EP1531039B1 - Actionneur linéaire électro-hydraulique pour presses - Google Patents

Actionneur linéaire électro-hydraulique pour presses Download PDF

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Publication number
EP1531039B1
EP1531039B1 EP04026429A EP04026429A EP1531039B1 EP 1531039 B1 EP1531039 B1 EP 1531039B1 EP 04026429 A EP04026429 A EP 04026429A EP 04026429 A EP04026429 A EP 04026429A EP 1531039 B1 EP1531039 B1 EP 1531039B1
Authority
EP
European Patent Office
Prior art keywords
piston
rod
hydraulic
screw
worm screw
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
EP04026429A
Other languages
German (de)
English (en)
Other versions
EP1531039A2 (fr
EP1531039A3 (fr
Inventor
Giovanni Cella
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.)
TASK 84 S.P.A.
Original Assignee
Task 84 SpA
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 Task 84 SpA filed Critical Task 84 SpA
Publication of EP1531039A2 publication Critical patent/EP1531039A2/fr
Publication of EP1531039A3 publication Critical patent/EP1531039A3/fr
Application granted granted Critical
Publication of EP1531039B1 publication Critical patent/EP1531039B1/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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/088—Characterised by the construction of the motor unit the motor using combined actuation, e.g. electric and fluid actuation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/161—Control arrangements for fluid-driven presses controlling the ram speed and ram pressure, e.g. fast approach speed at low pressure, low pressing speed at high pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/166—Electrical control arrangements
    • 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
    • F15B11/022—Systems essentially incorporating special features for controlling the speed or actuating force of an output member in which a rapid approach stroke is followed by a slower, high-force working stroke

Definitions

  • the present invention deals with an electro-hydraulic linear actuator for operating presses, where the term “electro-hydraulic” means an actuator or jack in which the piston movement occurs through an electric actuator or by means of an hydraulic thrust according to the press working cycle steps.
  • a first step of descending the jack piston in order to take a tool connected thereto to operate on a work-piece to be worked a second step of working or pressing and a third step of ascending the piston in order to take the tool back in its cycle beginning conditions.
  • the first and the third steps are as quick as possible, being dead steps in which the tool does not exert any pressure or working on the work-piece.
  • the first step of quick descending can be easily reached since the gravity force aids the hydraulic thrust, while the third step of ascending or contrary to the thrust step must be obtained with quick actuator means.
  • the known prior art provides for the use of a double-acting hydraulic jack that is supplied by an hydraulic circuit comprising proportional servo-valves in order to have low speeds during placement and high speeds for movements.
  • a system is known from patent US 5,345,766 for which an arrangement for carrying out a two-stage linear movement with a stationary and a movable constructional unit, comprises a hydraulic cylinder and a hydraulic piston preferably in the form of a plunger.
  • the hydraulic piston has a hollow volume which houses a plunger piston which, in turn, rests on a spindle rotated by a servomotor in the movable constructional unit.
  • the spindle does not move the hydraulic piston, but it closes or opens a valve by means that make the arrangement slower.
  • Object of the present invention is making the movements quicker without impairing the thrust efficiency.
  • the technical problem to be solved is completely removing the hydraulic action during the press tool movements, leaving for such hydraulic action only the step of positioning and pressing.
  • 1 designates a simple-acting hydraulic jack composed of a liner or cylinder 2 within which a piston 3 slides, ad the end of which a working tool of a press, not shown, is secured.
  • Rod and piston in the shown example, coincide.
  • a coaxial hole 4 is provided, closed in its upper part by a scroll 5 within which a worm screw 6 is threaded.
  • the liner is closed in its upper part by a head cover 7, in which an oil delivery duct 8 is provided, that sends oil into the cylinder chamber 9 through a duct 10.
  • the worm screw 6 crosses the cover 7 and is supported by the cover itself through a bush 11 and a thrust bearing or bushing 12 inserted in an hole 13 coaxial with the piston axis.
  • the worm screw 6 has an abutment ring 14 that rests against the bearing or bushing 12 due to the pressure of a resilient means composed of a pack 15 of Belleville washers inserted between such thrust bearing 12 and the bush 11.
  • the worm screw further has means for discharging the jack chamber 9: these means, in the shown example, are composed of an annular groove 16 that communicates an oil discharge duct 17 with the chamber 9 through a channel 18.
  • the screw 6, after having crossed the bush 11, has in its end side a portion of grooved shaft 19 that engages a sleeve 20 with internal groove.
  • the sleeve 21 is keyed-in on the shaft of a reversible electric motor 21.
  • the screw will advantageously be of the ball re-circulation type.
  • the electric motor 21 rotates the screw 6 that makes the scroll 5, and therefore the rod or piston 3 connected thereto, quickly move downwards.
  • the movement performed by the electric motor is surely quicker that a movement performed with hydraulic oil.
  • the pack of Belleville washers is compressed and the annular groove, that before discharged the pump to the oil tank, by moving upwards closes this discharge and the jack chamber 9 is pressurised and then the electric axis can go on in its descent stroke aided by the oil pressure thrust onto the rod. In this step, it is the oil pressure that exerts the greatest thrust onto the tool.
  • the hydraulic circuit is normally being discharged and is pressurised only during the press tool working step.
  • the quick rod or piston movement both when descending and when ascending, is performed by the electric system composed of reversible motor 21, screw 6, scroll 5 stiffly connected to rod 3, while the pressing working stroke is jointly performed by electric motor and hydraulic circuit being pressurised.
  • the hydraulic circuit could also be of the double-acting type, depending on the electric system inertia, in order to exploit the lower jack chamber to reduce the system inertia.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)
  • Actuator (AREA)
  • Press Drives And Press Lines (AREA)

Claims (2)

  1. Actionneur linéaire électro-hydraulique pour presses, du type comprenant un vérin à la tige ou au piston duquel est connecté un outil de travail, dans le piston du vérin, une bague-écrou (5) est prévue dans laquelle une vis sans fin (6) est engagée, ladite vis sans fin (6) étant actionnée par un moteur électrique réversible (21), ladite vis sans fin (6) étant pourvue de moyens adaptés pour normalement mettre à l'échappement un circuit hydraulique pour alimenter le vérin pendant les phases de descente rapide et de retour à une position soulevée et pour fermer les échappements pendant les phases de travail de l'outil, lesdits moyens étant commandés par la vis sans fin (6), caractérisé en ce que les moyens adaptés pour normalement mettre à l'échappement le circuit hydraulique comprennent une rainure annulaire (16) obtenue sur la vis sans fin (6) à proximité d'un conduit d'échappement de l'huile et d'un canal d'alimentation de l'huile (18) provenant du circuit hydraulique.
  2. Actionneur selon la revendication 1, caractérisé en ce que la vis sans fin présente un anneau (14) sur lequel des moyens résilients (15) appuient, de tels moyens (15) poussant la vis, et donc la relative rainure annulaire, dans une position de fermeture du canal d'échappement du circuit hydraulique lorsque le moteur électrique n'est plus à même de faire descendre la tige ou le piston.
EP04026429A 2003-11-12 2004-11-08 Actionneur linéaire électro-hydraulique pour presses Not-in-force EP1531039B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPR20030100 2003-11-12
IT000100A ITPR20030100A1 (it) 2003-11-12 2003-11-12 Attuatore lineare elettro-idraulico per presse.

Publications (3)

Publication Number Publication Date
EP1531039A2 EP1531039A2 (fr) 2005-05-18
EP1531039A3 EP1531039A3 (fr) 2005-08-17
EP1531039B1 true EP1531039B1 (fr) 2007-05-30

Family

ID=34430796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04026429A Not-in-force EP1531039B1 (fr) 2003-11-12 2004-11-08 Actionneur linéaire électro-hydraulique pour presses

Country Status (4)

Country Link
EP (1) EP1531039B1 (fr)
AT (1) ATE363379T1 (fr)
DE (1) DE602004006693D1 (fr)
IT (1) ITPR20030100A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472465A1 (fr) * 1979-12-26 1981-07-03 Lbm Presses Perfectionnements apportes aux presses hydrauliques, et notamment a leurs systemes de commande de la vitesse d'approche
US5345766A (en) * 1991-01-14 1994-09-13 Engel Maschinenbau Gesellschaft M.B.H. Arrangement for carrying out a two-stage linear movement
EP1307330B1 (fr) * 2000-08-08 2004-03-10 Bosch Rexroth AG Dispositif d'entrainement, notamment pour l'unite de fermeture, l'unite d'injection ou les ejecteurs d'une presse d'injection de matieres plastiques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ITPR20030100A1 (it) 2005-05-13
DE602004006693D1 (de) 2007-07-12
ATE363379T1 (de) 2007-06-15
EP1531039A2 (fr) 2005-05-18
EP1531039A3 (fr) 2005-08-17

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