, 60c, 60d, 82) aufweist, das ein in der Mitte gelegenes Loch besitzt, wobei ein zu bearbeitendes Werkstück in den Raum, der durch das mittige Loch ausgebildet wird, eingepasst wird.
  16. Tablett nach irgendeinem der Ansprüche 13 - 15, welches eine Anzahl von konzentrischen, plattenförmigen, ringförmigen Lamellenmitteln aufweist, die aneinander angrenzen, wobei alle eine mittige Durchbrechung aufweisen und in Ebenen angeordnet sind, die parallel zu der Ebene des Tabletts sind, wobei ein zu bearbeitendes Werkstück in den Raum eingepasst wird, der gemeinsam von den Löchern der konzentrischen Lamellenmittel ausgebildet wird.
  17. Tablett nach irgendeinem der Ansprüche 15 - 16 in Kombination mit Anspruch 14, wobei das vorspannende Element bandförmig ist und im Wesentlichen die gleiche Breite wie die Dicke eines Lamellenmittels aufweist, wobei jedes Lamellenmittel mit einem vorspannenden Element versehen ist.
  18. Tablett nach irgendeinem der Ansprüche 13 - 17, vorzugsweise zur Verwendung in einer Presse von Druckzellenart nach irgendeinem der Ansprüche 1 - 12, wobei der Raum einen rechtwinkligen oder quadratischen Querschnitt in Ebenen aufweist, die parallel zu der Ebene des Tabletts sind.
  19. Tablett nach Anspruch 18, wobei der rechtwinklige oder quadratische Querschnitt mittels Füllelementen (34, 54) bereitgestellt wird, die auf der Innenseite des Tabletts angeordnet sind, welche Innenseite eine im Wesentlichen ovale Form aufweist, die vorzugsweise durch zwei parallele gerade Seiten definiert ist, die an den Enden mittels halbkreisförmiger Abschnitte miteinander verbunden sind.
  20. Tablett nach Anspruch 16, wobei zwei Lamellenmittel, die aneinander angrenzen, so ausgebildet sind, dass ein Werkstück, wie beispielsweise ein Metallblech, das sich quer zu dem Raum erstreckt, in der Position gehalten wird, wenn diese zwei Lamellenmittel zusammengeführt worden sind.
  21. Tablett nach irgendeinem der Ansprüche 13 - 20, wobei das Tablett aus einer warmgewalzten Stahlplatte gefertigt ist.
  22. Verfahren zum Herstellen eines Tabletts gemäß Anspruch 13 zur Verwendung in einer Presse von Druckzellenart, umfassend die Schritte zum
    Ausbilden des Tabletts aus einer Stahlplatte und
    Zuführen einer restlichen Druck-Vorbelastung zu dem Tablett, wobei die Vorspannung in Ebenen wirkt, die zu der Ebene des Tabletts parallel sind.
  23. Verfahren nach Anspruch 22, wobei der Schritt zum Ausbilden des Tabletts das Ausbilden von plattenförmigen Lamellenmitteln aus einer Stahlplatte, vorzugsweise einer warmgewalzten Stahlplatte und das Versehen von jedem von ihnen mit einer Durchbrechung und das Anordnen jedes Lamellenmittels umfasst, wobei die Ebene der Platte parallel zu der Ebene der Platte eines konzentrisch angrenzenden Lamellenmittels ausgerichtet ist, wobei ein zu bearbeitendes Werkstück in den Raum eingepasst ist, der gemeinsam von den Löchern der konzentrischen Lamellenmittel ausgebildet wird.
  24. Verfahren nach Anspruch 23, wobei vorspannende Elemente rund um die Außenkantenoberfläche der Lamellenmittel gewunden sind zu dem Zweck, die Vorspannung bereitzustellen.
  25. Verfahren nach Anspruch 24, wobei ein vorspannendes Element verwendet wird, das bandförmig ist und im Wesentlichen die gleiche Breite wie die Dicke eines Lamellenmittels aufweist.
  26. Verfahren nach irgendeinem der Ansprüche 23-25, welches umfasst, den Lamellenmitteln die gewünschte Form durch Fräsen oder Schneiden zu geben, wie beispielsweise Wasserschneiden, Plasmaschneiden, Brennschneiden usw.
  27. Verfahren nach irgendeinem der Ansprüche 23 - 26, welches die Herstellung der Lamellenmittel aus einer Stahlplatte mit einer Dicke von 80 - 200 mm, vorzugsweise 100 - 150 mm, insbesondere 100 - 120 mm umfasst.
EP01998415A 2000-11-28 2001-11-23 Hydraulische presse mit druckzelle mit einem aus vorgespannten lamellen bestehenden tablett Expired - Lifetime EP1345713B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0004369 2000-11-28
SE0004369A SE520582C2 (sv) 2000-11-28 2000-11-28 Ringformat och förspännt tråg och tryckcellspress med tråget
PCT/SE2001/002595 WO2002043889A1 (en) 2000-11-28 2001-11-23 Hydraulic press with pressure cell with a tray whic consists of prestressed lamellas

Publications (2)

Publication Number Publication Date
EP1345713A1 EP1345713A1 (de) 2003-09-24
EP1345713B1 true EP1345713B1 (de) 2006-02-22

Family

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EP01998415A Expired - Lifetime EP1345713B1 (de) 2000-11-28 2001-11-23 Hydraulische presse mit druckzelle mit einem aus vorgespannten lamellen bestehenden tablett

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Country Link
US (1) US20040065138A1 (de)
EP (1) EP1345713B1 (de)
CN (1) CN1261251C (de)
AT (1) ATE318191T1 (de)
AU (1) AU2002224285A1 (de)
DE (1) DE60117415T2 (de)
SE (1) SE520582C2 (de)
WO (1) WO2002043889A1 (de)

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771850A (en) * 1952-03-11 1956-11-27 Douglas Aircraft Co Inc High-pressure hydraulic press
US3033143A (en) * 1955-09-27 1962-05-08 Verson Alisteel Press Company Hydraulic press
US3545241A (en) * 1968-04-22 1970-12-08 Verson Allsteel Press Co Hydraulic press
US3531966A (en) * 1968-04-25 1970-10-06 Verson Allsteel Press Co Hydraulic press
SE368173B (de) * 1972-11-14 1974-06-24 Asea Ab
SE392822B (sv) * 1973-12-06 1977-04-25 Asea Ab Hydraulisk press med en tryckcell med ett elastiskt membran och en av detta paverkad formdyna
SE404141B (sv) * 1975-12-23 1978-09-25 Asea Ab Hydraulisk press av den typ som innehaller en tryckcell med ett seckliknande membran och en av tryckcellen paverkbar pressdyna av elastiskt material for formning av foretredesvis platar
SE404140B (sv) * 1975-12-23 1978-09-25 Asea Ab Hydraulisk press av den typ som innehaller en tryckcell med ett seckliknande membran av elastiskt material och en av tryckcellen paverkbar pressdyna av elastiskt material for formning av foretredesvis platar
FR2491044A1 (fr) * 1980-09-26 1982-04-02 Spie Batignolles Procede pour renforcer un corps creux realise par enroulement d'un profile, profile pour sa mise en oeuvre et canalisations s'y rapportant
SE440995B (sv) * 1984-01-20 1985-09-02 Asea Ab Hydraulisk press med tryckcell
SE446611B (sv) * 1985-02-06 1986-09-29 Asea Ab Press av tryckcelltyp
SE450227B (sv) * 1985-04-18 1987-06-15 Asea Ab Press av tryckcelltyp
SE452436B (sv) * 1986-03-25 1987-11-30 Asea Ab Pressanleggning med en press av tryckcelltyp

Also Published As

Publication number Publication date
WO2002043889A1 (en) 2002-06-06
SE520582C2 (sv) 2003-07-29
AU2002224285A1 (en) 2002-06-11
ATE318191T1 (de) 2006-03-15
SE0004369D0 (sv) 2000-11-28
DE60117415T2 (de) 2006-08-03
CN1474724A (zh) 2004-02-11
US20040065138A1 (en) 2004-04-08
EP1345713A1 (de) 2003-09-24
CN1261251C (zh) 2006-06-28
DE60117415D1 (de) 2006-04-27
SE0004369L (sv) 2002-05-29

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