EP1034055B1 - Procede et dispositif pour realiser un assemblage estampe rivete - Google Patents

Procede et dispositif pour realiser un assemblage estampe rivete Download PDF

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Publication number
EP1034055B1
EP1034055B1 EP98966245A EP98966245A EP1034055B1 EP 1034055 B1 EP1034055 B1 EP 1034055B1 EP 98966245 A EP98966245 A EP 98966245A EP 98966245 A EP98966245 A EP 98966245A EP 1034055 B1 EP1034055 B1 EP 1034055B1
Authority
EP
European Patent Office
Prior art keywords
punch
down device
holding
varied
dependence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98966245A
Other languages
German (de)
English (en)
Other versions
EP1034055A2 (fr
Inventor
Dirk Hermann
Dieter Mauer
Reinhold Opper
Joachim Möser
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.)
Newfrey LLC
Original Assignee
Newfrey LLC
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Filing date
Publication date
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Priority to DE29824739U priority Critical patent/DE29824739U1/de
Publication of EP1034055A2 publication Critical patent/EP1034055A2/fr
Application granted granted Critical
Publication of EP1034055B1 publication Critical patent/EP1034055B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B21J15/025—Setting self-piercing rivets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/16—Drives for riveting machines; Transmission means therefor
    • B21J15/20—Drives for riveting machines; Transmission means therefor operated by hydraulic or liquid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/28—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/28—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups
    • B21J15/285—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups for controlling the rivet upset cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating
    • Y10T29/49771—Quantitative measuring or gauging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating
    • Y10T29/49771—Quantitative measuring or gauging
    • Y10T29/49776—Pressure, force, or weight determining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49998—Work holding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53039—Means to assemble or disassemble with control means energized in response to activator stimulated by condition sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53039—Means to assemble or disassemble with control means energized in response to activator stimulated by condition sensor
    • Y10T29/53061—Responsive to work or work-related machine element
    • Y10T29/53065—Responsive to work or work-related machine element with means to fasten by deformation
    • Y10T29/5307—Self-piercing work part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5343—Means to drive self-piercing work part

Definitions

  • the object of the invention relates to a method and to a Device for producing a punch rivet connection according to the preamble of claims 1 and 20 (see, for example, WO-A-94/14554).
  • riveted joints In the automotive industry in particular, riveted joints always win more important as they can be an alternative to the welded joint. In the case of poorly weldable material pairings, riveted joints create a suitable alternative.
  • the parts to be connected are riveted without Punched together.
  • the prepunching required for conventional riveting Joined parts are replaced by a corresponding cutting process of the punch rivet.
  • the components to be connected are opened laid a matrix. These are fixed on the die by a hold-down device.
  • the semi-tubular rivet cuts through the layer facing the semi-tubular rivet. After that the semi-tubular rivet in or in the lower layers to form a Closing head plastically deformed.
  • the shape of the closing head is in essentially determined by the shape of a die. That from the top layer and material punched out from other layers may fill the hollow one Rivet shaft of the semi-tubular rivet and is locked captive. After that the semi-tubular rivet compressed, so that on the one hand further training of the Closing head takes place and the head of the semi-tubular rivet essentially is flush with the top layer.
  • WO 94/14554 proposes a device which has a die, a hold-down and a stamp. Between the The hold-down device and the die can be clamped to at least two layers of components.
  • the hold-down device can be moved via a first piston-cylinder unit.
  • a second Piston-cylinder unit is provided as the drive unit for the stamp.
  • the first and second piston-cylinder units are independent of each other actuated.
  • a similar embodiment of a device for producing a Punch rivet connection is known from WO 93/24258.
  • This device too has a piston-cylinder unit through which the necessary clamping force of the Hold-down can be generated on. By appropriate pressure control different clamping forces can be generated.
  • the device after the WO 93/24258 has a second piston-cylinder unit as the drive unit of the Stamp on.
  • the mechanical properties of a punch riveted joint especially that The strength behavior of the punch rivet connection depends on the design of the Closing head.
  • the strength behavior is also determined by the design of the Area of the components between the head and the closing head of the punch rivet affected.
  • the present invention has the object that further develop known methods for producing a punch rivet connection, that on the one hand a gentle production of a punch rivet connection and on the other hand, a punch rivet connection with higher strength is achieved.
  • Another object of the invention is an apparatus for producing a Specify punch rivet connection that is suitable for protecting the material Make rivet connection.
  • the device is also intended to achieve that the punch rivet connection produced by the device is high Strength values reached.
  • the clamping force acting on the components from the hold-down device is changeable, since this depends on the movement of the stamp achieved that the sufficient for individual sections of the punch riveting process necessary clamping force is applied.
  • the measure by which the clamping force is changed depends on the coupling status. In particular suggested that the coupling state depending on the stamp path or a parameter derived from the stamp path is changed.
  • the layers first with a reduced clamping force can be pressed against the die. After that you can the layers with a varying compared to the reduced clamping force Clamping force against the die.
  • the Clamping force can be increased during the upsetting process. This has the advantage that in the case of a formation of the head of the hollow rivet at least partially surrounding bead, this is compressed by the hold-down device so that the head of the hollow rivet is flush with the layer.
  • the clamping force can also be significantly higher than the usual clamping force.
  • the variation of the coupling state depending on the stamp path can be carried out continuously or discontinuously.
  • a continuous change in the Coupling state is preferred because it does not change the Clamping force occurs. Even if there is a discontinuous change in the Coupling state, the jumps in the clamping force can be selected so that there is no pronounced sudden change in the process parameters.
  • the Hold down By rigidly coupling the hold-down with the stamp, the Hold down the same movement as the stamp.
  • the hold-down brings in essentially the same force as the stamp.
  • the clamping force can be controlled by controlling the coupling unit the hold-down device can be uncoupled from the punch.
  • the further application of clamping force the hold-down device is controlled via the coupling unit. Should after a given punch path of the hold-down device a higher force on the layers exercise, the hold-down device can be connected to the Stamp can be coupled.
  • the hold-down device with the stamp should be too connecting layers is moved so that the hold-down the layers with a predetermined clamping force presses against the die.
  • the hold-down is from that Stamp decoupled and the stamp for severing at least that Half-rivet facing position, a training of a closing head Move the compression of the semi-hollow rivet further, the holder if necessary a predetermined stamp path is coupled to the stamp.
  • the clamping force varies depending on the stamp path preferably according to a predetermined course of the clamping force in Dependence on the stamp path.
  • the specified clamping force-stamp path curve is a target profile, which is preferably continuous with the actual profile of the Clamping force depending on the stamp path is compared. To do this suggested that a stamp path be measured or one from the stamp path derived parameter is compared with a predetermined target size.
  • the hold-down device is preferably of Stamp decoupled or coupled to the stamp.
  • the process according to the invention also makes it gentle plastic deformation of the punch rivet ensured in at least one position without that this layer or these layers is excessively weakened.
  • a Excessive weakening of the layer or layers can lead to an unwanted Punch through this layer or layers.
  • a punching through of the situation or the layers would become one depending on the material pairings Cause corrosion. This problem arises with the method according to the invention however not on.
  • the Coupling state depending on the material properties, in particular of the strength, at least one layer is changed.
  • This beneficial Further training is based on the idea that the locations are different Flow behavior or deformation behavior can have.
  • a clamping force-stamp path course depending on the Properties of the pairing of layers made of different materials changed becomes. For example, if you want a layer of aluminum or an aluminum alloy with a second layer of aluminum or an aluminum alloy by means of a Punch rivets are connected, the coupling state is changed differently than for an aluminum / steel connection. It can also be taken into account here that the coupling state can also depend on which one Material properties, the layer to be punched or the layer to be formed having.
  • the clamping force can be compared to layers with a relatively small thickness, be chosen higher, because thick layers have a different stress behavior exhibit.
  • the thick layer is overstressed compared to a thin one Position much later because there is enough material for a flow movement in the Matrix and to the semi-tubular rivet is available.
  • the coupling state depending on the material properties of the Punch rivets is changed.
  • the criterion for changing the Coupling state suggested the hardness of the punch rivet.
  • the geometry of the punch rivet in particular the design of the free one End face of the punch rivet, as well as the recess of the semi-tubular rivet plays for the Design of the rivet connection a role.
  • the geometry of the punch rivet influences the stamping and forming process. It is therefore proposed that the coupling state depending on a geometry of the punch rivet is changed.
  • the geometry of the punch rivet can also be individual Geometric sizes of the punch rivet can be used as a criterion.
  • the cross section of the punch rivet, the length of the Punch rivets can be used as factors.
  • the other geometrical ones too Sizes of a punch rivet can be used as criteria for choosing a suitable one Coupling status curve can be used.
  • the coupling state can be at least during at least one Part of an upsetting process can be reduced to such an extent that it is essentially transverse movement of at least one layer to the semi-tubular rivet is made possible. This ensures that a material flow during the formation of the Closing head occurs so that the layers in the area of the punch rivet connection less mechanical stress, especially tensile stress, get abandoned
  • a stamping force of the Stamp are determined and compared with a predetermined target size, the hold-down device preferably depending on the stamping force and / or the stamp path is decoupled from the stamp or with the stamp is coupled.
  • the clamping force of the hold-down can be during the Punch riveting process determined and compared with a predetermined target size become. By comparing the clamping force depending on Stamp path can be varied.
  • a target characteristic curve of a clamping force-stamp path can be determined by tests be determined.
  • Punch rivet connection is valid.
  • the Determination of a target characteristic curve for a given punch riveting task Extrapolation of the known target characteristics an assumed target characteristic are determined as the basis for the comparison with the clamping force-stamp path can serve.
  • the hold-down to the Stamp is coupled depending on a stamp force. It can also be one Coupling of the hold-down device to the stamp take place when the stamp force and the The path of the stamp lies within a certain tolerance range.
  • a clamping force of the hold-down device is measured directly or indirectly.
  • the Hold-down devices can be used depending on the clamping force and / or the punch force and / or the travel path of the stamp decoupled from the stamp or to the Stamp can be coupled.
  • the Hold-down devices have a piston and the plunger has a pressure piston
  • the Piston and the pressure piston relative to each other within a common Chamber are movable, with a between the piston and the pressure piston Fluid, preferably an essentially incompressible fluid, is provided, the distance between the piston and the pressure piston relative to each other in is essentially changed by the fluid, in particular the fluid volume.
  • the Chamber with the fluid as well as the piston and the pressure piston form the Coupling unit.
  • the hold-down executes a movement corresponding to the stamp path when the stamp is moved Change in position.
  • the fluid volume is changed during the stamp movement in such a way that this is reduced, the stamp carries out a larger one Stamp movement as the hold-down.
  • the hold-down can with appropriate Change in the fluid volume to be stationary, the force with which the Hold-down acts on the components, variable or constant depending can be changed by the fluid volume. In a corresponding manner, the Fluid pressure of the coupling state can be influenced.
  • At least a portion of the fluid from the chamber is in a Compensating chamber passed, whereby the relative position of the piston and the Pressure piston is changed to each other.
  • the speed at which one Change in position of the piston and the pressure piston can occur through the Flow rate of the fluid from the chamber can be influenced. Through the Flow rate is thus also the rate of change of Clamping force influenced.
  • the fluid flowing out of the chamber into a reservoir is used to form a Another punch rivet connection from the compensation chamber into the chamber returned, whereby a closed fluid flow is achieved.
  • the hold-down device is connected to a piston which in a double-acting cylinder is arranged, through which the stamp passes extends.
  • the stamp has a pressure piston which is in a preferably incompressible, fluid-loaded chamber is guided.
  • the Chamber is connected to a volumetrically variable reservoir.
  • the Chamber is rigidly connected to the cylinder and slidably in a housing guided.
  • the change in fluid pressure is preferably dependent on Stamp path and / or the travel path of the hold-down device and / or the clamping force and / or the stamp force.
  • a fluid pressure is preferably dependent on the Stamp path determined and the fluid pressure-stamp path course with a predetermined target course compared.
  • a pressure-regulating valve fluidically connected to the chamber. By the Pressure control valve controls the fluid pressure in the chamber.
  • the fluid removal is preferably dependent on the clamping force and / or the stamp force and / or the travel path of the stamp and / or the Controlled travel of the hold-down device.
  • the pressure piston causes one Pressure build-up of the fluid in the chamber, causing the fluid to pressure the The hold-down piston exerts and the hold-down moves in the direction of the layers becomes.
  • Has the hold-down device for clamping the layers between the hold-down device and the matrix has the necessary force, for example, by suitable Fluid removal from the chamber of the stamp continues to move, the The clamping force between the hold-down device and the die is retained. Is a stronger one Volume change due to fluid withdrawal from the chamber as the conditional Volume change due to the change in stamp travel, so the clamping force of the Hold-down device, the punch performing the actual punch riveting process.
  • the layers are initially to be applied with a reduced clamping force against the die and then with a higher clamping force compared to the reduced clamping force can be pressed against the die, so this can be done by no or only a minor one Fluid is withdrawn from the chamber.
  • a device for Production of a punch rivet connection with a die, a hold-down and proposed a stamp The stamp and the hold-down are for the die movable to and from this. Between the hold-down device and a die At least two layers of components can be clamped.
  • a punch rivet that is for example, a half-rivet, a full rivet, can be done by means of Stamp to connect the layers at least through the hold-down driven adjacent position of the components.
  • the device is characterized in that a coupling unit is provided, which connects the hold-down and the stamp so that during a Punch riveting a coupling of the hold-down with the punch between an essentially rigid coupling state and a decoupled state can be changed.
  • the stamp is driven by a drive unit.
  • the hold-down device a piston crown and the punch one Have pressure pistons.
  • the piston and the pressure piston are in one with one, preferably incompressible, fluid-filled chamber of the coupling unit movable relative to one another, the fluid pressure in the chamber being variable.
  • a control device which is used to control the Coupling unit is used.
  • the control unit can be used to achieve that Coupling unit during a punch riveting process from the hold-down to the at least two layers of clamping force exerted according to a predetermined one Course depending on at least the stamp path or one from the Stamp path derived parameter is varied.
  • Fluid pressure can be controlled by withdrawing fluid from the chamber, so that the relative position of the piston with respect to the pressure piston by volume of the removed fluid is dependent.
  • the device preferably has a compensation chamber into which at least a line conducts at least a portion of the fluid during a punch riveting operation conductive from the chamber, and for a renewed punch riveting process from the Compensating chamber can be returned to the chamber.
  • a pressure control valve can control the fluid pressure in the chamber.
  • a pressure sensor is provided for measuring the fluid pressure with the control device connected is.
  • the control device is also the pressure control valve connected.
  • a fluid pressure is preferably dependent on the stamp path determined and a fluid pressure stamp path curve or a characteristic curve determines this by means of the control device with a predetermined target course compared and the pressure valve depending on the comparison accordingly driven. This ensures that the clamping force is essentially above the Fluid pressure control is controlled.
  • the hold-down device is connected to a piston which in a double-acting cylinder is arranged.
  • the stamp has a pressure piston which is in one with a incompressible fluid acted chamber is guided.
  • the chamber is with connected to a variable-volume reservoir.
  • the chamber is with the Cylinder rigidly connected and slidably guided in a housing.
  • the device has a path measuring device through which at least a stroke of the punch is measured, and the hold-down is dependent is decoupled from the travel of the stamp or is coupled to the stamp.
  • the course of the path change of the stamp can lead to a quality statement about the punch rivet connection to be achieved are used.
  • a quality check the punch rivet connection can already during the training of Punch rivet connection can be made.
  • the measuring device is preferably arranged on the stamp.
  • the device be a Has measuring device through which a stamp force of the stamp is measured or is determined, the hold-down depending on the punch force and / or the stamp path decoupled from the stamp or with the stamp is coupled.
  • the measurement of the clamping force of the hold-down can also be used for quality assurance be used.
  • the force of the stamp or the clamping force of the hold-down suitable time of decoupling or coupling the hold-down device with the Stamp can be determined.
  • the path of the hold-down device can also be measured with suitable means.
  • the distance measurement of the hold-down device can provide information about the thickness of the connecting layers of the components are used, so that the path of Stamp with knowledge of the thickness of the layers can be determined. This is particularly important if the thickness of the layers is due to manufacturing tolerances is within a tolerance range. hereby is also avoided, for example, by means of a punch rivet connection self-piercing punch rivets do not cut through the lowest layer through the punch rivet becomes.
  • the layers can also be pressed against each other by the hold-down device be that they lie against each other before the actual punch riveting process is triggered.
  • the stamp can be driven by means of a hydraulic drive unit.
  • a hydraulic drive unit it is also proposed that the stamp by means of a motor, in particular an electromotive, drive unit is driven. Through the drive unit, the stamp performs an im essential linear motion.
  • Figure 1 shows schematically and in section a device for producing a Punch rivet.
  • the device has a hold-down device 1, a stamp 2 and a die 3.
  • the hold-down device 1 is towards the die 3 and away from it movable.
  • In the illustration of Figure 1 are between the die 3 and the Hold-down 1 two layers 4, 5 of components shown.
  • the layers 4, 5 are clamped between the hold-down device 1 and the die 3.
  • Schematic is one Punch rivet 8 shown, which rests on the layer 4.
  • the hold-down device 1 surrounds the punch 2.
  • the punch 2 is also toward the die 3 and movable away from it.
  • the device has a coupling unit 6, which the hold-down device 1 and the Stamp 2 connects so that a coupling of the Hold-down 1 with the stamp 2 between a substantially rigid Coupling state and a decoupled state can be changed.
  • the coupling unit 6 has a piston 9 connected to the hold-down device 1
  • a plunger 10 is connected to the plunger 2.
  • the piston 9 and the Pressure pistons 10 are displaceable relative to one another within a chamber 11.
  • the chamber 11 is delimited by a housing 12.
  • the chamber 11 is equipped with a preferably substantially incompressible, fluid 7 filled. The fluid pressure inside the volume-variable chamber 11 through the housing 12, the Piston 9 and the pressure piston 10 is limited, is changeable.
  • the piston 9 has a circumferential groove 13 in which a sealing ring 14 is arranged is. This results in a seal of the piston 9 with respect to the inner jacket of the Housing 12 reached.
  • a through opening 15 is located within the piston 9 formed, through which the stamp 2 extends. Also between the The outer surface of the through opening 15 and the stamp 2 is fluid-tight Connection provided by a sealing ring 16 which in a groove 17 of the Piston 9 is arranged, is formed.
  • a housing part 18 is provided, in which one Return spring 19 is arranged.
  • the housing part 18 is connected to the housing 12 connected.
  • the housing part 18 is preferably screwed to the housing 12.
  • the return spring 19 is at one end with the hold-down 1 and with opposite end connected to the housing 12. With a movement of the Retaining spring 19 is tensioned in the direction of layers 4, 5. By the hold-down device 1 can retract the pretension of the return spring 19 become.
  • the compensation chamber 20 On the chamber 11 opposite end face of the pressure piston 10 is a Compensation chamber 20 formed.
  • the compensation chamber 20 has a connection 22 through which an elastic compensating element 21 can be pressurized is.
  • the stamp 2 extends through an end plate 23.
  • a sealing element 24 is arranged, which seals on the Outer jacket of the stamp 2 is applied.
  • the housing 12 is connected to a frame 25.
  • Figure 1 shows one Path measuring device 26 through which the stamp path can be measured.
  • the Displacement measuring device 26 is connected to a control device 27.
  • the Control device 27 is connected to a pressure sensor 28 via a sensor line 36 connected.
  • the pressure sensor 28 is arranged in a line 29, which via a Port 30 is connected to the chamber 11.
  • a line 35 leads to the Compensation chamber 20.
  • a pressure control valve 31 which has a Control line 32 is connected to the control device 27.
  • the hold-down device 1 is with for as long the punch 2 rigidly coupled until the hold-down 1 has a predetermined clamping force on layers 4, 5.
  • the clamping force is dependent on the pressure of the fluid in the chamber 11 determined by the pressure sensor 28.
  • the stamp 2 with the rivet 8 is positioned on the layer 4. This position forms for example a reference position from which a path measurement of the stamp 2 he follows. Then the punch 2 drives the punch rivet 8 into at least the position 4. Here, the path of the stamp 2 through the path measuring device 26 measured. The path measuring device 26 transmits an output signal to the Control device 27.
  • line 29 is at least partially released, so that a fluid 7 can flow out of the chamber 11 via the line 29. simultaneously the pressure piston 10 moves in the direction of the die 3 without the Clamping force of the hold-down 1 is changed.
  • the fluid flowing out of the chamber 11 becomes the compensation chamber 20 fed.
  • the pressure sensor 28 measures the pressure throughout the process within the chamber 11 and transmits this to the control device 27. If the First hold down the layers with a reduced clamping force and then with a higher clamping force than the current clamping force press against the die, the control device 27 will Pressure control valve 31 is at least partially closed. When closed Pressure control valve 31 is again a quasi-rigid connection between the stamp 2 and the hold-down 1 manufactured.
  • a punch riveting process During a punch riveting process, at least part of the fluid flows out of the Chamber 11 in the compensation chamber 20. It is for a new punch riveting process necessary that the fluid from the compensation chamber 20 into the chamber 11th flowing back. This can be done via line 35.
  • a channel 33 is provided within the piston 10, in which a Check valve 34 is arranged.
  • the check valve 34 is designed such that this a return flow of the fluid from the compensation chamber 20 into the chamber 11 allows. This will cause a possible foaming if it is in the fluid is a pneumatic oil prevented.
  • the drive unit of the device is preferably an electric motor.
  • the Electromotive drive unit is connected to the transmission unit Stamp connected. This ensures that a rotational movement of the electromotive drive unit via the transmission unit in a Translational movement of the stamp is achieved. This avoids that an abrupt load on the device occurs, as is the case, for example, with known hydraulic devices is the case.
  • At the transmission unit it is preferably at least one gear.
  • the gear is preferably a reduction gear. This has the advantage that a drive unit can be used with a relatively low torque.
  • the relatively minor Torque of the drive unit through the reduction gear depending on Reduction ratio in a correspondingly higher torque or force on the Transfer stamp.
  • the electromotive drive unit is preferably with the control device connected.
  • the course of the clamping force of the hold-down device can be controlled via the control device 27 be specified.
  • the control device 27 preferably comprises at least one electronic data processing device.
  • Figure 2 shows a second embodiment of an apparatus for manufacturing a punch rivet connection.
  • the device has an essentially cylindrical housing 12.
  • a stamp 2 is arranged in the housing.
  • the stamp 2 is at one end with a setting spindle 53 connected.
  • the setting spindle 53 is with a not shown Drive connected.
  • the setting spindle 53 extends through a spindle nut 38.
  • Between an end face of the housing 12 and the spindle nut 38 is a Thrust bearing 37 arranged.
  • a cylinder 39 is arranged inside the housing 12. It is preferably the cylinder 39 is a hydraulic synchronous cylinder
  • the cylinder 39 has a chamber 40 and a chamber 11.
  • the chambers 11, 40 are through a pressure piston 10 separated from each other. This is with the stamp 2 connected.
  • a further cylinder 41 is arranged in the housing 12 and is connected to the cylinder 39 is firmly connected.
  • the cylinders 39 and 40 are axial within the housing 12 Slidably mounted towards the housing.
  • the cylinder 41 delimits a chamber 42 in which a piston 9 is arranged.
  • the Piston 9 is connected to a hold-down device 1.
  • the stamp 2 extends through the piston 9 and by the hold-down 1, which preferably the stamp 2 all around.
  • the exemplary embodiment shows that a punch rivet 8 is arranged within the hold-down 1.
  • the cylinder 39 has two connections 30, 43.
  • the connection 30 is via a Line 44 connected to a compensation unit 45.
  • Compensation unit 45 has a reservoir 46 into which the line 44 opens.
  • a piston 47 is arranged inside the reservoir 46.
  • the piston 47 is connected to a spindle 48 Drive 50 connected.
  • the spindle 48 and the piston 47 are designed such that the piston 47 at least partially moved out of the reservoir 46 or can be driven into this, so that the volume of the Chamber 46 changes depending on the position of the piston 47.
  • the chamber 40 can be supplied with air via the connection 43.
  • the cylinder 41 has two connections 51, 52, through which air preferably flows in the chamber 42 of the cylinder 41 can be introduced, so that the piston 9 and thus also the hold-down device 1 can be moved to the layers 4, 5 and away from them.
  • Figure 3 shows the device 2 in an initial position.
  • the piston 10 is located itself in a middle position within the cylinder 39.
  • the piston 47 of the Compensation unit 45 has assumed an end position in which the volume of the Chamber 46 is the lowest.
  • the piston 9 has reached an end position in which the hold-down device 1 can be equipped with a punch rivet 8. In the hold-down 1 is a punch rivet 8 introduced.
  • FIG. 4 shows the position of the punch rivet described above 8 within the hold-down device 1.
  • the hold-down 1 with the punch rivet are spaced apart from those to be connected Components, as can be seen from Figure 4.
  • the punch 2 By interaction of the Setting spindle 53 with the spindle nut 38, the punch 2 in the direction of the components method.
  • the volume of the chamber 11 remains unchanged.
  • the cylinder 39 and the Cylinder 41 are moved with the hold-down device 1 in the direction of the layers 4, 5.
  • the hold-down device 1 exerts a clamping force on the layers 4, 5.
  • the hold-down device 1 and the stamp 8 lifted from the layers 4, 5. Withdrawal takes place via the Setting spindle 53, the pressure of the fluid in chamber 40 preferably is kept constant so that the cylinders 39, 41 simultaneously with the movement of the stamp can be moved, as shown in Figure 7.
  • the stamp is in move its end position further. That passed from chamber 11 into chamber 46 Fluid volume during the formation of the punch rivet connection is from the Chamber 46 returned to chamber 11 This is done by the fact that Drive 50 of the piston 47 is stirred into the chamber 46. The chamber 42 will acted on with a fluid so that the piston 9 in its lower end position is proceeded. Another punch rivet can be inserted into the hold-down.
  • the punching device is provided for a new punch riveting process. It can a new punch riveting process can be carried out accordingly.
  • FIG. 1 A clamping force-stamp path diagram is shown schematically in FIG.
  • the production of a punch rivet connection with a hollow rivet can be done in the Sections cutting, spreading and upsetting can be divided.
  • the form of the individual sections can have different strengths.
  • the clamping force-stamp path diagram shows that shortly before the end of the Upsetting the clamping force of the hold-down compared to the reduced Clamping force increases. This should allow any training of beads or Warps that rise above the head of the punch rivet into the upper position be pushed in.
  • the course of the clamping force as a function of the stamp travel is shown in FIG. 9 shown schematically. It can be adapted to different punch riveting tasks become. In particular, the course of the clamping force can be a function of the connecting components, as well as the punch rivet.
  • a further course of a clamping force as a function of is dashed Stamp path shown.
  • the course shows that the clamping force initially up to a predetermined value increases and is held at this value.
  • the clamping force is given for a given one Stamp stroke increased and then decreased again.
  • the device according to the invention is also suitable for other designs of Suitable rivet connections, in particular by means of hollow rivets, full rivets and like. It is not imperative that self-piercing be carried out by a rivet.

Claims (31)

  1. Procédé pour la réalisation d'un assemblage estampé riveté, dans lequel au moins deux couches (4, 5) sont pressées par un serre-flan (1) contre la matrice (3), et un rivet, en particulier un rivet semi-creux (8), traverse pour un assemblage des couches (4, 5) au moyen d'un poinçon (2) au moins la couche (4) associée au rivet semi-creux (8), est déformé dans cette couche ou dans la couche inférieure (5) pour la formation d'une tête fermante et est ensuite estampé, caractérisé en ce que le serre-flan (1) est relié au poinçon (2) par l'intermédiaire d'un dispositif (6) de couplage et que pendant un processus d'estampage-rivetage le couplage du serre-flan (1) au poinçon (2) est modifié entre un état de couplage essentiellement serré et un état découplé.
  2. Procédé selon la revendication 1, caractérisé en ce que l'état de couplage est modifié en fonction du déplacement du poinçon ou d'une grandeur caractéristique obtenue à partir du déplacement du poinçon.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'état de couplage est modifié en fonction de propriétés de matériaux, en particulier d'une résistance, d'au moins une couche.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que l'état de couplage est modifié en fonction de propriétés d'un couple formé par des couches (4, 5) en divers matériaux.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'état de couplage est modifié en fonction du nombre de couches (4, 5).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'état de couplage est modifié en fonction de l'épaisseur d'au moins une couche (4, 5), en particulier la couche (4, 5) associée au rivet (8) à estamper.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que l'état de couplage est modifié en fonction de propriétés de matériaux du rivet (8) à estamper.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que l'état de couplage est modifié en fonction de la dureté du rivet (8) à estamper.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que l'état de couplage est modifié en fonction de la géométrie du rivet (8) à estamper.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'état de couplage est modifié au moins dans une portion finale du processus d'estampage afin que la force exercée par le serre-flan (1) soit augmentée.
  11. Procédé selon la revendication 10, caractérisé en ce que l'état de couplage du serre-flan (1) est modifié pour que la force de serrage soit augmentée de sorte que la tête soit assemblée pratiquement de niveau avec la couche (4) associée au rivet (8) à estamper.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que le serre-flan (1) est déplacé avec le poinçon (2) en direction des couches (4, 5) et que le serre-flan (1) presse les couches (4, 5) contre une matrice (3) avec une force de serrage prédéterminée, que le serre-flan (1) est partiellement découplé du poinçon (2) et que le poinçon (2) est encore déplacé pour transpercer au moins la couche (4) associée au rivet (8) à estamper afin de former une tête fermante et pour estamper le rivet semi-creux (8), pendant que le serre-flan (1) est couplé au poinçon (2) après soit un déplacement prédéterminé du poinçon soit d'après une grandeur caractéristique obtenue à partir du déplacement dû poinçon.
  13. Procédé selon la revendication 12, caractérisé en ce qu'un déplacement du poinçon est mesuré et que le déplacement du poinçon ou une grandeur caractéristique obtenue à partir du déplacement du poinçon sont comparés à une valeur prédéterminée de référence, au moyen de quoi l'état de couplage du poinçon (2) est modifié en fonction du résultat de la comparaison.
  14. Procédé selon la revendication 12 ou 13, dans lequel une force d'estampage du poinçon (2) est déterminée et comparée à une valeur prédéterminée de référence, afin que l'état de couplage soit modifié en fonction de la force d'estampage et/ou du déplacement dû poinçon (2).
  15. Procédé selon la revendication 12, 13 ou 14, dans lequel une force de serrage du serre-flan est déterminée et comparée à une valeur prédéterminée de référence, afin que l'état de couplage soit modifié en fonction de la force de serrage et/ou de la force d'estampage et/ou du déplacement du poinçon (2).
  16. Procédé selon l'une des revendications 1 à 15, dans lequel le serre-flan (1) comporte un piston (9) et le poinçon (2) un piston plongeur (10), le piston (9) et le piston plongeur (10) peuvent se déplacer l'un par rapport à l'autre dans une chambre (11) du dispositif (6) de couplage remplie avec un fluide de préférence incompressible, afin que la pression de fluide dans la chambre (11) soit modifiée et que le poinçon (2) soit entraíné par un dispositif d'entraínement.
  17. Procédé selon l'une des revendications 1 à 15, dans lequel le serre-flan (1) est relié à un piston (9) qui est disposé dans un cylindre (41) dans lequel pénètre le poinçon (2), le poinçon (2) comporte un piston plongeur (10) qui est guidé dans un cylindre (39) rempli d'un fluide incompressible, qui est relié à une chambre (46) d'équilibrage, dans lequel les cylindres (39, 41) sont étroitement liés et sont guidés à coulissement dans un boítier (12).
  18. Procédé selon la revendication 16 ou 17, dans lequel une pression de fluide est réglée en fonction de la force de serrage et/ou de la force d'estampage et/ou du déplacement du poinçon et/ou du déplacement du serre-flan (1).
  19. Procédé selon la revendication 17, dans lequel, en fonction de la force de serrage et/ou de la forcé d'estampage et/ou du déplacement du poinçon et/ou d'une comparaison entre une valeur réelle et une valeur de référence, un organe (31) de positionnement placé en communication fluide avec la chambre (11) est commandé.
  20. Appareil pour la réalisation d'un assemblage estampé riveté avec une matrice (3), un serre-flan (1) et un poinçon (2), dans lequel le poinçon (2) et le serre-flan (1) peuvent se déplacer dans les deux sens par rapport à la matrice (3), dans lequel entre le serre-flan (1) et la matrice (3) au moins deux couches (4, 5) de pièces peuvent être serrées, et un rivet (8) à estamper peut être enfoncé dans au moins la couche (4) voisine du serre-flan (1) pour l'assemblage des couches (4, 5) au moyen du poinçon (2), caractérisé par un dispositif (6) de couplage qui relie le serre-flan (1) et le poinçon (2) de sorte que pendant un processus d'estampage-rivetage un couplage du serre-flan (1) avec le poinçon (2) puisse être modifié entre un état de couplage essentiellement serré et un état découplé, et par un dispositif d'entraínement qui entraíne le poinçon (2).
  21. Appareil selon la revendication 20, caractérisé en ce que le serre-flan (1) comporte un piston (9) et le poinçon (2) comporte un piston plongeur (10), que le piston (9) et le piston plongeur (10) peuvent se déplacer l'un par rapport à l'autre dans une chambre (11) du dispositif (6) de couplage remplie avec un fluide de préférence incompressible, dans lequel la pression de fluide dans la chambre (11) peut être modifiée.
  22. Appareil selon la revendication 21, caractérisé en ce qu'un dispositif (27) de commande est prévu pour la commande du dispositif (6) de couplage, au moyen duquel pendant un processus d'estampage-rivetage une force exercée par le serre-flan (1) sur les au moins deux couches (4, 5) correspondant à une évolution prédéterminée varie en fonction au moins du déplacement du poinçon ou d'une grandeur obtenue à partir du déplacement du poinçon.
  23. Appareil selon la revendication 21 ou 22, caractérisé en ce qu'au moins une chambre (20) d'équilibrage est prévue, dans laquelle par l'intermédiaire d'au moins une conduite (29, 35), une partie du fluide peut être évacuée de la chambre (11) et lui être restituée.
  24. Appareil selon la revendication 23, caractérisé en ce que dans au moins une conduite (29) une vanne (31) de réglage de pression ou une vanne de réglage proportionnel est prévue.
  25. Appareil selon la revendication 22, 23 ou 24, caractérisé en ce qu'un capteur (28) de pression est prévu pour mesurer une pression de fluide.
  26. Appareil selon la revendication 25, caractérisé en ce que le dispositif (27) de commande est relié au capteur (28) de pression et à ladite au moins une vanne (31) de réglage de pression.
  27. Appareil selon la revendication 26, caractérisé en ce que des moyens sont prévus par lesquels une pression de fluide est déterminée en fonction du déplacement du poinçon et qu'une évolution pression de fluide-déplacement du poinçon ou une évolution de valeur caractéristique est extraite, cette pression est comparée au moyen du dispositif (27) de commande avec une valeur prédéterminée de référence et que la vanne (31) de réglage de pression est commandée en fonction de la comparaison.
  28. Appareil selon la revendication 20, caractérisé en ce que le serre-flan (1) est relié à un piston (9) qui est disposé dans un cylindre (41) dans lequel s'étend le poinçon (2), que le poinçon (2) comporte un piston plongeur (10) qui est guidé dans un cylindre (39) pouvant être rempli avec un fluide incompressible, et que le cylindre (39) est relié à un réservoir dont le volume est variable, dans lequel les cylindres (39, 41) sont liés étroitement et sont guidés à coulissement dans un boítier (12).
  29. Appareil selon une des revendications 20 à 28, caractérisé par un dispositif de mesure pour mesurer un déplacement du poinçon (2), de sorte que l'état de couplage soit modifié en fonction du déplacement du poinçon.
  30. Appareil selon une des revendications 20 à 29, caractérisé par un dispositif de mesure au moyen duquel une force du poinçon (2) est mesurée ou déterminée, de sorte que l'état de couplage soit modifié en fonction de la force du poinçon et/ou le déplacement du poinçon.
  31. Appareil selon une des revendications 20 à 30, caractérisé par un dispositif de mesure au moyen duquel une force de serrage du serre-flan (1) est mesurée ou déterminée, afin que l'état de couplage soit modifié en fonction de la force de serrage et/ou de la force du poinçon et/ou du déplacement du poinçon.
EP98966245A 1997-11-26 1998-11-26 Procede et dispositif pour realiser un assemblage estampe rivete Expired - Lifetime EP1034055B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29824739U DE29824739U1 (de) 1997-11-26 1998-11-26 Vorrichtung zur Herstellung einer Stanznietverbindung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19752367 1997-11-26
DE19752367A DE19752367A1 (de) 1997-11-26 1997-11-26 Verfahren und Vorrichtung zur Herstellung einer Stanznietverbindung
PCT/EP1998/007621 WO1999026743A2 (fr) 1997-11-26 1998-11-26 Procede et dispositif pour realiser un assemblage estampe rivete

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EP1034055A2 EP1034055A2 (fr) 2000-09-13
EP1034055B1 true EP1034055B1 (fr) 2002-03-13

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US (1) US6543115B1 (fr)
EP (1) EP1034055B1 (fr)
JP (1) JP2001523581A (fr)
AU (1) AU2267099A (fr)
DE (2) DE19752367A1 (fr)
WO (1) WO1999026743A2 (fr)

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EP1640081A1 (fr) * 2004-09-24 2006-03-29 Böllhoff Verbindungstechnik GmbH Procédé d'assemblage et dispositif de commande d'un outil d'assemblage
KR100794637B1 (ko) * 2004-09-24 2008-01-14 뵐호프 베르빈둥스테크니크 게엠베하 체결 공구용 접합 방법 및 장치
US7475473B2 (en) 2004-09-24 2009-01-13 Bollhoff Verbindungstechnik Gmbh Device for operating a fastening tool
DE102019122276A1 (de) * 2019-08-20 2021-02-25 Voith Patent Gmbh Die Erfindung betrifft einen Niederhalter für einen Prozess bei Stanzen und/oder Nieten
WO2021032730A1 (fr) 2019-08-20 2021-02-25 Voith Patent Gmbh Dispositif de retenue pour un processus pendant l'estampage et/ou le rivetage

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JP2001523581A (ja) 2001-11-27
WO1999026743A3 (fr) 1999-07-22
DE59803377D1 (de) 2002-04-18
WO1999026743A2 (fr) 1999-06-03
DE19752367A1 (de) 1999-05-27
US6543115B1 (en) 2003-04-08
AU2267099A (en) 1999-06-15
EP1034055A2 (fr) 2000-09-13

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