DE3909725C1 - Hole- and thread-forming screw - Google Patents
Hole- and thread-forming screwInfo
- Publication number
- DE3909725C1 DE3909725C1 DE3909725A DE3909725A DE3909725C1 DE 3909725 C1 DE3909725 C1 DE 3909725C1 DE 3909725 A DE3909725 A DE 3909725A DE 3909725 A DE3909725 A DE 3909725A DE 3909725 C1 DE3909725 C1 DE 3909725C1
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- DE
- Germany
- Prior art keywords
- hole
- screw
- thread
- diameter
- approximately
- 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 - Fee Related
Links
- 239000002184 metal Substances 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 229910000760 Hardened steel Inorganic materials 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 description 15
- 238000000465 moulding Methods 0.000 description 6
- 230000035515 penetration Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 206010016275 Fear Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000000109 continuous material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000003716 rejuvenation Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Classifications
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- 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
- F16B25/0084—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by geometric details of the tip
-
- 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
- F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
- F16B25/0021—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. sheet-metal or aluminium
-
- 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
- F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
- F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
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- 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
- F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft
-
- 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
- F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
- F16B25/106—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a self-piercing screw-point, i.e. without removing material
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Connection Of Plates (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine loch- und gewindeformende Schraube bis ca. 6 mm Gewindedurchmesser zum Eindrehen in Metallblech einer Dicke bis etwa 1 mm mit einem eine Werk zeugaufnahme aufweisenden Kopf, einem Gewindeschaft und einem daran anschließenden Zylinderteil mit einem unter dem Flankendurchmesser des Gewindeschaftes liegenden Durchmesser, der in ein sich verjüngendes Lochformteil übergeht.The invention relates to a hole and thread forming Screw up to approx. 6 mm thread diameter for screwing in Sheet metal up to 1 mm thick with a single movement tool holder head, a threaded shaft and an adjoining cylinder part with one under the Flank diameter of the threaded shaft lying diameter, which merges into a tapered hole molding.
Eine derartige Schraube ist aus der DE-PS 25 37 446 bekannt. Bei dieser als selbstschneidende Blechschraube bezeichneten Schraube dient der Lochformteil dazu, das die Schraube später aufnehmende Loch durch Zerspanung zu bohren, wozu der Loch formteil in einer ausgeprägten Spitze ausläuft, die die Spitze der Pyramide bildet, deren Kanten der Zerspanung des betreffenden Blechteils dienen. Gemäß Figur 18 dieser Patentschrift ist zwischen dem durchgehenden zylindrisch ausgebildeten Gewindeschaft und dem nach Art einer Pyramide ausgebildeten Lochformteil ein Zylinderteil angeordnet, dessen Durchmesser gleich dem Flankendurchmesser der Gewin degänge oder kleiner ist. Die Aufgabe dieses Zylinderteils besteht darin, das gebohrte Loch an die Zylinderform anzupas sen und dessen Achsrichtung senkrecht zum Loch auszurichten, um den Gewindeschaft ohne Verkantung in das Blech hineinführen zu können.Such a screw is known from DE-PS 25 37 446. In this referred to as self-tapping screw The hole is used to screw the screw later drilling the receiving hole by machining, for which the hole molded part ends in a distinctive tip, which the The top of the pyramid forms the edges of the cutting of the sheet metal part in question. According to Figure 18 this The patent is cylindrical between the continuous trained threaded shaft and that in the manner of a pyramid trained hole molded part arranged a cylinder part, whose diameter is equal to the flank diameter of the thread degrees or less. The task of this cylinder part is to match the drilled hole to the cylinder shape sen and align its axial direction perpendicular to the hole, around the threaded shaft without tilting into the sheet to be able to.
Eine weitere loch- und gewindeformende Schraube ist aus der DE-PS 27 32 695 bekannt. Auch diese Schraube beruht auf dem Prinzip, mit einer scharfen Spitze ihres kegelförmig ausgebil deten Lochformteils zunächst in das Material des Blechs einzudringen und in diesem einen Führungskanal aufzubohren. Der Lochformteil dieser Schraube ist darüber hinaus mit einem Gewindegang großer Steigung versehen, von dem bei weiterem Eindringen der Schraube in das Material des Blechs eine Aufweitung des von der scharfen Spitze zunächst gebohrten Führungskanals bewirkt werden soll, die sich in Form einer Ausstülpung öffnet. Das Gewinde des Gewindeschaftes geht bei dieser Schraube direkt in den Lochformteil über.Another hole and thread forming screw is from the DE-PS 27 32 695 known. This screw is also based on the Principle, with a sharp tip of its conical shape the perforated part first into the material of the sheet to penetrate and drill a guide channel in this. The hole molded part of this screw is also with a Provide thread of large pitch, from which on further Penetration of the screw in the material of the sheet Widening of the one initially drilled by the sharp tip Guide channel should be effected, which is in the form of a The protuberance opens. The thread of the threaded shaft is included this screw directly into the hole molding.
Aufgrund der feinen Zerspanung des Blechmaterials beim Eindrehen der bekannten Schrauben ergeben sich verschiedene Nachteile. Feine Metallspäne setzen sich im Inneren von Gehäusen und dergleichen ab, wo sie z. B. im Fall elektrischer Geräte unerwünschte und gefährliche Kontaktbrücken bilden können. Außerdem lassen sich feine Späne schlecht entfernen und führen insbesondere im Falle des Zutritts von Feuchtigkeit bzw. feuchter Luft zu unerwünschter Korrosion.Due to the fine machining of the sheet material at Screwing in the known screws results in different Disadvantage. Fine metal chips settle inside Housings and the like from where they z. B. in the case of electrical Devices form undesirable and dangerous contact bridges can. In addition, fine chips are difficult to remove and lead especially in the event of ingress of moisture or humid air to undesirable corrosion.
Der Erfindung liegt die Aufgabe zugrunde, die eingangs beschriebene Schraube so zu gestalten, daß das Spanproblem vermieden und ein besonders fester Sitz der eingedrehten Schraube im Metallblech geschaffen wird.The invention is based on the object described screw so that the chip problem avoided and a particularly tight fit of the screwed Screw is created in the metal sheet.
Erfindungsgemäß geschieht dies dadurch, daß der Gewindeschaft über eine sich etwa über vier Gewindegänge erstreckende Verjüngung in den Zylinderteil übergeht, dessen Länge etwa der vierfachen Blechdicke entspricht, das der Lochformteil in einer balligen Reibfläche endet, die einem Radius von etwa 0,5 mm entspricht, und daß die gesamte Schraube einstückig aus vergütetem Stahl mit einer Zugfestigkeit bis etwa 1400 N/mm2 bzw. einsatzgehärtetem Stahl besteht. According to the invention, this is done in that the threaded shaft merges into the cylinder part via a taper extending over approximately four thread turns, the length of which corresponds to approximately four times the sheet thickness, and the hole-shaped part ends in a spherical friction surface which corresponds to a radius of approximately 0.5 mm, and that the entire screw is made in one piece from tempered steel with a tensile strength of up to approximately 1400 N / mm 2 or case-hardened steel.
Die erfindungsgemäße Schraube schafft sich das Loch im Metall blech durch Reibung der balligen Reibfläche gegenüber dem Metallblech, das hierdurch so erhitzt wird, daß das Material in seinen plastischen Bereich überführt wird, in dem es radial so nachgiebig wird, daß sich eine erwünschte Lochauf weitung mit Materialverdrängung zu einer Düse ergibt. Es hat sich dabei ergeben, daß bei einem Radius von ca. 0,5 mm der Balligkeit der Reibfläche sich eine günstige Zentrierfähig keit, ausreichend schnelle Wärmeentwicklung bei hoher Ein dringgeschwindigkeit und guter Wärmefluß durch die Schraube ergeben. In die Düse dringt dann beim weiteren Eindrehen der Schraube deren Zylinderteil ein, womit die Ausformung des Loches mit der Düse beendet ist. Nunmehr greift die Verjüngung des Gewindeschaftes in das Loch ein, wodurch das Muttergewinde in dem Loch ausgeformt wird, was durch die Verjüngung ent sprechend erleichtert wird. Dabei ermöglicht der Zylinderteil gewissermaßen eine Abstufung der Drehzahl der einzudrehenden Schraube, da für das zunächst erfolgende Ausformen des Loches aufgrund von Reibung eine wesentlich höhere Drehzahl als für das Ausformen des Gewindes erforderlich ist. Es wird hierdurch vermieden, daß etwa während des Endes des Ausformvorganges des Loches die Gewindegänge der Verjüngung des Gewindeschaftes bereits greifen müssen.The screw according to the invention creates the hole in the metal by friction of the spherical friction surface against the Metal sheet, which is thereby heated so that the material is transferred into its plastic area in which it becomes so radially flexible that there is a desired hole expansion with material displacement to a nozzle. It has it turns out that at a radius of about 0.5 mm Convolution of the friction surface is a favorable centering ability speed, sufficient rapid heat development at high temperatures penetration speed and good heat flow through the screw surrender. The nozzle then penetrates into the nozzle when it is screwed in further Screw in their cylinder part, whereby the shape of the Hole with the nozzle is finished. Now the rejuvenation takes effect of the threaded shaft into the hole, creating the nut thread is formed in the hole, which ent entails the taper speaking is made easier. The cylinder part enables in a way a gradation of the speed of the to be turned Screw, as for the first molding of the hole due to friction a much higher speed than for it is necessary to form the thread. It will avoided that during the end of the molding process of the hole the threads of the taper of the threaded shaft already have to grab.
Aufgrund dieser erfindungsgemäßen Gestaltung der Schraube ergibt sich ein besonders großes Lösemoment, da die erhitzte Düse am Ende des Eindrehvorganges um den demgegenüber kälteren Gewindeschaft schrumpft. Hierdurch erhält man einen besonders erwünschten Sicherungseffekt für die eingedrehte Schraube.Because of this design of the screw according to the invention there is a particularly large loosening torque since the heated one Nozzle at the end of the screwing process by the colder one Threaded shaft shrinks. This gives you a special one desired securing effect for the screwed-in screw.
Werkzeuge zum Ausformen eines Loches in einem Metallblech, die durch Reibung das Blech erhitzen und durch konische Gestaltung ihrer Vorderseite ein Loch mit düsenartigen Fortsätzen erzeugen, sind z. B. aus der DE-AS 25 52 665 und DE-AS 28 02 229 bekannt. Diese Werkzeuge bestehen aus einem schnell um ihre Achse drehbaren Dorn, der mit einer Zentrierspitze bzw. Dornspitze auf das Blech aufgesetzt wird und das Material des Bleches aufgrund von Reibungshitze so plastifiziert, daß der sich an die Spitze anschließende kegelige Teil des Werkzeugs eine Aufweitung des Lochs bis zum maximalen Durch messer des Kegels bewirken kann, an den sich dann ein zylind rischer Dornteil anschließt. Es ist auch aus der FR-PS 11 89 384 bekannt, die vorderste Stelle eines solchen Kegels abzurunden.Tools for forming a hole in a metal sheet, the heat the sheet by friction and by conical design a hole with nozzle-like extensions on its front generate are z. B. from DE-AS 25 52 665 and DE-AS 28 02 229 known. These tools consist of a quick order its axis rotatable mandrel, which with a centering tip or mandrel tip is placed on the sheet and the material of the sheet due to frictional heat so plasticized that the conical part of the Tool an expansion of the hole up to the maximum through Knife of the cone can then cause a cylinder connecting thorn part. It is also from FR-PS 11 89 384 known, the foremost position of such a cone to round off.
Die Technik dieser Werkzeuge ist bisher auf loch- und gewin deformende Schrauben nicht angewendet worden. Der Grund liegt offenbar darin, daß man befürchtet hat, daß die er hebliche Erwärmung des auf das Blech auftreffenden Werkzeug teils das Werkzeug bis zur Zerstörung gefährdet. Aus diesem Grunde bestehen die in der Praxis bekanntgewordenen Werkzeu ge, sogenannte Fließbohrer, aus warmfesten Werkstoffen, insbesondere Hartmetall. Derartige Werkstoffe kommen sowohl aus Kostengründen als auch aus technischen Gründen für die hier in Rede stehenden Schrauben nicht in Frage, da diese vor allem erheblichen Zugspannungen ausgesetzt werden, für die insbesondere Hartmetall ungeeignet ist. Es hat sich nun gezeigt, daß in Metallbleche, insbesondere Stahlbleche, bis zu einer Dicke von 1 mm, Löcher unter Verwendung eines Lochformteiles mit der erwähnten balligen Reibfläche unter Ausnutzung der dabei entstehenden erheblichen Reibungswärme geformt werden können, wenn für die Schraube als Ganzes ver güteter Stahl mit einer Zugfestigkeit bis etwa 1400 N/mm2 bzw. einsatzgehärteter Stahl verwendet wird. Beide Materialien eignen sich aufgrund ihrer Zugfestigkeit in hohem Maße für die Verwendung als Schrauben. Dabei ergibt sich beim Formen des Loches im Metallblech aufgrund der balligen Reibfläche eine hohe Reibungswärme, die in dem relativ dünnen Metallblech schlecht abfließen kann, so daß sich im Metallblech ein dessen Plastifizierung begünstigender Wärmestau ergibt. Wegen der relativ geringen Dicke des Metallblechs findet dabei praktisch noch keine mechanische Beeinträchtigung der balligen Reibfläche statt, so daß das Loch mit solcher Geschwindigkeit ausgeformt wird, daß die Reibfläche praktisch erhalten bleibt. Selbst wenn dabei die Reibfläche beeinträch tigt wird, so spielt dies für das Eindringen der Schraube praktisch keine Rolle, da mit der Schraube das Formen des Loches nur ein einziges Mal erforderlich ist und anschließend daran die weitgehend problemlose Ausformung des Gewindes erfolgt.The technology of these tools has not yet been applied to hole and thread deforming screws. The reason is apparently that there were fears that the substantial heating of the tool hitting the sheet metal would endanger the tool to the point of destruction. For this reason, the tools become known in practice, so-called flow drills, made of heat-resistant materials, in particular hard metal. Such materials are out of the question, both for reasons of cost and for technical reasons, for the screws in question, since these are primarily exposed to considerable tensile stresses, for which hard metal is particularly unsuitable. It has now been shown that in metal sheets, in particular steel sheets, up to a thickness of 1 mm, holes can be formed using a hole-shaped part with the spherical friction surface mentioned, taking advantage of the resulting considerable frictional heat, if the screw as a whole is tempered Steel with a tensile strength of up to about 1400 N / mm 2 or case-hardened steel is used. Due to their tensile strength, both materials are highly suitable for use as screws. This results in the formation of a hole in the metal sheet due to the spherical friction surface, a high frictional heat, which can flow away poorly in the relatively thin metal sheet, so that there is a heat build-up favoring its plasticization. Because of the relatively small thickness of the metal sheet, there is practically no mechanical impairment of the spherical friction surface, so that the hole is formed at such a speed that the friction surface is practically preserved. Even if the friction surface is affected, this is practically irrelevant for the penetration of the screw, since the screw only needs to be formed once and then the largely problem-free formation of the thread.
Zweckmäßig bildet man den Lochformteil einem Kegel ähnlich aus. Der Kegel sorgt aufgrund seiner Geometrie für eine kontinuierliche Materialförderung sowohl in radialer als auch in axialer Richtung.It is useful to form the perforated part like a cone out. The cone ensures due to its geometry continuous material conveyance in both radial and in the axial direction.
Es kann dabei erwünscht sein, die Reibung der Kegeloberfläche gegenüber dem Material des Blechs zu vermindern, was dadurch erfolgt, daß der Kegel mit mehreren, symmetrisch angeordneten Abflachungen versehen ist, die im Querschnitt kegelig abgerun det ineinander übergehen. Die Verformung des Blechmaterials wird hierdurch erleichtert.It may be desirable to reduce the friction of the surface of the cone decrease compared to the material of the sheet, which thereby takes place that the cone with several, symmetrically arranged Flats are provided, which taper conically in cross section merge into each other. The deformation of the sheet material this will make it easier.
Die Materialumformung läßt sich weiter dadurch erleichtern, daß Kegel und Abflachungen in axialer Abrundung in den Zylinderteil übergehen. Aufgrund der axialen Abrundung ergibt sich bis zum Erreichen des Zylinderteils eine gleichmäßige Aufweitung des umzuformenden Materials und damit ein günstiger Materialfluß. Die Schraube kann daher hinsichtlich ihres Lochformteils zweckmäßig so gestaltet sein, daß der Kegelwinkel im Mittel etwa bei 30° bis 40° liegt.The material forming can be further facilitated by that cones and flats in the axial rounding in the Skip cylinder part. Due to the axial rounding results even until the cylinder part is reached Expansion of the material to be formed and thus a favorable material flow. The screw can therefore regarding its hole molding be appropriately designed so that the Cone angle is about 30 ° to 40 ° on average.
Die Ausbildung der durch plastische Verformung gebildeten Düse ermöglicht es, in die Düse Muttergewinde einer Steigung einzuformen, die wesentlich kleiner ist als die übliche Steigung bei bekannten sogenannten Blechschrauben.The formation of the nozzle formed by plastic deformation allows to thread a pitch into the nut nut form, which is much smaller than the usual Slope in known so-called sheet metal screws.
Die Schraube kann daher zweckmäßig so gestaltet sein, daß die Steigung P des Gewindes in bezug auf dessen Außendurchmesser d der Formel P = 0,15 bis 0,20 d entspricht.The screw can therefore be expedient designed so that the pitch P of the thread in relation to its outer diameter d of the formula P = 0.15 to 0.20 corresponds to d.
Ein Ausführungsbeispiel der Erfindung ist in den Figuren dargestellt. Es zeigtAn embodiment of the invention is in the figures shown. It shows
Fig. 1 die erfindungsgemäße Schraube in Seiten sicht, Fig. 1, the screw according to the invention in view pages,
Fig. 2 einen Schnitt längs der Linie A-A in vergrößertem Maßstab aus Fig. 1, Fig. 2 shows a section along the line AA in an enlarged scale of FIG. 1,
Fig. 3 bis 5 einzelne Phasen des Einformens in ein Metallblech. Fig. 3 to 5 individual phases of molding in a metal sheet.
Die in der Fig. 1 dargestellte Schraube weist den Kopf 1 auf, der hier mit dem Kreuzschlitz 2 versehen ist, der als Werkzeugaufnahme dient. An den Kopf 1 schließt sich der Gewindeschaft 3 an, der an seiner dem Kopf 1 abgewandten Seite die Verjüngung 4 aufweist. Diese Verjüngung erstreckt sich hier über vier Gewindegänge. Es ist natürlich auch möglich, die Anzahl der Gewindegänge geringfügig zu erhöhen oder zu reduzieren. Die Verjüngung ergibt sich dadurch, daß die betreffenden Gewindegänge in ihrem Außendurchmesser abnehmen. Das Gewinde des Gewindeteils 3 ist vorzugsweise gerollt.The screw shown in Fig. 1 has the head 1 , which is provided here with the cross recess 2 , which serves as a tool holder. To the head 1, the threaded shaft 3 connects the facing away from the head 1 side has the taper. 4 This taper extends over four threads. Of course, it is also possible to slightly increase or decrease the number of threads. The tapering results from the fact that the threads in question decrease in their outer diameter. The thread of the threaded part 3 is preferably rolled.
An den Gewindeschaft 3 mit der Verjüngung 4 schließt sich der Zylinderteil 5 an, dessen Durchmesser dem Kerndurchmesser des Gewindeschaftes 3 entspricht. Der Durchmesser des Zylin derteils 5 kann auch geringfügig größer oder kleiner gewählt werden. Er soll jedoch unter dem Flankendurchmesser des Gewindeteils 3 liegen. Die axiale Länge des Zylinderteils 5 entspricht etwa der vierfachen Blechdicke, wenn davon aus gegangen wird, daß die Schraube in zwei Bleche mit einer Dicke von je 1 mm eingebracht werden soll, wobei dann noch zu berücksichtigen ist, daß sich pro Blech eine Ausformung einer Düse ergibt, deren Länge ebenfalls im Bereich von 1 mm liegt.The cylindrical part 5 adjoins the threaded shaft 3 with the taper 4 , the diameter of which corresponds to the core diameter of the threaded shaft 3 . The diameter of the cylinder part 5 can also be selected slightly larger or smaller. However, it should be below the flank diameter of the threaded part 3 . The axial length of the cylinder part 5 corresponds approximately to four times the sheet thickness, if it is assumed that the screw is to be inserted into two sheets with a thickness of 1 mm each, whereby it must also be taken into account that there is a formation of a nozzle per sheet results, whose length is also in the range of 1 mm.
An den Zylinderteil 5 schließt sich der Lochformteil 6 an, der schließlich in der balligen Reibfläche 7 endet, deren Ballig keit einem Radius R von etwa 0,5 mm entspricht.At the cylinder part 5 follows the hole-shaped part 6 , which finally ends in the spherical friction surface 7 , the spherical speed corresponds to a radius R of about 0.5 mm.
Aus Fig. 1 ergibt sich, daß der Lochformteil einem Kegel ähnlich ausgebildet ist, der in axialer Abrundung 9 in den Zylinderteil 5 übergeht.From Fig. 1 it follows that the hole-shaped part is formed similar to a cone which merges into the cylindrical part 5 in the axial rounding 9 .
Aus Fig. 2, die einen Schnitt längs der Linie A-A aus Fig. 1 darstellt, ist ersichtlich, daß längs des Lochform teils 6 vier symmetrische Abflachungen 10 verlaufen, so daß sich gegenüber den Abflachungen 10 schärfere Abrundungen 11 ergeben, die beim Eindrehen des Lochstreifens 6 in ein Metall blech 12 (in Fig. 3 bis 5) dessen Material sowohl radial als auch axial wegdrücken.From Fig. 2, which shows a section along the line AA from Fig. 1, it can be seen that along the hole shape part 6 four symmetrical flats 10 run, so that there are 10 sharper roundings 11 compared to the flats, which when screwing the tape 6 in a metal sheet 12 (in Fig. 3 to 5) whose material both radially and axially push away.
Anhand der Fig. 3, 4 und 5 sei nunmehr das Eindrehen der Schraube in ein Metallblech 12, z. B. ein Stahlblech, er läutert.Referring to Figs. 3, 4 and 5 is now the screw is screwed into a metal sheet 12, for. B. a steel sheet, he explains.
Zunächst wird der Lochformteil 6 mit seiner Reibfläche 7 auf das Blech 12 aufgedrückt und mit einer Drehzahl von ca. 4000 Umdrehungen/min in Drehung versetzt. Es wird dabei davon ausgegangen, daß es sich um ein Metallblech 12 von einer Dicke von 1 mm und eine Schraube mit einem Zylinderteil mit einem Durchmesser von 5 mm handelt. Aufgrund des Druckes der Reibfläche 7 auf das Blech 12 und der hohen Drehzahl ergibt sich zwischen Reibfläche 7 und der berührten Oberfläche des Bleches 12 eine so erhebliche Reibungswärme, daß das Material des Bleches 12 plastifiziert wird, wobei es sowohl in Richtung auf die Schraube als auch von dieser weg ausweicht und schließlich, wie Fig. 4 zeigt, die Düse 13 bildet, die sich sowohl oberhalb als auch unterhalb des Bleches 12 erstreckt. Der Kegelwinkel des Lochformteils 6 beträgt hier 35°. Bei diesem Winkel bilden sich Längen der Düse 13 oberhalb und unterhalb des Bleches 12 aus, die sich derart unterscheiden, daß die Länge unterhalb des Bleches 12 etwa das Doppelte der Länge oberhalb des Bleches 12 ist. Mit demgegenüber abnehmendem Kegelwinkel wird die Länge der Düse 13 unterhalb des Bleches 12 weiterhin gegenüber der Länge oberhalb des Bleches 12 verlängert.First, the perforated part 6 is pressed with its friction surface 7 onto the sheet 12 and set in rotation at a speed of approximately 4000 revolutions / min. It is assumed that it is a metal sheet 12 with a thickness of 1 mm and a screw with a cylinder part with a diameter of 5 mm. Due to the pressure of the friction surface 7 on the plate 12 and the high speed, there is such a considerable frictional heat between the friction surface 7 and the contacted surface of the plate 12 that the material of the plate 12 is plasticized, both in the direction of the screw and evades away from this and finally, as shown in FIG. 4, forms the nozzle 13 , which extends both above and below the sheet 12 . The cone angle of the perforated part 6 here is 35 °. At this angle, lengths of the nozzle 13 form above and below the sheet 12 , which differ in such a way that the length below the sheet 12 is approximately twice the length above the sheet 12 . In contrast, with decreasing cone angle, the length of the nozzle 13 below the sheet 12 is further extended compared to the length above the sheet 12 .
Der Vorgang der plastischen Verformung des Bleches 12 mit der Düse 13 schreitet dann fort, bis die Düse 13 den Zylinder teil 5 erreicht hat, wo dann die Verjüngung 4 des Gewindeteils 3 in die Düse 13 eindringt. Bereits im Bereich der axialen Abrundung 9 ergibt sich für das weitere Eindringen der Schraube ein stark zunehmendes Drehmoment, so daß bei ent sprechend dimensioniertem Antriebsorgan für das Eindreh werkzeug dieses seine Drehzahl verringert und nunmehr die Verjüngung 4 des Gewindeschafts 3 in die Düse 13 eindringt und in dieser das entsprechende Gewinde furcht. Dieser Vorgang führt zu dem weiteren Eindringen des Gewindeschaftes 3 in die Düse 13 (Fig. 5), bis schließlich (nicht dargestellt) die Düse 13 an dem in Fig. 1 dargestellten Kopf 1 anläuft. Die Schraube ist damit vollständig in das Blech 12 mit seiner Düse 13 eingedreht. Der Kopf 1 bildet dabei gegenüber der Düse 13 eine Abdichtung, da diese sich relativ leicht durch die Unterseite des Kopfes 1 verformen läßt und sich an den Kopf entsprechend anpaßt.The process of plastic deformation of the sheet 12 with the nozzle 13 then continues until the nozzle 13 has reached the cylinder part 5 , where then the taper 4 of the threaded part 3 penetrates into the nozzle 13 . Already in the area of the axial rounding 9 there is a strongly increasing torque for the further penetration of the screw, so that when the driving element for the screwing-in tool is dimensioned accordingly, its speed is reduced and now the taper 4 of the threaded shaft 3 penetrates into the nozzle 13 and into this fears the corresponding thread. This process leads to the further penetration of the threaded shaft 3 into the nozzle 13 ( FIG. 5) until finally (not shown) the nozzle 13 starts at the head 1 shown in FIG. 1. The screw is thus completely screwed into the plate 12 with its nozzle 13 . The head 1 forms a seal with respect to the nozzle 13 , since this can be deformed relatively easily through the underside of the head 1 and adapts accordingly to the head.
Claims (6)
Priority Applications (19)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3909725A DE3909725C1 (en) | 1989-03-23 | 1989-03-23 | Hole- and thread-forming screw |
| DE3922684A DE3922684A1 (en) | 1989-03-23 | 1989-07-10 | PUNCHING AND THREADING SCREW |
| ZA902203A ZA902203B (en) | 1989-03-23 | 1990-03-22 | Hole forming and selftapping screw |
| DK90904814.2T DK0464071T3 (en) | 1989-03-23 | 1990-03-23 | Hole and thread forming screw |
| AU52796/90A AU641384B2 (en) | 1989-03-23 | 1990-03-23 | Self-tapping drill screw |
| AT90904814T ATE90425T1 (en) | 1989-03-23 | 1990-03-23 | HOLE AND THREAD FORMING SCREW. |
| HU909400118U HU598U (en) | 1989-03-23 | 1990-03-23 | Self-boring and threading screw |
| EP90904814A EP0464071B1 (en) | 1989-03-23 | 1990-03-23 | Self-tapping drill screw |
| JP2504921A JP2968333B2 (en) | 1989-03-23 | 1990-03-23 | Drill tapping screw |
| HU902809A HUT58876A (en) | 1989-03-23 | 1990-03-23 | Hole- and thread-making screw |
| PCT/EP1990/000476 WO1990011458A1 (en) | 1989-03-23 | 1990-03-23 | Self-tapping drill screw |
| KR1019910701114A KR0148386B1 (en) | 1989-03-23 | 1990-03-23 | Self-tapping drill screw |
| ES199090904814T ES2041176T3 (en) | 1989-03-23 | 1990-03-23 | HOLE AND THREAD CONFORMING SCREW. |
| DE9090904814T DE59001719D1 (en) | 1989-03-23 | 1990-03-23 | HOLE AND THREAD-FORMING SCREW. |
| BR909007245A BR9007245A (en) | 1989-03-23 | 1990-03-23 | SELF-TAPPING SCREW |
| CS901414A CZ281543B6 (en) | 1989-03-23 | 1990-03-23 | Screw for hole and thread forming |
| SU915001811A RU2042056C1 (en) | 1989-03-23 | 1991-09-20 | Screw for making smooth or threaded openings |
| US07/999,584 US5234301A (en) | 1989-03-23 | 1992-12-30 | Hole forming and selftapping screw |
| US08/103,523 US5361478A (en) | 1989-03-23 | 1993-08-09 | Method of inserting a hole forming and selftapping screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3909725A DE3909725C1 (en) | 1989-03-23 | 1989-03-23 | Hole- and thread-forming screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3909725C1 true DE3909725C1 (en) | 1990-09-06 |
Family
ID=6377128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3909725A Expired - Fee Related DE3909725C1 (en) | 1989-03-23 | 1989-03-23 | Hole- and thread-forming screw |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3909725C1 (en) |
| ZA (1) | ZA902203B (en) |
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| US6162001A (en) * | 1995-07-21 | 2000-12-19 | Goodwin; Jerry J. | Anti-cross threading fastener |
| EP1262669A1 (en) * | 2001-05-31 | 2002-12-04 | Hans Schriever GmbH & Co | Self-piercing screw with no formation of chips |
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| US20150000086A1 (en) * | 2013-06-28 | 2015-01-01 | GM Global Technology Operations LLC | Vehicle substrate having a pocket for isolating a fastener |
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| DE102014204292A1 (en) | 2014-03-10 | 2015-09-10 | Bayerische Motoren Werke Aktiengesellschaft | A method for producing a screw-bonded connection using a flow-hole-forming screw, and hereafter produced composite component |
| WO2015173165A1 (en) * | 2014-05-14 | 2015-11-19 | Continental Automotive Gmbh | Assembly having two copper sheets screwed to each other and method for producing said assembly |
| DE102014211093A1 (en) * | 2014-06-11 | 2015-12-17 | Arnold Umformtechnik Gmbh & Co. Kg | Hole and thread forming screw |
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| DE102005054242B4 (en) * | 2005-11-15 | 2020-02-27 | Volkswagen Ag | Method for introducing an auxiliary joining part with a thread-like structure into at least two joining parts arranged one above the other in sections |
| WO2022018204A3 (en) * | 2020-07-23 | 2022-03-10 | Arnold Umformtechnik Gmbh & Co. Kg | Screw, use, method and system |
| EP3680040B1 (en) * | 2017-09-07 | 2022-04-27 | Universidade de Aveiro | Multi-operation friction drilling tool |
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| US6162001A (en) * | 1995-07-21 | 2000-12-19 | Goodwin; Jerry J. | Anti-cross threading fastener |
| EP0822024A1 (en) | 1996-07-29 | 1998-02-04 | Horst D. Klees | Thread coupling manufacturing method, machining apparatus, in particular designed for thermal piercing, screw and its use |
| DE19637969A1 (en) * | 1996-09-18 | 1998-03-26 | Schrauben Betzer Gmbh & Co Kg | Thin sheet tapping screw having tool end and conical tip |
| DE19637969C2 (en) * | 1996-09-18 | 2000-04-27 | Schrauben Betzer Gmbh & Co Kg | Chipless hole and thread forming thin sheet metal screw |
| WO1998023873A1 (en) | 1996-11-25 | 1998-06-04 | Ejot Kunststofftechnik Gmbh & Co. Kg | Holding element and method for mounting leads or pipes |
| DE19716431A1 (en) * | 1997-04-18 | 1998-10-22 | Franz Prof Dr Ing Tikal | Combination tool for deforming plates and profiled sections |
| EP1262669A1 (en) * | 2001-05-31 | 2002-12-04 | Hans Schriever GmbH & Co | Self-piercing screw with no formation of chips |
| DE10258238A1 (en) * | 2002-12-13 | 2004-07-15 | Audi Ag | Self-piercing screw for making a joint, with diameter of the upper cylindrical shaft being smaller than the thread outer diameter |
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| DE102014203274A1 (en) | 2014-02-24 | 2015-08-27 | Bayerische Motoren Werke Aktiengesellschaft | A method for producing a screw-bonded connection using a flow-hole-forming screw, as well as suitable flow-hole-forming screw |
| WO2015135722A1 (en) | 2014-03-10 | 2015-09-17 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing an adhesive screw connection using a flow drill screw, and composite component produced thereby |
| DE102014204292A1 (en) | 2014-03-10 | 2015-09-10 | Bayerische Motoren Werke Aktiengesellschaft | A method for producing a screw-bonded connection using a flow-hole-forming screw, and hereafter produced composite component |
| US10584734B2 (en) | 2014-03-10 | 2020-03-10 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing an adhesive screw connection using a flow drill screw, and composite component produced thereby |
| WO2015173165A1 (en) * | 2014-05-14 | 2015-11-19 | Continental Automotive Gmbh | Assembly having two copper sheets screwed to each other and method for producing said assembly |
| DE102014211093A1 (en) * | 2014-06-11 | 2015-12-17 | Arnold Umformtechnik Gmbh & Co. Kg | Hole and thread forming screw |
| WO2016015970A1 (en) | 2014-07-29 | 2016-02-04 | Bayerische Motoren Werke Aktiengesellschaft | Connection arrangement between a fibre-plastic composite profiled part and a vehicle body frame part and method for producing same |
| DE102014214846A1 (en) | 2014-07-29 | 2016-02-04 | Bayerische Motoren Werke Aktiengesellschaft | Connecting arrangement between a fiber-plastic composite profile part and a body frame part and method for their preparation |
| DE102014214846B4 (en) | 2014-07-29 | 2024-10-02 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing a connecting arrangement between a fiber-plastic composite profile part and a body frame part |
| DE102015008719A1 (en) | 2015-07-06 | 2017-01-12 | Audi Ag | Method for producing a component composite |
| WO2017080983A1 (en) | 2015-11-12 | 2017-05-18 | Arnold Umformtechnik Gmbh & Co. Kg | Thread-forming screw |
| DE102015222281A1 (en) | 2015-11-12 | 2017-05-18 | Arnold Umformtechnik Gmbh & Co. Kg | Thread forming screw |
| US11156248B2 (en) | 2015-11-12 | 2021-10-26 | Arnold Umformtechnik Gmbh & Co. Kg | Thread-forming screw |
| EP3680040B1 (en) * | 2017-09-07 | 2022-04-27 | Universidade de Aveiro | Multi-operation friction drilling tool |
| WO2022018204A3 (en) * | 2020-07-23 | 2022-03-10 | Arnold Umformtechnik Gmbh & Co. Kg | Screw, use, method and system |
| DE102022132885A1 (en) | 2022-12-09 | 2024-06-20 | Böllhoff Verbindungstechnik GmbH | Two-stage joining process, joining connection with a stack of components and joining device therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA902203B (en) | 1991-04-24 |
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