EP3181343B1 - Dispositif d'actionnement hydraulique destiné à une presse - Google Patents

Dispositif d'actionnement hydraulique destiné à une presse Download PDF

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Publication number
EP3181343B1
EP3181343B1 EP16382532.6A EP16382532A EP3181343B1 EP 3181343 B1 EP3181343 B1 EP 3181343B1 EP 16382532 A EP16382532 A EP 16382532A EP 3181343 B1 EP3181343 B1 EP 3181343B1
Authority
EP
European Patent Office
Prior art keywords
rod
hydraulic actuator
chamber
actuating
cylinder
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.)
Not-in-force
Application number
EP16382532.6A
Other languages
German (de)
English (en)
Other versions
EP3181343A1 (fr
Inventor
Luis DEL TESO DÍEZ
Kepa ARAMBARRI ARREGUI
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.)
Nitrogas S A U
Nitrogas Sau
Original Assignee
Nitrogas S A U
Nitrogas Sau
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 Nitrogas S A U, Nitrogas Sau filed Critical Nitrogas S A U
Publication of EP3181343A1 publication Critical patent/EP3181343A1/fr
Application granted granted Critical
Publication of EP3181343B1 publication Critical patent/EP3181343B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/007—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen using a fluid connection between the drive means and the press ram
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
    • B30B15/282—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices using a breakage element
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/007—Overload

Definitions

  • the present invention relates to press-driven folding units or transverse punching units.
  • assemblies comprising at least two hydraulic cylinders along with presses has become increasingly widespread due to their flexibility.
  • Assemblies of this type comprise a vertical cylinder which is actuated by a moving part of a press (generally an upper die fixed to the press), causing the vertical movement of a rod of said cylinder with said actuation.
  • This movement in turn causes actuation of a second cylinder of the assembly which is fluidically communicated with the former.
  • the second cylinder causes actuation of a specific tool to perform the desired operation.
  • Patent document EP1057550A2 discloses an actuator of this type, said actuator comprising a hydraulic assembly with two fluidically communicated cylinders.
  • the first hydraulic cylinder comprises a fixed casing and a rod which moves between a passive position and an active position, as a result of the actuation of the moving part.
  • the hydraulic cylinder comprises a first chamber with a fluid therein delimited between the rod and the casing, and the rod is formed by a sleeve receiving the blow from the press, a piston, and a second chamber defined between the piston and the sleeve and comprising therein a fluid at a specific pressure.
  • This pressure is used for calibrating the maximum external force the cylinder supports (cylinder rating), such that the piston moves towards the press only if the pressure of the fluid in the first chamber exceeds the pressure of the fluid in the second chamber.
  • the cylinder itself thereby comprises a safety mechanism which prevents it from breaking down when it supports an external force exceeding its rated maximum force (at least for a small margin).
  • the object of the invention is to provide a hydraulic actuating device for a press, as described below.
  • the hydraulic actuating device of the invention is adapted for use in presses.
  • the device comprises a hydraulic actuator, a working cylinder and a conduit fluidically communicating the hydraulic actuator and the working cylinder to one another.
  • the hydraulic actuator comprises a casing, a rod which moves between a passive position and an active position, and a chamber delimited between the rod and the casing
  • the working cylinder comprises a casing, a rod which moves between a passive position and an active position, and a chamber delimited between the rod and the casing.
  • the conduit fluidically communicates the chamber of the hydraulic actuator with the chamber of the working cylinder.
  • the device further comprises an actuating cylinder adapted for being fixed to a moving part of the press, specifically to an upper die that is fixed to the press, such that when fixed to the press it acts on the rod of the hydraulic actuator as a result of the movement of the moving part towards the hydraulic actuator.
  • the actuating cylinder comprises an interchangeable actuating element arranged facing the rod of the hydraulic actuator when said actuating cylinder is fixed to the moving part of the press.
  • Said actuating element comprises a weakening area rated at a specific maximum force, such that when the press, through the moving part, causes the actuating cylinder to act on the hydraulic actuator with a force equal to or greater than said specific maximum force of the weakening area, said weakening area breaks, the external force to be supported by the hydraulic actuator being at least partially reduced.
  • Figure 1 shows an embodiment of the hydraulic actuating device of the invention.
  • the device comprises a hydraulic actuator 1, a working cylinder 2 and a conduit 3 fluidically communicating the hydraulic actuator 1 with the working cylinder 2, forming a hydraulic assembly 9.
  • the hydraulic actuator 1 comprises a casing 10, a rod 11 which can be moved between a passive position shown in said Figure 2 and an active position (representing the maximum movement of said rod 11 in a direction of movement Y1), and a chamber 12 delimited between the rod 11 and the casing 10.
  • the rod 11 is arranged facing a moving part 1001 of a press, such that when the moving part 1001 moves towards the hydraulic actuator 1 it acts on the rod 11, causing the movement thereof from the passive position towards the active position.
  • the hydraulic actuator 1 is preferably arranged in a vertical position (the rod 11 is arranged vertically, the direction of movement Y1 being vertical), facing the moving part 1001 of the press.
  • the working cylinder 2 in turn comprises a casing 20, a rod 21 which can be moved between a passive position shown in said Figure 2 and an active position (representing the maximum movement of said rod in a direction of movement X), and a chamber 22 delimited between the rod 21 and the casing 20.
  • the working cylinder 2 is preferably arranged in a horizontal position, perpendicular to the hydraulic actuator 1 (the rod 21 is arranged horizontally, the direction of movement X being horizontal).
  • the conduit 3 fluidically communicates the chamber 12 of the hydraulic actuator 1 with the chamber 22 of the working cylinder 2.
  • the hydraulic actuator 1 and the working cylinder 2, as well as the conduit 3, can be housed in one and the same body 90, forming the hydraulic assembly 9.
  • the moving part 1001 preferably is an upper die that is fixed to the press, and the hydraulic assembly 9 is fixed to a corresponding lower die that is also fixed in the press and not depicted in the drawings.
  • the moving part 1001 moves both ways in an actuating direction Y2 towards the hydraulic actuator 1 and away from the hydraulic actuator 1 during its normal operation, and when it is moved towards the hydraulic actuator 1, it pushes the rod 11 of said hydraulic actuator 1. Said pushing causes the movement of said rod 11 in a direction of movement Y1, and with said movement the rod 11 in turn pushes the fluid present in the chamber 12. Said fluid in turn pushes the rod 21 of the working cylinder 2, as a result of the conduit 3, such that said rod 21 moves in the direction of movement X when it is pushed by said fluid.
  • said rod 21 moves in the direction of movement X, said rod 21 causes the required final actuation (punching a sheet facing the rod 21, for example, by means of an appropriate tool 8 fixed to an end of said rod 21).
  • the moving part 1001 moves away from the hydraulic actuator 1, the fluid tends to return to its original position, causing the movement of the rods 11 and 21 in directions opposite to Y1 and X, respectively.
  • the pressure of the chamber 12 increases as the rod 11 moves.
  • the movement of the moving part 1001 is controlled so that it does not cause movements of the rod 11 which cause a specific pressure in said chamber 12 to be exceeded, but sometimes a movement of the rod 11 that causes higher pressures in said chamber 12 is caused accidentally (for example, by an erroneous control of the movement of the moving part 1001, lack of control of the movement thereof or the unintentional omission of an element, such as a tool, for example, between the hydraulic actuator 1 and the moving part 1001). If this occurs, the hydraulic actuator 1 can be irreversibly damaged, and more serious still, can even explode causing major damage to the surroundings (and to the people in the surroundings). To prevent this situation, the hydraulic actuator 1 usually has an integrated safety mechanism. Said mechanism involves rating the external force to be supported by the hydraulic actuator 1, which causes a higher pressure in the chamber 12. Said hydraulic actuator 1 is therefore provided with an additional travel margin, and said hydraulic actuator 1 is capable of absorbing excess external force.
  • the device of the invention comprises an actuating cylinder 4 adapted for being fixed to the moving part 1001 of the press, such that when it is fixed to the moving part 1001, said actuating cylinder 4 acts against the rod 11 of the hydraulic actuator 1 as a result of a movement of said moving part 1001 towards said hydraulic actuator 1.
  • the moving part 1001 preferably comprises a housing for housing the actuating cylinder 4 at least partially when said actuating cylinder 4 is fixed to said moving part 1001.
  • the actuating cylinder 4 comprises an interchangeable actuating element 43 which is arranged facing said rod 11 when the actuating cylinder 4 is fixed to the moving part 1001, and said actuating element 43 comprises a weakening area 43a rated at a specific maximum force (it supports, at most, said force before breaking).
  • the specific maximum force is set depending on the maximum working force allowable for the device.
  • the hydraulic cylinder 1 will be affected, but in other circumstances like those mentioned above, for example, the margin obtained as a result of the actuating cylinder 4 may be enough to assure that the hydraulic actuator 1 does not break. Furthermore, despite having added an actuating cylinder 4, said actuating cylinder 4 is not excessively affected either, since in these cases only the actuating element 43 itself breaks. Said actuating element 43 is interchangeable, such that the correct operation of the device can be recovered by simply replacing the broken element 43 with another element in good condition. The maintenance cost is therefore very low compared to cases in which the hydraulic actuator 1 must be replaced, for example.
  • the actuating cylinder 4 can be incorporated in devices comprised in hydraulic assemblies 9 without the additional integrated mechanism, or even in devices comprised in hydraulic assemblies 9 with the safety mechanism integrated in the hydraulic actuator 1.
  • the actuating element 43 is hollow, the minimum width 43b of the solid surrounding the hollow defining the weakening area 43a.
  • the actuating element 43 is substantially cylindrical and hollow, said hollow comprising a homogenous width (although it may not be a homogeneous width).
  • the thickness of the actuating element 43 decreases (the width of the solid surrounding the hollow decreases or the width of the cavity increases), the area of the actuating element 43 comprising a smaller thickness being the weakening area 43a.
  • the actuating cylinder 4 comprises a sleeve 40 adapted for being fixed to the moving part 1001 of the press, an attachment piece 44 fixed to the sleeve 40 and adapted for being fixed to the moving part 1001 of the press, the sleeve 40 being attached to said moving part 1001 by means of said attachment piece 44, and a rod 41 movable with respect to said sleeve 40, between a passive position and an active position, and projecting from the sleeve 40.
  • the actuating element 43 is attached to the end of the rod 41 projecting from the sleeve 40, such that said actuating element 43 contacts the rod 11 and pushes it, causing the movement of the rod 21 in the actuating direction X, as explained above.
  • the actuating cylinder 4 can further comprise an additional safety mechanism.
  • Said actuating cylinder 4 can comprise an additional rod 41', a first chamber 42' delimited between both rods 41 and 41', and a second chamber 44' delimited between the additional rod 41' and the sleeve 40.
  • first the rods 41 and 41' move in response compressing the second chamber 44'.
  • the pressure of the fluid in the second chamber 44' reaches the rated limit pressure of said second chamber 44', said pressure exceeds the pressure of the fluid in the first chamber 42' and the rod 41 moves towards the additional rod 41', the first chamber 42' being compressed.
  • both pressures become leveled off, the first rod 41 stops moving, and the weakening area 43a is designed to break at that time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (9)

  1. Dispositif d'actionnement hydraulique pour une presse, comprenant un actionneur hydraulique (1), un cylindre de travail (2) et un conduit (3) faisant communiquer fluidiquement avec l'actionneur hydraulique (1) et le cylindre de travail (2), l'actionneur hydraulique (1) comprenant un carter (10), une tige (11) qui se déplace entre une position passive et une position active et une chambre (12) délimitée entre la tige (11) et le carter (10), le cylindre de travail (2) comprenant un carter (20), une tige (21) qui se déplace entre une position passive et une position active et une chambre (22) délimitée entre la tige (21) et le carter (20) et le conduit (3) faisant communiquer fluidiquement la chambre (12) de l'actionneur hydraulique (1) et la chambre (22) du cylindre de travail (2), caractérisé en ce que le dispositif comprend en outre un vérin d'actionnement (4) adapté pour être fixé à une partie mobile (1001) de la presse, de sorte que lorsqu'il est fixé à la partie mobile (1001), il agisse sur la tige (11) de l'actionneur hydraulique (1) du fait du mouvement de ladite partie mobile (1001) vers l'actionneur hydraulique (1), le vérin d'actionnement (4) comprenant un élément d'actionnement interchangeable (43) disposé en face de la tige (11) de l'actionneur hydraulique (1) lorsque ledit vérin d'actionnement (4) est fixé à la partie mobile (1001) et ledit élément d'actionnement (43) comprenant une zone d'affaiblissement (43a) évaluée à une pression maximale spécifique, telle que lorsque la partie mobile (1001) amène le vérin d'actionnement (4) à agir sur l'actionneur hydraulique (1) avec une pression supérieure ou égale à la pression maximale déterminée spécifique de la zone d'affaiblissement (43a), ladite zone d'affaiblissement (43a) casse, la pression devant être supportée par l'actionneur hydraulique (1) étant réduite.
  2. Dispositif selon la revendication 1, dans lequel la zone d'affaiblissement (43a) est évaluée en dessous de la pression maximale nominale de l'actionneur hydraulique (1).
  3. Dispositif selon les revendications 1 ou 2, dans lequel l'élément d'actionnement (43) est creux, la largeur de la cavité définissant la zone d'affaiblissement (43a).
  4. Dispositif selon la revendication 3, dans lequel, dans la zone d'affaiblissement (43a), la partie de l'élément d'actionnement (43) entourant la cavité dudit élément d'actionnement (43) présente une largeur inférieure à celle du reste de l'élément d'actionnement (43) entourant ladite cavité, de sorte que l'élément d'actionnement (43) ait une épaisseur plus petite (43b) dans ladite zone d'affaiblissement (43a).
  5. Dispositif selon la revendication 3, dans lequel, dans la zone d'affaiblissement (43a), la cavité présente une largeur plus grande que dans le reste, de sorte que l'élément d'actionnement (43) ait une épaisseur plus faible (43b) dans ladite zone d'affaiblissement (43a).
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le vérin d'actionnement (4) comprend un manchon (40) adapté pour être fixé à la partie mobile (1001) de la presse et une tige (41) mobile par rapport audit manchon (40) entre une position passive et une position active, faisant saillie depuis le manchon (40), l'élément d'actionnement (43) étant fixé à l'extrémité de la tige (41) faisant saillie depuis ledit manchon (40), ledit élément d'actionnement (43) faisant saillie depuis ladite tige (41).
  7. Dispositif selon la revendication 6, dans lequel le vérin d'actionnement (4) comprend une pièce de fixation (44) fixée au manchon (40) et adaptée pour être fixée à la partie mobile (1001) de la presse, le manchon (40) étant fixé à ladite partie mobile (1001) au moyen de ladite pièce de fixation (44).
  8. Dispositif selon la revendication 6 ou 7, dans lequel le vérin d'actionnement (4) comprend une tige supplémentaire (41'), une première chambre (42') délimitée entre les deux tiges (41, 41') du vérin d'actionnement (4) et une seconde chambre (44') délimitée entre la tige supplémentaire (41') et le manchon (40).
  9. Dispositif selon la revendication 8, dans lequel les deux chambres (42', 44') du cylindre d'actionnement (4) comprennent un fluide en leur sein, la seconde chambre (44') étant évaluée à une pression inférieure à celle de la première chambre (42') et ladite première chambre (42') étant évaluée à une pression inférieure à celle de la zone d'affaiblissement (43a).
EP16382532.6A 2015-12-14 2016-11-15 Dispositif d'actionnement hydraulique destiné à une presse Not-in-force EP3181343B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201531799 2015-12-14

Publications (2)

Publication Number Publication Date
EP3181343A1 EP3181343A1 (fr) 2017-06-21
EP3181343B1 true EP3181343B1 (fr) 2018-09-05

Family

ID=57394510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16382532.6A Not-in-force EP3181343B1 (fr) 2015-12-14 2016-11-15 Dispositif d'actionnement hydraulique destiné à une presse

Country Status (2)

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EP (1) EP3181343B1 (fr)
ES (1) ES2686989T3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1101328B (de) * 1960-02-12 1961-03-09 Moeller & Neumann Gmbh UEberlastsicherung mit einem auswechselbaren Brechglied zwischen auf Druck belasteten Maschinenteilen
BE630697A (fr) * 1963-04-12
US5606910A (en) * 1993-04-26 1997-03-04 Danly Corporation Press-driven tool module in particular press-driven cross-punching or bending unit
US6295813B1 (en) * 1997-11-24 2001-10-02 Diebolt International, Inc. Press driven tool actuator module

Also Published As

Publication number Publication date
EP3181343A1 (fr) 2017-06-21
ES2686989T3 (es) 2018-10-23

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