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DE102011009599A1 - Method for manufacturing connection between workpieces by hole and thread-forming screw, involves stamping screw with nail-shaped tip in workpiece, and screwing screw into workpiece and another workpiece with sectioned screw thread - Google Patents

Method for manufacturing connection between workpieces by hole and thread-forming screw, involves stamping screw with nail-shaped tip in workpiece, and screwing screw into workpiece and another workpiece with sectioned screw thread Download PDF

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Publication number
DE102011009599A1
DE102011009599A1 DE201110009599 DE102011009599A DE102011009599A1 DE 102011009599 A1 DE102011009599 A1 DE 102011009599A1 DE 201110009599 DE201110009599 DE 201110009599 DE 102011009599 A DE102011009599 A DE 102011009599A DE 102011009599 A1 DE102011009599 A1 DE 102011009599A1
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DE
Germany
Prior art keywords
screw
workpiece
thread
nail
workpieces
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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Withdrawn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
DE201110009599
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German (de)
Inventor
Dipl.-Ing. Schubert Holger
Dr.-Ing. Somasundaram Sushanthan
Dipl.-Ing. Daniel ( FH ) Zauner
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Mercedes Benz Group AG
Original Assignee
Daimler AG
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Publication date
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Priority to DE201110009599 priority Critical patent/DE102011009599A1/en
Publication of DE102011009599A1 publication Critical patent/DE102011009599A1/en
Withdrawn legal-status Critical Current

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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
    • F16B25/001—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
    • F16B25/0084—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
    • F16B25/10—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
    • 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
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread

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

Abstract

The method involves stamping a thread-forming screw (4) with a nail-shaped tip (5) in a workpiece (2) up to a screw thread (6) of the screw. The screw is screwed into the workpiece and another workpiece (3) with the sectioned screw thread, where the screw thread is formed as a metric screw thread. A calibration portion (9) is provided between the nail-shaped tip and the screw thread for aligning and/or feeding the screw, where diameter of the nail-shaped tip and/or the calibration portion is smaller than diameter of the screw thread.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen einer Verbindung zwischen zumindest zwei Werkstücken.The present invention relates to a method for producing a connection between at least two workpieces.

Ein Fügen von Mischbaustrukturen ist generell mit mehreren unterschiedlichen Fügeverfahren möglich. Trotzdem ist den bisher bekannten Verfahren gemein, dass diese bei hochfesten Werkstoffen, wie beispielsweise Stahl, an ihre Grenzen stoßen und in der Regel hohe Prozesszeiten erfordern.A joining of mixed structures is generally possible with several different joining methods. Nevertheless, the previously known methods have in common that they encounter their limits in high-strength materials, such as steel, and usually require high processing times.

Aus der EP 0 464 071 B1 ist eine loch- und gewindeformende Schraube bis ca. 6 mm Gewindedurchmesser zum Eindrehen in Metallblech einer Dicke bis ca. 1 mm mit einem eine Werkzeugaufnahme aufweisenden Kopf bekannt. Die beschriebene Schraube ist darüber hinaus einstückig aus vergütetem Stahl mit einer Zugfestigkeit bis etwa 1400 N/mm2 bzw. einsatzgehärtetem Stahl ausgebildet.From the EP 0 464 071 B1 is a hole and thread-forming screw to about 6 mm thread diameter for screwing in metal sheet thickness of about 1 mm with a tool holder having head known. The screw described is also integrally formed from tempered steel with a tensile strength up to about 1400 N / mm 2 or case-hardened steel.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, ein Verfahren zum Herstellen einer Verbindung zwischen zumindest zwei Werkstücken anzugeben, welches zugleich eine zuverlässige und schnelle Verbindung ermöglicht.The present invention addresses the problem of providing a method for producing a connection between at least two workpieces, which at the same time enables a reliable and fast connection.

Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs 1 gelöst. Vorteilhafte Ausführungsformen sind Gegenstand des abhängigen Anspruchs.This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claim.

Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, zur Verbindung von zumindest zwei unterschiedlichen Werkstücken eine loch- und gewindeformende Schraube einzusetzen, die zunächst mit ihrer nagelförmigen Spitze in das erste Werkstück eingeschlagen wird und zwar bis zu einem Gewindeanfang der Schraube und anschließend mit ihrem schneidenden Gewinde spanlos in die beiden Werkstücke eingedreht wird. Das erfindungsgemäße Verfahren nützt somit Synergieeffekte aus den Verfahren des Bolzensetzens und der Direktverschraubung. Bei diesem Verfahren wird in den miteinander zu verbindenden Werkstücken ein Durchgangsloch durch das Eintreiben der nagelförmigen Spitze realisiert, woraufhin anschließend in diesem Durchgangsloch spanlos ein Muttergewinde gefurcht wird. Dies erfolgt üblicherweise mit den beiden ersten Gewindegängen des Gewindes der loch- und gewindeformenden Schraube, wobei der Gewindedurchmesser selbstverständlich größer ist als ein maximaler Durchmesser der nagelförmigen Spitze. Das Gewinde kann darüber hinaus als metrisches Gewinde ausgebildet sein und dadurch eine vergleichsweise einfache Demontage der Verbindung im Reparaturfall ermöglichen. Mit dem erfindungsgemäßen Verfahren ist insbesondere das Verbinden, das heißt das Fügen, von artverschiedenen Werkstoffen (Mischbauweisen) problemlos möglich, wobei eine einseitige Zugänglichkeit zur Fügestelle ausreichend ist. Durch das Einschlagen der Schraube mit ihrer nagelförmigen Spitze zumindest in das erste Werkstück entfällt zudem ein Vorbohren bzw. Vorlochen, wodurch der Fertigungsprozess der Verbindung wirtschaftlicher und insbesondere mit kürzeren Taktzeiten möglich ist. Von besonderem Vorteil ist ebenfalls, dass eine bisher erforderliche Lochfindung entfällt, wodurch einzuhaltende Toleranzen ebenfalls wegfallen. Mit dem erfindungsgemäßen Verfahren lassen sich darüber hinaus auch hochfeste Stahlwerkstoffe prozesssicher fügen, wobei eine Qualitätsüberwachung beispielsweise durch die Drehmoment-Wegüberwachung bzw. die Drehzahl-Wegüberwachung erfolgen kann.The present invention is based on the general idea to use at least two different workpieces a hole- and thread-forming screw, which is first taken with its nail-shaped tip in the first workpiece and that to a thread start of the screw and then with their cutting thread is screwed without cutting into the two workpieces. The method according to the invention thus exploits synergy effects from the methods of bolt setting and direct screwing. In this method, a through hole is realized in the workpieces to be joined together by the driving of the nail-shaped tip, whereupon subsequently a nut thread is furrowed in this through hole without cutting. This is usually done with the two first threads of the thread of the hole and thread forming screw, the thread diameter is of course greater than a maximum diameter of the nail-shaped tip. The thread can also be designed as a metric thread and thereby allow a comparatively simple disassembly of the connection in case of repair. With the method according to the invention in particular the joining, that is the joining, of different types of materials (mixed construction) is easily possible, with a one-sided accessibility to the joint is sufficient. By turning the screw with its nail-shaped tip at least in the first workpiece also eliminates a pre-drilling or pre-punching, whereby the manufacturing process of the connection is more economical and in particular with shorter cycle times possible. Of particular advantage is also that a previously required hole finding is eliminated, so tolerances to be dropped also eliminated. In addition, high-strength steel materials can be added reliably with the method according to the invention, with quality monitoring being able to take place, for example, by means of the torque path monitoring or the rotational speed path monitoring.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Dabei zeigen, jeweils schematisch:In each case show schematically:

1 eine erfindungsgemäße loch- und gewindeformende Schraube vor dem Eindrehen in zwei miteinander zu verbindende Werkstücke, 1 a hole and thread forming screw according to the invention before screwing into two workpieces to be joined together,

2 die Schraube nach einem Setzprozess, 2 the screw after a setting process,

3 die loch- und gewindeformende Schraube in komplett eingedrehter Stellung. 3 the hole- and thread-forming screw in fully screwed position.

Entsprechend den 1–3, ist ein erfindungsgemäßes Verfahren zum Herstellen einer Verbindung 1 zwischen zumindest zwei Werkstücken 2, 3 mittels einer loch- und gewindeformenden Schraube 4 dargestellt, bei dem die Schraube 4 gemäß der 1 zunächst in Position gebracht, das heißt mit ihrer nagelförmigen Spitze 5 an der Einschlagstelle aufgesetzt wird. Anschließend wird die loch- und gewindeformende Schraube 4 gemäß der 2 in die beiden miteinander zu verbindenden Werkstücke 2, 3 eingeschlagen, was landläufig als Setzprozess bezeichnet wird. Das Einschlagen der Schraube 4 erfolgt dabei bis zu einem Gewindeanfang der Schraube 4. In einem letzten Verfahrensschritt, der gemäß der 3 dargestellt ist, wird die Schraube 4 mit ihrem schneidenden Gewinde 6 spanlos in die beiden miteinander zu verbindenden Werkstücke 2, 3 eingeschraubt. Das Gewinde 6 kann dabei beispielsweise als metrisches Gewinde ausgebildet sein.According to the 1 - 3 , is an inventive method for producing a compound 1 between at least two workpieces 2 . 3 by means of a hole and thread forming screw 4 shown in which the screw 4 according to the 1 initially positioned, that is, with its nail-shaped tip 5 is placed at the point of impact. Subsequently, the hole and thread-forming screw 4 according to the 2 in the two workpieces to be joined together 2 . 3 which is commonly referred to as a setting process. The turning of the screw 4 takes place up to a thread start of the screw 4 , In a final process step, according to of the 3 is shown, the screw is 4 with her cutting thread 6 without cutting into the two workpieces to be joined together 2 . 3 screwed. The thread 6 can be formed for example as a metric thread.

An dem der nagelförmigen Spitze 5 abgewandten Ende weist die loch- und gewindeformende Schraube 4 einen Schraubenkopf 7 auf, der eine Eingriffskontur 8, beispielsweise ein Torx oder einen Inbus, besitzt. Über die Eingriffskontur 8 kann ein Drehmoment auf die Schraube 4 ausgeübt werden. Selbstverständlich ist auch denkbar, dass der Schraubenkopf einen Sechskant oder ähnliches aufweist. Wie der 1 weiter zu entnehmen ist, ist zwischen der nagelförmigen Spitze 5 und dem Gewinde 6 ein Kalibrierabschnitt 9 vorgesehen, der insbesondere zum Ausrichten bzw. Führen der Schraube 4 nach dem Setzen derselben in den Werkstücken 2, 3 dient. Mit dem Schraubenkopf 7 liegt die Schraube 4 in vollkommen eingedrehter Stellung (vgl. 3) am ersten Werkstück 2 an, wobei eventuell durch das Furchen des Gewindes in dem ersten Werkstück 2 auftretende Verwerfungen innerhalb einer unten am Schraubenkopf 7 angeordneten Ringnut 10 aufgenommen werden können.At the nail-shaped tip 5 opposite end has the hole and thread-forming screw 4 a screw head 7 on, which is an engaging contour 8th , for example a Torx or an Allen. About the engagement contour 8th can apply torque to the screw 4 be exercised. Of course, it is also conceivable that the screw head has a hexagon or the like. Again 1 is further apparent, is between the nail-shaped tip 5 and the thread 6 a calibration section 9 provided, in particular for aligning or guiding the screw 4 after setting them in the workpieces 2 . 3 serves. With the screw head 7 is the screw 4 in fully turned position (see. 3 ) on the first workpiece 2 possibly by the furrowing of the thread in the first workpiece 2 occurring faults within a bottom of the screw head 7 arranged annular groove 10 can be included.

Das erfindungsgemäße Verfahren nutzt Synergieeffekte aus den Verfahren des Bolzensetzens und der Direktverschraubung, wobei bei diesem Verfahren ein Vorbohren bzw. Vorlochen und damit ein weiterer Arbeitsschritt entfallen kann. Ein Durchmesser D2 der nagelförmigen Spitze 5 bzw. des Kalibrierabschnitts 9 ist dabei kleiner als ein Durchmesser D1 des Gewindes 6, wodurch das Schneiden bzw. Einfurchen der Schraube in die Werkstücke 2, 3 gewährleistet werden kann. Generell können mit dem erfindungsgemäßen Verfahren unterschiedlichste Werkstücke aus Metall oder Kunststoff, beispielsweise auch aus faserverstärktem Kunststoff, miteinander verbunden werden.The method according to the invention utilizes synergy effects from the methods of bolt setting and direct screwing, in which method pre-drilling or pre-punching and thus a further working step can be dispensed with. A diameter D 2 of the nail-shaped tip 5 or the calibration section 9 is smaller than a diameter D 1 of the thread 6 , whereby the cutting or unraveling of the screw in the workpieces 2 . 3 can be guaranteed. In general, a wide variety of workpieces made of metal or plastic, for example, fiber-reinforced plastic, can be connected to one another using the method according to the invention.

Von besonderem Vorteil bei dem erfindungsgemäßen Verfahren ist zudem, dass die Schraube 4 bei einem Reparaturfall demontiert werden kann.Of particular advantage in the inventive method is also that the screw 4 can be dismantled in case of repair.

Es ist selbstverständlich auch klar, dass mit der erfindungsgemäßen Schraube 4 und dem zugehörigen Verfahren auch mehr als zwei Werkstücke 2, 3 zuverlässig und prozesssicher miteinander verbunden werden können.It is of course also clear that with the screw according to the invention 4 and the associated method, more than two workpieces 2 . 3 Reliable and reliable can be connected to each other.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • EP 0464071 B1 [0003] EP 0464071 B1 [0003]

Claims (2)

Verfahren zum Herstellen einer Verbindung (1) zwischen zumindest zwei Werkstücken (2, 3) mittels einer loch- und gewindeformenden Schraube (4), bei dem – die Schraube (4) zunächst mit einer nagelförmigen Spitze (5) zumindest in das erste Werkstück (2) eingeschlagen wird und zwar bis zu einem Gewindeanfang der Schraube (4), – die Schraube (4) mit ihrem schneidenden Gewinde (6) spanlos in die beiden Werkstücke (2, 3) eingeschraubt wird.Method for establishing a connection ( 1 ) between at least two workpieces ( 2 . 3 ) by means of a hole and thread forming screw ( 4 ), in which - the screw ( 4 ) first with a nail-shaped tip ( 5 ) at least into the first workpiece ( 2 ) is hammered up to a thread start of the screw ( 4 ), - the screw ( 4 ) with its cutting thread ( 6 ) without cutting into the two workpieces ( 2 . 3 ) is screwed. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass für das erste Werkstück (2) Metall oder Kunststoff, insbesondere faserverstärkter Kunststoff, verwendet wird, während für das zweite Werkstück (3) Metall oder Leichtmetall, wie z. B. Stahl oder Aluminium, verwendet wird.Method according to claim 1, characterized in that for the first workpiece ( 2 ) Metal or plastic, in particular fiber-reinforced plastic, is used, while for the second workpiece ( 3 ) Metal or light metal, such as. As steel or aluminum is used.
DE201110009599 2011-01-27 2011-01-27 Method for manufacturing connection between workpieces by hole and thread-forming screw, involves stamping screw with nail-shaped tip in workpiece, and screwing screw into workpiece and another workpiece with sectioned screw thread Withdrawn DE102011009599A1 (en)

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DE201110009599 DE102011009599A1 (en) 2011-01-27 2011-01-27 Method for manufacturing connection between workpieces by hole and thread-forming screw, involves stamping screw with nail-shaped tip in workpiece, and screwing screw into workpiece and another workpiece with sectioned screw thread

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DE201110009599 DE102011009599A1 (en) 2011-01-27 2011-01-27 Method for manufacturing connection between workpieces by hole and thread-forming screw, involves stamping screw with nail-shaped tip in workpiece, and screwing screw into workpiece and another workpiece with sectioned screw thread

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2618010A1 (en) * 2012-01-20 2013-07-24 Profil Verbindungstechnik GmbH & Co. KG A bolt element and a method for the attachment of the bolt element to a component of composite material
DE102015202717A1 (en) * 2015-02-16 2016-08-18 Bayerische Motoren Werke Aktiengesellschaft clip member
DE102012104982B4 (en) * 2012-06-11 2016-11-03 Profil Verbindungstechnik Gmbh & Co. Kg Method for mechanically joining at least one lower and one upper molded part
EP3263920A1 (en) * 2016-06-27 2018-01-03 Arnold Umformtechnik GmbH & Co. KG Joining element and method for joining at least two workpieces
EP4015846A1 (en) * 2020-12-18 2022-06-22 Essence Fastening System (Shanghai) Co., Ltd. A kind of thread rolling screw molten through friction

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464071B1 (en) 1989-03-23 1993-06-09 EJOT Eberhard Jaeger GmbH & Co. KG Self-tapping drill screw

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464071B1 (en) 1989-03-23 1993-06-09 EJOT Eberhard Jaeger GmbH & Co. KG Self-tapping drill screw

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2618010A1 (en) * 2012-01-20 2013-07-24 Profil Verbindungstechnik GmbH & Co. KG A bolt element and a method for the attachment of the bolt element to a component of composite material
CN103233964A (en) * 2012-01-20 2013-08-07 形状连接技术有限公司及两合公司 Bolt element and a method for the attachment of a bolt element to a component of a composite material
US9297405B2 (en) 2012-01-20 2016-03-29 Profil Verbindungstechnik Gmbh & Co., Kg Bolt element and a method for the attachment of a bolt element to a component of a composite material
DE102012104982B4 (en) * 2012-06-11 2016-11-03 Profil Verbindungstechnik Gmbh & Co. Kg Method for mechanically joining at least one lower and one upper molded part
DE102015202717A1 (en) * 2015-02-16 2016-08-18 Bayerische Motoren Werke Aktiengesellschaft clip member
EP3263920A1 (en) * 2016-06-27 2018-01-03 Arnold Umformtechnik GmbH & Co. KG Joining element and method for joining at least two workpieces
US10508676B2 (en) 2016-06-27 2019-12-17 Arnold Umformtechnik Gmbh & Co. Kg Connection element, and method for connecting at least two workplaces
EP4015846A1 (en) * 2020-12-18 2022-06-22 Essence Fastening System (Shanghai) Co., Ltd. A kind of thread rolling screw molten through friction

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