WO2002068139A2 - Procede permettant de creer un joint entre des elements en forme de feuille - Google Patents

Procede permettant de creer un joint entre des elements en forme de feuille

Info

Publication number
WO2002068139A2
WO2002068139A2 PCT/EP2002/002033 EP0202033W WO02068139A2 WO 2002068139 A2 WO2002068139 A2 WO 2002068139A2 EP 0202033 W EP0202033 W EP 0202033W WO 02068139 A2 WO02068139 A2 WO 02068139A2
Authority
WO
WIPO (PCT)
Prior art keywords
tools
members
sheet formed
piston
formed members
Prior art date
Application number
PCT/EP2002/002033
Other languages
English (en)
Other versions
WO2002068139A8 (fr
WO2002068139A1 (fr
WO2002068139A3 (fr
Inventor
Olivier Dubugnon
Original Assignee
Attexor Clinch Systems Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from SE0100667A external-priority patent/SE0100667D0/xx
Application filed by Attexor Clinch Systems Sa filed Critical Attexor Clinch Systems Sa
Priority to EP02727331A priority Critical patent/EP1381479A2/fr
Publication of WO2002068139A1 publication Critical patent/WO2002068139A1/fr
Publication of WO2002068139A2 publication Critical patent/WO2002068139A2/fr
Publication of WO2002068139A8 publication Critical patent/WO2002068139A8/fr
Publication of WO2002068139A3 publication Critical patent/WO2002068139A3/fr

Links

Definitions

  • This invention relates to a method for joining together two or several overlaying sheet formed members and an apparatus for carrying out said method.
  • the apparatuses or machines could be of stationary or hand-held type and the power source could e.g. be hydraulic or pneumatic.
  • a joint of this type could be made by means of drawing said sheet formed members into a cup-shaped or protruding portion having a cylindrical or slightly conical side wall and a bottom wall and subsequently compressing said bottom wall creating a lateral extrusion of the same thereby forming a laterally enlarged shape which mechanically interlocks the sheet formed members.
  • the machines used for making the joints provide very high forces especially at the end of the joining procedure during the lateral extrusion of the material when the workpiece is squeezed between a punch and a co-operating anvil.
  • the counter forces are taken up by a C-frame which could have considerable dimensions due to the fact that the pressure between the two cooperating tools could be in the range of several tons.
  • the methods and tools according to the prior art make use of the well known one or two step principles.
  • the single step method the whole procedure for making the joint takes place during one single relative movement between a punch and a co-operating die and anvil.
  • the final compression of the material takes place during a second squeezing operation outside the die cavity.
  • a percussion method is also known from the prior art. According to this method an oscillating hammer is making a series of impacts on a mandrel connected to the tool. The joint is resulting from a large number of impacts. This method is very noisy due to the repeated elastic impacts of the metal hammer on the metal mandrel.
  • One object of the present invention is to provide a method for making joints between sheet formed members which is much faster than prior art methods. To make a joint with the inventive method typically takes only one tenth of the time needed with prior art methods. A further object of the present invention is to provide a method which is generating much less noise than the known percussive method.
  • Another object of the invention is to provide a method and an apparatus which can make use of a less heavy C-frame than prior art methods.
  • a still further object is to provide a machine with very efficient damping of vibrations from the working process.
  • a still further object is to provide a machine which does not need a pressure booster for the operation. This means of course a considerable cost saving.
  • Figure 1 shows partly in section a first embodiment of a machine according to the invention in an initial position.
  • Figure 2 shows the machine according to figure 1 with the tools positioned for the active stroke.
  • Figure 3 shows the machine according to figure 1 after the active stroke.
  • Figure 4 shows partly in section a second embodiment of a machine according to the invention in an initial position.
  • Figure 5 shows the machine according to figure 4 after the active stroke.
  • Figure 6 shows partly in section a third embodiment of a machine according to the invention in an initial position.
  • Figure 7 shows the machine according to figure 6 with the tools positioned for the active stroke.
  • Figure 8 shows the machine according to figure 6 during and after the active stroke.
  • Figure 9 shows schematically a simple hydraulic drive system for the machine according to the invention.
  • Figure 10 shows schematically a simple pneumatic drive system for the machine according to the invention.
  • Figure 1 shows one example of a machine according to the invention generally designated 100.
  • the main parts are a C-frame 1 and an activation unit 2 mounted on said C-frame comprising a cylinder-piston assembly 3, 4, 5, 6.
  • the cylinder-piston assembly includes a pneumatic or hydraulic cylinder 3, a piston impactor 4 a second piston 5 and a piston rod 6 operated by said second piston 5.
  • the lower end of the piston rod constitutes a first tool holder.
  • the C-frame has two opposing, generally parallel, legs 7, 8 oriented horizontally in figure 1.
  • Said cylinder-piston assembly 3, 4, 5, 6 is in the example mounted on the upper leg 7 and a guiding part 9 for the piston rod 6 forming part of the cylinder-piston assembly reaches through a vertical hole in said leg.
  • the leg 8 constitutes a second tool holder.
  • a co-operating set of tools 10, 11 is arranged at the end of the piston rod 6 and the opposing leg 8 of the C-frame respectively.
  • These tools could for instance comprise a punch 10 and a die 11 for carrying out an operation on a workpiece.
  • the punch and the die could of course also be arranged in the reverse positions.
  • a workpiece, in this example illustrated comprising two superimposed pieces of sheet material 12, 13, have been placed on top of the die. It should be understood that more than two sheets could be joined by means of the same method and apparatus and that the material of the workpiece does not necessarily have to metallic.
  • a fluid e.g. air or oil
  • a fluid is released through the outlet 14 from a chamber 15 in the cylinder 3 under the piston 5.
  • a spring 16 arranged between the piston impactor 4 which is positioned at the upper part of the cylinder and the second piston 5 said piston 5 and the piston rod 6 will move downwards until contact between the punch 10, or a sidepressing element 17 arranged around the punch, and the upper sheet 12.
  • FIG 2 This position is shown in figure 2. It should be noted that no operation has yet been carried out on the workpiece. The machine has only been positioned for the active stroke.
  • a second spring 18 between the piston 5 and the end portion of the cylinder. This spring could be of interest in certain embodiments.
  • the upper end of the cylinder piston assembly 2 is provided with an inlet 19 for a fluid e.g. air or oil.
  • a fluid e.g. air or oil.
  • the piston 4 When a high pressure fluid is entering the inlet 19 the piston 4 will be accelerated against the force from the spring 16 and will hit the upper surface of the piston 5.
  • the energy from the impact will be transferred through the piston rod 6 to the punch 10 which in co-operation with the die 11 will deform the workpiece, i.e. the two sheet formed members 12 and 13. In this way a joint could e.g. be created between the two members.
  • Figure 4 shows a second embodiment of the machine according to the invention generally designated 200.
  • the activation unit is in this case only comprising one piston 20.
  • This piston could be brought to its starting position at the top of the cylinder 3 by means of e.g. pneumatic pressure as shown in figure 4 or by means of the force from a spring arranged in the cylinder.
  • high pressure fluid to the inlet 19 will accelerate the piston 20 downwards in the direction of the workpiece 12, 13.
  • the operation on the workpiece will be carried out at the end of this single stroke, cf. figure 5.
  • a protection in the form of a coaxial tube could be arranged around the piston rod 6 as shown in figure 6.
  • This protection arrangement could be fixed as shown in figure 6 or have the form of a sliding tube e.g. activated from the activation unit 2. Such a tube could also be arranged to guide the piston rod and the associated tool against the impact point. An arrangement like the one shown in figure 6 will also considerably reduce the noise as the impact zone is completely surrounded by the tube.
  • the speed of the piston and thus the energy of the impact will be controlled by means of the pressure and volume of the fluid through the inlet 19.
  • the end of the stroke could also be made adjustable e.g. by means of the position of the guiding part 9 relative to the cylinder 3.
  • Figure 6 shows a further embodiment of the invention. It differs from the embodiment according to figures 4 and 5 mainly in the arrangement of the C- frame.
  • the C-frame 1 is here provided with an articulation so that the lower leg 8 can pivot around a pivot joint 21.
  • the articulation is preferably arranged in the plane perpendicular to the axis of the motion of the piston rod 6 and in which the impact deformation of the workpiece will be created.
  • the C-frame In the initial or start position shown in figure 6 the C-frame is open in order to allow the workpiece to be positioned for the stroke.
  • the piston 20 is kept in its starting position by means of the pressure in the chamber 15 or a spring (not shown).
  • a protection in the form of a tube 22 is arranged around the moving tool 10.
  • This tube 22 has in this case also the function as a positioning item for the workpiece 12, 13.
  • a pneumatic or hydraulic cylinder-piston assembly 23 is schematically illustrated arranged between the fixed and the pivoting part of the C-frame. By feeding/releasing a working fluid to opposite sides of the piston in this assembly 23 through the in- and outlets 23' and 23" the length could be adjusted and thereby the position of the lower leg 8 of the C-frame.
  • the piston 20 will be brought back to its starting position by means of a pressurised fluid entering the inlet-outlet 14 or by means of a spring (not shown) arranged between the guiding element 9 and the piston 20.
  • FIG 9 shows schematically a simple hydraulic drive system for the machine according to the invention. Only the system for actuating the piston 4 is illustrated.
  • a pump 24 is pumping oil from a reservoir 25 through a regulator 26 to an accumulator 27.
  • a fast action valve 28 can be activated by means of a trigger 29 connecting the accumulator 27 to the inlet 19 of the cylinder 3. In the initial (rest position) the valve 28 connects the volume on top of the piston 4 through a return conduit 30 to the oil reservoir 25.
  • the regulator is setting the pressure in the accumulator 27. This accumulator will assure that there is enough oil of the set pressure available for the stroke of the piston 4.
  • FIG. 10 shows schematically a simple pneumatic drive system for the machine according to the invention.
  • Inlet 31 is connected to a source of compressed air, e.g. the standard distribution network of 6 bars in the workshop.
  • An accumulator/reservoir 32 is connected between the inlet 31 and a fast acting valve of the same type as described in figure 9.

Abstract

L'invention concerne un procédé permettant de créer des joints entre des éléments en forme de feuille superposés, un agencement sensiblement coaxial d'outils (10, 11) étant contraints de coopérer au moyen de leur mouvement relatif, l'un en direction de l'autre et les éléments en forme de feuilles superposés (12, 13) étant placés, avant l'opération, entre les outils (10, 11). L'ensemble de l'opération réalisée sur les éléments en forme de feuille, aux fins de création du joint, est effectuée au moyen d'un coup unique d'un des outils (10, 11) contre l'autre et l'énergie nécessaire à la réalisation du joint se présente sous forme d'énergie cinétique d'une masse accélérée, en contact avec un des outils. Dans un mode de réalisation, un des outils (10, 11) est soumis à une accélération conjointement avec la masse contre l'autre outil. Dans un autre mode de réalisation, les outils (10, 11) sont positionnés, dans un premier temps, sur chaque côté des éléments, de manière à être en contact ou presque en contact avec les éléments, avant l'exécution de l'opération sur les éléments et la masse accélérée est amenée à l'impact sur un des outils ou le support de l'outil associé.
PCT/EP2002/002033 2001-02-26 2002-02-26 Procede permettant de creer un joint entre des elements en forme de feuille WO2002068139A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02727331A EP1381479A2 (fr) 2001-02-26 2002-02-26 Procede permettant de creer un joint entre des elements en forme de feuille

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0100667A SE0100667D0 (sv) 2001-02-26 2001-02-26 A method for making joints between sheet formed members and an apparatus for carrying out said method
SE0100667-5 2001-02-26

Publications (4)

Publication Number Publication Date
WO2002068139A1 WO2002068139A1 (fr) 2002-09-06
WO2002068139A2 true WO2002068139A2 (fr) 2002-09-06
WO2002068139A8 WO2002068139A8 (fr) 2002-10-10
WO2002068139A3 WO2002068139A3 (fr) 2003-08-28

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