WO2012084386A1 - Vis d'ancrage - Google Patents

Vis d'ancrage Download PDF

Info

Publication number
WO2012084386A1
WO2012084386A1 PCT/EP2011/070754 EP2011070754W WO2012084386A1 WO 2012084386 A1 WO2012084386 A1 WO 2012084386A1 EP 2011070754 W EP2011070754 W EP 2011070754W WO 2012084386 A1 WO2012084386 A1 WO 2012084386A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw anchor
hardness
blank
shaft
carbonitriding
Prior art date
Application number
PCT/EP2011/070754
Other languages
German (de)
English (en)
Inventor
Florian WETSCHER
Isaiah Freerksen
Falk Rosenkranz
Ralf Zitzmann
Original Assignee
Hilti Aktiengesellschaft
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 Hilti Aktiengesellschaft filed Critical Hilti Aktiengesellschaft
Publication of WO2012084386A1 publication Critical patent/WO2012084386A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/02—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment
    • 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
    • F16B25/0026—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 hard non-organic material, e.g. stone, concrete or drywall

Definitions

  • the invention relates to a method for producing a screw anchor and a screw anchor, in particular for screwing in concrete.
  • Screw anchors are known from the prior art, which have a threaded shaft.
  • the thread is intended to cut into the wall of a hole in concrete or a similar material, so that an undercut is formed, can be derived directly from the loads (ie without interposed dowels or other components) in the ground. So that the thread of the screw anchor can reliably cut into the concrete, the hardness on the surface of the screw anchor must be on the order of 600 HV or above.
  • a screw anchor made of a low carbon steel is carbonitrided and quenched. In this way, the necessary hardness is achieved. Subsequently, the screw anchor is stress annealed to reduce or eliminate the stresses generated during quenching.
  • the disadvantage of this method is that the boron, which is contained in the steel, causes a high hardness in the core. In particular, a hardness above 330 HV results in the core of the shaft. This hardness leads to a high risk of hydrogen embrittlement.
  • the screw anchor which consists of a low-carbon steel, is carbonitrided and quenched.
  • the blanks are annealed at a comparatively high temperature to lower the hardness of the screw throughout the shank to a uniform value.
  • the tip of the anchor is induction hardened and quenched to achieve the necessary hardness for cutting the thread into the concrete.
  • This method has the disadvantage that it is due to the annealing relatively long and the effort is relatively high overall, since the induction hardening an additional process step is necessary.
  • such a screw anchor is less susceptible to hydrogen embrittlement.
  • the object of the invention is to provide a method for the production of screw anchors for concrete, which is characterized by low process costs and can be produced with the screw anchor, which meet all international approval criteria, have a low risk of hydrogen embrittlement, cut well into concrete and have a high toughness.
  • a method for producing a screw anchor in which initially a blank of Cq22Mn4 is provided.
  • the blank is carbonitrided and then quenched.
  • the blank is cold-formed and provided with a rolled thread before it is carbonitrided. In other words, all mechanical processing steps are performed before the blank is cured.
  • the carbonitriding is carried out at a temperature in the range of 800 ° C to 950 ° C, especially in the range of 860 ° C to 900 ° C.
  • This temperature range has been found to be beneficial for carbon diffusion;
  • complete austenitization of the material takes place in this temperature range without grain growth occurring.
  • flash annealing is performed, preferably performed at a temperature in the range of 200 ° C to 240 ° C.
  • the object of the invention is also achieved by a screw anchor, which is characterized in that is used as the material Cq22Mn4 and in which the hardness of the shaft, measured 0, 1 mm below the surface, above 600 HV.
  • This screw anchor is characterized by a high hardness on the surface, so that the thread of the screw anchor reliably cuts into concrete or similar materials.
  • the screw anchor is not susceptible to hydrogen embrittlement and has high toughness inside the shaft.
  • the hardness of the shaft measured 0, 1 mm below the surface, is above 700 HV. Such hardness increases the cutting performance of the thread in concrete.
  • a hardness in the range of 170 to 250 HV is present in the core. This ensures the desired toughness of the screw anchor.
  • the hardness of the shaft drops rapidly from the outside to the inside below a value of 400 HV, in particular already lies below the surface at a depth of 0.5 mm below this value. This ensures that the shank of the screw anchor has the desired high toughness over most of its cross section.
  • FIG. 1 shows schematically a screw anchor
  • a screw anchor 1 is shown schematically, in particular a concrete screw containing a shaft 2 with a screw head 3, wherein the screw head is designed here as an external hexagon.
  • the shank 2 has an anchoring area 5 which extends from a free front end 4 opposite the screw head 3 over approximately one third to approximately three quarters of the total length of the shank 2.
  • the anchoring region 5 is characterized by threads 6 which extend helically along the longitudinal extent of the anchoring region 5.
  • the material used for the screw anchor is a cold heading steel known as Cq22Mn4. This steel contains the following alloy components:
  • the screw anchor shown in Figure 1 is made in the following manner: In a first step, a blank is provided by cold-forming, which is provided with a rolled thread. This blank is cleaned, in particular dephosphated. Subsequently, the blank is carbonitrided in an oven at a temperature of about 880 ° C, wherein in the atmosphere, a carbon content of 1% is present. Further, nitrogen is continuously supplied with a reaction gas. The entire process takes place under exclusion of air.
  • the screw anchors are quenched and annealed at a temperature of about 220 ° C, i. low-stress annealed.
  • This method results in a very high surface hardness and a fairly low hardness in the core of the shaft.
  • hardnesses of the order of magnitude up to 750 HV are achieved on the surface, while a hardness of preferably below 250 HV is present in the interior of the core.
  • An essential feature of the screw anchor obtained in this way is that the hardness drops very rapidly from the high values at the surface to much lower values. In particular, the hardness drops to a value of less than 400 HV1 at a depth of 0.5 mm below the surface.
  • One such screw anchor combines a very high hardness of the thread with a high toughness inside the shaft.
  • FIG. 2 shows the course of the hardness as a function of the distance from the surface. It can be seen that the hardness drops very quickly and is already at a depth of 0.5 mm below the surface in the order of 400 HV1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention concerne un procédé de production d'une vis d'ancrage (1) qui comprend les étapes suivantes : - fourniture d'une ébauche en Cq22Mn4; - carbonitruration de l'ébauche; - trempe de l'ébauche. L'invention concerne également une vis d'ancrage caractérisée en ce qu'on utilise du Cq22Mn4 comme matériau et en ce que la dureté de la tige, mesurée à 0,1 mm sous la surface, est supérieure à 600 HV.
PCT/EP2011/070754 2010-12-21 2011-11-23 Vis d'ancrage WO2012084386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010063675 DE102010063675A1 (de) 2010-12-21 2010-12-21 Schraubanker
DE102010063675.4 2010-12-21

Publications (1)

Publication Number Publication Date
WO2012084386A1 true WO2012084386A1 (fr) 2012-06-28

Family

ID=45044575

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/070754 WO2012084386A1 (fr) 2010-12-21 2011-11-23 Vis d'ancrage

Country Status (2)

Country Link
DE (1) DE102010063675A1 (fr)
WO (1) WO2012084386A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014040995A1 (fr) * 2012-09-12 2014-03-20 Hilti Aktiengesellschaft Procédé de fabrication d'une vis autotaraudeuse
EP2835542A1 (fr) 2013-08-07 2015-02-11 HILTI Aktiengesellschaft Vis autotaraudeuse
WO2015022049A1 (fr) * 2013-08-13 2015-02-19 Fischerwerke Gmbh & Co. Kg Vis à béton
FR3038354A1 (fr) * 2015-07-03 2017-01-06 Sarl Francois Inglese Piton de suspension
EP4029964A1 (fr) 2021-01-14 2022-07-20 Hilti Aktiengesellschaft Durcissement d'un corps de vis revêtu de zinc

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013206388A1 (de) 2013-04-11 2014-10-16 Hilti Aktiengesellschaft Anker mit Spreizbereich und Schneidgewinde
DE102013206387A1 (de) 2013-04-11 2014-10-16 Hilti Aktiengesellschaft Anker
EP3620673A1 (fr) * 2018-09-10 2020-03-11 fischerwerke GmbH & Co. KG Vis à béton

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001247937A (ja) * 1999-05-21 2001-09-14 Koji Onoe 高強度ねじ及び高強度ねじ用鋼
WO2003046229A1 (fr) * 2001-11-28 2003-06-05 Ejot Verbindungstechnik Gmbh & Co. Kg Element de fixation a base d'acier contenant du carbone et procede permettant de le produire
JP2008144266A (ja) * 2006-11-16 2008-06-26 Koji Onoe 高張力鋼板用タッピンねじ類及びその製造方法

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
DE2531944A1 (de) * 1975-07-17 1977-02-03 Schraubenkombinat Veb Verfahren zur herstellung hochfester kaltformteile
WO1988005991A2 (fr) * 1987-02-18 1988-08-25 Sfs Stadler Ag Dispositif de fixation et son procede de fabrication
DE10315957A1 (de) * 2003-04-08 2004-10-28 Ejot Gmbh & Co. Kg Schraube mit einer partiell gehärteten Funktionsspitze und Verfahren zu ihrer Herstellung
DE102008017821A1 (de) * 2008-04-08 2009-10-22 Continental Automotive Gmbh Befestigungselement und Abgasturbolader mit variabler Turbinengeometrie
EP2168697A1 (fr) * 2008-09-30 2010-03-31 Mage Ag Procédé de fabrication de vis de forage
DE202009011665U1 (de) * 2009-08-27 2009-12-10 Röttgers, Christoph Edelstahl-Bohrschraube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001247937A (ja) * 1999-05-21 2001-09-14 Koji Onoe 高強度ねじ及び高強度ねじ用鋼
WO2003046229A1 (fr) * 2001-11-28 2003-06-05 Ejot Verbindungstechnik Gmbh & Co. Kg Element de fixation a base d'acier contenant du carbone et procede permettant de le produire
JP2008144266A (ja) * 2006-11-16 2008-06-26 Koji Onoe 高張力鋼板用タッピンねじ類及びその製造方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014040995A1 (fr) * 2012-09-12 2014-03-20 Hilti Aktiengesellschaft Procédé de fabrication d'une vis autotaraudeuse
EP2835542A1 (fr) 2013-08-07 2015-02-11 HILTI Aktiengesellschaft Vis autotaraudeuse
WO2015022049A1 (fr) * 2013-08-13 2015-02-19 Fischerwerke Gmbh & Co. Kg Vis à béton
FR3038354A1 (fr) * 2015-07-03 2017-01-06 Sarl Francois Inglese Piton de suspension
EP4029964A1 (fr) 2021-01-14 2022-07-20 Hilti Aktiengesellschaft Durcissement d'un corps de vis revêtu de zinc
WO2022152431A1 (fr) 2021-01-14 2022-07-21 Hilti Aktiengesellschaft Durcissement de corps de vis revêtu de zinc

Also Published As

Publication number Publication date
DE102010063675A1 (de) 2012-06-21

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