EP2797703B1 - Tool die for a tool unit - Google Patents

Tool die for a tool unit Download PDF

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Publication number
EP2797703B1
EP2797703B1 EP12812606.7A EP12812606A EP2797703B1 EP 2797703 B1 EP2797703 B1 EP 2797703B1 EP 12812606 A EP12812606 A EP 12812606A EP 2797703 B1 EP2797703 B1 EP 2797703B1
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EP
European Patent Office
Prior art keywords
tool
face
cutting edge
die
recess
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.)
Not-in-force
Application number
EP12812606.7A
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German (de)
French (fr)
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EP2797703A1 (en
Inventor
Rainer Hank
Peter Bytow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trumpf Werkzeugmaschinen SE and Co KG
Original Assignee
Trumpf Werkzeugmaschinen SE and Co KG
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Priority to EP12812606.7A priority Critical patent/EP2797703B1/en
Publication of EP2797703A1 publication Critical patent/EP2797703A1/en
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Publication of EP2797703B1 publication Critical patent/EP2797703B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/14—Dies
    • 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
    • B21D28/34—Perforating tools; Die holders

Definitions

  • the invention relates to a tool die for a tool unit for shearing and / or punching workpieces, in particular sheets.
  • Conventional tool units for shearing and / or punching workpieces, in particular sheets, comprise a tool die with a tool opening and a punch with a punch.
  • the punching tool is moved toward the tool die, so that the punching punch engages with the tool opening in order to punch out a waste part or a good part from the workpiece carrier therebetween.
  • This waste part or good part falls through the tool die down through the tool opening.
  • Such conventional horrtrizen adjacent an end face of the tool die at a right angle to the tool opening to form a circumferential cutting edge.
  • a tool die for a tool unit for preventing such burr formation in which a cutting edge of the tool die is surrounded by a circumferential recess, which is formed by a rake face, which is inclined relative to a front side, on which the tool body rests, and drops constantly.
  • a connecting line is provided, which leads directly to the front side, whereby a step-shaped return from the edge of the cutting edge opposite the cutting edge is given to the end face.
  • a tool die which adjacent to the tool opening and opposite to the end face of the tool body proposes an increase, which is increased in the direction of the punching tool relative to the end face.
  • the forming cutting burr is moved into an opening of the workpiece, in that a groove formed opposite the underside of the workpiece toward the workpiece center is formed, from which the cutting burr in turn extends to the underside of the workpiece.
  • Such an embodiment of the Werk Swissmatrize is also from the JP 63101029 A .
  • this tool die has the disadvantage that an increase relative to the end face of the die is provided, which is disadvantageous when moving the workpiece and that burr formation still remains, even if it does not protrude from the bottom of the workpiece.
  • the invention has for its object to provide a tool die for a tool unit, by which a further reduction of the burr formation while maintaining a shift of the burr formation in the workpiece opening is made possible to the burr freedom of a cutting edge.
  • the burr formation is reduced or even avoided.
  • the burr does not protrude downwardly from a bottom surface of the workpiece but is displaced inwardly into the blanking opening in the workpiece.
  • the integration of the rake face in the recess has the advantage that a force profile can be determined by the cutting surface with a rake face at a predetermined angle, which changes when cutting by overbending. As a result, an improved design of the cutting edge on the workpiece can be achieved.
  • the depression is semicircular or elliptical.
  • the recesses can be selected accordingly, wherein the geometry of the recess is significantly adapted to the rake face to form a predetermined rake angle of the cutting edge.
  • An alternative embodiment of the invention has an egg-shaped or teardrop-shaped depression, in which preferably the greatest depth is provided away from the cutting edge.
  • the alternative embodiments also allow for reduced burr formation.
  • a plateau level is provided between the cutting edge and the rake face which merges into the recess.
  • the plateau level preferably lies in the plane of the end face of the workpiece body.
  • the cutting edge lies in the plane of the end face of the tool body.
  • a further preferred embodiment of the invention provides that the cutting edge is formed recessed towards the end face of the tool body to the center of the tool body, whereby also a simplified production and a disability-free workpiece movement are possible.
  • the tool opening preferably has a conical surface section adjoining the cutting edge, forming a clearance angle of the cutting edge.
  • the punching or shearing work can be further refined to reduce or prevent the formation of burrs.
  • an adaptation of the rake angle and the clearance angle to the material thickness and / or the material of the material to be machined of the workpiece, in order to achieve an optimization up to the burr freedom.
  • FIG. 1 perspective view of a tool die 11 according to the invention is shown.
  • This tool die 11 is part of a schematic in FIG. 2 illustrated tool unit 12, which comprises a punching tool 14 with a punch 15 and the tool die 11.
  • the punching tool 14 may include a punch guide 16 for guiding the punch 15.
  • the tool die 11 comprises an end face 21 on which an underside 22 of the workpiece 17 rests during machining.
  • a tool opening 24 is provided, which is surrounded by a cutting edge 33.
  • the workpiece 17 is positioned for machining.
  • the punch 18 engages in the tool opening 24.
  • a waste part 30 or a good part is formed, which is brought out via a lower side on the tool die 11.
  • an enlarged recess 28 may be provided on the underside of the tool die 11, which adjoins the tool opening 24.
  • FIG. 4a shows an enlarged detail D according to FIG. 3
  • the cutting edge 33 is according to this embodiment preferably in the plane of the end face 21 of the tool die 11 and limits the tool opening 24. Between the cutting edge 33 and the end face 21 of the tool die 11, the recess 32 is formed, which remote from the tool opening 24 back into the end face 21 passes.
  • a rake surface 34 is formed, which comprises, for example, a width of the surface according to the illustrated double-headed arrow. This rake face 34 is below a predetermined rake angle 35 arranged to form and determine a cutting geometry of the cutting edge 33.
  • a base surface 37 of the recess 32 Adjacent to the clamping surface 34, a base surface 37 of the recess 32 is provided which, for example, comprises a planar surface section 39 and subsequently opens into the front side 21 by means of a curvature or a curved surface 40.
  • recess 32 is designed drop-shaped, wherein the tip portion of the drop is aligned with the cutting edge 33.
  • the recess 32 may also be formed egg-shaped.
  • the base 37 may also be reduced so that only a lowest point is formed.
  • the cutting edge geometry can be determined by a clearance angle 41.
  • the clearance angle is 0 °. This can also include several degrees.
  • a determination of the rake angle 35 and the clearance angle 41 can take place as a function of the material to be processed, thereby defining the wedge angle of the cutting edge 33.
  • FIG. 4b is an alternative embodiment to FIG. 4a an enlarged detail D according to FIG. 3 shown.
  • This embodiment deviates from that in FIG. 4a illustrated embodiment to the effect that between the cutting edge 33 and the rake face 34, a plateau level 36 is provided.
  • This plateau level 36 is preferably located in the plane of the end face 21 of the tool body 26 and may also be arranged offset in relation to the end face 21 of the tool body 26 in the tool opening 24.
  • depression 32 is, for example, teardrop-shaped or egg-shaped or elliptical.
  • a base 37 may be provided in the deepest region, which comprises a flat surface section or the surface section may also be reduced to a lowest point.
  • the depressions 32 according to the FIGS. 4a and 4b may have a consistently curved surface, so that starting from the rake surface 34 via a deepest Point in the recess up to the extension in the front side 41 a step-free recess 32 is formed.
  • This embodiment of the recess 32 which is free of edges, steps or sudden transitions, allows a special reduction in burr formation and can lead to burr freedom.
  • This embodiment according to the invention of the cutting edge 33 with a recess 32 immediately adjacent thereto with respect to the end face 21 makes it possible for a force profile to be changed during the cutting by an overbending of the cutting edge 33.
  • This cutting edge 42 of the workpiece opening 43 of the workpiece 17 comprises a considerably reduced burr formation, in which a burr 44 is displaced towards a bottom side 45 of the workpiece 17 in the direction of the workpiece center or comprises a ridge reduction 45.
  • the ridge 44 does not protrude from the underside 55 of the workpiece 17.
  • the ridge 44 includes only a minimum ridge width 46 bounded by a plateau portion 47 defined by a trough entrance angle 48.
  • This sectional view according to FIG. 5 shows that adjoining a Kanteneinzugsbreite 49 a smooth cutting height 50 and this in turn is offset back a fracture surface height 52 is given, which ends by the formation of the ridge 44.
  • the ridge tip relative to the bottom 55 as well as against the blade cutting height 50 is displaced in each case inward, so that there is no impairment in the further processing at a minimally remaining ridge 44 is given.
  • the plateau level 36 of the tool die 11 defines a plateau portion 47 of the workpiece 17.
  • the rake angle 35 of the rake surface 34 of the tool die 11 determines the trough entrance angle 48 of the ridge 44 with respect to a portion between the bottom 55 and in the plateau portion 47 of the workpiece 17.
  • the plateau level 36 on the tool body 26 is smaller than the clamping surface 34 adjacent thereto.
  • FIG. 6 is an alternative embodiment of the recess 32 to the embodiment according to the FIGS. 1 to 4 shown.
  • the recess 32 has a semicircular cross-section.
  • a plateau level 36 may be provided between the cutting edge 33 of the rake face 34.
  • the geometry of the recess 32 is determined in a region adjacent to the cutting edge 33 by the width and the angular arrangement of the rake face 34. Subsequent thereto, that is to say in the further course with respect to the base surface 37, the recess 32 can comprise different contours.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Punching Or Piercing (AREA)

Description

Die Erfindung betrifft eine Werkzeugmatrize für eine Werkzeugeinheit zum Scheren und/oder Stanzen von Werkstücken, insbesondere von Blechen.The invention relates to a tool die for a tool unit for shearing and / or punching workpieces, in particular sheets.

Konventionelle Werkzeugeinheiten zum Scheren und/oder Stanzen von Werkstücken, insbesondere von Blechen, umfassen eine Werkzeugmatrize mit einer Werkzeugöffnung sowie ein Stanzwerkzeug mit einem Stanzstempel. Beim Stanzvorgang eines Werkstückes mit einer Werkzeugeinheit wird das Stanzwerkzeug auf die Werkzeugmatrize zubewegt, so dass der Stanzstempel mit der Werkzeugöffnung in Eingriff gelangt, um ein Abfallteil oder Gutteil aus dem dazwischen liegenden Werkstückträger auszustanzen. Dieses Abfallteil oder Gutteil fällt durch die Werkzeugmatrize nach unten durch die Werkzeugöffnung hindurch. Bei solchen konventionellen Werkzeugmätrizen grenzt eine Stirnseite der Werkzeugmatrize in einem rechten Winkel zur Werkzeugöffnung unter Bildung einer umlaufenden Schneidkante an. Bei solchen, Werkzeugeinheiten entsteht während der Stanzbearbeitung von Werkstücken an der Schnittkante eine Gratbildung, bei welcher der Grat gegenüber einer Unterseite des Werkstückes nach unten hervorsteht. Ein solcher hervorstehender Grat führt bei der weiteren Bearbeitung zu Beschädigungen. Deshalb ist eine Nachbearbeitung zum Entfernen des Grates erforderlich.Conventional tool units for shearing and / or punching workpieces, in particular sheets, comprise a tool die with a tool opening and a punch with a punch. During the punching process of a workpiece with a tool unit, the punching tool is moved toward the tool die, so that the punching punch engages with the tool opening in order to punch out a waste part or a good part from the workpiece carrier therebetween. This waste part or good part falls through the tool die down through the tool opening. In such conventional Werkzeugmätrizen adjacent an end face of the tool die at a right angle to the tool opening to form a circumferential cutting edge. In such, tool units formed during the punching of workpieces at the cutting edge burr formation, wherein the ridge protrudes downwards relative to a bottom of the workpiece. Such a projecting burr leads to damage during further processing. Therefore, post-processing to remove the burr is required.

Aus der JP 09-47828 A ist eine Werkzeugmatrize für eine Werkzeugeinheit zur Vermeidung einer solchen Gratbildung bekannt, bei der eine Schneidkante der Werkzeugmatrize von einer umlaufenden Vertiefung umgeben ist, welche durch eine Spanfläche gebildet ist, die gegenüber einer Stirnseite, auf welcher der Werkzeugkörper aufliegt, geneigt ist und konstant abfällt. Am Ende der Spanfläche ist eine Verbindungsgerade vorgesehen, die direkt zur Stirnseite führt, wodurch ein stufenförmiger Rücksprung von dem der Schneidkante gegenüberliegenden Ende der Spanfläche zur Stirnseite gegeben ist. Eine analoge Anordnung geht aus der EP 2 153 915 A1 hervor. Diese beiden Anordnungen ermöglichen zwar eine Verbesserung bezüglich der Gratbildung, jedoch verbleibt noch eine hinreichend große und störende Gratbildung.From the JP 09-47828 A a tool die for a tool unit for preventing such burr formation is known in which a cutting edge of the tool die is surrounded by a circumferential recess, which is formed by a rake face, which is inclined relative to a front side, on which the tool body rests, and drops constantly. At the end of the rake face a connecting line is provided, which leads directly to the front side, whereby a step-shaped return from the edge of the cutting edge opposite the cutting edge is given to the end face. An analog arrangement goes out of the EP 2 153 915 A1 out. These two Although arrangements make it possible to improve the formation of burrs, a sufficiently large and annoying burr formation still remains.

Gemäß der EP 0 734 799 B1 wird eine Werkzeugmatrize vorgeschlagen, welche an die Werkzeugöffnung angrenzend und gegenüber der Stirnseite des Werkzeugkörpers eine Erhöhung vorschlägt, die in Richtung auf das Stanzwerkzeug gegenüber der Stirnseite überhöht ist. Dadurch wird während des Stanzvorganges der sich bildende Schnittgrat in eine Öffnung des Werkstücks hinein verlegt, indem eine gegenüber einer Unterseite des Werkstücks zur Werkstückmitte hin versetzte Hohlkehle ausgebildet ist, von der sich aus der Schnittgrat wiederum zur Unterseite des Werkstücks erstreckt. Eine solche Ausgestaltung der Werkstückmatrize ist auch aus der JP 63101029 A , JP 08-332529 A und JP 03-275224 A bekannt.According to the EP 0 734 799 B1 a tool die is proposed, which adjacent to the tool opening and opposite to the end face of the tool body proposes an increase, which is increased in the direction of the punching tool relative to the end face. As a result, during the punching process, the forming cutting burr is moved into an opening of the workpiece, in that a groove formed opposite the underside of the workpiece toward the workpiece center is formed, from which the cutting burr in turn extends to the underside of the workpiece. Such an embodiment of the Werkstückmatrize is also from the JP 63101029 A . JP 08-332529 A and JP 03-275224 A known.

Durch eine solche Ausführungsform wird zwar ermöglicht, dass eine Gratbildung kein Hindernis für die nachfolgende Bearbeitung darstellt und nicht entfernt ist, jedoch weist diese Werkzeugmatrize den Nachteil auf, dass eine Erhöhung gegenüber der Stirnseite der Matrize vorgesehen ist, welche beim Bewegen des Werkstückes nachteilig ist und dass dennoch eine Gratbildung verbleibt, selbst wenn diese nicht gegenüber der Unterseite des Werkstücks hervorsteht.Although such an embodiment makes it possible that burring is not an obstacle to subsequent processing and is not removed, however, this tool die has the disadvantage that an increase relative to the end face of the die is provided, which is disadvantageous when moving the workpiece and that burr formation still remains, even if it does not protrude from the bottom of the workpiece.

Der Erfindung liegt die Aufgabe zugrunde, eine Werkzeugmatrize für eine Werkzeugeinheit zu schaffen, durch welche eine weitere Reduzierung der Gratbildung unter Beibehaltung einer Verlagerung der Gratbildung in die Werkstücköffnung bis hin zur Gratfreiheit einer Schnittkante ermöglicht wird.The invention has for its object to provide a tool die for a tool unit, by which a further reduction of the burr formation while maintaining a shift of the burr formation in the workpiece opening is made possible to the burr freedom of a cutting edge.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Weitere vorteilhafte Ausgestaltungen und Weiterbildungen sind in den weiteren Ansprüchen angegeben.This object is achieved by the features of claim 1. Further advantageous embodiments and further developments are specified in the further claims.

Durch die Ausgestaltung einer Schneidkante an der Werkzeugmatrize mit einer daran angrenzenden umlaufenden Vertiefung, bei der die Schneidkante durch eine Spanfläche gebildet ist, die gegenüber der Stirnseite des Werkzeugkörpers geneigt ist und fließend in eine Grundfläche oder einen tiefsten Punkt der Vertiefung übergeht, wobei von dort aus sich eine gekrümmte Fläche bis zur Stirnseite des Werkzeugkörpers erstreckt, wird die Gratbildung reduziert oder sogar vermieden. Darüber hinaus kann im Falle einer reduzierten Gratbildung erzielt werden, dass der Grat nicht gegenüber einer Unterseite des Werkstücks nach unten hervorragt, sondern nach innen in die Stanzöffnung im Werkstück verlagert ist. Des Weiteren weist die Einbindung der Spanfläche in die Vertiefung den Vorteil auf, dass durch die Schneidfläche mit einer Spanfläche in einem vorbestimmten Winkel ein Kraftverlauf bestimmt werden kann, welcher sich beim Schneiden durch Überbiegen verändert. Dadurch kann eine verbesserte Ausbildung der Schnittkante am Werkstück erzielt werden.By the configuration of a cutting edge on the tool die with an adjacent circumferential recess, wherein the cutting edge is formed by a rake face, which is opposite to the Front side of the tool body is inclined and merges smoothly into a base or a deepest point of the depression, wherein there extends from a curved surface to the front side of the tool body, the burr formation is reduced or even avoided. Moreover, in the case of reduced burr formation, it may be achieved that the burr does not protrude downwardly from a bottom surface of the workpiece but is displaced inwardly into the blanking opening in the workpiece. Furthermore, the integration of the rake face in the recess has the advantage that a force profile can be determined by the cutting surface with a rake face at a predetermined angle, which changes when cutting by overbending. As a result, an improved design of the cutting edge on the workpiece can be achieved.

Gemäß einer ersten bevorzugten Ausgestaltung der Erfindung ist die Vertiefung halbkreisförmig oder elliptisch ausgebildet. In Abhängigkeit der zu optimierenden Parameter für den Stanzprozess können die Vertiefungen entsprechend gewählt werden, wobei die Geometrie der Vertiefung maßgeblich an die Spanfläche zur Bildung eines vorbestimmten Spanwinkels der Schneidkante angepasst wird.According to a first preferred embodiment of the invention, the depression is semicircular or elliptical. Depending on the parameters to be optimized for the punching process, the recesses can be selected accordingly, wherein the geometry of the recess is significantly adapted to the rake face to form a predetermined rake angle of the cutting edge.

Eine alternative Ausgestaltung der Erfindung weist eine eiförmige oder tropfenförmige Vertiefung auf, bei welcher bevorzugt die größte Tiefe entfernt von der Schneidkante vorgesehen ist. Die alternativen Ausführungsformen ermöglichen ebenfalls eine reduzierte Gratbildung.An alternative embodiment of the invention has an egg-shaped or teardrop-shaped depression, in which preferably the greatest depth is provided away from the cutting edge. The alternative embodiments also allow for reduced burr formation.

Bevorzugt ist zwischen der Schneidkante und der Spanfläche, die in die Vertiefung übergeht, eine Plateauebene vorgesehen. Dadurch kann eine definierte Verlagerung des Schnittgrades entgegen der Schnittrichtung in die Werkstücköffnung erzielt werden.Preferably, a plateau level is provided between the cutting edge and the rake face which merges into the recess. As a result, a defined displacement of the cutting degree counter to the cutting direction into the workpiece opening can be achieved.

Des Weiteren liegt die Plateauebene bevorzugt in der Ebene der Stirnseite des Werkstückkörpers. Dadurch können Überhöhungen gegenüber der Stirnseite des Werkzeugkörpers der Werkzeugmatrize vermieden werden und eine den Werkstücktransport behindernde Störkante entfallen.Furthermore, the plateau level preferably lies in the plane of the end face of the workpiece body. As a result, elevations with respect to the end face of the tool body of the tool die can be avoided, and a disturbing edge impeding the workpiece transport can be dispensed with.

Nach einer weiteren bevorzugten Ausgestaltung der Erfindung liegt die Schneidkante in der Ebene der Stirnseite des Werkzeugkörpers. Durch diese Anordnung werden Überhöhungen gegenüber der Stirnseite des Werkzeugkörpers der Werkzeugmatrize vermieden. Dadurch kann eine dem Werkstücktransport behindernde Störkante entfallen.According to a further preferred embodiment of the invention, the cutting edge lies in the plane of the end face of the tool body. By this arrangement, elevations are avoided with respect to the end face of the tool body of the tool die. This can be a the workpiece transport obstructing Störkante omitted.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, dass die Schneidkante gegenüber der Stirnseite des Werkzeugkörpers zur Werkzeugkörpermitte hin vertieft ausgebildet ist, wodurch ebenfalls eine vereinfachte Herstellung und eine behinderungsfreie Werkstückbewegung ermöglicht sind.A further preferred embodiment of the invention provides that the cutting edge is formed recessed towards the end face of the tool body to the center of the tool body, whereby also a simplified production and a disability-free workpiece movement are possible.

Die Werkzeugöffnung weist bevorzugt einen an die Schneidkante angrenzenden konischen Flächenabschnitt unter Bildung eines Freiwinkels der Schneidkante auf. Dadurch kann die Stanz- oder Scherbearbeitung weiter verfeinert werden, um die Gratbildung zu reduzieren oder zu verhindern. Bevorzugt erfolgt eine Anpassung des Spanwinkels und des Freiwinkels an die Materialstärke und/oder des Werkstoffs des zu bearbeitenden Materials des Werkstücks, um eine Optimierung bis hin zur Gratfreiheit zu erzielen.The tool opening preferably has a conical surface section adjoining the cutting edge, forming a clearance angle of the cutting edge. As a result, the punching or shearing work can be further refined to reduce or prevent the formation of burrs. Preferably, an adaptation of the rake angle and the clearance angle to the material thickness and / or the material of the material to be machined of the workpiece, in order to achieve an optimization up to the burr freedom.

Die Erfindung sowie weitere vorteilhafte Ausführungsformen und Weiterbildungen derselben werden im Folgenden anhand der in den Zeichnungen dargestellten Beispiele näher beschrieben und erläutert. Die der Beschreibung und den Zeichnungen zu entnehmenden Merkmale können einzeln für sich oder zu mehreren in beliebiger Kombination erfindungsgemäß angewandt werden. Es zeigen:

  • Figur 1 eine perspektivische Darstellung einer erfindungsgemäßen Werkzeugmatrize für eine Werkzeugeinheit,
  • Figur 2 eine schematische Ansicht eines Stanzvorganges mit der erfindungsgemäßen Werkzeugmatrize gemäß Figur 1,
  • Figur 3 eine schematische Schnittdarstellung der Werkzeugmatrize entlang der Linie A-A in Figur 1,
  • Figur 4a eine schematisch vergrößerte Detailansicht D gemäß Figur 3,
  • Figur 4b eine schematisch vergrößerte Detailansicht D einer alternativen Ausführungsform gemäß Figur 3,
  • Figur 5 eine schematisch vergrößerte Ansicht eines Schnittbereiches eines mit der Werkzeugmatrize gemäß Figur 1 hergestellten Werkstücks und
  • Figur 6 eine schematische Schnittdarstellung einer alternativen Ausführungsform der Werkstückmatrize gemäß den Figuren 1 bis 4.
The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:
  • FIG. 1 a perspective view of a tool die according to the invention for a tool unit,
  • FIG. 2 a schematic view of a punching operation with the tool according to the invention mold according to FIG. 1 .
  • FIG. 3 a schematic sectional view of the Werkzeugmatrize along the line AA in FIG. 1 .
  • FIG. 4a a schematically enlarged detail view D according to FIG. 3 .
  • FIG. 4b a schematically enlarged detail view D of an alternative embodiment according to FIG. 3 .
  • FIG. 5 a schematically enlarged view of a cutting area of one with the Werkzeugmatrize according to FIG. 1 manufactured workpiece and
  • FIG. 6 a schematic sectional view of an alternative Embodiment of the workpiece die according to FIGS. 1 to 4 ,

In Figur 1 ist perspektivisch eine erfindungsgemäße Werkzeugmatrize 11 dargestellt. Diese Werkzeugmatrize 11 ist Bestandteil einer schematisch in Figur 2 dargestellten Werkzeugeinheit 12, welche ein Stanzwerkzeug 14 mit einem Stanzstempel 15 sowie die Werkzeugmatrize 11 umfasst. Das Stanzwerkzeug 14 kann eine Stanzführung 16 zur Führung des Stanzstempels 15 umfassen.In FIG. 1 perspective view of a tool die 11 according to the invention is shown. This tool die 11 is part of a schematic in FIG. 2 illustrated tool unit 12, which comprises a punching tool 14 with a punch 15 and the tool die 11. The punching tool 14 may include a punch guide 16 for guiding the punch 15.

Die Werkzeugmatrize 11 umfasst eine Stirnseite 21, auf welcher eine Unterseite 22 des Werkstücks 17 während der Bearbeitung aufliegt. In dieser Stirnseite 21 der Werkzeugmatrize 11 ist eine Werkzeugöffnung 24 vorgesehen, welche von einer Schneidkante 33 umgeben ist. Zwischen der Werkzeugmatrize 11 und dem Stanzwerkzeug 14 wird das Werkstück 17 zur Bearbeitung positioniert. Zur Herstellung einer Werkstücköffnung 43 im Werkstück 17 greift der Stanzstempel 18 in die Werkzeugöffnung 24 ein. Dadurch wird ein Abfallteil 30 oder ein Gutteil gebildet, welches über eine Unterseite auf der Werkzeugmatrize 11 herausgeführt wird. Um einen Transport des Abfallteils 30 oder Gutteils zu erleichtern, kann an der Unterseite der Werkzeugmatrize 11 eine vergrößerte Ausnehmung 28 vorgesehen sein, welche an die Werkzeugöffnung 24 angrenzt.The tool die 11 comprises an end face 21 on which an underside 22 of the workpiece 17 rests during machining. In this end face 21 of the tool die 11, a tool opening 24 is provided, which is surrounded by a cutting edge 33. Between the tool die 11 and the punching tool 14, the workpiece 17 is positioned for machining. To produce a workpiece opening 43 in the workpiece 17, the punch 18 engages in the tool opening 24. As a result, a waste part 30 or a good part is formed, which is brought out via a lower side on the tool die 11. In order to facilitate a transport of the waste part 30 or good part, an enlarged recess 28 may be provided on the underside of the tool die 11, which adjoins the tool opening 24.

Zur weiteren Erörterung der erfindungsgemäßen Ausgestaltung einer Schneidkante 33, welche an eine Vertiefung 32 angrenzt, die die Werkzeugöffnung 24 umgibt, wird auf die nachfolgenden Figuren 3 und 4 näher Bezug genommen.To further discuss the inventive design of a cutting edge 33 which abuts a recess 32 which surrounds the tool opening 24, reference is made to the following Figures 3 and 4 further referred to.

Figur 4a zeigt ein vergrößertes Detail D gemäß Figur 3. Die Schneidkante 33 liegt gemäß dieser Ausführungsform bevorzugt in der Ebene der Stirnseite 21 der Werkzeugmatrize 11 und begrenzt die Werkzeugöffnung 24. Zwischen der Schneidkante 33 und der Stirnseite 21 der Werkzeugmatrize 11 ist die Vertiefung 32 ausgebildet, welche entfernt von der Werkzeugöffnung 24 wieder in die Stirnseite 21 übergeht. Unmittelbar an die Schneidkante 33 angrenzend und in die Vertiefung 32 sich erstreckend ist eine Spanfläche 34 ausgebildet, welche beispielsweise eine Breite der Fläche gemäß dem dargestellten Doppelpfeil umfasst. Diese Spanfläche 34 ist unter einem vorbestimmten Spanwinkel 35 angeordnet, um eine Schneidengeometrie der Schneidkante 33 zu bilden und zu bestimmen. An die Spanfläche 34 angrenzend ist eine Grundfläche 37 der Vertiefung 32 vorgesehen, welche beispielsweise einen ebenen Flächenabschnitt 39 umfasst und anschließend mittels einer Krümmung oder einer gekrümmten Fläche 40 in die Stirnseite 21 mündet. Die in Figur 4a dargestellte Vertiefung 32 ist tropfenförmig ausgestaltet, wobei der spitze Bereich des Tropfens zur Schneidkante 33 ausgerichtet ist. Alternativ kann die Vertiefung 32 auch eiförmig ausgebildet sein. Die Grundfläche 37 kann auch derart reduziert sein, dass nur ein tiefster Punkt ausgebildet ist. FIG. 4a shows an enlarged detail D according to FIG. 3 , The cutting edge 33 is according to this embodiment preferably in the plane of the end face 21 of the tool die 11 and limits the tool opening 24. Between the cutting edge 33 and the end face 21 of the tool die 11, the recess 32 is formed, which remote from the tool opening 24 back into the end face 21 passes. Immediately adjacent to the cutting edge 33 and extending into the recess 32, a rake surface 34 is formed, which comprises, for example, a width of the surface according to the illustrated double-headed arrow. This rake face 34 is below a predetermined rake angle 35 arranged to form and determine a cutting geometry of the cutting edge 33. Adjacent to the clamping surface 34, a base surface 37 of the recess 32 is provided which, for example, comprises a planar surface section 39 and subsequently opens into the front side 21 by means of a curvature or a curved surface 40. In the FIG. 4a shown recess 32 is designed drop-shaped, wherein the tip portion of the drop is aligned with the cutting edge 33. Alternatively, the recess 32 may also be formed egg-shaped. The base 37 may also be reduced so that only a lowest point is formed.

Ergänzend zur Spanfläche 34, welche durch den Spanwinkel 35 bestimmt ist, kann die Schneidkantengeometrie durch einen Freiwinkel 41 bestimmt sein. Im Ausführungsbeispiel gemäß Figur 4a ist der Freiwinkel gleich 0°. Dieser kann auch mehrere Winkelgrade umfassen. Zur Optimierung der Schneidkante 33 bis hin zur Gratfreiheit kann eine in Abhängigkeit des zu bearbeitenden Materials erfolgende Bestimmung des Spanwinkels 35 und des Freiwinkels 41 erfolgen, um dadurch den Keilwinkel der Schneidkante 33 zu definieren.In addition to the rake surface 34, which is determined by the rake angle 35, the cutting edge geometry can be determined by a clearance angle 41. In the embodiment according to FIG. 4a the clearance angle is 0 °. This can also include several degrees. In order to optimize the cutting edge 33 up to the burr freedom, a determination of the rake angle 35 and the clearance angle 41 can take place as a function of the material to be processed, thereby defining the wedge angle of the cutting edge 33.

In Figur 4b ist eine alternative Ausführungsform zu Figur 4a eines vergrößerten Details D gemäß Figur 3 dargestellt. Diese Ausführungsform weicht von der in Figur 4a dargestellten Ausführungsform dahingehend ab, dass zwischen der Schneidkante 33 und der Spanfläche 34 eine Plateauebene 36 vorgesehen ist. Diese Plateauebene 36 liegt bevorzugt in der Ebene der Stirnseite 21 des Werkzeugkörpers 26 und kann auch gegenüber der Stirnseite 21 des Werkzeugkörpers 26 in die Werkzeugöffnung 24 hineinversetzt angeordnet sein. Die in Figur 4b dargestellte Vertiefung 32 ist beispielsweise tropfenförmig oder eiförmig oder auch elliptisch ausgebildet. Dabei kann in der Vertiefung 32 wiederum im tiefsten Bereich eine Grundfläche 37 vorgesehen sein, die einen ebenen Flächenabschnitt umfasst oder der Flächenabschnitt kann auch auf einen tiefsten Punkt reduziert sein. Die Vertiefungen 32 gemäß den Figuren 4a und 4b können eine durchweg gekrümmte Fläche aufweisen, so dass ausgehend von der Spanfläche 34 über einen tiefsten Punkt in der Vertiefung bis hin zur Erstreckung in die Stirnseite 41 eine stufenfreie Vertiefung 32 gebildet ist. Diese Ausgestaltung der Vertiefung 32, die frei von Kanten, Stufen oder sprunghaften Übergängen ist, ermöglicht eine besondere Reduzierung bei der Gratbildung und kann bis hin zur Gratfreiheit führen.In FIG. 4b is an alternative embodiment to FIG. 4a an enlarged detail D according to FIG. 3 shown. This embodiment deviates from that in FIG. 4a illustrated embodiment to the effect that between the cutting edge 33 and the rake face 34, a plateau level 36 is provided. This plateau level 36 is preferably located in the plane of the end face 21 of the tool body 26 and may also be arranged offset in relation to the end face 21 of the tool body 26 in the tool opening 24. In the FIG. 4b shown depression 32 is, for example, teardrop-shaped or egg-shaped or elliptical. In this case, in the depression 32, in turn, a base 37 may be provided in the deepest region, which comprises a flat surface section or the surface section may also be reduced to a lowest point. The depressions 32 according to the FIGS. 4a and 4b may have a consistently curved surface, so that starting from the rake surface 34 via a deepest Point in the recess up to the extension in the front side 41 a step-free recess 32 is formed. This embodiment of the recess 32, which is free of edges, steps or sudden transitions, allows a special reduction in burr formation and can lead to burr freedom.

Diese erfindungsgemäße Ausgestaltung der Schneidkante 33 mit einer unmittelbar daran angrenzenden Vertiefung 32 gegenüber der Stirnseite 21 ermöglicht, dass während dem Schneiden ein Kraftverlauf durch eine Überbiegung der Schneidkante 33 verändert wird. Insbesondere durch die Ausführungsform gemäß Figur 4b durch kann eine Schnittkante 42 in einer Werkstücköffnung 43 gemäß Figur 5 erzielt werden. Diese Schnittkante 42 der Werkstücköffnung 43 des Werkstücks 17 umfasst eine erheblich reduzierte Gratbildung, bei welcher ein Grat 44 gegenüber einer Unterseite 45 des Werkstücks 17 in Richtung Werkstückmitte verlagert wird beziehungsweise eine Gratabsenkung 45 umfasst. Somit steht der Grat 44 nicht gegenüber der Unterseite 55 des Werkstücks 17 hervor. Darüber hinaus umfasst der Grat 44 nur eine minimale Gratbreite 46, welche durch einen Plateauabschnitt 47 begrenzt wird, die durch einen Muldeneingangswinkel 48 bestimmt ist. Diese Schnittansicht gemäß Figur 5 zeigt des Weiteren, dass sich an eine Kanteneinzugsbreite 49 eine Glattschnitthöhe 50 anschließt und dieser gegenüber wiederum zurück versetzt eine Bruchflächenhöhe 52 gegeben ist, welche durch die Ausbildung des Grates 44 endet. Somit ist die Gratspitze gegenüber der Unterseite 55 als auch gegenüber der Blattschnitthöhe 50 jeweils nach innen verlagert, so dass keine Beeinträchtigung bei der weiteren Bearbeitung bei einem minimal verbleibenden Grat 44 gegeben ist.This embodiment according to the invention of the cutting edge 33 with a recess 32 immediately adjacent thereto with respect to the end face 21 makes it possible for a force profile to be changed during the cutting by an overbending of the cutting edge 33. In particular, by the embodiment according to FIG. 4b through a cutting edge 42 in a workpiece opening 43 according to FIG. 5 be achieved. This cutting edge 42 of the workpiece opening 43 of the workpiece 17 comprises a considerably reduced burr formation, in which a burr 44 is displaced towards a bottom side 45 of the workpiece 17 in the direction of the workpiece center or comprises a ridge reduction 45. Thus, the ridge 44 does not protrude from the underside 55 of the workpiece 17. In addition, the ridge 44 includes only a minimum ridge width 46 bounded by a plateau portion 47 defined by a trough entrance angle 48. This sectional view according to FIG. 5 shows that adjoining a Kanteneinzugsbreite 49 a smooth cutting height 50 and this in turn is offset back a fracture surface height 52 is given, which ends by the formation of the ridge 44. Thus, the ridge tip relative to the bottom 55 as well as against the blade cutting height 50 is displaced in each case inward, so that there is no impairment in the further processing at a minimally remaining ridge 44 is given.

Bei der Zusammenschau der Schneidkante 33 der Werkzeugmatrize 11 gemäß Figur 4b und der Schnittkante 42 des Werkstücks 17 wird ersichtlich, dass die Plateauebene 36 der Werkzeugmatrize 11 einen Plateauabschnitt 47 des Werkstücks 17 bestimmt. Der Spanwinkel 35 der Spanfläche 34 der Werkzeugmatrize 11 bestimmt den Muldeneingangswinkel 48 des Grates 44 bezüglich eines Abschnittes zwischen der Unterseite 55 und im Plateauabschnitt 47 des Werkstücks 17. Bevorzugt ist die Plateauebene 36 am Werkzeugkörper 26 kleiner als die daran angrenzende Spanfläche 34 ausgebildet.When looking through the cutting edge 33 of the tool die 11 according to FIG. 4b and the cutting edge 42 of the workpiece 17, it can be seen that the plateau level 36 of the tool die 11 defines a plateau portion 47 of the workpiece 17. The rake angle 35 of the rake surface 34 of the tool die 11 determines the trough entrance angle 48 of the ridge 44 with respect to a portion between the bottom 55 and in the plateau portion 47 of the workpiece 17. Preferably, the plateau level 36 on the tool body 26 is smaller than the clamping surface 34 adjacent thereto.

In Figur 6 ist eine alternative Ausführungsform der Vertiefung 32 zum Ausführungsbeispiel gemäß den Figuren 1 bis 4 dargestellt. Bei dieser Ausführungsform weist die Vertiefung 32 einen halbkreisförmigen Querschnitt auf.In FIG. 6 is an alternative embodiment of the recess 32 to the embodiment according to the FIGS. 1 to 4 shown. In this embodiment, the recess 32 has a semicircular cross-section.

Bei dieser alternativen Ausführungsform kann ebenso eine Plateauebene 36 zwischen der Schneidkante 33 der Spanfläche 34 vorgesehen sein.In this alternative embodiment as well, a plateau level 36 may be provided between the cutting edge 33 of the rake face 34.

Die Geometrie der Vertiefung 32 ist in einem an die Schneidkante 33 angrenzenden Bereich durch die Breite und die Winkelanordnung der Spanfläche 34 bestimmt. Im Anschluss daran, das heißt im weiteren Verlauf bezüglich der Grundfläche 37, kann die Vertiefung 32 verschiedene Konturen umfassen.The geometry of the recess 32 is determined in a region adjacent to the cutting edge 33 by the width and the angular arrangement of the rake face 34. Subsequent thereto, that is to say in the further course with respect to the base surface 37, the recess 32 can comprise different contours.

Claims (8)

  1. A tool die for a tool unit (12) for punching and/or shearing workpieces (17), in particular metal sheets, having a tool body (26) that comprises a tool aperture (24) traversing the tool body (26) and designed for engagement with a punch (15) of a punching tool (14), and having an end face (21) provided on the tool body (26) for supporting a workpiece (17) thereon, and having a cutting edge (33) that surrounds the tool aperture (24), said cutting edge (33) being surrounded by a circumferential recess (32) that transitions into the end face (21) and the cutting edge (33) being formed by a rake face (34) that is inclined with respect to the end face (21) at a given rake angle (35), characterised in that the rake face (34) smoothly transitions into a base surface (37) or a lowest point of the recess (32) and in that the recess (32) has a curved surface (40) extending therefrom towards said end face.
  2. The tool die as claimed in claim 1, characterised in that the recess (32) has a semi-circular or an elliptical cross-section.
  3. The tool die as claimed in claim 1, characterised in that the recess (32) comprises an egg-shaped or drop-shaped recess in which the greatest depth is preferably located distant from the cutting edge (33).
  4. The tool die as claimed in claim 1, characterised in that a plateau plane (36) is provided between the cutting edge (33) and the rake surface (34).
  5. The tool die as claimed in claim 4, characterised in that the plateau plane (36) lies in the plane of the end face (21) of the tool body (26) or is retreated from the end face (21) of the tool body (26) in a direction toward the centre of the tool body (26).
  6. The tool die as claimed in claim 1, characterised in that the cutting edge (33) lies in the plane of the end face (21) of the tool body (26).
  7. The tool die as claimed in any one of claims 1 to 5, characterised in that the cutting edge (33) is recessed from the plane of the end face (21) of the tool body (26) towards the centre of the tool body (26).
  8. The tool die as claimed in any of the preceding claims, characterised in that the tool aperture (24) has a conical surface portion situated adjacent to the cutting edge (33) and forming a relief angle (41).
EP12812606.7A 2011-12-28 2012-12-19 Tool die for a tool unit Not-in-force EP2797703B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12812606.7A EP2797703B1 (en) 2011-12-28 2012-12-19 Tool die for a tool unit

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11195900.3A EP2610019A1 (en) 2011-12-28 2011-12-28 Tool die for a tool unit
PCT/EP2012/076157 WO2013098154A1 (en) 2011-12-28 2012-12-19 Tool die for a tool unit
EP12812606.7A EP2797703B1 (en) 2011-12-28 2012-12-19 Tool die for a tool unit

Publications (2)

Publication Number Publication Date
EP2797703A1 EP2797703A1 (en) 2014-11-05
EP2797703B1 true EP2797703B1 (en) 2016-07-06

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EP11195900.3A Withdrawn EP2610019A1 (en) 2011-12-28 2011-12-28 Tool die for a tool unit
EP12812606.7A Not-in-force EP2797703B1 (en) 2011-12-28 2012-12-19 Tool die for a tool unit

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WO (1) WO2013098154A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI583456B (en) * 2013-11-05 2017-05-21 王正平 Trough-form fine blanking device
JP6418249B2 (en) 2014-12-10 2018-11-07 新日鐵住金株式会社 Blank, molded product manufacturing method, mold and blank manufacturing method
CN107413952A (en) * 2017-07-05 2017-12-01 芜湖市成冉精密模具有限公司 A kind of blanking edge rolling integrative-structure

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212886A (en) * 1938-07-01 1940-08-27 Fred F Ruland Cutting tool
JPS63101029A (en) 1986-10-17 1988-05-06 Takiron Co Ltd Manufacture of punching plate
JPH03275224A (en) * 1990-03-23 1991-12-05 Hitachi Cable Ltd Method for blanking lead frame by progressive dies
JPH0569055A (en) * 1991-09-09 1993-03-23 Nissan Motor Co Ltd Cutting device for reducing burrs of tabular work
JPH08267158A (en) 1995-03-28 1996-10-15 Amada Metrecs Co Ltd Die
JPH08332529A (en) * 1995-06-09 1996-12-17 Mitsubishi Motors Corp Die for working pierce hole and method thereof
JP2909714B2 (en) * 1995-08-04 1999-06-23 純宏 後藤 Dies for drilling
JP4287562B2 (en) * 1999-12-27 2009-07-01 日立機材株式会社 Floor panel and manufacturing method thereof
JP5141093B2 (en) * 2007-05-22 2013-02-13 株式会社ワンズ Thin metal drilling die and thin metal drilling device equipped with this die
JP2009202272A (en) * 2008-02-27 2009-09-10 Toyota Motor Corp Die, tool set and pressing method

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WO2013098154A1 (en) 2013-07-04
EP2610019A1 (en) 2013-07-03
EP2797703A1 (en) 2014-11-05

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