EP2669024B1 - Machine-outil et procédé destinés à l'évacuation d'une partie d'une pièce - Google Patents

Machine-outil et procédé destinés à l'évacuation d'une partie d'une pièce Download PDF

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Publication number
EP2669024B1
EP2669024B1 EP12169979.7A EP12169979A EP2669024B1 EP 2669024 B1 EP2669024 B1 EP 2669024B1 EP 12169979 A EP12169979 A EP 12169979A EP 2669024 B1 EP2669024 B1 EP 2669024B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
punch
hold
punching
along
Prior art date
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Active
Application number
EP12169979.7A
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German (de)
English (en)
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EP2669024A1 (fr
Inventor
Tobias Reiter
Wolfgang Laib
Stefan Büttner
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 Werkzeugmaschinen SE and Co KG
Original Assignee
Trumpf Werkzeugmaschinen 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 Werkzeugmaschinen SE and Co KG filed Critical Trumpf Werkzeugmaschinen SE and Co KG
Priority to EP12169979.7A priority Critical patent/EP2669024B1/fr
Priority to US13/903,204 priority patent/US9205481B2/en
Priority to CN201310206674.2A priority patent/CN103506518B/zh
Priority to JP2013113933A priority patent/JP6141105B2/ja
Publication of EP2669024A1 publication Critical patent/EP2669024A1/fr
Priority to US14/932,074 priority patent/US9446442B2/en
Application granted granted Critical
Publication of EP2669024B1 publication Critical patent/EP2669024B1/fr
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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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
    • B21D45/006—Stripping-off devices
    • 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
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • B21D28/265—Perforating, i.e. punching holes in sheets or flat parts with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template
    • 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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/06—Stripping-off devices
    • B21D45/08—Stripping-off devices interrelated with motion of tool
    • 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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/10—Combined ejecting and stripping-off devices
    • 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
    • Y10T83/04—Processes
    • Y10T83/0448—With subsequent handling [i.e., of product]
    • 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
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2135—Moving stripper timed with tool stroke
    • Y10T83/2137—And alternatively movable to or from operating position

Definitions

  • the present invention relates to a machine tool for punching processing of plate-like workpieces, preferably of sheet metal, comprising: a punching tool with a punch and a punching die, a drive unit for moving the punch and the punching die relative to each other along a stroke axis for punching the plate-like workpiece, as well as a along the lifting axis movable hold-down with a scraper, which abuts the punching punch on a top of the workpiece when punching the workpiece, a detection device for detecting a reference position of the blank holder along the stroke axis, wherein the scraper rests against the top of the workpiece, and a control device for positioning the scraper at a predetermined distance from the reference position along the lifting axis.
  • the invention also relates to a method for pushing out a workpiece part on a machine tool for punching processing of plate-like workpieces, in particular sheets.
  • a machine tool in which a scraper before the punching machining of the workpiece is arranged at a predetermined distance from the top of the workpiece, is from the EP 0 417 836 A1 known.
  • the cut-free workpiece part can be moved along the support plane on a workpiece table, for example so that it tilts over the edge of the workpiece table.
  • the workpiece part can be positioned for discharging but also over a part flap provided on the workpiece table, etc.
  • a so-called hold-down is often provided in punching the workpiece end facing a so-called - plate-like - scraper mounted during the punching stroke, more precisely during the punch or a punching blade the workpiece punched, rests on the top of the workpiece to hold down this punching.
  • the blank holder or the scraper can be used for discharging a workpiece part, as shown in the EP2184118A1 is shown, which describes a punching machine and a method for removing sheet metal parts from punching machines.
  • a punching tool is used, which has a so-called remote hold-down with a bottom with a first and second surface, which are not in a common plane. Through the first surface of a separated from a residual sheet section is clamped while the remaining sheet is not clamped by the second surface. To remove the separated sheet metal section from the punching machine, the unclamped residual sheet can be moved while the separated, clamped sheet metal section is securely held or moved independently of the residual sheet.
  • a workpiece part can also be discharged by the (residual) workpiece is moved along the support plane, wherein the cut workpiece part is taken from the rest of the workpiece and ejected.
  • the hold-down device or more precisely for the wiper, to no longer rest on the upper side of the workpiece during the sliding movement.
  • the distance of the blank holder when pushing out the workpiece part be so small that the researcherschiebende workpiece part can not slide over the remainder of the workpiece orologyschiebende workpiece part does not jam between the scraper and the rest of the workpiece.
  • a positioning of the scraper at a predetermined distance from the top of the workpiece is required.
  • the position of the scraper or hold-down can only be determined indirectly (eg by a displacement measurement of the punch).
  • the component tolerances of hold-down and wiper are, however, typically so great that positioning of the wiper at a defined distance from the top of the workpiece in this way can not be guaranteed.
  • a punch head assembly for a punch press to which a hydraulically operated scraper device is mounted with a scraper plate to hold down the workpiece during retraction of the punch.
  • the placement of the stripper plate at the top of a punching die can be detected by an abrupt increase in pressure in an impression cylinder associated with the stripper device which is hydraulically coupled to a plunger of the stamping head assembly.
  • the position of the plunger when placing the stripper plate can be determined by means of a path measuring device. This position can be compared with the position of the plunger, which this occupies when placing the Abstreiferplatte on an inserted between plunger and punching workpiece to determine the thickness of the workpiece.
  • JP10-286636A a punch press is described in which a contact time of a scraper with the workpiece is detected and a position signal supplied by a device for determining the position of the stripper is used to determine the wall thickness of the workpiece.
  • the ejection device can be a coordinate guide with a linear drive with which the tool clamped by means of collets can be moved or displaced over the support plane of a workpiece table.
  • the scraper For positioning the scraper at a desired distance above the workpiece, it is proposed to determine the position of the scraper or the blank holder, in which the scraper rests against the top of the workpiece and to set the desired distance, typically not larger, starting from this position is than the thickness of the plate-like workpiece, so that the scraper can serve as a guide while preventing the cut workpiece part from sliding over the remainder workpiece and between the scraper and the remainder workpiece jammed.
  • the machine tool has a carrier device for the movement coupling of the movement of the blank holder with the movement of the punch during the lifting of the scraper from the top of the workpiece.
  • the control means for positioning the scraper in the predetermined distance from the workpiece, the drive unit of the punch for the positioning of the scraper at the desired distance to the top of the workpiece use. It is understood that in the event that the hold-down device has its own e.g. hydraulic drive unit, the control device for positioning the scraper can drive the drive unit of the blank holder.
  • control device is designed to detect the onset of the movement coupling by comparing the positions of the blank holder and the punch along the stroke axis.
  • the position of the blank or the scraper during punching of the workpiece does not change, while the position of the punch varies along the stroke axis to punch through the workpiece can. Only when the upward movement after retraction of the punch or the punching blade from the workpiece, the movement of punch and hold down runs synchronously. After the start of the simultaneous upward movement, the punch and thus also the hold-down can be stopped after a predetermined path length at which the scraper reaches the desired distance from the top of the workpiece (i.e., its push-out position).
  • the detection device has a measuring device for determining the position of the hold-down device along the lifting axis.
  • the measuring device can be designed as a path measuring device and has, for example, an optical sensor in order to detect the position of the blank holder along the lifting axis.
  • a scale with equidistant position marks can be attached to the hold-down device, which can be detected with the aid of the optical sensor.
  • (distance) measuring devices based on other measuring principles can be used, for example Measuring devices based on the principle of magnetostriction.
  • a waveguide made of a ferromagnetic material is typically used as a measuring element as a measuring element and a movable permanent magnet is used as a position sensor, as described in detail in a retrievable under "www.mtssensors.de” article entitled “magnetostriction” ,
  • the hold-down device is connected to the punch by a biasing device which aligns a lower edge of the punch and a lower edge of the scraper flush with each other in a rest position.
  • the hold-down on the punch is typically spring-mounted, wherein the hold-down and the punch are moved synchronously and motion coupled along the lifting axis, provided that the biasing means, typically a spring, is not deflected from the rest position.
  • the movement of the biasing means from its rest position typically occurs when the underside of the wiper abuts the punching stroke at the top of the workpiece as it forms an abutment so that the force applied to the punch or biasing means increases and compresses the biasing means becomes.
  • the detection device is designed to detect the reference position of the blank holder by a force exerted by the punch on a drive unit force effect when placing the punch on the top of the workpiece.
  • the punching force increases as the punch reaches the top of the workpiece.
  • the case on the drive unit, such as a plunger, exerted increased Force can be detected, for example, as in the above-cited EP1281455B1 is described with respect to this aspect by reference to the content of this application. Since the lower edge of the scraper and the lower edge of the punch terminate flush, the position at which the lower edge of the punch rests against the upper side of the workpiece corresponds to the reference position of the scraper.
  • control device is designed to specify the distance of the scraper from the upper side of the workpiece as a function of a thickness of the workpiece to be machined.
  • the distance of the scraper from the top side of the workpiece should not be too large for reliable ejection, in order to avoid that the workpiece part to be ejected is jammed between the residual workpiece and the scraper.
  • the control device can remove the thickness of the machined workpiece from a storage device. But it is also possible to measure the thickness of the workpiece during the execution of a punching stroke, for example, those in the above-cited EP1281455B1 described way.
  • a positioning of the scraper at a distance of half the thickness of the workpiece has been found to be particularly favorable for the ejection of workpiece parts.
  • the scraper can also be positioned in a different (usually thickness-dependent) distance, wherein a positioning at a distance that is greater than the thickness of the workpiece should be avoided as a rule (it should apply: 0 xd ⁇ distance ⁇ 1.0 xd).
  • the distance can also be specified independently of the thickness of the workpiece. This is especially the case when a distance is given that is so small (eg, about 0.2 mm or less) that it is smaller than the workpiece thickness regardless of the type of workpiece to be machined.
  • the detection device for detecting the reference position has a sensor attached to the wiper.
  • the sensor can be an optical sensor which is covered by the workpiece when the stripper abuts against the workpiece and therefore does not detect any radiation. If the stripper abuts against the workpiece or if it is lifted off the workpiece, the area detected by the optical sensor changes Radiation performance clearly, so that the reference position of the scraper can be detected.
  • the wiper is an electrically conductive (metallic) component, and also the workpiece (typically a metal sheet) is electrically conductive. The reference position can therefore also be determined by a resistance measurement or a voltage measurement, since the lifting of the scraper from the workpiece interrupts the electrical contact between the two components.
  • the invention also relates to a method for pushing out a workpiece part on a machine tool for punching plate-like workpieces, which may be formed as described above, the method comprising: moving a punch and a punching die relative to each other along a stroke axis for cutting free the workpiece part from a punching machined workpiece, wherein during the punching of the workpiece by means of the punch a scraper attached to a hold on a top of the workpiece, detecting a reference position of the blank along the stroke axis, wherein the scraper rests against the surface of the workpiece, positioning the scraper in a predetermined distance from the reference position, and pushing out of the cut workpiece part by moving the workpiece part together with the workpiece along a support plane.
  • the cut workpiece part is pushed out by a movement of the (residual) workpiece along a support plane, wherein the workpiece part is taken from the (residual) workpiece.
  • the workpiece part can In this case, a removal position of the machine tool can be spent, which can be provided, for example, on a part flap, an edge of the workpiece support or possibly on a parts slide. From the discharge position, the workpiece part can be removed from the machine tool manually or by means of suitable transport devices.
  • the distance between the scraper and the upper side of the workpiece is predetermined as a function of a thickness of the workpiece. As has been shown above, it is typically favorable if the distance between the lower edge of the scraper and the upper side of the workpiece is not greater than the thickness of the workpiece, so that the distance should be adjusted as a function of the thickness of the workpiece the distance should typically be smaller than the workpiece thickness.
  • the distance corresponds to at least half the thickness of the workpiece, in order to ensure, in particular for thin workpieces with a thickness of less than 1 mm, that the workpiece part is not clamped between the scraper and the die when pushed out becomes.
  • the distance may possibly only amount to at least a quarter or at least one third of the thickness of the workpiece; in any case, the distance should be greater than zero to prevent jamming.
  • the hold-down device and the punch are motion-coupled during the lifting of the scraper from the top of the workpiece.
  • the punch is moved along the stroke axis relative to the scraper, which bears against the workpiece and is therefore stationary.
  • the hold-down and the punch are motion-coupled by means of a (mechanical) driving device.
  • the insertion of the movement coupling by comparing the positions of the blank holder and the punch detected along the stroke axis. As soon as the coupled movement starts, the two positions change synchronously, ie the distance between the two positions remains constant, which can be detected by means of suitable position or displacement measuring devices for the blank holder and the punch.
  • the hold-down device is connected to the punch by a biasing device, which aligns a lower edge of the punch and a lower edge of the scraper flush with each other in a rest position.
  • the reference position of the blank holder is detected by a force exerted on a drive unit of the punching force on placement of the punch on the top of the workpiece.
  • the biasing means is deflected, whereby the force exerted on the drive unit or the ram force increases, so that the position at which the scraper and the lower edge of the punch rests against the top of the workpiece , can be detected.
  • the desired distance can be adjusted after the punching of the workpiece by moving the punch from this reference position by an appropriate value, e.g. is moved by half the sheet thickness, upwards in order to push out the workpiece part process reliable.
  • Fig. 1 shows a machine tool 1 for cutting and / or forming plate-like workpieces in the form of a stamping / forming machine for processing sheets.
  • the punching / forming machine 1 has a C-shaped machine frame 2, in the throat area of which a workpiece support 3 designed as a workpiece support is arranged, which serves for supporting a workpiece to be machined in the form of a sheet 4.
  • the workpiece table 3 forms a horizontal support plane 5 for the sheet 4 to be processed, which is parallel to the x / y plane of the in Fig. 1 shown coordinate system runs.
  • the clamping device 7 clamped sheet 4 in the support plane 5 of the workpiece table 3 is displaced.
  • a punch-receiving 8 is arranged, in which a punch 9 is mounted. Furthermore, at the front end of the lower leg of the C-shaped machine frame 2, a die holder 10 is provided, in which a punching die 11 is mounted. The punch 9 and the punching die 11 form a tool 12 for cutting the sheet 4.
  • a drive unit of the punching / forming machine 1 is formed by a punch drive 13 and a die drive 14 in the form of linear drives.
  • the punch drive 13 By means of the punch drive 13, the punch receptacle 8 together with the stamped or fixed punch 9 mounted along a lifting axis 15 relative to the workpiece table 3 can be raised and lowered.
  • the die holder 10 together with the stamped die 11 mounted or fixed therein can be raised and lowered by means of the die drive 14 along the lifting axis 15 relative to the workpiece table 3.
  • the punch-holder 8 and the die holder 10 by means of a rotary drive, not shown in detail independently of one another about a tool axis of rotation 16 identical to the lifting axis 15 rotationally adjustable.
  • a linear magazine 17 is provided with further tools 12.
  • the tools 12 located in the linear magazine 17 are each held by a tool cassette 18 and can be fixed to the stamp holder 8 or the female holder 10 as required for machining the sheet 4, with tools 12 in particular also being used for forming the workpiece 4 can be kept in the linear magazine 17.
  • the numerical control unit 19 comprises, in particular, memory means 20 for storing tool data and control means 21 for detecting both the raising, lowering and rotating movements of the punch holder 8 and the raising, lowering and rotating movements of the die holder 10 based on the stored data on the workpiece 4 and the tool 12 to measure and control.
  • Fig. 2a -d describes several steps of a punching stroke carried out with the aid of the punch 12, wherein Fig. 2a-d only the punch 9 of the punching tool 12 is shown, since the punching die 11, on which the workpiece 4 rests, remains stationary in the punching operation described here.
  • the in Fig. 2a-d shown punch 9 extends at its end facing the workpiece 4 in a cylindrical opening of a blank holder 24.
  • the punch 9 is moved by means of the punch drive 13 along the lifting axis 15.
  • media pressure eg pneumatic, hydraulic
  • the hold-down 24 is seated on a driving surface (not shown) of the punch 9, so that the movement of the punch 9 the Speed and the position of the blank holder 24 during the downward movement along the Hubachse 15 pretends.
  • a plate-shaped scraper 25 is mounted in which a passage opening for the passage of a punching blade 9a of the punch 9 is provided for the punching machining of the workpiece 4.
  • Fig. 2a is the punch 9, more precisely, the punching blade 9a, in a retracted position within extending along the lifting axis 15 opening of the blank holder 24.
  • position S of the punch 9 along the lifting axis 15 the lower end or defines the end face of the punching blade 9a.
  • a position P of the blank holder 24 is defined along the lifting axis 15 by the lower end (front side), to which the plate-shaped scraper 25 is attached.
  • Fig. 2b As in Fig. 2b is shown when punching the workpiece 4 of the attached to the hold-down 24 scraper 25 (with its underside) on the upper side 4a of the workpiece 4.
  • the position of the blank holder 24 shown below will be referred to as the reference position PR of the blank holder 24.
  • the punch 9 is moved further down than the scraper 25 so that the punch 9a passes through the opening in the scraper 25 to machine the workpiece 4.
  • the stamped slug formed in this process is replaced by the (in Fig. 2b not shown) die 11 discharged down.
  • the hold-down 24 thus remains stationary while the punch 9 changes its position S along the lifting axis 15.
  • Fig. 2c the punch 9 in the opening of the blank holder 24 is pulled back so far that the two paragraphs (see. Fig. 2b ) abut each other, wherein the hold-down 24 is still in its reference position PR.
  • the position P of the scraper 25 along the lifting axis 15 is determined by a Weg messengercardi 27, 28, which is part of an in Fig. 1 indicated detection device 26 is.
  • the displacement measuring device 27, 28 comprises a (linear) scale 28 attached to the hold-down 24 and an optical sensor 27 fixedly attached to the housing 2. It is understood that the displacement measuring device 27, 28 may also be used in other ways than in FIG Fig. 2a-d can be shown, for example, the sensor 27 can be attached to the hold-down 24 and the scale 28 on the housing 2. Possibly.
  • a mechanical detection of the position P of the hold-down 24 along the lifting axis 15 can also take place, or a displacement measuring device based on the principle of magnetostriction can be used.
  • the detection device 26 is connected to the path measuring device 27, 28 of the blank holder 24 and with another (not shown) path measuring device for detecting the position P of the punch 9 along the lifting axis 15 in signal-technical connection.
  • the detection device 26 itself is in signal communication with the control device 19.
  • the control device 19 compares the position P of the blank holder 24 detected with the aid of the detection device 26 with the position S of the punch 9. The comparison makes it possible to determine whether the stripper 25 still rests on the upper side 4 a of the workpiece 4 (position S of the punch 9) changes, position P of the blank holder 24 remains the same).
  • the control device 19 stops the punch 9 as soon as it has covered a path along the stroke axis (z-direction), which corresponds to half the thickness d / 2 of the workpiece 4 (with thickness d). Since during the upward movement of the hold-down 24 (and thus the scraper 25) is taken along with the punch 9, and the scraper 25 is in one position stopped or delivered, which corresponds to half the thickness d / 2 of the workpiece 4, ie between the workpiece 4 and the scraper 25 forms a gap with a gap width corresponding to half the workpiece thickness d.
  • the scraper 25 has reached its Ausschiebeposition in which a separated from the workpiece 4 during punching machining workpiece part 4b (in Fig. 2d right of the lifting axis 15) can be spent in a Ausschleusposition eg at the edge of the workpiece table 3.
  • the (rest) workpiece 4 clamped by the collets 7 is displaced by means of the coordinate guide 6 along the support plane 5 of the workpiece table 3, specifically along the in Fig. 2d shown arrow direction.
  • the cut-free workpiece part 4b is thereby pushed out with the aid of the (residual) workpiece 4.
  • the scraper 25 is in this case lifted from the top 4a of the workpiece 4, so that this or the workpiece part 4b can not jam between the scraper 25 and the workpiece table 3. Since the gap formed between the scraper 25 and the workpiece 4 is smaller than the thickness d of the workpiece 4, the workpiece part 4b can not slide over the workpiece 4 during insertion and thus possibly jam or prevent the ejection.
  • the knowledge of the thickness d of the punched machined workpiece 4 is required because the distance is usually dependent on the workpiece thickness d and not larger than the thickness d of the workpiece 4 should be selected.
  • the thickness d of the workpiece 4 is stored in the control device 19 or in the storage means 20.
  • a measurement of the thickness d of the workpiece 4 can also be made during processing.
  • the distance d can basically vary in a value range between 0 xd and 1.0 xd, the distance being more typical Way between about 0.01 xd and 1.0 xd, preferably between about 0.1 xd and 1.0 xd.
  • the punch 9 and the hold-down 24 form a common unit, more precisely, the punch 9 is connected to the hold-down 24 via a coil spring 32.
  • the lower end of the punch 9 is guided in a passage opening of the substantially cylindrical hold-down 24.
  • the helical spring 32 is mounted between a the workpiece 4 remote from the end of the punch 9 forming head plate and a workpiece 4 facing away from the front end of the blank holder 24.
  • the spring action of the helical spring 32 is in this case set such that in a rest position, ie without an external force acting on the punch 9 or the hold-down 24 a lower edge 9b of the punch 9 and a lower edge 25a of the lower end of the blank holder 24 formed plate-shaped scraper 25th finish flush.
  • the in Fig. 3a Although shown wiper 25 is integrally formed with the hold-down 24, but this is not the case in general, since the wiper 25 is a plate-shaped element which is attached by means of suitable fastening means to the hold-24.
  • a part of the drive unit 13 forming plunger 13a is used to perform a punching stroke, which is placed on the top 9c of the punch 9 and presses the punch 9 together with the hold-down 24 down.
  • the punch will be in this case moves down until the bottom of the scraper 25a and the bottom 9b of the punch 9 abut together on the top 4a of the workpiece 4, ie the coil spring 32 remains in this movement in its rest position.
  • a further coil spring 33 which is formed on the housing 2, compressed by a radially outer shoulder 31 a of the blank holder 24.
  • the paragraph 31 a of the blank holder 24 engages a driver plate 31 b of the other coil spring 33.
  • a workpiece part can be delivered in a position in which the scraper 25 occupies a distance d / 2 to the top of the workpiece 4, which corresponds to half the thickness d of the workpiece 4 in the upward movement of the punch 9 and the plunger 13a.
  • the control device 19 which is aware of the position of the plunger 13a along the lifting axis 15 on the basis of a (not shown) Wegmess worn, based on the force measurement in Fig. 3b certain reference position PR of the blank holder 24 and thus of the punch 9 back and positioned the plunger 13a at the corresponding distance (d / 2) from the reference position PR.
  • the (not shown) pushing out the cut workpiece part can in the in Fig. 3d shown position of the scraper 25 on in connection with Fig. 2a-d manner described done.
  • the process reliability when pushing out workpiece parts can be significantly increased because the setting of the predetermined distance relative to the position of the top 4a of the workpiece 4 in the direction the lifting axle 15 takes place.

Claims (14)

  1. Machine-outil (1) affectée à l'usinage par découpe de pièces (4) du type plaques, de préférence des tôles, comprenant :
    un outil de découpage (12), muni d'un poinçon de découpage (9) et d'une matrice de découpage (11) ;
    une unité d'entraînement (13, 14) conçue pour mouvoir ledit poinçon de découpage (9) et ladite matrice de découpage (11) l'un par rapport à l'autre, le long d'un axe de déplacement (15), en vue de perforer la pièce (4) ;
    un serre-flan (24) mobile le long dudit axe de déplacement (15) et doté d'un racloir (25) qui, lors de la perforation de la pièce (4), est en applique contre une face supérieure (4a) de ladite pièce (4) au moyen dudit poinçon de découpage (9) ;
    un dispositif de détection (26) conçu pour détecter, le long dudit axe de déplacement (15), un emplacement de référence (PR) dudit serre-flan (24) auquel ledit racloir (25) est en applique contre ladite face supérieure (4a) de ladite pièce (4) ;
    un dispositif de commande (19), dévolu au positionnement dudit racloir (25) à une distance préétablie (d/2) vis-à-vis dudit emplacement de référence (PR),
    caractérisée par le fait que ladite machine-outil inclut, en outre, un dispositif d'expulsion (6, 7) conçu pour expulser un fragment (4b), détaché par découpe lors de la perforation de la pièce (4), par mouvement imprimé audit fragment (4b) conjointement à ladite pièce (4), le long d'un plan d'appui (5).
  2. Machine-outil selon la revendication 1, incluant par ailleurs : un dispositif d'entraînement (29a, 29b, 31a, 31b), affecté au couplage du mouvement du serre-flan (24) avec le mouvement du poinçon de découpage (9) au cours du soulèvement du racloir (25) l'éloignant de la face supérieure (4a) de la pièce (4).
  3. Machine-outil selon la revendication 2, dans laquelle le dispositif de commande (19) est réalisé pour repérer l'amorce du couplage des mouvements, par une comparaison des emplacements (P, S) du serre-flan (24) et du poinçon de découpage (9) le long de l'axe de déplacement (15).
  4. Machine-outil selon la revendication 2 ou 3, dans laquelle le dispositif de détection (26) comporte un dispositif de mesure (27, 28) dévolu à la détermination de l'emplacement (P) du serre-flan (24) le long de l'axe de déplacement (15).
  5. Machine-outil selon l'une des revendications précédentes, dans laquelle le serre-flan (24) est relié au poinçon de découpage (9) par l'intermédiaire d'un dispositif de précontrainte (32) qui, dans une position de repos, oriente une arête inférieure (9b) dudit poinçon de découpage (9) et une arête inférieure (25a) du racloir (25) avec affleurement réciproque.
  6. Machine-outil selon la revendication 5, dans laquelle le dispositif de détection (26) est réalisé pour détecter l'emplacement de référence (PR) du serre-flan (24) sous l'action d'une force appliquée à une unité d'entraînement (13, 13a), par le poinçon de découpage (9), lors de la mise en applique dudit poinçon de découpage (9) contre la face supérieure (4a) de la pièce (4).
  7. Machine-outil selon l'une des revendications précédentes, dans laquelle le dispositif de commande (19) est réalisé pour préétablir la distance (d/2) en fonction d'une épaisseur (d) de la pièce (4) usinée.
  8. Machine-outil selon l'une des revendications précédentes, dans laquelle le dispositif de détection (26) est doté d'un capteur installé sur le racloir (25), en vue de détecter l'emplacement de référence (PR).
  9. Procédé d'expulsion d'un fragment (4b) de pièce, sur une machine-outil (1) affectée à l'usinage par découpe de pièces (4) du type plaques, notamment de tôles, consistant à :
    mouvoir un poinçon de découpage (9) et une matrice de découpage (11) l'un par rapport à l'autre, le long d'un axe de déplacement (15), en vue de détacher par découpe un fragment (4b) d'une pièce (4), sachant que, durant la perforation de ladite pièce (4) à l'aide dudit poinçon de découpage (9), un racloir (25) implanté sur un serre-flan (24) est en applique contre une face supérieure (4a) de ladite pièce (4) ;
    détecter, le long dudit axe de déplacement (15), un emplacement de référence (PR) dudit serre-flan (24) auquel ledit racloir (25) est en applique contre ladite face supérieure (4a) de ladite pièce (4) ;
    positionner ledit racloir (25) à une distance préétablie (d/2), vis-à-vis dudit emplacement de référence (PR) ; et
    expulser le fragment (4b), détaché de ladite pièce par découpe, par mouvement imprimé audit fragment (4b) conjointement à ladite pièce (4), le long d'un plan d'appui (5).
  10. Procédé selon la revendication 9, dans lequel la distance est préétablie en fonction d'une épaisseur (d) de la pièce (4).
  11. Procédé selon la revendication 10, dans lequel la distance correspond, au moins, à la moitié (d/2) de l'épaisseur (d) de la pièce (4).
  12. Procédé selon l'une des revendications 9 à 11, dans lequel les mouvements du serre-flan (24) et du poinçon de découpage (9) sont couplés au cours du soulèvement du racloir (25) l'éloignant de la face supérieure de la pièce (4).
  13. Procédé selon la revendication 12, dans lequel l'amorce du couplage des mouvements est détectée par une comparaison des emplacements (P, S) du serre-flan (24) et du poinçon de découpage (9), le long de l'axe de déplacement (15).
  14. Procédé selon l'une des revendications 9 à 11, dans lequel le serre-flan (24) est relié au poinçon de découpage (9) par l'intermédiaire d'un dispositif de précontrainte (32) qui, dans une position de repos, oriente une arête inférieure (9b) dudit poinçon de découpage (9) et une arête inférieure (25a) du racloir (25) avec affleurement réciproque ; et dans lequel l'emplacement de référence (PR) dudit serre-flan (24) est détecté sous l'action d'une force appliquée, à une unité d'entraînement (13) de l'outil de découpage (12), lors de la mise en applique dudit poinçon de découpage (9) contre la face supérieure (4a) de la pièce (4).
EP12169979.7A 2012-05-30 2012-05-30 Machine-outil et procédé destinés à l'évacuation d'une partie d'une pièce Active EP2669024B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP12169979.7A EP2669024B1 (fr) 2012-05-30 2012-05-30 Machine-outil et procédé destinés à l'évacuation d'une partie d'une pièce
US13/903,204 US9205481B2 (en) 2012-05-30 2013-05-28 Moving workpiece parts on machine tools
CN201310206674.2A CN103506518B (zh) 2012-05-30 2013-05-29 机床和用于推出工件部分的方法
JP2013113933A JP6141105B2 (ja) 2012-05-30 2013-05-30 工作機械及びワークピース部分を押し出す方法
US14/932,074 US9446442B2 (en) 2012-05-30 2015-11-04 Moving workpiece parts on machine tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12169979.7A EP2669024B1 (fr) 2012-05-30 2012-05-30 Machine-outil et procédé destinés à l'évacuation d'une partie d'une pièce

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EP2669024B1 true EP2669024B1 (fr) 2017-07-05

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DE102015119946B4 (de) * 2015-11-18 2018-10-25 Schuler Pressen Gmbh Schmiedehammer
DE102016102656B4 (de) * 2016-02-16 2024-03-28 Schuler Pressen Gmbh Vorrichtung und Verfahren zur Verarbeitung von metallischen Ausgangsteilen und zum Sortieren von metallischen Abfallteilen
EP3219404B1 (fr) 2016-03-17 2018-06-06 TRUMPF Werkzeugmaschinen GmbH + Co. KG Unite d'usinage et machine-outil destinee au traitement par poinçonnage des pieces usinees, en particulier des toles
CN105921604B (zh) * 2016-05-05 2018-01-09 马鞍山市金申数控模具有限公司 一种板材冲孔模具及其冲孔方法
CN108372227A (zh) * 2018-04-28 2018-08-07 遵义江星机械模具有限公司 汽车外壳冲压模具
CN109013941A (zh) * 2018-08-25 2018-12-18 佛山市顺德区凯硕精密模具自动化科技有限公司 大型中央空调全自动化关节式机器人精密冲压生产线的进料装置
DE102019129787A1 (de) * 2019-11-05 2021-05-06 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Werkzeug und Verfahren zum Bearbeiten von plattenförmigen Werkstücken, insbesondere von Blechen
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US20130319194A1 (en) 2013-12-05
EP2669024A1 (fr) 2013-12-04
US20160052040A1 (en) 2016-02-25
US9446442B2 (en) 2016-09-20
CN103506518A (zh) 2014-01-15
JP6141105B2 (ja) 2017-06-07
JP2013248668A (ja) 2013-12-12
CN103506518B (zh) 2017-10-31
US9205481B2 (en) 2015-12-08

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