EP2839900B1 - Procédé et dispositif de fabrication d'une section de raccordement pourvue d'une face terminale comme élément d'un outil - Google Patents

Procédé et dispositif de fabrication d'une section de raccordement pourvue d'une face terminale comme élément d'un outil 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
Authority
EP
European Patent Office
Prior art keywords
connecting section
impressing
face
shaping
die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14161805.8A
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German (de)
English (en)
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EP2839900A1 (fr
Inventor
Michael Kleine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mac Panther GmbH
Original Assignee
Mac Panther GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mac Panther GmbH filed Critical Mac Panther GmbH
Publication of EP2839900A1 publication Critical patent/EP2839900A1/fr
Application granted granted Critical
Publication of EP2839900B1 publication Critical patent/EP2839900B1/fr
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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)

Claims (11)

  1. Procédé servant à fabriquer une section de raccordement (100) pourvue d'une face d'extrémité en tant que partie d'un outil, en particulier d'un foret ou d'un trépan pouvant être fixé de manière mobile axialement dans le porte-outil d'un marteau perforateur ou
    en tant que partie d'une tige de raccordement,
    - dans lequel la section de raccordement (100) présente au moins une rainure longitudinale (122), dont au moins une est fermée au moins en partie en direction de la face d'extrémité (106) de la section de raccordement,
    - caractérisé par les étapes de procédé consistant à :
    a) mettre à disposition un produit semi-fini de foret (102) ou une tige comprenant une surface périphérique (104) sensiblement de forme cylindrique ou de forme polygonale, en particulier carrée ;
    b) introduire la section de raccordement (100) dans une matrice de fermeture (128) ;
    c) estamper l'au moins une rainure longitudinale (122) par un rapprochement radial d'un ou de plusieurs corps de mise en forme (134) mobiles dans la matrice de fermeture (128), ce qui permet de provoquer un allongement de la section de raccordement (100) et, dans la zone de la rainure longitudinale (122), une réduction de la face de section transversale,
    - caractérisé en ce qu'un poinçon (138), qui a, au début de l'opération d'estampage, une distance par rapport à la face d'extrémité (106) de la section de raccordement (100) qui est inférieure à l'allongement de la section de raccordement (100) provoqué par l'estampage, ou en ce qu'un poinçon (238) sur ressorts exerce une pression sur la face d'extrémité (106), ce qui permet de limiter l'allongement de la section de raccordement (100).
  2. Procédé selon la revendication 1, dans lequel l'estampage est effectué sans façonnage préalable de la rainure longitudinale (122), en particulier sans façonnage préalable de la rainure longitudinale (122) dans le produit semi-fini de forage (102) ou dans la tige.
  3. Procédé selon l'une quelconque des revendications précédentes, dans lequel, au cours de l'étape c), en supplément, au moins une rainure d'entraînement (164) ou une face d'entraînement ouverte en direction de la face d'extrémité (106) de la section de raccordement (100) est produite par un rapprochement radial de corps de mise en forme mobiles dans la matrice de fermeture (128) au moyen de l'estampage.
  4. Procédé selon l'une quelconque des revendications 1 - 2, dans lequel, avant l'étape c), en supplément, au moins une autre rainure d'entraînement (164) ou face d'entraînement ouverte en direction de la face d'extrémité (106) de la section de raccordement (100) est produite lors d'une étape de mise en forme en amont par rétrécissement, par pressage par fluage ou par d'autres méthodes de mise en forme, ou dans lequel, après l'étape c), au moins une rainure d'entraînement (164) ou une face d'entraînement ouverte en direction de la face d'extrémité (106) de la section de raccordement (100) est produite, lors d'une étape de mise en forme en aval, par rétrécissement, par estampage ou par d'autres méthodes de mise en forme et, dans ce cadre, la rainure produite en premier lieu est remplie par une déformation correspondante de la matrice ou par des corps de remplissage.
  5. Procédé selon la revendication 1 - 2 et 4, dans lequel la matrice de fermeture (128) présente un contour tourné vers la section de raccordement (100), en particulier dirigé vers l'intérieur, lequel est réalisé de manière à correspondre au contour extérieur, présent avant l'étape c), de la section de raccordement (100) et dans lequel les rainures ou surfaces ouvertes en direction de la face d'extrémité (106) de la section de raccordement (100) sont remplies par une déformation correspondante de la matrice ou par des corps de remplissage.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'estampage à l'étape c) ou la mise en forme des autres rainures (162) sont effectués en deux étapes de façonnage partiel ou plus.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel les corps de mise en forme (134) présentent, à l'étape c), au niveau de leurs zones de bord, des déformations, de manière préférée des chanfreins, qui délimitent le flux de matériau lors de l'estampage.
  8. Dispositif servant à confectionner une section de raccordement (100) en tant que partie d'un outil, en particulier d'un foret ou d'un trépan fixé de manière mobile axialement dans le porte-outil d'un marteau perforateur, dans lequel la section de raccordement (100) présente une face d'extrémité (106) et une surface périphérique (104) sensiblement de forme cylindrique ou de forme polygonale, en particulier carrée, ou en tant que partie d'une tige, comprenant
    une matrice de fermeture (128) pourvue au moins d'un corps de mise en forme (134) au moins mobile radialement et disposé dans des évidements de la matrice de fermeture (128), au moyen duquel au moins une rainure de verrouillage (124) peut être façonnée par estampage,
    caractérisé en ce qu'un poinçon (138 ; 238) dépasse dans la matrice de fermeture (128) dans la direction longitudinale (136) du produit semi-fini de forage (102) ou de la tige et dans lequel
    ledit poinçon (138) peut être réglé de telle manière qu'il a, au début de l'opération d'estampage, une distance par rapport à la face d'extrémité (106) de la section de raccordement (100) qui est inférieure à l'allongement, provoqué par l'estampage, de la section de raccordement (100), ou qu'il exerce une pression sur la face d'extrémité (106) de la section de raccordement (100) en tant que poinçon (238) sur ressorts.
  9. Dispositif selon la revendication 8, comprenant :
    une matrice de fermeture (128), au moyen de laquelle des rainures de verrouillage (124) et des rainures longitudinales (162) ou des faces longitudinales ouvertes en direction de la face d'extrémité (106) peuvent être façonnées par des corps de mise en forme (134) au moins radialement mobiles et disposés dans des évidements de la matrice de fermeture (128) .
  10. Dispositif selon la revendication 8, comprenant :
    - une matrice, au moyen de laquelle au moins une rainure longitudinale ou une face longitudinale peut être façonnée dans la surface périphérique (104) par pressage par fluage ou par rétrécissement, et
    - une matrice de fermeture (128) pourvue de corps de mise en forme (134) au moins radialement mobiles, au moyen de laquelle au moins une rainure de verrouillage (124) peut être façonnée par estampage.
  11. Dispositif selon l'une quelconque des revendications 8 à 10,
    dans lequel les corps de mise en forme (134) de la matrice de fermeture (128) sont déplacés radialement par des organes d'actionnement (140) réalisés de manière conique ou de manière à présenter une forme de coin.
EP14161805.8A 2013-06-25 2014-03-26 Procédé et dispositif de fabrication d'une section de raccordement pourvue d'une face terminale comme élément d'un outil Active EP2839900B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013010495.5A DE102013010495A1 (de) 2013-06-25 2013-06-25 Vefahren und Vorrichtung zur Herstellung eines mit einer Endfläche versehenen Verbindungsabschnitts als Teil eines Werkzeuges

Publications (2)

Publication Number Publication Date
EP2839900A1 EP2839900A1 (fr) 2015-02-25
EP2839900B1 true EP2839900B1 (fr) 2017-07-12

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Application Number Title Priority Date Filing Date
EP14161805.8A Active EP2839900B1 (fr) 2013-06-25 2014-03-26 Procédé et dispositif de fabrication d'une section de raccordement pourvue d'une face terminale comme élément d'un outil

Country Status (3)

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EP (1) EP2839900B1 (fr)
CN (1) CN104249129B (fr)
DE (1) DE102013010495A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018126093A1 (de) 2018-10-19 2020-04-23 Mac Panther Gmbh Verfahren und Vorrichtung zur Herstellung eines Verbindungselementes
DE102018126086B4 (de) 2018-10-19 2023-10-12 Mac Panther Gmbh Verbindungselement, Verfahren und Vorrichtung zu seiner Herstellung
DE102020007945A1 (de) 2020-12-24 2022-06-30 Mac Panther Gmbh Verbindungsabschnitt mit einseitig offener Verriegelungsnut

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DE8433275U1 (de) 1984-11-14 1986-03-27 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug
DE19604279B4 (de) * 1996-02-07 2005-04-28 Bosch Gmbh Robert Einsatzwerkzeuge für Bohrhämmer und Verfahren zu seiner Herstellung
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JP4879878B2 (ja) * 2005-01-31 2012-02-22 昭和電工株式会社 据え込み加工方法及び据え込み加工装置
DE102008055637A1 (de) 2008-11-03 2010-05-06 Südsta AG Stange und Verfahren zu ihrer Herstellung
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DE102010018791A1 (de) * 2010-04-29 2011-11-03 Illinois Tool Works Inc. Verfahren zur Herstellung eines länglichen Werkzeugs mit einem Arbeitsabschnitt und einem Einsteckabschnitt
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Also Published As

Publication number Publication date
DE102013010495A1 (de) 2015-01-08
CN104249129B (zh) 2018-07-20
CN104249129A (zh) 2014-12-31
EP2839900A1 (fr) 2015-02-25

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