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WO2003013759A1 - Procede et dispositif pour produire un raccord d'assemblage a froid par liaison de forme - Google Patents

Procede et dispositif pour produire un raccord d'assemblage a froid par liaison de forme Download PDF

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Publication number
WO2003013759A1
WO2003013759A1 PCT/DE2002/002668 DE0202668W WO03013759A1 WO 2003013759 A1 WO2003013759 A1 WO 2003013759A1 DE 0202668 W DE0202668 W DE 0202668W WO 03013759 A1 WO03013759 A1 WO 03013759A1
Authority
WO
WIPO (PCT)
Prior art keywords
hold
down device
layers
piston
stamp
Prior art date
Application number
PCT/DE2002/002668
Other languages
German (de)
English (en)
Inventor
Dieter Mauer
Original Assignee
Newfrey Llc
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 Newfrey Llc filed Critical Newfrey Llc
Publication of WO2003013759A1 publication Critical patent/WO2003013759A1/fr

Links

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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B21D39/031—Joining superposed plates by locally deforming without slitting or piercing
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/06—Use of special fluids, e.g. liquid metal; Special adaptations of fluid-pressure systems, or control of elements therefor, to the use of such fluids
    • F15B21/065—Use of electro- or magnetosensitive fluids, e.g. electrorheological fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F16F9/3405—Throttling passages in or on piston body, e.g. slots
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/532—Electrorheological [ER] fluid dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/535—Magnetorheological [MR] fluid dampers

Definitions

  • the subject of the invention is a method and a device for producing a positive cold-joint connection.
  • cold joint connections represent a more than suitable alternative.
  • the parts to be connected for example metal sheets, are connected to a punch rivet from two sides without prepunching.
  • the pre-punching of the joint parts required in a conventional riveting process is replaced by a corresponding cutting process caused by the self-piercing rivet itself.
  • the sheet metal components to be connected are placed on a die.
  • the sheet metal components are pressed against the die by a hold-down device and thus fixed.
  • the semi-tubular rivet punches through the layers facing it and then this is plastically deformed in the lower, die-side layer to form a closing head with radial expansion, the shape of the closing head inevitably being essentially determined by the shape of the die.
  • the material punched out of the upper layer fills the hollow rivet shank of the semi-hollow rivet and is thereby captively enclosed.
  • the semi-tubular rivet is compressed, which leads to the closing head and the head being further developed of the semi-tubular rivet is essentially flush with the upper layer of the sheet metal components.
  • a device with a holding-down device which can be moved via a piston-cylinder unit in such a way that the clamping force of the holding-down device, by means of which the layers are fixed on the die, counteracts End of the punch riveting process increases significantly. This ensures that there is no subsequent flow during punching.
  • a method for producing a punch rivet connection ensures that no annular depressions or distortions occur in the region of the head of the punch rivet.
  • a similar piston-cylinder unit for generating a necessary clamping force of the hold-down device is known from WO 93/24258.
  • the generation of different clamping forces is achieved during the punch riveting process by means of a correspondingly varying pressure control.
  • the mechanical properties of a punch rivet connection in particular the strength behavior the punch rivet connection depending on the design of the closing head.
  • the strength behavior is essentially influenced by the configuration of the area of the components between the head and the closing head of the punch rivet.
  • the present invention is based on the object of developing the known method for producing a cold joint connection in such a way that precise and functionally reliable control of the clamping force with simultaneous production of such a Chen cold joint connection is guaranteed with a higher strength.
  • Another object of the invention is to provide a device for carrying out such a method.
  • the device according to the invention for producing a cold joint connection is characterized in that during the joining process a clamping force exerted by a hold-down device on at least two layers of workpieces is varied in that the viscosity of a working fluid acting on the hold-down device and thereby its flow properties can be actively influenced.
  • an electro-rheological fluid is used as the working fluid in an embodiment of the device.
  • Electro-rheological liquids are dispersions of finely divided, electrically polarizable particles in hydrophobic, highly electrically insulating oils which, under the influence of an electric field with a sufficiently strong electric field strength, quickly and reversibly change their flow limit or their shear or shear modulus over several orders of magnitude ,
  • the electro-rheological fluid may change from a low viscosity to a plastic to almost a solid state.
  • the response time is in the range of a few milliseconds. This makes it possible, for example, to provide an excellently actively controllable mechanism if such an electro-rheological fluid is within a Piston-cylinder unit is used, as is already known, for example, from German Offenlegungsschrift DE 197 35 898 AI.
  • a change in viscosity is also associated with a corresponding change in the vaporization behavior of such a device.
  • a so-called magneto-rheological fluid is used as the working fluid.
  • Magneto-rheological liquids are suspensions of finely divided magnetic particles with a particle size of a few mm to a few ⁇ m in suitable liquids, such as mineral or silicone oils, the solids content of the suspension typically being about 20 to 60% by volume. Magneto-rheological liquids change their flow resistance under the influence of a strong magnetic field depending on the magnetic field strength. Depending on the type, they reach shear stress values of up to 100 kPa.
  • the rheological properties of the respective fluids can thus be steplessly controlled via an electrical or magnetic field.
  • the device according to the invention has a, preferably cylindrical, piston which is arranged concentrically around the punch which forms the cold joint connection between the components. Like the plunger, this piston is guided in a hollow cylindrical hold-down device in which the electro-rheological or magneto-rheological fluid is received.
  • the piston separates two liquid chambers which, according to the invention, are connected by at least one, preferably annular, traversing channel for guiding the respective liquid during the axial movement of the piston within the housing of the hold-down device.
  • electrodes which are insulated from one another are arranged for applying an electrical high voltage to be varied in a targeted manner.
  • At least one magnetic coil is provided to generate a magnetic field that can be varied in a targeted manner.
  • such magnetic coils can also be arranged outside the piston, preferably in the housing wall of the hold-down device.
  • the electrical signal or the magnetic signal for the targeted influencing of the flow properties of the respective liquids is generated in a corresponding manner via a control device, the control taking place as a function of the relative position of the plunger and the hold-down device.
  • the viscosity of the respective type of liquid and thus its flow through the channel when the piston is displaced relative to the hold-down device is specifically adjusted.
  • the electrical or magnetic field generated by the high voltage in the channel increases the viscosity of the electro- or magneto-rheological fluid within the channel in such a way that, against the flow resistance caused thereby, only a fraction of that when moving away the amount of liquid required by the piston can pass through the channel.
  • This increases the pressure in the lower liquid chamber and thus the pressure exerted on the hold-down by the piston, which acts as a clamp. transferred force to the layers of the components to be connected.
  • the clamping force exerted by the hold-down device can thus be continuously and specifically influenced according to the invention.
  • the method that can be carried out by the device according to the invention is characterized in that the course of the clamping force during the cold joining process is varied according to a predetermined course depending on the stamp path or advantageously a characteristic quantity derived from the stamp path.
  • the acceleration and / or the speed of the stamp can be used as parameters here.
  • the stamp path in turn corresponds absolutely to the path covered in the layers or the penetration depth of the joint element.
  • a call can be made by comparing, preferably in real time, the stamp path and the pressure prevailing in the liquid with predetermined values.
  • the course of the variation according to the invention can also take place in terms of control technology as a function of the workpiece properties of the layers of components to be joined together and / or the workpiece properties and / or the shape of the joint element.
  • the device and the method which can be carried out according to the invention for producing a cold joint connection can not only be limited to the cold joint process of punch riveting, but also allow use in the connecting method of so-called clinching through several layers of workpieces which does not require a joint element and which are punched through the layers and clamped to one another via the flow of the punched-through material areas that occurs.
  • Figure 1 shows schematically and in section a first embodiment of the inventive device for producing a punch rivet connection.
  • FIG. 2 shows schematically and in section a second embodiment of the device according to the invention for producing a punch rivet connection
  • Fig. 4 shows schematically and in section a fourth embodiment of the device according to the invention for producing a clinching connection.
  • Figure 1 shows schematically a section through a device for producing a punch rivet connection.
  • the device has a hold-down device 1, a punch 2 and a die 3.
  • the hold-down device 1 can be moved toward and away from the die 3.
  • Two layers 4, 5 of components are arranged between the die 3 and the holding-down device 1. These layers 4, 5 are clamped between the hold-down device 1 and the die 3.
  • the punch 2 is actuated by a device F, not shown, with a force F and thus drives a schematically illustrated punch rivet 6 through the layers 4, 5 of the workpieces for their connection.
  • the hold-down device 1 is in one piece and cylindrical and surrounds the punch 2 so that it is guided axially.
  • the piston 7 separates two liquid chambers 8 and 9, each of which contains an electro-rheological liquid 10.
  • a second piston 11 which is freely movable around the plunger 2 m in the longitudinal direction thereof, delimits the upper liquid chamber 9 and thus forms a compensation chamber 12 filled with a gas.
  • the piston is penetrated by an annular channel 13 which connects the two liquid chambers 8 and 9 to one another, so that the electro-rheological liquid 10 can flow between these liquid chambers 8 and 9.
  • the channel walls of the channel 13 are formed by high-voltage electrodes 14 and 15, which are spaced apart from one another by non-illustrated, non-conductive webs.
  • the high-voltage electrodes 14 and 15 are embedded in the piston 7 in insulators 16 and 17, respectively.
  • the high-voltage electrode 14 is supplied with the necessary current via a power line 18, which runs inside the stamp 2.
  • the power line 18 is connected to a control device 19.
  • This control device 19 is again informed from a measuring device 20 via the positional state of the slide 2 so that its linear motion with regard to the prevailing clamping force and the penetration ⁇ or moving speed of the punch rivet 6 can be controlled.
  • the plunger 2 moves the piston downward within the hold-down device 1 as long as no high voltage is applied to the high-voltage electrodes 14 and 15, because at this point in time the viscosity of the electro-rheological liquid 10 flows freely through the annular channel 13 in the piston 7.
  • FIG. 2 shows a further embodiment of the device according to the invention, in which a magneto-rheological liquid 21 is used instead of an electro-rheological liquid.
  • the magneto-rheological fluid 21 is controlled via a magnetic field in order to influence its viscosity in a targeted manner. Accordingly, magnetic coils are used instead of high-voltage electrodes.
  • a magnet coil 22 as the one pole and a magnet coil 23 as the other pole are integrated in the wall of the hold-down device 1, all the way around it.
  • the magnet coils 22 and 23 are located essentially at the height of the piston 7.
  • a power line 24 supplies the magnet coils 22 and 23 with a current to be varied accordingly by the control device 19, on the basis of which the generated magnetic field also varies and thus the viscosity of the magneto-rheological fluid 21 actively influenced.
  • the magnet coils 22 and 23 are arranged inside the piston 7 and form the channel wall there, the power line 24 then being routed again inside the stamp 2.
  • FIGS. 1 to 3 can also be used for the method of clinching, in which the layers 4 and 5 are "punched" together directly by the punch 2 without using a joint element.
  • Fig. 4 shows this exemplarily for the device already described in connection with FIG. 1.
  • the supply of the high-voltage electrodes 14 and 15 or the magnetic coils 22 and 23 with voltages in the range of a few milliseconds can be varied, so that the clamping force exerted by the hold-down device 1 can also be varied inevitably.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Insertion Pins And Rivets (AREA)

Abstract

La présente invention concerne un dispositif pour produire un raccord d'assemblage à froid par liaison de forme entre des couches (4, 5) sur des pièces. Ce dispositif comprend une matrice (3) et un serre-flan (1), entre lesquels se trouvent les couches (4, 5), ainsi qu'un poinçon (2), guidé de manière axiale dans ledit serre-flan (1). Afin de créer une force de serrage, le serre-flan (1) peut être commandé à l'aide d'un liquide (10). La présente invention concerne un dispositif et un procédé permettant de modifier activement la viscosité et, ainsi, les propriétés d'écoulement du liquide (10), de façon à pouvoir faire varier de manière spécifique la force de serrage exercée par le serre-flan (1) sur les couches (4, 5).
PCT/DE2002/002668 2001-07-20 2002-07-19 Procede et dispositif pour produire un raccord d'assemblage a froid par liaison de forme WO2003013759A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001135488 DE10135488A1 (de) 2001-07-20 2001-07-20 Verfahren und Vorrichtung zur Herstellung einer formschlüssigen Kaltfügeverbindung
DE10135488.6 2001-07-20

Publications (1)

Publication Number Publication Date
WO2003013759A1 true WO2003013759A1 (fr) 2003-02-20

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PCT/DE2002/002668 WO2003013759A1 (fr) 2001-07-20 2002-07-19 Procede et dispositif pour produire un raccord d'assemblage a froid par liaison de forme

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Country Link
DE (1) DE10135488A1 (fr)
WO (1) WO2003013759A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10332124A1 (de) * 2003-07-15 2005-02-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zum Verbinden von plattenförmigen Bauteilen mit variabler Fügetechnik
WO2005049278A1 (fr) * 2003-11-21 2005-06-02 Hainbuch Gmbh Spannende Technik Machoire de serrage et dispositif de serrage pour fixer des pieces
DE102004015568A1 (de) * 2004-03-30 2005-10-27 Böllhoff Verbindungstechnik GmbH Kombiniertes Durchsetzfüge-Stanznietwerkzeug
DE102004058452A1 (de) * 2004-12-03 2006-06-08 Vacuumschmelze Gmbh & Co. Kg Stromerfassungseinrichtung und Verfahren zum Herstellen einer solchen Stromerfassungseinrichtung
WO2009122179A1 (fr) * 2008-04-03 2009-10-08 The University Of Nottingham Agencement d'engagement
CN102022472A (zh) * 2010-12-23 2011-04-20 上海应用技术学院 旋转型泡沫金属磁流变液阻尼器
EP2170538B1 (fr) * 2007-06-08 2012-08-15 EADS Deutschland GmbH Procédé de formage ainsi que lubrifiant magnétorhéologique et dispositif pour ce procédé
WO2014025608A1 (fr) * 2012-08-07 2014-02-13 Newfrey Llc Riveteuse
CN103758911A (zh) * 2014-01-27 2014-04-30 安徽柳工起重机有限公司 车辆磁流变油气悬架阻尼阀
CN108730399A (zh) * 2018-06-20 2018-11-02 安徽工程大学 减振系统
CN109307038A (zh) * 2018-12-12 2019-02-05 上海大学 一种基于巨电流变液剪切阀式的多层极板的阻尼器
WO2019038031A1 (fr) * 2017-08-22 2019-02-28 Bayerische Motoren Werke Aktiengesellschaft Boulon de pression d'une presse ainsi que presse pourvue d'un boulon de pression
CN109954830A (zh) * 2019-04-23 2019-07-02 沈阳航空航天大学 一种模块化电磁铆接枪

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993024258A1 (en) * 1992-06-04 1993-12-09 Ariel Industries Plc Fastener applicator with independent workpiece clamping and fastener driving
WO1994014554A1 (fr) * 1992-12-19 1994-07-07 Henrob Limited Ameliorations relatives au rivetage a perçage autonome
DE19735898A1 (de) * 1997-08-19 1999-02-25 Schenck Ag Carl Ventil und Stoßdämpfer auf Basis elektrorheologischer Flüssigkeiten
DE19752367A1 (de) * 1997-11-26 1999-05-27 Emhart Inc Verfahren und Vorrichtung zur Herstellung einer Stanznietverbindung
DE19805519C1 (de) * 1998-02-11 1999-07-29 Fraunhofer Ges Forschung Überlastsicherung für mechanische Pressen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993024258A1 (en) * 1992-06-04 1993-12-09 Ariel Industries Plc Fastener applicator with independent workpiece clamping and fastener driving
WO1994014554A1 (fr) * 1992-12-19 1994-07-07 Henrob Limited Ameliorations relatives au rivetage a perçage autonome
DE19735898A1 (de) * 1997-08-19 1999-02-25 Schenck Ag Carl Ventil und Stoßdämpfer auf Basis elektrorheologischer Flüssigkeiten
DE19752367A1 (de) * 1997-11-26 1999-05-27 Emhart Inc Verfahren und Vorrichtung zur Herstellung einer Stanznietverbindung
DE19805519C1 (de) * 1998-02-11 1999-07-29 Fraunhofer Ges Forschung Überlastsicherung für mechanische Pressen

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10332124B4 (de) * 2003-07-15 2005-08-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zum Verbinden von plattenförmigen Bauteilen mit variabler Fügetechnik
DE10332124A1 (de) * 2003-07-15 2005-02-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zum Verbinden von plattenförmigen Bauteilen mit variabler Fügetechnik
WO2005049278A1 (fr) * 2003-11-21 2005-06-02 Hainbuch Gmbh Spannende Technik Machoire de serrage et dispositif de serrage pour fixer des pieces
DE102004015568A1 (de) * 2004-03-30 2005-10-27 Böllhoff Verbindungstechnik GmbH Kombiniertes Durchsetzfüge-Stanznietwerkzeug
DE102004015568B4 (de) * 2004-03-30 2017-09-14 Böllhoff Verbindungstechnik GmbH Kombiniertes Durchsetzfüge-Stanznietwerkzeug
DE102004058452A1 (de) * 2004-12-03 2006-06-08 Vacuumschmelze Gmbh & Co. Kg Stromerfassungseinrichtung und Verfahren zum Herstellen einer solchen Stromerfassungseinrichtung
US7692526B2 (en) 2004-12-03 2010-04-06 Vacuumschmelze Gmbh & Co. Kg Inductive component and method for the manufacture of such a component
EP2170538B1 (fr) * 2007-06-08 2012-08-15 EADS Deutschland GmbH Procédé de formage ainsi que lubrifiant magnétorhéologique et dispositif pour ce procédé
WO2009122179A1 (fr) * 2008-04-03 2009-10-08 The University Of Nottingham Agencement d'engagement
CN102083590A (zh) * 2008-04-03 2011-06-01 诺丁汉大学 接合装置
CN102022472A (zh) * 2010-12-23 2011-04-20 上海应用技术学院 旋转型泡沫金属磁流变液阻尼器
US9027220B2 (en) 2012-08-07 2015-05-12 Newfrey Llc Rivet setting machine
CN104703722A (zh) * 2012-08-07 2015-06-10 纽弗雷公司 铆钉设置机器
WO2014025608A1 (fr) * 2012-08-07 2014-02-13 Newfrey Llc Riveteuse
CN103758911A (zh) * 2014-01-27 2014-04-30 安徽柳工起重机有限公司 车辆磁流变油气悬架阻尼阀
CN103758911B (zh) * 2014-01-27 2016-02-10 安徽柳工起重机有限公司 车辆磁流变油气悬架阻尼阀
WO2019038031A1 (fr) * 2017-08-22 2019-02-28 Bayerische Motoren Werke Aktiengesellschaft Boulon de pression d'une presse ainsi que presse pourvue d'un boulon de pression
US11479005B2 (en) 2017-08-22 2022-10-25 Bayerische Motoren Werke Aktiengesellschaft Pressure pin of a press and press having pressure pin
CN108730399A (zh) * 2018-06-20 2018-11-02 安徽工程大学 减振系统
CN108730399B (zh) * 2018-06-20 2023-04-18 安徽工程大学 减振系统
CN109307038A (zh) * 2018-12-12 2019-02-05 上海大学 一种基于巨电流变液剪切阀式的多层极板的阻尼器
CN109954830A (zh) * 2019-04-23 2019-07-02 沈阳航空航天大学 一种模块化电磁铆接枪

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