WO2008116582A1 - Self-drilling screw comprising a shank, produced from corrosion-resistant steel, and a hard tip joined thereto - Google Patents
Self-drilling screw comprising a shank, produced from corrosion-resistant steel, and a hard tip joined thereto Download PDFInfo
- Publication number
- WO2008116582A1 WO2008116582A1 PCT/EP2008/002165 EP2008002165W WO2008116582A1 WO 2008116582 A1 WO2008116582 A1 WO 2008116582A1 EP 2008002165 W EP2008002165 W EP 2008002165W WO 2008116582 A1 WO2008116582 A1 WO 2008116582A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tip
- screw
- screw according
- self
- corrosion
- 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.)
- Ceased
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
- 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
-
- 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
Definitions
- the invention relates to a self-tapping screw having a stainless steel shank and a hard tip joined thereto made of an alloyed alloy carbon steel.
- Such a screw is disclosed in DE 195 40 848 A1.
- This screw is described in the cited document as being made of stainless steel, the shaft of which is made of austenitic steel and whose martensitic hardening steel tip is alloyed with a number of possible elements as alloying additive, namely chromium, nickel, molybdenum, titanium, manganese, Sulfur and copper (see there claims 4 and 5).
- a carbon content of less than 0.01% is specified, which means that a larger carbon-hardenable steel is not used for the tip.
- the invention has for its object to provide a screw according to the above-mentioned information, which retains its necessary hardness despite significant increase in temperature during their use, ie when drilling and indenting, and thus can be used without restriction in a wide range. According to the invention, this is achieved in that the tip has an increase in hardness due to the addition of alloy due to heating of the screw occurring during hole forming and resulting tempering.
- the assembly of the two components forming the screw according to the invention namely the corrosion-resistant shaft with the hard tip, can be carried out by known thermal joining methods, in particular by welding or soldering.
- the increase in hardness of the tip when producing the screw is expedient in such a way that after curing the tip is tempered to a maximum of about 480 ° C.
- the tip is expedient that the tip is additionally carburized or carbonitrided.
- the figure shows in a diagram how the hardness of known screws and the screw according to the invention behaves with increasing heating.
- the figure shows a diagram of the course of the hardness of a known screw and the screw according to the invention.
- the respective temperature is shown 0 C, on the ordinate of each setting hardness HRC.
- the line 1 shows the course of the degree of hardness in known screws without the special alloying addition and the line 2 the course of the hardness of the screw according to the invention. It follows that with increasing temperature, the known screw has already lost its original hardness at 350 ° and accordingly is no longer able to drill and furrow with the required effectiveness.
- the line 2 shows the course of the degree of hardness of the screw according to the invention, which initially decreases slightly in use with increasing temperature and increases again in the range of 480 ° C to about 600 ° C (secondary hardness).
- 600 ° C is also the temperature usually reached when drilling and grooving with the screw.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Earth Drilling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Schraube mit selbstfurchendem Gewinde mit einem Schaft aus korrosionsbeständigem Stahl und einer daran gefügten harten Spitze Self-tapping screw with a corrosion-resistant steel shaft and a hard tip attached to it
Die Erfindung bezieht sich auf eine Schraube mit selbstfurchendem Gewinde mit einem Schaft aus korrosionsbeständigem Stahl und einer daran gefügten harten Spitze, die aus einem legierten Kohlenstoffstahl mit Legierungszusatz besteht.The invention relates to a self-tapping screw having a stainless steel shank and a hard tip joined thereto made of an alloyed alloy carbon steel.
Eine derartige Schraube ist in der DE 195 40 848 Al offenbart. Diese Schraube wird in der genannten Druckschrift als aus rostfreiem Stahl bestehend beschrieben, deren Schaft aus austenitischem Stahl besteht und deren aus martensitaushär- tenden Stahl bestehende Spitze als Legierungszusatz eine Reihe von möglichen Elementen zulegiert sind, nämlich Chrom, Nickel, Moledän, Titan, Mangan, Schwefel und Kupfer (siehe dort Ansprüche 4 und 5). Bezüglich der aus martensi- taushärtendem Stahl bestehenden Spitze wird ein Kohlenstoffgehalt von weniger als 0,01 % angegeben, was bedeutet, dass ein durch einen größeren Kohlenstoffgehalt härtbarer Stahl für die Spitze nicht verwendet wird. Beim Herstellen der bekannten Schraube wird die Spitze an den Schraubenschaft angeschmiedet und danach die Schraube bei ca. 475° C ausgelagert (siehe dort Spalte 3, Zeile 25), wobei die Spitze eine Auslagerungshärtung erfährt. Im Allgemeinen dauert eine derartige Auslagerung mehrere Stunden, währenddessen die Temperatur der Auslagerung konstant gehalten wird.Such a screw is disclosed in DE 195 40 848 A1. This screw is described in the cited document as being made of stainless steel, the shaft of which is made of austenitic steel and whose martensitic hardening steel tip is alloyed with a number of possible elements as alloying additive, namely chromium, nickel, molybdenum, titanium, manganese, Sulfur and copper (see there claims 4 and 5). With respect to the martensitic-hardening steel tip, a carbon content of less than 0.01% is specified, which means that a larger carbon-hardenable steel is not used for the tip. When manufacturing the known screw, the tip is forged to the screw shaft and then the screw at about 475 ° C outsourced (see column 3, line 25), the tip undergoes a Auslagerungshärtung. In general, such aging takes several hours, during which time the temperature of the aging is kept constant.
Wenn eine derartige Schraube zum Bohren und zum Gewindefurchen verwendet wird, dann wird die Schraube einer erheblichen Belastung ausgesetzt, die die Schraube normalerweise so stark erwärmt, dass während des Bohrvorganges ein kontinuierlicher Rückgang der Härte der Bohrspitze eintritt. Hierdurch wird die - ? -When such a screw is used for drilling and threading, the screw is subjected to a considerable load which normally heats the screw so strongly that a continuous decrease in the hardness of the drill bit occurs during the drilling process. This will be the -? -
Funktionsfähigkeit und die Verwendbarkeit einer derartigen Schraube erheblich eingeschränkt.Functionality and the usability of such a screw considerably limited.
Weiterhin ist eine selbstbohrende und selbstfurchende Schraube aus rostfreiem Stahl aus der DE 100 33 471 Cl bekannt, deren Schaft aus einem rostfreien auste- nitischen Stahl und deren Bohrspitze aus einem martensiti sehen Stahl mit einem relativ hohen Kohlenstoffanteil besteht, der bis zu 0,3 % reichen kann (siehe Anspruch 1 ). Die Spitze dieser Schraube ist bei deren Verwendung darum besonders gefährdet, weil beim Bohren und Furchen in der Spitze hohe Temperaturen bis max. ca. 600° C entstehen, durch die der vorher gehärtete Kohlenstoffstahl der Spitze seine Härte kontinuierlich verliert. Damit ist der Verwendungsbereich auch dieser Schraube erheblich eingeschränkt, da sie für besonders dicke Bleche und höhere Drehzahlen nur begrenzt einsetzbar ist.Furthermore, a self-drilling and self-tapping screw made of stainless steel is known from DE 100 33 471 C1, whose shaft consists of a stainless austenitic steel and whose drill point consists of a martensitic steel with a relatively high carbon content, which amounts to 0.3%. can range (see claim 1). The tip of this screw is particularly endangered when using it, because when drilling and furrows in the tip high temperatures up to max. 600 ° C, through which the previously hardened carbon steel tip continuously loses its hardness. Thus, the range of use of this screw is considerably limited because it is only limited use for particularly thick sheets and higher speeds.
Der Erfindung liegt die Aufgabe zugrunde, eine Schraube gemäß den eingangs erwähnten Angaben zu schaffen, die bei ihrer Verwendung, also beim Bohren und Einfurchen, ihre notwendige Härte trotz erheblicher Temperaturzunahme behält und damit in einem weiten Bereich uneingeschränkt einsetzbar ist. Erfindungsgemäß geschieht dies dadurch, dass die Spitze durch beim Lochformen erfolgende Erwärmung der Schraube und ein dabei entstehendes Anlassen eine Härtezunahme auf Grund des Legierungszusatzes aufweist.The invention has for its object to provide a screw according to the above-mentioned information, which retains its necessary hardness despite significant increase in temperature during their use, ie when drilling and indenting, and thus can be used without restriction in a wide range. According to the invention, this is achieved in that the tip has an increase in hardness due to the addition of alloy due to heating of the screw occurring during hole forming and resulting tempering.
Als Legierungszusatz kommen folgende Elemente mit bestimmten Gewichtsprozenten in Frage, nämlichAs alloying addition, the following elements with certain weight percent come into question, namely
Vanadium mit 0,1 bis 0,85 Gewichtsprozenten Wolfram mit 0,05 bis 4,0 Gewichtsprozenten und Kobalt mit 0,01 bis 10,0 Gewichtsprozenten.Vanadium with 0.1 to 0.85 weight percent tungsten with 0.05 to 4.0 weight percent and cobalt with 0.01 to 10.0 weight percent.
Aufgrund der Einbeziehung der vorstehend genannten Elemente in einen Legierungszusatz ergibt sich der überraschende Effekt, dass bei der Benutzung der - J -Due to the inclusion of the above-mentioned elements in an alloying addition, there is the surprising effect that in the use of the - J -
Schraube und der damit einhergehenden unvermeidbaren Erwärmung zunächst die Härte der Spitze geringfügig nachlässt, dann aber im Bereich von Temperaturen von 480° C bis ca. 600° C die Spitze ihre ursprüngliche Härte wieder erreicht, womit also die bei den bekannten Schrauben entstehende Unwirksamkeit wegen starker Härteabnahme vollständig vermieden wird.Screw and the associated unavoidable heating initially slightly decreases the hardness of the tip, but then in the range of temperatures from 480 ° C to 600 ° C, the tip reaches its original hardness again, so that resulting from the known screws inefficiency due to strong Hard acceptance is completely avoided.
Es sei ergänzend darauf hingewiesen, dass der Legierungszusatz außer den genannten Elementen natürlich auch weitere bekannte und übliche Stoffe enthalten kann, insbesondere auch diese, die oben im Zusammenhang mit dem Stand der Technik genannt sind, die für die Veredelung von Stahl häufig angewendet werden. Der jeweilige Legierungszusatz enthält dann üblicherweise nicht nur einen oder mehrere der vorstehend angegebenen drei Elemente, sondern darüber hinaus auch noch weitere Stoffe, die sich erfahrungsgemäß günstig hinsichtlich der Korrosionsbeständigkeit und Festigkeit von Stahl auswirken.It should be additionally noted that the alloying addition to the above-mentioned elements, of course, may also contain other known and customary substances, especially those mentioned above in the context of the prior art, which are often used for the finishing of steel. The respective alloying additive then usually contains not only one or more of the above three elements, but also other substances that experience has shown to be beneficial in terms of corrosion resistance and strength of steel.
Das Zusammensetzen der beiden die erfindungsgemäße Schraube bildenden Bestandteile, nämlich des korrosionsbeständigen Schaftes mit der harten Spitze, kann durch bekannte thermische Fügeverfahren, insbesondere durch Schweißen oder Löten, erfolgen.The assembly of the two components forming the screw according to the invention, namely the corrosion-resistant shaft with the hard tip, can be carried out by known thermal joining methods, in particular by welding or soldering.
Bei dem Lochausformen kann es sich um ein Bohren oder ein Lochausweiten handeln, so dass die Spitze eine Bohrspitze oder eine lochausformende Spitze sein kann.The hole forming may be drilling or hole broadening so that the tip may be a drill bit or a hole forming tip.
Die Härtesteigerung der Spitze bei Herstellung der Schraube erfolgt zweckmäßig derart, dass nach dem Härten die Spitze bis maximal ca. 480° C angelassen wird. Um eine weitere Härtesteigerung (Randhärte) der Spitze zu ermöglichen, wird zweckmäßig die Spitze zusätzlich aufgekohlt oder karbonitriert.The increase in hardness of the tip when producing the screw is expedient in such a way that after curing the tip is tempered to a maximum of about 480 ° C. In order to allow a further increase in hardness (edge hardness) of the tip, it is expedient that the tip is additionally carburized or carbonitrided.
Das oben erwähnte Anlassen der Schraube beim Lochausformen ist dann ein zusätzlicher Vorgang, der erst dann eintritt, wenn die Schraube verwendet wird. - A -The above-mentioned starting of the screw in the hole forming is then an additional process that only occurs when the screw is used. - A -
Für das Herstellen der erfindungsgemäßen Schraube lässt sich vorteilhaft ein Verfahren verwenden, bei dem nach Zusammenfugen von Schaft und Spitze die Spitze gehärtet und danach beim Lochausformen und Gewindefurchen durch dabei entstehende Erwärmung angelassen wird.For the production of the screw according to the invention, a method can be advantageously used in which, after the shaft and tip have been joined together, the tip is hardened and then tempered during the hole forming and threading through the resulting heating.
In der Figur ist in einem Diagramm dargestellt, wie sich die Härte von bekannten Schrauben und der erfindungsgemäßen Schraube bei zunehmender Erwärmung verhält.The figure shows in a diagram how the hardness of known screws and the screw according to the invention behaves with increasing heating.
Die Figur zeigt ein Diagramm des Verlaufes der Härte einer bekannten Schraube und der erfindungsgemäßen Schraube. Auf der Abszisse des Diagramms ist die jeweilige Temperatur 0C dargestellt, auf der Ordinate der sich jeweils einstellende Härtegrad HRC. Dabei zeigt die Linie 1 den Verlauf des Härtegrades bei bekann- ten Schrauben ohne den besonderen Legierungszusatz und die Linie 2 den Verlauf der Härte der erfindungsgemäßen Schraube. Daraus ergibt sich, dass mit zunehmender Temperatur die bekannte Schraube bereits bei 350° ihre ursprüngliche Härte verloren hat und demgemäß dann auch nicht mehr in der Lage ist, mit der erforderlichen Effektivität zu bohren und zu furchen. Demgegenüber zeigt die Linie 2 den Verlauf des Härtegrades der erfindungsgemäßen Schraube, der zunächst bei der Benutzung mit zunehmender Temperatur geringfügig abfällt und im Bereich von 480° C bis ca. 600° C wieder ansteigt (Sekundärhärte). Bei max. ca. 600° C liegt auch die beim Bohren und Furchen mit der Schraube üblicherweise erreichte Temperatur. Infolgedessen kann die erfindungsgemäße Schraube die an sie gestellten Anforderungen ohne weiteres auch bei hoher Belastung erfüllen. The figure shows a diagram of the course of the hardness of a known screw and the screw according to the invention. On the abscissa of the diagram, the respective temperature is shown 0 C, on the ordinate of each setting hardness HRC. The line 1 shows the course of the degree of hardness in known screws without the special alloying addition and the line 2 the course of the hardness of the screw according to the invention. It follows that with increasing temperature, the known screw has already lost its original hardness at 350 ° and accordingly is no longer able to drill and furrow with the required effectiveness. In contrast, the line 2 shows the course of the degree of hardness of the screw according to the invention, which initially decreases slightly in use with increasing temperature and increases again in the range of 480 ° C to about 600 ° C (secondary hardness). At max. 600 ° C is also the temperature usually reached when drilling and grooving with the screw. As a result, the screw according to the invention can meet the demands placed on them readily even at high loads.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08734649A EP2126382A1 (en) | 2007-03-26 | 2008-03-18 | Self-drilling screw comprising a shank, produced from corrosion-resistant steel, and a hard tip joined thereto |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007014407.7 | 2007-03-26 | ||
| DE102007014407A DE102007014407A1 (en) | 2007-03-26 | 2007-03-26 | Self-tapping screw with a corrosion-resistant steel shaft and a hard tip attached to it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008116582A1 true WO2008116582A1 (en) | 2008-10-02 |
Family
ID=39530151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/002165 Ceased WO2008116582A1 (en) | 2007-03-26 | 2008-03-18 | Self-drilling screw comprising a shank, produced from corrosion-resistant steel, and a hard tip joined thereto |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2126382A1 (en) |
| DE (1) | DE102007014407A1 (en) |
| WO (1) | WO2008116582A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010055210A1 (en) * | 2010-12-20 | 2012-06-21 | Ejot Gmbh & Co. Kg | Low alloy carbon steel screw and method of making such a screw |
| DE102012215645C5 (en) * | 2012-06-15 | 2021-10-28 | Reisser Schraubentechnik Gmbh | Screw and its uses |
| DE102014211093A1 (en) * | 2014-06-11 | 2015-12-17 | Arnold Umformtechnik Gmbh & Co. Kg | Hole and thread forming screw |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19540848A1 (en) | 1995-10-30 | 1997-05-28 | Hettich Ludwig & Co | Screw and process for its manufacture |
| US20010014262A1 (en) | 1999-11-15 | 2001-08-16 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self-tapping corrosion resistant screw with hardened tip |
| EP1158067A1 (en) * | 2000-05-24 | 2001-11-28 | ALSTOM Power N.V. | Martensitic hardenable heat treatable steel with improved thermal resistance and ductility |
| DE10033471C1 (en) * | 2000-07-10 | 2001-12-06 | Sfs Ind Holding Ag Heerbrugg | Self-drilling fastener |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB703911A (en) * | 1950-07-17 | 1954-02-10 | Heppenstall Co | Alloy of iron, nickel and molybdenum |
| GB753491A (en) * | 1953-07-30 | 1956-07-25 | Heppenstall Co | Improvements in or relating to iron, nickel and molybdenum steel alloy and articles made therefrom |
| US3063310A (en) * | 1959-10-15 | 1962-11-13 | Continental Machines | Metal cutting saw bands and blades and method of making the same |
| DE2757639B2 (en) * | 1977-12-23 | 1980-02-28 | Friedr. Lohmann Gmbh Werk Fuer Spezial- & Edelstaehle, 5810 Witten | High-speed steel alloy |
| DE4411795A1 (en) * | 1994-04-06 | 1995-12-14 | Kugelfischer G Schaefer & Co | Stainless steel for case hardening with nitrogen |
| AT403058B (en) * | 1995-03-23 | 1997-11-25 | Boehler Edelstahl | IRON BASED ALLOY FOR USE AT HIGHER TEMPERATURE AND TOOLS MADE OF THIS ALLOY |
| BR0016258A (en) * | 1999-12-07 | 2002-08-20 | Carburization of high-speed steels, low carbon, low chromium | |
| DE10308470A1 (en) * | 2003-02-20 | 2004-09-02 | Adolf Würth GmbH & Co. KG | Self-drilling screw |
-
2007
- 2007-03-26 DE DE102007014407A patent/DE102007014407A1/en not_active Withdrawn
-
2008
- 2008-03-18 EP EP08734649A patent/EP2126382A1/en not_active Withdrawn
- 2008-03-18 WO PCT/EP2008/002165 patent/WO2008116582A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19540848A1 (en) | 1995-10-30 | 1997-05-28 | Hettich Ludwig & Co | Screw and process for its manufacture |
| US20010014262A1 (en) | 1999-11-15 | 2001-08-16 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self-tapping corrosion resistant screw with hardened tip |
| EP1158067A1 (en) * | 2000-05-24 | 2001-11-28 | ALSTOM Power N.V. | Martensitic hardenable heat treatable steel with improved thermal resistance and ductility |
| DE10033471C1 (en) * | 2000-07-10 | 2001-12-06 | Sfs Ind Holding Ag Heerbrugg | Self-drilling fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007014407A1 (en) | 2008-10-02 |
| EP2126382A1 (en) | 2009-12-02 |
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