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EP1576199B1 - Method for the production of a screw, and screw produced according to said method - Google Patents

Method for the production of a screw, and screw produced according to said method Download PDF

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Publication number
EP1576199B1
EP1576199B1 EP03808281.4A EP03808281A EP1576199B1 EP 1576199 B1 EP1576199 B1 EP 1576199B1 EP 03808281 A EP03808281 A EP 03808281A EP 1576199 B1 EP1576199 B1 EP 1576199B1
Authority
EP
European Patent Office
Prior art keywords
screw
screws
ultra
strength steel
production
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.)
Expired - Lifetime
Application number
EP03808281.4A
Other languages
German (de)
French (fr)
Other versions
EP1576199A2 (en
Inventor
Thomas MÄTZLER
Ernst Rohner
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.)
SFS Group International AG
Original Assignee
SFS Intec Holding AG
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 SFS Intec Holding AG filed Critical SFS Intec Holding AG
Publication of EP1576199A2 publication Critical patent/EP1576199A2/en
Application granted granted Critical
Publication of EP1576199B1 publication Critical patent/EP1576199B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts

Definitions

  • the invention relates to a method for producing a screw, in particular a screw for indexable inserts, which has an internal attack, and a screw.
  • GB 1535775 discloses a method for producing high strength parts by cold forming, eg screws and nuts made of unalloyed or low alloyed cold work steels.
  • the present invention has set itself the task of overcoming this prejudice of the art and to provide the possibility of producing screws with internal attack of a high-strength material.
  • this is achieved by a method in which ultrahigh-strength steel is used as the starting material and in which the screw, including the inner attack, is produced by cold-working the starting material.
  • optimum properties for receiving a large torque and also for achieving high tensile strength result in a screw, in particular a screw with internal attack for use in indexable inserts, which is made of ultra-high-strength steel and is made by cold forming.
  • a shown in the drawing, in particular for the attachment of indexable inserts made screw 1 has a head 2 and a provided with a thread 5 shaft 4. On the shaft 4 with a diameter D, the thread 5 is rolled up with the outer diameter D1.
  • the head 2 in the manner of a lens countersunk head has a diameter D3.
  • an internal attack 3 is formed for the use of a drive element.
  • a hole 7 shown in phantom
  • the production takes place by cold forming of the starting material, with ultra high-strength steel being used as the starting material, which has hitherto not been considered feasible by the person skilled in the art.
  • any type of ultra-high-strength steel is to be processed by cold-working the starting material, but in an actual case the starting material is an ultra-high-strength steel with the composition C 0.03, Mo 5.0, Ni 18.5, Co 8.5, Ti 0.6, Al 0.1, balance Fe, as particularly suitable.
  • the invention has made it possible to produce a screw, in particular a screw for indexable inserts, which is made of ultra-high-strength steel and is produced by cold forming. This results in significant improvements in terms of the strength of the screw.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Schraube, insbesondere einer Schraube für Wendeschneidplatten, welche einen Innenangriff aufweist, sowie eine Schraube.The invention relates to a method for producing a screw, in particular a screw for indexable inserts, which has an internal attack, and a screw.

An sich ist die Fertigung von Schrauben durch Kaltumformen eines Ausgangsmaterials in verschiedenen Varianten bekannt. Probleme gibt es erst bei hochfesten Ausgangsmaterialien. Hier wird bisher immer davon ausgegangen, dass ausschließlich eine spanende, also materialabarbeitende Fertigung möglich ist. Eine solche Herstellung von Schrauben ist aber mit großem Aufwand und daher auch hohen Kosten verbunden. Der Fachmann ist aber nach wie vor davon überzeugt, dass ab einer gewissen Festigkeit des Ausgangsmaterials eine Herstellung von Schrauben mit Innenangriff, und hier insbesondere relativ kleiner Schrauben, durch Kaltumformung unmöglich ist.In itself, the manufacture of screws by cold forming a starting material in different variants is known. There are problems only with high-strength starting materials. Up to now, it has always been assumed that only a machining, that is, material-processing production, is possible. However, such a production of screws is associated with great expense and therefore high costs. However, the skilled person is still convinced that starting from a certain strength of the starting material, it is impossible to produce screws with internal attack, and here in particular relatively small screws, by cold forming.

GB 1535775 offenbart ein Verfahren Zur Herstellung hochfester Teile durch Kaltumformen, z.B. Schrauben und Muttern aus unlegierten oder niedriglegierten Kaltarbeitsstählen. GB 1535775 discloses a method for producing high strength parts by cold forming, eg screws and nuts made of unalloyed or low alloyed cold work steels.

Die vorliegende Erfindung hat sich zur Aufgabe gestellt, dieses Vorurteil der Fachwelt zu überwinden und die Möglichkeit der Herstellung von Schrauben mit Innenangriff aus einem hochfestem Material zu schaffen.The present invention has set itself the task of overcoming this prejudice of the art and to provide the possibility of producing screws with internal attack of a high-strength material.

Erfindungsgemäß gelingt dies durch ein Verfahren, bei welchem als Ausgangsmaterial ultrahochfester Stahl eingesetzt wird und bei dem die Schraube einschliesslich des Innenangriffes durch Kaltumformen des Ausgangsmaterials gefertigt wird.According to the invention, this is achieved by a method in which ultrahigh-strength steel is used as the starting material and in which the screw, including the inner attack, is produced by cold-working the starting material.

Es konnte in vielen Versuchsreihen festgestellt werden, dass sich der Fachmann aufgrund der unmöglich erscheinenden Fakten geirrt hat und dass es sehr wohl möglich ist Schrauben aus ultrahochfestem Stahl in einem Kaltumformverfahren herzustellen. Solche Schrauben haben gegenüber den durch spanende Bearbeitung hergestellten Schrauben aufgrund optimaler Querschnittsverhältnisse wesentlich bessere Festigkeitseigenschaften. Bei der bisher für möglich gehaltenen Herstellungsweise konnte gerade der Schlüsselangriff im Kopf nur so gefertigt werden, indem eine Vorbohrung gemacht werden musste, worauf dann in einem Stossverfahren die Schlüsselkontur hergestellt wurde. Bei der Herstellung im Kaltumformverfahren hingegen wird die Schlüsselkontur, z.B. ein Innensechsrund, beim Kaltumformpressvorgang ohne vorheriges Vorbohren hergestellt. Es ist daher die Öffnung für den Schlüsselangriff wesentlich weniger tief auszuführen als dies mit einem Vorbohrvorgang der Fall ist. Am Übergang zwischen Schraubenkopf und Schaft ist daher die Festigkeit wesentlich höher, da mehr Materialdicke zwischen der Öffnung für den Schlüsselangriff und der Außenkontur verbleibt. Die bei einer spanabhebenden Bearbeitung sich ergebenden Schwachstellen sind somit verhindert worden.It was found in many series of experiments that the expert was wrong because of the seemingly impossible facts and that it is quite possible to produce screws from ultra high strength steel in a cold forming process. Such screws have compared to the screws produced by machining due to optimal cross-sectional ratios significantly better strength properties. In the previously considered possible manufacturing method just the key attack in the head could only be made by a pilot hole had to be made, whereupon the key contour was then produced in a shock process. On the other hand, when producing by cold forming, the key contour, for example a hexalobular, is produced during the cold forming press process without prior predrilling. It is therefore the opening for the key attack to do much less deep than is the case with a pre-drilling. At the transition between the screw head and shaft therefore the strength is much higher, as more material thickness remains between the opening for the key attack and the outer contour. The resulting in a machining machining vulnerabilities have thus been prevented.

Dementsprechend optimale Eigenschaften zur Aufnahme eines großen Drehmomentes und auch zur Erreichung großer Zugfestigkeit ergeben sich bei einer Schraube, insbesondere einer Schraube mit Innenangriff für den Einsatz bei Wendeschneidplatten, die aus ultrahochfestem Stahl besteht und durch Kaltumformung hergestellt ist.Correspondingly, optimum properties for receiving a large torque and also for achieving high tensile strength result in a screw, in particular a screw with internal attack for use in indexable inserts, which is made of ultra-high-strength steel and is made by cold forming.

Es wurde zwar schon versucht, Schrauben aus hochfestem Stahl zu fertigen, wobei hier bisher Grenzen gesehen wurden, wenn auch ein Innenangriff mitgefertigt werden sollte. Durch die Erfindung konnte dieses Vorurteil der Fachwelt überwunden werden.Although it has been tried to make screws from high-strength steel, which has been seen here limits, even if an internal attack should be mitgefertigt. By the invention, this prejudice of the professional world could be overcome.

Besonders vorteilhaft bei einem solchen Verfahren und einer nach dem Verfahren hergestellten Schraube ist es, wenn als Ausgangsmaterial ein ultrahochfester Stahl mit der Zusammensetzung C 0,03, Mo 5,0, Ni 18,5, Co 8,5, Ti 0,6, Al 0,1, Rest Fe, eingesetzt wird. Gerade bei einer solchen Zusammensetzung ist der Fachmann bisher davon ausgegangen, dass eine Herstellung im Kaltumformverfahren nicht möglich sei. Durch die vorliegende Erfindung konnte das Gegenteil bewiesen werden.It is particularly advantageous in such a method and a screw produced by the method, if as starting material an ultra-high-strength steel with the composition C 0.03, Mo 5.0, Ni 18.5, Co 8.5, Ti 0.6, Al 0.1, balance Fe, is used. Particularly in the case of such a composition, the person skilled in the art has hitherto assumed that production in the cold forming process would not be possible. By the present invention, the opposite could be proved.

Weitere erfindungsgemäße Merkmale und besondere Vorteile werden in der nachstehenden Beschreibung anhand der Zeichnung noch näher erläutert. Es zeigen:

  • Fig.1 eine Seitenansicht einer Schraube, teilweise aufgeschnitten dargestellt;
  • Fig.2 eine Draufsicht auf den Kopf der Schraube.
Other features and advantages of the invention will become apparent from the following description with reference to the drawings. Show it:
  • Fig.1 a side view of a screw, shown partially cut away;
  • Fig.2 a plan view of the head of the screw.

In der Zeichnung ist ein Ausführungsbeispiel einer Schraube dargestellt, wie sie für die Befestigung von Wendeschneidplatten eingesetzt wird. Natürlich können die erfindungsgemäßen Maßnahmen in gleicher Weise für Schrauben in anderen Einsatzbereichen angewendet werden. Gerade bei Schrauben, die in engen Toleranzen hergestellt werden müssen und vor allem auf Drehmoment und Zug belastet sind, hat sich gezeigt, dass im Kaltumformverfahren hergestellte Schrauben wesentlich besser sind als durch spanabhebende Bearbeitung hergestellte Schrauben. Da aber gerade Schrauben aus ultrahochfestem Stahl das optimale Ausgangsmaterial für solche Schrauben ist, fertigte man bisher solche Schrauben als Drehteil, weil der Fachmann eine Fertigung im Kaltumformverfahren für schlicht unmöglich hielt.In the drawing, an embodiment of a screw is shown, as it is used for the attachment of indexable inserts. Of course, the inventive measures can be applied in the same way for screws in other applications become. Especially with screws that need to be manufactured in close tolerances and are mainly loaded on torque and train, it has been shown that screws produced in the cold forming process are much better than screws produced by machining. But just because screws made of ultra-high-strength steel is the optimal starting material for such screws, so far made such screws as a turned part, because the expert held a production in the cold forming process simply impossible.

Eine auf der Zeichnung gezeigte, insbesondere für die Befestigung von Wendeschneidplatten gefertigte Schraube 1 weist einen Kopf 2 und einen mit einem Gewinde 5 versehenen Schaft 4 auf. Auf den Schaft 4 mit einem Durchmesser D ist das Gewinde 5 mit dem Außendurchmesser D1 aufgerollt. Der Kopf 2 nach Art eines Linsensenkkopfes weist einen Durchmesser D3 auf. Im Kopf 2 ist ein Innenangriff 3 zum Einsatz eines Antriebselementes ausgebildet. Bei der Fertigung im Kaltumformverfahren ergibt sich lediglich eine kleine Vertiefung 6 am Grund des Innenangriffes 3. Bei einer bisher bekannten Fertigung durch Spanabhebung musste auch bei der Herstellung des Innenangriffes 3 eine Bohrung 7 (strichliert dargestellt) vorab hergestellt werden, die entsprechend tief ausgebildet sein musste, um anschließend in einem Stossverfahren den Schlüsselabgriff herzustellen. Aufgrund der doch unterschiedlichen Abschnitte mit verschiedenen Durchmessern ist ein relativ hoher Umformgrad zu berücksichtigen, wobei dies bisher beim Einsatz von ultrahochfestem Stahl als unmöglich galt.A shown in the drawing, in particular for the attachment of indexable inserts made screw 1 has a head 2 and a provided with a thread 5 shaft 4. On the shaft 4 with a diameter D, the thread 5 is rolled up with the outer diameter D1. The head 2 in the manner of a lens countersunk head has a diameter D3. In the head 2, an internal attack 3 is formed for the use of a drive element. When manufacturing by cold forming, only a small recess 6 at the bottom of Innenangriffes 3. In a previously known production by chip removal had in the production of the inner attack 3 a hole 7 (shown in phantom) are prepared in advance, which had to be formed correspondingly deep in order subsequently to produce the key tap in a collision procedure. Due to the different sections with different diameters, a relatively high degree of deformation must be taken into account, which was previously considered impossible when using ultra-high-strength steel.

Bei dem erfindungsgemäß eingesetzten Verfahren zur Herstellung der Schraube, insbesondere eben einer Schraube für Wendeschneidplatten erfolgt die Fertigung durch Kaltumformen des Ausgangsmaterials, wobei als Ausgangsmaterial ultrahochfester Stahl eingesetzt wird, was bisher vom Fachmann als nicht durchführbar angesehen worden ist. Im Rahmen der Erfindung ist jede Art ultrahochfester Stahl durch Kaltumformen des Ausgangsmaterials zu verarbeiten, jedoch erweist sich im konkreten Falle als Ausgangsmaterial ein ultrahochfester Stahl mit der Zusammensetzung C 0,03, Mo 5,0, Ni 18,5, Co 8,5, Ti 0,6, Al 0,1, Rest Fe, als besonders geeignet.In the method used according to the invention for producing the screw, in particular just a screw for indexable inserts, the production takes place by cold forming of the starting material, with ultra high-strength steel being used as the starting material, which has hitherto not been considered feasible by the person skilled in the art. In the context of the invention, any type of ultra-high-strength steel is to be processed by cold-working the starting material, but in an actual case the starting material is an ultra-high-strength steel with the composition C 0.03, Mo 5.0, Ni 18.5, Co 8.5, Ti 0.6, Al 0.1, balance Fe, as particularly suitable.

Durch die Erfindung ist es ermöglicht worden, eine Schraube, insbesondere eine Schraube für Wendeschneidplatten, zu fertigen, die aus ultrahochfestem Stahl besteht und durch Kaltumformung hergestellt ist. Es ergeben sich dadurch wesentliche Verbesserungen in bezug auf die Festigkeit der Schraube.The invention has made it possible to produce a screw, in particular a screw for indexable inserts, which is made of ultra-high-strength steel and is produced by cold forming. This results in significant improvements in terms of the strength of the screw.

Beim Verfahren zur Herstellung der Schraube werden wie auch bei anderen Kaltumformverfahren weitere Verfahrensschritte zum Einsatz kommen, beispielsweise Waschvorgänge, Drehvorgänge zum Anfasen, Gleitschleifen, Gewinderollen, Oberflächenbehandlung, Endkontrolle usw.In the method of manufacturing the screw, as in other cold forming processes, further process steps are used, for example, washing operations, turning operations for chamfering, vibratory finishing, thread rolling, surface treatment, final inspection, etc.

Claims (4)

  1. Method for producing a screw, in particular a screw for indexable inserts, which screw comprises an interior engaging member, characterised in that ultra-high-strength steel is used as the initial material, and in that the screw, including the interior engaging member, is produced by means of cold-forming the initial material.
  2. Method according to claim 1, characterised in that ultra-high-strength steel having a composition of C 0.03, Mo 5.0, Ni 18.5, Co 8.5, Ti 0.6, Al 0.1, the remainder being Fe, is used as the initial material.
  3. Screw, in particular for indexable inserts, which consists of ultra-high-strength steel and is produced, including the interior engaging member, by means of cold-forming.
  4. Screw according to claim 3, characterised in that the ultra-high-strength steel has a composition of C 0.03, Mo 5.0, Ni 18.5, Co 8.5, Ti 0.6, Al 0.1, the remainder being Fe.
EP03808281.4A 2002-12-23 2003-12-17 Method for the production of a screw, and screw produced according to said method Expired - Lifetime EP1576199B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10260828 2002-12-23
DE10260828A DE10260828A1 (en) 2002-12-23 2002-12-23 Process for producing a screw and screw produced according to the process
PCT/EP2003/014384 WO2004059016A2 (en) 2002-12-23 2003-12-17 Method for the production of a screw, and screw produced according to said method

Publications (2)

Publication Number Publication Date
EP1576199A2 EP1576199A2 (en) 2005-09-21
EP1576199B1 true EP1576199B1 (en) 2014-10-01

Family

ID=32477956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03808281.4A Expired - Lifetime EP1576199B1 (en) 2002-12-23 2003-12-17 Method for the production of a screw, and screw produced according to said method

Country Status (8)

Country Link
US (1) US7632053B2 (en)
EP (1) EP1576199B1 (en)
JP (1) JP2006512210A (en)
KR (1) KR101105185B1 (en)
CN (1) CN100465298C (en)
AU (1) AU2003303348A1 (en)
DE (1) DE10260828A1 (en)
WO (1) WO2004059016A2 (en)

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WO2013150451A1 (en) * 2012-04-03 2013-10-10 Itw Construction Products, Aps Fastener with multilobular tool engaging portion
CN103111808B (en) * 2013-02-01 2017-09-15 贵州精立航太科技有限公司 A kind of nickel base superalloy GH4169 hexagon socket head cap screw processing technologys
RU2672660C1 (en) * 2014-12-17 2018-11-16 Рисёч Инжиниринг Энд Мэньюфэкчэринг Инк. Combination of fastening element with slotted head and screwdrivers
CN108339922B (en) * 2018-01-19 2019-08-20 宁波安拓实业有限公司 A kind of manufacturing method of automatic snap ring hexagonal flange cutting tooth type CONCRETE SCREWS
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Also Published As

Publication number Publication date
KR101105185B1 (en) 2012-01-13
AU2003303348A1 (en) 2004-07-22
EP1576199A2 (en) 2005-09-21
AU2003303348A8 (en) 2004-07-22
US20060078403A1 (en) 2006-04-13
WO2004059016A3 (en) 2005-03-03
KR20050085410A (en) 2005-08-29
WO2004059016A2 (en) 2004-07-15
CN1729302A (en) 2006-02-01
JP2006512210A (en) 2006-04-13
US7632053B2 (en) 2009-12-15
DE10260828A1 (en) 2004-07-08
CN100465298C (en) 2009-03-04

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