WO2003078102A1 - Dispositif de surete pour machine effectuant une operation du type a ecrasement sur une piece mecanique a usiner - Google Patents

Dispositif de surete pour machine effectuant une operation du type a ecrasement sur une piece mecanique a usiner Download PDF

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Publication number
WO2003078102A1
WO2003078102A1 PCT/EP2003/002887 EP0302887W WO03078102A1 WO 2003078102 A1 WO2003078102 A1 WO 2003078102A1 EP 0302887 W EP0302887 W EP 0302887W WO 03078102 A1 WO03078102 A1 WO 03078102A1
Authority
WO
WIPO (PCT)
Prior art keywords
rear end
end portions
actuator
head
jaw
Prior art date
Application number
PCT/EP2003/002887
Other languages
English (en)
Inventor
Olivier Dubugnon
Original Assignee
Attexor Clinch Systems S.A.
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 Attexor Clinch Systems S.A. filed Critical Attexor Clinch Systems S.A.
Publication of WO2003078102A1 publication Critical patent/WO2003078102A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • 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
    • 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
    • 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
    • B21J15/18—Drives for riveting machines; Transmission means therefor operated by air pressure or other gas pressure, e.g. explosion 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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426—Fixtures for other work
    • B23K37/0435—Clamps

Definitions

  • This invention relates to apparatuses for carrying out operations on a mechanical workpiece e.g. tools or machines for pressing, riveting, clinching, cutting, welding, spot-welding etc. More particularly, the invention relates to a safety arrangement for such machines.
  • the tools and machines could be of stationary or hand-held type.
  • the power source could be of any type, hydraulic, pneumatic, electric, of manual type etc.
  • a machine typically makes one or several "strokes" (tool elements are approaching each other from opposite sides of the workpiece) towards the workpiece in order to achieve the expected effect.
  • the opening between the active machine elements, for introducing the workpieces can be decreased in a first part of the stroke, the approach stroke, before the second active part of the stroke takes place.
  • very high forces are typically applied (squeezing).
  • An apparatus or machine of this type could be exemplified by an apparatus for joining sheet formed members together by means of a technique usually called clinching, thereby producing leakproof or non-leakproof joints between the sheet formed members.
  • 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 clinching 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 co-operating tools could be in the range of several tons.
  • One object of the present invention is to provide a safety arrangement for an apparatus for carrying out a squeezing type of operation on a mechanical workpiece which arrangement is completely mechanical and thus more robust and safer than arrangements according to the prior art.
  • Another object of the present invention is to provide a safety arrangement which can be used on machines having articulated C-frames as well as on machines with fixed C-frame.
  • Figure 1 shows in a schematic view, partly in section a hand held machine for squeezing type of operation on a mechanical workpiece.
  • Figures 2a-c show in a schematic view, a detail of the machine according to figure 1.
  • FIG. 3 shows in a schematic view, the detail according to figures 2a-c from above.
  • Figures 4a - d show in a schematic view, a second embodiment of the detail according to figures 2a-c.
  • Figure 3 shows in a schematic view, an implementation of the inventive idea on a machine having a fixed C-frame.
  • Figure 6 shows in a schematic view, a detail of the machine according to figure 5.
  • Figure 1 shows in a schematic view, partly in section a hand held machine, generally designated 1 , for squeezing type of operation on a mechanical workpiece (not shown).
  • the C-frame in this example is articulated and comprises two parts or jaws 2 and 3 arranged pivoting in relation to each other around the pivoting point 4. Suitable toolheads (not shown) are fixed on the left end-portions 5 and 6 of the jaws 2 and 3, respectively. The workpiece is to be entered between these end- portions 5 and 6.
  • the rear end-portions 7 and 8 of the pivoting parts 2 and 3, respectively, are provided in this example with rollers 9 - 11 , cf. below.
  • the lower part 3 is in this example fixed to the rest of the machine.
  • the right hand part of the machine comprises the actuator 12 for the active part of the stroke (the power stroke).
  • this actuator comprises a pneumatic cylinder-piston assembly 13, 14 but other types of motors could be envisaged like electrical or hydraulic motors etc..
  • the piston is provided with a piston rod 16 and a return spring 17.
  • the chamber 18 has in- and outlets for the air (not shown).
  • the machine is of course connected to a power and control system of some common type, not shown.
  • the end portion of the piston rod 16 opposite the piston 14 is provided with an actuator head 9 having a surface 21 parallel to the axis of the piston rod and an inclined surface 20.
  • the middle portion of the machine forms the grip which suitably is provided with a trigger for the power stroke.
  • a typical machine of this type has a weight of a few kilos. To make it easier for the operator the machine is therefore usually suspended in a ring 22 arranged on a ballbearing on the outside of the house of the machine close to a plane through the center of gravity for the assembly.
  • the piston 14 In the starting position the piston 14 is positioned to the right in the figure. This means that the upper jaw 2 is freely movable around the pivoting point 4 and the workpiece can be entered in the gap between the toolheads at 5 and 6 in the figure.
  • the toolheads are now approached towards each other by pivoting the jaw 2. This movement can be carried out manually as in the present case or be assisted or fully achieved by means of some suitable motor.
  • the actuator 12 When the jaw 2 has been brought into position the actuator 12 is activated. Air enters the chamber 18 and the piston 14 moves to the left in the figure which means that the actuator head 19 enters between the two lower rollers 10, 11 and the upper roller 9. The surface 21 on the lower side of the actuator head will be supported by the two rollers 10, 11 in the axial movement to the left and the upper inclined surface 20 will gradually increase the pressure on the roller 9 and thereby force the upper jaw to pivot counter clockwise in the figure. The linear movement of the actuator head is in this way translated into a pivoting movement of the jaw 2 with considerable force. So far no safety arrangements have been shown or described.
  • actuator head 19 in another embodiment could be provided with a roller and the inclined surface could be arranged on the pivoting jaw 2.
  • Figures 2a-c show in a schematic view, a detail of the machine according to figure 1.
  • FIG 2a the rear end portions 7 and 8 of the jaws 2 and 3, respectively, are shown in a position in which the machine is fully open ready for positioning of the workpiece.
  • a lateral blocking plate 24 On each side of the roller 9 on the jaw 2 are arranged a lateral blocking plate 24, e.g. fixed to the outside of jaw by means of screws 25, cf. figure 3.
  • the rear part of these blocking plates 24 has in this embodiment a cylindrical surface 26 with the center axis coinciding with the pivoting axis through the pivoting point 4 and the radius R.
  • the actuator head 19 has been provided with lateral wings or sideplates 23, also shown in figure 3, arranged on the two sides of the head in a plane parallel to the pivoting axis and the piston rod 16.
  • the front end of these wings 23 has in this embodiment the form of a flat surface 27 perpendicular to the axis of the linear movement of the head, i.e. vertical in figure 2a-c.
  • the actuator 12 is trigged when the jaws 2 and 3 are in the position shown in figure 2a, i.e. the machine is not yet ready for the power stroke, the head 19 will move to the left in the figure until it reaches the illustrated position.
  • the surface 27 of the sideplates 23 will in this position contact the two blocking plates 24 without touching the roller 9, cf. figure 3,
  • Figure 2b illustrates the situation in which the approach stroke has been started but has not yet been finalised. During this stroke the head 19 is not in contact with the jaw 2. Once again, if by mistake the actuator 12 is triggered the head 19 will move to the left until the position illustrated in figure 2b. As described in relation to figure 2a there will still be no resulting pivoting force transferred to the jaw 2, thus no risk for injuries or damages.
  • Figures 4a - d show in a schematic view, a second embodiment of the detail according to figures 2a-c.
  • the only difference between this embodiment and the one shown in figures 2a-c and figure 3 refers to the design of the blocking plates 24'.
  • the contact surface 26' has in this embodiment three different zones 30, 31 , 32 and two intermediate zones 33 and 34.
  • the zone 30 has the same characteristics as the surface 26 of the previous embodiment. This means that in the situation illustrated in figure 4a there will be no resulting pivoting force on the jaw 2.
  • the zone 31 has in the shown example been designed so that the contact line between the surface 27 on the side plate 23 of the head 19 and the blocking plate has moved down, as illustrated by the opposing arrows in figure 4b, and is situated below the horizontal plane through the pivoting axis. This has been achieved by lowering the center of curvature for this zone. As a result there will be a net force transferred to the jaw 2 when the head is pressing against the jaw which force is trying to rotate the jaw clockwise in the figure 4b. Due to the friction this will not be possible and in any case such a movement would be blocked when the intermediate zone 33 is contacting the upper surface of the side plate 23. Thus, in this case too the safety arrangement works. There is no risk that the jaws will close around the workpiece.
  • Figure 4c is illustrating the same thing for the contact with zone 32 with the same effect.
  • Figure 4d finally is illustrating the same situation as figure 2c.
  • zones 31 and 32 could also have the same form as the surface 26 and 26', i.e. cylindrical but with smaller radii than R. In that case the contact between the surfaces will take place at the interface between the zones 31 and 33 and 32 and 34, respectively. Under all circumstances the dangerous anti-clockwise rotation of the jaw 2 will be prevented.
  • Figures 5 and 6 show in different views, in schematic form, an implementation of the inventive idea on a machine having a fixed C-frame.
  • the linear movement of the actuator head 19' is in this case not transferred to a pivoting movement of a jaw but to a perpendicular movement of a toolcarrying frame 36.
  • the actuator 12' is of the same type as described above. It can as before, as an alternative, be constituted by an electrical or a hydraulic motor.
  • the head 19' is in the same way as before provided with wings 23'.
  • the approach stroke corresponds to a linear vertical movement of the frame 36. This movement can be carried out manually or as in the embodiment according to the figures 5 and 6 be actuated by e.g. a small pneumatic cylinder-piston assembly 35.
  • the frame 36 is provided with a window 37 which only will let the head 19' pass when the machine is positioned for the power stroke.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

Cette invention a trait à un dispositif de sécurité pour machine effectuant une opération du type à écrasement sur une pièce mécanique à usiner. Cette machine possède deux mâchoires (2, 3) ayant, chacune, une partie antérieure (5, 6) et une partie postérieure (7, 8) montées mutuellement pivotantes autour d'un pivot (4) placé entre elles, un actionneur (12) destiné à imprimer un mouvement linéaire à une tête (19) en direction des parties postérieures (7, 8) avec lesquelles elle entre en contact, afin de séparer ces parties postérieures, ce qui provoque la mise en écrasement entre les parties antérieures (5, 6). L'une au moins de ces parties postérieures est pourvue de plaques latérales d'immobilisation (24) et la tête de l'actionneur (19) est pourvue de platines latérales (23) disposées à la perpendiculaire des plaques d'immobilisation et conçues pour coopérer avec celles-ci, de façon que cette tête d'actionneur (19) puisse seulement pénétrer entre lesdites parties postérieures (7, 8) lorsque la machine est en position de temps moteur.
PCT/EP2003/002887 2002-03-19 2003-03-19 Dispositif de surete pour machine effectuant une operation du type a ecrasement sur une piece mecanique a usiner WO2003078102A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0200862-1 2002-03-19
SE0200862A SE0200862D0 (sv) 2002-03-19 2002-03-19 Safety arrangement for an apparatus for carrying out a squeezing type of operation on a mechanical workpiece

Publications (1)

Publication Number Publication Date
WO2003078102A1 true WO2003078102A1 (fr) 2003-09-25

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PCT/EP2003/002887 WO2003078102A1 (fr) 2002-03-19 2003-03-19 Dispositif de surete pour machine effectuant une operation du type a ecrasement sur une piece mecanique a usiner

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SE (1) SE0200862D0 (fr)
WO (1) WO2003078102A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2796245A1 (fr) * 2013-04-23 2014-10-29 Geberit International AG Outil de presse
FR3016310A1 (fr) * 2014-01-13 2015-07-17 Jean Claude Chabod Agencement d'un dispositif de serrage a machoires et came a grande ouverture avec course d'approche securisee
CN105500278A (zh) * 2016-01-05 2016-04-20 艾默生管道工具(上海)有限公司 液压工具

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19631019A1 (de) * 1996-02-09 1997-08-14 Novopress Gmbh Preßgerät
EP1103349A2 (fr) * 1999-11-24 2001-05-30 Von Arx Ag Outil de pressage et méthode de commande dudit outil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19631019A1 (de) * 1996-02-09 1997-08-14 Novopress Gmbh Preßgerät
EP1103349A2 (fr) * 1999-11-24 2001-05-30 Von Arx Ag Outil de pressage et méthode de commande dudit outil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2796245A1 (fr) * 2013-04-23 2014-10-29 Geberit International AG Outil de presse
FR3016310A1 (fr) * 2014-01-13 2015-07-17 Jean Claude Chabod Agencement d'un dispositif de serrage a machoires et came a grande ouverture avec course d'approche securisee
CN105500278A (zh) * 2016-01-05 2016-04-20 艾默生管道工具(上海)有限公司 液压工具
CN105500278B (zh) * 2016-01-05 2017-08-15 艾默生管道工具(上海)有限公司 液压工具

Also Published As

Publication number Publication date
SE0200862D0 (sv) 2002-03-19

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