EP0703020A2 - Machine d'usinage à dispositifs de fixation de pièce à travailler mobiles - Google Patents

Machine d'usinage à dispositifs de fixation de pièce à travailler mobiles Download PDF

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Publication number
EP0703020A2
EP0703020A2 EP95113809A EP95113809A EP0703020A2 EP 0703020 A2 EP0703020 A2 EP 0703020A2 EP 95113809 A EP95113809 A EP 95113809A EP 95113809 A EP95113809 A EP 95113809A EP 0703020 A2 EP0703020 A2 EP 0703020A2
Authority
EP
European Patent Office
Prior art keywords
drive
control
workpiece
slide
valve
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.)
Granted
Application number
EP95113809A
Other languages
German (de)
English (en)
Other versions
EP0703020A3 (fr
EP0703020B1 (fr
Inventor
Eckehart Schulze
Peter Bytow
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.)
Trumpf SE and Co KG
Original Assignee
Trumpf SE and Co KG
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 Trumpf SE and Co KG filed Critical Trumpf SE and Co KG
Publication of EP0703020A2 publication Critical patent/EP0703020A2/fr
Publication of EP0703020A3 publication Critical patent/EP0703020A3/fr
Application granted granted Critical
Publication of EP0703020B1 publication Critical patent/EP0703020B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material
    • 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
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/04—Centering the work; Positioning the tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/463—Work-feed element contacts and moves with work
    • Y10T83/4632—Comprises a work-moving gripper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/654—With work-constraining means on work conveyor [i.e., "work-carrier"]
    • Y10T83/6563—With means to orient or position work carrier relative to tool station
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer
    • Y10T83/7487—Means to clamp work
    • Y10T83/754—Clamp driven by yieldable means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer
    • Y10T83/7487—Means to clamp work
    • Y10T83/7547—Liquid pressure actuating means

Definitions

  • the invention relates to a processing machine, in particular a punching machine, with a processing head and a workpiece guide which can be moved relative to the workpiece, on which at least two holding devices for the workpiece, which can be fixed in a controlled manner on the workpiece and can be moved relative to the workpiece and the workpiece guide by means of an energy source are provided, the drive means of the holding devices being connected to the energy source via at least one switching element which can be coupled to the workpiece, and the switching element being associated with a stop which is stationary relative to the machining head and the holding device in question when the switching element has hit the stop into a workpiece releasing position is controlled and moved relative to the workpiece in a position with a safety distance from the machining head.
  • the workpiece to be processed is fed mechanically or automatically relative to the processing head.
  • the holding devices serve to fix the workpiece in a defined position both during the infeed movement and during the machining process.
  • the entire workpiece must be accessible to the machining head in order to avoid material losses. This also applies in particular to the workpiece area covered by the holding devices fixed to the workpiece.
  • the stop which is stationary relative to the processing head
  • the so-called dead-area link an area is defined on the processing machine around the processing head from which the holding devices must be kept away, in particular to avoid damage.
  • the above-described movement of the holding devices controlled in the release position relative to the workpiece must accordingly be triggered as soon as the holding device in question reaches the limit of the danger zone around the machining head in the course of the feed movement of the workpiece.
  • an electrical switch connected to the workpiece guide is provided on a known processing machine, which switches an electrohydraulic valve when approaching a dead zone gate, via which a displacement drive for the associated holding device is actuated in the form of a hydraulic piston-cylinder unit.
  • the holding device is moved into an end position remote from the machining head by means of the hydraulic drive.
  • the electrohydraulic valve is switched to a switching position in which the hydraulic drive of the holding device moves it back into its initial position . Clamping jaws provided on the holding device for the workpiece are controlled mechanically coupled with the displacement drive.
  • the known processing machine results in a relatively slow actuation of the holding devices. Since the contact between the electrical switch attached to the workpiece guide and the associated dead zone link is maintained regardless of the movement of the holding devices, as long as the switch is in contact with the Dead area backdrop, the holding devices are moved after their release from the workpiece by a uniform, always constant path length into their end position determined by the design of the piston-cylinder unit of the displacement drive. Accordingly, the holding devices bypass the processing head on the known processing machine relatively widely, and it takes a relatively long time before the holding devices can be fixed on the workpiece again after passing through the processing head. Due to the circumstances mentioned, short processing times can disadvantageously not be achieved in the known processing machine.
  • the object of the invention is to provide a processing machine which allows workpiece processing to be accelerated compared to the known processing machine.
  • the switching element is connected to the associated holding device and has a slide switch, which is supported in the position in the position of the stop in the direction of the stop, the slide switch in at least one slide position connects the energy source to the drive means of the associated holding device and interrupts this connection in at least one further slide position.
  • the drive means by means of which the holding devices are moved relative to the workpiece are switched directly by the switching element. Further switching operations associated with additional switching times are eliminated.
  • the switching of the switching element is directly coupled to the relative movement of the associated holding device relative to the workpiece.
  • the switching slide is transferred to a switching position in which the drive means move the relevant holding device away from the processing head.
  • the slide switch moved with the holding device assumes a slide position in which the holding device is stopped.
  • the switch slide of the switching element is shifted in the opposite direction of its previous movement with a corresponding design of the stop serving as a dead zone link and finally assumes a switching position in which the holding device in question is moved back into its starting position on the workpiece.
  • the holding devices on the known processing machine are only moved away from the workpiece by the distance that is absolutely necessary for safely moving around the processing head.
  • the holding devices on the processing machine according to the invention accordingly bypass the processing head directly adjacent to the boundary of its danger zone and can therefore be fixed on the workpiece again within a very short time after passing the processing head. All in all, the inventive method Processing machine therefore realize high processing speeds.
  • the advantages of the processing machine according to the invention described above can also be achieved in cases in which the holding devices are moved relative to the workpiece and the workpiece guide by means of electrical drive means.
  • the holding devices can each be displaced relative to the workpiece and the workpiece guide by means of a displacement drive with at least one drive piston-drive cylinder unit as the drive means.
  • the advantageous effects described above can expediently be achieved in that the drive piston-drive cylinder unit is connected to a drive pressure source via the switching element, with a directional valve with a valve slide being provided as the switching slide as the switching element, which in at least one slide position Releases connection between the drive pressure source and the drive piston-drive cylinder unit and locks in at least one further slide position.
  • the drive cylinder is connected to the holding device on a processing machine of this type
  • the drive piston is designed as a double-acting piston and connected to the workpiece guide via a piston rod
  • the annular space of the drive cylinder is permanently connected to the drive pressure source and the cylinder space at the the side of the drive piston facing away from the annular space can be connected to the drive pressure source or an unpressurized space via the directional valve.
  • the valve slide releases the connection between the drive pressure source and the cylinder space on the side of the drive piston facing away from the annular space; in a further slide position, it blocks this connection and releases the connection between the cylinder space on the side of the drive piston facing away from the annular space and the unpressurized space.
  • the associated holding device In a slide position in which the valve slide releases the connection between the drive pressure source and the cylinder space on the side of the drive piston facing away from the annular space, the associated holding device is in its initial position on the workpiece. If the valve slide now runs on the stop marking the danger area around the machining head, the valve slide is moved into a slide position in which it blocks the connection between the drive pressure source and the cylinder space on the side of the drive piston facing away from the annular space and the connection of this cylinder space with releases the unpressurized space. Accordingly, the drive cylinder with the holding device connected to it is displaced relative to the drive piston by means of the drive pressure permanently present in the annular space of the drive cylinder.
  • the drive piston displaces the pressure medium present in the cylinder space on the side of the drive piston facing away from the annular space into the unpressurized space and the holding device finally assumes its position remote from the machining head.
  • the valve slide moves back to its starting position.
  • the cylinder space on the side of the drive piston facing away from the annular space is again connected to the drive pressure source. Accordingly, a pressure builds up in this cylinder space, by means of which the drive cylinder is pushed back into its starting position, in which the holding device in question is in its starting position on the workpiece.
  • the displacement drive described above can be designed both as a pneumatic and as a hydraulic drive system.
  • the last-mentioned embodiment is found in a preferred design of the processing machine according to the invention, on which a hydraulic directional control valve is provided as the switching element.
  • the hydraulic displacement drive can be switched directly by means of the hydraulic directional valve.
  • valve slide is acted upon by a spring element in the direction of the stop.
  • a spring element offers a structurally simple and easy-to-maintain option for applying force to the valve spool.
  • valve slide can be acted upon by means of the drive pressure source in the direction of the stop.
  • the control of the fixing of the holding devices on the workpiece or the release of the holding devices from the workpiece also offers a possibility of increasing the speed of the workpiece machining.
  • the holding devices can be fixed on the workpiece in a controlled manner by means of the respectively assigned switching element.
  • the mechanical inertia associated with a direct mechanical coupling of the movement of the holding devices relative to the workpiece and the workpiece guide and the fixing or releasing of the holding devices is avoided in this way.
  • the functions "moving the holding devices” and “setting or releasing the holding devices” can be parallelized in time or at least carried out in succession in close succession.
  • the holding devices each have at least two clamping jaws, between which the fixed workpiece is held in a clamped manner and at least one of which is rotatably mounted about an axis of rotation and wherein a directional valve with a valve slide is provided as the switching element characterized in that the rotatably mounted clamping jaws on the side of the axis of rotation facing away from the workpiece protrudes from this and is supported on a control cam which rises in the opposite direction of the workpiece and which is connected to a control piston guided in a control cylinder and can be displaced parallel to the workpiece plane thereon, and in that the control cylinder can be connected to a control pressure source via the directional control valve, the valve slide of the directional control valve releasing a connection between the control cylinder and the control pressure source in at least one control position and in at least one position ner further control position blocks this connection.
  • one and the same switching element can be used to control the assigned holding device into the position releasing the workpiece or into the position defining the workpiece and for actuating the drive for the movement of the holding device in question relative to the workpiece and the workpiece guide.
  • control piston control cylinder units which can be acted upon separately with a control pressure opens up the possibility of fixing or detaching the holding devices on the workpiece, decoupled from their relative movement relative to the workpiece and the workpiece guide.
  • control piston is designed as a differential piston and that the space of the control cylinder delimited by the smaller piston area is permanently connected to the control pressure source and the space of the control cylinder delimited by the larger piston area via the directional control valve the control pressure source or an unpressurized space can be connected, the valve spool in a control position releasing the connection between the control pressure source and the control cylinder space delimited by the larger piston area and in at least one further control position blocking this connection and releasing the connection to the unpressurized space.
  • the drive pressure source is provided as a control pressure source in a further preferred embodiment of the processing machine according to the invention.
  • valve spool is acted upon by a bridging control pressure in a connection that releases the connection between the control cylinder and the control pressure source / or can be moved into a position blocking this connection.
  • the holding devices can be controlled into the position in which they release the workpiece, regardless of a contact between the switching element and the stop which is stationary with respect to the machining head. In this position of the holding devices, the workpiece to be machined can be inserted into the holding devices in preparation for the machining process.
  • the bypass valve of all switching elements can expediently be acted upon simultaneously with the bypass control pressure, so that the workpiece to be machined can be inserted into all holding devices at the same time.
  • the minimization of the set-up times of the processing machine that can be achieved in this way contributes to a minimization of the total duration of the workpiece processing.
  • the control of the holding devices is provided independently of a contact between the valve slide and the stop which is stationary with respect to the processing head, that the valve slide has two telescopic slides which are guided towards each other in the direction of displacement, which are displaceable against each other against a restoring force, the first slide valve being assigned to the stop which is stationary relative to the machining head and the second slide valve is actuated by means of the bridging control pressure relative to the first slide valve in which the connection between the control cylinder and the control pressure source is released and / or in which this connection is blocked Position is displaceable.
  • the processing machine shown comprises a stand 1 with an upper machine part 2 and a lower machine part 3.
  • a workpiece guide 4 is arranged, by means of which a workpiece in the form of a metal sheet 5 in a horizontal plane can be moved relative to a punching station 6 at the front end of the stand 1.
  • the punching station 6 essentially consists of a machining head 7 mounted on the machine upper part 2 with a plunger 8 that can be moved up and down, and a die holder 9 supported on the machine bottom part 3, in which a die, not shown, is held.
  • the workpiece guide 4 comprises a guide carriage 10 which is driven in the direction of a double arrow 12 by means of a motor 11.
  • a pinion mounted on the drive shaft of the motor 11 meshes with a toothed rack 13 attached to the lower machine part 3.
  • a transverse rail 14 is guided on the guide carriage 10 such that it can be displaced transversely to the direction of movement thereof in the direction of a double arrow 15.
  • the cross rail 14 is driven by a motor 16 which acts on a toothed rack 18 which is fixedly connected to the cross rail 14 via a drive pinion 17.
  • a total of six guide housings 19 are rigidly connected to the cross rail 14.
  • a holding device in the form of a claw 20 is displaceably guided relative to the guide housing 19 in the direction of the double arrow 12. 2, only four of the total of six guide housings 19 or claws 20 are shown.
  • a stop designed as a dead zone link 21 is firmly connected to the die holder 9 and defines a danger zone around the machining head 7.
  • the dead zone link 21 is assigned a switching element 22, which is displaceably attached to each of the claws 20.
  • the switching element 22 of the lower claw 20 adjacent to the machining head 7 in FIG. 2 runs onto the dead zone link 21.
  • this claw 20 is opened and moved linearly in the direction of the cross rail 14 relative to the workpiece and the associated guide housing 19.
  • the claw 20 maintains this retracted position as long as the switching element 22 with the dead zone link 21 is in contact.
  • the metal sheet 5 is fixed to the workpiece guide 4 during this time by means of the remaining claws 20.
  • the contact between the relevant switching element 22 and the dead area link 21 ends, and the claw 20 becomes its starting position on the metal sheet 5 process back and fixed on this.
  • a hydraulic directional control valve with a valve spool 23 is used as the switching element 22, which is supported with a corresponding arrangement of the associated claws 20 relative to the machining head 7 via a feeler roller 24 on the dead zone link 21.
  • the valve spool 23 can have five spool positions I, II, III, IV, V.
  • a drive piston-drive cylinder unit 27 consisting of a drive piston 25 and a drive cylinder 26 is used.
  • the drive piston 25 is designed as a double-acting differential piston and via a Piston rod 28 on the guide housing 19 set.
  • the drive cylinder 26 is connected to the claw 20.
  • the annular space of the drive cylinder 26 is connected via a central bore 29 to a hydraulic pump 30 serving as a drive pressure source and is continuously acted upon by this with hydraulic fluid under drive pressure.
  • the cylinder space of the drive cylinder 26 on the side of the drive piston 25 facing away from the annular space is connected via a hydraulic line 31 to a working connection of the directional control valve 22.
  • a control cylinder 32 and a control piston 33 form a control piston-control cylinder unit 34.
  • the control piston 33 is also designed as a double-acting differential piston.
  • the control cylinder space delimited by the smaller piston area is permanently connected to the hydraulic pump 30, which is also used as a control pressure source, via a pressure line 35, which runs partly as a central longitudinal bore inside a guide rod 36 connected to the guide housing 19.
  • a hydraulic line 37 connects the control cylinder space delimited by the larger area of the control piston 33 to the second working connection of the directional control valve 22.
  • the directional control valve 22 is finally connected to the hydraulic pump 30 via a pump line 38 and connected via a tank line 39 to a pressure-free hydraulic tank, not shown, in the sense of being under ambient pressure.
  • a control piston 33 is formed in one piece with the control piston 33 and is provided on its wedge-shaped end facing away from the control piston 33 with a control curve 41 rising in the direction of the control piston 33.
  • a clamping jaw 43 of the claw 20 is supported on the control cam 41 by a support roller 42.
  • the clamping jaw 43 is rotatably mounted about an axis of rotation 44 and is acted upon on the side remote from the support roller 42 by a compression spring in the form of an expansion spring 45.
  • a rigid clamping jaw 46 of the claw 20 serves as a support for the metal sheet 5 and as an abutment for the spreading spring 45.
  • the claw 20 is clamped to the metal sheet 5.
  • the valve spool 23 is in the slide position I, in which it the hydraulic pump 30 via the pump line 38 and the hydraulic lines 31, 37 with the space of the drive cylinder 26 on the side of the drive piston 25 facing away from the annular space or with the larger area of the Control piston 33 connects limited space of the control cylinder 32.
  • the tank line 39 is blocked.
  • the same pressure, namely the drive pressure generated by the hydraulic pump 30, is present in the drive cylinder 26 on both sides of the drive piston 25. Due to the different size of the piston or cylinder surfaces acted upon by the drive pressure, however, the drive cylinder 26 is shown in FIGS. 3 and 4 move right end position.
  • valve slide 23 now runs with the feeler roller 24 arranged at its front end in the course of the movement of the sheet metal plate 5 accomplished by means of the workpiece guide 4 onto the dead zone link 21, then it is first shifted into the slide position II.
  • slide position II the space of the drive cylinder 26 is still connected to the hydraulic pump 30 on the side of the drive piston 25 facing away from the annular space.
  • the connection of the hydraulic pump 30 that can be established via the pump line 38 to the control cylinder space delimited by the larger area of the control piston 33 is blocked.
  • the valve slide 23 connects the control cylinder space delimited by the larger area of the control piston 33 via the hydraulic line 37 and the tank line 39 to the unpressurized hydraulic tank.
  • the control piston 33 displaces the hydraulic fluid from the control cylinder space delimited by the larger area of the control piston 33 under the action of the hydraulic pressure present in the annular space of the control cylinder 32. This is associated with a shift of the tensioning piston 40 in FIGS. 3 and 4 to the left. Actuated by the spreading spring 45, the clamping jaw 43 can now pivot into its open position, in which it releases the metal sheet 5.
  • valve slide 23 With continued movement of the workpiece guide 4 in the direction of the dead zone link 21, the valve slide 23 is moved into its slide position IV. In the slide position IV, the connection that can be established via the pump line 38 between the hydraulic pump 30 and the space of the drive cylinder 26 on the side of the drive piston 25 facing away from the annular space is blocked. The claw 20 is still controlled in the open position.
  • the dead zone link 21 is mounted opposite the machining head 7 in such a way that the claw 20 is always kept outside the danger zone around the machining head 7.
  • the dead zone link 21 is designed such that the contact with the valve slide 23 ends as soon as the claw 20 has passed the machining head 7 with a certain safety distance. As soon as the claw 20 has reached this position, the valve slide 23 is released and this then first passes through the slide positions III and II, in which the opened claw 20 is moved back to the metal plate 5, before it takes up the slide position I again, in which the claw 20 is closed and fixed to the metal sheet 5.
  • a reciprocating-piston-cylinder unit 48 indicated in FIG. 3 serves to raise and lower the dead-area link 21.
  • Lowering the dead-area link is possible, for example, in cases in which the machining tools at the punching station 6 can be changed with the aid of the workpiece guide 4 and closed
  • the workpiece guide 4 must be moved into the vicinity of the machining head 7 or the die holder 9.
  • the dead area link 21 is indicated in dashed lines in FIG. 3 in the lowered position.
  • the claws 20 must be switched to the open position so that the workpiece guide 4 can be loaded with the metal sheet 5 to be machined before the machining process begins, or so that the metal sheet 5 can be removed from the workpiece guide 4 after the machining has ended. This is by means of the in Figs. 5 and 6 shown devices possible regardless of contact between the valve spool 23 and the dead zone gate 21.
  • the valve spool 23 is composed of two part spools 49, 50 which are telescopically guided in the direction of displacement.
  • the part spool 49 is assigned to the dead zone link 21 and is moved onto it when it approaches it. This results in the switching operations described above.
  • the partial slide 50 guided in the interior of the partial slide 49 can be acted upon by a pneumatic bypass control pressure on a piston 51 via a pressure line 52.
  • Control edges 53, 54 of the inner slide member 50 are assigned control edges on the outer slide member 49.
  • FIG. 6a shows the mutual arrangement of the control edges 53, 54 on the inner slide part 50 compared to the assigned control edges on the outer slide part 49 in the starting position of the switching element 22.
  • the switching element 22 assumes the switching position I according to FIG. 3, ie the associated claw 20 is in its away from the cross rail 14 End position shifted and controlled in the closed position.
  • the inner slide part 50 on the piston 51 is acted upon by pneumatic bypass control pressure.
  • the inner slide member 50 moves relative to the outer slide member 49, which, as shown in FIG. 5, is supported on the housing of the control valve 22 until the control edges 53, 54 assume the position shown in FIG. 6b.
  • control edges 53, 54 block the hydraulic line 37 against the pump line 38 and at the same time release the connection between the hydraulic line 37 and the tank line 39. Accordingly, the control piston 33 can be displaced to the left in FIG. 3 under the effect of the pressure which is permanently present in the space of the control cylinder 32 which is limited by its smaller area. As already described above, this is associated with a rectified movement of the tensioning piston 40 and consequently a pivoting of the rotatably mounted clamping jaw 43 into the open position. Now the workpiece to be machined can be placed on the rigid jaws 46 of the claw 20.
  • FIG. 6c the position of the control edges 53, 54 of the inner slide valve 50 in the operating state of the directional control valve 22 is shown in FIG. 6c, in which the inner slide valve 50 is unloaded and the outer slide valve 49 that has run onto the dead zone link 21 in its position relative to the control cylinder 32 leading hydraulic line 37 locking position is shifted.
EP95113809A 1994-09-24 1995-09-02 Machine d'usinage à dispositifs de fixation de pièce à travailler mobiles Expired - Lifetime EP0703020B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9415514U DE9415514U1 (de) 1994-09-24 1994-09-24 Bearbeitungsmaschine mit bewegbaren Werkstückhaltevorrichtungen
DE9415514U 1994-09-24

Publications (3)

Publication Number Publication Date
EP0703020A2 true EP0703020A2 (fr) 1996-03-27
EP0703020A3 EP0703020A3 (fr) 1996-06-05
EP0703020B1 EP0703020B1 (fr) 2000-03-15

Family

ID=6914132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113809A Expired - Lifetime EP0703020B1 (fr) 1994-09-24 1995-09-02 Machine d'usinage à dispositifs de fixation de pièce à travailler mobiles

Country Status (4)

Country Link
US (1) US5701791A (fr)
EP (1) EP0703020B1 (fr)
JP (1) JP2637065B2 (fr)
DE (2) DE9415514U1 (fr)

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ITMI20062240A1 (it) * 2006-11-23 2008-05-24 Salvagnini Italia Spa Manipolatore di fogli di lamiera
DE102010063541A1 (de) * 2010-12-20 2012-06-21 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Werkstück-Halteeinrichtung zum Festlegen eines plattenartigen Werkstückes, insbesondere eines Blechs, an einer Werkstück-Bewegungseinheit einer Werkzeugmaschine
CN102989918A (zh) * 2012-04-23 2013-03-27 北京星和众工设备技术股份有限公司 一种步进式夹钳自动送料装置
CN103658299A (zh) * 2013-11-19 2014-03-26 嘉兴永发电子有限公司 通风板的冲压装置
KR102563440B1 (ko) * 2018-11-13 2023-08-03 현대자동차 주식회사 연료전지용 막-전극 어셈블리의 커팅 장치 및 방법
CN109571399A (zh) * 2019-01-08 2019-04-05 孙燕清 一种伸缩式电动卡钳
CN114633109A (zh) * 2022-02-24 2022-06-17 吴月雪 可自动转移闭合的圆筒充电桩钣金加工设备

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US5701791A (en) 1997-12-30
EP0703020A3 (fr) 1996-06-05
EP0703020B1 (fr) 2000-03-15
JP2637065B2 (ja) 1997-08-06
DE59507990D1 (de) 2000-04-20
DE9415514U1 (de) 1994-11-17

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