EP1184102A2 - Outil flexible pour déformation d'une pièce - Google Patents

Outil flexible pour déformation d'une pièce Download PDF

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Publication number
EP1184102A2
EP1184102A2 EP01120668A EP01120668A EP1184102A2 EP 1184102 A2 EP1184102 A2 EP 1184102A2 EP 01120668 A EP01120668 A EP 01120668A EP 01120668 A EP01120668 A EP 01120668A EP 1184102 A2 EP1184102 A2 EP 1184102A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
tool
pressure
fluid
contact surface
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.)
Withdrawn
Application number
EP01120668A
Other languages
German (de)
English (en)
Other versions
EP1184102A3 (fr
Inventor
Fritz Michael Streuber
Axel Tackenberg
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.)
Esc & Cokg Extended Structured Composites GmbH
Original Assignee
Esc & Cokg Extended Structured Composites GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esc & Cokg Extended Structured Composites GmbH filed Critical Esc & Cokg Extended Structured Composites GmbH
Publication of EP1184102A2 publication Critical patent/EP1184102A2/fr
Publication of EP1184102A3 publication Critical patent/EP1184102A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B21D26/027—Means for controlling fluid parameters, e.g. pressure or temperature
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/12—Stamping using yieldable or resilient pads using enclosed flexible chambers
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B21D26/031—Mould construction
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/02—Die constructions enabling assembly of the die parts in different ways

Definitions

  • the invention relates to the forming of workpieces with the aid of a flexible tool.
  • Forming sheet metal tubes 12-1991, pp 33-37, is a forming device for Thermoforming known with a flexible thermoforming stamp.
  • the tool consists of a Matrix of several individually adjustable bar elements, which together form the shape of the Form thermoformed stamp.
  • the setting of the bar elements takes place outside of Forming device in an adjusting device.
  • the stamp is on the desired one Final shape set and for forming workpieces back into the Forming device installed.
  • DE 44 17 460 A1 proposes the flexible stamp to be used as a flexible die for forming with a printing medium. In the Forming first creates a free forming zone and the workpiece is placed attaches to the die in the course of the forming process. By a suitable, not closer specified movement of the die should have a positive influence on the forming process become.
  • a flexible draw die is known from WO 96/17697 for stretch drawing.
  • the Stamp is formed by a variety of stamp elements that form a matrix are summarized.
  • the final shape of the stamp is adjusted by the Stamp elements formed in the stretching device.
  • An object of the invention is to complex even by reshaping a workpiece To be able to produce workpiece shapes precisely.
  • the invention relates to the forming of workpieces by pressing or applying to a shape and / or pressing a shape against the workpiece.
  • a die forms the shape.
  • the forming force is released from the mold by extending the mold against the workpiece applied, such as during stretch drawing, a stamp forms the shape.
  • tool is used in the following, this term is intended to be used both a die and a stamp can be included.
  • the workpiece is preferably one before forming flat, preferably flat workpiece, for example a thin plate, a sheet or a similar semi-finished product.
  • the tool forms a contact surface for the workpiece. It has a frame and at least two shaped elements, each part of the Form contact surface. At least one shaped element which is at least two shaped elements axially movable relative to the other shaped element of the at least two shaped elements stored in the frame, so that the contact surface formed by the shaped elements can be changed.
  • the tool is a flexible tool.
  • "Axial" in the sense of the invention is any direction related to a workpiece underside facing the vertical Directional component has.
  • the shaped element can preferably be moved in a straight line stored.
  • the form elements of a die according to the invention are also described below Called matrix elements. Accordingly, the form elements are one Stamp according to the invention also referred to below as stamp elements.
  • the axially movable die element is axially flexible.
  • the matrix element is under the action of a on the contact surface of the Actuate force acting axially against a resistance force and is in resiliently stored in this sense.
  • the at least one movable Matrix element is preferably a plain bearing.
  • the workpiece can during the entire forming process or at least during part of the Forming process permanently against such a gradually yielding die element pressed and reshaped to the desired final shape in a permanent system. This enables the material flow in the workpiece to be precisely controlled. Also three-dimensional curved shapes can be produced more precisely. Deep drawing, a particularly preferred forming process, or a depth can be in several Levels.
  • the movable die elements or at least a movable die element continuously during the entire forming process be moved.
  • the workpiece is used throughout Forming process fully supported. Tears in the formed workpiece avoided more safely.
  • the resistance force in the case of a die is preferably a fluid damping force.
  • the Damping force can be achieved by displacing an incompressible fluid, i.e. one Hydraulic fluid, or a compressible fluid, such as air, is generated become.
  • a spring force can also use the resistance alone or in combination with form a damping force.
  • the resistance is solely by a displacing hydraulic fluid generated. Basically, the yielding can also only against mechanical frictional resistance.
  • a motorized process with motorized travel speed as a Giving in, although this is not preferred.
  • Matrix preferably have a plurality of matrix elements, which as in the known stamps are combined into a matrix, but each individually in the Die frame against one resistance or one for all or several of the Matrix elements of the same resistance are resiliently mounted.
  • the Resistance is preferably individual for each of the die elements variable.
  • the workpiece can be pressed against the die using a stamp.
  • the forming is preferably carried out using a pressure fluid, particularly preferred by a pressurized hydraulic fluid, with which one of the dies facing away from the top of the workpiece.
  • the die according to the invention can also be more flexible Stamps are used to advance the workpiece, especially through Stretch forming.
  • the matrix elements become stamp elements.
  • the die elements with the workpiece clamped over them are actively individual extended to the final shape of the stamp formed and the workpiece pre-stretched. After the stretching is finished, the workpiece is loaded the top of the workpiece is reshaped with a compressive force, for which the stamp elements Flexibility can be switched and again according to the invention, up to the Completely compliant die is formed.
  • the tool is a flexible stamp that is relative to each other has axially movable stamp elements during the shaping, so this becomes axial movable stamp element according to the invention by applying fluid pressure extended.
  • a preferably hydraulically operated extension, but also in principle a pneumatically operated extension points towards a mechanical or electric drive on the advantage that larger forming forces can be achieved and the Driving force can be applied directly to the respective stamp element and not only via mechanical transmission elements, such as gears and Couplings.
  • the flexible tool forms a stamp, it is preferably around a stamp for hydroforming, in which a back pressure is generated hydraulically by means of a membrane or without a membrane.
  • Form elements arranged on the edges of the tool can function as a Clamping device, i.e. the function of the hold-down devices usually used, take over and fix the workpiece. This can be achieved by using these form elements are worked with a correspondingly high resistance. There is no need for a separate clamping device.
  • the local Surface pressure that the workpiece experiences on the individual shaped elements can due to the invention advantageously but not only at the edges of the Tool, but over the entire contact surface of the tool for targeted Control of the material flow in the workpiece can be used by the Resistance in each of the die elements or the driving force in each of the Stamp elements specified individually or in groups of different sizes or can be changed individually or in groups.
  • the tool according to the invention can be simple in terms of its final shape Tool, i.e. the final shape of the tool is not in this case variable.
  • the tool in this embodiment is flexible only with respect to its compliance from an initial form to the non-variable final form. They don't
  • a variable final shape can be obtained by axially opening the shaped elements Block are driven, for example, by forming the shaped elements in different lengths or by inserting different thicknesses Between pieces.
  • the final shape of the tool i.e. the final form of plant surface formed by the tool
  • changeable to different shaped parts To be able to create shape.
  • the tool according to the invention is in this sense doubly flexible, namely on the one hand through the resilience to a final shape and on the other hand through the changeability of this final form.
  • the final shape of the tool i.e. the end position of the feature or the end positions of the several According to the invention movable elements during the forming can advantageously be changed in the forming device.
  • the axial position of preferably each individual shaped element via a position measuring system, for example capacitive, magnetic or opto-electronic, determined and with a control a predetermined, individual stopping point for each individual form element compared.
  • a form element has reached its predetermined breakpoint, this will be Form element fixed by an actuator from the control.
  • the toughness or the driving force is a fluid pressure force
  • the actuator can be controlled by a Valve are formed. It is basically sufficient here that the controllable valve from Flow on locks and vice versa can be controlled.
  • the controllable valve can be a flow control valve or it can be in addition to one Shut-off valve, a flow control valve can be provided to the fluid damping force to be able to change.
  • Fixing the at least one movable form element is used in such designs Invention preferably effected by means of a clamping sleeve, through which the Form element is passed.
  • each of the axially movable Shape elements individually by means of at least one shape element in question surrounding ferrule in a desired position with respect to the Direction of movement of the relevant element is fixed.
  • the Clamping sleeve has a radially flexible and preferably in the axial direction stable sleeve jacket, which is pressed against the molded element by force.
  • the sleeve shell is covered with an outer surface Hydraulic fluid pressurized and thereby pressed against the shaped element.
  • the radial compliance is preferably due to axial weaknesses in the Sleeve casing reached.
  • the size of the resistive force in the case of a die and the driving force in the case a stamp is preferably changeable to the travel speed of the Being able to change form elements, for example depending on the Workpieces to be formed and / or depending on the degree of deformation.
  • the resistance against which the form elements of a die give in during yielding retracted and the driving force by which the shaped elements of a stamp extended, can be the same size for all form elements.
  • the workpiece is constantly reshaped to the at least one or extending form element or preferably the several yielding or extending form elements created and is in this way by flat Support deformed in a controlled manner.
  • the resistance force is a fluid damping force
  • one can particularly simple forming device can be obtained in that the movable Matrix elements during forming into a joint filled with fluid Pressure vessel are driven in and the fluid while generating the Suppress damping force against flow resistance.
  • the Flow resistance can easily be created by forming a fluid outlet a specific flow cross-section, orifice or simple throttle or more preferably be adjusted by a controllable flow control valve.
  • a separate one for each movable die element Damping fluid filled cylinder provided, the damping force as described above is generated individually for each of these cylinders.
  • each of the connecting lines is between the individual cylinders and the fluid container with a shut-off valve or a shut-off control valve or with one shut-off valve and one Control valve equipped.
  • a variant is the equipment of each of the Connection lines only with one control valve each, while for all cylinders together a shut-off valve at, for example, an outlet of the as a pressure container trained fluid container would be arranged.
  • heads of the shaped elements with which the Press the form elements against the workpiece, tangential to the formed one Contact surface connected elastically is preferably through an elastic or semi-elastic membrane is formed with which the heads of the Form elements are connected to each other in such a way that the workpiece at Forming always a very uniform, constantly bulging in all directions Investment area is offered.
  • the uniformity of the elastic contact surface can also can be improved in that the contact surface between the through the shaped elements formed support points directed against the workpiece with a fluid pressure force, preferably a hydraulic fluid pressure force, and thereby additionally is supported.
  • the formation of voids between the workpiece and the Contact area can be minimized or completely prevented if this is the case is desired.
  • Such a compensating membrane can be made from one Plastic, a plastic foam, an elastomer or even made of metal or even consist of a composite of several of the materials mentioned.
  • a fluid cushion forms a particularly preferred compensating membrane.
  • the fluid can be a gas or, more preferably, an incompressible fluid act.
  • the compensating membrane is a hydro cushion.
  • the fluid chamber The fluid cushion can easily be pre-filled with fluid under a certain pressure his. More preferably, the fluid chamber has a shut-off valve in an inlet and outlet, For example, a simple check valve, and can through this inlet and outlet be filled with a pressure adapted to the respective application. Possibly Such an inlet and outlet can also be used during the implementation of the Workpiece shaping the pressure in the fluid cushion can still be controlled or regulated. about such an inlet and outlet can also result in a pressure loss of the cushion can be compensated for, which may arise over a long period of use established.
  • Figure 1 shows a forming device for deep drawing, deepening or just bending one Sheet metal 10.
  • the forming is hydraulic by pressing or applying the Workpiece 10 causes a die that a plurality n of rod-shaped, individual has movably mounted die elements 11.
  • the matrix can also be one Form flexible stamp and is therefore neutral called a tool.
  • the tool is axial by a tool frame 4 and in the frame 4 movable form elements 11 are formed.
  • the frame 4 is without shape elements in FIG shown.
  • the n shaped elements 11 are in accordance with their arrangement in the frame 4, but without the frame, shown in Figure 10.
  • the frame 4 is with a solid plate vertical through holes formed in a regular arrangement next to each other.
  • a receiving sleeve 7 is inserted in each of the through bores 5.
  • the Shaped elements 11 are slid closely in the receiving sleeves 7. Instead of being used in The shaped elements 11 could also be sleeves directly through the frame body be slidable, as shown in simplified form in FIG. 1.
  • Each of the shaped elements 11 has a head 15, a guide rod 12 and one support guide region 13 arranged therebetween.
  • the head 15 forms on his Free end of a contact surface for the workpiece 10. All shaped elements 11 together form the contact surface of the tool, but between the Tool contact surface and the workpiece still an elastic compensation membrane 2 is arranged.
  • the individual shaped element 11 is in the Frame 4 axially slidably guided.
  • the support guide area 13 is opposite
  • the guide rod 12 is thickened and shaped to such an extent that the support guide regions 13 of adjacent shaped elements 11 during axial movements of the shaped elements 11 slide against each other and in this way a guide for the shaped elements 11 in addition for sliding guidance of the guide rods 12 in the guide sleeves 6 is reached.
  • the heads 15 of the shaped elements 11 are movably mounted so that the individual heads 15 and thus the entire contact surface of the tool automatically at the Adapt the reshaping shape of the workpiece 10.
  • the mobile storage each of the heads 15 is carried out by means of a ball joint, which by a with the Support guide area 13 connected spherical body 14 and a spherical cap on the side of the Head 15 is formed.
  • a pressure vessel 1 is divided into two parts, a lower and an upper pressure chamber.
  • the Frame 4 is clamped between two parts of the pressure vessel 1 or in the one-piece pressure vessel 1 used and separates the two pressure chambers from each other.
  • the compensating membrane 2 covers the heads 15 of the Shaped elements 11.
  • the workpiece 10 lies flat on the membrane 2. in principle could dispense with the membrane 2, the workpiece 10 directly on the Heads 15 of the shaped elements 11 rest.
  • the forming force is by means of a pressure fluid, preferably one Hydraulic fluid applied to the workpiece 10. Over the whole For this purpose, the upper side of the workpiece becomes sufficient in a pressure chamber 20 Fluid pressure built up. Another is to form the pressure chamber 20 Pressure vessel 17 placed on the pressure vessel 1 and with the help of Hydraulic cylinders 22 of a pressing device 21 against the flange 3 of the Pressurized container 1 pressed. This is created over the entire top of the workpiece
  • the pressure chamber 20 faces the workpiece 10 Side sealed by an elastic membrane 19 fluid-tight. The membrane 19 lies immediately tight on the workpiece 10 when the two pressure vessels 1 and 17th are stacked on top of each other.
  • the pressure chamber 20 is thus in the form of a bubble which can be expanded by pressure educated. Although less preferred, the pressure chamber 20 could also be used without the Membrane 19 are formed, namely when otherwise a tight seal Pressure chamber 20 is ensured.
  • the pressure fluid is in one or more in fluid supply lines 18 incorporated into the pressure container 17 into the pressure chamber 20 promoted, for example by means of a pump and / or from a pressure reservoir.
  • the shaped elements 11 assume their starting position, in which all Shaped elements 11 are moved against the underside of the workpiece. In the event of a flat workpiece 10, as in the embodiment, are all Form elements 11 with respect to the underside of the workpiece at the same height.
  • the Heads 15 of the shaped elements 11 can be in front of other starting positions the pressurization of the workpiece top but also different heights take in.
  • Figure 2 shows the forming device after the forming of the workpiece 10.
  • Die Molded elements 11 assume their end positions. In the end positions they form the shaped elements 11 formed contact surface parts together the final shape, i.e. the Counterform, for the workpiece 10 pressed by the pressure force P.
  • the Membrane 2 will have an even surface.
  • the lower pressure chamber of the pressure container 1 is provided with a damping fluid, preferably a hydraulic fluid, completely filled.
  • the matrix frame 4 with the shaped elements 11 forms an at least largely tight seal for the lower pressure chamber of the pressure vessel 1.
  • the space above the die frame 4 can also be filled with the damping fluid.
  • this room is like in the exemplary embodiment, actually filled with the damping fluid, whereby a particularly evenly curved contact surface and also lubrication for the support guide areas 13 sliding against each other is obtained. It would also be possible to generate the damping primarily or only in the upper pressure chamber.
  • the In this case, shaped elements 11 would be set in the desired position End position or in intermediate positions in the case of a transformation carried out in stages serve. However, the shaped elements 11 preferably form piston rods with pistons, alone to make it easier to return to a starting position. Between the two rooms separated by the matrix frame 4 can be a free one Pressure equalization take place, but this is not absolutely necessary.
  • the the upper pressure space is also reduced by the deformation of the workpiece 10, so that on the underside of the elastic membrane 2 a over the entire surface of the Diaphragm 2 has a uniform fluid damping pressure.
  • a free Pressure equalization between the two pressure rooms also prevails in the upper pressure room the fluid pressure D.
  • the elastic membrane 2 is integrally connected to the heads 15, for example by gluing or by vulcanization. In principle, the membrane 2 also be mechanically connected to the heads 15, although this is less preferred becomes. Through the membrane 2, the heads 15 are tangential to the formed Contact surface connected elastically. Although less preferred, the elastic connection also only made by pressing the workpiece 10 become. However, a firm connection to the heads 15 prevents it from jumping back the membrane 2 when the pressure in the pressure chamber 20 is reduced.
  • the forming device is together with a fluid guide system shown immediately before the assembly of the two pressure vessels 1 and 17.
  • the shaped elements 11 are in the starting position shown in FIG. 1.
  • figure 3 shows fluidic elements provided in a discharge side of the damping fluid in FIG Positions that they assume during the forming process.
  • the pressure in the pressure chamber 20 required for the forming is determined by Actuation of a pressure intensifier 24 generated.
  • a drive pressure is generated by means of a motor-driven pump 23.
  • By the drive pressure is displaced by a double piston of the pressure booster 24, whereby on the output side of the pressure booster 24, which is connected to the pressure chamber 20 is, the pressure is increased in a closed fluid system.
  • This fluid system comprises the output side of the double piston 24, the pressure chamber 20, one in one Pressure reservoir formed fluid reservoir 25 and the corresponding Connection lines, as shown schematically in Figure 3.
  • the pressure in the Pressure chamber 20 is measured by means of a pressure sensor 26.
  • An engine M for the Pump 23 is driven in a controlled manner in accordance with the measurement signal of pressure sensor 26, to build up and maintain a certain pressure in the pressure chamber 20 received or to run a predetermined pressure profile.
  • the lower pressure chamber and the upper pressure chamber in the pressure container 1 are complete filled with the damping fluid and vented.
  • the pressure in the lower pressure chamber will recorded with a pressure sensor 45.
  • the output signal of the pressure sensor 45 becomes used to control or only monitor the outflow of the damping fluid.
  • the damping fluid is supplied to the outlet connected discharge line 37 discharged into a discharge manifold 42.
  • the discharge line 37 is a controllable shut-off valve 38 and a flow control valve 41 in Series connected in series. During the forming process, the shut-off valve is 38 open. The flow rate of the outflowing damping fluid and thus also that in damping force D generated in the lower fluid space of the pressure container 1 set by means of the flow control valve 41.
  • 37 is in the discharge line Reservoir 43 formed in a pressure container and a pressure relief valve 44 arranged. This flows from the upper fluid space in the pressure container 1 Damping fluid from a discharge line 39.
  • the discharge line 39 opens behind the shut-off valve 38 and before the flow control valve 41 and preferably also before a current sensor 46 in the discharge line 37
  • Current sensor 47 and a controllable shut-off valve 40 are arranged. The outflow rates Both fluid spaces in the pressure container 1 are connected to the one in the discharge line 37 arranged current sensor 46 and the current sensor 47 determined.
  • a pressure container can be used individually for each of the shaped elements 11 be provided.
  • a piston-cylinder system is provided in the pressure chamber.
  • the pressure in the upper pressure chamber is preferably less than the pressures of the piston-cylinder systems to the To be able to individually determine the travel speed of the shaped elements.
  • the the Heads 15 facing away from free ends of the shaped elements 11 are each used as pistons trained, which are slidably in their own pressure cylinder and at their Process due to the pressure force P in the pressure chamber 20 in the individual cylinders generate an individual damping force Dn.
  • the associated pressure cylinder is individually a discharge line 37 with a shut-off valve 38 and a flow control valve 41 and preferably also one Current sensor 46 provided.
  • the damping forces Dn for each of the Shaped elements 11 independent of the other shaped elements 11 can by corresponding control of the individual flow control valves 41 the speed the axial movement of each individual molded element 11 individually adjusted and if necessary, can also be specifically changed during the forming process.
  • the flow of material in the workpiece 10 throughout Forming process can be controlled particularly precisely. The position along the Travel is made for each of the shaped elements 11 with the aid of corresponding sensors determined and compared in a control with the end position to be approached.
  • a pressure intensifier is in the fluid guide system for fixing the shaped elements 31 is provided for generating a clamping pressure for the shaped elements 11.
  • a The drive side of the pressure booster 31 is connected to a pressure line 30.
  • the Output side of the pressure intensifier 31 is connected to the tool frame 4.
  • the Pressurized fluid is fed into the via one feed line 34 per shaped element 11 Die frame 4 led directly into each of the receiving sleeves 7.
  • In the Feed lines 34 each have a controllable shut-off valve 33. In the The shut-off valves 33 are each formed until the individual fixing Form elements 11 locked.
  • each of the Shaped elements 11 each have a vent line 35 and in each vent line 35 Check valve 36 provided.
  • the supply side for the pressure fluid with individual clamping ability is the Shaped elements 11 shown.
  • the tool frame 4 is 11 for each of the shaped elements an individual feed line 34 with a controllable shut-off means 33.
  • Figures 5 and 6 show how the flexible tool is also more flexible Stamp can be used.
  • the usability as a stamp allows the To advance workpiece 10 before deep drawing or deep drawing. By pre-stretching pre-consolidation will be obtained. By pre-stretching, in particular Strength of slightly arched molded parts compared to pure deep drawing or Lows are increased.
  • the flexible stamp is also a pure stretching tool or even used as a bending tool with advantage, although a tool that can form both a die and a stamp, a preferred one Further development of the pure die and the pure stamp represents.
  • the workpiece 10 lies on the elastic membrane 2 in FIG clamped in a clamping device.
  • the clamping device is from the side arranged, movable jaws 8 and the clamping of the jaws 8th serving hydraulic cylinders 9 formed.
  • FIG. 5 shows the shaped elements 11 in the starting position before the preliminary stretching.
  • the workpiece 10 is close to the plasticity limit by the Clamping device 8, 9 clamped.
  • the starting position of the Shape elements 11 selected such that the shape elements 11 for pre-stretching against the First push out the underside of the workpiece and press it for deep drawing or deep drawing then again as already described using the one shown in FIG Starting position can be retracted and retracted.
  • the later damping fluid is preferably also used as a pressure fluid for the extension of the shaped elements 11 used.
  • the supply side for the pressurized fluid for extending is the same as for Filling the or the pressure containers to generate the damping force Retraction.
  • the fluid discharge side for the damping fluid is also advantageous adopted identically.
  • the shut-off valves 38 and 40 are on the Laxative side when extending in its locked states.
  • Figures 7 and 8 show a preferred clamping device with which each of the Shaped elements 11 both when movable into a collective pressure vessel and with movability in individual pressure containers in any desired position Regarding its direction of movement independently of the other shaped elements 11 can be fixed.
  • 7 clamping sleeves 6 are in the receiving sleeves used.
  • Each of the clamping sleeves 6 is fixed in a receiving sleeve 7 axial and radial seat added.
  • the installation situation of a single clamping sleeve 6 in the tool frame 4 is shown in Figure 8.
  • a receptacle sleeve 7 is first made into a circular cylindrical one Through hole of the frame 4 used.
  • the receiving sleeves 7 are in the frame 4th fixed radially and axially.
  • one is in each of the receiving sleeves 7 Clamping sleeve 6 inserted against a flange formed in the receiving sleeve 7.
  • a closure sleeve 7a is inserted into each of the receiving sleeves 7, preferably screwed.
  • Each of the ferrules 6 is between the radially inward protruding flange of their receiving sleeve 7 and the closure sleeve 7a with axially fixed Seat mounted.
  • Each of the clamping sleeves 6 preferably has on its two end faces a radially outwardly projecting flange that is already for a fixed radial Seat of the clamping sleeve 6 in its receiving sleeve 7 ensures.
  • the clamping sleeve 6 is in essentially formed by a radially flexible, axially rigid sleeve jacket. in the assembled state remains between this radially flexible sleeve casing and surrounding receiving sleeve 7 an annular gap through in the axial direction Sealing rings 7b is sealed.
  • At least one sealing ring 7b is in a groove in the Flange of the receiving sleeve 7 and at least one further sealing ring 7b is in a Groove of the closure sleeve 7a inserted. Seal these at least two sealing rings 7b the annular gap around the sleeve jacket of the clamping sleeve 6 against the guide rod 12 of the through the relevant clamping sleeve 6 guided form elements.
  • the radial one Resilience of the clamping sleeve 6 is due to the axial weakening of the sleeve shell, for example, by axial recesses or slots. If the Sleeve jacket of the clamping sleeve 6 is broken, the sleeve jacket is one enclosed cover sleeve.
  • a fluid pressure sufficient to clamp the guide rods 12 is built up and maintained during the forming process.
  • the associated shut-off valve 33 opened and the annular gap around the clamping sleeve 6 is pressurized.
  • the Clamping sleeve 6 widens radially inwards due to the external hydraulic pressure.
  • the shape element 11 in question is hereby instantly clamped and locked in the position just reached.
  • FIGS. 11 and 12 show alternative embodiments of the shaped element heads 15 shown.
  • the heads 15 are preferably in the direction of movement of the shaped elements 11 resilient.
  • the elastic compliance can be achieved for example be that the heads 15 themselves are formed from an elastomeric material.
  • elasticity can also be obtained by appropriately shaping the heads 15 , of which the head 15 shown in Figure 12 gives an example.
  • the elastic Resilience in the direction of movement of the molded element 11 can also be achieved by a Combination of material elasticity and design elasticity can be achieved.
  • the head 15 FIG. 12 shows a full central area from the workpiece in plan view of which radially projecting arms at equal angular intervals, thinner towards the outside become.
  • the workpiece 10 is covered over the entire surface or at any time at least almost completely supported.
  • individual form elements 11 of a die almost without resistance or with much less Resistance than the adjacent molded elements 11 to give way or even local To produce cavities into which the workpiece 10 then preferably deforms.
  • by an elastic connection of the shaped element heads and application damping pressure minimizes or completely eliminates the formation of local cavities be prevented. It is also advantageous that the tool according to the invention is very useful a flexible stamp can easily be formed.
  • the invention was based on the Exemplary embodiments only in the preferred interaction with a pressure fluid described for generating the pressure force P.
  • the flexible die is an advantage not even in connection with one during the forming process changeable stamp or a flexible stamp of the type described as Counterpart can be used to generate the forming force.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Jigs For Machine Tools (AREA)
EP01120668A 2000-09-01 2001-08-31 Outil flexible pour déformation d'une pièce Withdrawn EP1184102A3 (fr)

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Cited By (13)

* Cited by examiner, † Cited by third party
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EP1503087A2 (fr) * 2003-07-30 2005-02-02 Theodor Gräbener GmbH & Co. KG Unité de cylindres pour se fixer à une traverse et/ou à une table d'un dispositif ou d'une machine pour la transformation des pièces
CN100363126C (zh) * 2005-08-10 2008-01-23 中国科学院金属研究所 一种板材液压或气压成形方法及装置
JP2009262229A (ja) * 2008-03-31 2009-11-12 Fuji Heavy Ind Ltd プレス加工装置
CN102120235A (zh) * 2010-12-14 2011-07-13 吉林大学 一种用于多点拉形的充液垫
CN102205366A (zh) * 2010-11-15 2011-10-05 吉林大学 可重构单向连续模具型面的柔性拉形装置
CN102716965A (zh) * 2012-07-15 2012-10-10 哈尔滨工业大学空间钢结构幕墙有限公司 多点无模快速调形液压胀形工艺及胀形设备
US20120291512A1 (en) * 2009-12-28 2012-11-22 Pusan National University Industry- University Cooperation Foundation Sheet-material forming device and method
CN106180396A (zh) * 2016-07-14 2016-12-07 中国商用飞机有限责任公司 基于多点模具的刚性模具薄板拉伸成形方法
DE102016103389A1 (de) 2016-02-25 2017-08-31 Gabriel Pausch Formgebungsvorrichtung zur Herstellung gekrümmter Flächen
CN110052520A (zh) * 2019-05-28 2019-07-26 湖南科技大学 一种组合式机械加载蠕变时效成形装置
CN110405053A (zh) * 2019-08-05 2019-11-05 南京工程学院 一种渐进成形辅助热加工装置及其热加工方法
CN113386337A (zh) * 2021-06-10 2021-09-14 四川航天长征装备制造有限公司 一种多级可调压痕模
CN116550848A (zh) * 2023-07-11 2023-08-08 成都飞机工业（集团）有限责任公司 一种用于金属板材工件的多点电磁成形装备及方法

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CN100418658C (zh) * 2006-07-28 2008-09-17 哈尔滨工业大学 可以提高板材零件成形极限所使用的加工装置及加工方法
DE102010052739B4 (de) 2010-11-26 2023-12-28 Cellcentric Gmbh & Co. Kg Verfahren und Vorrichtung zur Herstellung von Bauelementen für eine elektrochemische Zelle, insbesondere eine Brennstoffzelle, oder einen elektrochemischen Energiespeicher
CN102728696B (zh) * 2012-07-15 2016-07-06 哈尔滨工业大学空间钢结构幕墙有限公司 数控多点无模液压胀形工艺及数控多点无模液压胀形设备
CN102814379A (zh) * 2012-09-05 2012-12-12 哈尔滨工业大学空间钢结构幕墙有限公司 板材连续成形的数控多点无模液压胀形系统
CN103878228B (zh) * 2014-02-26 2016-04-27 哈尔滨工业大学（威海） 板材柔性多点成形装置
DE102016225986A1 (de) * 2016-12-22 2018-06-28 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung und Verfahren zum Formen eines Bleches
DE102018107391B4 (de) * 2018-03-28 2022-08-18 MDS e.K. Säulensystem

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US3172453A (en) * 1962-12-31 1965-03-09 Todd Shipyards Corp Position control for multiple tools
US4288021A (en) * 1979-10-03 1981-09-08 Mcdonnell Douglas Corporation Tooling for superplastic forming diffusion bonding processes
JPS60191621A (ja) * 1984-03-12 1985-09-30 Ishikawajima Harima Heavy Ind Co Ltd 金属板のプレス成形方法
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1503087A3 (fr) * 2003-07-30 2005-07-20 Theodor Gräbener GmbH & Co. KG Unité de cylindres pour se fixer à une traverse et/ou à une table d'un dispositif ou d'une machine pour la transformation des pièces
EP1503087A2 (fr) * 2003-07-30 2005-02-02 Theodor Gräbener GmbH & Co. KG Unité de cylindres pour se fixer à une traverse et/ou à une table d'un dispositif ou d'une machine pour la transformation des pièces
CN100363126C (zh) * 2005-08-10 2008-01-23 中国科学院金属研究所 一种板材液压或气压成形方法及装置
JP2009262229A (ja) * 2008-03-31 2009-11-12 Fuji Heavy Ind Ltd プレス加工装置
US20120291512A1 (en) * 2009-12-28 2012-11-22 Pusan National University Industry- University Cooperation Foundation Sheet-material forming device and method
CN102205366A (zh) * 2010-11-15 2011-10-05 吉林大学 可重构单向连续模具型面的柔性拉形装置
CN102205366B (zh) * 2010-11-15 2012-09-05 吉林大学 可重构单向连续模具型面的柔性拉形装置
CN102120235A (zh) * 2010-12-14 2011-07-13 吉林大学 一种用于多点拉形的充液垫
CN102120235B (zh) * 2010-12-14 2012-07-04 吉林大学 一种用于多点拉形的充液垫
CN102716965A (zh) * 2012-07-15 2012-10-10 哈尔滨工业大学空间钢结构幕墙有限公司 多点无模快速调形液压胀形工艺及胀形设备
DE102016103389A1 (de) 2016-02-25 2017-08-31 Gabriel Pausch Formgebungsvorrichtung zur Herstellung gekrümmter Flächen
CN106180396A (zh) * 2016-07-14 2016-12-07 中国商用飞机有限责任公司 基于多点模具的刚性模具薄板拉伸成形方法
CN106180396B (zh) * 2016-07-14 2019-03-05 中国商用飞机有限责任公司 基于多点模具的刚性模具薄板拉伸成形方法
CN110052520A (zh) * 2019-05-28 2019-07-26 湖南科技大学 一种组合式机械加载蠕变时效成形装置
CN110052520B (zh) * 2019-05-28 2023-08-25 湖南科技大学 一种组合式机械加载蠕变时效成形装置
CN110405053A (zh) * 2019-08-05 2019-11-05 南京工程学院 一种渐进成形辅助热加工装置及其热加工方法
CN113386337A (zh) * 2021-06-10 2021-09-14 四川航天长征装备制造有限公司 一种多级可调压痕模
CN116550848A (zh) * 2023-07-11 2023-08-08 成都飞机工业（集团）有限责任公司 一种用于金属板材工件的多点电磁成形装备及方法
CN116550848B (zh) * 2023-07-11 2023-11-10 成都飞机工业（集团）有限责任公司 一种用于金属板材工件的多点电磁成形装备及方法

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