EP3342503A1 - Verfahren und vorrichtung zur befestigung mindestens zweier metallischer werkstücke - Google Patents

Verfahren und vorrichtung zur befestigung mindestens zweier metallischer werkstücke Download PDF

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Publication number
EP3342503A1
EP3342503A1 EP16206971.0A EP16206971A EP3342503A1 EP 3342503 A1 EP3342503 A1 EP 3342503A1 EP 16206971 A EP16206971 A EP 16206971A EP 3342503 A1 EP3342503 A1 EP 3342503A1
Authority
EP
European Patent Office
Prior art keywords
workpieces
punch
workpiece
electrodes
fastening
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Withdrawn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
EP16206971.0A
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English (en)
French (fr)
Inventor
Alois Birgmann
Georg KIROV
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.)
LKR Leichtmetallkompetenzzentrum Ranshofen GmbH
Original Assignee
LKR Leichtmetallkompetenzzentrum Ranshofen 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 LKR Leichtmetallkompetenzzentrum Ranshofen GmbH filed Critical LKR Leichtmetallkompetenzzentrum Ranshofen GmbH
Priority to EP16206971.0A priority Critical patent/EP3342503A1/de
Priority to EP17825549.3A priority patent/EP3562606B1/de
Priority to PCT/EP2017/084641 priority patent/WO2018122261A1/en
Publication of EP3342503A1 publication Critical patent/EP3342503A1/de
Withdrawn legal-status Critical Current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
    • B21J15/02—Riveting procedures
    • B21J15/08—Riveting by applying heat, e.g. to the end parts of the rivets to enable heads to be formed
    • 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

Definitions

  • the invention concerns a method for fastening at least two metallic workpieces together by a punch rivet.
  • the invention concerns a device for fastening at least two metallic workpieces together by a punch rivet.
  • Punch riveting is a joining method which gains increasing importance, in particular in automotive industry.
  • so called C-rivets are used, for example punch rivets according to EP 0 720 695 .
  • An object of the invention is to provide a method for fastening at least two metallic workpieces together by a punch rivet which allows fastening workpieces from sheets of heat treated aluminium alloys and other alloys which are difficult to fasten by punch riveting without significant appearance of cracks in the fastening region.
  • a further object of the invention is to provide a device for a corresponding method.
  • a method for fastening at least two metallic workpieces together by a punch rivet wherein at least one workpiece is heated to an elevated temperature for setting the punch rivet.
  • At least one of the workpieces to be fastened is heated to an elevated temperature for setting the punch rivet.
  • the at least one workpiece can be heated only before setting the punch rivet so that the punch rivet is set at a still elevated temperature during the setting of the punch rivet.
  • heating of the at least one workpiece leads, in comparison with room temperature, to a higher ductility of the at least one workpiece which is made of a metal or an alloy. This, in turn, allows providing connected workpieces which are free from cracks in the fastening region. This is one of the quality criterions for parts used in automotive industry.
  • the workpieces will be in conductive contact at least during the riveting process. Therefore, it is sufficient to heat at least only one workpiece to an elevated temperature for setting the punch rivet. For example, a lower workpiece can be heated to a desired temperature for setting the punch rivet whereas an upper workpiece receives heating indirectly by contact with the lower workpiece.
  • Heating only one workpiece of the workpieces to be connected is, hence, principally sufficient. However, if short cycle times are desired, it is advantageously to heat all workpieces to be connected simultaneously. This allows faster reaching of temperature conditions within the workpieces for a setting of a punch rivet.
  • the method according to the invention can be applied to parts of any shape.
  • the parts to be connected are sheets, for example sheets with a thickness between 0.1 mm and 5.0 mm.
  • the at least one workpiece can be heated with any conventional heating means, for example an oven or a gas burner.
  • any conventional heating means for example an oven or a gas burner.
  • the at least one workpiece is preferably heated electrically.
  • An electrical heating generally allows a very exact temperature control within the workpieces to be fastened.
  • the at least one workpiece is contacted by electrodes.
  • the electrodes can be made from any material.
  • the electrodes are copper electrodes.
  • the temperature of the least one workpiece is set to a temperature of 100°C to 250°C, in particular 120°C to 180°C, preferably 130°C to 160°C.
  • a temperature of at least 100°C is necessary in order to achieve a good ductility for setting a punch rivet. Temperatures higher than 200°C are not useful as the ductility would be too large.
  • Preferred temperature regions are within 120°C to 180°C, in particular 130°C to 160°C.
  • a method according to the invention can be applied to all metallic materials regardless whether steel, aluminium and its alloys or other light weight metals and its alloys like magnesium and its alloys.
  • the method is applied to sheets made from heat treated aluminium alloys which are otherwise difficult to fasten with punch rivets without cracks developing.
  • the invention provides a device for fastening at least two metallic workpieces together by a punch rivet, comprising a die, a riveting punch, the riveting punch being moveable toward the die, a blank holder for holding the workpieces during movement of the riveting punch toward the die for setting the punch rivet to fasten the workpieces, wherein a heating element is provided for heating at least one of the workpieces.
  • a device allows to heat metallic workpieces to be fastened by a punch rivet before and, if applicable, during setting of the rivet. Due to the heating of at least one workpiece, it is possible to produce in particular connected sheets of heat treated aluminium alloys which are at least almost free of cracks in the fastening region.
  • the heating element is an electrical heating element.
  • the heating element can comprise copper electrodes for contacting at least one workpiece.
  • the copper electrodes are then part of an electrical circuit so that the workpiece to be heated can be supplied with a voltage. This leads to a heating of the at least one workpiece.
  • the device can also comprise a cooling circuit wherein the copper blocks are coolable by the cooling circuit.
  • very high current densities and current flows are possible which leads to high heating rates for the at least one workpiece to be heated.
  • the electrodes withstand very high current intensities during heating of the at least one workpiece.
  • the copper electrodes are exchangeable.
  • a device 10 for punch riveting is depicted.
  • the device 10 comprises a die 5 and a riveting punch 6.
  • the riveting punch 6 is movable up and down as indicated by the arrow in Fig. 1 .
  • the device 10 further comprises two or more electrodes 4 for which are made from copper or another high conducting material. Copper, however, is the preferred choice for the electrodes 4.
  • the electrodes 4 are connected to one or more copper blocks 9.
  • the copper blocks 9, in turn, are connected to a cooling circuit (not depicted).
  • the copper blocks 9 are structured so that water can pass through internal channels of the copper blocks 9.
  • the copper blocks 9 are cooled by simply winding some loops of a flexible tube around the copper blocks 9 so that cooling is achieved in this way.
  • the copper blocks 9 may alternatively also be connected indirectly or directly to a cooling circuit. In any case, the copper blocks 9 can be cooled by a further element of the device 10.
  • the riveting punch 6 carries a punch rivet 3.
  • the workpieces 1, 2 are hold by a blank holder 7.
  • a lower workpiece 1 is heated by a heating element 8.
  • the heating element 8 comprises the copper electrodes 4.
  • the lower workpiece 1 is placed on the die so that simultaneously the electrodes 4 are conducted.
  • the electrodes could also be flexible so that the electrodes 4 are positioned on a lateral side of the lower workpiece 1. It is also possible that the electrodes 4 are clamping element which clamp both workpieces 1, 2 so that both workpieces 1, 2 are electrically conducted.
  • the lower workpiece 1 is heated by the heating element 8 with the electrodes 4.
  • the lower workpiece 1 is heated by resistance heating.
  • the heating is continued at least until the riveting punch 6 is lowered.
  • the heating can also be continued during the fastening process.
  • usually that is not necessary as the riveting process is much faster than a temperature loss of the workpieces 1, 2.
  • the workpieces 1, 2 to be fastened are in close contact with each other before the riveting process.
  • both workpieces 1, 2 are made of a metallic material, i.e., a metal or alloys, the upper workpiece 2 will also be heated even when only the lower workpiece 1 is contacted with the electrodes 4.
  • the workpieces 1, 2 are heated to suited temperatures. Suited temperatures for later setting of the punch rivet 3.
  • suitable temperatures are in the temperature region 100°C to 200°C. In particular suited temperatures lie between 130°C and 180°C.
  • a power source is provided for the electrodes 4.
  • the power source can operate with up do 14V direct current and a current of to 10 kA. Due to the high current intensities, the copper blocks 9 are water cooled so that the device 10 operates despite very high current densities.
  • Fig. 2a and 2b typical dies 5 are shown which were used in order for a punch rivet fastening of workpieces 1, 2 without and with heating.
  • the dies 5 are commercially available from Böllhoff GmbH.
  • Fig. 2a depicts a so called PZ geometry;
  • Fig. 2b depicts a so called FM geometry.
  • the aluminium alloy was of the grade EN AW 7075 T6. This alloy was chosen because this alloy is setting the highest demands for mechanical joining.
  • FIG. 3a and 3b photographs of a top view of two workpieces 1, 2 of an aluminium alloy EN AW 7076 T6 are shown.
  • the workpieces 1, 2 where fastened by a C-rivet at room temperature.
  • cracks are observed. This is the case for the FM geometry ( Fig. 3a ) as well as PZ geometry ( Fig. 3b ).
  • Fig. 4 to 4d corresponding photographs are shown for workpieces 1, 2 of the same material but fastened at the temperature at 140°C ( fig. 4a, 4b ) and 150°C ( Fig. 4c, 4d ) with the FM geometry.
  • Fig. 5a to 5d analogous results are shown for the PZ geometry also at 140°C ( Fig. 5a, 5b ) and 150°C ( Fig. 5c, 5d ).
  • the workpieces 1, 2 with a so called C-rivet at the temperature of about 140°C to 160°C leads to a crack free connection of the workpieces 1, 2.
  • the temperature for the setting process can be adapted for the workpieces 1, 2 to be fastened in order to achieve an optimum ductility during the setting process. Therefore, the number of possible combinations of rivets and workpieces 1, 2 to be fastened is significantly increased.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
  • Connection Of Plates (AREA)
EP16206971.0A 2016-12-27 2016-12-27 Verfahren und vorrichtung zur befestigung mindestens zweier metallischer werkstücke Withdrawn EP3342503A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP16206971.0A EP3342503A1 (de) 2016-12-27 2016-12-27 Verfahren und vorrichtung zur befestigung mindestens zweier metallischer werkstücke
EP17825549.3A EP3562606B1 (de) 2016-12-27 2017-12-27 Verfahren und vorrichtung zur befestigung mindestens zweier werkstücke
PCT/EP2017/084641 WO2018122261A1 (en) 2016-12-27 2017-12-27 Method and device for fastening at least two workpieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16206971.0A EP3342503A1 (de) 2016-12-27 2016-12-27 Verfahren und vorrichtung zur befestigung mindestens zweier metallischer werkstücke

Publications (1)

Publication Number Publication Date
EP3342503A1 true EP3342503A1 (de) 2018-07-04

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EP16206971.0A Withdrawn EP3342503A1 (de) 2016-12-27 2016-12-27 Verfahren und vorrichtung zur befestigung mindestens zweier metallischer werkstücke
EP17825549.3A Active EP3562606B1 (de) 2016-12-27 2017-12-27 Verfahren und vorrichtung zur befestigung mindestens zweier werkstücke

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP17825549.3A Active EP3562606B1 (de) 2016-12-27 2017-12-27 Verfahren und vorrichtung zur befestigung mindestens zweier werkstücke

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EP (2) EP3342503A1 (de)
WO (1) WO2018122261A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110877078A (zh) * 2019-11-13 2020-03-13 刘泓亮 一种用于铝型材加工的冲铆装置
EP3562606B1 (de) * 2016-12-27 2021-11-10 LKR Leichtmetallkompetenzzentrum Ranshofen GmbH Verfahren und vorrichtung zur befestigung mindestens zweier werkstücke

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3095971B1 (fr) * 2019-05-15 2022-05-27 Psa Automobiles Sa Procédé et installation d’assemblage d’au moins deux tôles par rivetage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0720695A1 (de) 1993-09-29 1996-07-10 Audi Ag Selbststanzende befestigungsvorrichtung
US6417490B1 (en) * 1997-11-17 2002-07-09 Technische Universitaet Dresden Method and device for thermally supporting mechanical joints
US20030167621A1 (en) * 2002-03-08 2003-09-11 Pei-Chung Wang Method and apparatus for riveting metal members
EP2514537A1 (de) * 2011-09-20 2012-10-24 Aleris Aluminum Duffel BVBA Verfahren zum Stanznieten von Aluminiumlegierungsblech

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100083481A1 (en) * 2008-10-08 2010-04-08 Gm Global Technology Operations, Inc. Method for attaching magnesium panels using self-piercing rivet
EP3342503A1 (de) * 2016-12-27 2018-07-04 LKR Leichtmetallkompetenzzentrum Ranshofen GmbH Verfahren und vorrichtung zur befestigung mindestens zweier metallischer werkstücke

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0720695A1 (de) 1993-09-29 1996-07-10 Audi Ag Selbststanzende befestigungsvorrichtung
US6417490B1 (en) * 1997-11-17 2002-07-09 Technische Universitaet Dresden Method and device for thermally supporting mechanical joints
US20030167621A1 (en) * 2002-03-08 2003-09-11 Pei-Chung Wang Method and apparatus for riveting metal members
EP2514537A1 (de) * 2011-09-20 2012-10-24 Aleris Aluminum Duffel BVBA Verfahren zum Stanznieten von Aluminiumlegierungsblech

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3562606B1 (de) * 2016-12-27 2021-11-10 LKR Leichtmetallkompetenzzentrum Ranshofen GmbH Verfahren und vorrichtung zur befestigung mindestens zweier werkstücke
CN110877078A (zh) * 2019-11-13 2020-03-13 刘泓亮 一种用于铝型材加工的冲铆装置

Also Published As

Publication number Publication date
EP3562606A1 (de) 2019-11-06
EP3562606B1 (de) 2021-11-10
WO2018122261A1 (en) 2018-07-05

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