WO2013113312A1 - Procédé et dispositif de fabrication d'éléments métalliques comprenant une tige déformée le long de son axe longitudinal en au moins une partie hélicoïdale - Google Patents

Procédé et dispositif de fabrication d'éléments métalliques comprenant une tige déformée le long de son axe longitudinal en au moins une partie hélicoïdale Download PDF

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Publication number
WO2013113312A1
WO2013113312A1 PCT/DE2013/100029 DE2013100029W WO2013113312A1 WO 2013113312 A1 WO2013113312 A1 WO 2013113312A1 DE 2013100029 W DE2013100029 W DE 2013100029W WO 2013113312 A1 WO2013113312 A1 WO 2013113312A1
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WO
WIPO (PCT)
Prior art keywords
blank
tool
strands
helix
mandrel
Prior art date
Application number
PCT/DE2013/100029
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 WO2013113312A1 publication Critical patent/WO2013113312A1/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
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/14—Making other products

Definitions

  • the invention relates to a method for the production of metallic components with a shaft which is deformed along its longitudinal axis to at least one helix and a device suitable for carrying out the method.
  • fastening and connection technology components made of metal, which consist of a shaft and head portion, wherein the shaft portion is usually formed as a cylindrical pin or pin, which is provided on its lateral surface with a thread.
  • screws, threaded bolts, dowels or anchors as fastening or connecting means.
  • rotatable screws made of metal, which are used as transport screws, dosing and screw conveyors, and mixing screws or worm gears. These components also have a shaft and a head section. On the lateral surface of the shaft helical or spirally extending elements are arranged. Gear worms are groove-shaped threaded structures in the form of a spiral for power transmission. The head section of these screws is used for clamping in a chuck which is connected to a rotary drive.
  • WO 2010/142458 A2 discloses a method for producing elongated metal components with helical grooves, in particular spiral drills or screws.
  • a blank is introduced without prior heating in a guide die and subsequently cold formed in a jaw tool with at least two movable jaws whose inner wall has at least one section with a contour designed as a negative to form helical grooves.
  • the cold forming process is triggered by an axially movable plunger which engages the free end of the blank located in the guide die. Due to the applied pressing force of the blank is pressed without prior heating at least partially through the central opening of the closed jaw tool. In this case, helical grooves are produced on the lateral surface of the blank during the contact with the tool contour by plastic cold deformation. After completion of the cold pressing process, the baking tool is opened and the formed into a drill or a worm blank removed from this.
  • upstream cold forming stages can be provided in which the shank and / or head of the blank are preformed.
  • a prefabricated blank is inserted into a multi-part jaw tool with the jaws open in the initial state, so that at least at the points where the jaws are open, located in the axial direction extending recesses.
  • the individual jaws of the pressing tool have on their inner side for forming the radial outer contour a corresponding inner profiling as a negative.
  • a thread is pressed onto the shaft-shaped section of the finished blank.
  • By formed in the shank-shaped portion of the blank recesses prevents material from getting into the jaws of the baking tool during the pressing process. In the region of the recesses extending in the axial direction, no radial outer contour is produced during the pressing process.
  • Such a screw is used for connecting semi-rigid materials.
  • the preparation of this screw is done by winding a cut wire section.
  • the helical pitch at the head end is smaller than at the tip side area.
  • the production by winding wire is, especially when more stable screw elements are required, associated with a high cost. In addition, so only screw with a single helix can be produced.
  • the invention has for its object to provide a method for the production of components from metallic materials, which is suitable for economical mass production of components with more stable helices and with slight technological changes, the production of different embodiments, especially those with multiple helices or helices , allows. Furthermore, a device suitable for carrying out the method is to be provided.
  • a rod-shaped blank made of solid material or a sleeve designed as an elongate component is used.
  • the blank may also consist of a sleeve which has at one end a section made of solid material.
  • the blank may be prefabricated, e.g. as part of a complex production in a multi-stage press.
  • a preformed blank may be used which consists of a shaft-shaped section with one or more longitudinally extending, eccentrically arranged strands. Both a rod made of solid material or the like and a sleeve can be preformed into a blank with one strand or two strands or so-called "legs" or "legs".
  • a single rod-shaped strand or a plurality of strands arranged parallel to one another is / are converted into a helix or a plurality of helices twisted into one another.
  • the prefabricated or preformed blank is inserted or inserted into a guide and subsequently formed by extrusion in at least one multi-part jaw tool with at least two movable jaws whose inner wall is provided with a helical contour designed as a negative.
  • the guide may be a guide die or the jaws of the jaw tool may have a corresponding guide.
  • the forming force required for extrusion is generated by means of a force acting on the free end of the blank press ram.
  • the shank of the blank is at least formed into a stable strand with a nearly constant cross-section as a helix. This is only made possible by the offset between the centroid of the outlet opening of the jaw tool relative to the outgoing from the centroid of the central opening of the guide normals.
  • the jaw tool is opened and the component produced with one or more helix transformed strand / strands taken from this.
  • Helices in the aforementioned sense are curves with a constant, increasing, or decreasing radius.
  • a preferred variant of the method consists in that, in an extrusion process, two or more strands can be formed synchronously at a distance from one another as helices, the individual strands being wound around each other without contact, in the manner of a two-start screw.
  • a variant of the invention may also be that in the middle of the blank, along the longitudinal central axis, a first straight strand is pressed and the second strand, whose longitudinal central axis is offset to the longitudinal central axis of the first strand, is pressed as a single helix, which during the pressing process winds around the first strand.
  • the first straight strand may have a tip at its end, the z. B. is used as a centering in the case of a screw.
  • the straight strand can also already be produced as part of a prefabrication of the blank.
  • a component according to the invention can also consist of at least two mutually parallel, longitudinally extending stable strand-like arms with a constant or in the pressing direction decreasing cross section each in the form of a helix.
  • the original shaft of the blank is formed into at least two helical strands starting at the head section.
  • the strands are arranged relative to one another in such a way that their areas of center of gravity are at a distance from the longitudinal center line of the head section by a certain amount, that is to say an offset.
  • the amount of offset is usually in the millimeter range.
  • Such fastening or connecting means allow a variety of different design and applications in industry and construction.
  • a stable mandrel can be centrally inserted and fixed in the opening of the jaw tool.
  • the helical strands formed during the pressing process wind around the mandrel or surround it.
  • the mandrel is removed again and the jaw removal tool is opened.
  • the mandrel can protrude into the opening of the baking tool or even protrude from the tool.
  • the mandrel When using a sleeve as a blank, the mandrel is pushed to the upper end of the sleeve or even protruding.
  • the lower portion of the ram is also formed as a sleeve, which during the pressing process on the mandrel pushes.
  • the manufactured component is longer than the blank used after the pressing process. There is a change in length. By the pressing process, a material hardening of the helix strands occurs simultaneously.
  • All process steps, starting from a cut rod or wire section, can be carried out in a multi-stage press.
  • the blank can be heated before the extrusion process.
  • the blanks may be made of different metallic materials, e.g. Aluminum, copper, steel or alloys that can be formed by extrusion.
  • the helical strands produced by the extrusion process may have different cross-sectional shapes, e.g. round, oval, elliptical, polygonal (square, hexagon).
  • the opening of the baking tool is adapted to the corresponding cross-sectional shape.
  • the opening of the jaws can also have a cross-sectional shape which changes in the pressing direction and which is round, for example, at the point of entry into the jaw tool and elliptical or oval at the exit point.
  • the shape-forming contour of the jaws may be different, in particular with regard to arc length, curvature and torsion or pitch of the helix.
  • the individual helices or strands can be spaced apart from one another in different parallel directions, or it is also possible to form two or more helices which are intertwined and which do not touch one another. Also possible is a design with a straight strand and a helix that is wound around this strand.
  • the inner contour of the jaw tools is designed so that the adjacent helices are offset depending on the number of helices in the pitch. In a two-helix version, these are offset by half a turn or pitch.
  • a multi-part jaw tool For the production of components according to the invention with a plurality of helix strands, a multi-part jaw tool can be used, which has eccentrically arranged press openings, which are delimited by the peripheral jaws and a central core or insert. It can also be small single jaw tools are used, with a jaw tool is provided for each helix strand.
  • the outer boundary of the helices may be greater than or less than or equal to the outer diameter of the blank or the outer periphery of the head portion.
  • screws, threaded bolts and anchoring elements such as concrete anchor dowels or the like, can be produced by the process according to the invention.
  • the helical strands are slightly compressed.
  • rotatable screws can be produced according to this procedure, which are used in mixing, conveying and metering units or are used as gear worms for power transmission.
  • the components produced according to the invention can subsequently be replaced by further forming operations, e.g. for the formation of the head section, to be treated. If necessary, the strand (s) formed into a helix can also be subsequently transformed.
  • Fig. 1 three different embodiments of the invention produced components in perspective view
  • Fig. 2 different variants of blanks in a simplified representation as a longitudinal section
  • FIG. 3 shows the individual method steps A, B and C for producing a screw with a helical strand, in a simplified representation
  • FIG. 4 shows a section along the line A-A in Fig. 3 in an enlarged view
  • Fig. 6 is a section along the line A-A in Fig. 5, in an enlarged view, and Fig. 7 shows the individual process steps A, B and C for producing a dowel with two helical strands, in a simplified representation.
  • FIG. 1 shows various components 1 produced by the method according to the invention.
  • Figure a) shows a countersunk screw
  • Figure b) a fixing anchor
  • Figure c) a dowel.
  • Each of these metallic components 1 consists of a head section 2 and two strands 3 and 4 adjoining it in the axial direction, which are formed as helixes or helices.
  • the two parallel spaced, longitudinally extending stable strands 3, 4 are intertwined without touching each other.
  • Each strand 3, 4 is arranged on the head portion 2, that the centroid of the respective strand 3, 4 is shifted to the center line M in an offset direction Z, as shown in Figure 2 for the strand 4.
  • the individual components according to FIG. 1 differ only in the cross-sectional shape and the pitch of the strands 3, 4 and the head section 2.
  • the extrusion process for the countersunk screw shown in Fig. A) was carried out starting from a blank of solid material.
  • the head section 2 thus also consists of solid material. This is converted at the upper end to a countersunk head 5.
  • the countersunk head is connected to a drive, not shown in more detail, e.g. Slot or Torx, equipped for a screw-in.
  • the head portion 2 of the anchor according to Fig. B) is formed as a sleeve 6.
  • the two strands 3 and 4 have an oval cross-sectional shape and are comparatively stable.
  • Such an anchor may e.g. be used as a concrete anchor.
  • the head portion 2 of the anchor according to Fig. C) is also formed as a sleeve 6.
  • the pitch of the helices or the two strands 3, 4 of the anchor according to Fig. C) is significantly smaller than that of the anchor shown in Fig. B).
  • the sleeve 6 of the anchor may be provided with an internal thread for receiving a screw.
  • Fig. 2 various variants of prefabricated blanks are shown, which can be used for extruding the components 1 according to the invention.
  • the blanks 7, T consist of a shank portion 8 and a head portion 2.
  • a first blank 7 made of solid material, e.g. as a cylindrical rod. This can be made in an upstream Umformlay by upsetting a wire section.
  • a second blank T is also shown, which differs from the blank 7 according to Fig. A) in that the shaft portion 8 already has two cross-sectionally oval strands 8a and 8b, which were formed in upstream forming stages.
  • the two strands 8a, 8b are straight.
  • the center axes M1 of the two strands 8a and 8b are outside the central axis M of the blank 7 '.
  • the two strands 8a, 8b are respectively formed by extrusion into a helix.
  • the third blank 7 shown in Figure c) is a prefabricated metal sleeve 6.
  • the shank portion 8 of the metal sleeve 6 has already been shaped into two strands 8a and 8b which are oval in cross-section, in a manner analogous to that shown in FIG.
  • the preformed strands 8a and 8b may also be referred to as so-called "legs.”
  • the strands 8a and 8b may also have other cross-sectional shapes.
  • the advantage of using blanks with preformed strands is that it is possible to work with lower press forces.
  • here also the strength of the material used and their compressibility play a role.
  • the device required for the extrusion process consists of a jaw tool 10 with four movable jaws 1 1, a guide die 12 and a ram 13 over which the required pressing force is applied.
  • Baking tools with movable jaws for extrusion of metals are known in the art.
  • the tools may be equipped with a different number of jaws, e.g. B. two, three, four or five jaws.
  • Such a jaw tool consists of an outer, displaceable in the axial direction ring 16, in which the jaws 1 1 are mounted radially movable.
  • the ring 16 is guided on a conical circumferential surface of the jaws 1 1, which tapers in the direction of the opening movement, as seen in step C.
  • the ring 16 has a corresponding with this conical inner surface.
  • the ring 16 For opening and closing the jaw tool, the ring 16 is moved either in the pressing direction or in the opposite direction. In the arrangement of the baking tool within a multi-stage press, the movement of the ring 16 is triggered by an unspecified engagement element by the feed movement of the carriage of the multi-stage press.
  • the opening and closing movement of the jaws 1 1 can also be done in other ways.
  • the sleeve-shaped guide die 12 has a central opening 12 a, whose cross-sectional shape is adapted to the cross-sectional shape of the blank 7.
  • the blank 7 having a head portion 2 and a shaft portion 8 is inserted into the central opening 12a of the guide die 12 (step A).
  • the press die 13 is delivered and brought into contact with the blank 7.
  • the jaw tool 10 is structurally designed so that the centroid F of the limited by the inside of the jaws 1 1 outlet opening relative to the longitudinal centerline M of the tool or the blank 7 or component 1 is displaced in an offset direction Z, as shown in FIG. 4. Only by this offset, it is possible during the extrusion process on the formed as a negative inner contour 1 1 a of the jaws 1 1 to deform the shaft portion 8 of the blank 7 to at least one stable strand 4 as a helix.
  • the deformation of the shaft portion to a Coiled strand 4 is shown in simplified form as process step B. Due to the high pressing forces a length change takes place during the extrusion process.
  • the finished component 1 is longer than the blank used 7.
  • the finished helical component 1 is removed (step C).
  • the punch 13 still takes over the function as an ejector.
  • FIG. 5 shows the method steps A, B and C for producing a screw with two helical strands starting from a cylindrical blank as a solid material.
  • the jaw tool differs from that according to FIG. 3 in that it has two outlet openings 15.
  • the centroid F (indicated by a dashed line) of each of the two outlet openings 15 is displaced with respect to the center line of the tool or of the component in a respective offset direction Z, as shown in FIG.
  • a stable mandrel 14 is also arranged centrally, which extends up to the end face of the blank 7 pushed into the guide die 12 (method step A).
  • FIG. 7 shows the method steps A, B and C for producing a dowel.
  • the blank 7 consists of a sleeve 6, which corresponds to the embodiment shown in Fig. 2, Fig. C).
  • the sleeve 6 is inserted into the guide die 12 and from the bottom, a mandrel 14 is inserted centrally into the sleeve.
  • the outer diameter of the dome 14 is matched to the inner diameter of the sleeve 6, so that it is inserted with the usual game up to the upper end of the sleeve 6.
  • the mandrel 14 additionally acts as a stabilizing element for the sleeve 6 during the pressing process.
  • the lower portion of the ram 13 is also formed as a sleeve, as seen in the figure for step A.
  • the pointing in the pressing direction annular end face of the punch engages the upper end of the sleeve 6 and pushes it slowly through the tool opening 15. This pushes the sleeve-shaped portion of the ram 13 over the fixed mandrel 14.
  • the shaft portion 8 of the sleeve 6 is formed into two helical strands 3 and 4, which wind around the mandrel 14 (step B).
  • the mandrel 14 is completely retracted and the jaw tool 10 for demolding of the component 1, the anchor, opened.
  • a sleeve with two strands 8a and 8b, so-called “legs" according to FIG. 2, d), can also be used as the blank.
  • the head section 2 of the dowel shown can be subsequently transformed.
  • the free ends of the helices can be subsequently deformed to a point. All steps can be carried out in a particularly economical manner on a multi-stage press.
  • components according to the invention can also be produced with three or four helices.

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

Abstract

L'invention concerne un procédé de fabrication d'éléments métalliques comprenant une tige qui est façonnée le long de son axe longitudinal sous la forme d'au moins une partie hélicoïdale et un dispositif approprié pour mettre en œuvre ledit procédé. Le but de l'invention est de mettre au point, en partant des inconvénients de l'état connu de la technique, un procédé qui est approprié pour une production de masse économique d'éléments à parties hélicoïdales plus stables. Selon l'invention, ce but est atteint par le fait qu'une ébauche (7) est introduite dans un élément de guidage (12) et qu'ensuite, dans au moins un outil à mâchoires (10) en plusieurs parties comprenant au moins deux mâchoires mobiles (11) dont la paroi intérieure est dotée d'un contour (11a) de forme hélicoïdale conçu en tant que négatif, la tige (8) de l'ébauche est façonnée par extrusion en étant poussée à l'aide d'un poinçon (13) s'appliquant à l'extrémité libre de l'ébauche (7) à travers une ouverture de sortie de l'outil à mâchoires (10) dont le centre de gravité de surface est déplacé par rapport à la ligne centrale M de l'outil (10) ou de l'élément (1) dans une direction de décalage, à la suite de quoi la tige (8) de l'ébauche (7) est façonnée sous la forme d'au moins une barre stable (4) en tant que partie hélicoïdale.
PCT/DE2013/100029 2012-01-30 2013-01-28 Procédé et dispositif de fabrication d'éléments métalliques comprenant une tige déformée le long de son axe longitudinal en au moins une partie hélicoïdale WO2013113312A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210100723 DE102012100723B3 (de) 2012-01-30 2012-01-30 Verfahren und Vorrichtung zur Herstellung von metallischen Bauteilen mit einem Schaft, der entlang seiner Längsachse zu mindestens einer Helix verformt ist
DE102012100723.3 2012-01-30

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WO2013113312A1 true WO2013113312A1 (fr) 2013-08-08

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DE (1) DE102012100723B3 (fr)
TW (1) TW201350224A (fr)
WO (1) WO2013113312A1 (fr)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
US10285436B2 (en) 2013-11-22 2019-05-14 British American Tobacco (Investments) Limited Adsorbent materials
CN113894171A (zh) * 2021-10-13 2022-01-07 北京科技大学 螺旋杆三辊驱动挤压成形装置及工艺
CN113894170A (zh) * 2021-10-13 2022-01-07 北京科技大学 空心螺旋杆双辊驱动挤压成形装置及工艺

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CN109016449B (zh) * 2018-08-30 2023-11-24 华南理工大学 基于动态延展的超高分子量聚合物轧制成型方法及设备
CN111421009B (zh) * 2020-02-27 2021-06-29 北京科技大学 一种螺杆泵转子转模挤压成形工艺及成形装置
CN111940689B (zh) * 2020-06-24 2022-04-19 合肥工业大学 一种通过增材技术制造螺杆转子的模具及其使用方法
CN113894173B (zh) * 2021-10-13 2022-11-15 北京科技大学 空心螺旋杆三辊驱动挤压成形装置及工艺

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GB1219237A (en) * 1969-04-08 1971-01-13 Leon Simons Vibration-resistant screw
DE3116101C2 (de) 1981-04-23 1983-04-21 Thermotect-Brandschutzmaterial GmbH, 3181 Jembke Schraubelement zum Verbinden halbstarrer Matten
WO2010142458A2 (fr) 2009-06-12 2010-12-16 Sieber Forming Solutions Gmbh Procédé et dispositif permettant de fabriquer des pièces en métal de forme allongée pourvues de rainures hélicoïdales, en particulier des forets hélicoïdaux ou des vis sans fin
EP2156909B1 (fr) 2008-08-19 2011-11-09 Sieber Forming Solutions Gmbh Procédé de fabrication de moyens de fixation ou de liaison dotés de contours extérieurs radiaux, notamment des vis ou des boulons filetés

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AU542086B2 (en) * 1979-04-10 1985-02-07 Automotive Products Ltd. Extrusion nozzle for annular friction facings
JPH0679741B2 (ja) * 1990-06-01 1994-10-12 昭和アルミニウム株式会社 ねじり材のねじり押出用ダイス
DE60238720D1 (de) * 2002-06-03 2011-02-03 Mitsubishi Electric Corp Sammelverfahren für elektrische geräte und elektrisches gerät

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Publication number Priority date Publication date Assignee Title
GB1219237A (en) * 1969-04-08 1971-01-13 Leon Simons Vibration-resistant screw
DE3116101C2 (de) 1981-04-23 1983-04-21 Thermotect-Brandschutzmaterial GmbH, 3181 Jembke Schraubelement zum Verbinden halbstarrer Matten
EP2156909B1 (fr) 2008-08-19 2011-11-09 Sieber Forming Solutions Gmbh Procédé de fabrication de moyens de fixation ou de liaison dotés de contours extérieurs radiaux, notamment des vis ou des boulons filetés
WO2010142458A2 (fr) 2009-06-12 2010-12-16 Sieber Forming Solutions Gmbh Procédé et dispositif permettant de fabriquer des pièces en métal de forme allongée pourvues de rainures hélicoïdales, en particulier des forets hélicoïdaux ou des vis sans fin

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10285436B2 (en) 2013-11-22 2019-05-14 British American Tobacco (Investments) Limited Adsorbent materials
CN113894171A (zh) * 2021-10-13 2022-01-07 北京科技大学 螺旋杆三辊驱动挤压成形装置及工艺
CN113894170A (zh) * 2021-10-13 2022-01-07 北京科技大学 空心螺旋杆双辊驱动挤压成形装置及工艺
CN113894171B (zh) * 2021-10-13 2022-12-02 北京科技大学 螺旋杆三辊驱动挤压成形装置及工艺

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TW201350224A (zh) 2013-12-16

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