EP2292347B1 - Méthode de fabrication d'un boulon - Google Patents

Méthode de fabrication d'un boulon Download PDF

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Publication number
EP2292347B1
EP2292347B1 EP10174806A EP10174806A EP2292347B1 EP 2292347 B1 EP2292347 B1 EP 2292347B1 EP 10174806 A EP10174806 A EP 10174806A EP 10174806 A EP10174806 A EP 10174806A EP 2292347 B1 EP2292347 B1 EP 2292347B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
longitudinal direction
tie
bolt
mould
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
EP10174806A
Other languages
German (de)
English (en)
Other versions
EP2292347A1 (fr
Inventor
Gaetano Mauri
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.)
Flli Mauri Srl
Original Assignee
Flli Mauri Srl
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 Flli Mauri Srl filed Critical Flli Mauri Srl
Publication of EP2292347A1 publication Critical patent/EP2292347A1/fr
Application granted granted Critical
Publication of EP2292347B1 publication Critical patent/EP2292347B1/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
    • B21K1/44—Making machine elements bolts, studs, or the like
    • B21K1/46—Making machine elements bolts, studs, or the like with heads
    • B21K1/463—Making machine elements bolts, studs, or the like with heads with recessed heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • 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
    • B21K1/44—Making machine elements bolts, studs, or the like
    • B21K1/46—Making machine elements bolts, studs, or the like with heads
    • 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
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs

Definitions

  • the present invention relates to a method for producing shaped pins/tie-bolts, particularly, but not exclusively, to be associated with devices for joining two parts arranged at 90° relative to each other.
  • screw/female thread means are widely used, these essentially consisting of a cylindrical tie-bolt, to be concealingly inserted inside a corresponding seat/bushes of one of the two parts and designed to form the part reacting against a grub screw which engages in the transverse direction with said cylindrical member, being screwed onto the female thread of a bush integral with the other part to be joined and thus causing pulling together of the two parts which bear against each other, remaining fastened together.
  • DE-U-93 19 728 also discloses a method for forming a solid workpiece which envisages insertion of the said workpiece inside moulds where it is shortened and shaped to the final size of the finished workpiece.
  • this method envisages however the need to start with a workpiece having an initial size larger than its final size, thereby producing a large amount of machining swarf and wasted material.
  • the technical problem which is posed, therefore, is to develop a method for the simple and low-cost production of shaped pins/tie-bolts, particularly, but not exclusively suitable for association with a device for joining together two parts, for example the component parts of a piece of furniture or the like.
  • this method should allow the production of pins/tie-bolts which are in any case shaped, but sufficiently strong, with a substantial saving in material, and, if necessary, provided with means for operation using normal standardized tools by any user, even without specialized skills.
  • the method for producing a pin/tie-bolt according to the present invention comprises essentially the following steps:
  • FIGS 2a,2b and 3a,3b show two pins/tie-bolts 110,210, respectively, which, in addition to the different threading, also have different lengths of the two top and bottom cylindrical sections and of the middle collar.
  • tie-bolts and/or pins generally in a simple, low cost and versatile manner, by means of machining steps which are all cold-machining steps, without the need for subsequent intermediate machine-tool operations, with obvious advantages in terms of reduction of the tooling, production downtime and therefore final costs of the workpiece.
  • the top cylindrical part ( Fig. 1c ) with associated inset seat may be obtained in a single pass, omitting step 1b, and in the same way closing of the cylindrical top part ( Fig. 1e ) may be obtained in a single pass 1e, omitting step 1d.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
  • Joining Of Building Structures In Genera (AREA)

Claims (6)

  1. Procédé de fabrication d'un boulon à broche ou d'ancrage (110 ; 210) s'étendant dans la direction longitudinale (X-X) comportant les étapes comprenant le fait de :
    a) fournir une pièce à usiner solide (10a) constituée d'un matériau approprié et présentant une longueur appropriée dans la direction longitudinale et une largeur/un diamètre approprié(e) dans la direction transversale ;
    dans lequel la longueur suivant la direction longitudinale de la pièce à usiner solide (10a) initiale est inférieure à la longueur dans la direction longitudinale du boulon à broche ou d'ancrage fini ;
    c) comprimer la pièce à usiner solide (10b) à l'intérieur d'un second moule (20c) associé à un second poinçon (30c) avec formation d'une pièce à usiner (10c) présentant une longueur dans la direction longitudinale étirée à la dimension finale souhaitée et dotée d'une cavité longitudinale interne (11 c) présentant une profondeur finale appropriée ;
    e) comprimer dans la direction transverse la pièce à usiner (10d) à l'intérieur d'un quatrième moule (20e) avec un étirement orienté longitudinalement et une fermeture partielle de la cavité interne longitudinale avec formation d'une pièce à usiner (10e) qui présente une partie supérieure cylindrique (10f1) fermée au diamètre final souhaité, un épaulement de raccordement conique creux (13e) présentant la dimension finale et une partie centrale cylindrique creuse (10f2) d'un diamètre plus grand que celui de la partie supérieure cylindrique (10f1) et présentant la dimension finale.
  2. Procédé selon la revendication 1, caractérisé en ce que l'étape c) est précédée d'une étape de pré-formage qui envisage de :
    b) enfermer la pièce à usiner solide (10a) à l'intérieur d'un premier moule (20b) avec compression de la pièce à usiner solide et une insertion simultanée dans la direction longitudinale (X-X) d'un premier poinçon (30b) d'une longueur appropriée dans la direction axiale et une compression simultanée et une mise en forme de la partie inférieure (12b) du boulon à broche ou d'ancrage de façon à préparer celui-ci à l'étape c) suivante.
  3. Procédé selon la revendication 1, caractérisé en ce que l'étape e) est précédée d'une étape de pré-formage qui envisage de :
    d) comprimer la partie creuse de la pièce à usiner (10c) en laissant le second moule (20c) à l'intérieur d'un troisième moule (20d) de façon à former une pièce à usiner (10d), dont la partie supérieure présente un diamètre plus petit, un épaulement conique creux (13d) raccordant ensemble la partie supérieure cylindrique creuse (10d1) de diamètre plus petit et une partie centrale cylindrique creuse (10d2) de diamètre supérieur.
  4. Procédé selon la revendication 1, caractérisé en ce qu'il comporte une étape supplémentaire impliquant de :
    g) laminer le boulon à broche ou d'ancrage de façon à produire une tige inférieure filetée (112 ; 212).
  5. Procédé selon la revendication 1, caractérisé en ce qu'il comporte une étape supplémentaire impliquant de :
    f) poinçonner l'extrémité supérieure suivant une direction coaxiale afin de former une tête (14f) avec une embase incrustée appropriée pour être rendue opérationnelle au moyen d'un outil.
  6. Procédé selon la revendication 1, caractérisé en ce que les étapes de formage sont des étapes de formage à froid.
EP10174806A 2009-09-04 2010-09-01 Méthode de fabrication d'un boulon Active EP2292347B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001532A ITMI20091532A1 (it) 2009-09-04 2009-09-04 Procedimento per la produzione di un perno/tirante

Publications (2)

Publication Number Publication Date
EP2292347A1 EP2292347A1 (fr) 2011-03-09
EP2292347B1 true EP2292347B1 (fr) 2012-03-14

Family

ID=42102609

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10174806A Active EP2292347B1 (fr) 2009-09-04 2010-09-01 Méthode de fabrication d'un boulon

Country Status (3)

Country Link
EP (1) EP2292347B1 (fr)
AT (1) ATE549109T1 (fr)
IT (1) ITMI20091532A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01202333A (ja) * 1988-02-05 1989-08-15 Sakamura Kikai Seisakusho:Kk 円錐案内部をもつロボット用ボルトの製造方法
DE9319728U1 (de) * 1993-12-22 1994-06-16 Moehling Gmbh & Co Bolzen mit einer Ausformung in Form einer Spitze, Kugel o.dgl.
DE19918196A1 (de) * 1999-04-22 2000-10-26 Heinrich Hofsaes Gmbh & Co Stellschraube
JP2008213040A (ja) * 2007-01-22 2008-09-18 Nishio Seimitsu Kk 中空鍛造部材及び中空鍛造部材の製造方法

Also Published As

Publication number Publication date
EP2292347A1 (fr) 2011-03-09
ATE549109T1 (de) 2012-03-15
ITMI20091532A1 (it) 2011-03-05

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