US20150190861A1 - Method and device for producing grooved bolts - Google Patents

Method and device for producing grooved bolts Download PDF

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Publication number
US20150190861A1
US20150190861A1 US14/419,417 US201314419417A US2015190861A1 US 20150190861 A1 US20150190861 A1 US 20150190861A1 US 201314419417 A US201314419417 A US 201314419417A US 2015190861 A1 US2015190861 A1 US 2015190861A1
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US
United States
Prior art keywords
bolt
head
final compression
stamp
during
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.)
Abandoned
Application number
US14/419,417
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English (en)
Inventor
Jakob Funk
Dieter Hoffmann
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.)
RT HOLDINGS III WG (US) LP
Original Assignee
RT HOLDINGS III WG (US) LP
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 RT HOLDINGS III WG (US) LP filed Critical RT HOLDINGS III WG (US) LP
Publication of US20150190861A1 publication Critical patent/US20150190861A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/44—Making machine elements bolts, studs, or the like
    • B21K1/46—Making machine elements bolts, studs, or the like with heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/06—Swaging presses; Upsetting presses

Definitions

  • the present invention relates to a method and a device for producing bolts having a head which is provided with a peripheral groove or channel (grooved bolts), and a device suitable for this.
  • Corresponding grooved bolts act, for example, as a basis for stabiliser ball pins and comprise a cylindrical shaft and a cylindrical head, which has a horizontally extending groove or channel.
  • an object of the present invention is therefore to provide a method and a device for producing such a grooved bolt, in which no additional operating steps are required, the material use and the material waste are reduced and better strength can be achieved.
  • the above object is achieved with a method for producing a bolt having a head which is provided with a peripheral groove or channel, wherein the groove or channel is produced in a non-cutting manner by pressing a bead on the head of the bolt using a radially active closure tool.
  • the bolt is particularly preferable for the bolt to be produced from a wire portion by twice pre-compressing the head and final compression, with the bead for the groove or the channel being produced.
  • a bolt having a groove can be produced during the same operating steps as were previously necessary for the bolt blank which was intended to be processed by means of a cutting processing operation, that is to say, by means of turning. According to the invention, an entire operating step can thus be saved on an additional processing machine (turning machine).
  • the head of the bolt during pre-compression, to assume the shape of two concentric cylinders which are located one on top of the other, the shaft-side cylinder having a larger diameter than the cylinder arranged thereabove and, during final compression, for there to be produced on the upper end of the upper cylinder a radially outwardly extending bead which then forms the upper delimitation of the groove or channel by the two concentric cylinders being surrounded by jaws of a tool which are provided with corresponding steps during the final compression operation so that only the uppermost end of the uppermost cylinder can be deformed outwards during the final compression operation.
  • the tool for final compression precompressed bolt in the axial direction of the opening is movably arranged and which widens upwards in a conical manner and in which there are moved downwards in an axial direction during the final compression operation the jaws of the tool which have at the outer sides thereof chamfered portions which correspond to the conical widening so that they automatically close around the head of the bolt during the final compression operation.
  • the stamp which is required for final compression of the head of the bolt and for producing the bead to be constructed in a hollow-cylindrical manner and to be received in a hollow-cylindrical stamp retention member in an axially displaceable manner and for the stamp retention member to be designed in such a manner that it first presses the jaws of the tool downwards during the final compression operation so that they close around the head of the bolt and the stamp is only then moved downwards in order to form the bead as an upper delimitation of the groove or channel.
  • an object of the present invention is also achieved with a device for producing a groove or channel on the head of a bolt in a non-cutting manner, in which the device comprises jaws which are provided with corresponding steps and which engage around the head of the bolt during the final compression operation.
  • the device prefferably provided with a socket which has a cylindrical opening in which a cupping insert for receiving the shaft of the pre-compressed bolt in the axial direction of the opening is movably arranged and which widens upwards in a conical manner and in which there can be moved downwards during the final compression operation the jaws which have at the outer sides thereof chamfered portions which correspond to the conical widening and by means of which they can automatically close around the head of the bolt during the final compression operation.
  • the device comprises a hollow-cylindrical stamp which is received in a hollow-cylindrical stamp retention member in an axially displaceable manner, the stamp retention member being arranged in such a manner that it first presses the jaws downwards during the final compression operation so that they close around the head of the bolt and the stamp can only then be moved downwards in order to form the bead as an upper delimitation of the groove.
  • FIG. 1 shows a pressing blank for a grooved bolt according to the invention
  • FIG. 2 shows the completed grooved bolt according to the present invention
  • FIG. 3 shows the tool according to the invention for producing a grooved bolt according to FIG. 2 from a pressing blank according to FIG. 1 in the open state sectioned along the axis of rotation;
  • FIG. 4 shows the tool of FIG. 3 in the open state viewed from above (from the operating direction of the stamp);
  • FIG. 5 shows the tool from FIG. 3 in the closed state with the grooved bolt inserted at the end of the forming of the bead, also sectioned along the axis of rotation;
  • FIG. 6 shows the tool of FIG. 5 in the closed state viewed from above (without a bolt blank and without a pressing stamp).
  • FIG. 1 shows a conventional pressing blank 10 ′ for a grooved bolt 10 according to the invention. From a similar pressing blank 10 ′ but with a larger volume, a grooved bolt which corresponded to FIG. 2 was previously produced according to the prior art by turning a groove in the head 12 ′.
  • FIG. 2 shows the grooved bolt 10 produced from the pressing blank 10 ′ according to the invention by means of pressing, that is to say, exclusively by means of non-cutting processing operations. It comprises a shaft 11 , which is adjoined by a head 12 which comprises two concentric cylindrical portions 14 and 16 which are arranged one above the other, the cylindrical portion 16 located further away from the shaft having a smaller diameter and forming together with the bead 18 located even further away from the shaft the groove or channel 20 .
  • the grooved bolt 10 is produced from the pressing blank 10 ′ in that a special tool, which is explained in greater detail below, engages around the cylindrical portions 14 and 16 of the head 12 and consequently by means of a hollow-cylindrical stamp there is applied to the uppermost portion of the head 12 a pressing action by means of which the bead 18 is formed.
  • This special tool is a device for non-cutting production of a groove or channel on the head of a pressing blank 10 ′ of a bolt.
  • FIG. 3 shows the lower portion of the tool 100 in the open state, without a pressing blank being inserted.
  • the tool 100 is rotationally symmetrical and illustrated in FIG. 3 in a state sectioned along the rotation axis thereof.
  • the tool 100 according to the invention illustrated in FIG. 3 for non-cutting production of a groove or channel on the head of a bolt has a hollow-cylindrical socket 102 which centrally has a concentric cylindrical opening 104 which widens upwards in a conical manner.
  • a cupping insert 106 which is also hollow-cylindrical is arranged coaxially with respect to the socket 102 so as to be able to be displaced along the common rotation axis.
  • An ejector pin 108 is also concentrically arranged inside the cupping insert 106 .
  • the cupping insert 106 protrudes upwards into the region 110 of the opening 104 that widens in a conical manner.
  • the individual jaws 112 of the segmented tool can be seen above the cupping insert 106 . In this instance, an embodiment with four such segments 112 is illustrated. Naturally, the present invention may also be produced with three, five, six or more such segments.
  • the individual segments are designed in the form of a circle sector and have at the inner side thereof two steps 114 , 116 which in the closed state abut the respective steps 14 , 16 of the head 12 of the bolt 10 and delimit a deformation of this region of the head during the pressing operation, in order to ensure dimensional accuracy within the required specifications and provisions.
  • the jaws 112 are chamfered in a conical manner at the same angle as the conical region 110 of the opening 104 . In this manner, the jaws 112 , when they are moved downwards during the pressing operation, are automatically closed since they are necessarily brought together by the inclined portions 110 of the opening 104 .
  • a pressing blank 10 ′ can be inserted with the shaft 11 ′ thereof into the cylindrical opening 118 of the cupping insert 106 . How the further final compression operation (pressing operation) is carried out will be explained below with reference to FIGS. 5 and 6 .
  • FIG. 4 shows the device 100 of FIG. 3 from above.
  • the four jaws 112 which are opened and which therefore have corresponding slots therebetween and the socket 102 which surrounds them can be seen clearly.
  • the opening for receiving the shaft 11 ′ of the pressing blank 10 ′ which is closed at the lower end thereof by means of the ejector pin 108 .
  • FIG. 5 shows the actual closing pressing operation of the final compression operation of a grooved bolt 10 produced according to the invention.
  • the grooved bolt 10 is inserted into the opening 118 of the cupping insert 106 so that the head 12 of the bolt 10 protrudes beyond the cupping insert 106 .
  • the pressing operation of the final compression operation is brought about by an upper tool part 120 .
  • This comprises a hollow-cylindrical stamp 122 , which is concentrically surrounded by a stamp retention member 124 , the stamp retention member 124 also being designed in a hollow-cylindrical manner and both members being arranged concentrically.
  • the stamp 122 is movably inserted in the stamp retention member 124 parallel with the common rotation axis.
  • the stamp 122 is itself constructed in a hollow manner and has a concentric cylindrical opening, whose inner diameter is slightly smaller than the protuberance of the head 12 ′ of the bolt blank 10 ′ which extends beyond the two cylindrical steps 14 and 16 of the bolt 10 . Furthermore, there moves in this opening of the stamp 122 another ejector pin 126 which can also be moved parallel with the common rotation axis.
  • FIG. 5 in comparison with FIG. 3 , the operation of final compression of the head 12 of the bolt 10 can be seen clearly.
  • the upper tool part 120 is lowered onto the lower tool 100 .
  • the stamp retention member 124 thereby first comes into abutment with the jaws 112 and subsequently pushes them downwards so that they are necessarily pushed together by the conical inclined portions 110 of the opening 104 until they securely surround the two cylindrical portions 14 , 16 of the head 12 of the bolt 10 .
  • the stamp 122 is moved further downwards so that it pushes a portion of the upper protuberance of the head 12 ′ of the blank 10 ′ downwards and radially outwards so that the bead 18 is thereby produced.
  • the upper tool part 120 which comprises the components 122 / 124 / 126 and which holds down the head 12 of the bolt 10 is lifted again from the completely pressed head 12 of the bolt 10 .
  • the jaws 112 can then open again and the completed bolt 10 can be ejected from the opening 118 in the cupping insert 106 by the ejector pin 108 .
  • the outer periphery of the stamp retention member 124 must be adapted in terms of diameter and inclination to the conical region 110 of the opening 104 in the socket 102 . It must therefore have a smaller outer diameter and an inclined portion which is smaller than or equal to the conical region 110 .
  • FIG. 6 shows the tool 100 from above with closed jaws 112 .
  • the bolt 10 and tool upper part 120 are not illustrated in this instance.
  • a corresponding grooved bolt can be produced in a significantly more rapid and efficient manner, and without the production of cutting waste. Furthermore, the bolt head has better strength values owing to the non-cutting production.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US14/419,417 2012-09-19 2013-09-02 Method and device for producing grooved bolts Abandoned US20150190861A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012018478.6 2012-09-19
DE102012018478.6A DE102012018478A1 (de) 2012-09-19 2012-09-19 Verfahren und Vorrichtung zur Herstellung von Rillenbolzen
PCT/DE2013/200146 WO2014044271A1 (de) 2012-09-19 2013-09-02 Verfahren und vorrichtung zur herstellung von rillenbolzen

Publications (1)

Publication Number Publication Date
US20150190861A1 true US20150190861A1 (en) 2015-07-09

Family

ID=49515143

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/419,417 Abandoned US20150190861A1 (en) 2012-09-19 2013-09-02 Method and device for producing grooved bolts

Country Status (7)

Country Link
US (1) US20150190861A1 (de)
EP (1) EP2897745B1 (de)
CA (1) CA2880315A1 (de)
DE (1) DE102012018478A1 (de)
MX (1) MX2015003496A (de)
TW (1) TW201422336A (de)
WO (1) WO2014044271A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020243476A1 (en) 2019-05-31 2020-12-03 Penn Engineering & Manufacturing Corp. Extrusion forming method and forming apparatus for manufacturing self-clinching rivet

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR463212A (fr) * 1913-09-22 1914-02-17 Ernest Saignol Procédé de fabrication de tete de vis de lit au moyen du balancier par refoulement et non par écrasement
US3188849A (en) * 1961-09-12 1965-06-15 Nat Machinery Co Method and apparatus for multiple upsetting
US3301033A (en) * 1964-08-14 1967-01-31 Emporium Specialties Co Inc Apparatus for producing headed wire forms
JPH0620577B2 (ja) * 1988-04-14 1994-03-23 日本特殊陶業株式会社 塑性加工による点火栓用端子ナットの製造方法
DE202009014886U1 (de) * 2009-12-18 2010-05-12 Kamax-Werke Rudolf Kellermann Gmbh & Co. Kg Kugelzapfen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020243476A1 (en) 2019-05-31 2020-12-03 Penn Engineering & Manufacturing Corp. Extrusion forming method and forming apparatus for manufacturing self-clinching rivet
EP3976289A4 (de) * 2019-05-31 2023-06-21 Penn Engineering & Manufacturing Corp. Extrusionsformverfahren und formvorrichtung zur herstellung einer einpressniete

Also Published As

Publication number Publication date
CA2880315A1 (en) 2014-03-27
EP2897745B1 (de) 2017-04-05
TW201422336A (zh) 2014-06-16
MX2015003496A (es) 2015-06-22
WO2014044271A1 (de) 2014-03-27
DE102012018478A1 (de) 2014-03-20
EP2897745A1 (de) 2015-07-29

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