EP0799113A1 - Procede pour enfoncer des vis - Google Patents

Procede pour enfoncer des vis

Info

Publication number
EP0799113A1
EP0799113A1 EP95942173A EP95942173A EP0799113A1 EP 0799113 A1 EP0799113 A1 EP 0799113A1 EP 95942173 A EP95942173 A EP 95942173A EP 95942173 A EP95942173 A EP 95942173A EP 0799113 A1 EP0799113 A1 EP 0799113A1
Authority
EP
European Patent Office
Prior art keywords
impact
hole
thread
drilling
forming
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.)
Granted
Application number
EP95942173A
Other languages
German (de)
English (en)
Other versions
EP0799113B1 (fr
Inventor
Helmut Österle
Erich Palm
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.)
SFS Industrie Holding AG
Original Assignee
SFS Industrie 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 Industrie Holding AG filed Critical SFS Industrie Holding AG
Publication of EP0799113A1 publication Critical patent/EP0799113A1/fr
Application granted granted Critical
Publication of EP0799113B1 publication Critical patent/EP0799113B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B25B21/023—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket for imparting an axial impact, e.g. for self-tapping screws

Definitions

  • the invention relates to a method for setting a self-drilling or self-tapping and thread-forming or tapping screw, which has a drilling part or a hole-forming end section and a shaft with a self-tapping or self-tapping thread, in which a screw in during the drilling or hole-forming process Axial direction acting impact is switched on.
  • DE-A 14 78 914 describes a method of the aforementioned type.
  • the impact effect in the known method consists only of a single impact which is exerted in order to produce the hole.
  • the screw is then screwed into the workpiece.
  • This known method can only be used with thin materials if a stop is provided on the opposite side to prevent the material from bending when the blow is made to make the hole. Providing such a stop means an additional work step that extends the setting time and, moreover, is not always possible.
  • care has always been taken to ensure that the drilling process ends before the thread forming process begins, since the feed speed is considerably greater than the usual drilling feed, depending on the thread pitch. In a drilling process, a corresponding axial force and a corresponding torque have to be applied, whereas after the engagement of the first thread, practically only a corresponding torque has to be applied.
  • the present invention has now set itself the task of proposing a method of the type mentioned, which ensures optimal molding and an optimal fit in the thread with a shorter setting time, especially with thin materials.
  • this is achieved in that the impact is caused by constant impact movements generated in the manner of a hammer drill, and that the impact is maintained in the subsequent thread forming or cutting process, or its strength is reduced or completely eliminated.
  • the advantage that is achieved by the method according to the invention lies primarily in the possibility of using the method even with thin materials, without a stop having to be provided on the opposite side in order to prevent bending. It is From DE 43 01 610 A1 and from DE 42 36 819 A1 an impact wrench or a combination of impact drill and impact wrench are known in which the impact effect can be switched off, but they are for a method for setting self-drilling or self-hole-forming and thread-forming or fast-cutting screw neither determined nor suitable.
  • the two process steps namely the impact action during the drilling or hole-forming process
  • the impact or the cutting process is reduced or eliminated completely in the subsequent thread forming or cutting process. It is to be regarded as a particular advance in the field of screw setting that these different process steps are used in succession in a single setting process.
  • the method according to the invention has even made it possible to form a hole without a rotary drive, as only with constant hammer movements produced in the manner of a hammer drill, which brings about the advantages indicated above, in particular in the case of thin workpieces.
  • a substrate made of wood or wood-based materials it is also possible to maintain the impact when screwing in. In the case of a substrate made of metal, for example, a reduced or completely eliminated impact is necessary.
  • a rotary drive for the screw it is possible for a rotary drive for the screw to be connected to the impact action acting in the axial direction during the drilling or hole-forming process.
  • the drilling or hole forming process can be improved even further by means of a rotary drive and superimposed impact.
  • the changeover from an axial impact to a reduced axial impact or the elimination of the impact from an axial relief is triggered immediately after the drilling or hole-forming process has ended.
  • Sudden axial relief is e.g. then given when the drilling part or the hole-forming end section has finished the bore or the hole, so that an immediate and sudden axial relief is created by the completion of the drilling process.
  • This axial relief - whether it occurs suddenly or more slowly - can be used in the method according to the invention as a mechanical signal or as a trigger for electrical signals in order to reduce the axial impact or to switch it off entirely.
  • the switchover from an axial impact to a reduced axial impact or the deactivation of the impact can be triggered by a presettable depth stop.
  • This variant of the method according to the invention can also be understood in a simple structural design, since an axial impact, for example in impact drills or Hammer drills are only available if a corresponding axial back pressure is applied. If, after the impact of a corresponding depth stop, this counterpressure no longer occurs from the screw, the switchover or switch-off provided according to the invention takes place.
  • Figure 1 is a side view of the screw, which is just placed on a workpiece.
  • Figure 2 shows this screw after forming a hole and immediately before the beginning of the thread cutting or forming process.
  • Fig. 3 shows an enlarged section through the workpiece and the screw, in particular the mutual thread engagement can be seen.
  • the hole and thread-forming screw 1 shown here is provided with a non-cutting hole-forming end section 2 which ends in a tip or z in a tip-like shape. Furthermore, a shaft section 4 provided with a thread 3 and an engagement section for attaching or inserting a tool are provided.
  • a screw 1 was assumed, which is designed to be self-piercing and self-tapping. There is therefore a non-cutting hole-forming end section 2 and a corresponding thread 3.
  • the method described here can, however, be used for all other self-tapping or thread-forming screws, and it is also possible in this way to set screws which are self-tapping and self-tapping. It is not essential for the present process whether the drilling process or the hole forming process or the thread forming or cutting is carried out without cutting or cutting.
  • B Experiments have shown that the present method can also be used with particular success with self-drilling screws. It is irrelevant whether there is a drill tip made by forming or a corresponding drill bit at the free end of the screw.
  • screws with a hole-forming end section 2 or with other structural designs can be used, the screws being able to consist of a stainless material through and through.
  • the method described here is therefore that the rotary drive for the screw 1 in the hole-forming process is activated by an impact acting in the axial direction 6.
  • the screw is also subjected to the axial impact 6.
  • a corresponding hole 8 can be formed in the workpiece 9 in a work time which has been considerably shortened up to now.
  • a rotary drive would then be switched on after the hole forming to form the thread.
  • the impact is switched off after the further method step, so that only the rotary drive 7 is still effective.
  • the thread formed in the hole wall thus fits exactly on the surface of the thread 3 of the shaft 4.
  • the impact action is switched off during the subsequent thread forming or cutting process.
  • a slight impact that is to say a strength which is significantly reduced compared to the drilling process, would make sense.
  • An additional positive effect results from the axially acting impact, because the hole wall is additionally deformed downward, both when shaping and drilling a hole, especially in the case of thinner workpieces 9, so that a type of collar 10 results in the area of the hole 8 .

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Drilling And Boring (AREA)
  • Centrifugal Separators (AREA)
  • Earth Drilling (AREA)
  • Taps Or Cocks (AREA)
  • Forging (AREA)
  • Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Screw Conveyors (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Drilling Tools (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Numerical Control (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
EP95942173A 1994-12-21 1995-12-18 Procede pour enfoncer des vis Expired - Lifetime EP0799113B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4445812 1994-12-21
DE4445812A DE4445812C2 (de) 1994-12-21 1994-12-21 Verfahren zum Setzen einer Schraube
PCT/EP1995/004993 WO1996019320A1 (fr) 1994-12-21 1995-12-18 Procede pour enfoncer des vis

Publications (2)

Publication Number Publication Date
EP0799113A1 true EP0799113A1 (fr) 1997-10-08
EP0799113B1 EP0799113B1 (fr) 1999-01-13

Family

ID=6536596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95942173A Expired - Lifetime EP0799113B1 (fr) 1994-12-21 1995-12-18 Procede pour enfoncer des vis

Country Status (15)

Country Link
EP (1) EP0799113B1 (fr)
JP (1) JPH10500364A (fr)
CN (1) CN1046452C (fr)
AT (1) ATE175612T1 (fr)
AU (1) AU706778B2 (fr)
CA (1) CA2208700A1 (fr)
CZ (1) CZ177797A3 (fr)
DE (2) DE4445812C2 (fr)
DK (1) DK0799113T3 (fr)
ES (1) ES2129890T3 (fr)
FI (1) FI114974B (fr)
GR (1) GR3029398T3 (fr)
PL (1) PL177827B1 (fr)
RU (1) RU2153605C2 (fr)
WO (1) WO1996019320A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10258238B4 (de) * 2002-12-13 2005-11-10 Audi Ag Nagelschraube zur Herstellung einer Fügeverbindung, sowie ein Fügeverfahren unter Verwendung der Nagelschraube und eine Vorrichtung zur Durchführung des Fügeverfahrens
DE102015226085A1 (de) * 2015-12-18 2017-06-22 Robert Bosch Gmbh Handwerkzeugmaschine mit einer Schalteinheit
DE102022132885A1 (de) 2022-12-09 2024-06-20 Böllhoff Verbindungstechnik GmbH Zweistufiges Fügeverfahren, Fügeverbindung mit einem Stapel aus Bauteilen und Fügevorrichtung dafür

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1909366A (en) * 1932-05-05 1933-05-16 Charles A Koza Tool
GB1056699A (en) * 1964-07-08 1967-01-25 Gkn Screws Fasteners Ltd A tool for applying a self-piercing and self-threading screw to a workpiece
US4370906A (en) * 1980-05-05 1983-02-01 Resonant Technology Company Sequenced fastener installation system
DE3121275A1 (de) * 1981-05-29 1982-12-16 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zum motorischen eindrehen von schrauben
JP2558753Y2 (ja) * 1991-10-31 1998-01-14 株式会社マキタ 回転電動工具の動力伝達機構
DE4301610C2 (de) * 1993-01-22 1996-08-14 Bosch Gmbh Robert Schlagschrauber

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9619320A1 *

Also Published As

Publication number Publication date
AU706778B2 (en) 1999-06-24
CZ177797A3 (en) 1997-12-17
FI972606A (fi) 1997-06-18
ATE175612T1 (de) 1999-01-15
ES2129890T3 (es) 1999-06-16
RU2153605C2 (ru) 2000-07-27
FI114974B (fi) 2005-02-15
DE59504846D1 (de) 1999-02-25
WO1996019320A1 (fr) 1996-06-27
PL177827B1 (pl) 2000-01-31
CN1046452C (zh) 1999-11-17
CA2208700A1 (fr) 1996-06-27
DE4445812C2 (de) 1996-11-28
DK0799113T3 (da) 1999-09-06
DE4445812A1 (de) 1996-06-27
FI972606A0 (fi) 1997-06-18
EP0799113B1 (fr) 1999-01-13
GR3029398T3 (en) 1999-05-28
JPH10500364A (ja) 1998-01-13
CN1170377A (zh) 1998-01-14
PL320855A1 (en) 1997-11-10
AU4345696A (en) 1996-07-10

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