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WO1996026023A1 - Actionneur hydraulique de poinçons et d'elements mobiles analogues destines au travail du metal en feuilles, et systeme hydraulique comprenant cet actionneur - Google Patents

Actionneur hydraulique de poinçons et d'elements mobiles analogues destines au travail du metal en feuilles, et systeme hydraulique comprenant cet actionneur Download PDF

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Publication number
WO1996026023A1
WO1996026023A1 PCT/EP1996/000663 EP9600663W WO9626023A1 WO 1996026023 A1 WO1996026023 A1 WO 1996026023A1 EP 9600663 W EP9600663 W EP 9600663W WO 9626023 A1 WO9626023 A1 WO 9626023A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
power
stroke
piston
head
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.)
Ceased
Application number
PCT/EP1996/000663
Other languages
English (en)
Inventor
Antonio Codatto
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.)
Sapim Amada SpA
Amada Co Ltd
Original Assignee
Sapim Amada SpA
Amada Co Ltd
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 Sapim Amada SpA, Amada Co Ltd filed Critical Sapim Amada SpA
Priority to JP8525376A priority Critical patent/JPH11501870A/ja
Publication of WO1996026023A1 publication Critical patent/WO1996026023A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/002—Drive of the tools

Definitions

  • Hydraulic actuator for punches and suchlike movable members for working sheet metal, and hydraulic system incorporating this actuator
  • the present invention relates to a hydraulic actuator for punches and suchlike movable members for working sheet metal, of the type comprising a fixed hydraulic cylinder, with a head part, in which slides a piston having a rod passing out through the opposite end of the cylinder from the head part and forming a ram for driving a punch or suchlike member, wherein, between the piston and the head part of the cylinder, is a head chamber for receiving the pressurized hydraulic fluid in order to cause the piston and its ram to execute a forward stroke between a rest end- of-stroke position and a working end-of-stroke position, and wherein the cylinder comprises, around the rod,, a return chamber for receiving the pressurized hydraulic fluid in order to cause the piston and its ram to execute a reverse stroke from the working end-of-stroke position to the rest end-of-stroke position.
  • the invention has been conceived in terms of its application to multiple-punch punching presses.
  • These machines comprise two opposing bodies, an upper and a lower, of which the upper body contains a plurality of movable punches while the lower body contains a corresponding plurality of dies, each associated with a corresponding punch.
  • the two bodies may be in the form of blocks in which the punches and the dies are arranged in rows and columns, or in the form of turrets in which the punches and the dies are arranged in circular rings .
  • the upper body has a hydraulic actuator associated thereto, of the kind defined above, the rod or ram of which, gergally called “tamper”, selectively drives, as and when required, one of the punches, in order to perform a particular punching, blanking, drawing or other operation.
  • a hydraulic actuator associated thereto, of the kind defined above, the rod or ram of which, gergally called “tamper”, selectively drives, as and when required, one of the punches, in order to perform a particular punching, blanking, drawing or other operation.
  • a bending unit comprising two blocks, the upper block being movably mounted in the place of a punch and the lower block being fixed in the place of a die.
  • These two blocks incorporate, respectively, blankholders and at least one bending blade cooperating with an opposing bending blade, in which the working movement of the blade is produced from the same ram as is used to actuate the punches . Details of these bending units are described and illustrated in three Italian patent applications filed by the Applicant company on 6 February 1995 under numbers TO95A000071, TO95A000072 and TO95A000073.
  • the known actuators used for punching, blanking or drawing operations, and used also for bending operations are in practice double-acting actuators in which the head chamber, of invariable section, is the only working chamber.
  • the only function of the hydraulic fluid injected into this chamber from a constant-pressure source is to move the ram on its forward stroke, between a rest end-of- stroke position and a working end-of-stroke position, there being no means of controlling the speed of the stroke or the force exerted.
  • the cylinder comprises a fixed annular dividing wall extending towards the piston, which wall defines in its interior the abovementioned head chamber and which together with the cylinder defines around its exterior a blind annular chamber forming a power chamber, in that the piston com ⁇ prises an annular projection that slides inside the power chamber, in that the dividing wall comprises at least one transverse passage for communication between the head chamber and the power chamber, which passage is closed by the annular projection in all positions of the piston between the rest end-of-stroke position and a mid-stroke position in order to prevent the hydraulic pressure from being applied from the head chamber to the power chamber, and is opened by the annular projection in all positions of the piston between the abovementioned mid-stroke position and the working end-of-stroke position.
  • the hydraulic fluid admitted into the head chamber from a constant-pressure source merely causes the rod of the actuator to perform a stroke under constant pressure and the working force exerted on the punch or other working member, such as the movable block of a bending unit, is always the same, no matter what kind of operation is being carried out (punching, blanking, drawing or bending) and irrespective of the area of the workpiece on which this operation is being carried out .
  • this object is achieved by means of an actuator characterized in that the abovementioned power chamber is a low-power chamber and in that, between the annular projection and the rod, the piston comprises a cylindrical collar whose diameter is greater than the diameter of the annular projection, the cylinder comprises a cylindrical cavity in which the collar slides and this cavity forms a high-power chamber which can selectively receive the pressurized hydraulic fluid on the side of the collar nearest the head part of the cylinder.
  • the piston may comprise cylindrical collars of increasing diameters greater than the diameter of the annular projection, and the cylinder may then comprise corresponding cylindrical cavities in which the respective collars slide, these cavities forming a corresponding number of chambers of increasingly high power which can selectively receive the pressurized hydraulic fluid on the side of the respective collars nearest the head part of the cylinder.
  • the invention also relates to a hydraulic system incorporating an actuator according to the invention and equipped with valve means for selecting low- and high-power strokes and for selecting whether or not the job requires a prestroke of approach.
  • Figure 1 is a schematic longitudinal section through a hydraulic actuator for punches and suchlike movable members for working sheet metal, in its rest condition
  • Figure 2 illustrates a hydraulic system for the actuator of Figure 1, in a condition corresponding to a prestroke of approach which will be followed by a low-power working stroke
  • Figure 3 is a section on a smaller scale through the actuator of Figure 2 in the same prestroke condition as Figure 2 ,
  • FIG. 4 shows the same hydraulic system as in Figure
  • Figure 5 is a longitudinal section similar to Figure
  • Figure 7 shows the same hydraulic circuit in the condition corresponding to a high-power working stroke
  • Figure 8 is another section similar to Figures 3 and 5, in which the actuator is shown in a condition corresponding to a high-power working stroke
  • Figure 9 shows the hydraulic system in the condition in which the actuator as shown in Figure 5 is performing a complete low-power working stroke with no prestroke
  • Figure 10 again shows the same hydraulic system in the condition in which the actuator as shown in Figure 8 is performing a complete high-power working stroke with no prestroke
  • FIG. 11 again shows the same hydraulic system in the condition of withdrawal of the rod from the working end-of- stroke position to the rest end-of-stroke position
  • Figure 12 is another section through the actuator corresponding to the condition of the system shown in Figure 11.
  • a hydraulic actuator comprises a fixed hydraulic cylinder 10 with a head part 12.
  • a piston 14 having a rod 16 slides inside the cylinder 10.
  • the rod 16 passes out through the opposite end 18 of the cylinder 10 from the head part 12 and forms a ram for driving a punch or suchlike member.
  • a head chamber 20 for receiving pressurized hydraulic fluid from an injection/discharge manifold line 22.
  • the cylinder 10 comprises, around the rod 16, a return chamber 24 that constantly receives the pressurized hydraulic fluid through a manifold line 26.
  • the head chamber 20 has a cross section or diameter greater than the cross section or diameter of the return chamber 24. Consequently, when the pressure in the head chamber is equal to the delivery pressure, the same pressure in the return chamber 24 does not oppose the forward stroke of the piston 14 corresponding to the advancing of the ram 16.
  • the cylinder 10 has a fixed annular dividing wall 28 attached threto.
  • the annular chamber 30 is a power chamber.
  • the power chamber 30 can be put in direct com ⁇ munication with the pressure source, under certain conditions, through an extra line 32, which for the moment will be assumed to be closed.
  • this has an annular projection 34 that slides inside the power chamber. Adjacent to this annular projection 34, the annular dividing wall 28 comprises at least one transverse passage and preferably a plurality of transverse passages 36 for communication between the head chamber 20 and the power chamber 30.
  • the arrangement is such that the passages 36 are closed by the annular projection 34 in all positions of the piston 14 between the rest end-of-stroke position of Figure 1 and a mid-stroke position (see e.g. Figure 3) in order to prevent the hydraulic pressure from being applied from the head chamber 20 to the power chamber 30.
  • the passage or passages 36 are opened by the annular projection 34 when the piston advances past the position shown in Figure 3 and for the remainder of the piston stroke, as far as the working end-of-stroke position (see e.g. Figure 5) .
  • the piston In order to produce a working stroke with still greater power or force, between the annular projection 34 and the rod 16 the piston comprises a cylindrical collar 38 whose diameter is greater than that of the annular projection 34. Adjacent to this collar 38, the cylinder 10 has a cylindrical cavity 40 in which the collar 38 slides. This cavity forms a high-power chamber, also marked 40, which can selectively receive the pressurized hydraulic fluid on the side of the collar 38 nearest the head part 12 of the cylinder 10.
  • the abovementioned power chamber 30 will hereinafter be called the low-power chamber to indicate that the force developed on the collar 38 is greater than that developed on the annular projection 34.
  • the high-power chamber 40 can be filled selectively from the low-power chamber 30 via external valve means forming part of the circuit of the hydraulic system illustrated in Figures 2, 4, 6, 7, 9, 10 and 11.
  • the piston 14 could comprise a plurality of cylindrical collars like the collar 38, but of increasing diameters greater than the diameter of the annular projection 34, and the cylinder 10 would comprise corresponding cylindrical cavities in which the respective collars would slide. These cavities would then form a corresponding number of chambers of increasingly high power which can selectively receive the pressurized hydraulic fluid on the side of the collar nearest the head part 12 of the cylinder 10.
  • the actuator comprises a position transducer indicated by the general reference 44, for sending an electrical signal corresponding to the position of the piston 14 in the cylinder 10 to a control apparatus.
  • the transducer 44 comprises a known type of encoder 46 fixed to the head part 12 and comprising in turn a transducer rod 48 extending down a cavity inside the centre of the piston 14.
  • the transducer rod 48 is surrounded by a magnet 50 in the form of a sleeve fixed to the piston 14 inside the head chamber 20.
  • the position transducer 44 makes it possible, through the numerical-control system, to program the working stroke of the piston 14 and its ram 16 to suit the operations to be carried out.
  • the piston 14 can be programmed to return to the rest end-of-stroke position before the working end-of-stroke position is reached.
  • the system comprises principal switching valve means for selectively connecting the head chamber 20 to the source P of pressurized hydraulic fluid.
  • these switching valve means include a two-position solenoid valve V_ and a two-position hydraulic valve V 2 .
  • valve V. allows the pressure to be transmitted to the head chamber 20, while the pressure transmitted to the return chamber 24 is taken from the line P upstream of valve V 1 .
  • solenoid valve V x connects to the discharge T the hydraulic actuator of valve V 2 , which remains in the position illustrated in these same figures .
  • solenoid valve V For the return of the piston 14 to the rest end-of- stroke position, the position of solenoid valve V. is changed as illustrated in Figure 11, removing the pressure from the head chamber 20 and applying pressure to the actuator of hydraulic valve V,. The latter then changes position, as illustrated in Figure 11, thereby removing the pressure from the entire system except in the line supplying the return chamber 24.
  • the circuit includes two automatic hydraulically-controlled valves V 5 , V 6 whose functions will be obvious to those skilled in the art.
  • valve V set to pass the pressurized fluid into the head chamber 20.
  • Solenoid valve V 3 is closed and prevents the pressurized fluid from passing through it and into the other chambers of the actuator and in particular the low-power chamber 30.
  • Figure 5 reflects the situation in which the piston 14 and its ram 16 are driven to the bottom of the working stroke by the pressure in the low-power chamber 30.
  • the ram 16 can exert, for example, a working force of 9 tonnes.
  • the hydraulic system illustrated also offers the possibility of having the piston 14 and its ram 16 execute a stroke at working pressure throughout, beginning at its rest end-of-stroke position.
  • Figure 9 illustrates the case of a working stroke with no prestroke and at low power.
  • the circuit differs in that solenoid valve V 3 is open, with the result that the opening of solenoid valve V 1 puts the pressure source in communication simultaneously with both the head chamber 20 and the low-power chamber 30.
  • Figure 10 the system is set up for a working stroke with no prestroke and at high power.
  • valve V 4 Whilst in the situation of Figure 9 only valve V, was open, in the situation of Figure 10 valve V 4 is open as well.
  • the pressurized fluid simultaneously reaches all the chambers 20, 30 and 40, producing in the actuator 10 the condition of pressure shown in Figure 8 and in particular causing the piston 14 and its ram 16 to descend under the force of the pressurized fluid present in all the chambers 20, 30 and 40.
  • the execution of working cycles at the different powers, with or without prestroke can be achieved by using selective valve means for placing these high-power chambers in communication with a low-power chamber such as 30 as soon as the latter is in receipt of pressure through the passages 36, to give a working cycle with a prestroke; on the other hand, in order to execute a working cycle with no prestroke, the valve means will be set in such a way as to transmit the pressure immediately to the chambers corresponding to the desired power.
  • solenoid valve V 1 has been switched and the pressure of the source P is no longer being transmitted to the head chamber 12 of the actuator, which instead is in communication with the discharge T as usual .
  • the pressure is applied to the return chamber 24 and, via valve V ⁇ , is also applied to the operating means of hydraulic valve V 2 .
  • the position of valve V 2 is then such as to connect the power chambers 30 and 40 of the actuator to the discharge, thus allowing the pressure in the return chamber 24 to act .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Punching Or Piercing (AREA)

Abstract

Le cylindre (10) de cet actionneur comprend, dans sa partie (12) supérieure, une paroi (28) annulaire fixe, séparatrice, qui s'étend en direction du piston (14). Cette paroi (28) délimite, à l'intérieur de celle-ci une chambre (20) supérieure, et à l'extérieur, une chambre annulaire borgne formant chambre (30) de puissance. Le piston (14) comporte un épaulement (34) coulissant à l'intérieur de la chambre (30) de puissance. La paroi (28) séparatrice comprend au moins un passage (36) transversal destiné à établir la communication entre la chambre (20) supérieure et la chambre (30) de puissance. Ce passage (36) est fermé par l'épaulement (34) annulaire dans toutes les positions du piston (14) se situant entre la position de repos/fin de course et une position de mi-course, de manière à empêcher la pression hydraulique d'être appliquée de la chambre (20) supérieure à la chambre (30) de puissance, et est ouvert par ce même épaulement (34) dans toutes les positions du piston (14) se situant entre la position de mi-course, ci-dessus mentionnée, et la position de travail/fin de course. La chambre (30) de puissance ci-dessus décrite est préférablement une chambre faible puissance. Entre l'épaulement (34) annulaire et la tige (16), le piston (14) comprend un collier (38) cylindrique dont le diamètre est supérieur à celui de l'épaulement (34) annulaire. Le cylindre (10) comprend en outre une cavité cylindrique dans laquelle le collier coulisse, cette cavité formant une chambre (40) haute puissance qui peut recevoir de manière sélective le fluide hydraulique sous pression sur le côté du collier (38) situé le plus près de la partie (12) supérieure du cylindre (10).
PCT/EP1996/000663 1995-02-24 1996-02-16 Actionneur hydraulique de poinçons et d'elements mobiles analogues destines au travail du metal en feuilles, et systeme hydraulique comprenant cet actionneur Ceased WO1996026023A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8525376A JPH11501870A (ja) 1995-02-24 1996-02-16 板金を加工するためのパンチ及び同様の移動部材のための流体アクチュエータ及びこのアクチュエータを取付けた流体システム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000136A IT1278959B1 (it) 1995-02-24 1995-02-24 Attuatore idraulico per punzoni e simili organi scorrevoli per la lavorazione di lamiere, ed impianto incorporante tale attuatore.
ITTO95A000136 1995-02-24

Publications (1)

Publication Number Publication Date
WO1996026023A1 true WO1996026023A1 (fr) 1996-08-29

Family

ID=11413262

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/000663 Ceased WO1996026023A1 (fr) 1995-02-24 1996-02-16 Actionneur hydraulique de poinçons et d'elements mobiles analogues destines au travail du metal en feuilles, et systeme hydraulique comprenant cet actionneur

Country Status (3)

Country Link
JP (1) JPH11501870A (fr)
IT (1) IT1278959B1 (fr)
WO (1) WO1996026023A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1445041A1 (fr) * 2003-02-07 2004-08-11 SALVAGNINI ITALIA S.p.A. Dispositif pour détecter la position de poinçons dans une poinçonneuse pour tôle comprenant plusieurs poinçons
IT201900012969A1 (it) * 2019-07-26 2021-01-26 Mecolpress S P A Apparecchiatura per lo stampaggio di materiali.
CN113329828A (zh) * 2019-01-23 2021-08-31 Tox机械工程股份有限公司 用于冲制和冲压板状工件的装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2148309A1 (fr) * 1971-08-05 1973-03-11 Frieseke & Hoepfner Gmbh
US4116122A (en) * 1976-10-11 1978-09-26 Osterwalder Ag Hydraulic driven press
US4823658A (en) * 1985-10-18 1989-04-25 Spicer Andrew I Punch presses
US5186095A (en) * 1991-01-09 1993-02-16 Todd Motion Controls, Inc. Piston assembly and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2148309A1 (fr) * 1971-08-05 1973-03-11 Frieseke & Hoepfner Gmbh
US4116122A (en) * 1976-10-11 1978-09-26 Osterwalder Ag Hydraulic driven press
US4823658A (en) * 1985-10-18 1989-04-25 Spicer Andrew I Punch presses
US5186095A (en) * 1991-01-09 1993-02-16 Todd Motion Controls, Inc. Piston assembly and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1445041A1 (fr) * 2003-02-07 2004-08-11 SALVAGNINI ITALIA S.p.A. Dispositif pour détecter la position de poinçons dans une poinçonneuse pour tôle comprenant plusieurs poinçons
CN113329828A (zh) * 2019-01-23 2021-08-31 Tox机械工程股份有限公司 用于冲制和冲压板状工件的装置
CN113329828B (zh) * 2019-01-23 2023-08-08 Tox机械工程股份有限公司 用于冲制和冲压板状工件的装置
IT201900012969A1 (it) * 2019-07-26 2021-01-26 Mecolpress S P A Apparecchiatura per lo stampaggio di materiali.
EP3769949A1 (fr) * 2019-07-26 2021-01-27 Mecolpress S.p.A. Appareil de moulage de matériaux

Also Published As

Publication number Publication date
JPH11501870A (ja) 1999-02-16
ITTO950136A1 (it) 1996-08-24
ITTO950136A0 (it) 1995-02-24
IT1278959B1 (it) 1997-12-02

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