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EP2839900B1 - Method and device for manufacturing a connection section with an end section as part of a tool - Google Patents

Method and device for manufacturing a connection section with an end section as part of a tool Download PDF

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Publication number
EP2839900B1
EP2839900B1 EP14161805.8A EP14161805A EP2839900B1 EP 2839900 B1 EP2839900 B1 EP 2839900B1 EP 14161805 A EP14161805 A EP 14161805A EP 2839900 B1 EP2839900 B1 EP 2839900B1
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EP
European Patent Office
Prior art keywords
connecting section
impressing
face
shaping
die
Prior art date
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EP14161805.8A
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German (de)
French (fr)
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EP2839900A1 (en
Inventor
Michael Kleine
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Mac Panther GmbH
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Mac Panther GmbH
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Publication of EP2839900A1 publication Critical patent/EP2839900A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K5/00Making tools or tool parts, e.g. pliers
    • B21K5/02Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes
    • B21K5/10Forming drill-bit shanks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12Forming profiles on internal or external surfaces

Definitions

  • the invention relates to a method for producing a connection area provided with an end face by impressing as part of a tool, in particular a drill or bit axially movably mounted in the tool holder of a hammer drill, or as part of a connecting rod, wherein the connecting portion has at least one longitudinal or longitudinal surface, of which at least one is at least partially closed to the end face of the connecting portion.
  • the invention further relates to a device for producing a connecting portion as part of a tool, in particular an axially movably mounted in the tool holder of a hammer drill or chisel by imprinting.
  • the object of the invention is therefore to provide an improved method and an improved apparatus for producing connecting sections for bars, drills and chisels.
  • the invention includes the recognition that drills and connecting rods are usually manufactured on cutting machine tools, which leads to an increased material consumption due to the resulting chips and also requires relatively long production times. Therefore, there have always been considerations to produce such connection sections by forming.
  • a method for producing a rod and a rod is described, which can be used for example as a pendulum support for a chassis in the automotive industry.
  • the EP 2 181 783 B1 proposed rod is not suitable for higher axial tensile forces, since the undercut obtained at warmer temperatures is not sufficient resistance to a molded plastic part. Since the transition from the thinner cylindrical part to the compressed thicker section is also continuous, this transition does not provide a clearly delimiting stop. Only the in FIG.
  • a drill semi-finished product or a rod with a substantially cylindrical or polygonal, in particular square, circumferential surface is provided in a step a).
  • the connecting portion is inserted into a closing die.
  • the at least one longitudinal groove is impressed by radial infeed of one or more reshaping bodies movable in the closing die, whereby an elongation of the connecting portion and in the region of the longitudinal groove a cross-sectional area reduction is effected.
  • the term "elongation" is to be understood as a change in length, in particular an increase in the length of the drill semi-finished product in a longitudinal direction.
  • the cross-sectional area reduction can be understood on the one hand as a reduction of the cross-sectional area in the region of the longitudinal groove transversely to a longitudinal direction of the drill semi-finished product but also as a reduction of the cross-sectional area in the region of the longitudinal groove along the longitudinal direction.
  • the material used preferably has a strength in a range of 800 to 1000 N / mm 2 inclusive.
  • the embossing takes place without preforming the longitudinal groove, in particular without preforming the longitudinal groove in the drill semi-finished product or the rod.
  • This is preferably carried out at a degree of deformation in the range of above 20% up to and including 45%, more preferably above 24% up to and including 38%.
  • the radially movable forming bodies are guided in recesses of the closing die.
  • a punch which, at the beginning of the stamping operation, has a distance from the end face of the connecting portion which is smaller than the elongation of the connecting portion caused by the stamping, limits the unimpeded elongation of the connecting portion.
  • a preferred distance of the punch from the end face of the connecting portion before stamping is between 0.2mm and 4.0mm. This result can also be achieved by a spring-loaded punch, which presses on the end face of the connecting portion already at the beginning of the embossing.
  • step c) additionally at least one open to the end face of the connecting portion driving groove or surface by radially advancing movable in the closing die forming bodies by means of impressions.
  • the impressing of the driving groove is preferably to be understood in such a way that the locking groove closed towards the end surface and the driving groove open towards the end surface are impressed at the same time.
  • all longitudinal grooves of the connecting portion are particularly economical and technically easy to manufacture in only one die. This is preferably done at a degree of deformation ranging from above 20% to 45% inclusive, more preferably from 25% to 40% inclusive, even more preferably from 30% to 37% inclusive.
  • step c) additionally at least one further driving groove or surface open to the end face of the connecting portion is produced in an upstream forming step by tapering, extruding or other forming methods before step c).
  • the conversion for step c) preferably takes place at a degree of deformation in the range from above 20% to and including 35%, more preferably from 23% inclusive to 32% inclusive, even more preferably from 25% to 30% inclusive.
  • the closing die has a contour facing the connecting portion, in particular inwardly directed contour which is formed corresponding to the outer contour of the connecting portion present before step c) and wherein the grooves or surfaces open to the end face of the connecting portion corresponding shape of the die or filled by filler.
  • step c) at least one driving groove or surface open to the end face of the connecting portion is produced by tapering, impressions or other forming methods in a subsequent forming step and thereby the groove produced first is formed by corresponding shaping of the die or filled by packing.
  • the generating of the driving groove open to the end surface of the connecting portion takes place at a degree of deformation of above 15% up to and including 40%, more preferably from above 18% up to and including 37%, even more preferably from 22% up to and including 32%.
  • the different degrees of deformation take into account the different cross-sectional shapes of the locking grooves and driving grooves, e.g. Grooves with a round groove bottom oppose the forming bodies significantly greater penetration resistance than grooves with an angular groove bottom.
  • step c) the embossing in step c) and or the forming of the further grooves in two or more partial forming steps takes place.
  • the forming bodies in step c) have at their edge regions formations, preferably chamfers, which limit the material flow during embossing. As a result, the edge region can be formed exactly.
  • the end face of the connecting portion in particular in the region of the laterally open longitudinal grooves to the end surface of the connecting portion, preformed, preferably funnel-shaped, opening to the end face
  • the connecting portions are embossed at both ends of a rod.
  • a further aspect of the invention relates to a device for producing a connecting portion as part of a tool, in particular a drill or bit axially movably mounted in the tool holder of a hammer drill, or as part of a rod according to the independent claim 8.
  • the device according to the invention comprises a closing die, by means of which with at least radially movable and arranged in recesses of the closing die UmformMechn locking grooves and the end surface open longitudinal grooves or surfaces are formed by stamping
  • the device according to the invention comprises a die, by means of which at least one longitudinal or longitudinal surface in the peripheral surface by extrusion or tapering is malleable, and a closing die with at least radially movable UmformMechn, by means of which at least one locking groove is formed by impressing.
  • a stamp protrudes into the closing die in the longitudinal direction of the drill semi-finished product or the rod, wherein this stamp is adjustable such that it has a distance from the end face of the connecting section at the beginning of the embossing process which is smaller than the elongation caused by the embossing of the connecting portion or as a spring-loaded punch presses on the end face of the connecting portion.
  • the forming bodies of the closing die are moved radially by conical, wedge-shaped or cam-shaped actuating members.
  • Fig. 1 shows an intermediate product of a connecting portion 100, which is manufactured according to an embodiment of the method according to the invention.
  • the connecting portion 100 forms a part of a drill semi-finished product 102 having a cylindrical circumferential surface 104.
  • the connecting portion 100 has an end surface 106.
  • Fig. 1 shows the inventively manufactured connecting portion 100 in a raw state 110 before the stamping of longitudinal grooves.
  • the raw state 110 in the form of the drill semi-finished product 102 is provided in a method step a) of the method according to the invention for producing a connection section 100 provided with an end face 106.
  • FIGS. 2 and 4-7 show the in Fig. 1 shown connecting portion 100 as an intermediate product 120, after in a process step b) the connecting portion 100 in a closing die 128, as shown in the Figures 12 and 13 is shown, and after in a process step c) a longitudinal groove 122 has been impressed.
  • the embossing takes place without preforming the longitudinal groove 122 in the drill semi-finished product 102.
  • the embossed longitudinal groove 122 is closed to the end face 106 of the connecting portion 100 and forms a locking groove 124th
  • FIGS. 1 . 2 and 4-7 show the in the FIGS. 1 . 2 and 4-7 shown connecting portion 100 as an intermediate product 160, after in a further process step, a longitudinal groove 162 has been impressed.
  • the embossed longitudinal groove 162 is open toward the end face 106 of the connection section 100 and forms a rotational drive groove 164.
  • the impressing according to method step c) can be achieved by means of a device 126, as shown in FIG Fig. 12 in a first embodiment, or by means of a device 226 as shown in FIG FIG. 13 is shown in a second embodiment, take place.
  • the FIG. 12 13 shows the device 126 or 226 in a first state C1 before the impressing and a second state C2 during or after the impressing.
  • FIG. 12 shows the device 126 in a sectional view in the two states C1 and C2, in the viewing direction above before the impressing and below during or after the stamping.
  • the device 126 comprises a closing die 128, which has recesses 130.
  • movable in a radial direction 132 Umform stresses 134 are arranged.
  • Umform stresses 134 are arranged in the recesses 130.
  • these forming bodies 134 are delivered radially inward, locking grooves 124 are formed in the connecting portion 100.
  • elongation of the connecting portion 100 in a longitudinal direction 136 is effected.
  • the end surface 106 abuts against a punch 138, which before embossing has a distance depending on the elongation of the connecting portion 100 by the embossing to the end surface 106.
  • the Umform stresses 134 are delivered radially when the actuators 140 move in the longitudinal direction 136.
  • Fig. 13 shows the device 226 as a second embodiment.
  • the device 226 is similar to that in FIG Fig. 12 constructed device 126 constructed.
  • the same and functionally identical elements are provided with the same reference numerals.
  • the device 226 has a punch 238, which is spring-mounted by means of a spring 250 in the longitudinal direction 136.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Punching Or Piercing (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines mit einer Endfläche versehenen Verbindungabschnitts durch Einprägung als Teil eines Werkzeuges, insbesondere eines axialbeweglich in der Werkzeugaufnahme eines Bohrhammers befestigten Bohrers oder Meißels, oder auch als Teil einer Verbindungsstange, wobei der Verbindungsabschnitt mindestens eine Längsnut oder Längsfläche aufweist, von denen mindestens eine zur Endfläche des Verbindungsabschnitts hin zumindest teilweise geschlossen ist. Die Erfindung betrifft ferner eine Vorrichtung zur Fertigung eines Verbindungsabschnitts als Teil eines Werkzeugs, insbesondere eines axialbeweglich in der Werkzeugaufnahme eines Bohrhammers befestigten Bohrers oder Meißels durch Einprägung.The invention relates to a method for producing a connection area provided with an end face by impressing as part of a tool, in particular a drill or bit axially movably mounted in the tool holder of a hammer drill, or as part of a connecting rod, wherein the connecting portion has at least one longitudinal or longitudinal surface, of which at least one is at least partially closed to the end face of the connecting portion. The invention further relates to a device for producing a connecting portion as part of a tool, in particular an axially movably mounted in the tool holder of a hammer drill or chisel by imprinting.

Verfahren und Vorrichtungen der eingangs genannten Art sind grundsätzlich bekannt.Methods and devices of the type mentioned are basically known.

Aufgabe der Erfindung ist daher, ein verbessertes Verfahren sowie eine verbesserte Vorrichtung zur Herstellung von Verbindungsabschnitten für Stangen, Bohrer und Meißel bereitzustellen.The object of the invention is therefore to provide an improved method and an improved apparatus for producing connecting sections for bars, drills and chisels.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren gemäß Anspruch 1 gelöst.This object is achieved by a method according to claim 1.

Die Erfindung umfasst die Erkenntnis, dass Bohrer und Verbindungsstangen üblicherweise auf spanenden Werkzeugmaschinen gefertigt werden, was zu einem erhöhten Materialverbrauch aufgrund der anfallenden Späne führt und zudem verhältnismäßig lange Fertigungszeiten benötigt. Deshalb hat es immer wieder Überlegungen gegeben, derartige Verbindungsabschnitte mittels Umformung herzustellen. In der EP 2 181 783 B1 wird ein Verfahren zur Herstellung einer Stange sowie eine Stange beschrieben, welche beispielsweise als Pendelstütze für ein Fahrwerk im Automobilbau eingesetzt werden kann. Es hat sich dabei jedoch gezeigt, dass die in der EP 2 181 783 B1 vorgeschlagene Stange nicht für höhere axiale Zugkräfte geeignet ist, da der erzielte Hinterschnitt bei wärmeren Temperaturen einem umspritzten Kunststoffteil nicht ausreichend Widerstand entgegensetzt. Da der Übergang vom dünneren zylindrischen Teil zum gestauchten dickeren Abschnitt zudem kontinuierlich verläuft, stellt dieser Übergang keinen klar begrenzenden Stopp bzw. Anschlag bereit. Lediglich die in Figur 8 der EP 2 181 783 B1 dargestellte Lösung hat sich in der Praxis auch für höhere Belastungen bewehrt. Dabei muss der Hinterschnitt in einem separaten Arbeitsgang mittels Walzen erzeugt werden, was zu erhöhten Kosten führt. Zur Fertigung von Verbindungsabschnitten bei Hammerbohrern (dort meist als Einsteckende bezeichnet) - insbesondere sogenannten SDS-plus-Bohrern - sind Lösungen zur Fertigung mittels Umformen bekannt. Eine Fertigung dieser Art ist in der DE 84 33 275 U1 beschrieben. Dabei werden die Nuten durch Fließpressen zur Endfläche offen eingebracht und nachträglich durch Stauchen verschlossen. In der Praxis hat sich dieser Vorschlag nicht realisieren lassen, da beim Schließen der Nuten durch Stauchen diese sich gleichfalls verformen und somit ihre Funktion nicht erfüllen können. In der DE 199 15 303 A1 wird beschrieben, das Einsteckende mit den offenen und geschlossenen Nuten durch Fließpressen oder Schmiedeverfahren herzustellen. Auch hier findet sich kein Hinweis, wie das Problem der Verformung der Nuten bei dem jeweils notwendigen zweiten Umformvorgang gelöst wird. Nach der EP 2 361 702 A1 werden zur Lösung dieses Problems Füllkörper in die Nuten eingeführt, um beim anschließenden Stauchen die Form der Nuten zu erhalten. Problematisch ist hierbei, dass für das Schließen der Nuten mittels Stauchen erhebliche axiale Kräfte benötigt werden. Im Falle, dass ein SDS-plus-Einsteckende von 10mm Durchmesser auf seiner Arbeitsseite (in Bohrrichtung gesehen) für einen Bohrer von etwa 5mm Bohrdurchmesser ausgelegt ist, ergibt sich das Problem, dass beim Stauchen der Endfläche der Abschnitt mit 5mm Bohrdurchmesser gleichfalls mit gestaucht werden kann, was beim Auswerfen des Bohrerrohlings oft zu Auswerfernadelbrüchen führt. Daher wurde in der EP 2458131 vorgeschlagen, das Schließen der Nut als Warm- oder Halbwarmumformung vorzunehmen. Hierdurch werden die benötigten Axialkräfte stark reduziert und das geschilderte Problem vermieden. Allerdings führt das Erwärmen zu einem zusätzlichen kostenintensiven Arbeitsschritt. Das Kaltaufstauchen hat auch noch einen weiteren schwerwiegenden Nachteil: durch das vorherige Einformen der Längsnuten ist die Endfläche vor dem Stauchen sehr stark gewellt und weist teilweise sogar Grat auf Beim anschließenden Stauchen verformt sich diese Endfläche derart, dass es in diesem Abschnitt zu Materialfaltungen kommt. In der z.B. durch Axialschläge des Bohrhammers höchstbelasteten Endzone des Bohrers können derartige Materialfehler zu Brüchen führen, wobei die Bruchteile oft zu Schäden des Bohrhammers führen. Weiterhin hat sich gezeigt; dass das Einformen der Längsnuten und das Schließen der Endfläche mittels Stauchen aufgrund der mit jedem Arbeitsschritt durchzuführenden großen Umformarbeit die mögliche Produktionstaktzahl begrenzt. - In der nicht vorveröffentlichten EP 13158919 wird zur Vermeidung der vorgenannten Nachteile vorgeschlagen insbesondere die Verriegelungsnuten, in mindestens zwei Schritten herzustellen. Durch die Aufteilung der Fertigung der Verriegelungsnut auf zwei Schritte wird erreicht, dass jeder Schritt mit deutlich geringerer Kraft. erfolgt. Als Nachteil dieses Verfahrens hat sich herausgestellt, dass der der Endfläche zugewandte Abschnitt der Verriegelungsnut sich nicht oder nur sehr schwer beim Stauchvorgang so Formen läßt, dass die gewünschte Kontur reproduzierbar erzeugt wird. - Insgesamt hat sich auch gezeigt, dass die in den verschiedenen Patentschriften vorgeschlagene Aufteilung zur Fertigung der Verriegelungsnuten auf mehrere Arbeitsschritte technisch schwierig zu realisieren ist, zu Mehrkosten führt und bei Fertigung auf einer Mehrstufenpresse mindestens zwei Stufen für diese Nut erforderlich sind.The invention includes the recognition that drills and connecting rods are usually manufactured on cutting machine tools, which leads to an increased material consumption due to the resulting chips and also requires relatively long production times. Therefore, there have always been considerations to produce such connection sections by forming. In the EP 2 181 783 B1 a method for producing a rod and a rod is described, which can be used for example as a pendulum support for a chassis in the automotive industry. However, it has been shown that in the EP 2 181 783 B1 proposed rod is not suitable for higher axial tensile forces, since the undercut obtained at warmer temperatures is not sufficient resistance to a molded plastic part. Since the transition from the thinner cylindrical part to the compressed thicker section is also continuous, this transition does not provide a clearly delimiting stop. Only the in FIG. 8 of the EP 2 181 783 B1 shown solution has been reinforced in practice for higher loads. In this case, the undercut must be produced in a separate operation by means of rollers, which leads to increased costs. For the production of connecting sections in hammer drills (usually referred to as shank) - in particular so-called SDS-plus drills - solutions for manufacturing by means of forming are known. A production of this kind is in the DE 84 33 275 U1 described. The grooves are introduced by extrusion to the end face open and subsequently closed by upsetting. In practice, this proposal has not been realized because when closing the grooves by upsetting these also deform and thus can not fulfill their function. In the DE 199 15 303 A1 It is described to make the male end with the open and closed grooves by extrusion or forging. Again, there is no indication as to how the problem of deformation of the grooves in the respectively necessary second forming process is solved. After EP 2 361 702 A1 are introduced to solve this problem filler in the grooves to obtain the shape of the grooves in the subsequent upsetting. The problem here is that significant axial forces are required for closing the grooves by upsetting. In the case of a SDS-plus male end of 10mm diameter on its working side (seen in the drilling direction) for a drill bit of about 5mm bore diameter is designed, there is the problem that when upsetting the end face of the section with 5mm hole diameter can also be compressed, which often leads to ejection needle breaks when ejecting the drill blank. Therefore, in the EP 2458131 proposed to make the closing of the groove as hot or warm forging. As a result, the required axial forces are greatly reduced and avoided the described problem. However, heating leads to an additional costly work step. The cold upset also has another serious disadvantage: by the previous molding of the longitudinal grooves, the end face is very strongly wavy before upsetting and sometimes even burrs on subsequent upsetting deforms this end face so that it comes to material folds in this section. In the end zone of the drill, for example, which is subjected to the greatest impact by axial impacts of the hammer drill, such material defects can lead to fractures, the fractions often leading to damage of the rotary hammer. Furthermore, it has been shown; that the shaping of the longitudinal grooves and the closing of the end surface by means of upsetting due to the large forming work to be carried out with each step limit the possible production cycle time. - In the not previously published EP 13158919 is proposed to avoid the aforementioned disadvantages, in particular the locking grooves to produce in at least two steps. By dividing the production of the locking groove to two steps is achieved that each step with significantly less force. he follows. As a disadvantage of this method has been found that the end surface facing portion of the locking groove is not or only very difficult in the upsetting process shapes so that the desired contour is generated reproducible. - Overall, it has also been shown that the proposed in the various patents division for manufacturing the locking grooves on several steps is technically difficult to implement, leads to additional costs and at least two stages for this groove are required for production on a multi-stage press.

Aus der DE 3015893 ist ein Verfahren sowie eine Vorrichtung zum Herstellen von Mitnahmenuten am Aufnahmeschaft von Bohr und Meisselwerkzeugen bekannt.From the DE 3015893 a method and an apparatus for producing driving grooves on the receiving shaft of drilling and chiselling tools is known.

Bei dem erfindungsgemäßen Verfahren wird in einem Schritt a) ein Bohrerhalbzeug oder eine Stange mit einer im Wesentlichen zylinder- oder mehreckförmigen, insbesondere quadratischen, Umfangsoberfläche bereitgestellt. In einem Schritt b) wird der Verbindungsabschnitt in eine Schließmatrize eingeführt. In einem Schritt c) wird die mindestens eine Längsnut durch radiales Zustellen von einem oder mehreren in der Schließmatrize beweglichen Umformkörpern eingeprägt, wodurch eine Längung des Verbindungsabschnittes und im Bereich der Längsnut eine Querschnittsflächenverkleinerung bewirkt wird.In the method according to the invention, a drill semi-finished product or a rod with a substantially cylindrical or polygonal, in particular square, circumferential surface is provided in a step a). In a step b), the connecting portion is inserted into a closing die. In a step c), the at least one longitudinal groove is impressed by radial infeed of one or more reshaping bodies movable in the closing die, whereby an elongation of the connecting portion and in the region of the longitudinal groove a cross-sectional area reduction is effected.

Der Begriff "Längung" ist im Rahmen der vorliegenden Erfindung bevorzugt als Längenänderung, insbesondere Erhöhung der Länge des Bohrerhalbzeugs in einer Längsrichtung, zu verstehen. Die Querschnittsflächenverkleinerung kann im Rahmen der vorliegenden Erfindung einerseits als eine Verminderung der Querschnittsfläche im Bereich der Längsnut quer zu einer Längsrichtung des Bohrerhalbzeugs aber auch als Verkleinerung der Querschnittsfläche im Bereich der Längsnut entlang der Längsrichtung verstanden werden. - Das erfindungsgemäße Verfahren ist wesentlich einfacher als die bisher vorgeschlagenen Lösungen und vermeidet deren Nachteile.Within the scope of the present invention, the term "elongation" is to be understood as a change in length, in particular an increase in the length of the drill semi-finished product in a longitudinal direction. In the context of the present invention, the cross-sectional area reduction can be understood on the one hand as a reduction of the cross-sectional area in the region of the longitudinal groove transversely to a longitudinal direction of the drill semi-finished product but also as a reduction of the cross-sectional area in the region of the longitudinal groove along the longitudinal direction. - The inventive method is much simpler than the previously proposed solutions and avoids their disadvantages.

Das verwendete Material weist bevorzugt eine Festigkeit in einem Bereich von einschließlich 800 bis einschließlich 1000 N/mm2 auf. Hierdurch können Produkte mit größerer Haltbarkeit hergestellt werden, da überraschenderweise das Einprägen auch bei diesen Festigkeiten möglich ist, indem etwa die Schließmatrize die höheren Kräfte konstruktiv durch vorgespannte Ummantelungen oder durch Hartmetallverstärkungen ertragen kann.The material used preferably has a strength in a range of 800 to 1000 N / mm 2 inclusive. As a result, products can be produced with greater durability, since surprisingly the embossing is also possible with these strengths, for example, the closing die can endure the higher forces constructive biased sheathing or hard metal reinforcements.

Gemäß einer bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens erfolgt das Einprägen ohne Vorformen der Längsnut, insbesondere ohne Vorformen der Längsnut in dem Bohrerhalbzeug oder der Stange. Dies erfolgt bevorzugt bei einem Umformgrad im Bereich von oberhalb 20 % bis einschließlich 45 %, weiter bevorzugt oberhalb von 24 % bis einschließlich 38 %.According to a preferred embodiment of the method according to the invention, the embossing takes place without preforming the longitudinal groove, in particular without preforming the longitudinal groove in the drill semi-finished product or the rod. This is preferably carried out at a degree of deformation in the range of above 20% up to and including 45%, more preferably above 24% up to and including 38%.

Nach einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens werden die radial beweglichen Umformkörper in Aussparungen der Schließmatrize geführt. Erfindungsgemäß begrenzt ein Stempel, der bei Beginn des Einprägevorgangs einen Abstand von der Endfläche des Verbindungsabschnitts hat, welcher kleiner ist als die durch die Einprägung bewirkte Längung des Verbindungsabschnitts, die ungehinderte Längung des Verbindungsabschnitts. Dadurch wird insbesondere erreicht, dass der der Endfläche zugekehrte Bereich der Längsnut präzise den Umformkörper abbildet. Ein bevorzugter Abstand des Stempels von der Endfläche des Verbindungsabschnitts vor dem Einprägen liegt zwischen 0,2mm und 4,0 mm. Dieses Ergebnis kann auch durch einen gefederten Stempel, der schon bei Beginn des Einprägens auf die Endfläche des Verbindungsabschnitts drückt, erzielt werden.According to a further preferred embodiment of the method according to the invention, the radially movable forming bodies are guided in recesses of the closing die. According to the invention, a punch which, at the beginning of the stamping operation, has a distance from the end face of the connecting portion which is smaller than the elongation of the connecting portion caused by the stamping, limits the unimpeded elongation of the connecting portion. As a result, it is achieved, in particular, that the area of the longitudinal groove facing the end face precisely reproduces the forming body. A preferred distance of the punch from the end face of the connecting portion before stamping is between 0.2mm and 4.0mm. This result can also be achieved by a spring-loaded punch, which presses on the end face of the connecting portion already at the beginning of the embossing.

Nach einer anderen bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird während des Schrittes c) zusätzlich mindestens eine zur Endfläche des Verbindungsabschnitts offene Mitnahmenut oder -fläche durch radiales Zustellen von in der Schließmatrize beweglichen Umformkörpern mittels Einprägen erzeugt. Das Einprägen der Mitnahmenut ist im Rahmen der vorliegenden Erfindung bevorzugt derart zu verstehen, dass die zur Endfläche hin geschlossene Verriegelungsnut und die zur Endfläche hin offene Mitnahmenut gleichzeitig eingeprägt werden. Auf diese Weise sind alle Längsnuten des Verbindungsabschnitts besonders wirtschaftlich und technisch einfach in nur einer Matrize zu fertigen. Dies erfolgt bevorzugt bei einem Umformgrad im Bereich von oberhalb 20 % bis einschließlich 45 %, weiter bevorzugt von einschließlich 25% bis einschließlich 40 %, noch weiter bevorzugt von einschließlich 30 % bis einschließlich 37 %.According to another preferred embodiment of the method according to the invention during step c) additionally at least one open to the end face of the connecting portion driving groove or surface by radially advancing movable in the closing die forming bodies by means of impressions. In the context of the present invention, the impressing of the driving groove is preferably to be understood in such a way that the locking groove closed towards the end surface and the driving groove open towards the end surface are impressed at the same time. In this way, all longitudinal grooves of the connecting portion are particularly economical and technically easy to manufacture in only one die. This is preferably done at a degree of deformation ranging from above 20% to 45% inclusive, more preferably from 25% to 40% inclusive, even more preferably from 30% to 37% inclusive.

In einer anderen bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird vor dem Schritt c) zusätzlich mindestens eine weitere zur Endfläche des Verbindungsabschnitts offene Mitnahmenut oder -fläche in einem vorgelagerten Umformschritt durch Verjüngen, Fließpressen oder andere Umformmethoden erzeugt. Hierbei erfolgt die Umformung für den Schritt c) bevorzugt bei einem Umformgrad im Bereich von oberhalb 20 % bis einschließlich 35 %, weiter bevorzugt von einschließlich 23 % bis einschließlich 32 %, noch weiter bevorzugt von einschließlich 25 % bis einschließlich 30 %.In another preferred embodiment of the method according to the invention, additionally at least one further driving groove or surface open to the end face of the connecting portion is produced in an upstream forming step by tapering, extruding or other forming methods before step c). In this case, the conversion for step c) preferably takes place at a degree of deformation in the range from above 20% to and including 35%, more preferably from 23% inclusive to 32% inclusive, even more preferably from 25% to 30% inclusive.

Bei einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens weist die Schließmatrize eine dem Verbindungsabschnitt zugewandte, insbesondere nach innen gerichtete Kontur auf, die korrespondierend zu der vor dem Schritt c) vorhandenen Außenkontur des Verbindungsabschnitts ausgebildet ist und wobei die zur Endfläche des Verbindungsabschnitts offenen Nuten oder Flächen durch entsprechende Ausformung der Matrize oder durch Füllkörper ausgefüllt sind.In a further preferred embodiment of the method according to the invention, the closing die has a contour facing the connecting portion, in particular inwardly directed contour which is formed corresponding to the outer contour of the connecting portion present before step c) and wherein the grooves or surfaces open to the end face of the connecting portion corresponding shape of the die or filled by filler.

In einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird nach dem Schritt c) mindestens eine zur Endfläche des Verbindungsabschnitts offene Mitnahmenut oder -fläche in einem nachgelagerten Umformschritt durch Verjüngen, Einprägen oder andere Umformmethoden erzeugt und dabei ist die zuerst erzeugte Nut durch entsprechende Ausformung der Matrize oder durch Füllkörper ausgefüllt. Das Erzeugen der zur Endfläche des Verbindungsabschnitts offenen Mitnahmenut erfolgt bei einem Umformgrad von oberhalb 15 % bis einschließlich 40 %, weiter bevorzugt von oberhalb 18 % bis einschließlich 37 %, noch weiter bevorzugt von einschließlich 22 % bis einschließlich 32 %.In a further preferred embodiment of the method according to the invention, after step c) at least one driving groove or surface open to the end face of the connecting portion is produced by tapering, impressions or other forming methods in a subsequent forming step and thereby the groove produced first is formed by corresponding shaping of the die or filled by packing. The generating of the driving groove open to the end surface of the connecting portion takes place at a degree of deformation of above 15% up to and including 40%, more preferably from above 18% up to and including 37%, even more preferably from 22% up to and including 32%.

Die unterschiedlichen Umformgrade berücksichtigen die verschiedenen Querschnittsformen der Verriegelungsnuten und Mitnahmenuten, da z.B. Nuten mit rundem Nutengrund einen deutlich größeren Eindringwiderstand den Umformkörpern entgegensetzen als Nuten mit eckigem Nutengrund.The different degrees of deformation take into account the different cross-sectional shapes of the locking grooves and driving grooves, e.g. Grooves with a round groove bottom oppose the forming bodies significantly greater penetration resistance than grooves with an angular groove bottom.

Bei einer noch weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens erfolgt das Einprägen in Schritt c) und oder das Umformen der weiteren Nuten in zwei oder mehr Teilformschritten.In yet another preferred embodiment of the method according to the invention, the embossing in step c) and or the forming of the further grooves in two or more partial forming steps takes place.

In einer bevorzugten Fortbildung des erfindungsgemäßen Verfahrens weisen die Umformkörper in Schritt c) an ihren Randbereichen Ausformungen, bevorzugt Fasen, auf, die den Materialfluss beim Einprägen begrenzen. Hierdurch kann der Randbereich exakt ausgeformt werden.In a preferred embodiment of the method according to the invention, the forming bodies in step c) have at their edge regions formations, preferably chamfers, which limit the material flow during embossing. As a result, the edge region can be formed exactly.

Nach einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird die Endfläche des Verbindungsabschnitts, insbesondere im Bereich der späteren zur Endfläche des Verbindungsabschnitts offenen Längsnuten, sich, bevorzugt trichterförmig, zur Endfläche öffnend vorgeformtAccording to a further preferred embodiment of the method according to the invention, the end face of the connecting portion, in particular in the region of the laterally open longitudinal grooves to the end surface of the connecting portion, preformed, preferably funnel-shaped, opening to the end face

Bei einer noch weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens werden die Verbindungsabschnitte an beiden Enden einer Stange eingeprägt.In yet another preferred embodiment of the method according to the invention, the connecting portions are embossed at both ends of a rod.

Ein weiterer Aspekt der Erfindung betrifft eine Vorrichtung zur Fertigung eines Verbindungsabschnitts als Teil eines Werkzeugs, insbesondere eines axialbeweglich in der Werkzeugaufnahme eines Bohrhammers befestigten Bohrers oder Meißels, oder als Teil einer Stange gemäß dem unabhängigen Anspruch 8.A further aspect of the invention relates to a device for producing a connecting portion as part of a tool, in particular a drill or bit axially movably mounted in the tool holder of a hammer drill, or as part of a rod according to the independent claim 8.

Dabei weist der Verbindungsabschnitt eine Endfläche und eine im Wesentlichen zylinder- oder mehrkantförmige, insbesondere quadratische, Umfangsoberfläche auf. Die Vorrichtung umfasst ferner eine Schließmatrize mit mindestens einem, zumindest radial beweglichen und in Aussparungen der Schließmatrize angeordneten Umformkörper, mittels welchem mindestens eine Verriegelungsnut durch Einprägen formbar ist.In this case, the connecting portion has an end surface and a substantially cylindrical or polygonal, in particular square, peripheral surface. The device further comprises a closing die with at least one, at least radially movable and arranged in recesses of the closing die forming body, by means of which at least one locking groove is formed by impressing.

Gemäß einer bevorzugten Ausführungsform umfasst die erfindungsgemäße Vorrichtung eine Schließmatrize, mittels welcher mit zumindest radial beweglichen und in Aussparungen der Schließmatrize angeordneten Umformkörpern Verriegelungsnuten und zur Endfläche offene Längsnuten oder-flächen durch Einprägen formbar sindAccording to a preferred embodiment, the device according to the invention comprises a closing die, by means of which with at least radially movable and arranged in recesses of the closing die Umformkörpern locking grooves and the end surface open longitudinal grooves or surfaces are formed by stamping

Nach einer weiteren bevorzugten Ausführungsform umfasst die erfindungsgemäße Vorrichtung eine Matrize, mittels welcher mindestens eine Längsnut oder Längsfläche in die Umfangsoberfläche durch Fließpressen oder Verjüngen formbar ist, und eine Schließmatrize mit zumindest radial beweglichen Umformkörpern, mittels welcher mindestens eine Verriegelungsnut durch Einprägen formbar ist.According to a further preferred embodiment, the device according to the invention comprises a die, by means of which at least one longitudinal or longitudinal surface in the peripheral surface by extrusion or tapering is malleable, and a closing die with at least radially movable Umformkörpern, by means of which at least one locking groove is formed by impressing.

In der erfindungsgemäßen Vorrichtung ragt in die Schließmatrize ein Stempel in Längsrichtung des Bohrerhalbzeugs oder der Stange, wobei dieser Stempel derart einstellbar ist, dass er bei Beginn des Einprägevorgangs einen Abstand von der Endfläche des Verbindungsabschnitts hat, welcher kleiner ist als die durch die Einprägung bewirkte Längung des Verbindungsabschnitts oder als gefederter Stempel auf die Endfläche des Verbindungsabschnitts drückt.In the device according to the invention, a stamp protrudes into the closing die in the longitudinal direction of the drill semi-finished product or the rod, wherein this stamp is adjustable such that it has a distance from the end face of the connecting section at the beginning of the embossing process which is smaller than the elongation caused by the embossing of the connecting portion or as a spring-loaded punch presses on the end face of the connecting portion.

Bei einer noch weiteren bevorzugten Ausführungsform werden die Umformkörper der Schließmatrize durch konisch, keilförmig oder nockenförmig ausgebildete Betätigungsglieder radial bewegt.In a still further preferred embodiment, the forming bodies of the closing die are moved radially by conical, wedge-shaped or cam-shaped actuating members.

Bevorzugte Ausführungsformen der Erfindung werden beispielhaft anhand der beiliegenden Figuren beschrieben. Es zeigen:

Figuren 1 bis 3
Zwischenprodukte eines erfindungsgemäßen Verbindungsabschnitts, der nach einem Ausführungsbeispiel des erfindungsgemäßen Verfahrens gefertigt wird,
Fig. 4
eine Detailansicht des in Fig. 2 gezeigten Verbindungsabschnitts,
Fig. 5
eine Draufsicht des in den Figuren 2 und 4 gezeigten Verbindungsabschnitts,
Fig. 6
eine Schnittansicht der in Fig. 5 gezeigten Schnittlinie C-C,
Fig. 7
eine Schnittansicht der in Fig. 5 gezeigten Schnittlinie B-B,
Fig. 8
eine Detailansicht des in Fig. 3 gezeigten Verbindungsabschnitts,
Fig. 9
eine Draufsicht des in den Figuren 3 und 8 gezeigten Verbindungsabschnitts,
Fig. 10
eine Schnittansicht der in Fig. 9 gezeigten Schnittlinie B-B,
Fig. 11
eine Schnittansicht der in Fig. 9 gezeigten Schnittlinie C-C,
Fig. 12
ein erstes Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung in einer Schnittansicht und
Fig. 13
ein zweites Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung in einer Schnittansicht.
Preferred embodiments of the invention will be described by way of example with reference to the accompanying figures. Show it:
FIGS. 1 to 3
Intermediates of a connecting portion according to the invention, which is manufactured according to an embodiment of the method according to the invention,
Fig. 4
a detailed view of the in Fig. 2 shown connection section,
Fig. 5
a top view of the in the FIGS. 2 and 4 shown connection section,
Fig. 6
a sectional view of in Fig. 5 shown section line CC,
Fig. 7
a sectional view of in Fig. 5 shown section line BB,
Fig. 8
a detailed view of the in Fig. 3 shown connection section,
Fig. 9
a top view of the in the Figures 3 and 8th shown connection section,
Fig. 10
a sectional view of in Fig. 9 shown section line BB,
Fig. 11
a sectional view of in Fig. 9 shown section line CC,
Fig. 12
a first embodiment of a device according to the invention in a sectional view and
Fig. 13
A second embodiment of a device according to the invention in a sectional view.

Fig. 1 zeigt ein Zwischenprodukt eines Verbindungsabschnitts 100, der nach einem Ausführungsbeispiel des erfindungsgemäßen Verfahrens gefertigt wird. Der Verbindungsabschnitt 100 bildet einen Teil eines Bohrerhalbzeugs 102 mit einer zylinderförmigen Umfangsoberfläche 104. Zudem weist der Verbindungsabschnitt 100 eine Endfläche 106 auf. Fig. 1 zeigt den erfindungsgemäß gefertigten Verbindungsabschnitt 100 in einem Rohzustand 110 vor dem Einprägen von Längsnuten. Gemäß dem in Fig. 1 gezeigten Ausführungsbeispiel wird in einem Verfahrensschritt a) des erfindungsgemäßen Verfahrens zur Herstellung eines mit einer Endfläche 106 versehenen Verbindungsabschnitts 100 der Rohzustand 110 in Form des Bohrerhalbzeugs 102 bereitgestellt. Fig. 1 shows an intermediate product of a connecting portion 100, which is manufactured according to an embodiment of the method according to the invention. The connecting portion 100 forms a part of a drill semi-finished product 102 having a cylindrical circumferential surface 104. In addition, the connecting portion 100 has an end surface 106. Fig. 1 shows the inventively manufactured connecting portion 100 in a raw state 110 before the stamping of longitudinal grooves. According to the in Fig. 1 shown Exemplary embodiment, in a method step a) of the method according to the invention for producing a connection section 100 provided with an end face 106, the raw state 110 in the form of the drill semi-finished product 102 is provided.

Die Figuren 2 und 4-7 zeigen den in Fig. 1 gezeigten Verbindungsabschnitt 100 als Zwischenprodukt 120, nachdem in einem Verfahrensschritt b) der Verbindungsabschnitt 100 in eine Schließmatrize 128, wie sie in den Figuren 12 und 13 gezeigt ist, eingeführt wurde und nachdem in einem Verfahrensschritt c) eine Längsnut 122 eingeprägt wurde. Das Einprägen erfolgt dabei ohne Vorformen der Längsnut 122 in dem Bohrerhalbzeug 102. Die eingeprägte Längsnut 122 ist zur Endfläche 106 des Verbindungsabschnitts 100 hin geschlossen und bildet eine Verriegelungsnut 124.The Figures 2 and 4-7 show the in Fig. 1 shown connecting portion 100 as an intermediate product 120, after in a process step b) the connecting portion 100 in a closing die 128, as shown in the Figures 12 and 13 is shown, and after in a process step c) a longitudinal groove 122 has been impressed. The embossing takes place without preforming the longitudinal groove 122 in the drill semi-finished product 102. The embossed longitudinal groove 122 is closed to the end face 106 of the connecting portion 100 and forms a locking groove 124th

Die Figuren 3 und 8-11 zeigen den in den Figuren 1, 2 und 4-7 gezeigten Verbindungsabschnitt 100 als Zwischenprodukt 160, nachdem in einem weiteren Verfahrensschritt eine Längsnut 162 eingeprägt wurde. Die eingeprägte Längsnut 162 ist zur Endfläche 106 des Verbindungsabschnitts 100 hin offen und bildet eine Drehmitnahmenut 164.The Figures 3 and 8-11 show the in the FIGS. 1 . 2 and 4-7 shown connecting portion 100 as an intermediate product 160, after in a further process step, a longitudinal groove 162 has been impressed. The embossed longitudinal groove 162 is open toward the end face 106 of the connection section 100 and forms a rotational drive groove 164.

Das Einprägen gemäß Verfahrensschritt c) kann mittels einer Vorrichtung 126, wie sie in Fig. 12 in einem ersten Ausführungsbeispiel gezeigt ist, oder mittels einer Vorrichtung 226, wie sie in Figur 13 in einem zweiten Ausführungsbeispiels gezeigt ist, erfolgen. Die Figur 12 bzw. 13 zeigt die Vorrichtung 126 bzw. 226 in einem ersten Zustand C1 vor dem Einprägen und einem zweiten Zustand C2 während des oder nach dem Einprägen.The impressing according to method step c) can be achieved by means of a device 126, as shown in FIG Fig. 12 in a first embodiment, or by means of a device 226 as shown in FIG FIG. 13 is shown in a second embodiment, take place. The FIG. 12 13 shows the device 126 or 226 in a first state C1 before the impressing and a second state C2 during or after the impressing.

Fig. 12 zeigt die Vorrichtung 126 in einer Schnittansicht in den zwei Zuständen C1 und C2, in Betrachtungsrichtung oben vor dem Einprägen und unten während oder nach dem Einprägen. Die Vorrichtung 126 umfasst eine Schließmatrize 128, welche Aussparungen 130 aufweist. In den Aussparungen 130 sind, in einer Radialrichtung 132 beweglich, Umformkörper 134 angeordnet. Wenn diese Umformkörper 134 radial nach innen zugestellt werden, werden Verriegelungsnuten 124 in dem Verbindungsabschnitt 100 geformt. Bei dem Einprägen gemäß Verfahrensschritt c), wie es in Fig. 12 gezeigt ist, wird eine Längung des Verbindungsabschnitts 100 in einer Längsrichtung 136 bewirkt. Durch die Längung stößt die Endfläche 106 gegen einen Stempel 138, welcher vor dem Prägen einen Abstand abhängig von der Längung des Verbindungsabschnitts 100 durch das Einprägen zur Endfläche 106 aufweist. Fig. 12 FIG. 12 shows the device 126 in a sectional view in the two states C1 and C2, in the viewing direction above before the impressing and below during or after the stamping. The device 126 comprises a closing die 128, which has recesses 130. In the recesses 130, movable in a radial direction 132, Umformkörper 134 are arranged. When these forming bodies 134 are delivered radially inward, locking grooves 124 are formed in the connecting portion 100. In the impressing according to method step c), as in Fig. 12 is shown, elongation of the connecting portion 100 in a longitudinal direction 136 is effected. By the elongation, the end surface 106 abuts against a punch 138, which before embossing has a distance depending on the elongation of the connecting portion 100 by the embossing to the end surface 106.

Mittels Betätigungsgliedern 140, welche eine nach innen gerichtete konische Fläche 142 aufweisen, werden die Umformkörper 134 radial zugestellt, wenn die Betätigungsglieder 140 sich in Längsrichtung 136 bewegen.By means of actuators 140, which have an inwardly directed conical surface 142, the Umformkörper 134 are delivered radially when the actuators 140 move in the longitudinal direction 136.

Fig. 13 zeigt die Vorrichtung 226 als zweites Ausführungsbeispiel. Die Vorrichtung 226 ist ähnlich zu der in Fig. 12 gezeigten Vorrichtung 126 aufgebaut. Gleiche und funktionsgleiche Elemente sind dabei mit denselben Bezugszeichen versehen. Um Unterschied zu der in Fig. 12 gezeigten Vorrichtung weist die Vorrichtung 226 einen Stempel 238 auf, welcher mittels einer Feder 250, in Längsrichtung 136 federnd gelagert ist. Fig. 13 shows the device 226 as a second embodiment. The device 226 is similar to that in FIG Fig. 12 constructed device 126 constructed. The same and functionally identical elements are provided with the same reference numerals. In difference to the in Fig. 12 As shown, the device 226 has a punch 238, which is spring-mounted by means of a spring 250 in the longitudinal direction 136.

Bezugszeichenreference numeral

100100
Verbindungsabschnittconnecting portion
102102
BohrerhalbzeugDrill semis
104104
Umfangsoberflächecircumferential surface
106106
Endflächeend face
110110
Rohzustandrawness
120120
Zwischenproduktintermediate
122122
Längsnutlongitudinal groove
124124
Verriegelungsnutlocking
126126
Vorrichtungcontraption
128128
SchließmatrizeSchließmatrize
130130
Aussparungenrecesses
132132
Radialrichtungradial direction
134134
Umformkörperconverting body
136136
Längsrichtunglongitudinal direction
138138
Stempelstamp
140140
Betätigungsgliederactuators
160160
Zwischenproduktintermediate
162162
Längsnutlongitudinal groove
164164
Drehmitnahmenutdrive groove
226226
Vorrichtungcontraption
238238
Stempelstamp
250250
Federfeather

Claims (11)

  1. Method for producing a connecting section (100), provided with an end face, as part of a tool, in particular of a bit or a chisel which can be fastened in an axially mobile fashion in the tool holder of a hammer drill, or as part of a connecting rod,
    - wherein the connecting section (100) comprises at least one longitudinal groove (122), at least one of which is at least partially closed towards the end face (106) of the connecting section,
    - characterised by the method steps
    a) providing a semi-finished bit (102) or a rod having an essentially cylindrical or polygonal, in particular square, circumferential surface (104),
    b) inserting the connecting section (100) into a closable die (128),
    c) impressing the at least one longitudinal groove (122) by radial movement of one or more shaping bodies (134) which can be moved in the closable die (128), so that elongation of the connecting section (100) and, in the region of the longitudinal groove (122), a cross-sectional area reduction are induced,
    - characterised in that a stamp (138), which at the start of the impressing process has a distance from the end face (106) of the connecting section (100) that is less than the elongation of the connecting section (100) induced by the impressing, or a sprung stamp (238) presses on the end face (106), so that the elongation of the connecting section (100) is limited.
  2. Method according to Claim 1, wherein the impressing is carried out without preforming of the longitudinal groove (122), in particular without preforming of the longitudinal groove (122) in the semi-finished bit (102) or the rod.
  3. Method according to any one of the preceding claims, wherein during step c), at least one driver groove (164) or driver surface, which is open towards the end face (106) of the connecting section (100), is additionally produced by impressing by means of radial movement of shaping bodies which can be moved in the closable die (128).
  4. Method according to either one of Claims 1-2, wherein before step c), at least one driver groove (164) or driver surface, which is open towards the end face (106) of the connecting section (100), is additionally produced in a preceding shaping step by narrowing, extrusion or other shaping methods, or wherein after step c), is produced in a subsequent shaping step by narrowing, extrusion or other shaping methods, while the groove produced first is filled by corresponding shaping of the die or by fillers.
  5. Method according to any one of Claims 1-2 and 4, wherein the closable die (128) has an, in particular inwardly directed, contour facing towards the connecting section (100), which is configured according to the outer contour, existing before step c), of the connecting section, and wherein the grooves or surfaces which are open towards the end face (106) of the connecting section (100) are filled by corresponding shaping of the die or by fillers.
  6. Method according to any one of the preceding claims, wherein the impressing in step c) or the shaping of the further grooves (126) is carried out in two or more shaping sub-steps.
  7. Method according to any one of the preceding claims, wherein the shaping bodies (134) in step c) have shapings in their edge regions, in particular chamfers, which limit the material flow during the impressing.
  8. Device for manufacturing a connecting section (100) as part of a tool, in particular of a bit or a chisel which can be fastened in an axially mobile fashion in the tool holder of a hammer drill, the connecting section (100) having an end face (106) and an essentially cylindrical or polygonal, in particular square, circumferential surface (104), or as part of a rod, comprise:
    a closable die (128) having at least one at least radially movable shaping body (134), which are arranged in the recesses of the closable die (128) and by means of which at least one locking groove (128) can be formed by impressing,
    characterised in that a stamp (138; 238) projects into the closable die (128) in the longitudinal direction (136) of the semi-finished bit (102) or the rod, and wherein
    this stamp (138) can be adjusted in such a way that, at the start of the impressing process, it has a distance from the end face (106) of the connecting section (100) that is less than the elongation of the connecting section (100) induced by the impressing, or presses as a sprung stamp (238) on the end face (106) of the connecting section (100) is limited.
  9. Device according to Claim 8, comprising:
    a closable die (128), by means of which locking grooves (124) and longitudinal grooves (162) for longitudinal surfaces, which are open towards the end face (106) can be formed by impressing with at least radially mobile shaping bodies (134) arranged in recesses of the closable die (128).
  10. Device according to Claim 8, comprising:
    - a die, by means of which at least one longitudinal groove or longitudinal surface can be formed in the circumferential surface (104) by extrusion or narrowing, and
    - a closable die (128) which has at least radially mobile shaping bodies (134) and by means of which at least one locking groove (124) can be formed by impressing.
  11. Device according to any one of Claims 8 to 10,
    wherein the shaping bodies (134) of the closable die (128) are moved radially by conically shaped or wedge-shaped actuation elements (140).
EP14161805.8A 2013-06-25 2014-03-26 Method and device for manufacturing a connection section with an end section as part of a tool Active EP2839900B1 (en)

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DE102018126093A1 (en) 2018-10-19 2020-04-23 Mac Panther Gmbh Method and device for producing a connecting element
DE102020007945A1 (en) 2020-12-24 2022-06-30 Mac Panther Gmbh Connection section with locking groove open on one side

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DE102013010495A1 (en) 2015-01-08
CN104249129B (en) 2018-07-20
CN104249129A (en) 2014-12-31
EP2839900A1 (en) 2015-02-25

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