WO2005011892A1 - Screw having an undercut between the thread and the head - Google Patents

Screw having an undercut between the thread and the head Download PDF

Info

Publication number
WO2005011892A1
WO2005011892A1 PCT/DE2004/001470 DE2004001470W WO2005011892A1 WO 2005011892 A1 WO2005011892 A1 WO 2005011892A1 DE 2004001470 W DE2004001470 W DE 2004001470W WO 2005011892 A1 WO2005011892 A1 WO 2005011892A1
Authority
WO
WIPO (PCT)
Prior art keywords
undercut
screw
rolling
thread
head
Prior art date
Application number
PCT/DE2004/001470
Other languages
German (de)
French (fr)
Inventor
Robert Kupczyk
Reinhold Krieg
Josef Esser
Original Assignee
Textron Verbindungstechnik Gmbh & Co. Ohg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Textron Verbindungstechnik Gmbh & Co. Ohg filed Critical Textron Verbindungstechnik Gmbh & Co. Ohg
Priority to DE112004001884T priority Critical patent/DE112004001884D2/en
Publication of WO2005011892A1 publication Critical patent/WO2005011892A1/en

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
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts
    • F16B35/048—Specially-shaped necks

Definitions

  • the present invention relates to a screw with a recess between thread and head and a method for producing such a screw.
  • this undercut is produced by machining processes, usually by turning.
  • the diameter of this undercut is usually below the core diameter of the screw thread.
  • the machined undercut causes a weakening of the dynamic durability of the screw in this area. This is primarily due to the fact that the grain that is created during the non-cutting shaping is destroyed during the machining in this area. In addition, material hardening, which have resulted from the non-cutting shaping during manufacture of the S chraube, destroyed. In addition, the corresponding machining step for producing the undercut leads to additional costs, since this manufacturing step must be carried out on a separate machine.
  • the undercut is produced by rolling or rolling.
  • this object is also achieved by a method for producing a screw with an undercut between the thread and the head, in which the undercut is produced by rolling or rolling.
  • the rolling or rolling of the undercut is carried out simultaneously with the rolling or rolling of the thread or on the same machine as the rolling or rolling of the thread.
  • the undercut is even rolled to further strengthen the rolled area, which surprisingly further improves the fatigue strength of the screw between head and thread. This also improves the static strength.
  • screws according to the invention break during a load test within the thread and not at the undercut.
  • the present invention can be used particularly advantageously if the rolling of the undercut is carried out together with the rolling of the thread. In this way, the production of corresponding screws can be significantly accelerated and cheaper, since both work steps can be carried out simultaneously on the same machine. inventions Accordingly, the strength of the screw is improved and at the same time the manufacturing costs are reduced.
  • FIGURE 1 a screw according to the invention from the side;
  • FIGURE 2 shows a detailed representation of the undercut of the screw according to the invention from FIG. 1;
  • FIGURE 3 another screw according to the invention.
  • FIGURE 4 shows a detail of a screw according to the invention according to FIG. 3.
  • FIGS. 1 to 4 each show a screw 10 with an undercut 12 between a thread 14 and a head 16.
  • the undercut 12 is not produced here by machining processes, but rather by rolling.
  • the undercut is preferably rolled simultaneously and on the same Machine like thread rolling 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Closures For Containers (AREA)

Abstract

The invention relates to a screw (10) having a relief groove (12) between the thread (14) and the head (16), said relief groove (12) being produced by milling or rolling.

Description

Schraube mit Freistich zwischen Gewinde und Kopf Undercut screw between thread and head
Die vorliegende Erfindung betrifft eine Schraube mit Frei- stich zwischen Gewinde und Kopf und ein Verfahren zur Herstellung einer solchen Schraube. Gemäß dem derzeitig üblichen Stand der Technik wird dieser Freistich durch spanabhebende Verfahren, meist durch Drehen hergestellt. Der Durchmesser dieses Freistichs liegt normalerweise unterhalb des Kerndurchmessers des Gewindes der Schraube.The present invention relates to a screw with a recess between thread and head and a method for producing such a screw. According to the current state of the art, this undercut is produced by machining processes, usually by turning. The diameter of this undercut is usually below the core diameter of the screw thread.
Bei diesen Ausführungsformen gemäß dem Stand der Technik wird durch den spanabhebend hergestellten Freistich jedoch eine Schwächung der dynamischen Haltbarkeit der Schraube in diesem Bereich hervorgerufen. Dies beruht in erster Linie darauf, dass der Faserverlauf, der bei der spanlosen Formgebung entsteht, bei der spanabhebenden Bearbeitung in diesem Bereich zerstört wird. Zusätzlich werden Materialverfestigungen, die sich durch die spanlose Formgebung während der Fertigung der Schraube ergeben haben, wieder zerstört. Im Übrigen führt der entsprechende spanabhebende Bearbeitungsschritt zur Herstellung des Freistichs zu zusätzlichen Kosten, da dieser Ferti- gungsschritt auf einer separaten Maschine durchgeführt werden muss .In these embodiments according to the prior art, however, the machined undercut causes a weakening of the dynamic durability of the screw in this area. This is primarily due to the fact that the grain that is created during the non-cutting shaping is destroyed during the machining in this area. In addition, material hardening, which have resulted from the non-cutting shaping during manufacture of the S chraube, destroyed. In addition, the corresponding machining step for producing the undercut leads to additional costs, since this manufacturing step must be carried out on a separate machine.
Es ist daher Aufgabe der vorliegenden Erfindung, eine Schraube zu schaffen, die keine Schwächungszone zwischen Schrauben- köpf und Gewinde aufweist, die daher also bei ansonsten gleichen Eigenschaften höher belastbar ist und gleichzeitig schneller und günstiger herstellbar ist und ein entsprechendes Herstellungsverfahren anzugeben. Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass der Freistich nicht mit spanenden Bearbeitungsvorgängen hergestellt ist.It is therefore an object of the present invention to provide a screw which has no weakened zone between the screw head and thread, which is therefore more resilient with otherwise the same properties and at the same time is quicker and cheaper to produce, and to specify a corresponding manufacturing process. According to the invention, this object is achieved in that the undercut is not produced with machining operations.
Besonders bevorzugt ist es dabei, dass der Freistich durch Walzen oder Rollen hergestellt ist.It is particularly preferred that the undercut is produced by rolling or rolling.
Erfindungsgemäß wird diese Aufgabe auch durch ein Verfahren zum Herstellen einer Schraube mit einem Freistich zwischen dem Gewinde und dem Kopf gelöst, bei dem der Freistich durch Walzen oder Rollen hergestellt wird.According to the invention, this object is also achieved by a method for producing a screw with an undercut between the thread and the head, in which the undercut is produced by rolling or rolling.
Besonders bevorzugt ist es dabei, dass das Walzen oder Rollen des Freistichs gleichzeitig mit dem Walzen oder Rollen des Gewindes oder auf der gleichen Maschine, wie das Walzen oder Rollen des Gewindes, durchgeführt wird.It is particularly preferred that the rolling or rolling of the undercut is carried out simultaneously with the rolling or rolling of the thread or on the same machine as the rolling or rolling of the thread.
Überraschenderweise wird bei der vorliegenden Erfindung durch das Walzen des Freistichs sogar noch eine zusätzliche Verfes- tigung des gewalzten Bereichs erzielt, wodurch die Dauerlastwechselfestigkeit der Schraube zwischen Kopf und Gewinde ü- berraschenderweise weiter verbessert wird. Ebenso wird dadurch die statische Festigkeit verbessert.Surprisingly, in the present invention, the undercut is even rolled to further strengthen the rolled area, which surprisingly further improves the fatigue strength of the screw between head and thread. This also improves the static strength.
Selbst wenn der Durchmesser des gewalzten Freistichs geringer ist als der Kerndurchmesser des Gewindes, brechen erfindungsgemäße Schrauben bei einem Belastungsversuch innerhalb des Gewindes und nicht am Freistich.Even if the diameter of the rolled undercut is less than the core diameter of the thread, screws according to the invention break during a load test within the thread and not at the undercut.
Erfindungsgemäß wird so vermieden, dass eine Schraube mit geschwächtem Kopf geschaffen wird.According to the invention it is avoided that a screw with a weakened head is created.
Besonders vorteilhaft kann die vorliegende Erfindung genutzt werden, wenn das Walzen des Freistichs gemeinsam mit dem Wal- zen des Gewindes ausgeführt wird. Auf diese Weise kann die Herstellung entsprechender Schrauben erheblich beschleunigt und verbilligt werden, da beide Arbeitsschritte gleichzeitig auf der gleichen Maschine durchgeführt werden können. Erfin- dungsgemäß wird also die Festigkeit der Schraube verbessert und gleichzeitig die Herstellkosten gesenkt.The present invention can be used particularly advantageously if the rolling of the undercut is carried out together with the rolling of the thread. In this way, the production of corresponding screws can be significantly accelerated and cheaper, since both work steps can be carried out simultaneously on the same machine. inventions Accordingly, the strength of the screw is improved and at the same time the manufacturing costs are reduced.
Die vorliegende Erfindung wird im Folgenden anhand beigefüg- ten Zeichnungen naher erläutert. Es zeigt:The present invention is explained in more detail below with reference to the attached drawings. It shows:
FIGUR 1 eine erfindungsgemäße Schraube von der Seite;FIGURE 1 a screw according to the invention from the side;
FIGUR 2 eine Detaildarstellung des Freistichs der erfmdungs- gemäßen Schraube der Figur 1;FIGURE 2 shows a detailed representation of the undercut of the screw according to the invention from FIG. 1;
FIGUR 3 eine weitere erfindungsgemäße Schraube undFIGURE 3 another screw according to the invention and
FIGUR 4 ein Detail einer erfindungsgemäßen Schraube gemäß Fi- gur 3.FIGURE 4 shows a detail of a screw according to the invention according to FIG. 3.
Die Figuren 1 bis 4 zeigen jeweils eine Schraube 10 mit einem Freistich 12 zwischen einem Gewinde 14 und einem Kopf 16. Er- fmdungsgemaß ist der Freistich 12 hier nicht mit spanenden Bearbeitungsvorgangen hergestellt, sondern durch Walzen Vorzugsweise erfolgt das Walzen des Freistichs gleichzeitig und auf derselben Maschine wie das Walzen des Gewindes 14. FIGS. 1 to 4 each show a screw 10 with an undercut 12 between a thread 14 and a head 16. According to the invention, the undercut 12 is not produced here by machining processes, but rather by rolling. The undercut is preferably rolled simultaneously and on the same Machine like thread rolling 14.

Claims

PATENTANSPRÜCHE
1. Schraube (10) mit Freistich (12) zwischen Gewinde (14) und Kopf (16), dadurch gekennzeichnet, dass der Freistich (12) nicht mit spanenden Bearbeitungsvorgängen hergestellt wird.1. screw (10) with undercut (12) between thread (14) and head (16), characterized in that the undercut (12) is not produced with machining operations.
2. Schraube nach Anspruch 1, dadurch gekennzeichnet, dass der Freistich (12) durch Walzen oder Rollen hergestellt ist.2. Screw according to claim 1, characterized in that the undercut (12) is produced by rolling or rolling.
3. Verfahren zum Herstellen einer Schraube mit einem Frei- stich zwischen dem Gewinde und dem Kopf, dadurch gekennzeichnet, dass der Freistich durch Walzen oder Rollen hergestellt wird.3. A method for producing a screw with an undercut between the thread and the head, characterized in that the undercut is produced by rolling or rolling.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass das Walzen oder Rollen des Freistichs gleichzeitig mit dem4. The method according to claim 3, characterized in that the rolling or rolling of the undercut simultaneously with the
Walzen oder Rollen des Gewindes oder auf der gleichen Maschine wie das Walzen oder Rollen des Gewindes durchgeführt wird. Rolling or rolling the thread or on the same machine as the rolling or rolling the thread.
PCT/DE2004/001470 2003-07-25 2004-07-08 Screw having an undercut between the thread and the head WO2005011892A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112004001884T DE112004001884D2 (en) 2003-07-25 2004-07-08 Screw with undercut between thread and head.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20311466.3 2003-07-25
DE20311466U DE20311466U1 (en) 2003-07-25 2003-07-25 Undercut screw between thread and head

Publications (1)

Publication Number Publication Date
WO2005011892A1 true WO2005011892A1 (en) 2005-02-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2004/001470 WO2005011892A1 (en) 2003-07-25 2004-07-08 Screw having an undercut between the thread and the head

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DE (2) DE20311466U1 (en)
TW (1) TW200504294A (en)
WO (1) WO2005011892A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015005347A1 (en) * 2013-07-08 2015-01-15 株式会社トープラ Screw component
CN109578416A (en) * 2017-09-25 2019-04-05 加特可株式会社 Bolt and part fixture construction and part fixing means

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2922588B1 (en) * 2007-10-22 2013-11-01 Snecma DISC OR ROTOR DRUM OF A TURBOMACHINE
CN103557219B (en) * 2013-11-13 2015-09-30 东方蓝天钛金科技有限公司 Light bolt fastening piece, its processing method and mould

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204566A (en) * 1978-02-10 1980-05-27 Textron Inc. Screw and captive compression spring fastener assembly
EP0271648A1 (en) * 1986-11-21 1988-06-22 Alfons Knoche System to attach façade panels to a sub-construction
JPH01104434A (en) * 1987-10-19 1989-04-21 Toyota Motor Corp Manufacture of connecting rod bolt
DE9016087U1 (en) * 1990-02-09 1991-03-21 Müller, Roland, 4050 Mönchengladbach screw
JPH04143034A (en) * 1990-10-03 1992-05-18 Toyota Motor Corp Manufacture of tension bolt
US5810670A (en) * 1995-08-08 1998-09-22 Tsuda Kogyo Kabushiki Kaisha Method of manufacturing connector bolt
DE19722310A1 (en) * 1997-05-28 1998-12-03 Jung Pee Wee Kaltform & Rohrbe Cold rolling machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204566A (en) * 1978-02-10 1980-05-27 Textron Inc. Screw and captive compression spring fastener assembly
EP0271648A1 (en) * 1986-11-21 1988-06-22 Alfons Knoche System to attach façade panels to a sub-construction
JPH01104434A (en) * 1987-10-19 1989-04-21 Toyota Motor Corp Manufacture of connecting rod bolt
DE9016087U1 (en) * 1990-02-09 1991-03-21 Müller, Roland, 4050 Mönchengladbach screw
JPH04143034A (en) * 1990-10-03 1992-05-18 Toyota Motor Corp Manufacture of tension bolt
US5810670A (en) * 1995-08-08 1998-09-22 Tsuda Kogyo Kabushiki Kaisha Method of manufacturing connector bolt
DE19722310A1 (en) * 1997-05-28 1998-12-03 Jung Pee Wee Kaltform & Rohrbe Cold rolling machine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 318 (M - 852) 19 July 1989 (1989-07-19) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 422 (M - 1305) 4 September 1992 (1992-09-04) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015005347A1 (en) * 2013-07-08 2015-01-15 株式会社トープラ Screw component
CN105378303A (en) * 2013-07-08 2016-03-02 株式会社托普拉 Screw component
JPWO2015005347A1 (en) * 2013-07-08 2017-03-02 株式会社トープラ Screw parts
US9752609B2 (en) 2013-07-08 2017-09-05 Topura Co., Ltd. Threaded fastener
CN109578416A (en) * 2017-09-25 2019-04-05 加特可株式会社 Bolt and part fixture construction and part fixing means

Also Published As

Publication number Publication date
TW200504294A (en) 2005-02-01
DE20311466U1 (en) 2003-11-13
DE112004001884D2 (en) 2006-06-14

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