EP1186360B1 - Method and device for the manufacture of screw elements - Google Patents

Method and device for the manufacture of screw elements Download PDF

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Publication number
EP1186360B1
EP1186360B1 EP01117159A EP01117159A EP1186360B1 EP 1186360 B1 EP1186360 B1 EP 1186360B1 EP 01117159 A EP01117159 A EP 01117159A EP 01117159 A EP01117159 A EP 01117159A EP 1186360 B1 EP1186360 B1 EP 1186360B1
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EP
European Patent Office
Prior art keywords
rolling
reducing surface
roller
pair
reduced
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EP01117159A
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German (de)
French (fr)
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EP1186360A2 (en
EP1186360A3 (en
Inventor
Andreas Wunderlich
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Reisser Schraubentechnik GmbH
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Reisser Schraubentechnik GmbH
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Priority to DK01117159T priority Critical patent/DK1186360T3/en
Publication of EP1186360A2 publication Critical patent/EP1186360A2/en
Publication of EP1186360A3 publication Critical patent/EP1186360A3/en
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Publication of EP1186360B1 publication Critical patent/EP1186360B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21HMAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00Making helical bodies or bodies having parts of helical shape
    • B21H3/02Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/027Rolling of self-tapping screws

Definitions

  • the invention relates to a method for producing a bolt element according to the preamble of claim 1 and a rolling die pair after the The preamble of claim 10.
  • a method and such Rolling die pair are known from EP A 0 428 317.
  • a trilobular screw is known (US-A-5242253), in which at the end remote from the screw head of the screw a cylindrical Section is formed with a thread.
  • the invention is based on the object to a possibility create, bolt elements of this kind cheaper and with produce less equipment.
  • the invention proposes a method with the Features of claim 1 and a rolling die pair with the Features of claim 10 before. Further developments of the invention are The subject - matter of the dependent claims, the wording thereof as well as the Text of the abstract by reference to the content of Description is made.
  • the bolt can be with produce less equipment and time.
  • the material of the wire pin is displaced.
  • the invention now proposes to perform the reducing, that the displacement of this material gradually towards the free end of the bolt element takes place. If a screw would So the material displaced in the direction of the screw tip.
  • the invention proposes that with increasing rollers, the axial Length of the reduced section is extended. It will be at the beginning Therefore, the rolling process only a very small area in his Diameter reduced, and this area will gradually increased.
  • the Wire pin is rolled using two dies, of which at least one projecting from the rolling surface Reduction surface has.
  • This raised reduction surface serves to reduce the distance between the two dies, so that here a section with reduced diameter is rolled.
  • the Reduced reduction area in rolling device This should be stated be that the measured transverse to the rolling direction width with progressing rolling direction becomes larger. This serves the area reduced diameter axially as the rolling progresses extend.
  • the reduction surface starts very narrow, so that at the beginning of the Rolling the reduced area does not jerk too big forces occur.
  • the free end of the wire pin associated edge of the reduction runs obliquely opposite to the rolling direction. This can be taken care of be that the displacement of the excess material only in one Direction is performed, so the free end of the wire pin out.
  • the height of the reduction surface may, for example, increase be formed so that with increasing rolling not only the Diameter is gradually reduced, but also the axial length this area is enlarged. It may also be provided be that the height of the reduction surface is constant.
  • the invention can be used in particular for the production of screws be used, in which the wire pin before rolling with a Head is provided. Such a head can also be used for other things Bolt elements are attached.
  • the invention also proposes a rolling die pair with the features of claim 10 before. At least one of the two dies contains a Reduzier Structure, which raised relative to the other rolling surface is formed, so that here with correctly arranged pair of rolling dies the distance is reduced.
  • the reduction surface has a smooth surface.
  • the Reduction surface is designed such that their transversely to Rolling mill measured width seen in rolling device increases, the reduction so widened in rolling device.
  • the Reduction area starts narrow and then in rolling mill then widened to their desired length.
  • the reducing surface comprising part of the rolling die is removably formed to the Rolling dies also reduced for bolt elements without a section Diameter suitable to use. This is also the case Possibility to adjust the reduction diameter.
  • the reducing surface only over part of the extension of the rolling dies in the rolling apparatus extends.
  • FIG. 1 shows in perspective a rolling jaw of a rolling die pair.
  • the second rolling jaw would look similar and would be above this Rolling jaw be arranged.
  • the rolling die contains a rolling surface 2, in working condition of the rolling die pair of the other rolling die is facing.
  • On this rolling surface 2 are oblique to the longitudinal direction extending sharp-edged ribs 3 are formed with which a thread is rolled.
  • the formation of the rolling jaw is known.
  • the Wire pin is placed on the front left of the die and along the Rolled surface 2 rolled to the right rear. The rolling direction thus runs from left front to right rear and is indicated by the arrow 4.
  • the axial direction of the wire pin to be processed is perpendicular to this direction and parallel to the rolling surface 2, so in the figure left to right.
  • the wire pin is oriented so that free end pointing to the right.
  • the free end is the end of the Wire pin, which is remote from the head, in a screw so the Screw tip.
  • the area of reduced diameter is the Screw tip facing while the area of not reduced diameter facing the screw head.
  • This reduction surface 6 is an increase on the component 5 educated. It starts with a very narrow starting area 7, immediately after the beginning of the rolling die. Of this Beginning region 7 of the reduction area 6 widened, the Width means the extension transverse to the rolling device, ie transversely to the arrow 4. The broadening is designed so that the free End of the wire pin associated edge 8 of the reduction 6 inclined runs, while the head facing edge 9 of the reduction 6 runs in the rolling direction.
  • the length of the reduction surface 6 in the rolling direction is about one third of the longitudinal extent of the rolling die 1.
  • Die Reduction surface itself is flat and parallel to the rolling surface 2 is formed.
  • a strip area 10 Close to the rear end of the reducing 6 in rolling device a strip area 10, in which a ribbing is formed. With the help of this ribbing can in the area of the bolt element with reduced diameter rolled a coarse thread.
  • FIG. 2 shows, as already mentioned, a schematic cross section through a rolling die pair. It can be seen here that the each other facing surfaces of both rolling dies each have a Reduzier Chemistry. 6 exhibit. The edges 8 associated with the free end of the wire pin both reduction surfaces 6 form an inclined shoulder.
  • FIG 3 shows an example of a bolt element, which with a Rolling jaw according to the invention by the method according to the invention can be produced.
  • the bolt element in the example shown a screw, includes a first shaft portion 11 with a first Diameter, to which a second shaft portion 12 with a reduced diameter connects.
  • the free end of the screw forms a screw tip 13 which is cone-shaped.
  • On the Shank portion 11 is rolled a conventional screw thread, while in the screw portion 12, a coarse thread 14 is rolled is.
  • the actual screw tip contains in the embodiment 3 also still the coarse thread 14, while in the similar Embodiment of Figure 4 here is a continuation of the usual Screw thread is present.
  • the upper part is rolled, the lower part is reduced.
  • the angle of Reduzierbarke can thereby approx 20 ° instead of 6 ° to 10 °, as known in the art is.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Metal Rolling (AREA)
  • Metal Extraction Processes (AREA)

Abstract

The bold element is produced starting from a measured-out cylindrical wire pin, the front sector of which is reduced in diameter by a rolling process. For a threaded bolt or screw, the reduction and thread-rolling can be done in a single process using a single roll jaw pair (1) with a reducing surface (6) by which the diameter reduction is accomplished.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Bolzenelements nach dem Oberbegriff des Anspruchs 1 und ein Walzbackenpaar nach dem Oberbegriff des Anspruchs 10. Ein solches Verfahren und ein solches Walzbackenpaar sind aus EP A 0 428 317 bekannt.The invention relates to a method for producing a bolt element according to the preamble of claim 1 and a rolling die pair after the The preamble of claim 10. Such a method and such Rolling die pair are known from EP A 0 428 317.

Es sind Bolzenelemente bekannt, beispielsweise Schrauben, die zwei Abschnitte unterschiedlichen Durchmessers aufweisen. Auf diese Abschnitte werden dann gegebenenfalls Gewinde aufgewalzt. Beispielsweise gibt es Schrauben, die in einem der Schraubenspitze zugewandten Bereich ein Gewinde mit einem geringeren Außendurchmesser aufweisen als im restlichen Teil des Schraubenschaftes.There are known bolt elements, such as screws, the two Have sections of different diameters. To this Sections are then optionally rolled thread. For example, there are screws in one of the screw tip facing area a thread with a smaller Have outer diameter than in the remaining part of Screw shank.

Bisher werden diese Bolzenelemente dadurch hergestellt, dass zunächst durch Fließpressen ein Drahtstift mit zwei glatten zylindrischen Bereichen hergestellt wird. Das Drahtstück wird in eine Matrize mit einer Stufenbohrung eingepresst, so dass sich der vordere Bereich durch Fließpressen auf einen geringeren Durchmesser reduziert. Das Einpressen in die Form und gleichzeitige Aufstauchen des Kopfes bei Schrauben oder Bolzen geschieht gegen einen Anschlag, der anschließend zum Auswerfen verwendet wird. Diese Auswerfernadel ist wegen des vorher erfolgten Pressens hohen Belastungen ausgesetzt. Außerdem muß die Auswerfernadel dünner sein als bei glattgepressten Rohlingen. Daher kommt es relativ häufigen zum Brechen der Nadel. Bei Änderung der Länge des Drahtstiftes wird bei reduzierten Rohlingen ein Werkzeugwechsel notwendig. Bei glatten Rohlingen wird nur die Anschlaglänge und damit die Position verstellt. Darüber hinaus lässt sich das Fließpressen aufgrund des hohen Widerstandes nur mit relativ langsamer Geschwindigkeit durchführen.So far, these bolt elements are made by that First, by extrusion, a wire pin with two smooth cylindrical Areas is produced. The piece of wire is placed in a die with a Step hole pressed, so that the front area through Extrusion reduced to a smaller diameter. The Pressing into the mold and simultaneous upsetting of the head at Screws or bolts happen against a stop that then used for ejection. This ejection needle is exposed to high loads due to the previous pressing. In addition, the Auswerfernadel must be thinner than when pressed smooth Blanks. Therefore, it is relatively common to break the needle. When changing the length of the wire pin is at reduced blanks a tool change necessary. With smooth blanks only the Stop length and thus the position adjusted. In addition, it can be the extrusion due to the high resistance only with relative slow speed.

Es ist bereits ein Verfahren und eine Vorrichtung zum Herstellen eines Schraubbolzens mit zwei Abschnitten unterschiedlichen Durchmessers bekannt (EP A2 0428317). Der Abschnitt verringerten Durchmessers hat kein Gewinde und befindet sich am kopfseitigen Ende des Bolzens.It is already a method and an apparatus for producing a Bolt with two sections of different diameters known (EP A2 0428317). The section of reduced diameter has no thread and located at the head end of the bolt.

Weiterhin ist eine trilobulare Schraube bekannt (US-A-5242253), bei der an dem dem Schraubenkopf abgewandten Ende der Schraube ein zylindrischer Abschnitt mit einem Gewinde gebildet ist.Furthermore, a trilobular screw is known (US-A-5242253), in which at the end remote from the screw head of the screw a cylindrical Section is formed with a thread.

Weiterhin bekannt ist ein Verfahren und eine Vorrichtung zum spanlosen Reduzieren von insbesondere warmverformten Rohschrauben durch Walzen (DD -335611).Also known is a method and a device for chipless Reduction of especially hot-formed raw screws Rolls (DD -335611).

Der Erfindung liegt die Aufgabe zu Grunde, eine Möglichkeit zu schaffen, Bolzenelemente dieser Art kostengünstiger und mit geringerem apparativen Aufwand herzustellen.The invention is based on the object to a possibility create, bolt elements of this kind cheaper and with produce less equipment.

Zur Lösung dieser Aufgabe schlägt die Erfindung ein Verfahren mit den Merkmalen des Anspruchs 1 sowie ein Walzbackenpaar mit den Merkmalen des Anspruchs 10 vor. Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche, deren Wortlaut ebenso wie der Wortlaut der Zusammenfassung durch Bezugnahme zum Inhalt der Beschreibung gemacht wird.To solve this problem, the invention proposes a method with the Features of claim 1 and a rolling die pair with the Features of claim 10 before. Further developments of the invention are The subject - matter of the dependent claims, the wording thereof as well as the Text of the abstract by reference to the content of Description is made.

Durch das Reduzieren des Durchmessers des Drahtstifts beim Walzen selbst wird der bislang erforderliche zeitaufwendige Arbeitsschritt des Reduzierens beim Pressens vermieden. Der Bolzen lässt sich mit geringerem apparativen und zeitlichen Aufwand herstellen.By reducing the diameter of the wire pin during rolling itself becomes the so far required time consuming step of the Reduced while pressing avoided. The bolt can be with produce less equipment and time.

Beim Walzen des Drahtstifts in dem entsprechenden Bereich auf den verringerten Durchmesser wird das Material des Drahtstifts verdrängt. Hier schlägt die Erfindung nun vor, das Reduzieren so durchzuführen, dass die Verdrängung dieses Materials nach und nach in Richtung auf das freie Ende des Bolzenelements erfolgt. Bei einer Schraube würde das Material also in Richtung auf die Schraubenspitze verdrängt. When rolling the wire pin in the appropriate area on the reduced diameter, the material of the wire pin is displaced. Here, the invention now proposes to perform the reducing, that the displacement of this material gradually towards the free end of the bolt element takes place. If a screw would So the material displaced in the direction of the screw tip.

Um das Verdrängen schonender durchzuführen, wird in Weiterbildung der Erfindung vorgeschlagen, dass mit zunehmendem Walzen die axiale Länge des reduzierten Abschnitts verlängert wird. Es wird bei Beginn des Walzvorgangs daher nur ein sehr kleiner Bereich in seinem Durchmesser reduziert, und dieser Bereich wird nach und nach vergrößert.In order to perform the repression gentler, is in training The invention proposes that with increasing rollers, the axial Length of the reduced section is extended. It will be at the beginning Therefore, the rolling process only a very small area in his Diameter reduced, and this area will gradually increased.

In Weiterbildung der Erfindung kann vorgesehen sein, dass der Drahtstift mit Hilfe zweier Walzbacken gewalzt wird, von denen mindestens eine eine gegenüber der Walzfläche vorspringende Reduzierfläche aufweist. Diese erhabene Reduzierfläche dient dazu, den Abstand zwischen den beiden Walzbacken zu verringern, so dass hier ein Abschnitt mit reduziertem Durchmesser gewalzt wird.In a further development of the invention can be provided that the Wire pin is rolled using two dies, of which at least one projecting from the rolling surface Reduction surface has. This raised reduction surface serves to reduce the distance between the two dies, so that here a section with reduced diameter is rolled.

In Weiterbildung der Erfindung kann vorgesehen sein, dass sich die Reduzierfläche in Walzvorrichtung verbreitert. Damit soll ausgesagt werden, dass die quer zur Walzrichtung gemessene Breite mit fortschreitender Walzrichtung größer wird. Dies dient dazu, den Bereich reduzierten Durchmessers mit fortschreitendem Walzen axial zu verlängern.In a further development of the invention can be provided that the Reduced reduction area in rolling device. This should be stated be that the measured transverse to the rolling direction width with progressing rolling direction becomes larger. This serves the area reduced diameter axially as the rolling progresses extend.

Insbesondere kann in Weiterbildung der Erfindung vorgesehen sein, dass die Reduzierfläche sehr schmal beginnt, so dass beim Beginn des Walzens des reduzierten Bereichs keine zu großen Kräfte ruckartig auftreten.In particular, it can be provided in development of the invention, that the reduction surface starts very narrow, so that at the beginning of the Rolling the reduced area does not jerk too big forces occur.

In Weiterbildung der Erfindung kann vorgesehen sein, dass der dem freien Ende des Drahtstifts zugeordnete Rand der Reduzierfläche schräg gegenüber der Walzrichtung verläuft. Damit kann dafür gesorgt werden, dass die Verdrängung des überschüssigen Materials nur in eine Richtung durchgeführt wird, also zum freien Ende des Drahtstifts hin. In a further development of the invention can be provided that the the free end of the wire pin associated edge of the reduction runs obliquely opposite to the rolling direction. This can be taken care of be that the displacement of the excess material only in one Direction is performed, so the free end of the wire pin out.

Die Höhe der Reduzierfläche kann beispielsweise ansteigend ausgebildet sein, so dass mit zunehmendem Walzen nicht nur der Durchmesser allmählich vermindert wird, sondern auch die axiale Länge dieses Bereichs vergrößert wird. Es kann aber ebenfalls vorgesehen sein, dass die Höhe der Reduzierfläche konstant ist.The height of the reduction surface may, for example, increase be formed so that with increasing rolling not only the Diameter is gradually reduced, but also the axial length this area is enlarged. It may also be provided be that the height of the reduction surface is constant.

Die Erfindung kann insbesondere zur Herstellung von Schrauben verwendet werden, bei denen der Drahtstift vor dem Walzen mit einem Kopf versehen wird. Ein solcher Kopf kann auch bei sonstigen Bolzenelementen angebracht werden.The invention can be used in particular for the production of screws be used, in which the wire pin before rolling with a Head is provided. Such a head can also be used for other things Bolt elements are attached.

Die Erfindung schlägt ebenfalls ein Walzbackenpaar mit den Merkmalen des Anspruchs 10 vor. Mindestens eine der beiden Walzbacken enthält eine Reduzierfläche, die gegenüber der sonstigen Walzfläche erhaben ausgebildet ist, so dass hier bei korrekt angeordnetem Walzbackenpaar der Abstand verringert ist. The invention also proposes a rolling die pair with the features of claim 10 before. At least one of the two dies contains a Reduzierfläche, which raised relative to the other rolling surface is formed, so that here with correctly arranged pair of rolling dies the distance is reduced.

Insbesondere kann in Weiterbildung der Erfindung vorgesehen sein, dass die Reduzierfläche eine glatte Oberfläche aufweist.In particular, it can be provided in development of the invention, the reduction surface has a smooth surface.

In Weiterbildung der Erfindung kann vorgesehen sein, dass die Reduzierfläche derart ausgebildet ist, dass ihre quer zur Walzvorrichtung gemessene Breite in Walzvorrichtung gesehen zunimmt, die Reduzierfläche sich also in Walzvorrichtung verbreitert.In a further development of the invention can be provided that the Reduction surface is designed such that their transversely to Rolling mill measured width seen in rolling device increases, the reduction so widened in rolling device.

Um die Belastung der Walzvorrichtung und der Walzbacken klein zu halten, kann erfindungsgemäß vorgesehen sein, dass die Reduzierfläche schmal beginnt und sich erst in Walzvorrichtung dann auf ihre gewünschte Länge verbreitert.To the load of the rolling device and the dies to small hold, can be provided according to the invention that the Reduction area starts narrow and then in rolling mill then widened to their desired length.

Erfindungsgemäß kann vorgesehen sein, dass der die Reduzierfläche aufweisende Teil des Walzbackens abnehmbar ausgebildet ist, um den Walzbacken auch für Bolzenelemente ohne einen Abschnitt verringerten Durchmessers verwendbar zu gestalten. Dadurch ist auch die Möglichkeit gegeben, den Reduktionsdurchmesser einzustellen.According to the invention, it may be provided that the reducing surface comprising part of the rolling die is removably formed to the Rolling dies also reduced for bolt elements without a section Diameter suitable to use. This is also the case Possibility to adjust the reduction diameter.

Erfindungsgemäß kann vorgesehen sein, dass sich die Reduzierfläche nur über einen Teil der Erstreckung der Walzbacken in Walzvorrichtung erstreckt.According to the invention, it may be provided that the reducing surface only over part of the extension of the rolling dies in the rolling apparatus extends.

Weitere Merkmale, Einzelheiten und Vorzüge der Erfindung ergeben sich aus der folgenden Beschreibung einer bevorzugten Ausführungsform der Erfindung sowie an Hand der Zeichnung. Hierbei zeigen:

  • Fig. 1 eine perspektivische Ansicht eines Walzbackens zur Durchführung des von der Erfindung vorgeschlagenen Verfahrens;
  • Fig. 2 einen vereinfachten Querschnitt durch ein Walzbackenpaar im Bereich der Reduzierfläche;
  • Fig. 3 ein Beispiel einer nach dem Verfahren herstellbaren Schraube;
  • Fig. 4 eine der Figur 3 entsprechende Darstellung einer weiteren Schraube.
  • Further features, details and advantages of the invention will become apparent from the following description of a preferred embodiment of the invention and with reference to the drawing. Hereby show:
  • Fig. 1 is a perspective view of a rolling die for carrying out the method proposed by the invention;
  • 2 shows a simplified cross section through a pair of rolling dies in the region of the reduction surface;
  • 3 shows an example of a screw which can be produced by the method;
  • Fig. 4 is a representation corresponding to Figure 3 of another screw.
  • Figur 1 zeigt perspektivisch eine Walzbacke eines Walzbackenpaars. Die zweite Walzbacke sähe ähnlich aus und würde oberhalb dieser Walzbacke angeordnet sein. Die Walzbacke enthält eine Walzfläche 2, die in Arbeitszustand des Walzbackenpaares der anderen Walzbacke zugewandt ist. Auf dieser Walzfläche 2 sind schräg zur Längsrichtung verlaufende scharfkantige Rippen 3 ausgebildet, mit denen ein Gewinde gewalzt wird. Insoweit ist die Ausbildung der Walzbacke bekannt. Die Längsrichtung die Walzbacke 1, in Figur 1 von links vorne nach rechts hinten gesehen, stellt die Bewegungsrichtung der Walzbacke 1 dar. Der Drahtstift wird vorne links auf die Walzbacke aufgelegt und längs der Walzfläche 2 nach rechts hinten gewalzt. Die Walzrichtung verläuft also von links vorne nach rechts hinten und wird durch den Pfeil 4 angezeigt. Die axiale Richtung des zu bearbeitenden Drahtstifts verläuft senkrecht zu dieser Richtung und parallel zu der Walzfläche 2, also in der Figur von links nach rechts. Dabei ist der Drahtstift so orientiert, dass sein freies Ende nach rechts zeigt. Das freie Ende ist dasjenige Ende des Drahtstifts, das dem Kopf abgewandt ist, bei einer Schraube also die Schraubenspitze. Der Bereich verringerten Durchmessers ist der Schraubenspitze zugewandt, während der Bereich des nicht verringerten Durchmessers dem Schraubenkopf zugewandt ist. FIG. 1 shows in perspective a rolling jaw of a rolling die pair. The second rolling jaw would look similar and would be above this Rolling jaw be arranged. The rolling die contains a rolling surface 2, in working condition of the rolling die pair of the other rolling die is facing. On this rolling surface 2 are oblique to the longitudinal direction extending sharp-edged ribs 3 are formed with which a thread is rolled. In that regard, the formation of the rolling jaw is known. The In the longitudinal direction of the rolling jaw 1, in Figure 1 from left to front to the right seen back, the direction of movement of the rolling jaw 1 represents. The Wire pin is placed on the front left of the die and along the Rolled surface 2 rolled to the right rear. The rolling direction thus runs from left front to right rear and is indicated by the arrow 4. The axial direction of the wire pin to be processed is perpendicular to this direction and parallel to the rolling surface 2, so in the figure left to right. In this case, the wire pin is oriented so that free end pointing to the right. The free end is the end of the Wire pin, which is remote from the head, in a screw so the Screw tip. The area of reduced diameter is the Screw tip facing while the area of not reduced diameter facing the screw head.

    An der dem freien Ende des Drahtstifts zugewandten Seite der Walzbacke und an der dem Beginn der Walzbearbeitung zugeordneten Ende der Walzbacke, in Figur 1 also vorne rechts, ist ein quaderförmiges Bauteil 5 in die Walzbacke eingesetzt, das auf seiner der anderen Walzbacke zugeordneten Seite eine Reduzierfläche 6 aufweist. Die Reduzierfläche 6 ist gegenüber der Arbeitsfläche 2 erhaben ausgebildet. Bei zusammengesetztem Walzbackenpaar ist also an dieser Stelle ein geringerer Abstand zwischen den beiden Walzbacken vorhanden, siehe die stark schematisierte Darstellung in Figur 2.At the free end of the wire pin side facing the Rolling jaw and at the beginning of the rolling processing associated End of the rolling die, in Figure 1 so the front right, is a cuboidal component 5 inserted into the rolling die, which on its the other rolling jaw associated side a reduction 6th having. The reduction surface 6 is opposite the working surface 2 sublime trained. When composite rolling die pair is so At this point, a smaller distance between the two Rolling jaws present, see the highly schematic representation in FIG. 2.

    Diese Reduzierfläche 6 wird von einer Erhöhung auf dem Bau- teil 5 gebildet. Sie beginnt mit einem sehr schmalen Anfangsbereich 7, unmittelbar nach dem Anfang der Walzbacke. Von diesem Anfangsbereich 7 aus verbreitert sich die Reduzierfläche 6, wobei die Breite die Erstreckung quer zur Walzvorrichtung bedeutet, also quer zum dem Pfeil 4. Die Verbreiterung ist so gestaltet, dass der dem freien Ende des Drahtstifts zugeordnete Rand 8 der Reduzierfläche 6 schräg verläuft, während der dem Kopf zugewandte Rand 9 der Reduzierfläche 6 in Walzrichtung verläuft.This reduction surface 6 is an increase on the component 5 educated. It starts with a very narrow starting area 7, immediately after the beginning of the rolling die. Of this Beginning region 7 of the reduction area 6 widened, the Width means the extension transverse to the rolling device, ie transversely to the arrow 4. The broadening is designed so that the free End of the wire pin associated edge 8 of the reduction 6 inclined runs, while the head facing edge 9 of the reduction 6 runs in the rolling direction.

    Die Länge der Reduzierfläche 6 in Walzrichtung, siehe den Pfeil 4, beträgt etwa ein Drittel der Längserstreckung die Walzbacke 1. Die Reduzierfläche selbst ist eben und parallel zur Walzfläche 2 ausgebildet. An das in Walzvorrichtung hintere Ende der Reduzierfläche 6 schließt sich ein Streifenbereich 10 an, in dem eine Verrippung ausgebildet ist. Mit Hilfe dieser Verrippung kann in den Bereich des Bolzenelements mit verringertem Durchmesser ein Steilgewinde eingewalzt werden.The length of the reduction surface 6 in the rolling direction, see the arrow 4, is about one third of the longitudinal extent of the rolling die 1. Die Reduction surface itself is flat and parallel to the rolling surface 2 is formed. Close to the rear end of the reducing 6 in rolling device a strip area 10, in which a ribbing is formed. With the help of this ribbing can in the area of the bolt element with reduced diameter rolled a coarse thread.

    Figur 2 zeigt, wie bereits erwähnt, einen schematischen Querschnitt durch ein Walzbackenpaar. Es ist hier zu sehen, dass die einander zugewandten Flächen beider Walzbacken jeweils eine Reduzierfläche 6 aufweisen. Die dem freien Ende des Drahtstifts zugeordneten Ränder 8 beider Reduzierflächen 6 bilden eine schräg verlaufende Schulter.FIG. 2 shows, as already mentioned, a schematic cross section through a rolling die pair. It can be seen here that the each other facing surfaces of both rolling dies each have a Reduzierfläche. 6 exhibit. The edges 8 associated with the free end of the wire pin both reduction surfaces 6 form an inclined shoulder.

    Figur 3 zeigt ein Beispiel für ein Bolzenelement, das mit einer Walzbacke nach der Erfindung durch das erfindungsgemäße Verfahren hergestellt werden kann. Das Bolzenelement, im dargestellten Beispiel eine Schraube, enthält einen ersten Schaftabschnitt 11 mit einem ersten Durchmesser, an den sich ein zweiter Schaftabschnitt 12 mit einem verringerten Durchmesser anschließt. Das freie Ende der Schraube bildet eine Schraubenspitze 13, die kegelförmig ausgebildet ist. Auf dem Schaftabschnitt 11 ist ein übliches Schraubengewinde aufgewalzt, während in dem Schraubenabschnitt 12 ein Steilgewinde 14 aufgewalzt ist. Die eigentliche Schraubenspitze enthält bei der Ausführungsform nach Figur 3 auch noch das Steilgewinde 14, während bei der ähnlichen Ausführungsform nach Figur 4 hier eine Fortsetzung des üblichen Schraubengewindes vorhanden ist.Figure 3 shows an example of a bolt element, which with a Rolling jaw according to the invention by the method according to the invention can be produced. The bolt element, in the example shown a screw, includes a first shaft portion 11 with a first Diameter, to which a second shaft portion 12 with a reduced diameter connects. The free end of the screw forms a screw tip 13 which is cone-shaped. On the Shank portion 11 is rolled a conventional screw thread, while in the screw portion 12, a coarse thread 14 is rolled is. The actual screw tip contains in the embodiment 3 also still the coarse thread 14, while in the similar Embodiment of Figure 4 here is a continuation of the usual Screw thread is present.

    Es kann aber auch an dieser Stelle ein komplettes Gewinde mit gleicher Steigung aufgewalzt werden.But it can also at this point a complete thread with the same Slope to be rolled.

    Die Herstellung eines Bolzenelements mit Hilfe der in Figur 1 dargestellten Walzbacke geschieht folgendermaßen. Der ggf. mit einem Kopf versehene zylindrische Drahtstift wird zwischen das Walzbackenpaar so eingelegt, dass er an dem in Figur 1 vorderen Ende der Walzbacke 1 in seiner korrekten axialen Position angeordnet ist. Dann werden die beiden Walzbacken zueinander parallel verschoben. Die Stirnfläche 7 des die Reduzierfläche 6 enthaltenden Bauteils dringt dann in das Material des Drahtstifts ein und verringert dessen Dicke in diesem Bereich. Bei dem Fortschreiten des Walzens vergrößert sich der Bereich mit diesem verringerten Durchmesser in axialer Richtung, wobei das Material in Richtung auf das freie Ende verdrängt wird. Dies ergibt sich aus dem schrägen Verlauf des vorderen Randes 8 der Reduzierfläche 6. Wenn bei weiterer Walzbewegung der Drahtstift das hintere Ende der Reduzierfläche 6 erreicht hat, ist der Bereich verringerten Durchmessers fertig gewalzt. Anschließend wird in diesem Bereich mit Hilfe der Verrippung 10 ein Steilgewinde aufgewalzt.The production of a bolt element with the aid of the in Figure 1 shown rolling jaw is done as follows. The possibly with a Headed cylindrical wire pin is placed between the Rolling jaw pair inserted so that it is at the front end in Figure 1 the rolling jaw 1 is arranged in its correct axial position. Then the two dies are moved parallel to each other. The end face 7 of the reducing surface 6 containing component penetrates then in the material of the wire pin and reduces its thickness in this area. As the rolling progresses, the size increases Area with this reduced diameter in the axial direction, where the material is displaced towards the free end. This results from the oblique course of the front edge 8 of the Reduction surface 6. If, during further rolling movement, the wire pin engages has reached the rear end of the reduction 6, is the range reduced diameter finished rolled. Subsequently, in this Area with the help of ribbing 10 a coarse thread rolled.

    Während der gesamten Walzbearbeitung wird in dem Bereich, in dem die Reduzierfläche 6 nicht wirksam ist, das übliche Schraubengewinde aufgewalzt. Der Walzvorgang des Gewindes auf dem Schaftbereich 11 mit dem nicht verringerten Durchmesser beginnt also gleich mit der Bearbeitung, während das Steilgewinde erst zu einem späteren Zeitpunkt aufgewalzt wird. Gleichzeitig mit dem Aufwalzen des Steilgewindes 10 wird auch die Schraubenspitze mit Hilfe der Walzbacke gebildet. Dies ist im Einzelnen nicht erläutert.Throughout the rolling process, in the area in which the reduction 6 is not effective, the usual screw thread rolled on. The rolling operation of the thread on the shaft portion 11 with the unreduced diameter starts so with the same Machining while the coarse thread until later Time is rolled. Simultaneously with the rolling of the Steep thread 10 is also the screw tip with the help of Rolled jaw formed. This is not explained in detail.

    Bei dieser Walzbearbeitung kann, sofern dies für spezielle Anwendungsfälle erforderlich ist, gleich auch eine Ringnut mit eingewalzt werden.In this rolling process can, if for special Use cases is required, equal to an annular groove with be rolled.

    Nach der Lehre der Erfindung wird gleichzeitig gewalzt und reduziert. Im oberen Teil wird das Gewinde gewalzt, im unteren Teil wird reduziert. Durch das Walzen des oberen Gewindes ist ein sicheres Antrieb der Schraube möglich und der Winkel der Reduzierbarke kann dadurch ca. 20° anstelle 6° bis 10° betragen, wie dies im Stand der Technik bekannt ist.According to the teachings of the invention is rolled and reduced simultaneously. in the the upper part is rolled, the lower part is reduced. By rolling the upper thread is a safe drive of Screw possible and the angle of Reduzierbarke can thereby approx 20 ° instead of 6 ° to 10 °, as known in the art is.

    Durch die Integration des Reduzierens in die Walzbacke sind die Walzbacken gegenüber den herkömmlichen Walzbacken, die mit reduzierten Rohlingen arbeiten, nicht länger. Dies bedeutet, dass keine größere und damit auch langsamere und teurere Maschine eingesetzt werden muss.By integrating the reduction in the rolling die are the Rolling jaws compared to the conventional dies, with reduced blanks work, no longer. This means that no larger and therefore also slower and more expensive machine used must become.

    Claims (15)

    1. Method for producing a cylindrical bolt element with two sections of different diameter, whereby a wire nail is cut from a wire, the wire nail is inserted between two roller jaws (1), and a corresponding section of the wire nail is rolled to a reduced diameter, characterized in that a steep thread is rolled onto the section with the reduced diameter after the diameter is reduced, and a thread is rolled onto the section of the bolt element that is not reduced while reducing the reduced section.
    2. Method according to claim 1, characterized in that the excess wire nail material arising during reduction is displaced toward the free end of the wire nail.
    3. Method according to claim 1 or 2, characterized in that the axial length of the section with a reduced diameter is extended during the rolling process.
    4. Method according to one of the prior claims, characterized in that the wire nail is rolled with two roller jaws (1) of which at least one has a reducing surface (6) that projects in comparison to its rolling surface (2).
    5. Method according to one of the prior claims, characterized in that the reducing surface (6) extends in the rolling direction (4).
    6. Method according to claim 4 or 5, characterized in that the reducing surface (6) starts narrow.
    7. Method according to one of claims 4 to 6, characterized in that the edge (8) of the reducing surface (6) assigned to the free end of the wire nail is angled in relation to the rolling direction (4).
    8. Method according to one of claims 4 to 7, characterized in that the height of the reducing surface (6) remains constant in relation to the rolling surface (2).
    9. Method according to one of the prior claims, characterized in that the wire nail is provided with a head before rolling.
    10. Pair of roller jaws to create a bolt element with two sections of different diameter with a rolling surface (2) on each roller jaw (1), and a reducing surface (6) on at least one roller jaw (1) that is elevated in relation to the rolling surface (2) of the respective roller jaw (1), characterized in that a ribbing (10) to form a steep thread (14) is provided after the reducing surface (6) viewed in the rolling direction.
    11. Pair of roller jaws according to claim 10, characterized in that the reducing surface (6) has a smooth surface.
    12. Pair of roller jaws according to claim 10 or 11, characterized in that the reducing surface (6) is designed such that it extends in the rolling direction (4).
    13. Pair of roller jaws according to one of claims 10 to 12, characterized in that the reducing surface (6) starts narrow.
    14. Pair of roller jaws according to one of claims 10 to 13, characterized in that the part (5) of the roller jaw (1) having the reducing surface (6) is designed to be removable.
    15. Pair of roller jaws according to one of claims 10 to 14, characterized in that the reducing surface (6) only extends over a part of the length of the roller jaws (1) in the direction of rolling (4).
    EP01117159A 2000-08-10 2001-07-14 Method and device for the manufacture of screw elements Expired - Lifetime EP1186360B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    DK01117159T DK1186360T3 (en) 2000-08-10 2001-07-14 Method and device for making bolt elements

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10039011A DE10039011A1 (en) 2000-08-10 2000-08-10 Bolt element producing process involves measuring out wire pin, fitting it between two roll jaws and rolling wire pin to reduced diameter in one sector
    DE10039011 2000-08-10

    Publications (3)

    Publication Number Publication Date
    EP1186360A2 EP1186360A2 (en) 2002-03-13
    EP1186360A3 EP1186360A3 (en) 2002-12-18
    EP1186360B1 true EP1186360B1 (en) 2005-03-16

    Family

    ID=7651944

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP01117159A Expired - Lifetime EP1186360B1 (en) 2000-08-10 2001-07-14 Method and device for the manufacture of screw elements

    Country Status (6)

    Country Link
    EP (1) EP1186360B1 (en)
    AT (1) ATE290934T1 (en)
    DE (2) DE10039011A1 (en)
    DK (1) DK1186360T3 (en)
    ES (1) ES2239639T3 (en)
    PT (1) PT1186360E (en)

    Families Citing this family (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE10254319B3 (en) * 2002-11-21 2004-09-16 Duve Kaltformtechnik Gmbh Production of a screw having a bore tip for securing wood constructions comprises forming the thread and the tapping point in a common finishing step by rolling
    DE102011076180A1 (en) * 2011-05-20 2012-11-22 Hilti Aktiengesellschaft Anchor bolt for expansion anchor, has expansion body which is arranged coaxially with respect to axis, where circumferential surface of expansion body has ribs and grooves in alternating manner in circumferential direction

    Family Cites Families (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE45391C (en) * AMERICAN Screw Co. by Edwin G. Awgell President in New-York Thread rolling dies
    DD33566A (en) *
    US2314390A (en) * 1939-08-17 1943-03-23 New Process Screw Corp Method and apparatus for rolling screws
    GB2220721B (en) * 1988-07-11 1992-02-12 Austin Rover Group A method of making threaded fasteners
    SU1637923A1 (en) * 1988-12-05 1991-03-30 Предприятие П/Я М-5514 Tool for simultaneously rolling thread and smooth cylindrical surface
    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
    US5242253A (en) * 1992-10-08 1993-09-07 Semblex Corporation Thread-forming screw
    EP0682187A3 (en) * 1994-04-13 1996-03-13 Bergner Richard Gmbh Co Method of manufacturing a screw and screw blank for this method.
    JPH08108239A (en) * 1994-10-05 1996-04-30 Toyota Motor Corp Form rolling die
    DE19632838A1 (en) * 1996-08-15 1998-02-19 Adolf Wuerth Gmbh & Co Kg Screw with a self-drilling tip

    Also Published As

    Publication number Publication date
    EP1186360A2 (en) 2002-03-13
    ATE290934T1 (en) 2005-04-15
    EP1186360A3 (en) 2002-12-18
    ES2239639T3 (en) 2005-10-01
    DE50105600D1 (en) 2005-04-21
    PT1186360E (en) 2005-06-30
    DK1186360T3 (en) 2005-07-25
    DE10039011A1 (en) 2002-02-21

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