EP2110266A2 - Method and device for creating a marking in a workpiece surface through impression - Google Patents
Method and device for creating a marking in a workpiece surface through impression Download PDFInfo
- Publication number
- EP2110266A2 EP2110266A2 EP09004804A EP09004804A EP2110266A2 EP 2110266 A2 EP2110266 A2 EP 2110266A2 EP 09004804 A EP09004804 A EP 09004804A EP 09004804 A EP09004804 A EP 09004804A EP 2110266 A2 EP2110266 A2 EP 2110266A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- embossing
- needle
- workpiece surface
- depth
- distance
- 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
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/0004—Machines or apparatus for embossing decorations or marks, e.g. embossing coins characterised by the movement of the embossing tool(s), or the movement of the work, during the embossing operation
- B44B5/0019—Rectilinearly moving embossing tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B3/00—Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings
- B44B3/009—Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings using a computer control means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B3/00—Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings
- B44B3/02—Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two- dimensionally for carving, engraving, or guilloching shallow ornamenting or markings wherein plane surfaces are worked
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/0095—Machines or apparatus for embossing decorations or marks, e.g. embossing coins using computer control means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/02—Dies; Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/22—Removing surface-material, e.g. by engraving, by etching
- B44C1/222—Removing surface-material, e.g. by engraving, by etching using machine-driven mechanical means
Definitions
- the invention relates to a method and an apparatus of the genera specified in the preambles of claims 1 and 5.
- embossing depth has scoring or groove depth z. B. is 0.2 mm.
- embossing depth is practically impossible and the embossing devices commonly used not ensure that a given embossing depth is actually achieved and adhered to, methods and devices of the types described are required by means of which the embossing depth automatically determined and compliance with a preselected embossing depth are automatically ensured can.
- the technical problem underlying the invention is to further develop the method and the device of the generic types described at the beginning in such a way that a rapid determination taking place during the stamping process and with high accuracy is carried out the embossing depth is possible and thus incorrectly marked workpieces are largely avoided.
- the invention has the advantage that the distance sensor, since it is moved together with the needle perpendicular and parallel to the workpiece surface, constantly indicates its distance from the workpiece surface during the embossing process, including one at the beginning of the embossing process and the rest of the embossing needle At the same time, the reference value determined on the workpiece surface supplies an exact measure of the current embossing depth. The closer the Abstandssenor is arranged on the embossing needle, the more accurate is the determined embossing depth, since in this way a possible deflection of the workpiece is neutralized. Finally, the influence of any wear of the embossing needle can be largely compensated by determining a new reference value before the generation of each character.
- Fig. 1 shows a device in the form of an embossing unit 1 for producing markings according to the method of the so-called scratch marking.
- the embossing unit 1 includes a base frame, of which in Fig. 1 only an upper cover plate 2, a parallel side wall 2a and a side wall 3 are shown.
- the base frame is in the usual way on a handling system such.
- B. a robot arm mounted in order to put the embossing unit 1 to that point of a workpiece surface can, at which a mark is to be attached.
- At the intermediate wall 2a of the base frame at least one parallel to a Y-axis of an imaginary coordinate system extending guide 4 is fixed, along which a only schematically indicated Y-slide 5 back and forth.
- At an underside of the Y-carriage 5 at least one parallel to the X-axis of the imaginary coordinate system extending guide 6 is mounted, along which an X-carriage 7 is mounted back and forth.
- the movement of the Y-carriage 5 is z. B. by means of a base frame attached to the stepping motor 8, by means of a toothed belt pulley 9 and a timing belt, not shown, a toothed belt pulley 10 drives, which sits on a threaded spindle which projects through a threaded bore of the Y-carriage 5.
- the X-carriage 7 z. B.
- a stepping motor 11 which is fixed by means of a mounting plate 12 on the Y-carriage 5 and a toothed belt pulley 14 which can put a toothed belt pulley 15 in revolutions by means of a toothed belt, not shown.
- This is mounted on a rotatably mounted in the mounting plate 11 threaded spindle 16 which extends through a threaded bore of the X-carriage 7.
- a stamping or needle head 17 is fixed, in which an embossing needle 18 is movably mounted and parallel to the Z-axis of the imaginary coordinate system can be moved back and forth.
- the embossing unit 1 described so far can be designed in such a way as corresponds to the general state of the art. Therefore, in particular, the stepping motors 8 and 11, as is common in the case of XY tables, can be rotated in rotation with control units, not shown, in such a way that the embossing needle 18 in the X and Y directions along the surface of an in Fig. 1 Unillustrated workpiece is moved to write one or more characters and form by a scratching operation in the workpiece surface. Since such controls are familiar to those skilled in the art, their detailed description is omitted.
- FIGS. 2 and 3 show details of the attached to the X-carriage 7 needle head 17.
- This contains in an upper part of a holding plate 19, on the underside of a housing 20 is fixed, which surrounds a preferably cylindrical cavity 21.
- a likewise preferably cylindrical piston 22 is slidably mounted in the Z direction, which forms a cylinder / piston arrangement together with the housing 20.
- An in Fig. 3 the upper end of the cavity 21 is closed by a cover wall 24 having a through opening 23.
- the opening 23 serves, via a connected to it, not shown line a pressure medium, preferably to introduce compressed air into the cavity 21 and thereby act on the piston 22.
- a bottom part 25 is fixed, which has a coaxial with the piston 22, extending in the Z direction guide bore 26.
- guide lugs 27 are slidably mounted with sliding fit, which are provided on a piston 22 fixed to the piston rod 28, at the lower end of the embossing needle 18 is preferably secured easily replaceable (see also FIGS. 5 and 6 ).
- a loose surrounding the piston rod 28 ring 29 rests on a formed at a transition from the cavity 21 to the guide bore 26 shoulder and supports the lower end of a compression spring 30, the upper end of the piston 22 abuts.
- a radially extending bracket 31 is fixed, which by a lateral recess 32 (FIG. Fig. 2 ) of the bottom part 25 protrudes to the outside.
- a parallel to the embossing needle 18 extended distance sensor 33 is fixed, wherein the recess 32 is formed so that the holder 31 and thus the distance sensor 33 can join all occurring in the Z direction movements of the embossing needle 18.
- the lower end of the distance sensor 33 has a distance A from the underside or tip 18a of the embossing needle 18, (FIG. Fig. 3 ) which is at least as large as corresponds to the desired embossing depth of the characters to be produced.
- the distance A is also so much greater than the embossing depth, as corresponds to a tolierbaren wear of the embossing tip 18a in use. It is thereby achieved that the distance sensor 33 is always arranged above a workpiece surface and therefore does not touch it, even if the embossing needle 18 is pressed into the workpiece surface with the maximum embossing depth.
- Fig. 4 shows a workpiece 34 with a surface to be labeled 34a and in To simplify the deposition of the embossing unit 1 by means of a robot arm od.
- the embossing needle 18 by means of X and Y slides not shown here 7 and 5 parallel to the surface 34a along a to be provided with signs Labeling zone 35 can be moved back and forth.
- the bottom part 25 expediently penetrates through a recess 36 formed in a bottom of the base frame.
- a sensor 37 is arranged, the z. B.
- the embossing unit 1 is an optical sensor, emits a directed onto the surface 34 a light beam and receives a reflected light from the surface 34 a.
- the sensor signals obtained in this way can be determined in the manner of a motion detector, whether the embossing unit 1 moves during a stamping phase in the X and / or Y-direction relative to the workpiece 34 or if no such relative movement takes place as required. If necessary, the embossing process can be interrupted and provided for a shift-free storage of the embossing unit 1 on the workpiece 34.
- FIGS. 5 and 6 show how, by means of the distance sensor 33, an exact measurement of the embossing depth can be made if the surface 34a is marked by scratches with a mark 34b (FIG. Fig. 6 ) should be provided.
- the embossing needle 18 is first characterized in that the piston 22 ( Fig. 3 ) is acted upon by the opening 23 through a first, relatively low pressure, advanced in the Z direction so far that it sits with its tip 18a on the surface 34a, without penetrating into it. Reaching this state can z. B. by means of a sensor, not shown, for. B.
- a speed sensor an electrical, the contact between the tip 18 a and the surface 34 a indicative contact sensor od.
- the pressure of the printing medium can also be chosen so that, although a touch, but no penetration of the embossing needle 18 in the surface 34 a is possible, and a predetermined time to wait, within which the Embossing needle 18 is securely placed on the workpiece surface 34a.
- the final state obtained is in Fig. 5 in which the distance sensor 33 (or its underside facing the surface 34a) shows a first distance L1 from the workpiece surface 34a.
- the pressure of the pressure medium introduced through the opening 23 is now increased so much that the tip 18a of the embossing needle 18 correspondingly Fig. 6 penetrates into the surface 34a to a desired embossing depth L3.
- the difference L3 L1-L2 at each position of the image character 34b gives the current actual value of the embossing depth at. Consequently, it is possible according to the invention to not only permanently measure the current embossing depth L3 during an embossing process, but also to modify it, if necessary, by controlling the pressure acting on the piston 22. A provision of the embossing needle 18 in a direction away from the workpiece surface 34 a direction is effected in each case by the compression spring 30.
- the control device includes a regulator 38, a connected thereto adjusting device 39, for example in the form of a pressure control valve, which in one with the opening 23 (FIG. Fig. 1 ) is connected and controls the pressure of the force acting on the piston 22 pressure medium, and acted upon by the actuator 39 embossing needle 18 which is fixedly connected to the distance sensor 33.
- the signal output by the distance sensor 33 is supplied to a comparator 40, in which it is compared with a predetermined, output from a setpoint generator 41 setpoint.
- the difference signal resulting from the comparison is supplied to the controller 38.
- control device preferably operates as follows:
- L1 eg 1 mm
- the embossing needle 18 is lifted by venting the cylinder / piston assembly 21, 22 by means of the compression spring 30 from the workpiece surface 34a and successively brought to the starting points for the next character, the process steps described are respectively repeated accordingly.
- a particular advantage of the invention is therefore that the determination of the reference value L1 can be made anew before the embossing of each individual character.
- the embossing needle 18 slightly wears during embossing of a character or the distance between the tip 18a and the bottom of the sensor 33 should have changed for some reason, the next character is still scribed with the predetermined embossing depth, since in this case the reference value L1 changes accordingly and the differential value formed in the setpoint generator 41 is adjusted accordingly. In this way, the embossing depth L3 at least as long as kept absolutely constant until the embossing needle 18 is worn to a no longer tolerable value.
- a further advantage of the invention results from the fact that any deflections of the workpiece 34 are also included in the formation of the reference value L1. Namely, if the workpiece 34 is slightly deflected by the embossing needle 18 before it penetrates into the surface 34a, the reference value L1 required for the control does not change because the distance sensor 33 constantly participates in the movements of the embossing needle 18. Therefore, it is particularly advantageous if the distance sensor 33 as close as possible, d. H. as close as the installation conditions permit, is arranged next to the embossing needle 18. Any deformations of the workpiece 34 then have at most a negligible effect on the reference value L1.
- the embossing process is preferably interrupted in order to preclude the attachment of defective markings on the workpiece surface 34a.
- FIGS. 9 and 10 show an alternative embodiment of a device for detecting relative movements between the embossing unit 1 and the workpiece 34 during a stamping operation.
- Fig. 4 rejects the device FIGS. 9 and 10 a z. B. attached to the side wall 3 a, mechanical button 45.
- This is pivotally mounted with a ball joint 46 in a connected to the side wall 3a holder 47 and supported on the workpiece surface 34a lowered embossing needle 18 by means of a rubber buffer 48 on the workpiece surface 34a.
- the embossing unit 1 is supported by means of at least one support foot 49 on the workpiece surface 34a.
- Relative displacements of the embossing unit 1 and of the workpiece 34 in the X and / or Y direction therefore result in a pivoting of the probe 45 in the ball joint 46.
- This pivoting is by means of a z. B. inductively acting, the top of the probe 45 associated sensor 50 is scanned and used when exceeding the preselected tolerance range for switching off the embossing process.
- the invention is not limited to the described embodiment, which could be modified in many ways. This applies in particular to the type and design of the various sensors.
- the distance sensor 33 which is particularly preferably an inductively or according to the eddy current principle working sensor that provides analog or digital distance signals, for example, a capacitive or optical sensor could be provided.
- a capacitive or optical sensor could be provided.
- the statement “attachment of the distance sensor 33 to the embossing needle 18" in the description and in the following claims include the case that the distance sensor 33 is not with the embossing needle 18 itself, but with a receiving this holder, z. B. the piston rod 28 ( Fig. 3 ), connected is.
- the distance sensor 33 since he must work without contact, with its underside at least as much above the tip 18a of the embossing needle 18 to order that the distance measurement also works when the embossing needle 18 is worn to a maximum tolerable level ,
- the control device after Fig. 7 can z. B. be modified in that between the distance sensor 33 and the comparator 40 a dashed line indicated subtraction stage 51 is switched, in which the difference between the reference value L1 and after switching on the control device currently obtained distance L2 is formed, the actual value of the embossing depth L3 corresponds. In this case, only one desired value for the embossing depth L3 would be specified by the setpoint generator 41.
- the embossing depth L3 is the actual control variable, which is to be controlled constantly. It is also clear that the described monitoring of the various functions and the regulation of the embossing depth L3 are preferably carried out with the aid of microprocessor controls or the like, and thus fully automatically. Finally, it is understood that the various features may be applied in combinations other than those described and illustrated.
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Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung der in den Oberbegriffen der Ansprüche 1 und 5 angegebenen Gattungen.The invention relates to a method and an apparatus of the genera specified in the preambles of
Die Erzeugung von Zeichen wie z. B. alphanumerischen Zeichen in Werkstückoberflächen dient beispielsweise in der Automobilindustrie dem Zweck, Werkstücke wie Fahrgestelle, Motoren od. dgl. mit weitgehend fälschungssicheren Markierungen in Form von Beschriftungen oder sonstigen Kennzeichnungen zu versehen. Als Prägewerkzeuge werden hierfür insbesondere Prägenadeln verwendet, die die Zeichen entweder matrixförmig aus einer Mehrzahl von Punkten zusammensetzen (Nadelprägen) oder in Klarschrift darstellen, indem die Prägenadel in die Werkstückoberfläche gedrückt und dann quer dazu bewegt wird (Ritzmarkieren oder Prägen durch Druckumformen).The generation of characters such. As alphanumeric characters in workpiece surfaces used for example in the automotive industry the purpose of workpieces such as chassis, motors od. Like. To provide with largely forgery-proof markers in the form of labels or other markings. As embossing tools embossing needles are used for this purpose, either the characters composed in a matrix of a plurality of points (needle embossing) or in plain writing by the embossing needle is pressed into the workpiece surface and then moved across it (scratch marking or embossing by pressure forming).
In den beiden zuletzt genannten Fällen, in denen die einzelnen Zeichen als durchgehende, im Wesentlichen V-förmige Ritzlinien oder Rillen ausgebildet sind, wird zur Erzielung eines gut lesbaren, gleichförmigen Schriftbildes zunehmend gefordert, dass die Zeichen eine durchgehend gleichförmige, nachfolgend kurz als Prägetiefe bezeichnete Ritz- oder Rillentiefe aufweisen, die z. B. 0,2 mm beträgt. Da eine visuelle Endkontrolle der Prägetiefe praktisch unmöglich ist und die üblicherweise verwendeten Prägevorrichtungen nicht sicherstellen, dass eine vorgegebene Prägetiefe auch tatsächlich erreicht und eingehalten wird, werden Verfahren und Vorrichtungen der eingangs bezeichneten Gattungen benötigt, mittels derer die Prägetiefe automatisch ermittelt und die Einhaltung einer vorgewählten Prägetiefe automatisch sichergestellt werden kann.In the two last-mentioned cases in which the individual characters are formed as continuous, substantially V-shaped scribe lines or grooves, in order to achieve a well readable, uniform typeface, it is increasingly required that the characters have a uniform, hereinafter abbreviated as embossing depth Have scoring or groove depth z. B. is 0.2 mm. As a visual Final check of the embossing depth is practically impossible and the embossing devices commonly used not ensure that a given embossing depth is actually achieved and adhered to, methods and devices of the types described are required by means of which the embossing depth automatically determined and compliance with a preselected embossing depth are automatically ensured can.
Bekannte Verfahren und Vorrichtungen der eingangs bezeichneten Gattungen verwenden zur Ermittlung der Prägetiefe durchweg optische Mittel (z. B.
Möglich wäre schließlich eine Überprüfung der geprägten Kennzeichnungen mit Hilfe einer Kamera. Hierdurch kann jedoch in der Regel nur festgestellt werden, ob die gewünschten Zeichen tatsächlich vorhanden sind. Außerdem wirken sich z.B. vorhandene Schmutzteilchen (Auswurf), wechselnde Lichtverhältnisse und unterschiedliche Farben der Werkstücke ungünstig auf die Messergebnisse aus, weshalb auch mit diesen Verfahren und Vorrichtungen eine schlechte Verfügbarkeit erzielt wird.Finally, it would be possible to check the embossed markings with the help of a camera. As a result, however, can usually only be determined whether the desired characters are actually present. In addition, e.g. existing dirt particles (ejection), changing light conditions and different colors of the workpieces unfavorable to the measurement results, which is why poor availability is achieved with these methods and devices.
Ausgehend davon liegt der Erfindung das technische Problem zugrunde, das Verfahren und die Vorrichtung der eingangs bezeichneten Gattungen so weiterzubilden, dass eine schnelle, während des Prägevorgangs und mit hoher Genauigkeit erfolgende Ermittlung der Prägetiefe möglich ist und dadurch fehlerhaft gekennzeichnete Werkstücke weitgehend vermieden werden.Proceeding from this, the technical problem underlying the invention is to further develop the method and the device of the generic types described at the beginning in such a way that a rapid determination taking place during the stamping process and with high accuracy is carried out the embossing depth is possible and thus incorrectly marked workpieces are largely avoided.
Gelöst wird dieses Problem erfindungsgemäß mit den kennzeichnenden Merkmalen der Ansprüche 1 und 5.This problem is solved according to the invention with the characterizing features of
Die Erfindung bringt den Vorteil mit sich, dass der Abstandssensor, da er zusammen mit der Nadel senkrecht und parallel zur Werkstückoberfläche bewegt wird, während des Prägevorgangs ständig seinen Abstand von der Werkstückoberfläche anzeigt, der unter Einbeziehung eines zu Beginn des Prägevorgangs und beim Aufliegen der Prägenadel auf der Werkstückoberfläche ermittelten Referenzwertes gleichzeitig ein genaues Maß für die aktuelle Prägetiefe liefert. Je näher der Abstandssenor an der Prägenadel angeordnet wird, umso genauer ist die ermittelte Prägetiefe, da auf diese Weise eine etwaige Durchbiegung des Werkstücks neutralisiert wird. Schließlich kann der Einfluss eines etwaigen Verschleißes der Prägenadel dadurch weitgehend kompensiert werden, dass vor der Erzeugung eines jeden Zeichens ein neuer Referenzwert ermittelt wird.The invention has the advantage that the distance sensor, since it is moved together with the needle perpendicular and parallel to the workpiece surface, constantly indicates its distance from the workpiece surface during the embossing process, including one at the beginning of the embossing process and the rest of the embossing needle At the same time, the reference value determined on the workpiece surface supplies an exact measure of the current embossing depth. The closer the Abstandssenor is arranged on the embossing needle, the more accurate is the determined embossing depth, since in this way a possible deflection of the workpiece is neutralized. Finally, the influence of any wear of the embossing needle can be largely compensated by determining a new reference value before the generation of each character.
Weitere vorteilhafte Merkmale der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous features of the invention will become apparent from the dependent claims.
Die Erfindung wird nachfolgend in Verbindung mit den beiliegenden Zeichnungen an einem Ausführungsbeispiel näher erläutert. Es zeigen in unterschiedlichen Maßstäben:
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Fig. 1 eine schematische, perspektivische Ansicht einer Prägeeinheit zur Durchführung von Ritzmarkierungen; -
Fig. 2 eine perspektivische Ansicht eines Nadelkopfes der Prägeeinheit nachFig. 1 ; -
Fig. 3 den Nadelkopf nachFig. 2 in einer teilweise aufgebrochenen und geschnittenen Darstellung; -
Fig. 4 eine perspektivische Darstellung einer mit einem optischen Sensor versehenen Einrichtung zur Erfassung von Relativbewegungen zwischen der Prägeeinheit und den Werkstück; -
Fig. 5 und 6 das der Erfindung zugrundeliegende Messprinzip für die Prägestufe anhand je einer Vorderansicht der Prägenadel und eines Abstandssensors; -
Fig. 7 eine Regeleinrichtung zur Regelung der Prägetiefe mittels der Prägeeinheit nachFig. 1 bis 5 ; -
Fig. 8 eine Einrichtung zur Überwachung der Bewegung der Prägenadel parallel zu einer Werkstückoberfläche; und -
Fig. 9 und 10 eine perspektivische Darstellung und eine Vorderansicht einer mit einem mechanischen Taster versehenen Einrichtung zur Erfassung von Relativbewegungen zwischen der Prägeeinheit und dem Werkstück.
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Fig. 1 a schematic, perspective view of a stamping unit for performing scribe marks; -
Fig. 2 a perspective view of a needle head of the embossing unit according toFig. 1 ; -
Fig. 3 follow the needle headFig. 2 in a partially broken and cut representation; -
Fig. 4 a perspective view of a device provided with an optical sensor for detecting relative movements between the embossing unit and the workpiece; -
FIGS. 5 and 6 the measurement principle underlying the invention for the embossing stage based on a respective front view of the embossing needle and a distance sensor; -
Fig. 7 a control device for controlling the embossing depth by means of the embossing unit according toFig. 1 to 5 ; -
Fig. 8 means for monitoring movement of the embossing needle parallel to a workpiece surface; and -
FIGS. 9 and 10 a perspective view and a front view of a device provided with a mechanical button for detecting relative movements between the embossing unit and the workpiece.
An der Unterseite des X-Schlittens 7 ist ein Präge- oder Nadelkopf 17 befestigt, in dem eine Prägenadel 18 beweglich gelagert ist und parallel zur Z-Achse des gedachten Koordinatensystems hin- und herbewegt werden kann.At the bottom of the
Die insoweit beschriebene Prägeeinheit 1 kann im Übrigen so ausgebildet sein, wie dem allgemeinen Stand der Technik entspricht. Daher können insbesondere die Schrittmotoren 8 und 11, wie dies bei XY-Tischen allgemein üblich ist, mit nicht dargestellten Steuereinheiten derart in Umdrehungen versetzt werden, dass die Prägenadel 18 in X- und Y-Richtung entlang der Oberfläche eines in
Auf der von der Öffnung 23 abgewandten Seite des Kolbens 22 ist ein Bodenteil 25 befestigt, das eine mit dem Kolben 22 koaxiale, in Z-Richtung erstreckte Führungsbohrung 26 aufweist. In der Führungsbohrung 26 sind mit Gleitsitz Führungsansätze 27 verschiebbar gelagert, die an einer am Kolben 22 befestigten Kolbenstange 28 vorgesehen sind, an deren unterem Ende die Prägenadel 18 vorzugsweise leicht auswechselbar befestigt ist (vgl. auch
In einem unteren Abschnitt der Kolbenstange 28 ist eine radial erstreckte Halterung 31 befestigt, die durch eine seitliche Aussparung 32 (
In einem nächsten Verfahrensschritt wird jetzt der Druck des durch die Öffnung 23 eingeführten Druckmediums so stark vergrößert, dass die Spitze 18a der Prägenadel 18 entsprechend
Bei einem derzeit für am besten gehaltenen Ausführungsbeispiel der Erfindung wird die Differenz L3 = L1 - L2 als Regelgröße für eine den Druck auf den Kolben 22 festlegende, in
Beim Betrieb der Prägeeinheit 1 arbeitet die Regeleinrichtung vorzugsweise wie folgt:During operation of the
Vor Beginn der Prägung eines Zeichens 34b wird die Prägenadel 18 zunächst unter Steuerung der Schrittmotoren 8 und 11 wie beschrieben vorzugsweise dort auf die Werkstückoberfläche 34a aufgesetzt, wo der Prägevorgang beginnen soll. Der sich dabei gemäß
Nach Beendigung des Prägevorgangs wird die Prägenadel 18 durch Entlüftung der Zylinder/Kolben-Anordnung 21, 22 mittels der Druckfeder 30 von der Werkstückoberfläche 34a abgehoben und nacheinander an die Startpunkte für die nächsten Zeichen gebracht, wobei die beschriebenen Verfahrensschritte jeweils entsprechend wiederholt werden. Ein besonderer Vorteil der Erfindung besteht daher darin, dass die Ermittlung des Referenzwertes L1 vor der Prägung eines jeden einzelnen Zeichens neu vorgenommen werden kann. Selbst wenn sich dabei die Prägenadel 18 beim Prägen eines Zeichens geringfügig abnutzt oder sich der Abstand zwischen der Spitze 18a und der Unterseite des Sensors 33 aus irgendeinem Grund geändert haben sollte, wird das nächste Zeichen dennoch mit der vorgegebenen Prägetiefe geritzt, da sich in diesem Fall der Referenzwert L1 entsprechend ändert und der im Sollwertgeber 41 gebildete Differenzwert entsprechend angepasst wird. Auf diese Weise kann die Prägetiefe L3 zumindest solange absolut konstant gehalten werden, bis die Prägenadel 18 auf einen nicht mehr tolerierbaren Wert abgenutzt ist.After completion of the embossing process, the
Ein weiterer Vorteil der Erfindung ergibt sich dadurch, dass in die Bildung des Referenzwertes L1 auch etwaige Durchbiegungen des Werkstücks 34 eingehen. Sollte das Werkstück 34 nämlich von der Prägenadel 18, bevor diese in die Oberfläche 34a eindringt, geringfügig durchgebogen werden, dann ändert sich dadurch der für die Regelung benötigte Referenzwert L1 nicht, da der Abstandsensor 33 die Bewegungen der Prägenadel 18 ständig mitmacht. Daher ist es besonders vorteilhaft, wenn der Abstandsensor 33 möglichst dicht, d. h. so dicht, wie es die Einbauverhältnisse zulassen, neben der Prägenadel 18 angeordnet wird. Etwaige Verformungen des Werkstücks 34 wirken sich dann allenfalls in vernachlässigbarer Weise auf den Referenzwert L1 aus.A further advantage of the invention results from the fact that any deflections of the
Durch die Erfindung kann somit bereits während einer Prägephase sichergestellt werden, dass eine vorgebene Prägetiefe L3 auch tatsächlich erreicht und eingehalten wird. Nimmt die Prägetiefe L3 aus irgendeinem Grund einen außerhalb eines vorgegebenen Toleranzbereichs liegenden Wert an, was durch den Vergleicher 40 überwacht werden kann, wird der Prägevorgang vorzugsweise unterbrochen, um das Anbringen fehlerhafter Markierungen auf der Werkstückoberfläche 34a grundsätzlich auszuschließen.As a result of the invention, it can thus be ensured even during an embossing phase that a predetermined embossing depth L3 is actually achieved and maintained. If, for some reason, the embossing depth L3 assumes a value outside a predetermined tolerance range, which can be monitored by the
Die anhand der
In einer Weiterbildung der Erfindung wird schließlich auch sichergestellt, dass die verschiedenen Zeichen an den vorgegebenen X- und Y-Positionen angebracht und wie vorgesehen ausgebildet werden. Hierzu ist vorgesehen, an den Führungen 4 und 6 selbst oder einem dazu parallelen Teil des Grundrahmens oder des Y-Schlittens 5, wie in
Die Erfindung ist nicht auf das beschriebene Ausführungsbeispiel beschränkt, das auf vielfache Weise abgewandelt werden könnte. Das gilt insbesondere für die Art und Ausbildung der verschiedenen Sensoren. Anstelle des Abstandsensors 33, der besonders bevorzugt ein induktiv oder nach dem Wirbelstromprinzip arbeitender Sensor ist, der analoge oder digitale Abstandssignale liefert, könnte beispielsweise ein kapazitiv oder optisch arbeitender Sensor vorgesehen werden. Dabei soll die Angabe "Befestigung des Abstandsensors 33 an der Prägenadel 18" in der Beschreibung und in den nachfolgenden Ansprüchen natürlich auch den Fall einschließen, dass der Abstandsensor 33 nicht mit der Prägenadel 18 selbst, sondern mit einer diese aufnehmenden Halterung, z. B. der Kolbenstange 28 (
Claims (17)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008019342A DE102008019342A1 (en) | 2008-04-15 | 2008-04-15 | Method and device for producing a character in a workpiece surface by embossing |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2110266A2 true EP2110266A2 (en) | 2009-10-21 |
EP2110266A3 EP2110266A3 (en) | 2012-09-05 |
EP2110266B1 EP2110266B1 (en) | 2014-06-25 |
Family
ID=40888120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP09004804.2A Not-in-force EP2110266B1 (en) | 2008-04-15 | 2009-04-01 | Method and device for creating a marking in a workpiece surface through impression |
Country Status (4)
Country | Link |
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US (1) | US8356500B2 (en) |
EP (1) | EP2110266B1 (en) |
CN (1) | CN101590773A (en) |
DE (2) | DE202008017427U1 (en) |
Cited By (2)
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DE102016120603A1 (en) | 2015-10-27 | 2017-04-27 | ATN Hölzel GmbH | Method and device for generating a character in a workpiece surface by scratch embossing and for simultaneous monitoring of the scratch embossing depth |
DE102019100964A1 (en) | 2018-01-15 | 2019-07-18 | ATN Hölzel GmbH | A method for generating a character in a workpiece surface by scratch embossing and method for measuring the scratch embossing depth and apparatus for performing the method for generating a character in a workpiece surface by scratch embossing |
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US8442766B2 (en) * | 2008-10-02 | 2013-05-14 | Certusview Technologies, Llc | Marking apparatus having enhanced features for underground facility marking operations, and associated methods and systems |
CN104858295B (en) * | 2014-02-25 | 2017-01-04 | 富鼎电子科技(嘉善)有限公司 | Metal shell decorative pattern processing method and process equipment thereof |
DE102014105688A1 (en) * | 2014-04-23 | 2015-10-29 | Andreas Maier Gmbh & Co. Kg | Identification tool and method for monitoring the function of a marking tool |
CN103949541B (en) * | 2014-05-20 | 2016-01-13 | 郑小玲 | Pendulum plate clashes into punching machine |
DK2954962T3 (en) * | 2014-06-13 | 2017-01-30 | Salvagnini Italia Spa | Punching apparatus |
WO2017142387A1 (en) * | 2016-02-18 | 2017-08-24 | Cmp Pratsa, S.A. De C.V. | Metal bar marked by direct stamping |
DE102017128475B4 (en) | 2017-11-30 | 2019-07-04 | Rattunde Ag | Method for operating a marking head with pressure sensor |
CN109000575B (en) * | 2018-09-11 | 2019-08-27 | 北京航空航天大学 | Hot wire probe and wall surface distance measurement method and device |
CN111377598B (en) * | 2018-12-28 | 2023-08-04 | 扬明光学股份有限公司 | Apparatus and method for manufacturing molded lens |
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- 2008-04-15 DE DE202008017427U patent/DE202008017427U1/en not_active Expired - Lifetime
- 2008-04-15 DE DE102008019342A patent/DE102008019342A1/en not_active Withdrawn
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2009
- 2009-04-01 EP EP09004804.2A patent/EP2110266B1/en not_active Not-in-force
- 2009-04-09 US US12/421,408 patent/US8356500B2/en active Active
- 2009-04-15 CN CNA2009101497928A patent/CN101590773A/en active Pending
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Also Published As
Publication number | Publication date |
---|---|
EP2110266A3 (en) | 2012-09-05 |
DE202008017427U1 (en) | 2009-08-20 |
EP2110266B1 (en) | 2014-06-25 |
DE102008019342A1 (en) | 2009-10-22 |
CN101590773A (en) | 2009-12-02 |
US8356500B2 (en) | 2013-01-22 |
US20090255306A1 (en) | 2009-10-15 |
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