WO2011113556A1 - Procédé et appareillage pour la production sans enlèvement de copeaux d'éléments d'assemblage, de fixation ou de fermeture en métal comportant un filetage extérieur - Google Patents

Procédé et appareillage pour la production sans enlèvement de copeaux d'éléments d'assemblage, de fixation ou de fermeture en métal comportant un filetage extérieur Download PDF

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Publication number
WO2011113556A1
WO2011113556A1 PCT/EP2011/001225 EP2011001225W WO2011113556A1 WO 2011113556 A1 WO2011113556 A1 WO 2011113556A1 EP 2011001225 W EP2011001225 W EP 2011001225W WO 2011113556 A1 WO2011113556 A1 WO 2011113556A1
Authority
WO
WIPO (PCT)
Prior art keywords
blank
tool
external thread
thread
punch
Prior art date
Application number
PCT/EP2011/001225
Other languages
German (de)
English (en)
Inventor
Hilmar Gensert
Original Assignee
Sieber Forming Solutions 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 Sieber Forming Solutions Gmbh filed Critical Sieber Forming Solutions Gmbh
Publication of WO2011113556A1 publication Critical patent/WO2011113556A1/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
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements
    • 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
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/022—Special design or construction multi-stage forging presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/06—Swaging presses; Upsetting presses

Definitions

  • the invention relates to methods for chipless production of connection, fastening or closure elements made of metal with external thread, for use as hollow screws, hollow shafts, threaded sleeves, as well as a device suitable for carrying out the method.
  • the thread can also be produced by means of lathes clamped in lathes, wherein the workpiece is driven.
  • the rolling or rolling of external threads on hollow cylindrical workpieces made of metal has gained in mass production in practice the greatest importance.
  • a prerequisite for this is that the hollow cylindrical workpieces have a sufficient wall thickness.
  • the wall thickness should be at least about 1/5 of the outer diameter / wall thickness on thread rolling on two-roll rolling machines and about 1/8 of the outer diameter / wall thickness on three-roll rolling machines.
  • the thread can only be produced by machining or by means of rolling heads on lathes. Producing the thread on multi-spindle turning or tapping machines, however, is more material and time consuming than in a forming production.
  • the invention has for its object to provide a method for chipless production of connection, fastening or closure elements made of metal with external thread, which is characterized by a simpler procedure and improved efficiency. Furthermore, a device suitable for carrying out the method is to be provided.
  • the starting material consisting of a solid blank of wire or rod material.
  • the blank is placed in an open or closed multi-part jaw tool with a mold cavity, the inner wall is provided with a trained as a negative thread profiling.
  • the protruding edges of the thread profiling touch at most the lateral surface of the blank or there is a slight play between them.
  • the shape of the blank is not changed.
  • At least one tool or first punch engages as a counter-holder on one of the two end faces of the blank in order to prevent the blank from being displaced in the axial direction during the subsequent cold-forming process.
  • To create an external thread on the blank two possibilities are provided.
  • the contours of the thread profiling are filled by a predominantly radial flow of material (Querf beaupressen) and thus generates the external thread.
  • an axial recess as a blind hole.
  • the jaw tool After completion of the cup, the jaw tool is opened and the finished connection or fastener removed therefrom.
  • the shaping forces for producing the external thread are exclusively determined by the cupping process. introduced.
  • the jaw tool must remain closed during the cupping process and must not open.
  • the blank inserted in the jaw tool does not project beyond the end face on which the cup tool engages.
  • the counter-attacking punch on the opposite side is preferably guided in a sleeve which acts as a flow brake to suppress backward flow of material during cupping.
  • the end product or the finished screw is not hollow in the axial direction, but has only a hollow portion or a blind hole in the region of the male threaded portion. At the hollow portion or the blind hole is followed by a section of solid material.
  • a collar of solid material in the middle section and two opposite threaded sections, which can also be produced according to the method of the invention.
  • the axial recess blind hole
  • the axial recess blind hole
  • the blank may have different initial shapes. At the cup side, this can be an already preformed recess, e.g. in the form of a dome, own. Alternatively, the blank may be tapered in one direction.
  • Another variant, which can be used in particular for small-volume parts, is that accumulated during the cup excess material is forced into a secondary cavity.
  • the Maukavtician can be arranged for example in the baking tool or in the counter tool.
  • the material plug formed in the secondary cavity can either be removed or remain in the secondary cavity, for example as an integral part of the molded part.
  • the advantage of the first embodiment is a simultaneous creation of an external thread and a blind hole in the region of the threaded portion in one operation, without the risk that the cross-sectional shape may change, as is the case when rolling threads on thin-walled hollow parts.
  • the blank inserted in the jaw tool projects beyond the end face of the thread profiling of the jaw tool, on which the tool engages to produce the external thread.
  • the tool for generating the external thread consists of a sleeve with a movable in the axial direction of the second punch.
  • the internal cross-sectional area of the sleeve corresponds to the cross-sectional area of the protruding portion of the blank. After delivery of the tool, this is inside the sleeve.
  • About the pressurized punch an extrusion process is triggered by upsetting and pressed material into the hollow or interstices of the trained as a negative thread profiling of the baking tool.
  • at least one punch or tool acts as an anvil on the opposite side of the blank.
  • the protruding portion of the blank may be as large as the void volume of the thread profiling. For the same size then closes the finished screw flush with the front of the jaw tool. If the protruding portion is larger, the remaining remainder of material can be used to form a tip. If this is smaller, the result is a depression or recess on the corresponding front side of the molded part.
  • the end products produced according to the second embodiment are made of solid material, so have no cavity or recess in the region of the male threaded portion.
  • Standard and special or special screws in particular screw plugs, oil drainage or through-bolts can be produced economically, in particular, according to the method of the invention. Also for the production of pin or grub screws with internal drives, the method is well suited.
  • a blank is used, which projects beyond the jaw tool on the head side.
  • the projecting portion Prior to the formation of the external thread, the projecting portion is made into a screw head by means of separate dies in one or more forming steps, e.g. as a hexagon, reshaped.
  • the blank is supported on the opposite side by means of a punch.
  • a drive can be generated, for example, as in a screw with hexagonal head additionally in the head still an internal drive can be formed as a hexagon.
  • the thread profiling of the negative mold can also consist of several different in their geometry threaded sections, which can be produced during the Napfvorganges threaded sections with different thread geometry.
  • Another advantage is that the radial displacement of the material threaded portion is work hardened and at the same time creates a bare surface, so that no further post-processing is required.
  • the additional work hardening allows a stronger mechanical load of the threaded portion.
  • the method according to the invention can also be used within a multi-stage press.
  • a multi-stage press With regard to the known process sequence of a multi-stage press, reference is made to EP 2 156 909 A2.
  • a suitable device for carrying out the method consists of a multi-part, movable in an open and closed position baking tool with an open on both sides cylindrical mold cavity for receiving a blank made of solid material.
  • the inner cavity of the jaws delimiting the mold cavity is equipped with a thread profiling designed as a negative. During the closing movement of the jaws, the thread profiling does not come into contact with the outer surface of the blank. The movement of the jaws does not deform the blank.
  • the limited by the inner wall of the jaws mold cavity is sized in size so that in the closed state of the jaws between the outer surface of the insertable blank and the inner wall of the mold cavity is little play or at best touch contact.
  • On one of the end faces of the baking tool engages at least a first punch or tool, which serve as an anvil.
  • a second punch or mandrel which can be moved in the axial direction is arranged as a deformation tool to produce an external thread.
  • the deformation tool can be designed as a cupping tool or as an upsetting tool, with the cup or the punch for upsetting each being guided in a die or sleeve.
  • the die is part of the baking tool and has a corresponding guide for Napfdorn or stamp.
  • the sleeves can also take over the function as an ejector for the finished part.
  • the trained as a negative thread profiling of the jaws is designed so that in the region of the edge zones of the jaws of the outer thread diameter decreases continuously to both sides, i. the profile height decreases. This significantly reduces the risk that material may get between the jaws during the thread pressing process.
  • the thread profiling of the jaws can be interrupted by other profiles or the jaws are equipped with other profiles outside the thread profiling.
  • FIG. 1 shows a preformed blank for producing a hollow male screw with external thread, in an enlarged view, as a longitudinal section
  • FIG. 3 shows the jaw tool according to FIG. 2 during the cupping process
  • FIG. 4 shows the jaw tool according to FIG. 2 in the opened state
  • Fig. 5 is a section along the line A-A in Fig. 3, in an enlarged view, without
  • Fig. 9 shows a second embodiment of the baking tool as a cross-sectional view
  • FIG. 10 shows the process steps for the inventive production of a solid head screw in a simplified schematic representation.
  • the blank 1 shown in Figure 1 of solid material for producing a hollow grub screw with external thread has in the upper section 2 in the middle of a preformed drive 3 as a hexagon socket. On the lower portion 4 an external thread is to be generated, the majority of this section is to be formed hollow.
  • the middle portion 5 is formed tapered compared to the other two sections 2 and 4.
  • the preformed blank 1 is placed in an open or closed jaw tool 6 with three movable jaws 7, 8 and 9 ( Figure 5), as shown in FIG.
  • the jaws 7, 8 and 9 In the closed state of the jaws 7, 8 and 9 there is a small clearance of a few tenths of a millimeter between their inner sides and the outer surface of the blank 1.
  • the jaws 7, 8 and 9 have on their inner side or inner wall a Gewindepro- filing 10 as a negative.
  • the inner wall of the jaws defines the mold cavity 11 (FIG. 5).
  • the blank 1 When producing headless screws, the blank 1 should not project beyond the jaws of the jaw tool 6.
  • the jaw tool 6 consists of an outer, displaceable in the axial direction ring 12, in which the three jaws 7, 8 and 9 are mounted radially movable.
  • the outer surfaces of the jaws 7, 8 and 9 have a conical outer surface 13 and the outer ring 12 has a corresponding tapered inner surface 14, such that the jaws 7, 8 and 9 are movable within the outer ring 12 into an open and closed position ,
  • the required drive units for moving the jaws are not shown in detail in the drawing, since these are known systems.
  • the opening and closing movement of the jaws 7, 8 and 9 is realized via a spring assembly not shown in detail. With the feed motion on the drive unit, the spring assembly is stretched, the ring 12 is moved with the jaws 7, 8 and 9 against a stop. When moving in the opposite direction, the spring assembly is relaxed while the ring 12 moves upward, with the jaws open.
  • the device also includes a Napfdorn 15 which is guided axially movable in a sleeve 16 and opposite a first punch 17, which is also guided in a sleeve 18.
  • the punch 17 is acted upon by a defined counterpressure in order to prevent the blank 1 from being moved in the axial direction during the cupping process.
  • the punch 17 therefore acts like a counter-holder.
  • the end section 19 of the punch 16 pointing in the direction of the blank 1 has the shape of a hexagon, which fits exactly in the drive opening 3 of the blank 1.
  • the two sleeves 16 and 18, on their pointing in the direction of the blank end face have a planar annular surface, have several functions. On the one hand, they serve during the opening movement of the baking tool 6 as a scraper or ejector for the finished molded part 20.
  • the two sleeves 16, 18 in cooperation with the cup mandrel 15 and the punch 17 during the molding a closure for the two opposite openings of the mold cavity 11 of the jaw tool 6.
  • the arranged on the cup side, spring-loaded sleeve 16, which is held during the molding in a stable, unchangeable position to prevent the blank 1 during the cup expands in the longitudinal direction or material in the axial direction to the outside is pressed. It acts as a flow brake or lock.
  • the arranged on the opposite side sleeve 18 serves to guide the punch. 7
  • a defined pressure force is exerted on the cup mandrel 15 in the axial direction, whereby the tapered front end of the cup mandrel 15 penetrates into the blank 1.
  • the directions of movement of the Napfdornes 15 are indicated by arrows.
  • About the movement of the Napfdornes 15 material of the blank 1 is pressed outwardly into the cavities of the formed as a negative thread profiling 10 by an extrusion process.
  • a cavity in the form of a blind hole 22 (FIG. 6) is produced by the cupping process in the region of the threaded section.
  • the Napfdorn can consist of high-speed steel or carbide.
  • FIG. 6 shows two further embodiments a and b of blanks.
  • the blank 23 according to the embodiment b has at one of its two end faces a dome-shaped recess 24. This is located on the Napfseite. This prevents too much excess material from seeping in the external thread. This can be an advantage, especially for blanks with larger outside diameters.
  • the portion of the blank 25 on which the thread is to be formed may be tapered in one direction, as seen in Figure a.
  • the taper 26 should be dimensioned so that the blank 25 can still be sufficiently fixed in the jaw tool 6.
  • the process steps I, II and III for producing a hollow head screw (standard screw), starting from a cylindrical blank 27, are shown.
  • the jaw tool 6 is designed so that the section 28 of the blank 27 intended for forming the head projects beyond the latter after insertion into the jaw tool 6.
  • the bowl side 29 of the blank 27 terminates flush with the underside of the baking tool 6.
  • first stationary counter punch 30 by which the inserted blank 27 is fixed in its position during the process steps I and II.
  • a first punch tool 32 is delivered, consisting of a sleeve-shaped die 33 and guided in this, pressurizable punch 34, wherein the movement of the punch 34 toward Napfseite 29, the upper portion 28 of the blank 27 is preformed by upsetting.
  • the first punch tool 32 is moved back and delivered a second punch tool 35.
  • This also consists of a sleeve-shaped die 36 and a punch 37.
  • the two punch tools 32 and 35 differ in their shaping contour.
  • the final shape is produced as a hexagonal screw head 40 by the movement of the punch 37 in the direction Napfseite 29.
  • the counter punch 30 is moved away and a cup tool 38 is delivered.
  • process stage III cupping and thread forming
  • the second punch tool 35 remains in its position and assumes the function of a counter-holder during the cupping process.
  • the Napfwerkmaschine 38 consists of Napfdorn 15 and sleeve 16, as already described above with reference to Figures 2 to 4. After completion of the cup with simultaneous displacement of material into the cavity of the thread profiling 10 and generation of the external thread 21 and a blind hole 22, the second punch tool 35 is moved away. Subsequently, the jaw tool 6 is opened and the finished screw 39 is ejected by means of the ejector sleeve 16.
  • FIG. 9 also shows a second variant of a jaw tool 6, which differs from the embodiment according to FIGS. 2 to 5 only in that the thread profiling 10 of the individual jaws 7, 8, 9 formed as a negative is designed in such a way that the profile height or thread depth 41 of the individual threads in each case in the direction of the closing gap or edge 48 of the jaws 7, 8, 9 is reduced. Immediately rich of the closing edges 48 of the jaws is then no thread profiling as a negative more available. This considerably reduces the risk that material may enter the closing gap as a result of the extrusion process.
  • FIG. 10 shows the process stages I, II and III for producing a complete head screw (standard screw) starting from a cylindrical blank 42.
  • the blank 42 has an upper section 28 intended for forming the head and a lower upsetting section 43.
  • the formation of the screw head takes place in an analogous manner as already described in the first embodiment according to FIG.
  • the upset portion 43 projects beyond the lower side of the jaw tool 6.
  • the counter-punch 30 abutting on this side has at its upper portion a corresponding recess for receiving the upset portion 43.
  • the counter punch 30 moved away and delivered a compression tool 44.
  • the compression tool consists of a sleeve-shaped die 46 and an axially movable punch 45 guided in the latter.
  • the sleeve 46 resting against the adjacent tool side encloses the projecting upset portion 43 of the blank 42, which can not be seen in FIG.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

L'invention porte sur un procédé pour la fabrication sans enlèvement de copeaux d'éléments d'assemblage, de fixation ou de fermeture en métal comportant un filetage extérieur, destinés à être utilisés comme vis creuses, arbres creux, douilles filetées, ainsi que sur un appareillage approprié pour la mise en œuvre du procédé. En se basant sur les inconvénients de l'état connu de la technique, l'invention vise à créer un procédé qui soit plus simple à mettre en œuvre et qui se caractérise par une meilleure économie. La solution selon l'invention consiste en ce qu'une ébauche 27 est introduite dans un outil à mâchoires 6 en plusieurs pièces, présentant une empreinte dont la paroi intérieure présente un profil de filetage 10 formé en négatif. Dans l'état fermé de l'outil à mâchoires 6, au moins un premier poinçon ou outil 35 attaque l'un des deux côtés latéraux de l'ébauche 27 en formant un contre-outil. Sur le côté latéral opposé 29, de la matière est enfoncée par refoulement et/ou formage par fluage, au moyen d'un deuxième poinçon ou dôme 15 mobile dans une direction axiale, dans les cavités ou espaces intermédiaires du profil de filetage 10 formé en négatif de l'outil à mâchoires 6, pour produire le filetage extérieur. Après la fin de l'opération de formage par fluage, l'outil à mâchoires 6 est ouvert et l'élément d'assemblage ou de fixation 39 fini en est extrait.
PCT/EP2011/001225 2010-03-17 2011-03-12 Procédé et appareillage pour la production sans enlèvement de copeaux d'éléments d'assemblage, de fixation ou de fermeture en métal comportant un filetage extérieur WO2011113556A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010011711 DE102010011711B4 (de) 2010-03-17 2010-03-17 Verfahren und Vorrichtung zur spanlosen Herstellung von Verbindungs-, Befestigungs- oder Verschlusselementen aus Metall mit Außengewinde
DE102010011711.0 2010-03-17

Publications (1)

Publication Number Publication Date
WO2011113556A1 true WO2011113556A1 (fr) 2011-09-22

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DE (1) DE102010011711B4 (fr)
TW (1) TW201139010A (fr)
WO (1) WO2011113556A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180185901A1 (en) * 2017-01-05 2018-07-05 Felss Systems Gmbh Method and device for thickening a plastically deformable hollow body wall of a hollow body, in particular in portions, and manufacturing method and machine for producing a hollow body

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017104205B4 (de) 2017-03-01 2018-09-27 Heinrich Hofsäß GmbH & Co. KG Verfahren zur Herstellung eines einen Schaft, an dessen einem Ende ein Kopf angeordnet ist, aufweisenden Befestigungs- oder Verbindungsmittels, insbesondere einer Schraube, einen Gewindebolzen, einem Niet, einem Nagel odgl., aus einem Rohling
DE102019002187B4 (de) * 2019-03-27 2020-10-15 Universität Stuttgart Verfahren und Vorrichtung zum Herstellen eines Bauteils mit Gewinde
EP3915695A1 (fr) 2020-05-28 2021-12-01 Hilti Aktiengesellschaft Procédé de fabrication d'une tige profilée

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581774A (en) * 1947-09-15 1952-01-08 Harry F Stone Method and apparatus for producing valve stems
JPH05169183A (ja) * 1991-12-16 1993-07-09 Obara Kinzoku Kogyo Kk 電池極柱用ブッシング鍛造装置及び鍛造ヘッダー
DE19536817A1 (de) 1995-10-02 1997-04-03 Bad Dueben Profilwalzmaschinen Profilwalzwerkzeug zum profilierenden Kaltwalzen der Mantelfläche eines Werkstückes, insbesondere eines dünnwandigen Hohlteils
EP2156909A2 (fr) 2008-08-19 2010-02-24 Sieber Forming Solutions Gmbh Procédé et dispositif de fabrication de moyens de fixation ou de liaison dotés de contours extérieurs radiaux, notamment des vis ou des boulons filetés

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE83503C (fr) *
JP2012504497A (ja) * 2008-10-03 2012-02-23 シーバー フォーミング ソリューションズ ゲーエムベーハー 中空金属被加工物上に外側ネジ山を無切削で形成するための方法および装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581774A (en) * 1947-09-15 1952-01-08 Harry F Stone Method and apparatus for producing valve stems
JPH05169183A (ja) * 1991-12-16 1993-07-09 Obara Kinzoku Kogyo Kk 電池極柱用ブッシング鍛造装置及び鍛造ヘッダー
DE19536817A1 (de) 1995-10-02 1997-04-03 Bad Dueben Profilwalzmaschinen Profilwalzwerkzeug zum profilierenden Kaltwalzen der Mantelfläche eines Werkstückes, insbesondere eines dünnwandigen Hohlteils
EP2156909A2 (fr) 2008-08-19 2010-02-24 Sieber Forming Solutions Gmbh Procédé et dispositif de fabrication de moyens de fixation ou de liaison dotés de contours extérieurs radiaux, notamment des vis ou des boulons filetés

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180185901A1 (en) * 2017-01-05 2018-07-05 Felss Systems Gmbh Method and device for thickening a plastically deformable hollow body wall of a hollow body, in particular in portions, and manufacturing method and machine for producing a hollow body
US11007564B2 (en) * 2017-01-05 2021-05-18 Felss Systems Gmbh Method and device for thickening a plastically deformable hollow body wall of a hollow body, in particular in portions, and manufacturing method and machine for producing a hollow body
US11890667B2 (en) 2017-01-05 2024-02-06 Felss Systems Gmbh Method and device for thickening a plastically deformable hollow body wall of a hollow body, in particular in portions, and manufacturing method and machine for producing a hollow body

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DE102010011711B4 (de) 2012-08-30
TW201139010A (en) 2011-11-16
DE102010011711A1 (de) 2011-09-22

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