WO2008116581A1 - Self-drilling screw - Google Patents
Self-drilling screw Download PDFInfo
- Publication number
- WO2008116581A1 WO2008116581A1 PCT/EP2008/002164 EP2008002164W WO2008116581A1 WO 2008116581 A1 WO2008116581 A1 WO 2008116581A1 EP 2008002164 W EP2008002164 W EP 2008002164W WO 2008116581 A1 WO2008116581 A1 WO 2008116581A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screw
- tip
- screw according
- hardness
- alloying
- Prior art date
Links
- 238000005553 drilling Methods 0.000 title abstract description 7
- 238000005275 alloying Methods 0.000 claims abstract description 13
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 3
- 239000010962 carbon steel Substances 0.000 claims abstract description 3
- 238000005496 tempering Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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
Definitions
- the invention relates to a screw with a self-tapping thread of a hardened alloyed carbon steel with alloying addition and a hard tip.
- the invention is therefore based on the object to provide a screw according to the above-mentioned information, which retains its necessary hardness in spite of considerable 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 by the fact that the tip has an increase in hardness due to the addition of alloy due to the heating of the screw during the hole forming process and the resulting tempering.
- the surprising effect results that, when using the screw and the associated unavoidable heating, the hardness of the tip first decreases slightly, but then in the range of temperatures from 480 ° C. to about 600 ° C the screw and thus the tip reaches its original hardness again, so that the resulting in the known screws inefficiency due to strong hardness decrease is completely avoided.
- the alloying addition to the above-mentioned elements 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 abovementioned three elements, but moreover also other substances which experience has shown to have a favorable effect on the corrosion resistance and strength of steel.
- the hole forming may be drilling or hole broadening so that the tip may be a drill bit or a hole forming tip.
- 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 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.
- line 1 shows the course of the degree of hardness in known screws without the special alloying additive
- 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 about the usual when drilling and grooving with the screw temperature.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a self-drilling screw which is produced from hardened, alloyed carbon steel comprising an alloying additive and which has a hard tip. The hardness of the tip increases owing to the alloying additive when the screw is heated during hole formation and the resulting tempering.
Description
Schraube mit selbstfurchendem Gewinde Self-tapping screw
Die Erfindung bezieht sich auf eine Schraube mit selbstfurchendem Gewinde aus einem gehärteten legierten Kohlenstoffstahl mit Legierungszusatz und einer harten Spitze.The invention relates to a screw with a self-tapping thread of a hardened alloyed carbon steel with alloying addition and a hard tip.
Eine derartige Schraube ist in der DE 103 59 679 B3 beschrieben.Such a screw is described in DE 103 59 679 B3.
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 Bohrvorgangs ein kontinuierlicher Rückgang der Härte eintritt, was sich vor allem im Bereich der Bohrspitze nachteilig auswirkt und die Verwendbarkeit einer derartigen Schraube erheblich einschränkt.If such a screw is used for drilling and threading, then the screw is subjected to a considerable load, which normally heats the screw so strongly that during the drilling process, a continuous decrease in hardness occurs, which has an adverse effect, especially in the area of the drill bit and significantly limits the usability of such a screw.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Schraube gemäß den ein- gangs 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 Här- tezunahme auf Grund des Legierungszusatzes aufweist.The invention is therefore based on the object to provide a screw according to the above-mentioned information, which retains its necessary hardness in spite of considerable 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 by the fact that the tip has an increase in hardness due to the addition of alloy due to the heating of the screw during the hole forming process and the resulting tempering.
Als Legierungszusatz kommen folgende Elemente mit bestimmten Gewichtsprozenten in Frage, nämlich
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.As alloying addition, the following elements with certain weight percent come into question, namely 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 Einbeziehung der vorstehend genannten Elemente in einen Legierungszusatz ergibt sich der überraschende Effekt, dass bei der Benutzung der 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 Schraube und damit die Spitze ihre ursprüngliche Härte wieder erreicht, womit also die bei den bekannten Schrauben entstehende Unwirksamkeit wegen starker Härteabnahme vollständig vermieden wird.Due to the inclusion of the above-mentioned elements in an alloying additive, the surprising effect results that, when using the screw and the associated unavoidable heating, the hardness of the tip first decreases slightly, but then in the range of temperatures from 480 ° C. to about 600 ° C the screw and thus the tip reaches its original hardness again, so that the resulting in the known screws inefficiency due to strong hardness decrease 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 Kor- rosionsbeständigkeit 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 abovementioned three elements, but moreover also other substances which experience has shown to have a favorable effect on the corrosion resistance and strength of steel.
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.
Das oben erwähnte Anlassen der Schraube beim Lochausformen ist dann ein zusätzlicher Vorgang, der erst dann eintritt, wenn die Schraube verwendet wird.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. The above-mentioned starting of the screw in the hole forming is then an additional process that only occurs when the screw is used.
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 bekannten 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 etwa 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. In this case, line 1 shows the course of the degree of hardness in known screws without the special alloying additive and 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. about 600 ° C is about the usual when drilling and grooving with the screw temperature. As a result, the screw according to the invention can meet the demands placed on them readily even at high loads.
Claims
1. Schraube mit selbstfurchendem Gewinde aus einem gehärteten, legierten Kohlenstoffstahl mit Legierungszusatz und einer harten Spitze, dadurch gekennzeichnet, dass die Spitze durch beim Lochausformen erfolgende Erwärmung der Schraube und ein dabei entstehendes Anlassen eine Härtezunahme auf Grund des Legierungszusatzes aufweist.1. Screw with self-tapping thread of a hardened alloyed carbon steel with alloying addition and a hard tip, characterized in that the tip by taking place in the hole forming heating of the screw and a resulting tempering an increase in hardness due to the addition of alloy has.
2. Schraube nach Anspruch 1, dadurch gekennzeichnet, dass der Legierungszusatz Vanadium mit 0,1 bis 0,85 Gewichtsprozenten enthält.2. Screw according to claim 1, characterized in that the alloying additive contains vanadium with 0.1 to 0.85 weight percent.
3. Schraube nach Anspruch 1, dadurch gekennzeichnet, dass der Legierungszusatz Wolfram mit 0,05 bis 4,0 Gewichtsprozenten enthält.3. Screw according to claim 1, characterized in that the alloying additive contains tungsten with 0.05 to 4.0 weight percent.
4. Schraube nach Anspruch 1, dadurch gekennzeichnet, dass der Legierungszusatz Kobalt mit 0,01 bis 10,0 Gewichtsprozenten enthält.4. Screw according to claim 1, characterized in that the alloying additive contains cobalt with 0.01 to 10.0 weight percent.
5. Schraube nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der Legierungszusatz mindestens zwei der Elemente gemäß den Ansprüchen5. Screw according to one of claims 2 to 4, characterized in that the alloying addition at least two of the elements according to claims
2 bis 4 enthält.2 to 4 contains.
6. Schraube nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Spitze eine Bohrspitze ist.6. Screw according to one of claims 1 to 5, characterized in that the tip is a drill bit.
7. Schraube nach einem der Ansprüche 1 bis , dadurch gekennzeichnet, dass die Spitze eine lochausformende Spitze ist.7. Screw according to one of claims 1 to, characterized in that the tip is a hole-forming tip.
8. Verfahren zum Herstellen einer Schraube nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Schraube gehärtet und im Bereich von8. A method for producing a screw according to one of claims 1 to 7, characterized in that the screw is hardened and in the range of
480° C bis 600° C angelassen wird. 480 ° C to 600 ° C is tempered.
9. Verfahren zum Herstellen einer Schraube nach einem der Ansprüche 1 bis9. A method for producing a screw according to one of claims 1 to
8, dadurch gekennzeichnet, dass die Schraube zusätzlich aufgekohlt oder karbonitriert wird.8, characterized in that the screw is additionally carburized or carbonitrided.
10. Verfahren zum Herstellen einer Schraube nach einem der Ansprüche 1 bis10. A method for producing a screw according to one of claims 1 to
9, dadurch gekennzeichnet, dass die Schraube mit Spitze gehärtet und danach beim Lochausformen und Gewindefurchen durch dabei entstehende Erwärmung angelassen wird. 9, characterized in that the screw is hardened with a tip and then tempered during the hole forming and threading by the resulting heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08716615A EP2140153A1 (en) | 2007-03-26 | 2008-03-18 | Self-drilling screw |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007014408A DE102007014408A1 (en) | 2007-03-26 | 2007-03-26 | Self-tapping screw |
| DE102007014408.5 | 2007-03-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008116581A1 true WO2008116581A1 (en) | 2008-10-02 |
Family
ID=39505886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/002164 WO2008116581A1 (en) | 2007-03-26 | 2008-03-18 | Self-drilling screw |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2140153A1 (en) |
| DE (1) | DE102007014408A1 (en) |
| WO (1) | WO2008116581A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003046229A1 (en) * | 2001-11-28 | 2003-06-05 | Ejot Verbindungstechnik Gmbh & Co. Kg | Fastening element made of a carbon-containing steel and method for the production thereof |
| EP1466990A1 (en) | 2003-04-08 | 2004-10-13 | EJOT GmbH & Co. KG | Screw with a partially hardened point and process for making same |
| DE10359679B3 (en) | 2003-12-18 | 2005-02-24 | Ejot Gmbh & Co. Kg | Fixing screw formed by cold rolling consists of a material made from steel having a ferritic structure and further components having a higher carbon content compared with the carbon in the ferrite |
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 DE102007014408A patent/DE102007014408A1/en not_active Withdrawn
-
2008
- 2008-03-18 WO PCT/EP2008/002164 patent/WO2008116581A1/en active Application Filing
- 2008-03-18 EP EP08716615A patent/EP2140153A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003046229A1 (en) * | 2001-11-28 | 2003-06-05 | Ejot Verbindungstechnik Gmbh & Co. Kg | Fastening element made of a carbon-containing steel and method for the production thereof |
| EP1466990A1 (en) | 2003-04-08 | 2004-10-13 | EJOT GmbH & Co. KG | Screw with a partially hardened point and process for making same |
| DE10359679B3 (en) | 2003-12-18 | 2005-02-24 | Ejot Gmbh & Co. Kg | Fixing screw formed by cold rolling consists of a material made from steel having a ferritic structure and further components having a higher carbon content compared with the carbon in the ferrite |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2140153A1 (en) | 2010-01-06 |
| DE102007014408A1 (en) | 2008-10-02 |
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