EP0682187A2 - Méthode pour fabriquer une vis et ébauche de vis pour cette méthode - Google Patents

Méthode pour fabriquer une vis et ébauche de vis pour cette méthode Download PDF

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Publication number
EP0682187A2
EP0682187A2 EP95105585A EP95105585A EP0682187A2 EP 0682187 A2 EP0682187 A2 EP 0682187A2 EP 95105585 A EP95105585 A EP 95105585A EP 95105585 A EP95105585 A EP 95105585A EP 0682187 A2 EP0682187 A2 EP 0682187A2
Authority
EP
European Patent Office
Prior art keywords
screw
blank
thread
outer diameter
end region
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Withdrawn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
EP95105585A
Other languages
German (de)
English (en)
Other versions
EP0682187A3 (fr
Inventor
Lothar Lux
Wolfgang Dr.-Ing. Thomala
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.)
Richard Bergner GmbH and Co
Original Assignee
Richard Bergner GmbH and Co
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 Richard Bergner GmbH and Co filed Critical Richard Bergner GmbH and Co
Publication of EP0682187A2 publication Critical patent/EP0682187A2/fr
Publication of EP0682187A3 publication Critical patent/EP0682187A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a method for producing a screw according to the preamble of the main claim and to the use of a screw blank for performing such a method.
  • a nut thread is machined with taps. This creates a thread profile, which is usually sharp-edged in the area of the outer diameter. There is therefore a particularly high notch effect or stress concentration at this point, which has an unfavorable effect on the dynamic load on the screw connection.
  • notch effect or stress concentration at this point, which has an unfavorable effect on the dynamic load on the screw connection.
  • the invention has for its object to provide a method of the type mentioned for the manufacture of a screw whose thread in the threaded end area has a reduced outer diameter, in which however, the screw can be produced on a screw blank without subsequent processing steps and using conventional shaping or rolling tools for rolling the thread. This object is solved by claim 1.
  • the screw blank which is formed in its end region with an outer diameter that is reduced or reduced compared to the remaining length of the blank, can be produced in a simple manner by the shaft of the screw blank, onto which the screw thread is subsequently rolled, reduced prefabricated, e.g. is compressed.
  • the shaft diameter of the screw blank or of the screw to be produced by subsequent rolling of the thread thus has the standard outside diameter of the thread in the region which is not first screwed into a nut thread.
  • the method according to the invention can be used particularly advantageously for centering or fitting functions, where the centering thread section is formed by a thread containing gauges with a particularly narrow outside diameter tolerance.
  • Screws with centering function or a centering threaded section are used when two or more parts to be connected to one another have to be fixed in a certain position or clamped to one another.
  • An example of such a screw connection is a connecting rod screw connection, in which the connecting rod and the connecting rod cover are tensioned such that the screw hole of the connecting rod cover and that of the rod are aligned.
  • the screw thread has the centering function should take over, is rolled with a particularly tight tolerance of the outer diameter, for example according to 4h-DIN 13.
  • Such a thread screw is known, for example, from German utility model DE-U 81 04 047.4, the thread tips being subsequently machined in order to develop a screw with a centering function with a shaft that is as uniform as possible and without rugged cross-sectional changes with the least possible manufacturing effort.
  • this known fitting thread screw is based on designs in which the centering function is carried out by cylindrical fitting elements on the screw and in particular in the end region adjoining the screw head or by special dowel pins.
  • Such cylindrical fitting elements represent discontinuities in the screw and generally have a negative effect on the resistance or durability of a screw when tensile and bending stresses occur.
  • a disadvantage of a thread screw according to this DE-U 81 04 047.4, however, is that the screw requires at least one additional post-processing operation, so that the production of such a screw is associated with relatively great effort.
  • the method according to the invention is also carried out for producing a screw with a fitting or centering function, as is protected in claim 3. It is thus possible to apply the screw thread with known thread rolling tools, so that in the area of the thread where the blank is not reduced, a standard and possibly also centering thread with a correspondingly narrow tolerance is produced. Furthermore, due to the reduced or decreasing external diameter of the screw blank in the end area, the standard thread of the threaded section adjoining the screw head and the screw thread in the area of the end area of the screw are rolled in a single operation with the molding tool profiled for producing a standard thread.
  • the method according to the invention is carried out as is claimed in claim 4.
  • the procedure according to the invention is preferably as characterized in more detail in claim 5, which can be done according to a particularly preferred embodiment according to claim 6.
  • the present invention also relates to a screw blank for use in carrying out such a method, as is characterized in more detail in claim 7.
  • a screw blank with an outer diameter that is reduced or decreasing compared to the remaining length of the blank, it is possible in a single operation to form a screw thread which is formed in its end region facing away from the screw head with a smaller outer diameter and / or rounded tips .
  • a screw blank 1 is shown, which is formed at its area 3 adjoining the screw head 2 with a diameter d. This region 3 is adjoined by an end region 4 of the shank of the screw blank 1, which end lies at the end facing away from the screw head 2 and whose diameter d r is smaller than the diameter d of the region 3 of the shank of the screw blank 1.
  • the end of the screw blank 1 facing away from the screw head 2 is designated 5.
  • An essentially continuously running, conical transition region 6 is provided between the regions 3 and 4 with different outer diameters.
  • the thread root In the before the rolling of the thread compared to the area 3 reduced outer diameter d r having end portion 4 of the screw blank or the screw produced therefrom, the thread root in turn has the diameter d2, while due to the fact that the screw blank in this end area 4 with reduced Outside diameter d r was formed, when using a forming tool for producing the standard thread in section 3 in section 4, a complete rolling out of the screw thread no longer takes place. It is thus the outer diameter d3 in this area smaller than the outer diameter d1 of the centering thread section 3 and it takes place simultaneously and without additional finishing of the outer thread diameter, for example in the form of grinding or Turning due to the incomplete rolling out rounding of the tips 8 of the thread in this end region 4.
  • each of these blanks 1 in the area 3 adjoining the screw head (not shown in more detail), in which the centering threaded section is subsequently to be formed, has a larger outer diameter than the end area adjoining the end 5 of the shaft.
  • the end region 4 again has a reduced diameter, a longer transition region 6 with a corresponding conical cross-sectional shape being provided between the regions 3 and 4, in contrast to the embodiment according to FIG. 1.
  • a screw blank 1 which, in its end region adjoining the end 5, has a plurality of partial regions 9, 10 and 11, the diameter of which, starting from the diameter of the region 3 which subsequently forms the centering threaded section is reduced in the direction of the end 5 of the screw blank 1.
  • Conical transition areas 12 are again provided between the individual sub-areas 9, 10 and 11, each with reduced outer diameters.
  • the end region 13 in the embodiment according to FIG. 5 has a conically tapering outer diameter.
  • the standard threaded section 3 is always referred to as a centering threaded section. However, this is not absolutely necessary.
  • the invention can be used in the same way advantageously for those screws in which the standard threaded section 3 has no centering function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP95105585A 1994-04-13 1995-04-13 Méthode pour fabriquer une vis et ébauche de vis pour cette méthode. Withdrawn EP0682187A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE9405984U 1994-04-13
DE9405984 1994-04-13
DE9418683U 1994-11-22
DE9418683 1994-11-22

Publications (2)

Publication Number Publication Date
EP0682187A2 true EP0682187A2 (fr) 1995-11-15
EP0682187A3 EP0682187A3 (fr) 1996-03-13

Family

ID=25961948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105585A Withdrawn EP0682187A3 (fr) 1994-04-13 1995-04-13 Méthode pour fabriquer une vis et ébauche de vis pour cette méthode.

Country Status (1)

Country Link
EP (1) EP0682187A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0958072A1 (fr) * 1997-11-10 1999-11-24 Hanstock Fasteners Pty Limited Ameliorations apportees aux vis et aux filetages
EP1186360A2 (fr) * 2000-08-10 2002-03-13 Adolf Würth GmbH & Co. KG Procédé et dispositif pour la fabrication d'éléments de visserie
WO2006125535A1 (fr) * 2005-05-21 2006-11-30 Bayerische Motoren Werke Aktiengesellschaft Gond a charniere et charniere

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985898A (en) * 1955-05-23 1961-05-30 L M Pierce Method of making a headed bolt by brazing the head on the bolt end
FR2071565A5 (fr) * 1969-12-10 1971-09-17 Karcher Schraubenwerke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985898A (en) * 1955-05-23 1961-05-30 L M Pierce Method of making a headed bolt by brazing the head on the bolt end
FR2071565A5 (fr) * 1969-12-10 1971-09-17 Karcher Schraubenwerke

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0958072A1 (fr) * 1997-11-10 1999-11-24 Hanstock Fasteners Pty Limited Ameliorations apportees aux vis et aux filetages
EP0958072A4 (fr) * 1997-11-10 2010-06-30 Ajax Cooke Pty Ltd Ameliorations apportees aux vis et aux filetages
EP1186360A2 (fr) * 2000-08-10 2002-03-13 Adolf Würth GmbH & Co. KG Procédé et dispositif pour la fabrication d'éléments de visserie
EP1186360A3 (fr) * 2000-08-10 2002-12-18 Adolf Würth GmbH & Co. KG Procédé et dispositif pour la fabrication d'éléments de visserie
WO2006125535A1 (fr) * 2005-05-21 2006-11-30 Bayerische Motoren Werke Aktiengesellschaft Gond a charniere et charniere

Also Published As

Publication number Publication date
EP0682187A3 (fr) 1996-03-13

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