WO2010139608A1 - Vis auto-taraudeuse - Google Patents

Vis auto-taraudeuse Download PDF

Info

Publication number
WO2010139608A1
WO2010139608A1 PCT/EP2010/057371 EP2010057371W WO2010139608A1 WO 2010139608 A1 WO2010139608 A1 WO 2010139608A1 EP 2010057371 W EP2010057371 W EP 2010057371W WO 2010139608 A1 WO2010139608 A1 WO 2010139608A1
Authority
WO
WIPO (PCT)
Prior art keywords
drilling
self
wings
cutting edge
core
Prior art date
Application number
PCT/EP2010/057371
Other languages
German (de)
English (en)
Inventor
Marc Comoth
Original Assignee
Sfs Intec Holding Ag
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 Sfs Intec Holding Ag filed Critical Sfs Intec Holding Ag
Publication of WO2010139608A1 publication Critical patent/WO2010139608A1/fr

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
    • 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
    • F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
    • 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
    • F16B25/0031—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 screw being designed to be screwed into different materials, e.g. a layered structure or through metallic and wooden parts
    • 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
    • F16B25/0089—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw the screw having wings

Definitions

  • the present invention relates to a self-tapping screw consisting of at least one drive, a threaded and a drilling member having one or more transverse to the screw axis cantilevered (n) wings or lobes on the drilling part, whose or the drill bit facing boundary as a cutting edge is formed or are.
  • a self-drilling screw with wings is known from EP 0 049 218 A2.
  • the wings are mounted in the front of the drill screw so that they widen the borehole before the thread. This ensures that, when drilling in a first, softer material, the chips generated are not trapped between the wellbore and the thread, unnecessarily heating the thread, which could result in failure of the thread in a second, harder material.
  • the screw In the second, hardened material, the screw must, after drilling, mold the thread of the hole and make a secure attachment. For this it is necessary that the wings break off before drilling in this material and only the core diameter of the drilling part is drilled.
  • This canceling the wings is previously ensured by a strike shock.
  • the wings are mounted behind the drill bit so that the core drilling diameter is first drilled and the drill bit "falls through” the hole created and the wings hit the edge of the hole before the thread starts.
  • the wings meet at least with the required for drilling Drilling pressure on.
  • a strike shock is triggered in the wings, through which the wings are broken off.
  • a disadvantage of this type of wing assembly is that the drilling pressure is dependent on the person who sets this screw. Especially experienced people tend to reduce the drilling pressure prior to drilling, which also reduces the penetration shock.
  • a process-reliable breaking off of the wings is thus no longer guaranteed. It may happen that one or more wings do not break or do not break properly and a too large core diameter is drilled. The thread can thus no longer be formed correctly. The screw can not be tightened or insufficiently tightened.
  • the object of the invention is to make a self-drilling screw with wings so that the wings break free of shock shock process reliable.
  • a self-tapping screw of the type mentioned in the present invention characterized in that the cutting edge extends at least partially axially at least in the region of the height of the core drill cone.
  • a first shock is provoked with the inventive arrangement of the wing, a first shock.
  • the initial shock is triggered by the fact that before or during the Kernlochbohrvorgangs the or each wing impinges on the harder material and shock-like a torsional moment acts on the wing.
  • the blade or blades
  • the drilling of a hole with the core drilling diameter having part takes place the boring part, which has the optimum diameter for the thread.
  • chip removal is also improved.
  • the drilling part can be used over the entire length of the drilling flood, the space available for the chips, for drilling, for example, a metal carrier.
  • the cutting edge of the or each blade terminates in a tip which is outside the outer diameter of the threaded portion, it is achieved that when drilling with the wings, a clearance between the thread and the borehole is created , In this clearance, the drill cuttings are led out of the bore. Heating of the thread by the friction on the bore wall or by the chips is prevented. Before forming the thread in the harder material so the threads are not unnecessarily heated or already exposed to wear due to friction.
  • the tip of the cutting edge at least approximately determines the Aufbohr tellmesser.
  • the cutting edge tip is thus far away from the screw axis as far as possible. This achieves a maximum breaking moment of the blade, which in turn increases process reliability. At the same time a clearer defined breaking edge is formed.
  • the or each wing has a predetermined breaking point, which is within a virtual cylinder whose diameter corresponds to the core diameter of the boring, it is achieved that the core diameter only by the main cutting edge (s) of the Drilling part is determined.
  • a predetermined breaking point which is within a virtual cylinder whose diameter corresponds to the core diameter of the boring.
  • the predetermined breaking point has a maximum length corresponding to the core drill diameter
  • the maximum breaking moment of the or each blade is decisively determined.
  • the length of the wings also determines the heat development on the outside of the wings when drilling on the Aufbohr matmesser. Shorter wing lengths also improve the chip flow. Ideally, therefore, the length of the wings corresponds maximally to the core drill diameter.
  • the boring part is a chewed or milled boring part with wings.
  • the drilling part and the geometry of the or each blade can be determined by a pinching tool.
  • the Zwickbacken can be adjusted in addition to the optimal main cutting edge and the optimum thickness of the predetermined breaking point.
  • the drilling part is a drilling plate with a drill bit and wings.
  • an embodiment with one of a different material than the rest Screw produced drilling plate can solve the task.
  • a punching tool can determine the shape of the drill plate and the wings.
  • the self-drilling screw for a connection of wood to metal.
  • Inventive screws are particularly suitable for attachment of a first, soft material such as wood od.
  • a second, harder material such as steel.
  • the soft material is drilled with the Aufbohr matmesser, which is determined by the wings, whereupon then at or before drilling in the harder material, but in any case before reaching the Kernbohr malmessers the wings are aborted at the drilling part, so before a puncture shock can occur.
  • the harder material is then bored finished on the core drill diameter and then provided with the help of the threaded part with a counter-thread.
  • soft material is clamped between the harder material and the drive part, which usually has a head, when the screw is tightened.
  • FIG. 1 is a side view of a first embodiment of a self-drilling screw according to the invention, 2 as a detail in an enlarged view of the drilling part and a part of the threaded part of the screw according to Fig. 1,
  • FIG. 5 shows a fourth embodiment of a self-drilling screw according to the invention with a drilling part, which is a drilling plate with a drill bit and wings,
  • Fig. 7-9 shows a bore course with a self-drilling screw according to the invention, which corresponds to the first embodiment thereof.
  • Fig. 1 shows a first embodiment of a self-tapping screw according to the invention, which is indicated generally at 10.
  • the self-tapping screw 10 is in the embodiment shown here and described from a drive part 20, a threaded portion 30 and a boring portion 40.
  • the thread of the threaded portion 30 is a self-tapping thread.
  • the self-drilling screw 40 On the drilling part 40, the self-drilling screw 40 has two wings or lobes cantilevered transversely to the screw axis 12 (hereinafter referred to as wings), which are each designated 42.
  • the drill part 40 has at its free end a drill bit 44 with a blunt-angled drill core cutting edge 46.
  • the drill bit 44 facing the boundary of each blade 42 is formed as a cutting edge 48.
  • the main cutting edge 46 and the drill bit 44 comprehensive part of the drilling part 40 at the free end thereof forms a Kernbohrkonus 50, the designated in Fig. 2 with S. Height.
  • the cutting edge of each blade 42 terminates in a tip 49 which is outside the outer diameter of the threaded portion 30 indicated by Dg.
  • the cutting edge 48 of each blade 42 is above the height S to the drilling part 40 and extends in the first embodiment of the self-tapping screw 10 according to FIGS. 1 and 2 axially in the range of the height S of the core drilling 50.
  • the side of the wing 42, with which this is connected to the drilling part 40 so not zoom up to the Kernbohrkonus 50 zoom.
  • each wing with the said side reaches up to the core drilling cone 50 zoom.
  • the second and the third embodiment differ in particular in that the cutting edges 48 of the wings 42 are angled differently against the screw axis 12, so that the cutting edges 48 in Fig. 3 in the range of the height S of the Kernbohrkonus 50 rich, whereas the cutting edges 48th in Fig. 4 extend axially beyond the height S and thus beyond the drill bit 44 addition.
  • the wings 42 will abort accordingly in the embodiments of FIGS. 3 and 4, after or before the drill bit 44 has started drilling the core hole.
  • the tip 49 of the cutting edge 48 of each blade 42 determines at least approximately the Aufbohr malmesser 110 of the self-tapping screw 10.
  • the radial distance of the tip 49 of the cutting edge 48 is decisive for the mounting diameter 110, because the wings 42 are formed so that their maximum radial distance from the screw axis 12 is not greater than the radial distance of the wings 42 from the screw axis 12.
  • the outer sides of the wings are parallel to the screw axis 12.
  • the wings 42 On its inner side, with which the wings 42 are respectively attached to the drilling part 40, in particular formed, the wings 42 each have a predetermined breaking point 47, as it is indicated by way of example in the illustration in Fig. 4 left.
  • the predetermined breaking points 47 lie in the boring part 40 within a virtual cylinder whose diameter corresponds to the core boring diameter 100 (FIG. 2) of the boring part 40. This ensures that the core drill diameter 100 is determined solely by the main cutting edge 46 of the drilling part 40.
  • the wings 42 will break away so that the core bore diameter 100 is not increased. In Fig. 9, which will be discussed in more detail below, this can be seen.
  • Each predetermined breaking point 47 has a maximum length corresponding to the core drill diameter 100. As a result, the breaking torque required to break off a wing 42 is limited to a suitably low value.
  • the boring member 40 is each a chipped or milled boring member having vanes 42.
  • the boring member 40 may be referred to as a boring plate 60 having a drill bit 44 and vanes 42 may be formed, as shown in Figs. 5 and 6.
  • the self-tapping screw 10 'shown in FIGS. 5 and 6 terminates at the end opposite the driving part 20 in a shaft part 52 which has a non-threaded cylindrical part 52a and a non-threaded frusto-conical part 52b , At the free end of the shaft portion 52, a slot 54 is present, in which a platelet-shaped bore member, namely the drill plate 60 is inserted.
  • the drill plate 60 has at its free end the drill bit 44 with the obtuse drill or Main cutting edge 46.
  • the self-tapping screw 10 ' like the self-tapping screw 10, may be made of stainless steel or other metal.
  • the drill plate 60 is made of a drill steel or a hard metal, so that even steels highest strength can be easily pierced.
  • the drill bit 44 facing the boundaries of the wings 42 are formed as cutting edges 48.
  • the core bore diameter 100 of the drill plate 60 is measured at its largest diameter location. It does not include the wings 42 because they will have already broken off when the drilling plate 60 drills the core hole.
  • the wings 42 lie in a plane with the drill plate 60. At the junction of the wings 42 on the drill plate 60 is an approximately parallel to the screw axis 12 extending predetermined breaking point 47 is present.
  • FIGS. 7-9 show a bore course with a self-drilling screw 10, which corresponds to the first embodiment according to FIGS. 1 and 2.
  • FIG. 7 shows the drilling phase in a softer layer 64, which may be wood by way of example.
  • the wings 42 expand the core hole created by the main cutting edge 46 in the softer layer 64 so that the thread attached to the threaded portion 30 is free in a drilling opening 68.
  • a drilling opening 70 is produced in a second, harder layer 66, which consists in particular of metal, which is in an initial stage in FIG. 8.
  • the wings 42 are mounted on the drilling member 40 so that immediately after the penetration of the drill bit 44 in the harder layer 66, the wings 42 cancel. Upon impact of the wings 42 on the harder layer 66, the wings 42 are loaded so high that they break off. Now, as shown in Fig. 9, the harder layer 66 is completely pierced, a mating thread in the harder layer 66 formed by the self-tapping thread of the self-tapping screw 10 and tightened the screw. By tightening the self-drilling screw 10, the softer layer 64 between the harder layer 66 and the drive part 20 of the screw 10 is clamped. LIST OF REFERENCE NUMBERS

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne une vis auto-taraudeuse, comprenant une partie d'entraînement, une partie de filetage (30), une partie de perçage (40) et deux ailettes (42) en saillie sur la partie de perçage (40) transversalement à l'axe de vis (12). La délimitation, côté la pointe de perçage (44), de chaque ailette (42) est conçue sous forme d'une arête de coupe (48). La vis présente sur sa lame principale (46) un cône de perçage (50) d'une hauteur (S). L'arête de coupe (48) de chaque ailette (42) s'étend au moins en partie axialement jusqu'au moins dans la zone de la hauteur (S) du cône de perçage (50). Les ailettes (42) percent dans une couche plus souple un trou d'un diamètre de perçage (110). Pendant ou avant que la pointe de perçage (44) commence à effectuer une perforation dans une couche plus dure adjacente, les ailettes (42) rencontrent la couche plus dure et cassent. Pour éviter que les ailettes (42) ne subissent un choc de perforation qui surviendrait si les ailettes (42) étaient disposées à une distance axiale de la pointe de perçage (44) telle qu'elles ne rencontreraient la couche plus dure qu'une fois réalisée la perforation par la partie de perçage (40). La cassure des ailettes (42) ne dépend donc pas de la pression que l'opérateur exerce sur la vis auto-taraudeuse.
PCT/EP2010/057371 2009-06-04 2010-05-28 Vis auto-taraudeuse WO2010139608A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009023895A DE102009023895A1 (de) 2009-06-04 2009-06-04 Selbstbohrende Schraube
DE102009023895.6 2009-06-04

Publications (1)

Publication Number Publication Date
WO2010139608A1 true WO2010139608A1 (fr) 2010-12-09

Family

ID=42556634

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/057371 WO2010139608A1 (fr) 2009-06-04 2010-05-28 Vis auto-taraudeuse

Country Status (2)

Country Link
DE (1) DE102009023895A1 (fr)
WO (1) WO2010139608A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645396A (en) * 1984-12-19 1987-02-24 Textron Inc. Wood-metal drill screw
EP2149717A2 (fr) * 2008-07-31 2010-02-03 Sun Through Industrial Co. Ltd. Vis auto-perceuse

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT369871B (de) 1980-09-30 1983-02-10 Sfs Stadler Ag Selbstbohrende schraube
DE3245700A1 (de) * 1982-12-10 1984-06-14 Richter-System GmbH & Co KG, 6103 Griesheim Selbstschneidende schnellbauschraube
DE3346704A1 (de) * 1983-12-23 1985-07-04 Richter-System GmbH & Co KG, 6103 Griesheim Selbstschneidende schnellbauschraube
AU1152588A (en) * 1987-02-18 1988-09-14 Sfs Stadler Ag Fixing device and method for the manufacture of same
US5190425A (en) * 1991-10-21 1993-03-02 Illinois Tool Works Inc. Anchor
DE29621923U1 (de) 1996-12-17 1998-04-16 Mitek Ind Gmbh Holztragwerkverbindungssystem
US7090452B2 (en) 2003-01-28 2006-08-15 Ho-Tien Chen Tapping screw

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645396A (en) * 1984-12-19 1987-02-24 Textron Inc. Wood-metal drill screw
EP2149717A2 (fr) * 2008-07-31 2010-02-03 Sun Through Industrial Co. Ltd. Vis auto-perceuse

Also Published As

Publication number Publication date
DE102009023895A1 (de) 2010-12-16

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