EP2603334B1 - Drawing press with a static blank holder - Google Patents

Drawing press with a static blank holder Download PDF

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Publication number
EP2603334B1
EP2603334B1 EP11743835.8A EP11743835A EP2603334B1 EP 2603334 B1 EP2603334 B1 EP 2603334B1 EP 11743835 A EP11743835 A EP 11743835A EP 2603334 B1 EP2603334 B1 EP 2603334B1
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EP
European Patent Office
Prior art keywords
drive
press
slide
tool
press according
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.)
Active
Application number
EP11743835.8A
Other languages
German (de)
French (fr)
Other versions
EP2603334A1 (en
Inventor
Dietmar Schöllhammer
Martin Schmeink
Andreas Dangelmayr
Jürgen Fahrenbach
Hans Hofele
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
Priority claimed from DE201010037950 external-priority patent/DE102010037950B4/en
Application filed by L Schuler GmbH filed Critical L Schuler GmbH
Publication of EP2603334A1 publication Critical patent/EP2603334A1/en
Application granted granted Critical
Publication of EP2603334B1 publication Critical patent/EP2603334B1/en
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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
    • B21D24/04—Blank holders; Mounting means therefor
    • 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
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/10—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by toggle mechanism
    • B30B1/14—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by toggle mechanism operated by cams, eccentrics, or cranks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/266—Drive systems for the cam, eccentric or crank axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/28—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks the cam, crank, or eccentric being disposed below the lower platen or table and operating to pull down the upper platen or slide

Definitions

  • the invention relates to a drawing press, which is particularly suitable for integration in press lines, press lines, hybrid presses or transfer presses for the production of body parts.
  • the first press stage is usually a drawing press, which gives a previously flat board a spatial form. This is done in a pulling tool that clamps the edge of the board, or also allows controlled to slide towards the sheet metal center, while the enclosed by the blank holder part of the sheet between a die and a stamp receives the desired spatial shape.
  • drawing presses have become established in which the stamp is supported in a resting position on a press table and the associated die is held on the vertically movable plunger up and down. The blank holder surrounds the plunger and is pressed down against the force of a die cushion from the edge of the die during the drawing operation.
  • the convex curved sheet side is formed on the sheet metal part above, as it is also desired for the subsequent press stages.
  • Stansvortician in particular are carried out, which is usually required in body parts that the resulting burr on the hollow side, ie the concave side of the sheet metal part is located.
  • the design mentioned here has established itself as a standard. Designs with bottom die and top punch (and overhead plate holder) such as from the DE 10117578 B4 Therefore, they are less commonly used.
  • the deep drawing press has a ram with an upper tool.
  • the press also has on a table construction arranged drawing dies that perform the Tiefziehhub.
  • the plunger is moved with the upper tool in a closed position. Then it is coupled via Switzerlandholme and a hydromechanical locking device with the table construction.
  • the force acting on the upper tool and the plunger is supported by means of the Buchholme on the table construction of the deep drawing press.
  • GB 388,566 A describes a double-acting press.
  • a crankshaft drive actuates a ram with a tool part of the upper tool, while another crankshaft drive acts on another tool part on the upper tool.
  • these two tool parts of the upper tool is associated with a lower tool, wherein a tool part of the lower tool is supported by a fluid cylinder.
  • the forming of a workpiece is carried out by a downward movement of the two tool parts of the upper tool against the lower tool.
  • the pressure in the fluid cylinder, which supports a tool part of the lower tool is set via a valve control.
  • GB 512,631 A describes a double-acting press.
  • the press has a ram with an upper tool, a carriage with a lower tool is moved via an eccentric drive. On the carriage, a sheet holder is further arranged and supported via pressure cylinder. By a coordinated downward movement of the plunger and an upward movement of the carriage with the lower tool is a forming process. It is therefore an object of the invention to provide a press concept and a forming process, with which can be produced with low energy consumption while providing the desired subsequent in the subsequent press stages component orientation, thermoforming.
  • the plunger drive has a blocking position in which forces acting on the plunger are introduced into the press frame under at least largely, if not completely, circumvention of the actual drive source, such as a servomotor.
  • a blocking position is provided for example by an eccentric, a toggle mechanism or a similar gear in the respective extended position.
  • the extended position is the position in which the lever arm of the eccentric (connecting line between the center of rotation of the eccentric and the center of the eccentric) is aligned with the connected connecting rod.
  • the table drive provides the punch stroke, which is required for shaping the sheet metal part, preferably while the ram drive is in blocking position or other rest position.
  • the die rests during the drawing process, in particular, it applies the sheet holding force against the likewise stationary sheet holder.
  • the sheet-holding force is thus preferably initiated statically in the press frame both on the part of the plunger and the die carried by him, as well as on the part of the sheet holder and does not have to be applied by drives.
  • the platen drive need only be uniquely constructed by the plunger drive prior to commencing a pull stroke, after seating the die tool on the board. It is then held statically by the press frame.
  • the sheet holding force can also be applied by a short-stroke plate holder drive.
  • the plate holder drive may also have a blocking position.
  • it can be designed as a short-stroke eccentric drive or as a cam drive, which clamps the sheet metal holder against the edge of the die tool and introduces the clamping forces directly into the press frame.
  • a blocking position is reached here when the eccentric drive is in an extended position or a cam drive is on a cam portion of maximum radius.
  • a movement of the driving servomotor has no or only a negligible minimum sheet holder movement result.
  • the proposed press concept minimizes the power to be applied to the ram drive and the table drive and the power exchange between these drives.
  • the press comes, compared to presses where an intense exchange of energy between ram drive and die cushion takes place, with the same power with smaller drives.
  • the otherwise required total stroke of, for example, 1300 mm in two strokes namely the stroke of the plunger and the stroke of the table, divided.
  • the stroke of the ram mainly serves to open and close the tool
  • the stroke of the table is used for the opening and closing of the tool Method of the stamp and thus to carry out the actual drawing process.
  • the ram stroke can only be 1000 mm and the table lift can be only 300 or 400 mm.
  • the plunger drive can turn out smaller than a conventional drive.
  • the linearly movable table can have a group of passages through which supporting elements extend. These support elements, for example in the form of straight pressure pins, extend through these passages and support the blank holder on an abutment.
  • the abutment is preferably arranged stationary with respect to the press frame. This means that the position of the sheet holder with respect to the press frame is fixed or optionally fixed by a Einsteiivorraum.
  • the sheet holding force is determined by the springing of the press frame.
  • This springing can be in the range of a few millimeters to a few 10 mm.
  • the elastically stored in the press frame energy can be transferred back on the return stroke of the plunger on the ram drive, which further reduces the gross energy consumption of the drawing press.
  • the adjustment drive as explained above may be a short-stroke toggle mechanism or an eccentric gear or the like.
  • the adjustment stroke will typically be at most a few 10 mm. This concept is particularly advantageous when the ram drive drive only with little force in its blocking position and can lock there. In this case, the blank holder force can be applied after blocking the plunger of the short-stroke plate holder drive.
  • the Verstellhub the sheet holder drive is then preferably at least as large as the total occurring springing of the press frame.
  • both the ram drive and the table drive are preferably servomotor drives.
  • the servomotors work on the plunger or the table preferably via gears that have at least one rest position.
  • a rest position is a position in which the reduction between servo motor and plunger or table in at least one point is very large or even infinite. This applies to eccentric gear as well as toggle mechanism in the extended position of the elements involved. Multi-unit transmissions with multiple stretched positions can be used to advantage.
  • the servomotor of the ram drive is operated in reverse operation. It stops near the bottom plunger dead point and thus brings the eccentric and its connecting rod in an extended position.
  • the servo motor In order to move the plunger again after the forming of the sheet metal part in the opposite direction from the bottom dead center, ie to open the tool, the servo motor, if desired, can be rotated in the opposite direction until the plunger has performed the desired stroke.
  • the one of the eccentric continuous rotation angle can be limited to a value ⁇ 180 degrees, or preferably ⁇ 90 degrees. The same applies to the table drive, where the rotation angle can even be limited to values ⁇ 60 ° degrees.
  • FIG. 1 a drawing press 10 is illustrated, which can be used for the production of large sheet metal parts, such as body parts.
  • the drawing press 10 includes a press frame 11, the at least one, preferably a plurality, preferably vertically oriented stand 12, a head 13, which is supported by the uprights 12, and a pedestal 14, which is arranged below or between the uprights 12.
  • the head 13, the stand 12 and the base 14 form a closed frame.
  • a plunger 15 is movably mounted in an example vertical direction of movement 16.
  • For the storage of the plunger 15 are provided for example on the uprights 12 provided linear guides 17th
  • the plunger 15 serves to receive an upper tool part, which is designed as a die tool 18. It is in FIG. 1 shown in section and has a rim 19, which serves for clamping and holding the edge of a workpiece during the drawing process.
  • the workpiece is formed by a board 20 that is, an initially flat sheet.
  • the rim 19 surrounds a tool cavity 21 into which the workpiece is to be deformed.
  • a ram drive 22 which comprises one or more servo motors 23, 24 which are connected via one or more gear 25, 26 with the plunger 15.
  • the two gear 25, 26 are mirror-symmetrical to each other in the present embodiment and each constructed as an eccentric gear. They each include an eccentric 27, 28, which is connected via a connecting rod 29, 30 with the plunger 15.
  • the drawing press 10 has a press table 31, on which a travel table 32 can be arranged.
  • the drive table 32 is used in a known manner the tool change.
  • the drive table 32 carries the lower tool part, to which a tool support 33, with a punch tool 34 arranged thereon and a blank holder 35 belong.
  • the punch tool 34 is a convex die whose upper contour corresponds to the cavity 31. It is surrounded by the rectangular-shaped sheet holder 35 in most cases, wherein the sheet holder 35 and the punch tool 34 are movable relative to each other with respect to the movement direction 16.
  • the unit consisting of the punch tool 34, the tool support 33, the drive table 32 and the press table 31 rests on a table drive 36 which is movable in the direction of movement 16 (see corresponding arrow) in the direction of the plunger 15 and away from it.
  • the press table 31, or its table drive 36 is linearly movable in the press frame on the uprights 12 and / or the base 14 by means of guide means 37 in the direction of movement.
  • To the table drive 36 includes one or more gear 38, 39, which, like the transmission 25, 26, each having a blocking position. They are e.g. designed as an eccentric gear that bring the press table 31 with one or more servomotors 40, 41 in drive connection.
  • the gear 38, 39 each comprise an eccentric 42, 43, which is connected via a connecting rod 44, 45 with the press table 31.
  • the blank holder 35 is supported on suitable abutment elements, for example in the form of pressure pins 46, on an abutment 47.
  • the abutment 47 may be arranged stationary in the simplest case with respect to the base 14. Alternatively, it may be associated with an adjustment device 48 which can adjust the position of the abutment 47 with respect to the direction of movement 16, for example. This is usually done in no-load condition.
  • the adjustment 48 may also be designed so that it can adjust the abutment 47 under load, for example, to specifically influence or regulate the force acting on the blank holder 35 and thus on the drawing edge of the workpiece force.
  • the adjusting apparatus 48 may be in the form of hydraulic cylinders, toggle adjusters, Hubspindelverstellapparaten or the like. Between the abutment 47 and the table drive 36 16 oriented linear guides 49 may be provided in the direction of movement.
  • the drawing press 10 in the in FIG. 2 illustrated position transferred.
  • the servomotors 23, 24 not shown here have the eccentric 27, 28 turned so far that the plunger 15 has reached its bottom dead center.
  • the edge 19 of the die tool 18 sets on the edge of the board 20 and begins to press against the blank holder 35.
  • the blank holder 35 rests on the support elements 46 relentless on the abutment 47, so that now the press frame is stretched in the direction of movement 16.
  • the servomotors 40, 41 are activated, so that the eccentrics 42, 43 with the connecting rods 44, 45 go into an extended position, and thus reach the top dead center of the table drive 36.
  • the punch tool 34 is fully retracted into the die tool 18.
  • the reduction between the servomotors 41, 42 and the press table 31 approaches infinity, so that the punch tool 34 can apply very high pressures to the workpiece.
  • FIG. 4 already illustrates the plunger 15 in the upper position, while the punch tool 34 is still in working position. It will still driven by appropriate rotation of the eccentric 42, 43 down, after which it is only on the plate holder 35, and can be driven out of the drawing press 10 by a workpiece transport device, such as suction spider or the like.
  • the drawing press 10 so far described offers a concept which is suitable for the further use of drawing tools which have hitherto been used in presses with drawing cushions arranged at the bottom.
  • the press table 31 has a group 50 of openings 51, 52, 53, through which the support elements 46 can optionally be inserted therethrough.
  • tools of different sizes can be used, whose blank holder 35 span different distances.
  • the plunger 15 can be moved by the gear 25, 26 pulling when the servomotors 23, 24 are arranged on the base 14.
  • the drive of the press table 31 can be effected in this and in all other embodiments by a single servo motor 40 when the gears of the eccentric 42, 43 mesh with each other or if the eccentric 42, 43 are connected in any other way by suitable transmission means.
  • the eccentric 42, 43 can be reduced to segment wheels, so that a toothing can be limited to a part of the circumference. To reduce costs can This measure also in the eccentrics 27, 28 and their edges find application.
  • FIG. 6 a drive device which can be used either as a ram drive 22 as well as a table drive 36 application. Also, this drive has a rest position when its links 54, 55 are in an extended position. In this extended position causes a rotation of the driving servo motor 23, 24 (or corresponding to 40, 41) no or only an extremely low linear adjustment of the connected member, such as the plunger 15. These forces acting on straight paths by the links 54, 55 at the press frame 11 supported without burdening the servomotors.
  • a tensioning device 60 which serves to clamp the sheet metal holder 35 against the upper plunger 15.
  • the clamping device 60 comprises a plurality of clamping units which are preferably distributed along the annular plate holder 35.
  • To the clamping unit 60 includes a tension member in the form of a clamping bolt 61, which is held on the plunger 15 and on the plate holder 35 and away, at least slightly, is movably mounted.
  • the minimal to be traversed by the clamping bolt 61 movement stroke corresponds to the stroke, which is required after mounting of the plunger 15 on the board 20 for tightening the same. In individual cases, this stroke can be very small and amount to a few millimeters or fractions of a millimeter. Preferably, however, the stroke is much larger and indeed so large that clamping bolt 61 can be substantially completely retracted into the plunger 15.
  • the clamping bolt 61 is associated with a force generating device 62, which is formed here for example in the form of a hydraulic drive device. It is formed by a hydraulic cylinder 63 with two working chambers 64, 65, which are separated from each other by a piston 66.
  • the clamping bolt 61 forms, for example, the piston rod of the piston 66. This is sealed out of the Hyd-raulikzylinder 63 led out.
  • the clamping bolt 61 has at its lower end a locking means 67, for example according to a recess, for example in the form of a locking groove 68 which is formed as an annular groove.
  • a locking groove 68 is limited at the force-generating device 62 side facing a conical edge and on the opposite side with a flat edge.
  • To the clamping unit 60 also includes a clamping bolt 61 associated locking device 69, which has at least one, preferably a plurality of radially movable latch 70, 71. These are by a hydraulic or other actuator 72, z. B. actuated in the form of an annular piston which is arranged coaxially to a clamping bolt 61 receiving bore 73 in an annular chamber. He actuates the latch 35, 36 via a wedge gear and thus can selectively adjust the latch 35, 36 radially.
  • the clamping bolt 61 can extend when opening and closing the tool in the bore 73 and out of this. However, it can also have a length that is so large that it always slides in the bore 73 without extending out of this. It is also possible to provide clamping units with long and clamping units mixed with short bolts, with clamping units with short clamping pins 61, which extend from its bore 73, are arranged where they would otherwise the workpiece for its transport would be in the way.
  • the locking device 69 provides a positive and / or positive connection with the clamping bolt 61 of the plunger.
  • the latches 69, 70 engage in the locking groove 68 on the associated clamping bolt 61.
  • the force-generating device 62 the sheet-holding force between sheet metal holder 35 and the plunger 15 can then be set to save energy.
  • the edge 19 facing and provided for contact with the board 20 plate holder clamping surface 74 is configured just ( FIG. 8 ). That is, the blank holder clamping surface 74 has no projections or depressions, in particular no terminal strips, which lead to a corresponding local indentation in the board 20 during clamping.
  • the surface normal N on the blank holder clamping surface 74 is aligned at any point perpendicular to the associated surface of the board 20 and the surface of the edge 19.
  • the plunger drive 22 is formed by a Füziehebelantrieb.
  • a position sensor 76 may be assigned. Via the position sensor 76, it is detected whether the toggle lever arrangement, to which the lever 75 belongs, has assumed its extended position and thus its blocking position, which is illustrated in FIG.
  • the position sensor 76 is provided with a Control unit 77 connected to this the position sensor signal S to transmit.
  • the position sensor 76 may simultaneously serve as a stop and / or damping element for the lever 75 or have a stop 76a and / or a damping element 76a. As a result, the blocking position can be exactly pre-tanned.
  • the ram drive 22 operates in this embodiment, preferably in oscillating operation, wherein the servo motor or the servomotors of the plunger drive 22 reverse their direction of rotation at the upper and lower end position of the plunger 15 respectively.
  • the ram drive 22 could also be designed as an eccentric drive, as shown in the previous embodiments.
  • the matrix tool 18 can optionally be assigned a permeability sensor 78 which generates a tension signal Z and transmits it to the control unit 77.
  • the tension signal Z describes the tension acting on the board 20 during forming.
  • the permeability sensor 78 detects the permeability of the circuit board 20 that changes due to the tensile stress.
  • the tensile signal z can be used to optimize the sheet holding force of the sheet holder 35 and / or the forming force between the punch tool 34 and the circuit board 20.
  • the table drive 36 is formed by one or more spindle drives 79.
  • Each spindle drive 79 has a spindle 80, a spindle nut 81 and an example according to the spindle nut 81 driving electric motor 82.
  • the electric motor 82 could also drive the spindle 80.
  • the electric motor 82 is preferably designed as a hollow shaft motor with an internal rotor, which coaxially surrounds the driven component, ie the spindle 80 or the spindle nut 81.
  • Such spindle motors 79 are, for example, also provided as an adjusting device 48 for adjusting the plate-holding force of the plate holder 35.
  • the spindle drives 79, or the electric motors 82 of the spindle drives 79, are controlled by the control unit 77.
  • the translation between the spindle nut 81 and the spindle 80 can be chosen in particular in the adjusting device 48 so that a self-locking occurs in the spindle gear.
  • the associated electric motor 82 only has to be operated if the plate holding force has to be changed or readjusted. To maintain a set plate holding force of the electric motor must not be energized.
  • the control unit 77 also controls the ram drive 22 and in the embodiment shown here, a blocking device 83.
  • the blocking device 83 is disposed between the press frame 11, for example, the head 13, and the plunger 15. Regardless of whether the plunger drive 22 is exactly in its blocking position or not, a rigid connection between the plunger 15 and the press frame 11 can be made via blocking device 83. This rigid coupling prevents movement of the plunger 15 in the direction of movement 16 due to the forces acting on the plunger 15 forces by the blank holder 35 or the punch tool 34th
  • the blocking device 83 between a coupling position K (solid lines in FIG. 9 ) and a release position F (dotted lines in FIG. 9 ) are switched.
  • the blocking device 83 transversely to the direction of movement 16 slidable blocking elements 84, which cooperate in their coupling position K with counter-elements 85 on the plunger 15.
  • the blocking elements 84 are aligned with their respective associated counter element 85 in the direction of movement 16 and abut against each other at associated end faces 86.
  • the plunger 15 is therefore supported on the press frame 11 and, according to the example, on the head 13.
  • the coupling position K thus a very rigid coupling during the forming process of the board 20 between the plunger 15 and the press frame 11 is ensured.
  • no holding force must be generated, which improves the energy efficiency of the drawing press 10.
  • the blocking elements 84 are offset transversely to the direction of movement 16 to the counter-elements 85, so that by the plunger drive 22 of the plunger 15 can be moved from its lower end position in the direction of movement 16 upwards.
  • the blocking device 83 For moving the blocking elements 84 between the coupling position K and the release position F, the blocking device 83 has a linear drive 87, which is controlled by the control unit 77.
  • a linear drive 87 can serve, for example, a spindle drive, by an electric motor is controlled. Other linear drives can also be used.
  • the displaceable blocking elements 84 can also be arranged on the plunger 15. Then the counter-elements 85 are arranged on the press frame 11 and preferably on the head 13.
  • the adjusting device 48 may then be assigned to an existing on the plunger 15 edge part, which cooperates with the plate holder 35 for clamping the board and is movable in the direction of movement 16 by the adjusting device 48.
  • the drawing press 10 has an abutment 47 for supporting a stationary plate holder 35, which is part of a tool and can be supported on the press frame 11 via the abutment 47.
  • the blank holder 35 is associated with a tappet 15 with a die tool 18, wherein the plunger 15 is moved via a ram drive with blocking position.
  • the blocking position is achieved for example by a gear 22 that transmits in the blocking position no movement from the transmission output to the driving servomotor 23 and / or 24.
  • this is achieved by an eccentric gear 25, 26, when this is in an extended position.
  • the associated in the drive table 32 is raised or lowered by the press table 31 via a table drive 36.
  • the table drive 36 is preferably again a servomotor drive with a non-linear gear, for example an eccentric gear.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)

Description

Die Erfindung betrifft eine Ziehpresse, die sich insbesondere für die Integration in Pressenstraßen, Pressenlinien, Hybridpressenanlagen oder Transferpressen zur Herstellung von Karosseriebauteilen eignet.The invention relates to a drawing press, which is particularly suitable for integration in press lines, press lines, hybrid presses or transfer presses for the production of body parts.

Bei der Herstellung von Karosserieteilen oder anderen großflächigen, räumlich geformten Blechteilen ist die erste Pressenstufe meist eine Ziehpresse, die einer bis dahin ebenen Platine eine räumliche Form gibt. Dies erfolgt in einem ziehwerkzeug, das den Rand der Platine klemmend festhält, bzw. auch kontrolliert zum Blechzentrum hin gleiten lässt, während der von dem Blechhalter umschlossene Teil des Blechs zwischen einer Matrize und einem Stempel die gewünschte räumliche Form erhält. Es haben sich dabei heute Ziehpressen etabliert, bei denen der Stempel auf einem Pressentisch ruhend gelagert und die zugeordnete Matrize an dem vertikal auf und ab bewegbaren Stößel gehalten ist. Der Blechhalter umgibt den Stößel und wird gegen die Kraft eines Ziehkissens von dem Rand der Matrize während des Ziehvorgangs nach unten gedrückt. Bei dieser Grundkonfiguration entsteht die konvexgewölbte Blechseite auf dem Blechteil oben, wie es für die nachfolgenden Pressenstufen auch gewünscht ist. In den nachfolgenden Pressenstufen werden insbesondere auch Stansvorgänge durchgeführt, wobei es bei Karosserieteilen in der Regel erforderlich ist, dass der entstehende Stanzgrat auf der Hohlseite, d.h. der konkav gewölbten Seite des Blechteils liegt. Nachdem Wendestationen und dergleichen zwischen den einzelnen Pressenstufen abzulehnen sind, hat sich die hier angesprochene Bauform als Standart etabliert. Bauformen mit unten liegender Matrize und oben liegendem Stempel (sowie oben liegenden Blechhalter) wie beispielsweise aus der DE 10117578 B4 bekannt, kommen deshalb seltener zur Anwendung.In the production of body parts or other large-scale, spatially shaped sheet metal parts, the first press stage is usually a drawing press, which gives a previously flat board a spatial form. This is done in a pulling tool that clamps the edge of the board, or also allows controlled to slide towards the sheet metal center, while the enclosed by the blank holder part of the sheet between a die and a stamp receives the desired spatial shape. Today, drawing presses have become established in which the stamp is supported in a resting position on a press table and the associated die is held on the vertically movable plunger up and down. The blank holder surrounds the plunger and is pressed down against the force of a die cushion from the edge of the die during the drawing operation. In this basic configuration, the convex curved sheet side is formed on the sheet metal part above, as it is also desired for the subsequent press stages. In the following press stages Stansvorgänge in particular are carried out, which is usually required in body parts that the resulting burr on the hollow side, ie the concave side of the sheet metal part is located. After turning stations and the like are to be rejected between the individual press stages, the design mentioned here has established itself as a standard. Designs with bottom die and top punch (and overhead plate holder) such as from the DE 10117578 B4 Therefore, they are less commonly used.

Pressen, der Eingangs genannten Art, mit oben liegender Matrize und unten liegendem ruhend gelagertem Stempel sind beispielsweise aus der DE 10 2006 025271 B3 bekannt. Nachdem erkannt worden ist, dass bei diesem Konzept an dem Ziehkissen große Energiemengen umgesetzt und meist vernichtet werden, wobei diese Energiemengen von dem Stößel aufgebracht werden müssen, indem dieser den Blechhalter beim Ziehvorgang niederdrückt, schlägt diese Druckschrift die Rückgewinnung der an dem Ziehkissen geleisteten Arbeit bzw. Energie vor, indem dort die Blechhalterkraft über Servomotoren und reibungsarme Spindelgewindetriebe aufgebracht wird. Die an dem Servomotoren ankommende Energie kann rückgespeist werden, indem diese Motoren im Generatorbetrieb arbeiten.Presses, the type mentioned above, with overhead die and lying down resting stamp are for example from DE 10 2006 025271 B3 known. After it has been recognized that in this concept, large amounts of energy are converted to the die cushion and usually destroyed, these amounts of energy must be applied by the plunger by this depresses the blank holder during the drawing, this document proposes the recovery of the work done on the die cushion or Energy by the sheet metal holder force is applied via servo motors and low-friction spindle screws. The energy arriving at the servomotor can be fed back by operating these motors in generator mode.

Bei der Energierückgewinnung sind Energieverluste unvermeidlich.Energy recovery is inevitable in energy recovery.

Aus DE 195 11 379 A1 ist eine Tiefziehpresse bekannt. Die Tiefziehpresse weist einen Stößel mit einem Oberwerkzeug auf. Die Presse weist außerdem an einer Tischkonstruktion angeordnete Ziehstempel auf, die den Tiefziehhub ausführen. Zunächst wird der Stößel mit dem Oberwerkzeug in eine Schließstellung bewegt. Anschließend wird er über Zugholme und eine hydromechanische Verriegelungseinrichtung mit der Tischkonstruktion gekoppelt. Beim Ausführen des Tiefziehhubs durch die Ziehstößel wird die auf das Oberwerkzeug und den Stößel einwirkende Kraft über die Zugholme an der Tischkonstruktion der Tiefziehpresse abgestützt.
GB 388,566 A beschreibt eine doppelt wirkende Presse. Ein Kurbelwellenantrieb betätigt einen Stößel mit einem Werkzeugteil des Oberwerkzeugs, während ein weiterer Kurbelwellenantrieb auf ein anderes Werkzeugteil am Oberwerkzeug einwirkt. Am Tisch ist diesen beiden Werkzeugteilen des Oberwerkzeugs ein Unterwerkzeug zugeordnet, wobei ein Werkzeugteil des Unterwerkzeugs über einen Fluidzylinder abgestützt ist. Das Umformen eines Werkstücks erfolgt durch eine Abwärtsbewegung der beiden Werkzeugteile des Oberwerkzeugs gegen das unterwerkzeug. Dabei wird über eine Ventilsteuerung der Druck im Fluidzylinder, das einen Werkzeugteil des Unterwerkzeugs abstützt, eingestellt.Out DE 195 11 379 A1 is a deep drawing press known. The deep drawing press has a ram with an upper tool. The press also has on a table construction arranged drawing dies that perform the Tiefziehhub. First, the plunger is moved with the upper tool in a closed position. Then it is coupled via Zugholme and a hydromechanical locking device with the table construction. When the deep drawing stroke is carried out by the drawing plungers, the force acting on the upper tool and the plunger is supported by means of the Zugholme on the table construction of the deep drawing press.
GB 388,566 A describes a double-acting press. A crankshaft drive actuates a ram with a tool part of the upper tool, while another crankshaft drive acts on another tool part on the upper tool. At the table these two tool parts of the upper tool is associated with a lower tool, wherein a tool part of the lower tool is supported by a fluid cylinder. The forming of a workpiece is carried out by a downward movement of the two tool parts of the upper tool against the lower tool. In this case, the pressure in the fluid cylinder, which supports a tool part of the lower tool, is set via a valve control.

Auch GB 512,631 A beschreibt eine doppelt wirkende Presse. Die Presse hat einen Stößel mit einem Oberwerkzeug, ein Schlitten mit einem Unterwerkzeug wird über einen Exzenterantrieb bewegt. An dem Schlitten ist ferner ein Blechhalter angeordnet und über Druckzylinder abgestützt. Durch eine koordinierte Abwärtsbewegung des Stößels und eine Aufwärtsbewegung des Schlittens mit dem Unterwerkzeug erfolgt ein Umformvorgang.
Es ist deshalb Aufgabe der Erfindung, ein Pressenkonzept und ein Umformverfahren anzugeben, mit dem sich unter Erbringung der im nachfolgenden sich anschließenden Pressenstufen gewünschten Bauteilorientierung, Tiefziehbauteile mit geringem Energieaufwand herstellen lassen.Also GB 512,631 A describes a double-acting press. The press has a ram with an upper tool, a carriage with a lower tool is moved via an eccentric drive. On the carriage, a sheet holder is further arranged and supported via pressure cylinder. By a coordinated downward movement of the plunger and an upward movement of the carriage with the lower tool is a forming process.
It is therefore an object of the invention to provide a press concept and a forming process, with which can be produced with low energy consumption while providing the desired subsequent in the subsequent press stages component orientation, thermoforming.

Diese Aufgabe mit der Ziehpresse nach Anspruch 1 bzw. dem Verfahren nach Anspruch 14 gelöst:

  • Die erfindungsgemäße Ziehpresse weist einen Stößel zur Aufnahme eines Matrizenwerkzeugs und einen angetriebenen Tisch zur Aufnahme eines Stempelwerkzeugs auf. Der Stößel und der Tisch sind dadurch aufeinander zu und voneinander weg kontrolliert bewegbar. Mit anderen Worten, die Ziehpresse weist zwei in einer Line gegeneinander bewegbare Maschinenelemente, nämlich den Stößel und den Pressentisch, auf, die den Ziehvorgang gemeinsam durchführen. Dabei obliegt dem Stößel nur noch die reduzierte Aufgabe des Öffnens und Schließens des Werkzeugs und das Festklemmen des Ziehrands des Werkstücks. Den Ziehhub erbringt der Pressentisch durch Bewegung des Stempelwerkzeugs bei ruhendem Stößel und ruhendem Blechhalter.
This object is achieved with the drawing press according to claim 1 or the method according to claim 14:
  • The drawing press according to the invention has a plunger for receiving a Matrizenwerkzeugs and a driven table for receiving a punch tool. The plunger and the table are thus controlled towards each other and controlled from each other. In other words, the drawing press has two in a line against each other movable machine elements, namely the ram and the press table, on which carry out the drawing process together. The ram only has the reduced task of opening and closing the tool and clamping the drawing edge of the workpiece. The drawing stroke provides the press table by movement of the punch tool with resting plunger and stationary sheet holder.

Der Stößelantrieb weist eine Blockierstellung auf, in der auf den Stößel einwirkende Kräfte unter zumindest weitgehender, wenn nicht vollständiger Umgehung der eigentlichen Antriebsquelle, wie beispielsweise eines Servomotors, in das Pressengestell eingeleitet werden. Eine solche Blockierstellung wird beispielsweise von einem Exzentergetriebe, einem Kniehebelgetriebe oder einem ähnlichen Getriebe in der jeweiligen Strecklage erbracht. Bei einem Exzentergetriebe ist die Strecklage diejenige Lage, in der der Hebelarm des Exzenters (Verbindungslinie zwischen Drehzentrum des Exzenters und Mittelpunkt des Exzenters) mit dem angeschlossenem Pleuel fluchtet.The plunger drive has a blocking position in which forces acting on the plunger are introduced into the press frame under at least largely, if not completely, circumvention of the actual drive source, such as a servomotor. Such a blocking position is provided for example by an eccentric, a toggle mechanism or a similar gear in the respective extended position. In an eccentric gear, the extended position is the position in which the lever arm of the eccentric (connecting line between the center of rotation of the eccentric and the center of the eccentric) is aligned with the connected connecting rod.

Der Tischantrieb erbringt den Stempelhub, der zur Formgebung des Blechteils erforderlich ist, vorzugsweise während sich der Stößelantrieb in Blockierstellung oder einer sonstigen Ruhestellung befindet. Die Matrize ruht während des Ziehvorgangs, wobei sie insbesondere die Blechhaltekraft gegen den ebenfalls ruhenden Blechhalter aufbringt. Die Blechhaltekraft wird somit vorzugsweise sowohl seitens des Stößels und der von ihm getragenen Matrize, wie auch seitens des Blechhalters statisch in das Pressengestell eingeleitet und muss nicht von Antrieben aufgebracht werden.The table drive provides the punch stroke, which is required for shaping the sheet metal part, preferably while the ram drive is in blocking position or other rest position. The die rests during the drawing process, in particular, it applies the sheet holding force against the likewise stationary sheet holder. The sheet-holding force is thus preferably initiated statically in the press frame both on the part of the plunger and the die carried by him, as well as on the part of the sheet holder and does not have to be applied by drives.

Dies senkt die zum Antrieb des Stößels wie auch zum Antrieb des Tischs erforderliche Leistung erheblich. Die für die Bewegung des Stößels erforderliche Leistung ist gering. Abgesehen von der für das dynamische Beschleunigen und Abbremsen des Stößels und der Matrize erforderlichen Leistung muss von dem Stößelantrieb lediglich vor Beginn eines Ziehhubs, nach dem Aufsetzen den Matrizenwerkzeugs auf der Platine, die Blechhaltekraft einmalig aufgebaut werden. Sie wird dann von dem Pressengestell statisch gehalten. Alternativ kann die Blechhaltekraft auch von einem kurzhubigen Blechhalterantrieb aufgebracht werden. Auch der Blechhalterantrieb kann eine Blockierstellung aufweisen. Z.B. kann er als kurzhubiger Exzenterantrieb oder als Nockenantrieb ausgebildet sein, der den Blechhalter gegen den Rand des Matrizenwerkzeugs spannt und die Spannkräfte direkt in das Pressengestell einleitet. Eine Blockierstellung ist hier erreicht, wenn der Exzenterantrieb in Strecklage steht oder ein Nockenantrieb auf einem Nockenabschnitt maximalen Radius steht. Eine Bewegung des antreibenden Servomotors hat hier keine oder nur eine vernachlässigbar minimale Blechhalterbewegung zur Folge.This considerably reduces the power required to drive the ram as well as to drive the table. The power required to move the plunger is low. apart of the power required to dynamically accelerate and decelerate the plunger and die, the platen drive need only be uniquely constructed by the plunger drive prior to commencing a pull stroke, after seating the die tool on the board. It is then held statically by the press frame. Alternatively, the sheet holding force can also be applied by a short-stroke plate holder drive. The plate holder drive may also have a blocking position. For example, it can be designed as a short-stroke eccentric drive or as a cam drive, which clamps the sheet metal holder against the edge of the die tool and introduces the clamping forces directly into the press frame. A blocking position is reached here when the eccentric drive is in an extended position or a cam drive is on a cam portion of maximum radius. A movement of the driving servomotor has no or only a negligible minimum sheet holder movement result.

Zum Antrieb des Tischs ist nur die Verformungsarbeit für die Platine zu leisten.To drive the table is only the work of deformation for the board to afford.

Das vorgestellte Pressenkonzept minimiert die an dem Stößelantrieb und dem Tischantrieb aufzubringende Leistung und den Leistungsaustausch zwischen diesen Antrieben. Insoweit kommt die Presse, im Vergleich zu Pressen bei denen ein intensiver Energieaustausch zwischen Stößelantrieb und Ziehkissen stattfindet, bei gleicher Leistung mit kleineren Antrieben aus.The proposed press concept minimizes the power to be applied to the ram drive and the table drive and the power exchange between these drives. In that regard, the press comes, compared to presses where an intense exchange of energy between ram drive and die cushion takes place, with the same power with smaller drives.

Außerdem ist bei dem vorgestellten Pressenkonzept der sonst erforderliche Gesamthub von beispielsweise 1300 mm auf zwei Hübe, nämlich den Hub des Stößels und den Hub des Tischs, aufgeteilt. Während der Hub des Stößels vor allem dem Öffnen und Schließen des Werkzeugs dient, dient der Hub des Tische zum Verfahren des Stempels und somit zur Durchführung des eigentlichen Ziehvorgangs. Der Stößelhub kann z.B. lediglich 1000 mm betragen und der Tischhub z.B. lediglich 300 oder 400 mm. Auch aus diesem Grund kann der Stößelantrieb kleiner ausfallen als ein herkömmlicher Antrieb.In addition, in the presented press concept the otherwise required total stroke of, for example, 1300 mm in two strokes, namely the stroke of the plunger and the stroke of the table, divided. While the stroke of the ram mainly serves to open and close the tool, the stroke of the table is used for the opening and closing of the tool Method of the stamp and thus to carry out the actual drawing process. For example, the ram stroke can only be 1000 mm and the table lift can be only 300 or 400 mm. Also for this reason, the plunger drive can turn out smaller than a conventional drive.

Das vorgestellte Pressenkonzept gestattet die Weiterbenutzung vorhandener Werkzeugsätze, die an sich für Betrieb mit ruhendem Stempel und während des Ziehvorgangs abwärts bewegtem Blechhalter vorgesehen waren. Auch können herkömmliche Transfereinrichtungen ohne nennenswerte Anpassung weiter verwendet werden. Bei der erfindungsgemäßen Ziehpresse kann der linear bewegliche Tisch eine Gruppe von Durchgängen aufweisen, durch die hindurch sich Abstützelemente erstrecken. Diese Abstützelemente, beispielsweise in Gestalt gerader Druckbolzen, erstrecken sich durch diese Durchgänge und stützen den Blechhalter an einem Widerlager ab. Das Widerlager ist vorzugsweise bezüglich des Pressengestells ortsfest angeordnet. Dies bedeutet, dass die Position des Blechhalters in Bezug auf das Pressengestell fest oder gegebenenfalls über eine Einsteiivorrichtung fest vorgegeben ist. Wird die auf dem Blechhalter liegende Platine von der Matrize gegen den Blechhalter gespannt und geht der Stößelantrieb dann in Blockierstellung (d.h. zum Beispiel sein Getriebe in Strecklage), wird die Blechhaltekraft durch die Auffederung des Pressengestells bestimmt. Diese Auffederung kann im Bereich von wenigen Millimetern bis wenigen 10 mm liegen. Die im Pressengestell elastisch gespeicherte Energie kann beim Rückhub des Stößels auf den Stößelantrieb rück übertragen werden, was den Bruttoenergieverbrauch der Ziehpresse weiter senkt.The proposed press concept allows the continued use of existing tool sets, which were intended for operation with a stationary stamp and during the drawing down moving sheet holder. Also, conventional transfer devices can continue to be used without significant adaptation. In the drawing press according to the invention, the linearly movable table can have a group of passages through which supporting elements extend. These support elements, for example in the form of straight pressure pins, extend through these passages and support the blank holder on an abutment. The abutment is preferably arranged stationary with respect to the press frame. This means that the position of the sheet holder with respect to the press frame is fixed or optionally fixed by a Einsteiivorrichtung. When the board resting on the blank holder is clamped by the die against the blank holder and the plunger drive is then in the blocking position (i.e., its gear in an extended position), the sheet holding force is determined by the springing of the press frame. This springing can be in the range of a few millimeters to a few 10 mm. The elastically stored in the press frame energy can be transferred back on the return stroke of the plunger on the ram drive, which further reduces the gross energy consumption of the drawing press.

Es ist auch möglich, das Widerlager an dem Pressengestell, beispielsweise über Federpakete, federnd abzustützen. Weiter ist es möglich, dem Widerlager einen Versteilantrieb hydraulischer oder mechanischer Natur zuzuordnen. Beispielsweise kann der Versteilantrieb wie oben erläutert ein kurzhubiges Kniehebelgetriebe oder auch ein Exzentergetriebe oder dergleichen sein. Der Verstellhub wird typischerweise allenfalls wenige 10 mm betragen. Dieses Konzept ist insbesondere dann vorteilhaft, wenn der Stößelantrieb nur mit geringer Kraft in seine Blockierstellung fahren und sich dort arretieren kann. In diesem Fall lässt sich die Blechhalterkraft nach Blockierung des Stößels von dem kurzhubigen Blechhalterantrieb aufbringen. Der Verstellhub des Blechhalterantriebs ist dann vorzugsweise mindestens so groß wie die insgesamt auftretende Auffederung des Pressengestells.It is also possible to resiliently support the abutment on the press frame, for example via spring assemblies. Further It is possible to assign the abutment a Versteilantrieb hydraulic or mechanical nature. For example, the adjustment drive as explained above may be a short-stroke toggle mechanism or an eccentric gear or the like. The adjustment stroke will typically be at most a few 10 mm. This concept is particularly advantageous when the ram drive drive only with little force in its blocking position and can lock there. In this case, the blank holder force can be applied after blocking the plunger of the short-stroke plate holder drive. The Verstellhub the sheet holder drive is then preferably at least as large as the total occurring springing of the press frame.

Unabhängig voneinander sind sowohl der Stößelantrieb wie auch der Tischantrieb vorzugsweise Servomotorantriebe. Die Servomotoren arbeiten auf den Stößel bzw. den Tisch vorzugsweise über Getriebe, die mindestens eine Ruhelage aufweisen. Eine Ruhelage ist eine Stellung, bei der die Untersetzung zwischen Servomotor und Stößel bzw. Tisch in wenigstens einem Punkt sehr groß bzw. sogar unendlich wird. Dies gilt für Exzentergetriebe wie auch für Kniehebelgetriebe in der Strecklage der beteiligten Elemente. Mehrgliedrige Getriebe mit mehreren Strecklagen können vorteilhaft verwendet werden.Independently of each other, both the ram drive and the table drive are preferably servomotor drives. The servomotors work on the plunger or the table preferably via gears that have at least one rest position. A rest position is a position in which the reduction between servo motor and plunger or table in at least one point is very large or even infinite. This applies to eccentric gear as well as toggle mechanism in the extended position of the elements involved. Multi-unit transmissions with multiple stretched positions can be used to advantage.

Vorzugweise wird der Servomotor des Stößelantriebs im Umkehrbetrieb betrieben. Er stoppt in der Nähe des unteren Stößeltotpunkts und bringt damit den Exzenter und sein Pleuel in Strecklage. Um den Stößel nach erfolgter Umformung des Blechteils wieder in Gegenrichtung von dem unteren Totpunkt weg zu verfahren, d.h. das Werkzeug zu öffnen, kann der Servomotor, falls gewünscht, in Gegenrichtung gedreht werden, bis der Stößel den gewünschten Hub vollführt hat. Der von dem Exzenter durchlaufende Drehwinkel kann auf einen Wert < 180° Grad, oder vorzugsweise < 90° Grad beschränkt werden. Gleiches gilt für den Tischantrieb, bei dem der Drehwinkel sogar auf Werte < 60° Grad beschränkt werden kann.Preferably, the servomotor of the ram drive is operated in reverse operation. It stops near the bottom plunger dead point and thus brings the eccentric and its connecting rod in an extended position. In order to move the plunger again after the forming of the sheet metal part in the opposite direction from the bottom dead center, ie to open the tool, the servo motor, if desired, can be rotated in the opposite direction until the plunger has performed the desired stroke. The one of the eccentric continuous rotation angle can be limited to a value <180 degrees, or preferably <90 degrees. The same applies to the table drive, where the rotation angle can even be limited to values <60 ° degrees.

Weiter Einzelheiten vorteilhafter Ausführungsformen der Erfindung ergeben sich aus Ansprüchen, der Zeichnung oder der Beschreibung. Es zeigen:

  • Figur 1 eine erfindungsgemäße Ziehpresse in schematisierter Darstellung bei offenem Werkzeug,
  • Figur 2 die Presse nach Figur 1 zu Beginn eines Ziehvorgangs,
  • Figur 3 die Presse nach Figur 1 bei Abschluss eines Ziehvorgangs,
  • Figur 4 die Presse nach Figur 1 nach Durchführung eines Ziehvorgangs bei offenem Werkzeug,
  • Figur 5 eine abgewandelte Ausführungsform der erfindungsgemäßen Ziehpresse in schematisierter Darstellung,
  • Figur 6 ein abgewandelter Antrieb der als Stößelantrieb oder alternativ auch als Tischantrieb bei der erfindungsgemäßen Ziehpresse dienen kann,
  • Figur 7 eine Spanneinrichtung eines alternativen Ausführungsbeispiels der Ziehpresse in schematischer Darstellung,
  • Figur 8 eine schematische perspektivische Darstellung einer Blechhalter-Klemmfläche des Blechhalters der Ziehpresse und
  • Figur 9 eine schematische, blockschaltbildähnliche Darstellung eines weiteren Ausführungsbeispiels der Ziehpresse.
Further details of advantageous embodiments of the invention will become apparent from the claims, the drawings or the description. Show it:
  • FIG. 1 a drawing press according to the invention in a schematic representation with open tool,
  • FIG. 2 the press after FIG. 1 at the beginning of a drawing process,
  • FIG. 3 the press after FIG. 1 upon completion of a drawing operation,
  • FIG. 4 the press after FIG. 1 after performing a drawing operation with the tool open,
  • FIG. 5 a modified embodiment of the drawing press according to the invention in a schematic representation,
  • FIG. 6 a modified drive can serve as a ram drive or alternatively as a table drive in the drawing press according to the invention,
  • FIG. 7 a tensioning device of an alternative embodiment of the drawing press in a schematic representation,
  • FIG. 8 a schematic perspective view of a blank holder clamping surface of the sheet holder of the drawing press and
  • FIG. 9 a schematic, block diagram similar representation of another embodiment of the drawing press.

In Figur 1 ist eine Ziehpresse 10 veranschaulicht, die zur Herstellung von großen Blechteilen, beispielsweise Karosserieteilen, dienen kann. Zu der Ziehpresse 10 gehört ein Pressengestell 11, das mindestens einen, vorzugsweise mehrere, vorzugsweise vertikal orientierte Ständer 12, einen Kopf 13, der von den Ständern 12 getragen wird, und ein Sockel 14 gehören, der unter oder zwischen den Ständern 12 angeordnet ist. Der Kopf 13, die Ständer 12 und der Sockel 14 bilden einen geschlossenen Rahmen. In diesem ist ein Stößel 15 in einer z.B. vertikalen Bewegungsrichtung 16 verfahrbar gelagert. Zur Lagerung des Stößels 15 dienen z.B. an den Ständern 12 vorgesehene Linearführungen 17.In FIG. 1 a drawing press 10 is illustrated, which can be used for the production of large sheet metal parts, such as body parts. To the drawing press 10 includes a press frame 11, the at least one, preferably a plurality, preferably vertically oriented stand 12, a head 13, which is supported by the uprights 12, and a pedestal 14, which is arranged below or between the uprights 12. The head 13, the stand 12 and the base 14 form a closed frame. In this, a plunger 15 is movably mounted in an example vertical direction of movement 16. For the storage of the plunger 15 are provided for example on the uprights 12 provided linear guides 17th

Der Stößel 15 dient der Aufnahme eines oberen Werkzeugteils, das als Matrizenwerkzeug 18 ausgebildet ist. Es ist in Figur 1 im Schnitt dargestellt und weist einen Rand 19 auf, der zum Klemmen und Halten des Rands eines Werkstücks während des Ziehvorgangs dient. Das Werkstück wird durch eine Platine 20 d.h., ein zunächst ebenes Blech gebildet. Der Rand 19 umgibt einen Werkzeughohlraum 21, in den hinein das Werkstück zu verformen ist.The plunger 15 serves to receive an upper tool part, which is designed as a die tool 18. It is in FIG. 1 shown in section and has a rim 19, which serves for clamping and holding the edge of a workpiece during the drawing process. The workpiece is formed by a board 20 that is, an initially flat sheet. The rim 19 surrounds a tool cavity 21 into which the workpiece is to be deformed.

Zum Antrieb des Stößels 15 dient ein Stößelantrieb 22, der einen oder auch mehrere Servomotore 23, 24 umfasst, die über ein oder mehrere Getriebe 25, 26 mit dem Stößel 15 verbunden sind. Die beiden Getriebe 25, 26 sind im vorliegenden Ausführungsbeispiel zueinander spiegelsymmetrisch und jeweils als Exzentergetriebe aufgebaut. Sie umfassen jeweils einen Exzenter 27, 28, der über einen Pleuel 29, 30 mit dem Stößel 15 verbunden ist.To drive the plunger 15 is a ram drive 22 which comprises one or more servo motors 23, 24 which are connected via one or more gear 25, 26 with the plunger 15. The two gear 25, 26 are mirror-symmetrical to each other in the present embodiment and each constructed as an eccentric gear. They each include an eccentric 27, 28, which is connected via a connecting rod 29, 30 with the plunger 15.

Im Weiteren weist die Ziehpresse 10 einen Pressentisch 31 auf, auf dem ein Fahrtisch 32 angeordnet sein kann. Der Fahrtisch 32 dient in bekannter Weise dem Werkzeugwechsel. Der Fahrtisch 32 trägt den unteren Werkzeugteil, zu dem eine Werkzeugunterstützung 33, mit einem darauf angeordneten Stempelwerkzeug 34 und ein Blechhalter 35 gehören. Das Stempelwerkzeug 34 ist eine konvexe Matrize, deren obere Kontur dem Hohlraum 31 entspricht. Sie ist von dem in den meisten Fällen rechteckringförmigen Blechhalter 35 umgeben, wobei der Blechhalter 35 und das Stempelwerkzeug 34 bezüglich der Bewegungsrichtung 16 gegeneinander beweglich sind.Furthermore, the drawing press 10 has a press table 31, on which a travel table 32 can be arranged. The drive table 32 is used in a known manner the tool change. The drive table 32 carries the lower tool part, to which a tool support 33, with a punch tool 34 arranged thereon and a blank holder 35 belong. The punch tool 34 is a convex die whose upper contour corresponds to the cavity 31. It is surrounded by the rectangular-shaped sheet holder 35 in most cases, wherein the sheet holder 35 and the punch tool 34 are movable relative to each other with respect to the movement direction 16.

Die aus dem Stempelwerkzeug 34, der Werkzeugunterstützung 33, dem Fahrtisch 32 und dem Pressentisch 31 bestehende Einheit ruht auf einem Tischantrieb 36, der in Bewegungsrichtung 16 (siehe entsprechender Pfeil) in Richtung auf den Stößel 15 hin und von diesem weg bewegbar ist. Der Pressentisch 31, bzw. sein Tischantrieb 36, ist in dem Pressengestell an den Ständern 12 und/oder dem Sockel 14 mittels Führungseinrichtungen 37 linear in Bewegungsrichtung verfahrbar. Zu dem Tischantrieb 36 gehören ein oder mehrere Getriebe 38, 39, die, wie schon die Getriebe 25, 26, jeweils eine Blockierstellung aufweisen. Sie sind z.B. als Exzentergetriebe ausgebildet, die den Pressentisch 31 mit einem oder mehreren Servomotoren 40, 41 in Antriebsverbindung bringen. Die Getriebe 38, 39 umfassen jeweils einen Exzenter 42, 43, der über ein Pleuel 44, 45 mit dem Pressentisch 31 verbunden ist.The unit consisting of the punch tool 34, the tool support 33, the drive table 32 and the press table 31 rests on a table drive 36 which is movable in the direction of movement 16 (see corresponding arrow) in the direction of the plunger 15 and away from it. The press table 31, or its table drive 36, is linearly movable in the press frame on the uprights 12 and / or the base 14 by means of guide means 37 in the direction of movement. To the table drive 36 includes one or more gear 38, 39, which, like the transmission 25, 26, each having a blocking position. They are e.g. designed as an eccentric gear that bring the press table 31 with one or more servomotors 40, 41 in drive connection. The gear 38, 39 each comprise an eccentric 42, 43, which is connected via a connecting rod 44, 45 with the press table 31.

Der Blechhalter 35 stützt sich über geeignete Abstützelemente, beispielsweise in Gestalt von Druckbolzen 46, auf einem Widerlager 47 ab. Das Widerlager 47 kann im einfachsten Fall bezüglich des Sockels 14 ortsfest angeordnet sein. Alternativ kann es mit einem Verstellapparat 48 in Verbindung stehen, der die Position des Widerlagers 47, in Bezug auf die Bewegungsrichtung 16, z.B. justieren kann. Dies erfolgt üblicherweise im lastfreien Zustand. Der Verstellapparat 48 kann jedoch auch so ausgebildet sein, dass er das Widerlager 47 unter Last verstellen kann, beispielsweise um die auf den Blechhalter 35 und somit auf den Ziehrand des Werkstücks einwirkende Kraft gezielt zu beeinflussen oder zu regulieren. Der Verstellapparat 48 kann in Gestalt von Hydraulikzylindern, Kniehebelverstellerapparaten, Hubspindelverstellapparaten oder dergleichen ausgebildet sein. Zwischen dem Widerlager 47 und dem Tischantrieb 36 können in Bewegungsrichtung 16 orientierte Linearführungen 49 vorgesehen sein.The blank holder 35 is supported on suitable abutment elements, for example in the form of pressure pins 46, on an abutment 47. The abutment 47 may be arranged stationary in the simplest case with respect to the base 14. Alternatively, it may be associated with an adjustment device 48 which can adjust the position of the abutment 47 with respect to the direction of movement 16, for example. This is usually done in no-load condition. However, the adjustment 48 may also be designed so that it can adjust the abutment 47 under load, for example, to specifically influence or regulate the force acting on the blank holder 35 and thus on the drawing edge of the workpiece force. The adjusting apparatus 48 may be in the form of hydraulic cylinders, toggle adjusters, Hubspindelverstellapparaten or the like. Between the abutment 47 and the table drive 36 16 oriented linear guides 49 may be provided in the direction of movement.

Die in soweit beschriebene Ziehpresse 10 arbeitet wie folgt:

  • zunächst befindet sich die Ziehpresse 1 in Offenstellung. Dazu ist der Stößel 15 durch entsprechende Drehung der Exzenter 27, 28 in eine obere Position verfahren. Der Pressentisch 31 ist durch entsprechende Drehung der Exzenter 42, 43 in eine untere Position gefahren. Somit steht das Stempelwerkzeug 34 wenig oder nicht wenig über den Blechhalter 35 vor. Eine im Wesentlichen ebene Platine kann auf den Blechhalter 35 aufgelegt werden.
The drawing press 10 described so far operates as follows:
  • First, the drawing press 1 is in the open position. For this purpose, the plunger 15 is moved by appropriate rotation of the eccentric 27, 28 in an upper position. The press table 31 is driven by corresponding rotation of the eccentric 42, 43 in a lower position. Thus, the punch tool 34 protrudes little or not much above the sheet holder 35. A substantially planar board can be placed on the blank holder 35.

Sobald entsprechende hier nicht weiter dargestellte Werkstücktransportmittel, wie beispielsweise Feeder, Saugerspinnen oder sonstiger Greifer, aus dem Werkzeugraum raus gefahren sind, kann das Werkzeug schließen. Dazu wird die Ziehpresse 10 in die in Figur 2 veranschaulichte Position überführt. Die hier nicht weiter dargestellten Servomotoren 23, 24 haben dazu die Exzenter 27, 28 soweit gedreht, dass der Stößel 15 seinen unteren Totpunkt erreicht hat. Kurz vor Erreichen des unteren Totpunkts setzt der Rand 19 des Matrizenwerkzeug 18 auf dem Rand der Platine 20 auf und beginnt diese gegen den Blechhalter 35 zu pressen. Der Blechhalter 35 ruht über die Abstützelemente 46 unnachgiebig auf dem Widerlager 47, so dass nun das Pressengestell in Bewegungsrichtung 16 gespannt wird. Seine Federkonstante bestimmt im Zusammenspiel mit der eingestellten Position des Blechhalters 35 die auf den Rand der Platine 20 wirkende Einspannkraft sehr präzise. Ist die untere Totlage des Stößels 15 und somit die Spannstellung des Matrizenwerkzeugs 18 erreicht, sind die Servomotoren 23, 24 ganz oder zumindest fast lastfrei. Die Blechhaltekraft wird über die in Strecklage befindliche Pleuelexzenteranordnung des Getriebes 25 und 26 an dem Kopf 13 abgestützt. Für das Aufrechterhalten der auf den Rand der Platine 20 einwirkenden Haltekraft wird keine Energie verbraucht. Es findet dazu auch kein Energieaustausch zwischen Stößelantrieb und irgendeinem Ziehkissen statt.As soon as corresponding workpiece transport means, not shown here, such as feeder, suction spiders or other grippers, are driven out of the tool room, the tool can close. For this purpose, the drawing press 10 in the in FIG. 2 illustrated position transferred. The servomotors 23, 24 not shown here have the eccentric 27, 28 turned so far that the plunger 15 has reached its bottom dead center. Shortly before reaching the bottom dead center, the edge 19 of the die tool 18 sets on the edge of the board 20 and begins to press against the blank holder 35. The blank holder 35 rests on the support elements 46 relentless on the abutment 47, so that now the press frame is stretched in the direction of movement 16. Its spring constant determined in conjunction with the set position of the sheet holder 35, the force acting on the edge of the board 20 clamping force very precise. If the bottom dead center of the plunger 15 and thus the clamping position of the die tool 18 is reached, the servomotors 23, 24 are completely or at least almost free of load. The sheet-holding force is supported on the head 13 via the Pleuelexzenteranordnung located in the extended position of the transmission 25 and 26. No energy is consumed to maintain the holding force acting on the edge of the board 20. There is also no energy exchange between ram drive and any die cushion instead.

Ausgehend von diesem Zustand wird nun der eigentliche Ziehvorgang eingeleitet, dessen Ende in Figur 3 veranschaulicht ist. Zur Durchführung des Ziehvorgangs werden die Servomotoren 40, 41 angesteuert, so dass die Exzenter 42, 43 mit den Pleueln 44, 45 in Strecklage gehen, und somit den oberen Totpunkt des Tischantriebs 36 erreichen. In diesem ist das Stempelwerkzeug 34 ganz nach oben in das Matrizenwerkzeug 18 eingefahren. Beim Annähern an die Strecklage geht die Untersetzung zwischen den Servomotoren 41, 42 und dem Pressentisch 31 gegen unendlich, so dass das Stempelwerkzeug 34 sehr hohe Drücke auf das Werkstück aufbringen kann.Starting from this state, the actual drawing process is initiated, the end in FIG. 3 is illustrated. To carry out the drawing operation, the servomotors 40, 41 are activated, so that the eccentrics 42, 43 with the connecting rods 44, 45 go into an extended position, and thus reach the top dead center of the table drive 36. In this, the punch tool 34 is fully retracted into the die tool 18. When approaching the extended position, the reduction between the servomotors 41, 42 and the press table 31 approaches infinity, so that the punch tool 34 can apply very high pressures to the workpiece.

Im Weiteren wird das aus dem Matrizenwerkzeug 18 und den Stempelwerkzeug 34 bestehende Werkzeug wieder geöffnet, indem bei weiter ruhendem Blechhalter 35 der Stößel 15 nach oben und der Pressentisch 31 nach unten gefahren werden. Figur 4 veranschaulicht den Stößel 15 bereits in oberer Stellung, während das Stempelwerkzeug 34 noch in Arbeitsposition steht. Es wird noch durch entsprechende Drehung der Exzenter 42, 43 nach unten gefahren, wonach es nur noch auf dem Blechhalter 35 liegt, und durch einen Werkstücktransporteinrichtung, z.B. Saugerspinne oder dergleichen, aus der Ziehpresse 10 heraus gefahren werden kann.In addition, the tool consisting of the die tool 18 and the punch tool 34 is opened again by moving the plunger 15 upwards and the press table 31 downwards when the sheet holder 35 continues to rest. FIG. 4 already illustrates the plunger 15 in the upper position, while the punch tool 34 is still in working position. It will still driven by appropriate rotation of the eccentric 42, 43 down, after which it is only on the plate holder 35, and can be driven out of the drawing press 10 by a workpiece transport device, such as suction spider or the like.

Die insoweit beschriebene Ziehpresse 10 bietet ein Konzept, das sich zur Weiterverwendung von Ziehwerkzeugen eignet, die bisher in Pressen mit unten angeordneten Ziehkissen genutzt worden sind. Dazu weist der Pressentisch 31 eine Gruppe 50 von Öffnungen 51, 52, 53 auf, durch die die Abstützelemente 46 wahlweise hindurch gesteckt werden können. Insoweit können verschieden große Werkzeuge verwendet werden, deren Blechhalter 35 verschiedene Abstände überspannen. Insoweit ergibt sich eine geometrisch variable Krafteinleitung für den Blechhalter 35. Dies bietet zudem einen erhöhten Freiraum bzw. Komfort beim Werkzeugentwurf.The drawing press 10 so far described offers a concept which is suitable for the further use of drawing tools which have hitherto been used in presses with drawing cushions arranged at the bottom. For this purpose, the press table 31 has a group 50 of openings 51, 52, 53, through which the support elements 46 can optionally be inserted therethrough. In that regard, tools of different sizes can be used, whose blank holder 35 span different distances. In that regard, results in a geometrically variable force introduction for the blank holder 35. This also provides an increased space or comfort in tool design.

An dem vorgestellten Pressenkonzept sind unter Beibehaltung des Grundprinzips zahlreiche Abwandlungen möglich. Beispielsweise kann der Stößel 15 durch die Getriebe 25, 26 ziehend bewegt werden, wenn die Servomotoren 23, 24 an dem Sockel 14 angeordnet sind.Numerous modifications are possible on the presented press concept while maintaining the basic principle. For example, the plunger 15 can be moved by the gear 25, 26 pulling when the servomotors 23, 24 are arranged on the base 14.

Weiter kann der Antrieb des Pressentischs 31 bei dieser und auch bei allen anderen Ausführungsformen durch einen einzigen Servomotor 40 bewirkt werden, wenn die Zahnräder der Exzenter 42, 43 miteinander kämmen oder wenn die Exzenter 42, 43 auf andere Weise durch geeignete Getriebemittel untereinander verbunden sind. Außerdem können die Exzenter 42, 43 auf Segmenträder reduziert werden, so dass eine Verzahnung auf einen Teil des Umfangs beschränkt werden kann. Zur Kostensenkung kann diese Maßnahme auch bei den Exzentern 27, 28 bzw. deren Zahnrändern Anwendung finden.Further, the drive of the press table 31 can be effected in this and in all other embodiments by a single servo motor 40 when the gears of the eccentric 42, 43 mesh with each other or if the eccentric 42, 43 are connected in any other way by suitable transmission means. In addition, the eccentric 42, 43 can be reduced to segment wheels, so that a toothing can be limited to a part of the circumference. To reduce costs can This measure also in the eccentrics 27, 28 and their edges find application.

Außerdem zeigt Figur 6 eine Antriebseinrichtung, die wahlweise sowohl als Stößelantrieb 22 wie auch als Tischantrieb 36 Anwendung finden kann. Auch dieser Antrieb hat eine Ruhestellung, wenn seine Lenker 54, 55 in Strecklage sind. In dieser Strecklage bewirkt eine Drehung des antreibenden Servomotors 23, 24 (oder entsprechend 40, 41) keine oder nur eine äußerst geringe Linearverstellung des angeschlossenen Glieds, beispielsweise des Stößels 15. Auf diese einwirkenden Kräfte werden auf geradem Wege durch die Lenker 54, 55 an dem Pressengestell 11 abgestützt ohne die Servomotoren zu belasten.Also shows FIG. 6 a drive device which can be used either as a ram drive 22 as well as a table drive 36 application. Also, this drive has a rest position when its links 54, 55 are in an extended position. In this extended position causes a rotation of the driving servo motor 23, 24 (or corresponding to 40, 41) no or only an extremely low linear adjustment of the connected member, such as the plunger 15. These forces acting on straight paths by the links 54, 55 at the press frame 11 supported without burdening the servomotors.

Bei einer weiteren Ausgestaltungsvariante der Ziehpresse 10 gemäß Figur 7 ist eine Spanneinrichtung 60 vorhanden, die dazu dient, den Blechhalter 35 gegen den oberen Stößel 15 zu spannen. Die Spanneinrichtung 60 umfasst mehrere Spanneinheiten die vorzugsweise entlang des ringförmigen Blechhalters 35 verteilt sind.In a further embodiment variant of the drawing press 10 according to FIG. 7 a tensioning device 60 is provided which serves to clamp the sheet metal holder 35 against the upper plunger 15. The clamping device 60 comprises a plurality of clamping units which are preferably distributed along the annular plate holder 35.

Zu der Spanneinheit 60 gehört ein Zugelement in Form eines Spannbolzens 61, der am Stößel 15 gehalten und auf den Blechhalter 35 hin und von diesem weg, zumindest geringfügig, beweglich gelagert ist. Der von dem Spannbolzen 61 minimal zu durchlaufende Bewegungshub entspricht dem Hub, der nach dem Aufsetzen des Stößels 15 auf der Platine 20 zum Festpannen derselben erforderlich ist. Im Einzelfall kann dieser Hub sehr gering sein und wenige Millimeter oder Bruchteile von Millimetern betragen. Vorzugsweise ist der Hub jedoch wesentlich größer und zwar so groß, dass Spannbolzen 61 im wesentlichen vollständig in den Stößel 15 eingezogen werden kann.To the clamping unit 60 includes a tension member in the form of a clamping bolt 61, which is held on the plunger 15 and on the plate holder 35 and away, at least slightly, is movably mounted. The minimal to be traversed by the clamping bolt 61 movement stroke corresponds to the stroke, which is required after mounting of the plunger 15 on the board 20 for tightening the same. In individual cases, this stroke can be very small and amount to a few millimeters or fractions of a millimeter. Preferably, however, the stroke is much larger and indeed so large that clamping bolt 61 can be substantially completely retracted into the plunger 15.

Dem Spannbolzen 61 ist eine Krafterzeugungseinrichtung 62 zugeordnet, die hier beispielshalber in Form einer hydraulischen Antriebseinrichtung ausgebildet ist. Sie wird durch einen Hydraulikzylinder 63 mit zwei Arbeitskammern 64, 65 gebildet, die durch einen Kolben 66 voneinander getrennt sind. Der Spannbolzen 61 bildet beispielsgemäß die Kolbenstange des Kolbens 66. Dieser ist abgedichtet aus dem Hyd-raulikzylinder 63 herausgeführt.The clamping bolt 61 is associated with a force generating device 62, which is formed here for example in the form of a hydraulic drive device. It is formed by a hydraulic cylinder 63 with two working chambers 64, 65, which are separated from each other by a piston 66. The clamping bolt 61 forms, for example, the piston rod of the piston 66. This is sealed out of the Hyd-raulikzylinder 63 led out.

Der Spannbolzen 61 weist an seinem unteren Ende ein Verriegelungsmittel 67, beispielsgemäß eine Ausnehmung zum Beispiel in Form einer Verriegelungsnut 68 auf, die als Ringnut ausgebildet ist. Vorzugsweise ist die Verriegelungsnut 68 an der der Krafterzeugungseinrichtung 62 zugewandten Seite mit einer konischen Flanke und an der gegenüberliegenden Seite mit einer ebenen Flanke begrenzt.The clamping bolt 61 has at its lower end a locking means 67, for example according to a recess, for example in the form of a locking groove 68 which is formed as an annular groove. Preferably, the locking groove 68 is limited at the force-generating device 62 side facing a conical edge and on the opposite side with a flat edge.

Zu der Spanneinheit 60 gehört außerdem eine dem Spannbolzen 61 zugeordnete Verriegelungseinrichtung 69, die mindestens einen, vorzugsweise mehrere radial bewegliche Riegel 70, 71 aufweist. Diese werden durch einen hydraulischen oder anderweitigen Aktuator 72, z. B. in Form eines Ringkolbens betätigt, der koaxial zu einer den Spannbolzen 61 aufnehmenden Bohrung 73 in einer Ringkammer angeordnet ist. Er betätigt die Riegel 35, 36 über ein Keilgetriebe und kann somit die Riegel 35, 36 gezielt radial verstellen.To the clamping unit 60 also includes a clamping bolt 61 associated locking device 69, which has at least one, preferably a plurality of radially movable latch 70, 71. These are by a hydraulic or other actuator 72, z. B. actuated in the form of an annular piston which is arranged coaxially to a clamping bolt 61 receiving bore 73 in an annular chamber. He actuates the latch 35, 36 via a wedge gear and thus can selectively adjust the latch 35, 36 radially.

Der Spannbolzen 61 kann beim Öffnen und Schließen des Werkzeugs in die Bohrung 73 ein und aus dieser ausfahren. Er kann jedoch auch eine Länge besitzen, die so groß ist, dass er stets in der Bohrung 73 gleitet ohne aus dieser auszufahren. Es können auch Spanneinheiten mit langen und Spanneinheiten mit kurzen Bolzen gemischt vorgesehen werden, wobei Spanneinheiten mit kurzen Spannbolzen 61, die aus ihrer Bohrung 73 ausfahren, dort angeordnet sind, wo sie sonst dem Werkstück für dessen Transport im Wege wären.The clamping bolt 61 can extend when opening and closing the tool in the bore 73 and out of this. However, it can also have a length that is so large that it always slides in the bore 73 without extending out of this. It is also possible to provide clamping units with long and clamping units mixed with short bolts, with clamping units with short clamping pins 61, which extend from its bore 73, are arranged where they would otherwise the workpiece for its transport would be in the way.

In verriegeltem Zustand sorgt die Verriegelungseinrichtung 69 für eine kraft- und/oder formschlüssige Verbindung mit den Spannbolzen 61 des Stößels. Beispielsgemäß greifen die Riegel 69, 70 in die Verriegelungsnut 68 am zugeordneten Spannbolzen 61 ein. Über die Krafterzeugungseinrichtung 62 kann dann die Blechhaltekraft zwischen Blechhalter 35 und dem Stößel 15 energiesparend eingestellt werden.In the locked state, the locking device 69 provides a positive and / or positive connection with the clamping bolt 61 of the plunger. By way of example, the latches 69, 70 engage in the locking groove 68 on the associated clamping bolt 61. By means of the force-generating device 62, the sheet-holding force between sheet metal holder 35 and the plunger 15 can then be set to save energy.

Um bei hochfesten Blechen ein energiesparendes Klemmen der Platine 20 zu erreichen und ein versehentliches Einreißen der Platine 20 zu vermeiden, ist die dem Rand 19 zugewandte und zur Anlage an der Platine 20 vorgesehene Blechhalter-Klemmfläche 74 eben ausgestaltet (Figur 8). Das heißt, die Blechhalter-Klemmfläche 74 weist keine Vorsprünge oder Vertiefungen auf, insbesondere keine Klemmleisten, die zu einer entsprechenden lokalen Einformung in der Platine 20 beim Klemmen führen. Die Flächennormale N auf der Blechhalter-Klemmfläche 74 ist an jeder Stelle senkrecht zur zugeordneten Fläche der Platine 20 und zur Fläche des Randes 19 ausgerichtet.In order to achieve an energy-saving clamping of the board 20 in high-strength sheets and to avoid accidental tearing of the board 20, the edge 19 facing and provided for contact with the board 20 plate holder clamping surface 74 is configured just ( FIG. 8 ). That is, the blank holder clamping surface 74 has no projections or depressions, in particular no terminal strips, which lead to a corresponding local indentation in the board 20 during clamping. The surface normal N on the blank holder clamping surface 74 is aligned at any point perpendicular to the associated surface of the board 20 and the surface of the edge 19.

In dem in Figur 9 dargestellten Ausführungsbeispiel der Ziehpresse 10 ist der Stößelantrieb 22 von einem Füziehebelantrieb gebildet. Wenigstens einen der Hebel 75 des Kniehebelantriebs oder einem Kniehebelgelenk kann ein Stellungssensor 76 zugeordnet sein. Über den Stellungssensor 76 wird erfasst, ob die Kniehebelanordnung, zu der der Hebel 75 gehört, ihre Strecklage und damit ihre Blockierstellung eingenommen hat, die in Figur 9 veranschaulicht ist. Der Stellungssensor 76 ist mit einer Steuereinheit 77 verbunden, um dieser das Stellungssensorsignal S zu übermitteln.In the in FIG. 9 illustrated embodiment of the drawing press 10, the plunger drive 22 is formed by a Füziehebelantrieb. At least one of the lever 75 of the toggle drive or a toggle joint, a position sensor 76 may be assigned. Via the position sensor 76, it is detected whether the toggle lever arrangement, to which the lever 75 belongs, has assumed its extended position and thus its blocking position, which is illustrated in FIG. The position sensor 76 is provided with a Control unit 77 connected to this the position sensor signal S to transmit.

Der Stellungssensor 76 kann gleichzeitig aus als Anschlag und/oder Dämpfungselement für den Hebel 75 dienen oder einen Anschlag 76a und/oder ein Dämpfungselement 76a aufweisen. Dadurch kann die Blockierstellung exakt vorgerben werden.The position sensor 76 may simultaneously serve as a stop and / or damping element for the lever 75 or have a stop 76a and / or a damping element 76a. As a result, the blocking position can be exactly pre-tanned.

Der Stößelantrieb 22 arbeitet bei dieser Ausführungsform vorzugsweise in pendelnden Betrieb, wobei der Servomotor oder die Servomotoren des Stößelantriebs 22 ihre Drehrichtung an der oberen und unteren Endstellung des Stößels 15 jeweils umkehren.The ram drive 22 operates in this embodiment, preferably in oscillating operation, wherein the servo motor or the servomotors of the plunger drive 22 reverse their direction of rotation at the upper and lower end position of the plunger 15 respectively.

In Abwandlung zu dem in Figur 9 gezeigten Ausführungsbeispiel könnte der Stößelantrieb 22 auch als Exzenterantrieb ausgeführt sein, wie dies in den vorherigen Ausführungsbeispielen gezeigt ist.In modification to the in FIG. 9 As shown, the ram drive 22 could also be designed as an eccentric drive, as shown in the previous embodiments.

Dem Matrizenwerkzeug 18 kann optional ein Permeabilitätssensor 78 zugeordnet, der ein Zugspannungssignal Z erzeugt und an die Steuereinheit 77 übermittelt. Das Zugspannungssignal Z beschreibt die auf die Platine 20 einwirkende Zugspannung beim Umformen. Hierfür erfasst der Permeabilitätssensor 78 die sich aufgrund der Zugspannung ändernde Permeabilität der Platine 20. Das Zugspannungssignal z kann zur Optimierung der Blechhaltekraft des Blechhalters 35 und/oder der Umformkraft zwischen dem Stempelwerkzeug 34 und der Platine 20 verwendet werden.The matrix tool 18 can optionally be assigned a permeability sensor 78 which generates a tension signal Z and transmits it to the control unit 77. The tension signal Z describes the tension acting on the board 20 during forming. For this purpose, the permeability sensor 78 detects the permeability of the circuit board 20 that changes due to the tensile stress. The tensile signal z can be used to optimize the sheet holding force of the sheet holder 35 and / or the forming force between the punch tool 34 and the circuit board 20.

Beim Ausführungsbeispiel nach Figur 9 ist der Tischantrieb 36 durch eine oder mehrere Spindelantriebe 79 gebildet. Jeder Spindelantrieb 79 weist eine Spindel 80, eine Spindelmutter 81 sowie einen beispielsgemäß die Spindelmutter 81 antreibenden Elektromotor 82 auf. In Abwandlung hierzu könnte der Elektromotor 82 auch die Spindel 80 antreiben. Anders als in der schematischen Darstellung nach Figur 9 ist der Elektromotor 82 vorzugsweise als Hohlwellenmotor mit innenliegendem Rotor ausgeführt, der das angetriebene Bauteil, also die Spindel 80 oder die Spindelmutter 81 koaxial umschließt. Solche Spindelmotoren 79 sind beispielsgemäß auch als Verstellapparat 48 zur Einstellung der Blechhaltekraft des Blechhalters 35 vorgesehen.According to the embodiment FIG. 9 the table drive 36 is formed by one or more spindle drives 79. Each spindle drive 79 has a spindle 80, a spindle nut 81 and an example according to the spindle nut 81 driving electric motor 82. In a modification to this, the electric motor 82 could also drive the spindle 80. Unlike in the schematic representation after FIG. 9 the electric motor 82 is preferably designed as a hollow shaft motor with an internal rotor, which coaxially surrounds the driven component, ie the spindle 80 or the spindle nut 81. Such spindle motors 79 are, for example, also provided as an adjusting device 48 for adjusting the plate-holding force of the plate holder 35.

Die Spindelantriebe 79, bzw. die Elektromotoren 82 der Spindelantriebe 79, werden durch die Steuereinheit 77 angesteuert.The spindle drives 79, or the electric motors 82 of the spindle drives 79, are controlled by the control unit 77.

Die Übersetzung zwischen der Spindelmutter 81 und der Spindel 80 kann insbesondere beim Verstellapparat 48 so gewählt, dass eine Selbsthemmung im Spindelgetriebe auftritt. In diesem Fall muss der zugeordnete Elektromotor 82 nur dann betrieben werden, wenn die Blechhaltekraft verändert oder nachgeregelt werden muss. Zum Aufrechterhalten einer eingestellten Blechhaltekraft muss der Elektromotor nicht bestromt werden.The translation between the spindle nut 81 and the spindle 80 can be chosen in particular in the adjusting device 48 so that a self-locking occurs in the spindle gear. In this case, the associated electric motor 82 only has to be operated if the plate holding force has to be changed or readjusted. To maintain a set plate holding force of the electric motor must not be energized.

Die Steuereinheit 77 steuert auch den Stößelantrieb 22 und bei dem hier dargestellten Ausführungsbeispiel eine Blockiereinrichtung 83. Die Blockiereinrichtung 83 ist zwischen dem Pressengestell 11, beispielsweise dem Kopf 13, und dem Stößel 15 angeordnet. Unabhängig davon, ob der Stößelantrieb 22 sich exakt in seiner Blockierstellung befindet oder nicht, kann über Blockiereinrichtung 83 eine Steife Verbindung zwischen dem Stößel 15 und dem Pressengestell 11 hergestellt werden. Diese steife Kopplung verhindert eine Bewegung des Stößels 15 in Bewegungsrichtung 16 aufgrund der auf den Stößel 15 einwirkenden Kräfte durch den Blechhalter 35 oder das Stempelwerkzeug 34.The control unit 77 also controls the ram drive 22 and in the embodiment shown here, a blocking device 83. The blocking device 83 is disposed between the press frame 11, for example, the head 13, and the plunger 15. Regardless of whether the plunger drive 22 is exactly in its blocking position or not, a rigid connection between the plunger 15 and the press frame 11 can be made via blocking device 83. This rigid coupling prevents movement of the plunger 15 in the direction of movement 16 due to the forces acting on the plunger 15 forces by the blank holder 35 or the punch tool 34th

Über die Steuereinheit 77 kann die Blockiereinrichtung 83 zwischen einer Kopplungsstellung K (durchgezogene Linien in Figur 9) und eine Freigabestellung F (gepunktete Linien in Figur 9) umgeschaltet werden. Hierfür weist die Blockiereinrichtung 83 quer zur Bewegungsrichtung 16 verschiebbare Blockierelemente 84 auf, die in ihrer Kopplungsstellung K mit Gegenelementen 85 am Stößel 15 zusammenwirken. In der Kopplungsstellung K fluchten die Blockierelemente 84 mit ihrem jeweils zugeordneten Gegenelement 85 in Bewegungsrichtung 16 und liegen an zugeordneten Stirnflächen 86 an-einander an. Über die Gegenelemente 85 und die Blockierelemente 84 stützt sich der Stößel 15 daher am Pressengestell 11 und beispielsgemäß am Kopf 13 ab. In der Kopplungsstellung K ist somit eine sehr steife Kopplung während des Umformvorgangs der Platine 20 zwischen dem Stößel 15 und dem Pressengestell 11 gewährleistet. Über den Stößelantrieb 22 muss keine Gegenhaltekraft erzeugt werden, was die Energieeffizienz der Ziehpresse 10 verbessert.About the control unit 77, the blocking device 83 between a coupling position K (solid lines in FIG. 9 ) and a release position F (dotted lines in FIG. 9 ) are switched. For this purpose, the blocking device 83 transversely to the direction of movement 16 slidable blocking elements 84, which cooperate in their coupling position K with counter-elements 85 on the plunger 15. In the coupling position K, the blocking elements 84 are aligned with their respective associated counter element 85 in the direction of movement 16 and abut against each other at associated end faces 86. On the counter elements 85 and the blocking elements 84, the plunger 15 is therefore supported on the press frame 11 and, according to the example, on the head 13. In the coupling position K thus a very rigid coupling during the forming process of the board 20 between the plunger 15 and the press frame 11 is ensured. About the ram drive 22 no holding force must be generated, which improves the energy efficiency of the drawing press 10.

In der Freigabestellung F befinden sich die Blockierelemente 84 quer zur Bewegungsrichtung 16 versetzt zu den Gegenelementen 85, so dass durch den Stößelantrieb 22 der Stößel 15 von seiner unteren Endlage in Bewegungsrichtung 16 nach oben bewegt werden kann.In the release position F, the blocking elements 84 are offset transversely to the direction of movement 16 to the counter-elements 85, so that by the plunger drive 22 of the plunger 15 can be moved from its lower end position in the direction of movement 16 upwards.

Zum Bewegen der Blockierelemente 84 zwischen der Kopplungsstellung K und der Freigabestellung F weist die Blockiereinrichtung 83 einen Linearantrieb 87 auf, der durch die Steuereinheit 77 angesteuert wird. Als Linearantrieb 87 kann beispielsweise ein Spindelantrieb dienen, der von einem Elektromotor angesteuert wird. Auch andere lineare Antriebe können verwendet werden.For moving the blocking elements 84 between the coupling position K and the release position F, the blocking device 83 has a linear drive 87, which is controlled by the control unit 77. As a linear drive 87 can serve, for example, a spindle drive, by an electric motor is controlled. Other linear drives can also be used.

In Abwandlung zu der Darstellung in Figur 9 können die verschiebbaren Blockierelemente 84 auch am Stößel 15 angeordnet sein. Dann sind die Gegenelemente 85 am Pressengestell 11 und vorzugsweise am Kopf 13 angeordnet.In modification to the presentation in FIG. 9 The displaceable blocking elements 84 can also be arranged on the plunger 15. Then the counter-elements 85 are arranged on the press frame 11 and preferably on the head 13.

Es ist auch möglich, bei den vorhergehend beschriebenen Aus führungsformen den Blechhalter 35 starr am Pressengestell 11 zu befestigen. Der Verstellapparat 48 kann dann einem am Stößel 15 vorhandenen Randteil zugeordnet sein, das mit dem Blechhalter 35 zum Festklemmen der Platine zusammenwirkt und in Bewegungsrichtung 16 durch den Verstellapparat 48 bewegbar ist.It is also possible in the previously described embodiments from the sheet holder 35 rigidly attached to the press frame 11. The adjusting device 48 may then be assigned to an existing on the plunger 15 edge part, which cooperates with the plate holder 35 for clamping the board and is movable in the direction of movement 16 by the adjusting device 48.

Die erfindungsgemäße Ziehpresse 10 weist ein Widerlager 47 zur Abstützung eines ruhenden Blechhalters 35 auf, der Teil eines Werkzeugs ist und über das Widerlager 47 an dem Pressengestell 11 abgestützt werden kann. Dem Blechhalter 35 ist ein Stößel 15 mit einem Matrizenwerkzeug 18 zugeordnet, wobei der Stößel 15 über einen Stößelantrieb mit Blockierstellung bewegt wird. Die Blockierstellung wird beispielsweise durch ein Getriebe 22 erreicht, dass in Blockierstellung keine Bewegung vom Getriebeausgang auf den antreibenden Servomotor 23 und/oder 24 überträgt. Beispielsweise wird dies durch ein Exzentergetriebe 25, 26 erreicht, wenn dies in Strecklage steht. Zur Durchführung des eigentlichen Ziehhubs ist das Stempelwerkzeug 34 vertikal beweglich gelagert. Der im zugeordnete Fahrtisch 32 wird von dem Pressentisch 31 über einen Tischantrieb 36 angehoben oder abgesenkt. Als Tischantrieb 36 dient vorzugsweise wiederum ein Servomotorantrieb mit einem nicht linearen Getriebe, beispielsweise einem Exzentergetriebe.The drawing press 10 according to the invention has an abutment 47 for supporting a stationary plate holder 35, which is part of a tool and can be supported on the press frame 11 via the abutment 47. The blank holder 35 is associated with a tappet 15 with a die tool 18, wherein the plunger 15 is moved via a ram drive with blocking position. The blocking position is achieved for example by a gear 22 that transmits in the blocking position no movement from the transmission output to the driving servomotor 23 and / or 24. For example, this is achieved by an eccentric gear 25, 26, when this is in an extended position. To carry out the actual pulling stroke the punch tool 34 is mounted vertically movable. The associated in the drive table 32 is raised or lowered by the press table 31 via a table drive 36. The table drive 36 is preferably again a servomotor drive with a non-linear gear, for example an eccentric gear.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

1010
Ziehpressedrawing press
1111
Pressengestellpress frame
1212
Ständerstand
1313
Knopfstud
1414
Sockelbase
1515
Stösseltappet
1616
Bewegungsrichtungmovement direction
1717
Linearführunglinear guide
1818
Matrizenwerkzeugdie tool
1919
Randedge
2020
Platinecircuit board
2121
Holraumhollow space
2222
Stösselantriebram drive
23, 2423, 24
Servomotorservomotor
25, 2625, 26
Getriebetransmission
27, 2827, 28
Exzentereccentric
29, 3029, 30
Pleuelpleuel
3131
Pressentischpress table
3232
Fahrtischtraveling table
3333
WerkzeuggrundplatteTool base
3434
Stempelwerkzeugstamp tool
3535
Blechhalterblankholder
3636
Tischantriebtable drive
3737
Linearführunglinear guide
38, 3938, 39
Getriebetransmission
40, 4140, 41
Servomotorservomotor
42, 4342, 43
Exzentereccentric
44, 4544, 45
Pleuelpleuel
4646
Abstützelementesupport elements
4747
Widerlagerabutment
4848
Verstellapparatadjustment device
4949
Linearführunglinear guide
5050
Gruppegroup
51-5351-53
Öffnungenopenings
54, 5554, 55
Lenkerhandlebars
6060
Spanneinrichtungtensioning device
6161
Spannbolzenclamping bolt
6262
KrafterzeuguugseinrichtungKrafterzeuguugseinrichtung
6363
Hydraulikzylinderhydraulic cylinders
64, 6564, 65
Arbeitskämmernworking combers
6666
Kolbenpiston
6767
Verriegelungsmittellocking means
6868
Verriegelungsnutlocking
6969
Verriegelungseinrichtunglocking device
70, 7170, 71
Riegelbars
7272
Aktuatoractuator
7373
Bohrungdrilling
7474
Blechhalter-KlemmflächeBlankholder-clamping surface
7575
Hebellever
7676
Stellungssensorposition sensor
76a76a
Anschlag und/oder DämpfungselementStop and / or damping element
7777
Steuereinheitcontrol unit
7878
Permeabilitätssensorpermeability sensor
7979
Spindelantriebspindle drive
8080
Spindelspindle
8181
Spindelmutterspindle nut
8282
Elektromotorelectric motor
8383
Blockiereinrichtungblocking device
8484
Blockierelementblocking element
8585
Gegenelementcounter-element
8686
Stirnflächeface
FF
Freigabestellungrelease position
KK
Kopplungsstellungcoupling position
NN
Flächennormalesurface normal
SS
StellungssensorsignalPosition sensor signal
ZZ
zugspannungssignaltensile stress

Claims (14)

  1. Drawing press (10)
    with a press frame (11),
    with a press slide (15) which is mounted in the press frame (11) by means of a slide drive (22) so as to be movable in a movement direction (16),
    wherein the slide drive (22) has a gear mechanism (25) with at least one blocking position in which no movement is transmitted from its gear output to a servomotor (23, 24) connected to its gear input,
    with a counter bearing (47) which is configured to support a blank holder (35),
    with a table (31) on which a punch tool (34) is held,
    with a table drive (36) which is connected to the table (31) in order to move this in the movement direction (16),
    wherein the table drive (36) is configured to execute the drawing stroke of the table (31) and of the punch tool (34) necessary for forming the blank, while the slide drive (22) is in the blocking position.
  2. Drawing press according to claim 1, characterised in that the table (31) comprises a group (50) of passage openings (51, 52, 53), and that supporting elements (46) are provided which extend through at least some of the passage openings (51) and via which the blank holder (35) is supported on the counter bearing (47).
  3. Drawing press according to claim 1, characterised in that the counter bearing (47) is arranged stationarily on the press frame (11).
  4. Drawing press according to claim 1, characterised in that the counter bearing (47) and the press slide (15) are arranged sprung relative to each other.
  5. Drawing press according to claim 1, characterised in that an adjustment drive (48) is assigned to the counter bearing (47) for regulating the blank holding force.
  6. Drawing press according to claim 5, characterised in that the adjustment drive (48) comprises at least one spindle drive (79).
  7. Drawing press according to claim 1, characterised in that the gear mechanism (25, 38) is an eccentric mechanism.
  8. Drawing press according to claim 1, characterised in that the gear mechanism (25, 38) is a toggle mechanism.
  9. Drawing press according to claim 1, characterised in that the slide drive (22) and/or the table drive (36) each comprise at least one servomotor (23, 24, 40, 41) or electric motor (82) which is operated in reversing mode.
  10. Drawing press according to claim 9, characterised in that the table drive (36) contains an eccentric mechanism, the eccentric (42) of which passes through a rotation angle of less than 90° on a press stroke.
  11. Drawing press according to claim 9, characterised in that the table drive (36) and/or the slide drive (22) comprise at least one spindle drive (79).
  12. Drawing press according to claim 11 and/or claim 6, characterised in that the table drive (36) and/or the slide drive (22) and/or the adjustment drive (48) are actuated separately via a control device (77).
  13. Drawing press according to claim 1, characterised in that a clamping device (60) is present which can create a connection between the press slide (15) and the blank holder (35).
  14. Method for deep-drawing a blank with a drawing press (10) which comprises a press slide (15) driven by a slide drive (22) for receiving a die tool (18), and a driven table (31) for receiving a punch tool (34),
    wherein the slide drive (22) comprises a gear mechanism (25) with at least one blocking position in which no movement is transmitted from its gear output to a servomotor (23, 24) connected to its gear input,
    wherein the press slide (15) and the table (31) can be moved in controlled fashion towards each other and away from each other,
    wherein the press slide (15) has only the reduced task of opening and closing the tool (18, 34) and fixedly clamping the drawn edge of the workpiece (20),
    and wherein the table (31) performs the drawing stroke by moving the punch tool (34) with the press slide (15) at rest and the blank holder (35) at rest, while the slide drive (22) is in the blocking position.
EP11743835.8A 2010-08-16 2011-08-15 Drawing press with a static blank holder Active EP2603334B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010034518 2010-08-16
DE201010037950 DE102010037950B4 (en) 2010-10-04 2010-10-04 Drawing press with static sheet metal holding
PCT/EP2011/064043 WO2012022720A1 (en) 2010-08-15 2011-08-15 Drawing press with a static blank holder

Publications (2)

Publication Number Publication Date
EP2603334A1 EP2603334A1 (en) 2013-06-19
EP2603334B1 true EP2603334B1 (en) 2018-04-25

Family

ID=44630303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11743835.8A Active EP2603334B1 (en) 2010-08-16 2011-08-15 Drawing press with a static blank holder

Country Status (7)

Country Link
US (1) US10160023B2 (en)
EP (1) EP2603334B1 (en)
JP (1) JP2014501617A (en)
BR (1) BR112013003446A2 (en)
ES (1) ES2670848T3 (en)
MX (1) MX358381B (en)
WO (1) WO2012022720A1 (en)

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CN103433343A (en) * 2013-08-19 2013-12-11 苏州市胜能弹簧五金制品有限公司 Linear punching device suitable for punching thin die plate
DE102013114693A1 (en) * 2013-12-20 2015-06-25 Fette Engineering GmbH Stuffing stamp station and method of filling capsules in a stuffing stamp station
US9931684B2 (en) 2014-04-18 2018-04-03 Honda Motor Co., Ltd. Forming die and method of using the same
DE102014115240B4 (en) * 2014-10-20 2017-08-24 Schuler Pressen Gmbh Press drive device for a press and press with press drive device
US10105742B2 (en) 2014-12-09 2018-10-23 Honda Motor Co., Ltd. Draw press die assembly and method of using the same
DE102018201629B4 (en) * 2018-02-02 2023-10-19 Volkswagen Aktiengesellschaft Adjusting device for adjusting the surface pressure in a sheet metal forming tool and sheet metal forming tool with at least one such adjusting device

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GB512631A (en) * 1938-03-09 1939-09-21 Rudolph William Glasner Improvements in or relating to metal working presses
JPS60159000A (en) * 1984-01-30 1985-08-20 Amada Co Ltd Method for controlling drawing with mechanical press
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Also Published As

Publication number Publication date
US10160023B2 (en) 2018-12-25
US20130180301A1 (en) 2013-07-18
BR112013003446A2 (en) 2021-05-25
EP2603334A1 (en) 2013-06-19
WO2012022720A1 (en) 2012-02-23
MX358381B (en) 2018-08-15
US20180264536A9 (en) 2018-09-20
MX2013001896A (en) 2013-08-01
ES2670848T3 (en) 2018-06-01
JP2014501617A (en) 2014-01-23

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