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EP0504995B1 - Pinch-pointing jaws - Google Patents

Pinch-pointing jaws Download PDF

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Publication number
EP0504995B1
EP0504995B1 EP92200724A EP92200724A EP0504995B1 EP 0504995 B1 EP0504995 B1 EP 0504995B1 EP 92200724 A EP92200724 A EP 92200724A EP 92200724 A EP92200724 A EP 92200724A EP 0504995 B1 EP0504995 B1 EP 0504995B1
Authority
EP
European Patent Office
Prior art keywords
insert
pinch
base body
pointing
jaws
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.)
Expired - Lifetime
Application number
EP92200724A
Other languages
German (de)
French (fr)
Other versions
EP0504995A1 (en
Inventor
Reinhard Posch
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.)
Plansee Tizit AG
Original Assignee
Plansee Tizit AG
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Filing date
Publication date
Application filed by Plansee Tizit AG filed Critical Plansee Tizit AG
Publication of EP0504995A1 publication Critical patent/EP0504995A1/en
Application granted granted Critical
Publication of EP0504995B1 publication Critical patent/EP0504995B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G3/00—Making pins, nails, or the like
    • B21G3/16—Pointing; with or without cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B21J13/03—Die mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements

Definitions

  • the invention relates to a lasting jaw for machines for nail production, consisting of an elongated, prism-shaped base body with a trapezoidal cross section, one end of which has an exchangeable prismatic insert made of wear-resistant material, which is provided on at least one side surface with a lasting profile for shaping and separating the nail end.
  • Such jaws are used in pairs in machines in which wire is formed into nails. They are arranged there so that the lasting profiles of the lasting jaws lie opposite one another. In the course of the workflow, the lasting jaws are brought together and opened. When the jaws are brought together, the tip of the nail is first molded on and then the nail is pinched off to the desired nail length. The specially designed pinch profile of the pinch jaws results in a reshaping and a cutting operation.
  • the pinch jaws were previously largely made of steel. However, due to the limited wear resistance of steel, they only have a limited service life. If the wear of the lasting profile is inadmissibly high, the lasting jaws must be replaced.
  • DE-OS 28 20 259 describes a machine for nail production, in which the lasting jaws have an insert made of wear-resistant material at one end.
  • the insert is provided on the front with a lasting profile for forming and separating the nail and clamped in a recess in the lasting jaw with a screw and a wedge-shaped clamping piece.
  • a nail beating jaw for shaping the nail head is known.
  • One end of the base body is slotted and provided with a recess which serves to receive an essentially cylindrical insert made of wear-resistant material with a plurality of clamping grooves in the lateral surface.
  • the insert is clamped in the base body by means of a tensioning screw passing through the slot.
  • the invention has for its object to provide a lasting jaw for machines for nail production with an interchangeable insert made of wear-resistant material, which allows a simpler and more space-saving clamping of the insert on the base body compared to known designs and also a clamping of inserts with a lasting profile on all side surfaces allowed.
  • the insert is arranged in an end-side recess of the base body, with lateral and / or rear contact surfaces and with a support surface inclined at an angle between 10 ° and 30 ° to the base surface of the base body, and via a bore penetrating the insert can be screwed to the base body.
  • the insert made of wear-resistant material can be specifically dimensioned small and can be provided with one or more lasting profiles that can be used one after the other.
  • the price / performance ratio compared to pinch jaws with a soldered hard metal end is much cheaper.
  • the special mounting and attachment of the insert ensures that the production is only briefly interrupted when replacing or moving the insert and that no new readjustment or adjustment work is required.
  • the changeover to other nail profiles is only possible in large areas by changing the insert, without having to replace the base body of the lasting jaws.
  • the basic bodies themselves are practically not subject to wear and can therefore be used over a very long period. Even if the insert is destroyed prematurely due to poor adjustment or improper operation, the base body is generally not damaged.
  • the insert made of wear-resistant material is well supported by the base body, so that the forces occurring when the nail tip is formed and when the nail is pinched off are fully absorbed by the base body without the fastening screw being loaded.
  • the screw can therefore be dimensioned small and is only used for positioning and holding the insert in the recess.
  • An inclination of the support surface for use in relation to the base surface of the base body in the range of approximately 20 ° has proven particularly advantageous for the lasting jaws according to the invention.
  • the insert is screwed to the base body by means of a countersunk screw, the axis of the threaded bore in the base body and the axis of the counterbore in use being offset from one another by a distance in the longitudinal direction of the base body, so that use in Tightening the screw against the support surface and at the same time against the rear (s) contact surface (s) of the recess of the base body is pressed.
  • the insert is only provided with a lasting profile, it has proven useful to design the insert with a cuboid basic shape and to provide the rear surface opposite the end profile incorporated in the front with strongly rounded side edges. This ensures a particularly advantageous production of the insert without the safe contact and support of the insert being adversely affected in the recess in the base body.
  • the insert can be implemented multiple times, a truncated-tetrahedral or truncated-pyramid shape with gusset profiles incorporated into the side surfaces has proven particularly useful. This means that the assignment can be implemented twice or three times after the first use.
  • Hard metal is particularly suitable as a material for use from wear-resistant material, but the use of other wear-resistant materials cannot be ruled out.
  • Figures 1-3 show a lasting jaw according to the invention, made of an elongated, prism-shaped base body -1- made of steel.
  • the side surfaces of the base body -1- are inclined 10 ° or 15 ° to each other, depending on the machine type in which the jaws are used, so that the base body -1-has a trapezoidal cross section.
  • the base body -1- has an oblique flattening with a recess -6- for receiving a cuboid insert -3- made of hard metal, which can be screwed to the base body -1-.
  • the recess -6- has two lateral contact surfaces which run parallel in the longitudinal direction of the base body -1- and which are connected to one another by a rear contact surface.
  • the base-side support surface is inclined at an angle ⁇ of 20 ° to the base of the base body -1-, which ensures good support of the insert -3-by the base body -1-.
  • the recess -6- is somewhat shorter than the length of the insert -3-, so that it protrudes slightly on the end face of the base body -1-.
  • a threaded hole -7- is made in the base body -1- perpendicular to the support surface for screwing the hard metal insert -3-.
  • the lasting profile -4- is introduced on the end face of the hard metal insert -3-.
  • the special design of the lasting profile -4- allows the nail tip to be formed in one operation when the lasting jaws are brought together and at the same time the pinched material and the nail end are pinched off the wire.
  • the hard metal insert -3- is provided with a countersunk hole -5- for connection to the base body -1- by means of a fastening screw -2-.
  • the back surface opposite the lasting profile -4- has strongly rounded side edges.
  • the axis of the threaded bore -7- in the base body -1- and the axis of the countersunk bore -5- in the hard metal insert -3- are offset in the longitudinal direction of the base body -1- by a distance -d- so that when the fastening screw is tightened -2- there is a surface pressure between the bottom surface of the hard metal insert -3- and the contact surface in the recess -6- and at the same time the insert -3- is pressed against the rear contact surface of the recess -6-.
  • Figure 4 shows the variant of a hard metal insert -3- which can be used several times.
  • the insert -3- has the basic shape of a tetrahedral stump.
  • a lasting profile -4- is introduced into each of the three lateral surfaces.
  • the insert -3- can be used three times.
  • Due to the tetrahedron-shaped basic shape of the insert -3-, the correspondingly adapted recess -6- in the base body -1- of the jaws suitable for such an insert -3- has two rear contact surfaces running at an angle of 60 °.
  • the working pressure acting on these contact surfaces counteracts the notch effect occurring in the pinch profile -4- of the insert, as a result of which this type of insert -3- can also withstand higher loads.
  • FIG. 5 shows another embodiment of a reusable hard metal insert -3-.
  • This insert -3- has the basic shape of a truncated pyramid.
  • a lasting profile -4- is introduced into each of the four lateral surfaces, which enables the insert -3- to be used four times.
  • Corresponding baffles on the lasting profile -4- are used to support the insert -3- on the rear contact surface of the correspondingly adapted recess -6- of the associated base body -1- of the lasting jaw, which at the same time largely prevent the direct collision of the cutting edges even when improperly adjusted.
  • Such a design of a hard metal insert -3- is particularly suitable for smaller machines for the production of smaller nail types, where lower loads occur.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Liquid Crystal (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Glass Compositions (AREA)
  • Table Equipment (AREA)

Abstract

The invention relates to pinch-pointing jaws for nail making machines, comprising an elongate prismatic main body (1) of trapezoidal cross-section. A reversible and/or exchangeable insert (3) composed of wear-resistant material into which the pinch-pointing profile (4) is machined is arranged in a recess (6) in the end of the main body (1) and screwed to the main body (1). The recess (6) has lateral and/or rearward bearing surfaces and a bearing surface inclined at an angle of between 10 DEG and 30 DEG to the bottom surface of the main body (1). <IMAGE>

Description

Die Erfindung betrifft einen Zwickbacken für Maschinen zur Nagelherstellung, bestehend aus einem länglichen, prismenförmigen Grundkörper mit trapezförmigem Querschnitt, dessen eines Ende einen auswechselbaren prismatischen Einsatz aus verschleißfestem Material aufweist, der an mindestens einer Seitenfläche mit einem Zwickprofil zur Umformung und Abtrennung des Nagelendes versehen ist.The invention relates to a lasting jaw for machines for nail production, consisting of an elongated, prism-shaped base body with a trapezoidal cross section, one end of which has an exchangeable prismatic insert made of wear-resistant material, which is provided on at least one side surface with a lasting profile for shaping and separating the nail end.

Derartige Zwickbacken werden in Maschinen, in denen Draht zu Nägeln umgeformt wird, paarweise eingesetzt. Sie sind dort so angeordnet, daß sich die Zwickprofile der Zwickbacken gegenüberliegen. Im Zuge des Arbeitsablaufes werden die Zwickbacken zusammengeführt und geöffnet. Beim Zusammenführen der Zwickbacken wird zuerst die Nagelspitze angeformt und dann der Nagel auf die gewünschte Nagellänge abgezwickt. Das speziell ausgeführte Zwickprofil der Zwickbacken bewirkt also eine umformende und eine schneidende Operation.Such jaws are used in pairs in machines in which wire is formed into nails. They are arranged there so that the lasting profiles of the lasting jaws lie opposite one another. In the course of the workflow, the lasting jaws are brought together and opened. When the jaws are brought together, the tip of the nail is first molded on and then the nail is pinched off to the desired nail length. The specially designed pinch profile of the pinch jaws results in a reshaping and a cutting operation.

Die Zwickbacken wurden bisher großteils aus Stahl gefertigt. Aufgrund der eingeschränkten Verschleißfestigkeit von Stahl weisen sie jedoch nur eine begrenzte Standzeit auf. Ist der Verschleiß des Zwickprofils unzulässig hoch, müssen die Zwickbacken ausgewechselt werden.The pinch jaws were previously largely made of steel. However, due to the limited wear resistance of steel, they only have a limited service life. If the wear of the lasting profile is inadmissibly high, the lasting jaws must be replaced.

Um die Verschleißfestigkeit der Zwickbacken zu erhöhen, ist man in beschränktem Ausmaß dazu übergegangen, das stirnseitige Ende des Werkzeuges, in welches das Zwickprofil eingearbeitet ist, getrennt aus verschleißfesterem Material, z. B. Hartmetall, herzustellen und diesen Teil mit dem Grundkörper zu verlöten. Die Kosten eines derartigen Werkzeuges sind aufgrund eines wesentlich aufwendigeren Herstellungsverfahrens im Vergleich zu einem völlig aus Stahl bestehenden Zwickbacken um einiges höher. Die Standzeit eines derartig mit Hartmetall bestückten Zwickbackens ist bestenfalls zehnmal so hoch, wie diejenige eines Stahlzwickbackens, obwohl allein von den Materialeigenschaften her die Standzeit eines derartigen Zwickbackens höher liegen könnte. Daß gegenüber reinen Stahlwerkzeugen bestenfalls die zehnfache Standzeit erreicht werden kann, ist vor allem darin begründet, daß es oft zu einem vorzeitigen Ausfall des mit dem Hartmetallende verlöteten Zwickbackens durch Risse aufgrund von Lötspannungen in der Lötverbindung kommt. Zu weiteren frühzeitigen Ausfällen der mit Hartmetall bestückten Zwickbacken kommt es oft schon in der Einstellphase der Werkzeuge aufgrund einer ungenauen Einstellung durch Absplitterungen am empfindlichen Zwickprofil.In order to increase the wear resistance of the lasting jaws, it has been adopted to a limited extent to separate the front end of the tool, into which the lasting profile is incorporated, from more wear-resistant material, e.g. B. hard metal, and to solder this part to the base body. The cost of such a tool is considerably higher due to a much more complex manufacturing process compared to a pinch jaw made entirely of steel. The service life of a such a pinch jaw equipped with hard metal is at best ten times as high as that of a steel pinch jaw, although the material properties could make the life of such a pinch jaw longer. The fact that at best ten times the service life can be achieved compared to pure steel tools is mainly due to the fact that the gusset jaws soldered to the hard metal end often fail prematurely due to cracks due to soldering stresses in the soldered connection. Further premature failures of the pinch jaws equipped with hard metal often occur already in the setting phase of the tools due to inaccurate setting due to chips on the sensitive pinch profile.

Bei einem Verschleiß des Zwickprofiles ist eine Nachbearbeitung sehr aufwendig und nur mit Spezialeinrichtungen möglich, so daß ihre Zweckmäßigkeit in Frage gestellt ist.If the gusset profile wears out, post-processing is very complex and only possible with special equipment, so that its usefulness is questioned.

Aufgrund der hohen Genauigkeitsforderungen der Maschinen bzw. Präzisionsnägel müssen die Zwickbacken immer paarweise gefertigt und nachgearbeitet werden. Daher werden in der Praxis auch bei frühzeitigem Ausfall oder zu großem Verschleiß nur eines Zwickbackens immer beide Zwickbacken komplett ausgetauscht.Due to the high accuracy requirements of the machines or precision nails, the lasting jaws must always be manufactured and reworked in pairs. Therefore, in practice, even in the event of early failure or excessive wear of just one jaw, both jaws are always completely replaced.

Dadurch kommt es vielfach zu einem recht ungünstigen Preis-/Leistungsverhältnis, so daß sich derartige mit Hartmetall bestückte Zwickbacken nicht in größerem Umfang durchgesetzt haben.This often leads to a very unfavorable price / performance ratio, so that such pinch jaws equipped with hard metal have not become widely accepted.

Die DE-OS 28 20 259 beschreibt eine Maschine zur Nagelherstellung, bei der die Zwickbacken an einem Ende einen Einsatz aus verschleißfestem Material aufweisen. Der Einsatz ist an der Stirnseite mit einem Zwickprofil zur Umformung und Abtrennung des Nagels versehen und in einer Ausnehmung des Zwickbackens mit einer Schraube und einem keilförmigen Klemmstück festgeklemmt.DE-OS 28 20 259 describes a machine for nail production, in which the lasting jaws have an insert made of wear-resistant material at one end. The insert is provided on the front with a lasting profile for forming and separating the nail and clamped in a recess in the lasting jaw with a screw and a wedge-shaped clamping piece.

Nachteilig dabei ist die mehrteilige platzaufwendige Ausgestaltung der Klemmvorrichtung. Darüberhinaus können mit einer derartigen Klemmvorrichtung keine mehrfach verwendbaren Einsätze geklemmt werden, die an allen Seitenflächen ein Zwickprofil aufweisen.The disadvantage here is the multi-part, space-consuming design of the clamping device. In addition, such a clamping device cannot be used to clamp reusable inserts which have a lasting profile on all side surfaces.

Aus der EP-A2-0 406 202 ist ein Nagelschlagbacken zur Formung des Nagelkopfes bekannt. Ein Ende des Grundkörpers ist geschlitzt und mit einer Ausnehmung versehen, die zur Aufnahme eines im wesentlichen zylinderförmigen Einsatzes aus verschleißfestem Material mit mehreren Spannrillen in der Mantelfläche dient. Der Einsatz wird im Grundkörper durch eine den Schlitz durchsetzende Spannschraube festgeklemmt.From EP-A2-0 406 202 a nail beating jaw for shaping the nail head is known. One end of the base body is slotted and provided with a recess which serves to receive an essentially cylindrical insert made of wear-resistant material with a plurality of clamping grooves in the lateral surface. The insert is clamped in the base body by means of a tensioning screw passing through the slot.

Der Erfindung liegt die Aufgabe zugrunde, einen Zwickbacken für Maschinen zur Nagelherstellung mit einem auswechselbaren Einsatz aus verschleißfestem Material zu schaffen, der gegenüber bekannten Ausführungen eine einfachere und platzsparendere Klemmung des Einsatzes am Grundkörper ermöglicht und der auch eine Klemmung von Einsätzen mit einem Zwickprofil an allen Seitenflächen erlaubt.The invention has for its object to provide a lasting jaw for machines for nail production with an interchangeable insert made of wear-resistant material, which allows a simpler and more space-saving clamping of the insert on the base body compared to known designs and also a clamping of inserts with a lasting profile on all side surfaces allowed.

Erfindungsgemäß wird dies dadurch erreicht, daß der Einsatz in einer stirnseitigen Ausnehmung des Grundkörpers, mit seitlichen und/oder rückwärtigen Anlageflächen sowie mit einer unter einem Winkel zwischen 10° und 30° zur Bodenfläche des Grundkörpers geneigten Auflagefläche, angeordnet und über eine den Einsatz durchsetzende Bohrung mit dem Grundkörper verschraubbar ist.According to the invention, this is achieved in that the insert is arranged in an end-side recess of the base body, with lateral and / or rear contact surfaces and with a support surface inclined at an angle between 10 ° and 30 ° to the base surface of the base body, and via a bore penetrating the insert can be screwed to the base body.

Auf diese Art und Weise kann der Einsatz aus verschleißfestem Material gezielt klein dimensioniert und sowohl mit einem oder mehreren nacheinander einsetzbaren Zwickprofilen versehen werden. Das Preis-/Leistungsverhältnis gegenüber Zwickbacken mit einem angelöteten Hartmetallende liegt dadurch um vieles günstiger. Die spezielle Aufnahme und Befestigung des Einsatzes gewährleistet, daß beim Austausch oder beim Umsetzen des Einsatzes die Fertigung nur kurzzeitig unterbrochen ist und daß keine neuerlichen Nachstell- bzw. Einstellarbeiten erforderlich sind.
Auch die Umstellung auf andere Nagelprofile ist in weiten Bereichen nur durch Auswechseln des Einsatzes möglich, ohne daß die Grundkörper der Zwickbacken ausgetauscht werden müssen. Die Grundkörper selbst unterliegen praktisch keinem Verschleiß und sind daher über einen sehr langen Zeitraum verwendbar. Auch bei einer vorzeitigen Zerstörung des Einsatzes durch schlechte Einstellung oder unsachgemäße Bedienung wird in der Regel der Grundkörper nicht beschädigt.In this way, the insert made of wear-resistant material can be specifically dimensioned small and can be provided with one or more lasting profiles that can be used one after the other. The price / performance ratio compared to pinch jaws with a soldered hard metal end is much cheaper. The special mounting and attachment of the insert ensures that the production is only briefly interrupted when replacing or moving the insert and that no new readjustment or adjustment work is required.
The changeover to other nail profiles is only possible in large areas by changing the insert, without having to replace the base body of the lasting jaws. The basic bodies themselves are practically not subject to wear and can therefore be used over a very long period. Even if the insert is destroyed prematurely due to poor adjustment or improper operation, the base body is generally not damaged.

Durch die spezielle Ausgestaltung der Ausnehmung im Grundkörper wird der Einsatz aus verschleißfestem Material vom Grundkörper gut abgestützt, so daß die beim Anformen der Nagelspitze und beim Abzwicken des Nagels auftretenden Kräfte vom Grundkörper voll aufgenommen werden, ohne daß die Befestigungsschraube belastet wird. Die Schraube kann dementsprechend klein dimensioniert werden und dient lediglich der Positionierung und dem Festhalten des Einsatzes in der Ausnehmung.Due to the special design of the recess in the base body, the insert made of wear-resistant material is well supported by the base body, so that the forces occurring when the nail tip is formed and when the nail is pinched off are fully absorbed by the base body without the fastening screw being loaded. The screw can therefore be dimensioned small and is only used for positioning and holding the insert in the recess.

Als besonders vorteilhaft für den erfindungsgemäßen Zwickbacken hat sich eine Neigung der Auflagefläche für den Einsatz zur Bodenfläche des Grundkörpers im Bereich von etwa 20° bewährt.An inclination of the support surface for use in relation to the base surface of the base body in the range of approximately 20 ° has proven particularly advantageous for the lasting jaws according to the invention.

In einer weiteren besonders vorteilhaften Ausgestaltung der Erfindung erfolgt die Verschraubung des Einsatzes mit dem Grundkörper über eine Senkkopfschraube, wobei die Achse der Gewindebohrung im Grundkörper und die Achse der Senkbohrung im Einsatz in Längsrichtung des Grundkörpers um einen Abstand gegeneinander versetzt sind, so daß der Einsatz beim Festziehen der Schraube gegen die Auflagefläche und gleichzeitig gegen die rückseitige(n) Anlagefläche(n) der Ausnehmung des Grundkörpers gepreßt wird.In a further particularly advantageous embodiment of the invention, the insert is screwed to the base body by means of a countersunk screw, the axis of the threaded bore in the base body and the axis of the counterbore in use being offset from one another by a distance in the longitudinal direction of the base body, so that use in Tightening the screw against the support surface and at the same time against the rear (s) contact surface (s) of the recess of the base body is pressed.

Auf diese Art und Weise wird eine besonders gute, weitgehend unveränderliche Positionierung des Einsatzes im Grundkörper erreicht.In this way, a particularly good, largely unchangeable positioning of the insert in the base body is achieved.

Wird der Einsatz nur mit einem Zwickprofil versehen, hat es sich bewährt, den Einsatz mit einer quaderförmigen Grundform zu gestalten und die dem stirnseitig eingearbeiteten Zwickprofil gegenüberliegende Rückfläche mit stark abgerundeten Seitenkanten zu versehen. Dadurch wird eine besonders vorteilhafte Fertigung des Einsatzes gewährleistet, ohne daß die sichere Anlage und Auflage des Einsatzes in der Ausnehmung des Grundkörpers nachteilig beeinflußt wird.If the insert is only provided with a lasting profile, it has proven useful to design the insert with a cuboid basic shape and to provide the rear surface opposite the end profile incorporated in the front with strongly rounded side edges. This ensures a particularly advantageous production of the insert without the safe contact and support of the insert being adversely affected in the recess in the base body.

Ist es vorgesehen, den Einsatz mehrfach umsetzbar zu gestalten, hat sich eine tetraederstumpfförmige oder pyramidenstumpfförmige Grundform mit in die Seitenflächen eingearbeiteten Zwickprofilen besonders bewährt. Dadurch wird nach dem Ersteinsatz eine zweimalige oder dreimalige Umsetzung des Einsatzes ermöglicht.If it is provided that the insert can be implemented multiple times, a truncated-tetrahedral or truncated-pyramid shape with gusset profiles incorporated into the side surfaces has proven particularly useful. This means that the assignment can be implemented twice or three times after the first use.

Als Material für den Einsatz aus verschleißfestem Material ist vor allem Hartmetall geeignet, aber auch die Verwendung anderer verschleißfester Materialien ist nicht auszuschließen.Hard metal is particularly suitable as a material for use from wear-resistant material, but the use of other wear-resistant materials cannot be ruled out.

Nachfolgend wird die Erfindung anhand von Figuren näher erläutert.The invention is explained in more detail below with reference to figures.

Es zeigen:

Figur 1
einen erfindungsgemäßen Zwickbacken mit einem quaderförmigen Hartmetalleinsatz in perspektivischer Ansicht
Figur 2
die Einzelteile des Zwickbackens nach Anspruch 1 in perspektivischer Ansicht
Figur 3
den Zwickbacken nach Figur 1 im Schnitt A-A
Figur 4
die Variante eines Hartmetalleinsatzes mit drei Zwickprofilen
Figur 5
eine weitere Variante eines Hartmetalleinsatzes mit vier Zwickprofilen
Show it:
Figure 1
a lasting jaw according to the invention with a cuboid-shaped hard metal insert in a perspective view
Figure 2
the individual parts of the lasting jaw according to claim 1 in a perspective view
Figure 3
the pinch jaws of Figure 1 in section AA
Figure 4
the variant of a hard metal insert with three lasting profiles
Figure 5
another variant of a hard metal insert with four lasting profiles

Die Figuren 1 - 3 zeigen einen erfindungsgemäßen Zwickbacken, aus einem länglichen, prismenförmigen Grundkörper -1- aus Stahl. Die Seitenflächen des Grundkörpers -1- sind je nach Maschinentype in der die Zwickbacken eingesetzt werden jeweils 10° bzw. 15° zueinander geneigt, so daß der Grundkörper -1-einen trapezförmigen Querschnitt aufweist. An seinem vorderen Ende weist der Grundkörper -1- eine schräge Abflachung mit einer Ausnehmung -6- zur Aufnahme eines quaderförmigen Einsatzes -3- aus Hartmetall auf, der mit dem Grundkörper -1- verschraubbar ist. Die Ausnehmung -6- weist zwei seitliche, parallel in Längsrichtung des Grundkörpers -1- verlaufende Anlageflächen auf, die durch eine rückseitige Anlagefläche miteinander verbunden sind. Die bodenseitige Auflagefläche ist unter einem Winkel α von 20° zur Grundfläche des Grundkörpers -1- geneigt, wodurch eine gute Abstützung des Einsatzes -3-durch den Grundkörper -1- gewährleistet ist. Die Ausnehmung -6- ist etwas kürzer als die Länge des Einsatzes -3- ausgeführt, so daß dieser an der Stirnseite des Grundkörpers -1- geringfügig vorsteht. Im rückwärtigen Bereich der Auflagefläche der Ausnehmung -6- ist zum Festschrauben des Hartmetalleinsatzes -3- eine Gewindebohrung -7- senkrecht zur Auflagefläche in den Grundkörper -1- eingebracht. An der Stirnseite des Hartmetalleinsatzes -3- ist das Zwickprofil -4- eingebracht. Die spezielle Ausführung des Zwickprofiles -4- ermöglicht beim Zusammenführen der Zwickbacken in einem Arbeitsgang die Nagelspitze auszuformen und gleichzeitig das ausgequetschte Material und das Nagelende vom Draht abzuzwicken. Der Hartmetalleinsatz -3- ist zur Verbindung mit dem Grundkörper -1- durch eine Befestigungsschraube -2- mit einer angesenkten Bohrung -5- versehen. Die dem Zwickprofil -4- gegenüberliegende Rückfläche weist stark abgerundete Seitenkanten auf. An der Bodenfläche des Hartmetalleinsatzes -3- ist eine Freistellungsfase von 45° zur Rückfläche vorgesehen, wodurch die exakte Auflage des Einsatzes -3- an der Auflagefläche sichergestellt ist.Figures 1-3 show a lasting jaw according to the invention, made of an elongated, prism-shaped base body -1- made of steel. The side surfaces of the base body -1- are inclined 10 ° or 15 ° to each other, depending on the machine type in which the jaws are used, so that the base body -1-has a trapezoidal cross section. At its front end, the base body -1- has an oblique flattening with a recess -6- for receiving a cuboid insert -3- made of hard metal, which can be screwed to the base body -1-. The recess -6- has two lateral contact surfaces which run parallel in the longitudinal direction of the base body -1- and which are connected to one another by a rear contact surface. The base-side support surface is inclined at an angle α of 20 ° to the base of the base body -1-, which ensures good support of the insert -3-by the base body -1-. The recess -6- is somewhat shorter than the length of the insert -3-, so that it protrudes slightly on the end face of the base body -1-. In the rear area of the support surface of the recess -6- a threaded hole -7- is made in the base body -1- perpendicular to the support surface for screwing the hard metal insert -3-. The lasting profile -4- is introduced on the end face of the hard metal insert -3-. The special design of the lasting profile -4- allows the nail tip to be formed in one operation when the lasting jaws are brought together and at the same time the pinched material and the nail end are pinched off the wire. The hard metal insert -3- is provided with a countersunk hole -5- for connection to the base body -1- by means of a fastening screw -2-. The back surface opposite the lasting profile -4- has strongly rounded side edges. On the bottom surface of the hard metal insert -3- there is an exemption chamfer of 45 ° to the rear surface, which ensures the exact support of the insert -3- on the contact surface.

Die Achse der Gewindebohrung -7- im Grundkörper -1- und die Achse der angesenkten Bohrung -5- im Hartmetalleinsatz -3- sind in Längsrichtung des Grundkörpers -1- gesehen um einen Abstand -d- gegeneinander versetzt, so daß beim Anzug der Befestigungsschraube -2- eine Flächenpressung zwischen der Bodenfläche des Hartmetalleinsatzes -3- und der Auflagefläche in der Ausnehmung -6- und gleichzeitig ein Anpressen des Einsatzes -3- an die rückseitige Anlagefläche der Ausnehmung -6- erfolgt.The axis of the threaded bore -7- in the base body -1- and the axis of the countersunk bore -5- in the hard metal insert -3- are offset in the longitudinal direction of the base body -1- by a distance -d- so that when the fastening screw is tightened -2- there is a surface pressure between the bottom surface of the hard metal insert -3- and the contact surface in the recess -6- and at the same time the insert -3- is pressed against the rear contact surface of the recess -6-.

Figur 4 zeigt die Variante eines Hartmetalleinsatzes -3- der mehrfach verwendbar ist.
Der Einsatz -3- weist die Grundform eines Tetraederstumpfes auf. In jede der drei Mantelflächen ist ein Zwickprofil -4- eingebracht. Auf diese Weise ist eine dreifache Verwendung des Einsatzes -3- möglich. Bedingt durch die tetraederstumpfförmige Grundform des Einsatzes -3- weist die entsprechend angepaßte Ausnehmung -6- im Grundkörper -1- des für einen derartigen Einsatz -3- geeigneten Zwickbackens zwei unter einem Winkel von 60° verlaufende rückseitige Anlageflächen auf. Dadurch wirkt der auf diese Anlageflächen wirkende Arbeitsdruck gegen die im Zwickprofil -4- des Einsatzes auftretende Kerbwirkung, wodurch diese Ausführung eines Einsatzes -3- auch höheren Belastungen standhalten kann.Figure 4 shows the variant of a hard metal insert -3- which can be used several times.
The insert -3- has the basic shape of a tetrahedral stump. A lasting profile -4- is introduced into each of the three lateral surfaces. In this way, the insert -3- can be used three times. Due to the tetrahedron-shaped basic shape of the insert -3-, the correspondingly adapted recess -6- in the base body -1- of the jaws suitable for such an insert -3- has two rear contact surfaces running at an angle of 60 °. As a result, the working pressure acting on these contact surfaces counteracts the notch effect occurring in the pinch profile -4- of the insert, as a result of which this type of insert -3- can also withstand higher loads.

Figur 5 zeigt eine andere Ausführung eines mehrfach verwendbaren Hartmetalleinsatzes -3-. Dieser Einsatz -3- weist die Grundform eines Pyramidenstumpfes auf. In jede der vier Mantelflächen ist ein Zwickprofil -4-eingebracht, wodurch eine vierfache Verwendung des Einsatzes -3- ermöglicht wird. Zur Abstützung des Einsatzes -3- an der rückseitigen Anlagefläche der entsprechend angepaßten Ausnehmung -6- des zugehörigen Grundkörpers -1- des Zwickbackens dienen entsprechende Prallflächen am Zwickprofil -4-, die gleichzeitig auch bei unsachgemäßer Einstellung das direkte Zusammenstoßen der Schneiden weitgehend verhindern. Eine derartige Ausführung eines Hartmetalleinsatzes -3- ist insbesondere für kleinere Maschinen zur Herstellung kleinerer Nageltypen, wo geringere Belastungen auftreten, geeignet.FIG. 5 shows another embodiment of a reusable hard metal insert -3-. This insert -3- has the basic shape of a truncated pyramid. A lasting profile -4-is introduced into each of the four lateral surfaces, which enables the insert -3- to be used four times. Corresponding baffles on the lasting profile -4- are used to support the insert -3- on the rear contact surface of the correspondingly adapted recess -6- of the associated base body -1- of the lasting jaw, which at the same time largely prevent the direct collision of the cutting edges even when improperly adjusted. Such a design of a hard metal insert -3- is particularly suitable for smaller machines for the production of smaller nail types, where lower loads occur.

Claims (7)

  1. Pinch-pointing jaws for machines for manufacturing nails, consisting of an elongated, prism-shaped base body (1) of trapezoidal cross-section, one end of which has a replaceable prismatic insert made of wear-resistant material, said insert being provided on at least one lateral surface with a pinch-pointing profile for reshaping and severing the end of the nail,
    characterised in that
    the insert is arranged in a frontal recess (6) of the base body (1) with lateral and/or rear locating surfaces and also with a supporting surface inclined at an angle between 10° and 30° in relation to the base surface of the base body (1) and is capable of being screwed together with the base body (1) by way of a bore passing through the insert.
  2. Pinch-pointing jaws for machines for manufacturing nails according to Claim 1, characterised in that the supporting surface for the insert is inclined at an angle (α) of about 20° in relation to the base surface of the base body (1).
  3. Pinch-pointing jaws for machines for manufacturing nails according to Claim 1 or 2, characterised in that the insert (3) and the base body (1) are screwed together by means of a countersunk screw (2), whereby the axis of the threaded bore (7) in the base body (1) and the axis of the countersunk bore (5) in the insert (3) are offset in relation to one another in the longitudinal direction of the base body (1) by a distance (d) so that the insert (3) is pressed against the rear locating surface(s) of the recess (6) of the base body (1) when the screw (2) is tightened.
  4. Insert (3) for pinch-pointing jaws for machines for manufacturing nails according to one of Claims 1 - 3, characterised in that it has a substantially parallelepipedic basic shape with sloping front and rear surfaces, whereby the pinch-pointing profile (4) is incorporated into the front surface and the front edges on the rear surface are rounded off.
  5. Insert (3) for pinch-pointing jaws for machines for manufacturing nails according to one of Claims 1 - 3, characterised in that it has the basic shape of a tetrahedron frustrum and all three lateral surfaces are provided with a pinch-pointing profile (4).
  6. Insert (3) for pinch-pointing jaws for machines for manufacturing nails according to one of Claims 1 - 3, characterised in that it has the basic shape of a pyramid frustrum and all four lateral surfaces are provided with a pinch-pointing profile (4).
  7. Insert (3) for pinch-pointing jaws for machines for manufacturing nails according to one of Claims 4 - 6, characterised in that it consists of hard metal.
EP92200724A 1991-03-20 1992-03-13 Pinch-pointing jaws Expired - Lifetime EP0504995B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0061891A AT397218B (en) 1991-03-20 1991-03-20 Pinch
AT618/91 1991-03-20

Publications (2)

Publication Number Publication Date
EP0504995A1 EP0504995A1 (en) 1992-09-23
EP0504995B1 true EP0504995B1 (en) 1994-09-28

Family

ID=3495359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92200724A Expired - Lifetime EP0504995B1 (en) 1991-03-20 1992-03-13 Pinch-pointing jaws

Country Status (5)

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EP (1) EP0504995B1 (en)
AT (2) AT397218B (en)
DE (1) DE59200553D1 (en)
DK (1) DK0504995T3 (en)
ES (1) ES2062861T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7004846B2 (en) 2001-08-13 2006-02-28 Kennametal Inc. Wear resistant nail manufacturing tool inserts

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004101194A1 (en) * 2003-05-14 2004-11-25 Enkotec A/S Inhibiting metal fatigue in a tool secured in a tool holder
DE102016014588A1 (en) * 2016-12-08 2018-06-14 Unotech Gmbh Wire deflection with carbide insert

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD40525A (en) *
US3815166A (en) * 1972-10-05 1974-06-11 Illinois Tool Works Die holder assembly
JPS53137859A (en) * 1977-05-09 1978-12-01 Kameo Doi Pinch pointing device
US4150451A (en) * 1978-03-01 1979-04-24 Usm Corporation Die holder assembly
AT392028B (en) * 1989-06-09 1991-01-10 Plansee Tizit Gmbh NAIL BLOWERS
SE467530B (en) * 1989-06-30 1992-08-03 Haamex Haardmetallverktyg Ab CLAUM BACK FOR SPIKE MANUFACTURING

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7004846B2 (en) 2001-08-13 2006-02-28 Kennametal Inc. Wear resistant nail manufacturing tool inserts

Also Published As

Publication number Publication date
EP0504995A1 (en) 1992-09-23
DK0504995T3 (en) 1995-04-10
ATE112194T1 (en) 1994-10-15
DE59200553D1 (en) 1994-11-03
AT397218B (en) 1994-02-25
ES2062861T3 (en) 1994-12-16
ATA61891A (en) 1993-07-15

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