EP4159339A1 - Pressenelement einer presse, pressentisch sowie presse - Google Patents

Pressenelement einer presse, pressentisch sowie presse Download PDF

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Publication number
EP4159339A1
EP4159339A1 EP22196538.7A EP22196538A EP4159339A1 EP 4159339 A1 EP4159339 A1 EP 4159339A1 EP 22196538 A EP22196538 A EP 22196538A EP 4159339 A1 EP4159339 A1 EP 4159339A1
Authority
EP
European Patent Office
Prior art keywords
press
piece
pressure piece
holding piece
damping
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.)
Pending
Application number
EP22196538.7A
Other languages
German (de)
English (en)
French (fr)
Inventor
Martin Schmeink
Johannes Wall
Mark Morbach
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.)
L Schuler GmbH
Original Assignee
L Schuler GmbH
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 L Schuler GmbH filed Critical L Schuler GmbH
Publication of EP4159339A1 publication Critical patent/EP4159339A1/de
Pending legal-status Critical Current

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Classifications

    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/02—Die-cushions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/062—Press plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/061—Cushion plates

Definitions

  • the invention relates to a press element of a press, in particular a press for forming sheet metal, with a damping device for compensating for a dimensional fluctuation between an extended end position and a shortened end position between the press element and an additional element assigned to the press element during a pressing process along a longitudinal axis, the damping device is arranged between the press element and the associated additional element during the pressing process, the damping device having a holding piece, a pressure piece and a damping element, the holding piece being fixed to the pressing element, the pressure piece being assigned to the additional element during the pressing process and the pressure piece being removed from the holding piece by means of a first limiting device is held on the press element and the damping element is arranged between the press element and the pressure piece by means of the holding piece with a prestress applied along the longitudinal axis and compensates for the dimensional fluctuations during the pressing process without play by means of an elastic dimensional change along the longitudinal axis. Furthermore, the invention relates to a press table with one press element or several press elements of the type
  • Presses, in particular presses for forming sheet metal often have additional elements, such as press bolts or holding stamps, in particular for holding or guiding a sheet metal, with this additional element, in particular the respective press bolt, being subject to dimensional fluctuations.
  • Such dimensional fluctuations can arise on the one hand from temperature fluctuations, on the other hand also from manufacturing tolerances.
  • additional elements of varying length for example, a corresponding metal sheet is picked up only uncertainly or unevenly and deformed or held unevenly.
  • different damping devices are known.
  • hydraulic damping devices are known in which hydraulic compensation takes place between different additional elements, for example different press rams.
  • Adjustable additional elements for example by means of a thread, are also known.
  • a corresponding arrangement is disclosed in the DE 10 2014 004 521 B4 .
  • active adjustment mechanisms for example for pressure bolts or plungers, are known.
  • active adjustment mechanisms for example for pressure bolts or plungers.
  • DE 10 2017 214 660 A1 the DE 10 2017 214 660 A1 called.
  • the DE 10 2017 206 753 A1 discloses an apparatus and method for shim adjustment of a die cushion apparatus.
  • several height direction positions of several drawing pins by means several hydraulic cylinders can be adjusted.
  • individual positions of the hydraulic cylinders can be stored for renewed adjustment.
  • the DE 103 53 350 A1 concerns details of a press.
  • Spring pins for a press are supported here by means of an elastic element such as disc springs, so that a load on individual spring pins is balanced during a pressing process.
  • the object of the invention is to improve the prior art.
  • a press element of a press in particular a press for forming sheet metal, with a damping device for compensating for a dimensional fluctuation between an extended end position and a shortened end position between the press element and an additional element assigned to the press element during a pressing process along a longitudinal axis
  • the damping device is arranged between the press element and the associated additional element during the pressing process, the damping device having a holding piece, a pressure piece and a damping element, the holding piece being fixed to the pressing element, the pressure piece assigned to the additional element during the pressing process and the pressure piece being detached from the holding piece by means of a first limiting device is held on the press element and the damping element by means of the holding piece with a is arranged along the longitudinal axis applied prestress between the press element and the pressure piece and compensates for the dimensional fluctuations during the pressing process without play by an elastic change in dimension along the longitudinal axis.
  • the holding piece has an opening running along the longitudinal axis, the pressure piece being in mechanical contact
  • Such a press element with a damping device is simple in construction, does not require any electrical or hydraulic components and is also easy to maintain. A play-free compensation of a corresponding dimensional fluctuation is possible by means of the prestressing, the elastic dimensional change of the damping element is used here, so that no further mechanical components or complicated technical arrangements are necessary.
  • a prestressing force can be set by the prestressing, so that the damping device can be selected and designed according to the desired use. Overall, the press element and the damping device can thus be constructed in a compact manner.
  • a "press element" of a press is, for example, a fixed component or also part of a movable component of a press, it being possible for the damping device to be connected to this press element. It is irrelevant whether the press element is arranged on a fixed or on a movable side of the press.
  • a press element can be any component of a press.
  • such a press element is a mechanical component of the press, which is used, for example, to absorb or transmit a force, for example a press ram, a press bolt, a pressure beam of a drawing device or a press table.
  • a "press” is a machine tool for forming.
  • such a press can be bound away or also force-bound, in which case a press ram, which serves as a movable part of the press, acts on a so-called press table in a press.
  • a corresponding force between the press ram and the press table is then used, for example, to form sheet metal.
  • a "press ram” refers to the movable active element of the press, ie, for example, a hydraulic cylinder or the part of a crank mechanism that is mechanically effective for a pressing process.
  • a "press bolt” is usually an elongated, rod-shaped component of a press and is used, for example, in a sheet metal pressing process, in order to temporarily hold partial areas of the sheet metal during the pressing process and thus to stop the forming process steer.
  • a press can in particular have a plurality of press bolts, for example on a circumference of the sheet metal to be processed.
  • forming of sheet metal is, for example, deep drawing, compression molding or also contour pressing on a sheet metal, ie in particular a sheet metal or steel sheet. Such a forming of sheet metal can be used, for example, to produce the shape of a door of an automobile or other body parts.
  • a "damping device” describes, for example, a part of the press element which is used directly to compensate for the dimensional fluctuation and, in addition to compensating for the dimensional fluctuation, can also implement mechanical damping, ie, for example, a reduction in vibrations.
  • Such a damping device can, for example, be a compensating element for a dimensional fluctuation.
  • a "dimensional fluctuation" between an extended end position and a shortened end position describes, for example, a thermal lengthening of a press bolt, a production-related shortening of such a press bolt or some other compression, lengthening or shortening of corresponding components of the press.
  • a dimensional fluctuation can be caused not only by a press billet, but also, for example, by the press table, a press ram, another receiving means or other components.
  • the dimensional fluctuation relates in particular to the desired precision that can be achieved on the component, for example on the processed sheet metal, which is to be subjected to forming, for example.
  • An "extended end position” describes the greatest possible dimensional fluctuation that can still be compensated for by the damping device, while the "shortened end position” describes the smallest possible position of the damping device for compensating for corresponding dimensional fluctuations.
  • a “limiting device” is used to limit the corresponding movement of a pressure pad. Such a limiting device acts mechanically on the pressure piece and limits its path of movement.
  • an “additional element” is, for example, a press bolt or another component of the press, it being irrelevant with regard to the dimensional fluctuation whether this is triggered or caused by the press element, by the additional element or by another component of the press.
  • the additional element is usually a movable or interchangeable element, the press element being connected to the press in a stationary manner, for example.
  • the "longitudinal axis" describes the direction along which the dimensional variation is to be compensated. Such a longitudinal axis is not precisely defined mathematically. deviations, which due to technical reasons, for example +10° to -10° in relation to a full angle of 360° must be taken into account.
  • a “holding piece” is that component which is fixed to the press element and holds the pressure piece and thus the damping element on the press element.
  • a holding piece can be, for example, a mechanical clamp, a form-fitting component, a force-fitting component or a component of a different design, which can hold the pressure piece and thus the damping element accordingly on the press element.
  • a “thrust piece” serves to transfer forces introduced by the additional element into the damping element.
  • the pressure piece serves as wear protection for the damping element.
  • the "damping element” is a component which compensates for the dimensional fluctuation by means of an elastic dimensional change along the longitudinal axis.
  • a damping element is an elastic component which generates or absorbs forces as a function of travel.
  • a “preload” describes the state in which the damping element is subject to compressive stress, for example, specifically when the press element and/or the damping device is in the mounted resting state. This compensates for the corresponding tolerances, a preload force can be set and the pressing process can be carried out without play. In doing so, the preload set in particular by the dimensioning of the damping element and the other components and according to the preload.
  • the holding piece limits the pressure piece along the longitudinal axis by means of the first limiting device in a form-fitting manner in the direction of the extended end position relative to the press element, so that a positive end stop is formed for the pressure piece in the direction of the extended end position.
  • a mechanically defined positive end stop is formed by a "positive" pick-up, which implements a corresponding delimitation by two geometries running in opposite directions.
  • Such a “positive end stop” is a path limitation in the direction of the extended end position, i.e. along the longitudinal axis up to the extended end position, so that the pressure piece cannot be moved further in the direction of the extended end position via this positive end stop.
  • the press element limits the pressure piece along the longitudinal axis by means of a second limiting device in a form-fitting manner in the direction of the shortened end position compared to the first press element, so that a negative end stop is formed for the pressure piece in the direction of the shortened end position, with the press element in particular having a pressure surface of the Pressure piece for forming the second limiting device of a contact surface receives a form fit.
  • a defined, form-fitting end stop is thus also formed in the direction of the shortened end position, so that the travel of the damping element is clearly limited. If the pressure piece has a pressure surface, this can be accommodated by the press element over a large area and thus in a form-fitting manner, specifically on a contact surface.
  • a “pressure surface” is, for example, a flat surface of the pressure piece, which runs parallel to a surface of the press element, in contrast, the "contact surface” is a corresponding, corresponding surface on the press element.
  • An "opening”, which can also be called “breakthrough” or “borehole”, is an omission of material within the holding piece through which the pressure piece can pass and act on the additional element and/or interact with the additional element.
  • the pressure piece and the additional element are mechanically contacted through the opening.
  • the first limiting device is designed as a concentrically arranged step opposite a corresponding, concentrically arranged step on the pressure piece.
  • a rotationally symmetrical pressure piece can thus be used, for example, with a corresponding holding piece also being designed to be rotationally symmetrical can.
  • the press element and the corresponding damping device can thus be produced in a particularly compact manner.
  • the holding piece is detachably connected to the press element.
  • the damping element is thus accommodated in an exchangeable manner between the holding piece and the press element, it being possible in particular for the holding piece to be fixed to the press element by means of screws.
  • the holding piece can be removed from the press element by loosening the screws, so that the damping element and/or also a corresponding pressure piece can be loosened and replaced.
  • Replaceable describes precisely this possibility of exchanging different components of the press element and/or removing and exchanging corresponding components for the press element.
  • the pressure piece has a centering means for the damping element, so that the damping element can be fixed radially opposite the pressure piece by the centering means in a centering receptacle corresponding to the centering means.
  • the damping element is held securely and reliably by means of the centering receptacle in interaction with the centering means, in particular in the case of a described concentric arrangement of the components.
  • the damping element can have the shape of a so-called donut, that is to say it can have a round, disk-like shape with a concentric hole in the middle.
  • a “centering means” in this context is, for example, a particularly concentric geometric shape on the pressure piece, which interacts with a corresponding "centering receptacle", i.e. a corresponding inverse geometry, in order to be able to fix the damping element radially with respect to the pressure piece.
  • the damping element has an elastomer, in particular a PU (polyurethane) and/or a spring, in particular a disc spring or a plurality of disc springs.
  • a PU polyurethane
  • a spring in particular a disc spring or a plurality of disc springs.
  • An “elastomer” is a dimensionally stable but elastically deformable plastic whose glass transition point is below the service temperature. Such a plastic can deform elastically under tensile and compressive loads, but then returns to its original, undeformed shape. During this elastic deformation, forces are absorbed as a function of path or in relation to a component acting on the elastomer it acts.
  • Such an elastomer is, for example, rubber, caoutchouc or silicone rubber.
  • a “spring” is a generally metallic component that can be elastically deformed and thus absorb and return corresponding forces, analogous to elastomers.
  • a “cup spring” is a special case of a spring, with a cup spring being able to absorb elastic forces by buckling deformation of a flat spring element which is joined together in the shape of a ring.
  • the object is achieved by a press table with a press element or with a plurality of press elements according to one of the previously described embodiments, the press element being connected to the press table or formed by the press table.
  • a press table that can be variably adapted to corresponding dimensional fluctuations can be created, for example, by joining a plurality of press elements on a press table or by forming the press element through the press table with a multiplicity of holding means and a multiplicity of pressure pieces and damping elements.
  • a press table can also be exchanged as a fully prepared component when corresponding damping elements or pressure pieces are worn.
  • the object is achieved by a press with a press element or several press elements according to one of the embodiments described above or a press table according to the type described above and in particular an additional element assigned to the press element.
  • a press table 101 with a base 103 is arranged on feet 108 .
  • the press table 101 is part of a press for forming sheet metal, with other components such as the press frame and the press ram not being shown for the sake of simplicity.
  • the press table 101 serves as part of a lower tool or as a holder for a lower tool for forming sheet metal.
  • a removable plate 105 is fastened by means of screw anchors 107 on an upper side of the base frame 103 .
  • the removable plate 105 carries a multiplicity of compensating elements 201 in a matrix-like arrangement along axes 131 and 133 arranged orthogonally to one another.
  • the removable plate 105 can be completely removed from the base 103 after the screw anchors 107 have been loosened and, for example, exchanged if corresponding compensation elements 201 are worn or are to be exchanged for technically differently designed compensation elements.
  • Each compensating element 201 has a holding piece 203 which has a round and concentrically arranged opening 205 . Furthermore, a stop ring 207 is formed concentrically to the opening 205 by means of a shoulder directed in the direction of the removable plate 105 .
  • the holding piece 203 is fastened to the exchangeable plate 105 by means of screws 211 which are passed through bores 213 . The heads of the screws 211 are accommodated in pockets 215 so that the screws do not protrude beyond the contours of the holding piece 203.
  • the outer contour of the holding piece 203 is square, corresponding screws 211 are arranged at each corner of the square.
  • the opening 205 and the stop ring 207 are arranged concentrically to a longitudinal axis 231 , the longitudinal axis 231 in turn being arranged centrally within the square outline of the holding piece 203 .
  • the longitudinal axis 231 is perpendicular to the removable plate 105. Along this longitudinal axis 231 also runs a Closing direction of the press (not shown), in which the press table 101 is arranged as described above.
  • a pressure piece 301 is arranged in the opening 205 .
  • the pressure piece 301 is round and arranged in the opening 205 along a possible direction of movement parallel to the longitudinal axis 231 .
  • the pressure piece is shaped in such a way that it reaches through the opening 205 and thus forms a stamping surface 303 pointing away from the exchangeable plate 105 .
  • the stamping surface 303 is arranged in such a way that the longitudinal axis 231 runs parallel to the normal of the stamping surface 303 and the stamping surface 303 is arranged essentially parallel to the surface of the interchangeable plate 105 .
  • the stamping surface 303 receives a respective press bolt (not shown), which is, for example, a respective movable component of a lower tool.
  • a damping element 401 is arranged in a prestressed manner between the pressure piece 301 and the exchangeable plate 105 .
  • the corresponding dimensions of the holding piece 203, the position of the stop ring 207, the position of a stop ring 305 acting opposite the stop ring 207 on the pressure piece 301 and the height of the damping element 401 along the longitudinal axis 231 are dimensioned such that the damping element receives a desired prestress.
  • the damping element 401 is formed from an elastomer and is ring-shaped.
  • a centering pin 307 which runs in the direction of the removable plate 105 from the pressure piece along the longitudinal axis 231, engages through a centrally located hole in the Damping element 401 and rests on an inner surface 405.
  • An outer surface 403 of the cushioning element 401 is arranged at a distance from the holding piece 203 so that the cushioning element 401 can expand.
  • the pressure piece 301 also has a stop surface 309 which is aligned in the direction of a contact surface 106 of the removable plate 105 . In the unloaded state, there is a distance between the contact surface 106 and the stop surface 309 .
  • corresponding press bolts are also loaded by a metal sheet (not shown) lying between the upper tool and the lower tool. It is assumed here that the pressure bolts have length fluctuations along the longitudinal axis 231 . By hitting the stop ring 207 with the stop ring 305 of the pressure piece 301, an upper end position of the corresponding pressure piece 301 is fixed.
  • the pressure piece 301 is held in this position by the preload of the damping element 401 .
  • the pre-stressing is adjusted to the desired pressure of the press bolt on, for example, a machined sheet metal. If the press bolt is now longer than originally tolerated, the pressure piece 301 will slide in the opening 205 of the holding piece 203 in the direction of the exchangeable plate 105 and thereby compress the cushioning element 401 . The corresponding increase in force on the press bolt is determined by the hardness of the damping element 401.
  • the cushioning element then expands radially, with the outer surface 403 urging towards the support piece 203, but being able to expand. Likewise, the damping element 401 can expand elastically inwards.
  • the stop surface 309 of the pressure piece 301 runs onto the contact surface 106 of the interchangeable plate 105. At this point, the path of the pressure piece 301 is limited, so that further compensation does not take place.
  • the corresponding permissible path of the pressure piece 301 in the holding piece 203 is matched to the tolerance of the length of the respective press bolt, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Presses And Accessory Devices Thereof (AREA)
EP22196538.7A 2021-10-01 2022-09-20 Pressenelement einer presse, pressentisch sowie presse Pending EP4159339A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021125551.1A DE102021125551B4 (de) 2021-10-01 2021-10-01 Pressenelement einer Presse, Pressentisch sowie Presse

Publications (1)

Publication Number Publication Date
EP4159339A1 true EP4159339A1 (de) 2023-04-05

Family

ID=83398431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22196538.7A Pending EP4159339A1 (de) 2021-10-01 2022-09-20 Pressenelement einer presse, pressentisch sowie presse

Country Status (3)

Country Link
EP (1) EP4159339A1 (zh)
CN (1) CN115923231A (zh)
DE (1) DE102021125551B4 (zh)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829074A (en) * 1971-12-22 1974-08-13 Haemmerle Ag Maschf Work-table on machines for processing metal
DE9208777U1 (de) * 1991-10-30 1993-03-04 O & K Orenstein & Koppel Ag, 1000 Berlin Einrichtung zum elastischen Dämpfen des Stoßes von zwei sich aufeinander zu bewegenden Bauteilen
DE10353350A1 (de) 2002-11-14 2004-05-27 Komatsu Artec Ltd., Komatsu Federungsstift, Verschleissplatte, Lastabstützvorrichtung, Gesenkfederung, Presse und Pressverfahren
US20080016929A1 (en) * 2004-10-01 2008-01-24 Strömsholmen Ab Striker Plate And Sheet-Metal Forming Tool Comprising Such A Striker Plate
DE102014004521B4 (de) 2014-03-28 2017-08-17 Audi Ag Pressenvorrichtung zur Umformung eines Blechbauteils
DE102017206753A1 (de) 2016-04-22 2017-10-26 Aida Engineering, Ltd. Vorrichtung und Verfahren zur Ausgleichsscheibeneinstellung einer Ziehkissenvorrichtung
DE102017214660A1 (de) 2017-08-22 2019-02-28 Bayerische Motoren Werke Aktiengesellschaft Druckbolzen einer Presse sowie Presse mit Druckbolzen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829074A (en) * 1971-12-22 1974-08-13 Haemmerle Ag Maschf Work-table on machines for processing metal
DE9208777U1 (de) * 1991-10-30 1993-03-04 O & K Orenstein & Koppel Ag, 1000 Berlin Einrichtung zum elastischen Dämpfen des Stoßes von zwei sich aufeinander zu bewegenden Bauteilen
DE10353350A1 (de) 2002-11-14 2004-05-27 Komatsu Artec Ltd., Komatsu Federungsstift, Verschleissplatte, Lastabstützvorrichtung, Gesenkfederung, Presse und Pressverfahren
US20080016929A1 (en) * 2004-10-01 2008-01-24 Strömsholmen Ab Striker Plate And Sheet-Metal Forming Tool Comprising Such A Striker Plate
DE102014004521B4 (de) 2014-03-28 2017-08-17 Audi Ag Pressenvorrichtung zur Umformung eines Blechbauteils
DE102017206753A1 (de) 2016-04-22 2017-10-26 Aida Engineering, Ltd. Vorrichtung und Verfahren zur Ausgleichsscheibeneinstellung einer Ziehkissenvorrichtung
DE102017214660A1 (de) 2017-08-22 2019-02-28 Bayerische Motoren Werke Aktiengesellschaft Druckbolzen einer Presse sowie Presse mit Druckbolzen

Also Published As

Publication number Publication date
DE102021125551B4 (de) 2023-05-04
CN115923231A (zh) 2023-04-07
DE102021125551A1 (de) 2023-04-06

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