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 PDFInfo
- 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
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- 238000000034 method Methods 0.000 title claims description 43
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000007493 shaping process Methods 0.000 claims description 18
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 4
- 238000004049 embossing Methods 0.000 description 10
- 239000011265 semifinished product Substances 0.000 description 8
- 239000000543 intermediate Substances 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- 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
- B21K5/00—Making tools or tool parts, e.g. pliers
- B21K5/02—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes
- B21K5/10—Forming drill-bit shanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/12—Forming 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
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
Aus der
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 und8 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.
- 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 and8th 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.
Die
Die
Das Einprägen gemäß Verfahrensschritt c) kann mittels einer Vorrichtung 126, wie sie in
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
- 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)
- 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 stepsa) 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.
- 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.
- 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).
- 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.
- 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.
- 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.
- 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.
- 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 whereinthis 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.
- 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).
- 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.
- 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).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013010495.5A DE102013010495A1 (en) | 2013-06-25 | 2013-06-25 | Method and device for producing an end face provided with a connecting portion as part of a tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2839900A1 EP2839900A1 (en) | 2015-02-25 |
EP2839900B1 true EP2839900B1 (en) | 2017-07-12 |
Family
ID=50349531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14161805.8A Active EP2839900B1 (en) | 2013-06-25 | 2014-03-26 | Method and device for manufacturing a connection section with an end section as part of a tool |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2839900B1 (en) |
CN (1) | CN104249129B (en) |
DE (1) | DE102013010495A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018126086B4 (en) | 2018-10-19 | 2023-10-12 | Mac Panther Gmbh | Connecting element, method and device for its production |
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 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3015893A1 (en) * | 1980-04-24 | 1981-10-29 | Hilti AG, 9494 Schaan | METHOD FOR PRODUCING TAKE-UP GROOVES ON TOOLS |
DE8433275U1 (en) | 1984-11-14 | 1986-03-27 | Hawera Probst Gmbh + Co, 7980 Ravensburg | Drilling tool |
DE19604279B4 (en) * | 1996-02-07 | 2005-04-28 | Bosch Gmbh Robert | Insert tools for rotary hammers and method for its production |
DE19915303A1 (en) | 1998-04-03 | 1999-10-14 | Hawera Probst Gmbh | Drilling tool made of semi-finished material with different diameters at different sections e.g. for use in rock drilling machine |
DE19915305C2 (en) * | 1999-04-03 | 2003-11-20 | Hawera Probst Gmbh | drilling |
EP1340573B1 (en) * | 2002-02-28 | 2006-07-12 | Robert Bosch Gmbh | Manufacturing method for a drill bit or for a milling tool |
JP4879878B2 (en) * | 2005-01-31 | 2012-02-22 | 昭和電工株式会社 | Upsetting method and upsetting apparatus |
DE102008055637A1 (en) | 2008-11-03 | 2010-05-06 | Südsta AG | Rod and method for its production |
DE102009028020B4 (en) * | 2009-07-27 | 2011-07-28 | Hilti Aktiengesellschaft | Drill and manufacturing process |
DE102010002167A1 (en) * | 2010-02-22 | 2011-08-25 | Hilti Aktiengesellschaft | Manufacturing method for an insertion end |
DE102010018791A1 (en) * | 2010-04-29 | 2011-11-03 | Illinois Tool Works Inc. | A method of manufacturing an elongate tool having a working portion and a male portion |
DE102010028474A1 (en) * | 2010-05-03 | 2011-11-03 | Hilti Aktiengesellschaft | Hollow drill and manufacturing process |
DE102010061905A1 (en) | 2010-11-24 | 2012-05-24 | Mac Panther Gmbh | Method for producing the insertion end of a drill |
DE102012204609A1 (en) | 2012-03-22 | 2013-09-26 | Mac Panther Gmbh | Method and device for producing a connection section as part of a tool |
-
2013
- 2013-06-25 DE DE102013010495.5A patent/DE102013010495A1/en not_active Withdrawn
-
2014
- 2014-03-26 EP EP14161805.8A patent/EP2839900B1/en active Active
- 2014-06-25 CN CN201410291375.8A patent/CN104249129B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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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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