EP1299651A1 - Self-tapping fastener - Google Patents

Self-tapping fastener

Info

Publication number
EP1299651A1
EP1299651A1 EP01962810A EP01962810A EP1299651A1 EP 1299651 A1 EP1299651 A1 EP 1299651A1 EP 01962810 A EP01962810 A EP 01962810A EP 01962810 A EP01962810 A EP 01962810A EP 1299651 A1 EP1299651 A1 EP 1299651A1
Authority
EP
European Patent Office
Prior art keywords
drilling
section
stainless steel
self
fastener
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.)
Withdrawn
Application number
EP01962810A
Other languages
German (de)
French (fr)
Inventor
Michael Köppel
Bernhard Hinz
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 EP1299651A1 publication Critical patent/EP1299651A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/008—Corrosion preventing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0094—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/90—Fastener or fastener element composed of plural different materials

Definitions

  • the invention relates to a self-drilling fastener made of stainless steel with a shaft formed at one end with a tool attack and at the other end with a drilling part, which optionally has a thread on a partial section.
  • a screw made of stainless steel has already become known (EP 0 861 379 B1), in which a first shaft section made of austenitic steel and the screw tip having a screw head made of martensitic steel with a carbon content of less than 0.01 have a screw head % are provided.
  • Such a design is already in the direction of a completely rustproof screw, but this minimum carbon content of less than 0.01% does not yet result in optimal drilling properties.
  • the present invention has therefore set itself the task of creating a self-drilling fastener of the type mentioned, in which there is both the requirement of the stainless material in the load-bearing area of the fastener, but in which optimal drilling performance can also be achieved despite the stainless design of the fastener in the area of the drilling part.
  • the shaft is formed from two sections of rustproof material which are positively, materially and / or non-positively connected to one another, the first section of the shaft having a tool attack and optionally a threaded region made of a rust-free, purely ferritic or austenitic steel or a duplex stainless steel and the second section of the shaft, which is designed as a drilling part or has the drilling part, is formed from a martensitic, stainless steel with a carbon content of 0.04% to 0.3%.
  • the second section prefferably be induction hardened.
  • the martensitic, stainless steel has a proportion of 0.04% to 0.3% carbon and 8% to 20% chromium and also contains proportions of molybdenum, nitrogen, manganese and nickel. This combination of materials ensures that there is optimal cold forming for the production of the drill part and that sufficient hardness can be achieved to produce a hole in a wide variety of materials.
  • the martensitic, stainless steel has a content of 0.1% carbon and 11.6% chromium and also contains 0.01% nitrogen, 0.6% manganese and 0.2% nickel , It is further proposed that the first and the second section are connected to one another by means of welding, soldering, gluing, joining, pressing in or the like.
  • the choice of material for the two sections results in homogeneous, non-embrittling connection zones, even if a welding process is carried out at correspondingly high temperatures.
  • soldering, gluing, joining or pressing there are also excellent possibilities for mutual connection by soldering, gluing, joining or pressing. All variants of the mutual connection of the two sections are therefore open, depending on the structural design of the self-drilling fastener and on the use for which such a self-drilling fastener is intended.
  • the fastener has a surface treatment by passivation. Additional protection can be achieved in this way and, in addition, the drilling performance and the forming torque during thread production can also be improved by an appropriate surface treatment.
  • Figure 1 is a screw with a drilling part in side view.
  • Fig. 2 shows a screw in side view with a drilling part designed as a drilling plate.
  • the invention is based on a self-drilling fastener, since the features according to the invention can be used for all types of self-drilling fasteners.
  • the measures according to the invention can be used in the same way for self-drilling rivets, self-drilling bolts or self-drilling dowels.
  • a self-drilling screw 1 which has a shaft 2, a screw head 3 with a tool attack 4 and a drilling part 5.
  • the shaft 2 can optionally have a thread 6.
  • a thread 6 or a corresponding thread area is of course always provided.
  • the shaft 2 is now formed from two sections 7 and 8, both sections 7 and 8 being formed from a stainless material.
  • sections 7 and 8 are positively, materially and / or non-positively connected, for example by welding, soldering, gluing, joining, pressing or the like.
  • a purely positive connection is also possible, namely in one section 7 or 8 on the mutual contact surface an opening and on the other section 7 or 8 there is a corresponding bolt, wherein a corresponding positive engagement is possible by appropriate design (for example, square or hexagonal cross section). In such a case, it is also possible to easily remove the drilling part 5 after the screw has been screwed in.
  • the first section 7 of the shank which has the tool attack 4, that is to say the screw head 3 and the thread 6 in the present case, is formed from a stainless, purely ferritic or austenitic steel.
  • the required strength values can be achieved, which are required when using screws, for example in building construction. It is also conceivable here to use a duplex stainless steel which is equivalent to the purely ferritic or austenitic steel in terms of its stainless properties and also its strength.
  • the second section 8 of the shaft 2, designed as a drilling part 5, is formed from a martensitic, stainless steel with a carbon content of 0.04% to 0.3%.
  • the martensitic, stainless steel has a proportion of 0.04% to 0.3% carbon and 8% to 20% chromium and also contains proportions of molybdenum, nitrogen, manganese and nickel.
  • Optimal results can be achieved if the martensitic, stainless steel contains 0.1% carbon and 11.6% chromium and also contains 0.01% nitrogen, 0.6% manganese and 0.2% nickel.
  • a screw according to FIGS. 1 and 2 can of course also be subjected to a surface treatment, passivation being advantageous. However, there are also other surface treatment options.
  • section 8 there are various possibilities in terms of the manufacturing process. It is thus conceivable to connect section 8 to section 7 before the drilling part 5 is manufactured or after its manufacture. It is precisely because of the special choice of material of the two stainless sections 7 and 8 that it is possible to harden section 8 beforehand or after the two sections 7 and 8 have been joined. It is precisely because of the special carbon content that it is possible to easily achieve one To carry out curing in a belt furnace, so that industrial production of large masses is guaranteed. Furthermore, inductive hardening of the second section 8 is also conceivable.
  • the two sections 7 and 8 of the shaft 2 are connected to one another at their mutually facing end regions (represented by the line 9).
  • This parting plane can be placed so that the thread 6 is guided over both sections 7 and 8, so that after the mutual connection of the two sections 7 and 8, the thread is only produced. But it is also conceivable to provide this connection area in such a way that in section 8 only the drilling part 5 and in section 7 the shaft 2 with the rolled thread 6 is present.
  • the drilling part 5 is designed as a drilling plate which is inserted into a corresponding slot at the free end of the shaft 2 forming the section 7 and fastened in this slot.
  • the entire shaft 2 together with the screw head 3 can thus be regarded as section 7, whereas section 8 is formed exclusively by the drilling part 5 designed as a drilling plate.
  • a self-drilling fastener of any kind can be used, although even with self-drilling screws 1, such a large screw head 3 as shown in FIGS. 1 and 2 need not be provided. It would also be conceivable to provide practically only one type of shank 2, which is provided with an internal tool attack at the end facing away from the drilling part 5. However, it would also be possible to provide a type of pin with tool engagement at this end of the screw, the pin of the pin having the outer dimension being equal to or smaller than the outer thread diameter.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Connection Of Plates (AREA)
  • Insertion Pins And Rivets (AREA)

Abstract

A self-tapping screw (1) consists of two interconnected sections (7 and 8) of stainless material. The first section (7) comprising the tool access (4) and the thread (6) consists of stainless, austenitic steel and the second section (8) configured as a boring part (5) consists of martensitic steel.

Description

Selbstbohrender Befestiger Self-drilling fastener
Die Erfindung betrifft einen selbstbohrenden Befestiger aus rostfreiem Stahl mit einem an seinem einen Ende mit einem Werkzeugangriff und an seinem anderen Ende mit einem Bohrteil ausgebildeten Schaft, welcher gegebenenfalls auf einem Teilabschnitt ein Gewinde aufweist.The invention relates to a self-drilling fastener made of stainless steel with a shaft formed at one end with a tool attack and at the other end with a drilling part, which optionally has a thread on a partial section.
Es ergeben sich immer mehr Forderungen nach Befestigern aus rostfreiem Stahl, welche insbesondere im Bauwesen eingesetzt werden können, welche eine ausreichende Festigkeit bieten und außerdem optimale Bohreigenschaften mit sich bringen.There are more and more demands for fasteners made of stainless steel, which can be used in particular in construction, which offer sufficient strength and also bring optimal drilling properties with them.
Bisher ist in der Regel davon ausgegangen worden, daß bei Befestigern aus rostfreiem Stahl, welche aus Festigkeitsgründen aus einem austenitischen Stahl bestehen müssen, ein Bohrteil aus einem Kohlenstoffstahl anzubringen ist. Bei diesen dann entsprechend härtbaren Bohrteilen ergibt sich jedoch der Nachteil, daß bei entsprechendem Freiliegen derselben eine Rostbildung stattfindet. Es wird daher schon allein aus ästhetischen Gründen die Forderung erhoben, andere Ausbildungsmöglichkeiten von selbstbohrenden Befestigern vorzusehen.So far it has generally been assumed that a fastener made of carbon steel is to be attached to fasteners made of stainless steel, which for strength reasons must consist of an austenitic steel. With these then correspondingly hardenable drilling parts, however, there is the disadvantage that rust formation takes place when the parts are exposed accordingly. For aesthetic reasons alone, there is a demand to provide other training options for self-drilling fasteners.
Es ist bereits eine Schraube aus rostfreiem Stahl bekannt geworden (EP 0 861 379 B1), bei welcher ein erster, den Schraubenkopf aufweisender Schaftabschnitt aus austenitischem Stahl und ein zweiter, die Schraubenspitze aufweisender Schaftabschnitt aus martensitaushärtendem Stahl mit einem Kohlenstoffgehalt von weniger als 0,01 % vorgesehen sind. Eine solche Ausführung geht zwar bereits in die Richtung einer vollständig rostfreien Schraube, doch bringt dieser minimalste Kohlenstoffgehalt von weniger als 0,01% noch keine optimalen Bohreigenschaften mit sich.A screw made of stainless steel has already become known (EP 0 861 379 B1), in which a first shaft section made of austenitic steel and the screw tip having a screw head made of martensitic steel with a carbon content of less than 0.01 have a screw head % are provided. Such a design is already in the direction of a completely rustproof screw, but this minimum carbon content of less than 0.01% does not yet result in optimal drilling properties.
Die vorliegende Erfindung hat sich daher zur Aufgabe gestellt, einen selbstbohrenden Befestiger der eingangs genannten Art zu schaffen, bei welchem sowohl die Forderung des rostfreien Materials im tragenden Bereich des Befestigers gegeben ist, bei welchem aber zusätzlich optimale Bohrleistungen erzielt werden können trotz rostfreier Ausbildung des Befestigers im Bereich des Bohrteiles.The present invention has therefore set itself the task of creating a self-drilling fastener of the type mentioned, in which there is both the requirement of the stainless material in the load-bearing area of the fastener, but in which optimal drilling performance can also be achieved despite the stainless design of the fastener in the area of the drilling part.
Erfindungsgemäß gelingt dies dadurch, daß der Schaft aus zwei Abschnitten rostfreien Materials gebildet ist, welche form-, stoff- und/oder kraftschlüssig miteinander verbunden sind, wobei der den Werkzeugangriff und gegebenenfalls einen Gewindebereich aufweisende, erste Abschnitt des Schaftes aus einem rostfreien, rein ferritischen oder austenitischen Stahl oder einem rostfreien Duplexstahl und der zweite, als Bohrteil ausgebildete oder den Bohrteil aufweisende Abschnitt des Schaftes aus einem martensitischen, rostfreien Stahl mit einem Kohlenstoff-Anteil von 0,04% bis 0,3% gebildet ist.According to the invention, this is achieved in that the shaft is formed from two sections of rustproof material which are positively, materially and / or non-positively connected to one another, the first section of the shaft having a tool attack and optionally a threaded region made of a rust-free, purely ferritic or austenitic steel or a duplex stainless steel and the second section of the shaft, which is designed as a drilling part or has the drilling part, is formed from a martensitic, stainless steel with a carbon content of 0.04% to 0.3%.
Es ergeben sich dadurch sehr gute Verbindungsmöglichkeiten der beiden Abschnitte, da zwei Werkstoffe mit praktisch gleicher Wärmeausdehnung eingesetzt sind. Beide Abschnitte können als rostfrei bezeichnet werden, wobei jedoch durch den erhöhten Kohlenstoffanteil in dem martensitischen, rostfreien Stahl die Bohreigenschaften wesentlich verbessert werden können. Es ist damit eine optimale Ausgestaltung eines Befestigers möglich, weil eben der tragende Bereich entsprechende Festigkeitswerte aufweist und der bohrende Bereich trotz der rostfreien Ausgestaltung ausgezeichnete Bohreigenschaften mit sich bringt, weil eben durch den entsprechenden Kohlenstoffanteil eine ausreichende Härtung möglich ist.This results in very good connection options for the two sections, since two materials with practically the same thermal expansion are used. Both sections can be described as rust-free, but the drilling properties can be significantly improved by the increased carbon content in the martensitic, stainless steel. An optimal design of a fastener is possible because the load-bearing area has corresponding strength values and the drilling area has excellent drilling properties despite the rustproof design, because sufficient hardening is possible due to the corresponding carbon content.
So ist es mit einem selbstbohrenden Befestiger der erfindungsgemäßen Art ohne weiteres möglich, auch rostfreie Bleche zu durchbohren.So it is easily possible with a self-drilling fastener of the type according to the invention to also pierce stainless steel sheets.
Gerade durch den Einsatz von martensitischem, rostfreiem Stahl mit einem Kohlenstoff-Anteil von 0,04% bis 0,3% ergibt sich auch die Möglichkeit, daß der zweite Abschnitt in einem Bandofen gehärtet ist. Auf diese Weise kann gerade bei einer industriellen Großfertigung von Befestigern eine optimale und kostengünstige Möglichkeit angewandt werden, um diesen Abschnitt entsprechend zu härten.The use of martensitic, stainless steel with a carbon content of 0.04% to 0.3% also gives rise to the possibility that the second section is hardened in a belt furnace. In this way, an optimal and cost-effective way can be used to harden this section accordingly, particularly in the case of large-scale industrial production of fasteners.
Weiters ist es auch möglich, daß der zweite Abschnitt induktiv gehärtet ist.Furthermore, it is also possible for the second section to be induction hardened.
Es ist somit insgesamt gesehen ein einfaches Herstellverfahren für einen selbstbohrenden Befestiger aus durchgehend rostfreiem Stahl gewährleistet.All in all, a simple manufacturing process for a self-drilling fastener made of stainless steel is guaranteed.
Bei einer besonderen Ausgestaltung wird vorgeschlagen, daß der martensitische, rostfreie Stahl einen Anteil von 0,04% bis 0,3% Kohlenstoff und 8% bis 20% Chrom aufweist und weiters Anteile von Molybdän, Stickstoff, Mangan und Nickelt enthält. Durch diese Materialkombination ist gewährleistet, daß eine optimale Kaltumformung für die Herstellung des Bohrteiles gegeben ist, und daß eine ausreichende Härte erzielbar ist, um eben in den verschiedensten Materialien eine Bohrung herzustellen.In a special embodiment, it is proposed that the martensitic, stainless steel has a proportion of 0.04% to 0.3% carbon and 8% to 20% chromium and also contains proportions of molybdenum, nitrogen, manganese and nickel. This combination of materials ensures that there is optimal cold forming for the production of the drill part and that sufficient hardness can be achieved to produce a hole in a wide variety of materials.
Dabei sieht eine konkrete Ausführungsform vor, daß der martensitische, rostfreie Stahl einen Anteil von 0,1% Kohlenstoff und 11 ,6% Chrom aufweist und weiters Anteile von 0,01% Stickstoff, 0,6% Mangan und 0,2% Nickel enthält. Weiters wird vorgeschlagen, daß der erste und der zweite Abschnitt mittels Schweißen, Löten, Kleben, Fügen, Einpressen oder dergleichen miteinander verbunden sind. Gerade durch die Materialwahl der beiden Abschnitte ergeben sich homogene, nicht versprödende Verbindungszonen, selbst wenn mit entsprechend hohen Temperaturen ein Schweißverfahren erfolgt. Gerade bei diesen beiden miteinander zu verbindenden Abschnitten ergeben sich aber auch ausgezeichnete Möglichkeiten der gegenseitigen Verbindung durch Löten, Kleben, Fügen oder Einpressen. Es stehen also alle Varianten der gegenseitigen Verbindung der beiden Abschnitte offen, je nachdem, welche konstruktive Gestaltung der selbstbohrende Befestiger hat und je nachdem, für welchen Einsatz ein solcher selbstbohrender Befestiger vorgesehen wird.A specific embodiment provides that the martensitic, stainless steel has a content of 0.1% carbon and 11.6% chromium and also contains 0.01% nitrogen, 0.6% manganese and 0.2% nickel , It is further proposed that the first and the second section are connected to one another by means of welding, soldering, gluing, joining, pressing in or the like. The choice of material for the two sections results in homogeneous, non-embrittling connection zones, even if a welding process is carried out at correspondingly high temperatures. Especially with these two sections to be connected, there are also excellent possibilities for mutual connection by soldering, gluing, joining or pressing. All variants of the mutual connection of the two sections are therefore open, depending on the structural design of the self-drilling fastener and on the use for which such a self-drilling fastener is intended.
Im Rahmen der Erfindung ist es ferner möglich, daß der Befestiger eine Oberflächenbehandlung durch Passivierung aufweist. Es kann dadurch noch ein zusätzlicher Schutz erzielt werden, und außerdem können durch eine entsprechende Oberflächenbehandlung zusätzlich die Bohrleistung und das Einformdrehmoment bei der Gewindeherstellung verbessert werden.In the context of the invention it is also possible that the fastener has a surface treatment by passivation. Additional protection can be achieved in this way and, in addition, the drilling performance and the forming torque during thread production can also be improved by an appropriate surface treatment.
Weitere erfindungsgemäße Merkmale und besondere Vorteile werden in der nachstehenden Beschreibung anhand der Zeichnung noch näher erläutert. Es zeigen:Further features according to the invention and special advantages are explained in more detail in the following description with reference to the drawing. Show it:
Fig. 1 eine Schraube mit einem Bohrteil in Seitenansicht;Figure 1 is a screw with a drilling part in side view.
Fig. 2 eine Schraube in Seitenansicht mit einem als Bohrplättchen ausgebildeten Bohrteil.Fig. 2 shows a screw in side view with a drilling part designed as a drilling plate.
Es wird bei der Erfindung von einem selbstbohrenden Befestiger ausgegangen, da die erfindungsgemäßen Merkmale für alle Arten von selbstbohrenden Befestigern eingesetzt werden können. In der nachstehenden Beschreibung wird auf Beispiele Bezug genommen, welche eine selbstbohrende Schraube betreffen. Die erfindungsgemäßen Maßnahmen sind aber in gleicher Weise für selbstbohrende Nieten, selbstbohrende Bolzen oder selbstbohrende Dübel einsetzbar.The invention is based on a self-drilling fastener, since the features according to the invention can be used for all types of self-drilling fasteners. In the description below, reference is made to examples relating to a self-drilling screw. However, the measures according to the invention can be used in the same way for self-drilling rivets, self-drilling bolts or self-drilling dowels.
In den Fig. 1 und 2 ist eine selbstbohrende Schraube 1 dargestellt, welche einen Schaft 2, einen Schraubenkopf 3 mit einem Werkzeugangriff 4 sowie einen Bohrteil 5 aufweist. Der Schaft 2 kann gegebenenfalls ein Gewinde 6 aufweisen. Bei einer Schraube 1 ist selbstverständlich immer ein Gewinde 6 bzw. ein entsprechender Gewindebereich vorgesehen. Wenn es sich hier aber um selbstbohrende Dübel oder selbstbohrende Bolzen oder selbstbohrende Nieten handelt, ist in der Regel kein solcher Gewindebereich vorgesehen. Bei der Ausgestaltung nach Fig. 1 ist nun der Schaft 2 aus zwei Abschnitten 7 und 8 gebildet, wobei beide Abschnitte 7 und 8 aus einem rostfreien Material gebildet sind. Diese Abschnitte 7 und 8 werden form-, stoff- und/oder kraftschlüssig beispielsweise durch Schweißen, Löten, Kleben, Fügen, Einpressen oder dergleichen miteinander verbunden. Es ist aber auch eine rein formschlüssige Verbindung möglich, indem nämlich in dem einen Abschnitt 7 oder 8 an der gegenseitigen Berührungsfläche eine Öffnung und an dem anderen Abschnitt 7 oder 8 ein entsprechender Bolzen vorhanden ist, wobei durch entsprechende Ausgestaltung (z.B. viereckiger oder sechseckiger Querschnitt) ein gegenseitiger formschlüssiger Eingriff möglich ist. In einem solchen Falle ist es auch möglich, den Bohrteil 5 nach dem Eindrehen der Schraube leicht zu entfernen.1 and 2, a self-drilling screw 1 is shown, which has a shaft 2, a screw head 3 with a tool attack 4 and a drilling part 5. The shaft 2 can optionally have a thread 6. In the case of a screw 1, a thread 6 or a corresponding thread area is of course always provided. However, if it is a matter of self-drilling dowels or self-drilling bolts or self-drilling rivets, no such threaded area is generally provided. In the embodiment according to FIG. 1, the shaft 2 is now formed from two sections 7 and 8, both sections 7 and 8 being formed from a stainless material. These sections 7 and 8 are positively, materially and / or non-positively connected, for example by welding, soldering, gluing, joining, pressing or the like. However, a purely positive connection is also possible, namely in one section 7 or 8 on the mutual contact surface an opening and on the other section 7 or 8 there is a corresponding bolt, wherein a corresponding positive engagement is possible by appropriate design (for example, square or hexagonal cross section). In such a case, it is also possible to easily remove the drilling part 5 after the screw has been screwed in.
Der den Werkzeugangriff 4, also im vorliegenden Falle den Schraubenkopf 3 und das Gewinde 6 aufweisende erste Abschnitt 7 des Schaftes ist aus einem rostfreien, rein ferritischen oder austenitischen Stahl gebildet. Es sind dadurch die geforderten Festigkeitswerte erzielbar, die bei Einsatz von Schrauben beispielsweise im Hochbau verlangt werden. Es ist hier auch denkbar, einen rostfreien Duplexstahl einzusetzen, welcher dem rein ferritischen oder austenitischen Stahl von den rostfreien Eigenschaften und auch von der Festigkeit her gleichkommt.The first section 7 of the shank, which has the tool attack 4, that is to say the screw head 3 and the thread 6 in the present case, is formed from a stainless, purely ferritic or austenitic steel. As a result, the required strength values can be achieved, which are required when using screws, for example in building construction. It is also conceivable here to use a duplex stainless steel which is equivalent to the purely ferritic or austenitic steel in terms of its stainless properties and also its strength.
Der zweite, als Bohrteil 5 ausgebildete Abschnitt 8 des Schaftes 2 ist aus einem martensitischen, rostfreien Stahl mit einem Kohlenstoff-Anteil von 0,04% bis 0,3% gebildet.The second section 8 of the shaft 2, designed as a drilling part 5, is formed from a martensitic, stainless steel with a carbon content of 0.04% to 0.3%.
Dabei ist es besonders vorteilhaft, wenn der martensitische, rostfreie Stahl einen Anteil von 0,04% bis 0,3% Kohlenstoff und 8% bis 20% Chrom aufweist und weiters Anteile von Molybdän, Stickstoff, Mangan und Nickel enthält. Optimale Ergebnisse können erreicht werden, wenn der martensitische, rostfreie Stahl einen Anteil von 0,1% Kohlenstoff und 11,6% Chrom aufweist und weiters Anteile von 0,01% Stickstoff, 0,6% Mangan und 0,2% Nickel enthält.It is particularly advantageous if the martensitic, stainless steel has a proportion of 0.04% to 0.3% carbon and 8% to 20% chromium and also contains proportions of molybdenum, nitrogen, manganese and nickel. Optimal results can be achieved if the martensitic, stainless steel contains 0.1% carbon and 11.6% chromium and also contains 0.01% nitrogen, 0.6% manganese and 0.2% nickel.
Eine Schraube gemäß den Fig. 1 und 2 kann natürlich auch noch einer Oberflächenbehandlung unterzogen werden, wobei gerade eine Passivierung vorteilhaft ist. Es sind aber auch andere Oberflächenbehandlungsmöglichkeiten gegeben.A screw according to FIGS. 1 and 2 can of course also be subjected to a surface treatment, passivation being advantageous. However, there are also other surface treatment options.
Vom Herstellungsverfahren her gesehen ergeben sich verschiedene Möglichkeiten. So ist es denkbar, den Abschnitt 8 vor der Fertigung des Bohrteiles 5 oder nach dessen Fertigung mit dem Abschnitt 7 zu verbinden. Es ist gerade durch die besondere Materialwahl der beiden rostfreien Abschnitte 7 und 8 möglich, vorab eine Härtung des Abschnittes 8 zu bewirken oder aber nach der Verbindung der beiden Abschnitte 7 und 8. Gerade durch den besonderen Kohlenstoffanteil ist es in einfacher Weise möglich geworden, eine Härtung in einem Bandofen durchzuführen, so daß eine industrielle Fertigung großer Massen gewährleistet ist. Ferner ist auch eine induktive Härtung des zweiten Abschnittes 8 durchaus denkbar.There are various possibilities in terms of the manufacturing process. It is thus conceivable to connect section 8 to section 7 before the drilling part 5 is manufactured or after its manufacture. It is precisely because of the special choice of material of the two stainless sections 7 and 8 that it is possible to harden section 8 beforehand or after the two sections 7 and 8 have been joined. It is precisely because of the special carbon content that it is possible to easily achieve one To carry out curing in a belt furnace, so that industrial production of large masses is guaranteed. Furthermore, inductive hardening of the second section 8 is also conceivable.
Die beiden Abschnitte 7 und 8 des Schaftes 2 werden an ihren einander zugewandten Endbereichen (dargestellt durch die Linie 9) miteinander verbunden. Diese Trennebene kann so gelegt werden, daß das Gewinde 6 über beide Abschnitte 7 und 8 geführt wird, so daß also nach der gegenseitigen Verbindung der beiden Abschnitte 7 und 8 das Gewinde erst hergestellt wird. Es ist aber auch denkbar, diesen Verbindungsbereich so vorzusehen, daß beim Abschnitt 8 lediglich der Bohrteil 5 und beim Abschnitt 7 der Schaft 2 mit dem aufgewalzten Gewinde 6 vorhanden ist.The two sections 7 and 8 of the shaft 2 are connected to one another at their mutually facing end regions (represented by the line 9). This parting plane can be placed so that the thread 6 is guided over both sections 7 and 8, so that after the mutual connection of the two sections 7 and 8, the thread is only produced. But it is also conceivable to provide this connection area in such a way that in section 8 only the drilling part 5 and in section 7 the shaft 2 with the rolled thread 6 is present.
Bei der Ausgestaltung nach Fig. 2 ist ersichtlich, daß der Bohrteil 5 als Bohrplättchen ausgebildet ist, welches in einen entsprechenden Schlitz am freien Ende des den Abschnitt 7 bildenden Schaftes 2 eingesetzt und in diesem Schlitz befestigt wird. Es ist somit der gesamte Schaft 2 samt dem Schraubenkopf 3 als Abschnitt 7 anzusehen, wogegen der Abschnitt 8 ausschließlich von dem als Bohrplättchen ausgebildeten Bohrteil 5 gebildet wird. Auch bei einer solchen Konstruktion können die besonderen Vorteile der Materialwahl der beiden Abschnitte 7 und 8 optimal ausgenützt werden.2 it can be seen that the drilling part 5 is designed as a drilling plate which is inserted into a corresponding slot at the free end of the shaft 2 forming the section 7 and fastened in this slot. The entire shaft 2 together with the screw head 3 can thus be regarded as section 7, whereas section 8 is formed exclusively by the drilling part 5 designed as a drilling plate. Even with such a construction, the particular advantages of the choice of material for the two sections 7 and 8 can be optimally used.
Im Rahmen der Erfindung kann ein selbstbohrender Befestiger jeder Art eingesetzt werden, wobei auch bei selbstbohrenden Schrauben 1 keinesfalls ein so großer Schraubenkopf 3 wie in den Fig. 1 und 2 dargestellt vorgesehen werden muß. Es wäre auch denkbar, hier praktisch nur eine Art Schaft 2 vorzusehen, welcher an dem dem Bohrteil 5 abgewandten Ende mit einem Innenwerkzeugangriff versehen ist. Es wäre aber auch möglich, an diesem Ende der Schraube eine Art Zapfen mit Werkzeugangriff vorzusehen, wobei dieser Zapfen in der Außenabmessung gleich oder kleiner als der Gewindeaußendurchmesser ausgeführt ist. Within the scope of the invention, a self-drilling fastener of any kind can be used, although even with self-drilling screws 1, such a large screw head 3 as shown in FIGS. 1 and 2 need not be provided. It would also be conceivable to provide practically only one type of shank 2, which is provided with an internal tool attack at the end facing away from the drilling part 5. However, it would also be possible to provide a type of pin with tool engagement at this end of the screw, the pin of the pin having the outer dimension being equal to or smaller than the outer thread diameter.

Claims

Selbstbohrender Befestiger Self-drilling fastener
1. Selbstbohrender Befestiger aus rostfreiem Stahl mit einem an seinem einen Ende mit einem Werkzeugangriff und an seinem anderen Ende mit einem Bohrteil ausgebildeten Schaft, welcher gegebenenfalls auf einem Teilabschnitt ein Gewinde aufweist, dadurch gekennzeichnet, daß der Schaft aus zwei Abschnitten (7, 8) rostfreien Materials gebildet ist, welche form-, stoff- und/oder kraftschlüssig miteinander verbunden sind, wobei der den Werkzeugangriff (4) und gegebenenfalls einen Gewindebereich aufweisende, erste Abschnitt (7) des Schaftes (2) aus einem rostfreien, rein ferritischen oder austenitischen Stahl oder einem rostfreien Duplexstahl und der zweite, als Bohrteil (5) ausgebildete oder den Bohrteil (5) aufweisende Abschnitt (8) des Schaftes (2) aus einem martensitischen, rostfreien Stahl mit einem Kohlenstoff-Anteil von 0,04% bis 0,3% gebildet ist.1. Self-drilling fastener made of stainless steel with a shaft formed at one end with a tool attack and at the other end with a drilling part, which optionally has a thread on a partial section, characterized in that the shaft consists of two sections (7, 8) Stainless material is formed, which are positively, materially and / or non-positively connected to one another, the first section (7) of the shank (2), which has the tool engagement (4) and optionally a threaded region, made of a rustproof, purely ferritic or austenitic Steel or a duplex stainless steel and the second section (8) of the shaft (2), which is designed as a drilling part (5) or has the drilling part (5), made of a martensitic, stainless steel with a carbon content of 0.04% to 0, 3% is formed.
2. Befestiger nach Anspruch 1 , dadurch gekennzeichnet, daß der zweite Abschnitt (8) in einem Bandofen gehärtet ist.2. Fastener according to claim 1, characterized in that the second section (8) is hardened in a belt furnace.
3. Befestiger nach Anspruch 1 , dadurch gekennzeichnet, daß der zweite Abschnitt (8) induktiv gehärtet ist.3. Fastener according to claim 1, characterized in that the second section (8) is inductively hardened.
4. Befestiger nach Anspruch 1 , dadurch gekennzeichnet, daß der martensitische, rostfreie Stahl einen Anteil von 0,04% bis 0,3% Kohlenstoff und 8% bis 20% Chrom aufweist und weiters Anteile von Molybdän, Stickstoff, Mangan und Nickelt enthält.4. Fastener according to claim 1, characterized in that the martensitic, stainless steel has a proportion of 0.04% to 0.3% carbon and 8% to 20% chromium and further contains proportions of molybdenum, nitrogen, manganese and nickel.
5. Befestiger nach Anspruch 1 , dadurch gekennzeichnet, daß der martensitische, rostfreie Stahl einen Anteil von 0,1% Kohlenstoff und 11 ,6% Chrom aufweist und weiters 0,01% Stickstoff, 0,6% Mangan und 0,2% Nickel enthält.5. Fastener according to claim 1, characterized in that the martensitic, stainless steel has a proportion of 0.1% carbon and 11.6% chromium and further 0.01% nitrogen, 0.6% manganese and 0.2% nickel contains.
6. Befestiger nach Anspruch 1 , dadurch gekennzeichnet, daß der erste und der zweite Abschnitt (7, 8) mittels Schweißen, Löten, Kleben, Fügen, Einpressen oder dergleichen miteinander verbunden sind.6. Fastener according to claim 1, characterized in that the first and the second section (7, 8) are connected to one another by means of welding, soldering, gluing, joining, pressing or the like.
7. Befestiger nach Anspruch 1 und einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß dieser eine Oberflächenbehandlung durch Passivierung aufweist. 7. Fastener according to claim 1 and one of the preceding claims, characterized in that it has a surface treatment by passivation.
EP01962810A 2000-07-10 2001-07-02 Self-tapping fastener Withdrawn EP1299651A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10033471A DE10033471C1 (en) 2000-07-10 2000-07-10 Self-boring screw made from stainless steel used in the building industry has a shaft made from two sections of stainless steel connected together
DE10033471 2000-07-10
PCT/EP2001/007526 WO2002004822A1 (en) 2000-07-10 2001-07-02 Self-tapping fastener

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AU (1) AU2001283912A1 (en)
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WO (1) WO2002004822A1 (en)

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US20030147717A1 (en) 2003-08-07
AU2001283912A1 (en) 2002-01-21
DE10033471C1 (en) 2001-12-06
US6874986B2 (en) 2005-04-05
WO2002004822A1 (en) 2002-01-17

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