EP0796680B1 - Method for the manufacture of screw bolts or threaded tie bars - Google Patents
Method for the manufacture of screw bolts or threaded tie bars Download PDFInfo
- Publication number
- EP0796680B1 EP0796680B1 EP97410029A EP97410029A EP0796680B1 EP 0796680 B1 EP0796680 B1 EP 0796680B1 EP 97410029 A EP97410029 A EP 97410029A EP 97410029 A EP97410029 A EP 97410029A EP 0796680 B1 EP0796680 B1 EP 0796680B1
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- European Patent Office
- Prior art keywords
- groove
- rolling
- thread
- diameter
- rod
- 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.)
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Classifications
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- 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
- B21H3/022—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling combined with rolling splines, ribs, grooves or the like, e.g. using compound dies
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- 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
- B21H3/04—Making by means of profiled-rolls or die rolls
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- 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
- B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
- B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
- B21H7/187—Rolling helical or rectilinear grooves
Definitions
- the present invention relates to a process for obtaining by deformation of a threaded rod provided with a locking groove, the device intended to implement said process as well as the threaded rod obtained by this process.
- the deformation threading processes consist in performing a thread by plastically deforming the envelope or external surface of a cylindrical rod.
- One can during this plastic deformation obtain a diameter at the top of the thread greater than the initial pitch diameter of said rod, itself greater than the diameter at the bottom of the thread, the material being moved from the bottom of the nets to form the top of the nets.
- a tie rod or a so-called reduced rod stud the diameter of the unthreaded part being equal to the diameter of the thread flank.
- Such threaded rods of the stud or pulling type during their implantation, pose a major drawback when tightening, such a stud or pulling reduced stem thus tends to implant along a random length before being blocked.
- tie rods or studs of the normal rod type i.e. tie rods or studs whose diameter of the smooth part is equal to or greater than diameter at the top of the threaded part.
- the process of manufacturing requires that a reduction be made before deformation in diameter of the part intended to be deformed for the realization of the thread.
- the improvement provided by the present invention is therefore proposes to allow obtaining the thread and the groove deformation blocking ring simultaneously to avoid a rework of the part, causing a loss of time which, when of the production in high quantity of this type of studs or tie rods, can become very important.
- the method of producing a rod comprising at least one thread produced by deformation is characterized in that it consists in making an annular groove for blocking by deformation, said blocking groove having a diameter at the bottom of groove greater than the diameter at the bottom of the net.
- the thread and the groove blocking ring are made simultaneously, by a process rolling nets. While it consists in making said groove locking ring, so that it is positioned between the thread of the rod and its non-threaded part.
- the rolling tool intended to implement the method is characterized in that said groove rolling disc has a projection rolling circular, and the external diameter of said projection is less than diameter measured at the top of the thread of the external rolling thread, said groove rolling disc have a circular rolling projection of rounded shape at the top.
- the reduced rod studs obtained by the process are characterized in that the annular blocking groove is located between the threaded part and the non-threaded central part, while the diameter measured at the bottom of the groove is greater than the diameter measured in bottom of the net.
- Figures 1 and 2 show a rolling tool allowing the implementation of the process as well as the diagram of the rolling of nets by such a tool.
- FIG. 1 represents a rolling head or laminator seen from profile.
- Figure 3 shows a wheel in longitudinal section.
- Figure 4 shows a detail of Figure 1 concerning the part of the tool intended to produce the annular locking groove.
- Figures 5, 6 and 7 relate to an example of a stud-type threaded rod obtained by the process according to the invention.
- FIG. 5 is an example of a stud with a reduced rod whose ends are chamfered.
- Figure 6 is another stud with reduced rod whose ends are gross rolling.
- FIG. 7 shows in detail the annular groove for blocking the stud in longitudinal section.
- the improvement of the process for producing a rod threaded type studs or tie rods consists of performing by deformation on said threaded rod (1) an annular locking groove (2).
- said method annular locking groove (2) is produced simultaneously with the thread of the threaded rod (1) by deformation according to a thread rolling process.
- This rolling process can advantageously be according to the mode of placing.
- a rolling head (3) comprising at least two rollers (4a, 4b) of rolling, as illustrated in Figures 1 and 2.
- it can also be type with three or more wheels or planetary (a wheel turning in front a fixed concave sector) or with flat matrices, without leaving the part of the invention.
- the process therefore consists in carrying out by rolling on a rod at minus a thread (5) and an annular locking groove (2), so that that said groove (2) is positioned between the thread (5) and the part of unthreaded rod (6).
- Said annular locking groove (2) is made so that the diameter at the bottom of the groove D1 is greater than the diameter at the bottom of the thread D2, as illustrated in FIG. 5 and FIG. 7, in order to avoid the possible problems of rupture caused by the realization of a circular groove and therefore of a critical section for resistance to longitudinal traction perpendicular to said section.
- it consists in carrying out an annular locking groove (2) whose width measured at its vertex is greater than the pitch of the adjacent thread (5) produced by said rolling process.
- the method advantageously consists in making the thread (5) and the groove annular blocking (2) on a rod (1), so as to obtain a stud, a tie rod or a threaded rod, called a reduced rod, that is to say the diameter D3 of the non-threaded portion (6) is substantially equal to diameter flank D8.
- the device for implementing the method according to the invention is composed of a rolling tool (7) which can be of the flat die type, planetary or rolling heads (3) with rollers (4).
- said dies are provided with a longitudinal projection intended to obtaining the annular groove, said projection having an angle (not zero) with the oblique penetration projections intended to obtain the thread.
- the rolling tool is of the planetary type and includes a wheel equipped with a flange or rolling disc of groove for performing an annular locking groove (2) during the rotation of said wheel (4) in front of a fixed concave sector.
- the rolling tool (7) intended to be used during the setting mode preferred implementation of the method is a tool having at least two wheels (4a, 4b) mounted on a rolling head (3), as illustrated in figure 1, said tool working while diving, that is to say during a process of rolling of the radial or tangential type.
- Said tool can, for example, include three or more knobs (4), without going beyond the ambit of the invention.
- rollers (4) of the rolling head (3) intended to set works the preferred mode of the process are cylindrical and have along their length an external rolling thread (8) intended to make the thread (5) of the rod (1) causing the formation during rolling said thread (5) by deformation of the surface of the blank cylindrical of the rod (1), deformation due to the penetration of the threads of said external rolling thread (8) in said surface.
- knobs (4) have at their ends (10a, 10b), in a manner known per se, a chamfer (11) an angle or an entry radiated allowing the release of the deformed material during rolling at the start and end of the net.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
La présente invention concerne un procédé d'obtention par déformation d'une tige filetée munie d'une gorge de blocage, le dispositif destiné à mettre en oeuvre ledit procédé ainsi que la tige filetée obtenue par ce procédé.The present invention relates to a process for obtaining by deformation of a threaded rod provided with a locking groove, the device intended to implement said process as well as the threaded rod obtained by this process.
Les procédés de filetage par déformation consistent à effectuer un filetage en déformant plastiquement l'enveloppe ou surface externe d'une tige cylindrique. On peut lors de cette déformation plastique obtenir un diamètre en sommet de filet supérieur au diamètre primitif initial de ladite tige, lui-même supérieur au diamètre en fond de filet, la matière étant déplacée du fond des filets pour former le sommet des filets. On obtient alors par un tel procédé un tirant ou un goujon dit à tige réduite, le diamètre de la partie non filetée étant égal au diamètre à flanc de filet. De telles tiges filetées du type goujon ou tirant, lors de leur implantation, posent un inconvénient majeur lors du serrage, un tel goujon ou tirant à tige réduite a ainsi tendance à s'implanter selon une longueur aléatoire avant de subir son blocage.The deformation threading processes consist in performing a thread by plastically deforming the envelope or external surface of a cylindrical rod. One can during this plastic deformation obtain a diameter at the top of the thread greater than the initial pitch diameter of said rod, itself greater than the diameter at the bottom of the thread, the material being moved from the bottom of the nets to form the top of the nets. We then obtains by such a method a tie rod or a so-called reduced rod stud, the diameter of the unthreaded part being equal to the diameter of the thread flank. Such threaded rods of the stud or pulling type, during their implantation, pose a major drawback when tightening, such a stud or pulling reduced stem thus tends to implant along a random length before being blocked.
Afin d'éviter un tel inconvénient, il est possible de réaliser des tirants ou des goujons du type à tige normale, c'est-à-dire des tirants ou des goujons dont le diamètre de la partie lisse est égal ou supérieur au diamètre en sommet de filet de la partie filetée. Toutefois, le processus de fabrication nécessite que soit réalisée avant déformation une diminution de diamètre de la partie destinée à être déformée pour la réalisation du filetage. In order to avoid such a disadvantage, it is possible to carry out tie rods or studs of the normal rod type, i.e. tie rods or studs whose diameter of the smooth part is equal to or greater than diameter at the top of the threaded part. However, the process of manufacturing requires that a reduction be made before deformation in diameter of the part intended to be deformed for the realization of the thread.
On connait par le document JP-A-58 097 453 un procédé qui permet de réaliser par déformation une bague d'arrêt disposée à l'extrémité du filetage d'une tige munie d'un écrou plat rapporté.We know from document JP-A-58 097 453 a process which makes it possible to produce by deformation a stop ring arranged at the end of the thread a rod fitted with an attached flat nut.
C'est afin de remédier à cet inconvénient que la présente invention consiste à effectuer une gorge annulaire de blocage par déformation.It is in order to remedy this drawback that the present invention consists in making an annular groove for blocking by deformation.
De plus, les procédés de roulage actuels ne prévoient pas la possibilité d'effectuer une telle gorge lors du filetage de la tige et contraignent ainsi l'utilisateur à faire réaliser celle-ci par taillage ou autre procédé, nécessitant de ce fait ce qu'il est convenu d'appeler une reprise de la pièce.In addition, current rolling processes do not provide for the possibility of making such a groove when threading the rod and thus force the user to have it carried out by cutting or other process, thereby necessitating what is known as a recovery of the room.
Le perfectionnement apporté par la présente invention se propose donc de permettre l'obtention du filetage et de la gorge annulaire de blocage par déformation, de manière simultanée afin d'éviter une reprise de la pièce, occasionnant une perte de temps qui, lors de la production en haute quantité de ce type de goujons ou tirants, peut devenir très importante. The improvement provided by the present invention is therefore proposes to allow obtaining the thread and the groove deformation blocking ring simultaneously to avoid a rework of the part, causing a loss of time which, when of the production in high quantity of this type of studs or tie rods, can become very important.
Ainsi, selon l'invention, le procédé de réalisation d'une tige comprenant au moins un filetage réalisé par déformation, est caractérisé en ce qu'il consiste à réaliser une gorge annulaire de blocage par déformation, ladite gorge de blocage possédant un diamètre en fond de gorge supérieur au diamètre en fond de filet.Thus, according to the invention, the method of producing a rod comprising at least one thread produced by deformation, is characterized in that it consists in making an annular groove for blocking by deformation, said blocking groove having a diameter at the bottom of groove greater than the diameter at the bottom of the net.
Selon une caractéristique complémentaire, le filetage et la gorge annulaire de blocage, sont réalisés de manière simultanée, par un procédé de roulage des filets. Tandis que qu'il consiste à réaliser ladite gorge annulaire de blocage, de manière à ce qu'elle soit positionnée entre le filetage de la tige et sa partie non filetée.According to an additional characteristic, the thread and the groove blocking ring, are made simultaneously, by a process rolling nets. While it consists in making said groove locking ring, so that it is positioned between the thread of the rod and its non-threaded part.
L'outil de roulage destiné à mettre en oeuvre le procédé est caractérisé en ce que ledit disque de roulage de gorge possède une saillie circulaire de roulage, et le diamètre externe de ladite saillie est inférieur au diamètre mesuré au sommet de filet du filetage externe de roulage, ledit disque de roulage de gorge possèdent une saillie circulaire de roulage de forme arrondie à son sommet.The rolling tool intended to implement the method is characterized in that said groove rolling disc has a projection rolling circular, and the external diameter of said projection is less than diameter measured at the top of the thread of the external rolling thread, said groove rolling disc have a circular rolling projection of rounded shape at the top.
Selon une autre caractéristique, les goujons à tige réduite obtenu par le procédé sont caractérisés en ce que la gorge annulaire de blocage est située entre la partie filetée et la partie centrale non filetée, tandis que le diamètre mesuré en fond de gorge est supérieur au diamètre mesuré en fond de filet. According to another characteristic, the reduced rod studs obtained by the process are characterized in that the annular blocking groove is located between the threaded part and the non-threaded central part, while the diameter measured at the bottom of the groove is greater than the diameter measured in bottom of the net.
D'autres caractéristiques et avantages de l'invention se dégageront de la description qui va suivre en regard des dessins annexés qui ne sont donnés qu'à titre d'exemples non limitatifs.Other characteristics and advantages of the invention will emerge of the description which will follow with regard to the appended drawings which are not given only by way of nonlimiting examples.
Les figures 1 et 2 représentent un outil de roulage permettant la mise en oeuvre du procédé ainsi que la schématisation du roulage des filets par un tel outil.Figures 1 and 2 show a rolling tool allowing the implementation of the process as well as the diagram of the rolling of nets by such a tool.
La figure 1 représente une tête de roulage ou lamineur vue de profil.FIG. 1 represents a rolling head or laminator seen from profile.
La figure 2 représente le roulage des filets par les deux molettes de ladite tête.Figure 2 shows the rolling of the nets by the two knobs of said head.
Les figures 3 et 4 concernent la molette d'un outil de roulage, destinée à mettre en oeuvre le procédé selon l'invention.FIGS. 3 and 4 relate to the wheel of a rolling tool, intended to implement the method according to the invention.
La figure 3 représente une molette en coupe longitudinale.Figure 3 shows a wheel in longitudinal section.
La figure 4 représente un détail de la figure 1 concernant la partie de l'outil destinée à réaliser la gorge annulaire de blocage.Figure 4 shows a detail of Figure 1 concerning the part of the tool intended to produce the annular locking groove.
Les figures 5, 6 et 7 concernent un example d'une tige filetée du type goujon obtenue par le procédé selon l'invention.Figures 5, 6 and 7 relate to an example of a stud-type threaded rod obtained by the process according to the invention.
La figure 5 est un exemple de goujon à tige réduite dont les extrémités sont chanfreinées.FIG. 5 is an example of a stud with a reduced rod whose ends are chamfered.
La figure 6 est un autre goujon à tige réduite dont les extrémités sont brutes de roulage.Figure 6 is another stud with reduced rod whose ends are gross rolling.
La figure 7 représente en détail la gorge annulaire de blocage du goujon en coupe longitudinale. FIG. 7 shows in detail the annular groove for blocking the stud in longitudinal section.
Ainsi, le perfectionnement du procédé de réalisation d'une tige filetée du type goujons ou tirants consiste à effectuer par déformation sur ladite tige filetée (1) une gorge annulaire de blocage (2).Thus, the improvement of the process for producing a rod threaded type studs or tie rods consists of performing by deformation on said threaded rod (1) an annular locking groove (2).
Selon le mode préféré de mise en oeuvre du procédé, ladite gorge annulaire de blocage (2) est réalisée simultanément au filetage de la tige filetée (1) par déformation selon un procédé de roulage des filets. Ce procédé de roulage peut être avantageusement selon le mode de mise en oeuvre préféré du type roulage tangentiel ou roulage radial grâce à une tête de roulage (3) comprenant au moins deux molettes (4a, 4b) de roulage, tel qu'illustré figures 1 et 2. Cependant, il peut également être du type à trois molettes ou plus ou planétaire (une molette tournant devant un secteur concave fixe) ou à matrices planes, sans pour autant sortir du cadre de l'invention.According to the preferred method of implementing the method, said method annular locking groove (2) is produced simultaneously with the thread of the threaded rod (1) by deformation according to a thread rolling process. This rolling process can advantageously be according to the mode of placing. preferred implementation of the tangential rolling or radial rolling type thanks to a rolling head (3) comprising at least two rollers (4a, 4b) of rolling, as illustrated in Figures 1 and 2. However, it can also be type with three or more wheels or planetary (a wheel turning in front a fixed concave sector) or with flat matrices, without leaving the part of the invention.
Le procédé consiste donc à réaliser par roulage sur une tige au moins un filetage (5) et une gorge annulaire de blocage (2), de façon à ce que ladite gorge (2) soit positionnée entre le filetage (5) et la partie de tige non filetée (6). Ladite gorge annulaire de blocage (2) est realisée de manière à ce que le diamètre en fond de gorge D1 soit supérieur au diamètre en fond de filet D2, tel qu'illustré figure 5 et figure 7, afin d'éviter les problèmes de rupture éventuels occasionnés par la réalisation d'une gorge circulaire et donc d'une section critique pour la résistance à la traction longitudinale perpendiculaire à ladite section. Selon une caractéristique complémentaire dudit procédé, celui-ci consiste à réaliser une gorge annulaire de blocage (2) dont la largeur mesurée à son sommet est supérieure au pas du filetage (5) adjacent réalisé par ledit procédé de roulage. Elle peut avantageusement, selon le mode de mise en oeuvre préféré, être égale à une fois et demie la valeur du pas. De plus, le procédé consiste avantageusement à effectuer le filetage (5) et la gorge annulaire de blocage (2) sur une tige (1), de manière à obtenir un goujon, un tirant ou une tige filetée, dit(e) à tige réduite, c'est-à-dire dont le diamètre D3 de la portion non filetée (6) est égal sensiblement au diamètre à flanc de filet D8.The process therefore consists in carrying out by rolling on a rod at minus a thread (5) and an annular locking groove (2), so that that said groove (2) is positioned between the thread (5) and the part of unthreaded rod (6). Said annular locking groove (2) is made so that the diameter at the bottom of the groove D1 is greater than the diameter at the bottom of the thread D2, as illustrated in FIG. 5 and FIG. 7, in order to avoid the possible problems of rupture caused by the realization of a circular groove and therefore of a critical section for resistance to longitudinal traction perpendicular to said section. According to one additional characteristic of said process, it consists in carrying out an annular locking groove (2) whose width measured at its vertex is greater than the pitch of the adjacent thread (5) produced by said rolling process. It can advantageously, depending on the mode of implementation preferred work, be equal to one and a half times the value of the step. In addition, the method advantageously consists in making the thread (5) and the groove annular blocking (2) on a rod (1), so as to obtain a stud, a tie rod or a threaded rod, called a reduced rod, that is to say the diameter D3 of the non-threaded portion (6) is substantially equal to diameter flank D8.
Le dispositif de mise en oeuvre du procédé selon l'invention est composé d'un outil de roulage (7) pouvant être du type matrices planes, planétaires ou têtes de roulage (3) à molettes (4). Selon la variante dudit procédé consistant à utiliser des matrices planes à mouvement alternatif, lesdites matrices sont pourvues d'une saillie longitudinale destinée à obtenir la gorge annulaire, ladite saillie présentant un angle (non nul) avec les saillies obliques de pénétration destinées à obtenir le filetage.The device for implementing the method according to the invention is composed of a rolling tool (7) which can be of the flat die type, planetary or rolling heads (3) with rollers (4). According to the variant of said process consisting in using plane dies with reciprocating motion, said dies are provided with a longitudinal projection intended to obtaining the annular groove, said projection having an angle (not zero) with the oblique penetration projections intended to obtain the thread.
Selon une autre variante, l'outil de roulage est du type planétaire et comporte une molette équipée d'un flasque ou disque de roulage de gorge permettant d'effectuer une gorge annulaire de blocage (2) lors de la rotation de ladite molette (4) devant un secteur concave fixe.According to another variant, the rolling tool is of the planetary type and includes a wheel equipped with a flange or rolling disc of groove for performing an annular locking groove (2) during the rotation of said wheel (4) in front of a fixed concave sector.
L'outil de roulage (7) destiné à être utilisé lors du mode de mise en oeuvre préféré du procédé est un outil possédant au moins deux molettes (4a, 4b) montées sur une tête de roulage (3), tel qu'illustré figure 1, ledit outil travaillant en plongée, c'est-à-dire lors d'un procédé de roulage de type radial ou tangentiel. Ledit outil peut, par exemple, comporter trois molettes (4) ou plus, sans pour autant sortir du cadre de l'invention.The rolling tool (7) intended to be used during the setting mode preferred implementation of the method is a tool having at least two wheels (4a, 4b) mounted on a rolling head (3), as illustrated in figure 1, said tool working while diving, that is to say during a process of rolling of the radial or tangential type. Said tool can, for example, include three or more knobs (4), without going beyond the ambit of the invention.
Les molettes (4) de la tête à rouler (3) destinées à mettre en oeuvre le mode préféré du procédé sont de formes cylindriques et comportent sur leur longueur un filetage externe de roulage (8) destiné à réaliser le filetage (5) de la tige (1) en provoquant la formation lors du roulage dudit filetage (5) par déformation de la surface de l'ébauche cylindrique de la tige (1), déformation due à la pénétration des filets dudit filetage externe de roulage (8) dans ladite surface.The rollers (4) of the rolling head (3) intended to set works the preferred mode of the process are cylindrical and have along their length an external rolling thread (8) intended to make the thread (5) of the rod (1) causing the formation during rolling said thread (5) by deformation of the surface of the blank cylindrical of the rod (1), deformation due to the penetration of the threads of said external rolling thread (8) in said surface.
En outre, les molettes (4) possèdent à leurs extrémités (10a, 10b), de manière connue en soi, un chanfrein (11) un angle ou une entrée rayonnée permettant le dégagement de la matière déformée lors du roulage en début et en fin de filet.In addition, the knobs (4) have at their ends (10a, 10b), in a manner known per se, a chamfer (11) an angle or an entry radiated allowing the release of the deformed material during rolling at the start and end of the net.
De plus, lesdites molettes (4) sont munies d'un flasque ou disque de roulage de gorge (12) coaxial fixé à l'une de leurs extrémités (10a, 10b), ladite extrémité (10b) correspondant à celle qui, lors du procédé de roulage permettra le positionnement de la gorge annulaire de blocage (2) entre la partie filetée (5) et la partie non filetée (6) de la tige (1). Ledit disque de roulage de gorge (12) est de diamètre D4 inférieur au diamètre D5 mesuré à fond de filet du filetage externe de roulage (8) de la molette (4). Il possède à son extrémité destinée à être contiguë à la molette (4) une saillie circulaire de roulage (13) dont le sommet (14) est avantageusement arrondi de manière à ce que la gorge annulaire de blocage (2) obtenue grâce à cette saillie (12) possède un fond (15) arrondi, ceci afin d'éviter d'affaiblir la résistance à la traction de la tige (1) à l'endroit de la section transversale contenant ladite gorge (2).In addition, said knobs (4) are provided with a flange or disc. coaxial groove roll (12) fixed at one of their ends (10a, 10b), said end (10b) corresponding to that which, during the process of rolling will allow the positioning of the annular blocking groove (2) between the threaded part (5) and the unthreaded part (6) of the rod (1). said groove rolling disc (12) is of diameter D4 less than the diameter D5 measured at the bottom of the external rolling thread (8) of the thumbwheel (4). It has at its end intended to be contiguous to the wheel (4) a circular rolling projection (13) whose top (14) is advantageously rounded so that the annular groove of blocking (2) obtained by means of this projection (12) has a bottom (15) rounded to avoid weakening the tensile strength of the rod (1) at the location of the cross section containing said groove (2).
De même, pour des raisons similaires, le diamètre externe D6 de la saillie circulaire de roulage (13) est inférieur au diamètre D7 mesuré au sommet de filet du filetage externe de roulage (8) de la molette (4), tel qu'illustré figure 4. De plus, la largeur de ladite saillie circulaire de roulage (13) prise à sa base c'est-à-dire au niveau du diamètre D4 doit être supérieure au pas du filetage externe de roulage (8) et peut avantageusement être égale à une fois et demie ce pas. Le disque de roulage de gorge (12) est donc fixé à la molette (4), tel qu'illustré figures 3 et 4 ; le diamètre de l'extrémité du chanfrein (11) de la molette (4) pouvant avantageusement être égal au diamètre D4 du disque (12) et la saillie de roulage (13) peut être très légèrement décalée par rapport à l'extrémité du disque de roulage (12) destinée à être fixée à la molette (4), de manière à permettre l'obtention d'une fin de filetage (5) nette de la tige filetée (1) devant la gorge annulaire de blocage (2), ainsi que la remontée de matière (16a) entre la gorge (2) et le filetage due à la déformation produite lors de la réalisation de ladite gorge.Likewise, for similar reasons, the outer diameter D6 of the circular rolling projection (13) is less than the diameter D7 measured at top of thread of external rolling thread (8) of thumbwheel (4), as as illustrated in FIG. 4. In addition, the width of said circular rolling projection (13) taken at its base, i.e. at the diameter D4 must be greater than the pitch of the external rolling thread (8) and can advantageously be equal to one and a half times this step. The disc of throat roll (12) is therefore fixed to the wheel (4), as illustrated in FIGS. 3 and 4; the diameter of the end of the chamfer (11) of the wheel (4) can advantageously be equal to the diameter D4 of the disc (12) and the rolling projection (13) can be very slightly offset from the end of the rolling disc (12) intended to be fixed to the wheel (4), so as to obtain a clean end of thread (5) of the threaded rod (1) in front of the annular locking groove (2), as well as the material rising (16a) between the groove (2) and the thread due to the deformation produced during the production of said groove.
La tige filetée (1) obtenue par le procédé selon l'invention grâce à l'utilisation d'un dispositif de mise en oeuvre du type décrit précédemment comprend donc au moins une partie filetée (5) séparée d'une partie non filetée (6) par une gorge annulaire de blocage (2). Elle peut être du type goujon à tige réduite, tel qu'illustré figures 5, 6, 7, et posséder deux parties filetées (5a, 5b), entourant une partie non filetée (6) dont le diamètre est égal au diamètre à flanc de filet desdites parties filetées (5a, 5b). Lesdites parties filetées (5a, 5b) pouvant être de longueur différente, la gorge annulaire de blocage (2) est positionnée entre l'une desdites parties filetées (5a) généralement la plus courte appelée côté d'implantation du goujon, et la partie non filetée (6). The threaded rod (1) obtained by the method according to the invention thanks to the use of an implementation device of the type described previously therefore therefore comprises at least one separate threaded part (5) a non-threaded part (6) by an annular locking groove (2). She may be of the reduced rod stud type, as illustrated in FIGS. 5, 6, 7, and have two threaded parts (5a, 5b), surrounding a non-threaded part (6) the diameter of which is equal to the flank diameter of said parts threaded (5a, 5b). Said threaded parts (5a, 5b) may be of length different, the annular locking groove (2) is positioned between one of said threaded parts (5a) generally the shortest called side of implantation of the stud, and the non-threaded part (6).
De plus, il peut être avantageux de réaliser un goujon à tige réduite (1) dont la partie centrale non filetée (6) est de très faible longueur, la partie filetée (5b) s'arrêtant à proximité de la gorge de blocage (2), les filets (5b) servant alors de guides pour la ou les pièce(s) à maintenir.In addition, it may be advantageous to produce a stud bolt reduced (1) whose non-threaded central part (6) is very small length, the threaded part (5b) stopping near the groove blocking (2), the threads (5b) then serving as guides for the part (s) to maintain.
De plus, on peut également réaliser, grâce au procédé, un goujon possédant deux gorges annulaires de blocage (2), une à chaque extrémité de la partie non filetée (6) centrale, sans pour autant sortir du champ de l'invention. Les extrémités des tiges filetées (1), goujons, tirants ou bouts filetés obtenues par le procédé peuvent être soit chanfreinées, soit brutes de roulage, soit bombées ou à bout plat, ou de tout autre type possible. De même, la forme des filets peut être diverse : triangulaire ou trapézoïdale, par exemple.In addition, it is also possible, thanks to the process, to produce a stud having two annular locking grooves (2), one at each end of the central unthreaded part (6), without however leaving the field of the invention. The ends of the threaded rods (1), studs, tie rods or ends threads obtained by the process can be either chamfered or rough of rolling, either curved or with a flat end, or of any other possible type. Similarly, the shape of the nets can be diverse: triangular or trapezoid, for example.
La tige, goujon ou tirant, filetée (1) selon le procédé de roulage décrit précédemment possède donc au moins une gorge annulaire de blocage (2) dont le diamètre en fond de gorge D1 est supérieur au diamètre en fond de filet D2 et de largeur supérieure au pas de sa partie filetée, avantageusement égale à une fois et demie la valeur du pas. Le fond (15) de la gorge annulaire de blocage (2) est arrondi de manière à diminuer les risques de rupture en traction au niveau de ladite gorge annulaire (2).The rod, stud or tie rod, threaded (1) according to the rolling process described above therefore has at least one annular groove of blocking (2) whose diameter at the bottom of the groove D1 is greater than diameter at the bottom of the thread D2 and of width greater than the pitch of its part threaded, advantageously equal to one and a half times the value of the step. The bottom (15) of the annular locking groove (2) is rounded so as to reduce the risk of rupture in traction at the level of said groove annular (2).
Par ailleurs, il est important de noter que le diamètre D9 de la remontée de matière (16a) produite lors du roulage et située entre la gorge (2) et la partie filetée (5) est inférieur au diamètre en sommet de filet D10 de ladite partie filetée. De plus, le roulage de la gorge de blocage (2) provoque également une remontée de matière (16b) de diamètre D11 entre la gorge (2) et la partie non filetée (6). Le diamètre D11 de ladite remontée de matière (16b) est inférieur au diamètre en sommet de filet D10 et est avantageusement sensiblement égal au diamètre D9 de l'autre remontée (16a). Selon l'invention, une telle gorge de blocage (2) peut être obtenu par le procédé décrit précédemment quelque soit les caractéristiques propres de la tige filetée telles que le diamètre nominal, le pas du filetage, le profil du filet ou la tolérance. Furthermore, it is important to note that the diameter D9 of the rise of material (16a) produced during rolling and located between the groove (2) and the threaded part (5) is less than the diameter at the top of thread D10 of said threaded part. In addition, the rolling of the throat of blocking (2) also causes a material rise (16b) of diameter D11 between the groove (2) and the non-threaded part (6). The diameter D11 of said material rise (16b) is less than the diameter in top of thread D10 and is advantageously substantially equal to diameter D9 of the other lift (16a). According to the invention, such a groove blocking (2) can be obtained by the method described above whatever the specific characteristics of the threaded rod such as the nominal diameter, thread pitch, thread profile or tolerance.
Il va de soi que le procédé décrit et illustré dans le cas d'un roulage de filet effectué par une tête à rouler du type lamineur n'exclut aucunement de la protection des procédés équivalents utilisant d'autres types de machines à rouler permettant les réalisations de filetage et de gorge de blocage par déformation.It goes without saying that the process described and illustrated in the case of a thread rolling carried out by a rolling head of the laminator type does not exclude no protection of equivalent processes using other types of rolling machines enabling threading and deformation blocking groove.
Claims (8)
- Process for producing a rod (1) having at least one screw thread (S), produced by deformation, characterised in that it comprises producing an annular blocking groove (2) by deformation, said blocking groove having a diameter at the base of the groove (D1) which is greater than the diameter at the base of the thread (D2).
- Process according to claim 1, characterised in that the thread (5) and the annular blocking groove (2) are produced simultaneously.
- Process according to any one of the preceding claims, characterised in that the process is a process of rolling the threads.
- Process according to any one of the preceding claims, characterised in that it comprises producing said annular blocking groove (2) so that it is positioned between the thread (5) of the rod (1) and its non-threaded portion (6).
- Rolling tool (7) intended for carrying out the process according to claim 3, comprising at least one cutter wheel (4) having along its length an external rolling thread and provided at one end (10a, 10b) with a groove rolling disc (12), characterised in that said groove rolling disc has a circular rolling projection, and the outer diameter of said projection is less than the diameter measured at the top of the external rolling thread.
- Tool (7) according to claim 5, characterised in that said groove rolling disc (12) has a circular rolling projection (13) which is rounded at its top (14).
- Pin with a reduced rod obtained by the process according to any one of claims 1 to 4, characterised in that the annular blocking groove (2) is located between the threaded portion (5a, 5b) and the central non-threaded portion (6), while the diameter measured at the base of the groove is greater than the diameter measured at the base of the thread.
- Threaded rod, tie rod or pin (1) obtained by the process according to any one of claims 1 to 4, characterised in that two raised areas of material (16a, 16b) are located on each side of the blocking groove (2), the respective diameters D9 and D11 of said raised areas of material being less than the diameter, measured at the top of the thread D10, of the threaded portion (5, 5a, 5b), while the diameter measured at the base of the groove is greater than the diameter measured at the base of the thread.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9603770 | 1996-03-19 | ||
| FR9603770A FR2746331B1 (en) | 1996-03-19 | 1996-03-19 | IMPROVEMENT FOR PROCESS FOR PRODUCING THREADED STUDS OR DRAWERS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0796680A1 EP0796680A1 (en) | 1997-09-24 |
| EP0796680B1 true EP0796680B1 (en) | 2002-10-02 |
Family
ID=9490569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97410029A Expired - Lifetime EP0796680B1 (en) | 1996-03-19 | 1997-03-11 | Method for the manufacture of screw bolts or threaded tie bars |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0796680B1 (en) |
| AT (1) | ATE225220T1 (en) |
| DE (1) | DE69715944T2 (en) |
| DK (1) | DK0796680T3 (en) |
| ES (1) | ES2184975T3 (en) |
| FR (1) | FR2746331B1 (en) |
| PT (1) | PT796680E (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007062437A1 (en) | 2007-12-20 | 2009-10-08 | Profiroll Technologies Gmbh | Rolling tool for cold-rolling profiled roller of actuation device, has cylindrical/cone shaped ring passage arranged as supporting section between threaded profiles and profile sections |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028683B (en) * | 2012-12-27 | 2015-04-08 | 金湖县常盛动力机械配件有限公司 | Processing method for clamp spring slot of roller pin and cutter device thereof |
| FR3009218B1 (en) | 2013-07-31 | 2016-01-01 | Decorec | SCREW WITH CLOSING TORQUE LIMIT |
| US11761489B2 (en) | 2019-06-14 | 2023-09-19 | Gkn Driveline Deutschland Gmbh | Gear-tooth system and shaft/hub connection component |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE451597A (en) * | 1942-01-05 | |||
| DE954865C (en) * | 1954-06-25 | 1956-12-27 | Teves Kg Alfred | Method for producing a screw-in end limited by a collar on a cylindrical part |
| JPS5897453A (en) * | 1981-12-03 | 1983-06-09 | Satake Tekko Kk | Manufacture of separator for concrete frame |
| JPH03161136A (en) * | 1989-11-14 | 1991-07-11 | Shinjiyou Seisakusho:Kk | Manufacture of anchor bolt for concrete and its device for manufacture of anchor bolt |
| DE4024563A1 (en) * | 1990-08-02 | 1992-02-06 | Itw Ateco Gmbh | Round-headed screw mfr. with thread and stop - starts with cylindrical pin from which head and shank are pref. cold-rolled before thread cutting |
| JP2643574B2 (en) * | 1990-10-03 | 1997-08-20 | トヨタ自動車株式会社 | Manufacturing method of tension bolt |
-
1996
- 1996-03-19 FR FR9603770A patent/FR2746331B1/en not_active Expired - Lifetime
-
1997
- 1997-03-11 EP EP97410029A patent/EP0796680B1/en not_active Expired - Lifetime
- 1997-03-11 AT AT97410029T patent/ATE225220T1/en active
- 1997-03-11 DE DE69715944T patent/DE69715944T2/en not_active Expired - Lifetime
- 1997-03-11 DK DK97410029T patent/DK0796680T3/en active
- 1997-03-11 PT PT97410029T patent/PT796680E/en unknown
- 1997-03-11 ES ES97410029T patent/ES2184975T3/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007062437A1 (en) | 2007-12-20 | 2009-10-08 | Profiroll Technologies Gmbh | Rolling tool for cold-rolling profiled roller of actuation device, has cylindrical/cone shaped ring passage arranged as supporting section between threaded profiles and profile sections |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2746331A1 (en) | 1997-09-26 |
| PT796680E (en) | 2003-02-28 |
| EP0796680A1 (en) | 1997-09-24 |
| FR2746331B1 (en) | 1998-05-15 |
| ES2184975T3 (en) | 2003-04-16 |
| ATE225220T1 (en) | 2002-10-15 |
| DE69715944D1 (en) | 2002-11-07 |
| DE69715944T2 (en) | 2003-08-28 |
| DK0796680T3 (en) | 2003-02-10 |
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