EP2093030A1 - Method and device for removing stamping slugs - Google Patents

Abstract

The method involves punching-out a part (16) of a workpiece for producing a punching opening in the workpiece supported at a front side (18) of cylindrical anvils (12) via a punching cutter. A movable base (14) together with the punched part is pulled back into the anvils till into an area of a lateral discharge opening (20) i.e. discharge slit, provided in the area of the anvils. The part that is supported on the movable base is subsequently discharged through the opening by subjecting corresponding force transverse to an axial direction. A slit nozzle extends perpendicular to the opening. An independent claim is also included for a device for removing punching slugs during punching.

Description

The invention relates to a method for the removal of punching waste during punching, in particular knife attachment cutting, in which a part of the workpiece is punched out by a punching blade for producing a punched opening in a supported on the end face of a cylindrical anvil workpiece and the punched-out part before its removal a in the cylindrical anvil axially movable, in particular resilient bottom rests. It further relates to a device according to the preamble of claim 16.

When punching using the so-called knife attachment technique, which is used in particular for the production of small outbreaks, for example in motor vehicle bumpers for the distance sensor or headlight cleaning system, problems arise in connection with the removal and defined disposal of the punched-out part.

Until now, it was common practice to use a specially adapted to the particular case vacuum gripper system for removing the punched part, but now brings the following problems:

Thus, the vacuum gripper for each punched part must be adapted each new. For spatial reasons, a defined removal is not always possible. In addition, the Teilabholung can take place only after the punched workpiece has been removed, which can lead to cycle time increases. Especially for larger workpieces it can also lead to dangerous movements with open roller shutter, since the waste removal is possible only after removal of the large workpiece. However, this contradicts especially corresponding security regulations in the US. Since the vacuum grippers get dirty or the vacuum gripper system can be easily misadjusted mechanically, the reliability leaves something to be desired.

At one of the DE 36 03 627 C2 Known methods used in connection with a Durchtauchschnitt a holding device for the stamped joint, which operates with negative pressure or comprises a separate gripper system. In the process, the punching piece is lifted off the workpiece together with the tool and then removed from the tool. Again, problems may still occur in connection with the disposal of the punching.

The invention has for its object to provide an improved method and an improved device of the type mentioned, with which the aforementioned problems are eliminated. It should be increased in the simplest possible way in particular the reliability in the removal of punching waste.

With regard to the method, this object is achieved in that the movable floor retracted together with the punched part into the region of a provided in the cylindrical anvil lateral ejection opening in the cylindrical anvil and the supported on the retracted floor stamped part then by applying a corresponding Force is ejected transversely to the axial direction through the ejection opening. The movable bottom is preferably arranged in a punching die.

Due to this embodiment of the method, a very reliable removal of the punching waste is ensured in a simple manner.

In this case, the force to be applied for ejecting the punched-out part is preferably applied to the stamped-out part through an anvil opening opposite the ejection opening.

Advantageously, the punched-out part is ejected through the ejection opening by a short force pulse.

According to an expedient practical embodiment of the method according to the invention, the punched-out part is ejected mechanically through the ejection opening. In this case, the punched-out part can be ejected through the ejection opening, in particular via a slide or the like. For ejecting the punched-out part, such a slide can be guided, in particular, from the outside through the anvil opening opposite the ejection opening.

According to an advantageous alternative embodiment of the method according to the invention, the punched-out part is pneumatically ejected through the ejection opening. In this case, the punched-out part can be ejected in particular through a blast of compressed air through the ejection opening.

It is particularly advantageous if the compressed air for ejecting the punched-out part is introduced from the outside through the anvil opening opposite the ejection opening into the anvil.

The ejection opening can be designed in particular slit-like. In this case, the height and width of the ejection slot are preferably selected only slightly larger than the width or height of the punched-out part.

A preferred practical embodiment of the method according to the invention is characterized in that the anvil opening opposite the ejection opening is designed as a slot nozzle and the punched-out part to be ejected is acted upon via this slot nozzle.

If the ejection opening is slit-like as well, then the slot nozzle advantageously extends at least substantially perpendicularly to the ejection slot, whereby canting of the stamped-out part during passage through the ejection slot is avoided.

The passage comprising the ejection opening and the passage opening opposite this is preferably monitored in particular by means of a light barrier and / or the like, whereby the process control is simplified.

When retracting the movable floor, the punched part can be held by vacuum on the ground.

With regard to the device, the object stated above is achieved according to the invention by virtue of the fact that the movable floor together with the stamped-out part can be withdrawn into the cylindrical anvil into the area of a lateral discharge opening provided in the cylindrical anvil and means are provided for this on the withdrawn floor supported punched-part then expel by applying a corresponding force transverse to the axial direction through the discharge opening therethrough.

Preferred embodiments of the device according to the invention are specified in the subclaims.

In particular, when Messeraufsatzschnitt so the punching blade can go against an anvil with wegfahrbarem spring base, the spring base can be slightly larger than the punched opening. The retractable spring base is advantageous because often after stamping an embossing process should be done with the shoulder of the punch and this sufficient clearance must be available below the punch.

After punching, the spring base pulls back down together with the punched-out part.

Now, during a next process step, the punched-out part can be ejected as long as the spring base remains in its lower position, in which the stamped-out part faces the ejection opening. In particular, a slot can be milled out of the fixed anvil, through which the punched-out part is ejected. The diameter of the slot is expediently only slightly larger than the diameter of the waste piece or stamped part. It has been found that such an ejection slot does not affect the stability of the anvil, provided that the usual punching forces and mechanical dimensions are observed.

The removal of the punched-out part is advantageously carried out by a short force pulse, which can be generated either mechanically, for example, with a universal stamp or by a blast of compressed air. This universal removal can be included in the design be and requires only minor adjustments to the punched out or punched out part at startup.

The nozzle in question may be formed in particular as a slot nozzle. In this case, it can extend in particular perpendicular to the ejection slot, whereby tilting of the punched-out part is avoided when passing through the ejection slot.

By monitoring the passage comprising the discharge opening and the passage opening opposite it, for example by means of a light barrier, the process control can be correspondingly simplified. It can thus be monitored in a simple and reliable manner, in particular the removal process.

The slider can be designed in particular in the form of a stamp or the like.

Fig. 1

eine schematische perspektivische Teildarstellung einer beispielhaften Ausführungsform einer Vorrichtung zur Entfernung von Stanzabfällen in einer Phase, in der der das ausgestanzte Teil abstützende verfahrbare Boden noch seine obere Position einnimmt,

Fig. 2

eine schematische perspektivische Teildarstellung der Vorrichtung in einer Phase, in der der verfahrbare Boden seine zurückgezogene Position innerhalb des Ambosses einnimmt und das ausgestanzte Teil bereits teilweise durch die Ausstoßöffnung hindurch ausgestoßen ist, und

Fig. 3

eine schematische perspektivische Teildarstellung der Vorrichtung derselben Phase wie Fig. 2, wobei jedoch auch die der Ausstoßöffnung gegenüberliegende Seite des Ambosses zu erkennen ist.

The invention will be explained in more detail below with reference to an embodiment with reference to the drawing; in this show:

Fig. 1

a schematic partial perspective view of an exemplary embodiment of a device for the removal of punching waste in a phase in which the movable part supporting the punched-out part still occupies its upper position,

Fig. 2

a schematic partial perspective view of the device in a phase in which the movable floor assumes its retracted position within the anvil and the punched-out part already partially ejected through the ejection opening, and

Fig. 3

a schematic partial perspective view of the device of the same phase as Fig. 2 However, wherein the ejection opening opposite side of the anvil can be seen.

The Fig. 1 to 3 show a schematic perspective partial view of an exemplary embodiment of an apparatus 10 for the removal of punching waste during punching, in particular knife attachment cut punching.

The device 10 comprises a cylindrical anvil 12 and an axially movable in this particular, resilient bottom 14. Here, this serves axially, i. in the longitudinal direction of the anvil 12 movable bottom 14 as a support for a part 16 which has been punched out of a supported on an end face 18 of the anvil 12 workpiece by means of a punching blade.

The movable bottom 14 is retractable together with the punched-out part 16 into the region of a lateral discharge opening 20 provided in the cylindrical anvil 12 into the cylindrical anvil 12.

In addition, only schematically indicated means 22 are provided to eject the supported on the retracted bottom 14 punched-16 then by applying a corresponding force transverse to the axial or longitudinal direction of the anvil 12 through the lateral discharge opening 20 therethrough.

As in particular on the basis of Fig. 2 and 3 can be seen, the cylindrical anvil 12 is provided on the opposite side of the ejection opening 20 with an opening 24 through which the force to be ejected for ejecting the punched-out part can be applied to the punched-out part 16.

In this case, this force is applied via the already mentioned force application means 22 which can be attached to the anvil opening 24 provided side of this anvil opening 24 adjacent to the anvil 12, for example with this screwed.

How in particular on the basis of the Fig. 2 and 3 can be seen, the anvil for this purpose may be provided with mounting holes 26, each of which may have an internal thread, in which the Kraftbeaufschlagungsmittel 22 on the anvil 12 holding screws are screwed. As in particular on the basis of Fig. 3 As can be seen, the anvil 12 may be flattened in the region 28 in which the force-applying means 22 are attached to the anvil 12.

The force-applying means 22 may in particular be designed so that the punched-out part 16 is ejected by a short force pulse.

In this case, mechanical and / or pneumatic Kraftbeaufschlagungsmittel 22 can be used.

If, for example, mechanical force-applying means 22 are provided, they may in particular comprise a slide, via which the punched-out part 16 can be ejected through the ejection opening 20. In this case, such a slide for ejecting the punched out Part 16 are passed from the outside through the discharge opening 20 opposite anvil opening 24.

Alternatively or additionally, however, in particular pneumatic force application means 22 may be provided. If appropriate, the pneumatic force-applying means 22 may in particular be designed so that the punched-out part is ejected through the ejection opening 20 via a blast of compressed air.

The compressed air for ejecting the punched-out part 16 is introduced from outside through the anvil opening 24 opposite the ejection opening 20 into the anvil 12.

The ejection opening 20 may be designed in particular slit-like, wherein the height and width of the ejection slot are expediently chosen only slightly larger than the maximum width or height of the punched-out part 16.

Are pneumatic Kraftbeaufschlagungsmittel 22 provided so is, as in particular with reference to the Fig. 2 and 3 it can be seen that the discharge opening 20 opposite anvil opening 24 expediently designed as a slot nozzle. The ejected part 16 is thus acted upon in this case via this slot nozzle with compressed air. In order to avoid tilting of the punched-out part 16 when passing through the preferably slot-like ejection opening 20, the slot nozzle 24 expediently extends perpendicular to the ejection slot 20.

In addition, means for monitoring the discharge opening 20 and this opposite anvil opening 24 comprehensive passage be provided, whereby the process control is facilitated accordingly. In this case, these monitoring means may comprise, for example, a light barrier or the like.

Appropriately, means 30 are provided to hold the punched-out part 16 during retraction of the movable bottom 14 by vacuum on this. As in particular on the basis of Fig. 2 and 3 can be seen, for example, the sprung bottom 14 can be made annular, and the punched-out part 16 are applied through the means 30 through the annular bottom 14 through vacuum.

For controlling and / or regulating the movements of the particular resilient bottom 14, the means 30 for applying the vacuum, the force application means 22, and / or the monitoring means comprising, for example, a light barrier or the like, a correspondingly designed control and / or regulating device can be provided. This control and / or regulating device may in particular be integrated into a control and / or regulating device provided for controlling and / or regulating the remaining tool part, in particular the punch and the punching blade.

While in the Fig. 1 the device 10 is shown in a phase in which the movable bottom 14 supporting the punched-out part 16 still assumes its upper position, the device 10 is in the Fig. 2 and 3 each shown in a phase in which the movable bottom 14 already occupies its retracted position, wherein the punched-out part 16 is already partially ejected through the ejection opening or the ejection slot 20 therethrough.

LIST OF REFERENCE NUMBERS

10

contraption

12

cylindrical anvil

14

Floor, in particular spring floor

16

punched out part

18

front

20

lateral ejection opening, ejection slot

22

force loading

24

Anvil opening, slot nozzle

26

fastening opening

28

fastening area

30

Means for applying a vacuum

Claims (15)

Method for removing punching waste during punching, in particular knife attachment cut punching, in which a part (16) of the workpiece is punched out by means of a punching blade for producing a punched opening in a workpiece supported on the end face (18) of a cylindrical anvil (12) and the punched out punched part Part (16) rests on a in the cylindrical anvil (12) axially movable, in particular resilient bottom (14) before its removal,
characterized,
in that the displaceable bottom (14) together with the stamped-out part (16) retracts into the cylindrical anvil (12) into the area of a lateral discharge opening (20) provided in the cylindrical anvil (12) and supports it on the retracted bottom (14) punched out part (16) is then ejected by applying a corresponding force transverse to the axial direction through the discharge opening (20) therethrough. Method according to claim 1,
characterized,
that applied for the ejection of the punched part (16) by a force of the ejection opening (20) opposite the anvil opening (24) is passed is applied to the punched-out portion (16), and / or
that the stamped out part (16) is discharged by a short force pulse through the discharge opening (20) therethrough. Method according to one of the preceding claims,
characterized,
that the punched-out portion (16) mechanically through the discharge opening (20) is discharged through, wherein preferably the punched out part (16) via a slide through the discharge opening (20) is ejected through and thereby the slider preferably for ejecting the stamped part (16 ) is guided from the outside through the anvil opening (24) opposite the ejection opening (20). Method according to claim 1 or 2,
characterized,
that the punched out part (16) is pneumatically ejected through the ejection opening (20), wherein preferably the punched out part (16) is ejected through the ejection opening (20) via a blast of compressed air, and
in that preferably the compressed air for ejecting the stamped-out part (16) is introduced from outside through the anvil opening (24) opposite the ejection opening (20) into the anvil (12). Method according to one of the preceding claims,
characterized,
that the ejection opening (20) is slit-like, wherein preferably height and width of the ejection slot (20) are only slightly larger than the width or height of the punched-out part (16) are selected. Method according to one of the preceding claims,
characterized,
in that the anvil opening (24) lying opposite the ejection opening (20) is designed as a slot nozzle and the punched-out part (16) to be ejected is acted upon via this slot nozzle, wherein preferably the ejection opening (20) is slit-like and the slot nozzle (24) is at least in the Substantially perpendicular to the ejection slot (20). Method according to one of the preceding claims,
characterized,
that the ejection opening (20) and the opposite thereto anvil opening (24) comprising passage is controlled in particular by means of a light barrier and / or the like, and / or
that the punched-out part (16) is held by the retraction of the movable bottom (14) by vacuum on this. Device (10) for the removal of punching waste during punching, in particular knife attachment cut punching, with a cylindrical anvil (12) and an axially movable in this particular resilient bottom (14), which serves as a support for a part (16), the a workpiece supported on an end face (18) of the anvil (12) has been punched out by means of a punching cutting edge, in particular for carrying out the method according to one of the preceding claims,
characterized,
that the movable bottom (14) together with the punched-out part (16) into the region of a lateral discharge opening (20) provided in the cylindrical anvil (12) into the cylindrical anvil (12) is retractable and means (22) are provided for subsequently ejecting the punched-out portion (16) supported on the recessed bottom (14) by exerting a corresponding force transverse to the axial direction through the discharge opening (20). Device according to claim 8,
characterized,
in that the cylindrical anvil (12) is provided on the side opposite the ejection opening (20) with an opening (24) through which the force to be expelled for ejecting the stamped-out part (16) can be applied to the stamped-out part (16), and or
in that the force-applying means (22) are designed such that the punched-out part is ejected by a short force pulse. Device according to claim 8 or 9,
characterized,
that mechanical force loading means (22) are provided, wherein preferably the mechanical force loading means (22) comprise a slider with which the stamped part (16) through the ejection orifice can be ejected while the slider preferably for ejecting the stamped part (16) from the outside through which the discharge opening (20) opposite the anvil opening (24) is guided. Device according to claim 8 or 9,
characterized,
that pneumatic force application means (22) are provided, wherein preferably the pneumatic force application means (22) are designed so that the punched-out part is ejected through the ejection opening (20) via a blast of compressed air, and
in that preferably the compressed air for ejecting the stamped-out part (16) can be inserted from the outside through the anvil opening (24) opposite the ejection opening (20) into the anvil (12). Device according to one of the preceding claims,
characterized,
that the ejection opening (20) is slit-like, wherein preferably height and width of the ejection slot (20) are only slightly larger than the maximum width or height of the punched-out part (16) are selected. Device according to one of the preceding claims,
characterized,
in that the anvil opening (24) lying opposite the ejection opening (20) is designed as a slot nozzle and the punched-out part (16) to be ejected can be acted upon via this slot nozzle, the ejection opening preferably being slit-like and the slot nozzle (24) being at least substantially perpendicular to the ejection slot (20) extends. Device according to one of the preceding claims,
characterized,
in that means are provided for monitoring the passage comprising the ejection opening (20) and the opposing anvil opening (24), and / or
in that the monitoring means comprise a light barrier. Device according to one of the preceding claims,
characterized,
in that means (30) are provided for vacuum-retaining the stamped-out part (16) when retracting the movable bottom (14).

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