EP1694878A1 - Vis de fixation formee par laminage a froid comprenant un filetage a rainurage automatique - Google Patents

Vis de fixation formee par laminage a froid comprenant un filetage a rainurage automatique

Info

Publication number
EP1694878A1
EP1694878A1 EP04791045A EP04791045A EP1694878A1 EP 1694878 A1 EP1694878 A1 EP 1694878A1 EP 04791045 A EP04791045 A EP 04791045A EP 04791045 A EP04791045 A EP 04791045A EP 1694878 A1 EP1694878 A1 EP 1694878A1
Authority
EP
European Patent Office
Prior art keywords
percent
screw
weight
maximum
added
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.)
Withdrawn
Application number
EP04791045A
Other languages
German (de)
English (en)
Inventor
Heinrich Friederich
Reinhard Schmoock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ejot GmbH and Co KG
Original Assignee
Ejot GmbH and Co KG
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 Ejot GmbH and Co KG filed Critical Ejot GmbH and Co KG
Publication of EP1694878A1 publication Critical patent/EP1694878A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • 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
    • F16B25/0015—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 a soft organic material, e.g. wood or plastic
    • 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
    • F16B25/0047—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 ridge being characterised by its cross-section in the plane of the shaft axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/027—Rolling of self-tapping screws
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/003—Cementite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars

Definitions

  • the invention relates to a cold-formed fastening screw made of low-alloy carbon steel with a large degree of deformation in accordance with a ratio of outer diameter / core diameter> 1.2 and a ratio of pitch / outer diameter> 0.23 with self-tapping thread for screwing in, in particular in plastics.
  • Such a fastening screw is shown and described, for example, in European Patent 948719.
  • this screw is cold rolled, there is a large degree of deformation, according to the ratio of outer diameter / core diameter given in claim 1 of this patent specification from 1.2 to 1.4 and the ratio of pitch / outer diameter from 0.23 to 0.41.
  • the ratio of outer diameter / core diameter is 1.25 to 1.65 and the ratio of pitch / outer diameter is 0.24 to 0.53.
  • the material of this screw and its manufacturing process, namely cold rolling and tempering, is briefly mentioned in the European patent specification (see column 4, lines 39 to 49).
  • German patent specification 27 54 870 discloses a fastening screw formed by cold rolling, in which there is also a high degree of deformation due to the ratio of outer diameter / core diameter of 1.85 and the ratio of pitch / outer diameter of 0.45.
  • Cold rolling and carbon steel with a carbon content of up to 0.35 percent by weight are mentioned in the document about the manufacturing process of the screw.
  • the screws after cold working are subjected to carbon nitriding to increase the carbon content on the surface of the screw (known application method) and then subjected to direct quenching and a tempering process.
  • carbon nitriding to increase the carbon content on the surface of the screw (known application method)
  • direct quenching and a tempering process On page 5, middle column, it is additionally explained with reference to Figure 4 that the insert-tempered screws have a higher risk of breakage than the screws tempered only to 10.9 quality.
  • the tempering of the screws ie their heating, quenching and tempering, was and is the essential feature of the manufacturing process of such screws.
  • the object of the invention is to improve the strength of the screws discussed at the outset and to simplify their manufacturing process. According to the invention, this is done by a screw material of a screw made of steel with a ferritic structure and other components with a carbon content that is substantially higher than the carbon contained in the ferrite, this mixed structure having a carbon content of max. 0.42 percent by weight and a maximum grain size corresponding to at least 2000 grains / mm, preferably at least 3000 grains / mm, with internal stresses maintained by the cold rolling and maintained.
  • the invention is based above all on the surprising finding that the internal stresses impressed in the screw material during cold rolling, which run axially in the screw, form an axial compressive internal stress (contraction stress), which is used when the screw screwed into a plastic material is loaded in order to be more dynamic Stress on the screw connection (vibrating stress) to increase the fatigue strength of the connection, since the residual compressive stress maintained runs in the opposite direction to the external tensile stresses that occur during operation.
  • This effect of maintaining the impressed residual stresses or compressive residual stresses which has proven to be decisive for the special resistance of the screw according to the invention, results from the deliberate avoidance of subsequent tempering, i.e.
  • parts of spherically molded cementite, lamellar pearlite, bainite or martensite can expediently be used either individually or in combination.
  • the ratio of the carbon content in the ferritic structure and in the other constituents can advantageously be selected at about 1:10.
  • the grain size of the grains plays an important role in that the effect of resistance formation due to the cold deformation is particularly great when the maximum grain size is below a value which is at least 2000 grains / mm, preferably at least 3000 grains mm 2 (DIN EN ISO 643, for USA ASTM E 112).
  • the screw material can advantageously be further improved by admixtures with regard to its strength properties.
  • the following options are available for adding admixtures to the screw material individually or in any combination. These are manganese in 0.6 to 2.0 percent by weight, silicon in a maximum of 1.2 percent by weight, chromium in a maximum of 2 percent by weight, molybdenum in a maximum of 1 percent by weight, vanadium in a maximum of 0.5 percent by weight, boron in a maximum of 0.008 percent by weight, Niobium in a maximum of 0.15 percent by weight and titanium in a maximum of 0.3 percent by weight.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Geometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Transmission Devices (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne une vis de fixation formée par laminage à froid, constituée d'un acier au carbone faiblement allié, présentant un taux de déformation élevé conformément à un rapport diamètre extérieur/diamètre du noyau >1,2, et un rapport pas/diamètre extérieur >0,23, et comprenant un filetage à rainurage automatique pour le vissage, en particulier dans des matériaux plastiques. Le matériau constitutif d'une vis en acier présentant une structure ferritique contient d'autres constituants dont la teneur en carbone est sensiblement plus élevée que le carbone contenu dans le ferrite. Cette structure mélangée présente une teneur en carbone maximum égale à 0,42 % en poids et une grosseur de grain maximale correspondant à au moins 2000 grains/mm2, de préférence à au moins 3000 grains/mm2, des tensions résiduelles étant appliquées et maintenues lors du processus de laminage à froid.
EP04791045A 2003-12-18 2004-10-29 Vis de fixation formee par laminage a froid comprenant un filetage a rainurage automatique Withdrawn EP1694878A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10359679A DE10359679B3 (de) 2003-12-18 2003-12-18 Durch Kaltwalzen geformte Befestigungsschraube mit selbstfurchendem Gewinde
PCT/EP2004/012286 WO2005059193A1 (fr) 2003-12-18 2004-10-29 Vis de fixation formee par laminage a froid comprenant un filetage a rainurage automatique

Publications (1)

Publication Number Publication Date
EP1694878A1 true EP1694878A1 (fr) 2006-08-30

Family

ID=34089317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04791045A Withdrawn EP1694878A1 (fr) 2003-12-18 2004-10-29 Vis de fixation formee par laminage a froid comprenant un filetage a rainurage automatique

Country Status (10)

Country Link
US (1) US20070122251A1 (fr)
EP (1) EP1694878A1 (fr)
JP (1) JP2007521400A (fr)
KR (1) KR20060125811A (fr)
CN (1) CN1894433A (fr)
AU (1) AU2004299568A1 (fr)
BR (1) BRPI0417619A (fr)
DE (1) DE10359679B3 (fr)
MX (1) MXPA06006768A (fr)
WO (1) WO2005059193A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7338243B2 (en) * 2003-02-18 2008-03-04 Toge-Dübel A. Gerhard KG Thread-cutting screw
DE102005011079B4 (de) * 2005-03-08 2019-07-04 Schraubenfabrik W. Rüggeberg GmbH Befestigungsschraube zum Einschrauben in Kunststoff
DE102007014408A1 (de) 2007-03-26 2008-10-02 Ejot Baubefestigungen Gmbh Schraube mit selbstfurchendem Gewinde
DE102007029255A1 (de) * 2007-06-15 2008-12-18 Würth, Adolf Schraube und ihre Verwendung
US20100143067A1 (en) * 2008-11-03 2010-06-10 Powers Fasteners, Inc. Anchor bolt and method for making same
DE102010055210A1 (de) * 2010-12-20 2012-06-21 Ejot Gmbh & Co. Kg Schraube aus niedrig legiertem Kohlenstoffstahl und Verfahren zur Herstellung einer derartigen Schraube
DE102013210476C5 (de) * 2013-06-04 2021-04-29 Baier & Michels Gmbh & Co. Kg Verfahren zur Herstellung einer Schraube, insbesondere zur Verwendung in Kunststoffbauteilen
US20150037198A1 (en) * 2013-07-30 2015-02-05 Caterpillar Inc. Wear resistant high toughness steel

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892602A (en) * 1972-04-10 1975-07-01 Bethlehem Steel Corp As-worked, heat treated cold-workable hypoeutectoid steel
DE2754870C3 (de) * 1977-12-09 1981-03-19 Eberhard Jaeger Gmbh & Co Kg, 5928 Laasphe Selbstfurchende Schraube
FR2525709B1 (fr) * 1982-04-22 1986-04-04 Ugine Aciers Vis et boulons en acier a hautes caracteristiques mecaniques et procede d'elaboration de ces vis et boulons
DD231950A3 (de) * 1983-09-09 1986-01-15 Florin Stahl Walzwerk Verfahren zur herstellung hochfester normteile aus kaltstauchstahl
DD272973C2 (de) * 1987-07-31 1990-10-24 Brandenburg Stahl Walzwerk Verfahren zur herstellung hochfester normteile mit verbesserten physikalisch-mechanischen eigenschaften
JP2731797B2 (ja) * 1988-12-20 1998-03-25 トーア・スチール株式会社 非調質ボルト用鋼線材の製造方法
KR20000068651A (ko) * 1997-07-29 2000-11-25 코헤르샤이트 크리스챤 에프. 나사홈 형성 나삿니를 갖춘 조임 나사
JP2001011575A (ja) * 1999-06-30 2001-01-16 Nippon Steel Corp 冷間加工性に優れた機械構造用棒鋼・鋼線及びその製造方法
JP4435953B2 (ja) * 1999-12-24 2010-03-24 新日本製鐵株式会社 冷間鍛造用棒線材とその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005059193A1 *

Also Published As

Publication number Publication date
AU2004299568A1 (en) 2005-06-30
CN1894433A (zh) 2007-01-10
DE10359679B3 (de) 2005-02-24
WO2005059193A1 (fr) 2005-06-30
KR20060125811A (ko) 2006-12-06
BRPI0417619A (pt) 2007-04-10
MXPA06006768A (es) 2006-12-19
JP2007521400A (ja) 2007-08-02
US20070122251A1 (en) 2007-05-31

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