EP1425141B1 - Kaltgestauchter abstandshalter - Google Patents

Kaltgestauchter abstandshalter Download PDF

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Publication number
EP1425141B1
EP1425141B1 EP03784731A EP03784731A EP1425141B1 EP 1425141 B1 EP1425141 B1 EP 1425141B1 EP 03784731 A EP03784731 A EP 03784731A EP 03784731 A EP03784731 A EP 03784731A EP 1425141 B1 EP1425141 B1 EP 1425141B1
Authority
EP
European Patent Office
Prior art keywords
punch
die
fastener
head
bore
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.)
Expired - Lifetime
Application number
EP03784731A
Other languages
English (en)
French (fr)
Other versions
EP1425141A1 (de
EP1425141A4 (de
Inventor
James S. Franco
Thomas K. Litzenberger
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.)
PEM Management Inc
Original Assignee
PEM Management Inc
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 PEM Management Inc filed Critical PEM Management Inc
Priority to AT03784731T priority Critical patent/ATE325670T1/de
Publication of EP1425141A1 publication Critical patent/EP1425141A1/de
Publication of EP1425141A4 publication Critical patent/EP1425141A4/de
Application granted granted Critical
Publication of EP1425141B1 publication Critical patent/EP1425141B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/027—Trimming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/08—Accessories for handling work or tools
    • B21J13/14—Ejecting devices
    • 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
    • B21J9/022—Special design or construction multi-stage forging presses
    • 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
    • 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
    • B21K1/50—Trimming or shearing formed heads, e.g. working with dies
    • 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
    • B21K1/56—Making machine elements screw-threaded elements

Definitions

  • the present invention relates to the formation of a self-clinching type metal fastener by a progressive forging process.
  • One effective means for producing a self-clinching fastener of the above-described type is by a progressive die forging process.
  • This process utilizes sequential punch and die forging to create the head, the clinch groove, the barrel, and the internal bore of the fastener from a metal blank or slug.
  • Such a formation process is described for example in U.S. Patent Application Serial No. 2002/0054806 entitled “Grooved Nut and Manufacturing Method Thereof" filed on January 3, 2001 by Sakamura et al. and published on May 9, 2002.
  • This document discloses the progressive punch and die tooling used in this process as exemplified by Figure 3.
  • a horizontally reciprocating ram holds a series of punches, each opposite a respective die providing a series of forging stations.
  • the punches and dies progressively form the basic shape of the fastener from a blank of metal which is moved between stations after each stroke of the ram.
  • the shearing action between the punch and die of the final station trims metal from around the edge of a temporarily formed circular head of the fastener as the blank is pushed through the die by the punch to create the final polygonal shape.
  • US-1,636,691 describes an apparatus according to the preamble of claim 1.
  • the present invention which is defined in claims 1 and 5, has been devised to cure the above-described problems of the undesirable manufacturing burr on the head of the fastener and to effect the efficient removal of the trimmed scrap ring at the final station of the head trimming station of the forging process.
  • the forging apparatus of the prior art is modified in that the punch and die tooling in the head trimming station are reversed in position. That is, the punch is positioned on the die block while the die is located on the reciprocating punch block. This reverses the direction of relative movement between the fastener and the die so that the burr is formed on the underside of the fastener head rather than the top side.
  • Steps of the forging process of the invention at the final head-trimming station may be further described as follows.
  • the fastener blank having a tubular barrel and a temporarily formed circular head is placed into a bore of a punch with the barrel of the fastener residing in the bore and an underside of the circular head abutting an end face of the punch.
  • the forging apparatus then moves the die toward the top side of the fastener until a polygonal cutting edge of the die shears metal from around the edges of the circular head of the fastener blank. Movement of the die stops when the cutting edge lies beyond the punch end face and the underside of the head of the fastener.
  • a knock-out pin which is reciprocal within the bore of the punch forceably ejects the fastener through a passage in the die and beyond an opposite side of the die into a container for completed parts.
  • the forging apparatus then moves the die away from the punch.
  • a stripper sleeve which is reciprocal about the outside surface of the punch moves from a retracted position over the end of the punch and in doing so removes a scrap ring left around the outside of the punch. Since the orientation of the tooling is horizontal, the scrap ring then falls away from the punch by gravity, and may also be assisted by pressurized oil or air to ensure the downward motion of the scrap ring is achieved.
  • the cycle is then completed and the trim station is now ready to receive the next partially formed fastener blank.
  • the apparatus for performing the inventive head-trimming process comprises a stationary punch having a bore for holding a barrel portion of a fastener blank, an end face for supporting an underside of a head portion of the fastener blank when held in the bore, and a polygonal shank.
  • the invention further includes a reciprocal die having an internal passage and a trim plate including an aperture, the trim plate aperture having a circumferential polygonal edge closely corresponding to dimensions of the shank of the punch for receiving the punch.
  • the die is movable from a retracted position toward a top side of the fastener blank to an extended trim position where the cutting edge lies beyond the punch end face.
  • a knock-out pin reciprocal within the punch bore for ejecting the fastener blank from the bore and through the die passage to an opposite side of the die.
  • a stripper sleeve slidably mounted to the outside surface of the punch is reciprocal between retracted and extended positions by a spring-activated mechanism, the extended position placing a distal end of the sleeve even with the punch end face for removing a scrap ring from the punch. Since the die is movable in a substantially horizontal plane, the scrap ring falls away from the end face of the punch by the force of gravity and can be assisted by pressurized oil and or air as needed.
  • Figure 1 diagrammatically depicts the cold forging apparatus of the prior art which includes reciprocating punch block 11 that holds a series of punches 8 that strokes toward and away from die block 13 that holds a series of dies 9 to perform a sequential forging of a metal slug 15 into the general shape of a standard type self-clinching fastener as shown in Figure 3.
  • This prior art apparatus and the apparatus of the present invention both utilize six forging stations, S1 through S6 , beginning with a first station in which metal slug 15 has been severed from a rod-like substrate material 17 and ending with the final sixth station where the cylindrical head is trimmed to a hexagonal shape on a fully formed part.
  • the slug. is sequentially moved between stations from one die cavity to the next after each stroke of the punch block by a transfer mechanism well known in the art (not shown).
  • the invention lies within the apparatus and operation of the sixth and final forming station where the circular head of the fastener blank is trimmed to a hexagonal shape.
  • stations 1-5 being essentially the same as shown in the prior art device of Figure 1.
  • One of the aspects of the invention is the reversal of punch 8 and die 9 elements of the previous stations so that the die assembly 12 of the invention at the sixth station is held by the reciprocating punch block 11 while the punch assembly 14 is fixed in the stationary die block 13. By reversing the position of these elements, the direction of the head trimming shear is reversed. Also, as will be further described, the finished part is ejected through the punch block rather than falling through the stationary die block 13 as in the prior art.
  • Trim die 12 includes trim plate 27 that has a hexagonal opening with a cutting edge along its inside surface.
  • Punch assembly 14 includes a holder 19 that rigidly secures hexagonal punch 23.
  • the punch assembly further includes a stripper sleeve 25 and a knock-out pin 21 that are slidable within the assembly relative to the fixed punch 23 and holder 19. Means to effect the motion of the stripper sleeve and the knock-out pin are not shown and are well within the knowledge of one of skill in the art.
  • the fastener blank 16 is delivered by a transfer mechanism (not shown) so that a barrel of the fastener resides within the cylindrical bore of a hexagonal punch 23 which is rigidly secured within holder 19.
  • the first step in the trim process begins with the motion of the die 12 toward the fastener. In this position, the underside of the circular head 15 of the fastener blank abuts an end face of the punch.
  • the die has moved to the end of its stroke to the completed trim position.
  • a cutting edge on the trim plate 27 on the face of the die has severed a scrap ring 18 from the fastener blank which is sheared by the punch 23 from the circular head of the fastener to provide a resulting hexagonal shape.
  • the hexagonal head now resides within a passage of the die beyond a backside of the trim plate.
  • the knock-out pin 21 which is preferably spring-loaded (spring mechanism not shown) is released and forceably ejects the finished fastener 16 through the die passage 20 and away from an opposite side of the die falling away by the force of gravity as depicted by the arrows shown in this figure. It should be noted at this stage that the scrap ring 18 remains around the outside of the punch 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Slide Fasteners (AREA)

Claims (4)

  1. Vorrichtung zum Zurechtstanzen der Köpfe der Rohlinge von Verbindungselementen, die in einem Gerät zum Kaltformen eingesetzt wird und folgendes umfasst:
    - einen stationären Halter (19) für einen Stanzer;
    - einen Stanzer (23), der ein Bohrloch aufweist, welches den Zylinderteil der Rohlinge der Verbindungselemente (16) hält und eine Endseite umfasst, die die Unterseite des Kopfteils (15) der im Bohrloch gehaltenen Rohlinge der Verbindungselemente stützt und einen polygonalen Schaft aufweist; und durch folgendes gekennzeichnet ist:
    - ein Formwerkzeug (12), das einen inneren Durchgang aufweist, durch den das Verbindungselement (20) fallen kann, wobei der innere Durchgang des Formwerkzeugs während der Benutzung einen Auswurfsbolzen aufnimmt, der reziprok in dem bereits erwähnten Bohrloch zum Auswerfen der fertigen Verbindungselemente durch den bereits erwähnten Durchgang aus einer gegenüberliegend Seite des Formwerkzeugs dient, und
    - eine Schnittplatte (27), die eine Öffnung umfasst welche eine umlaufende polygonale Schnittkante aufweist, die genau den Abmessungen des Schafts des bereits erwähnten Stanzers (23) zur Aufnahme des Stanzers (23) entspricht, wobei ferner das Formwerkzeug (12) von einer eingefahrenen Stellung, wo sie gegen die Oberseite der erwähnten Rohlinge der Verbindungselemente (16) liegt, zu einer ausgefahrenen Schnittstellung koaxial zum bereits erwähnten Stanzer (23) beweglich ist, in der die Schneidekante hinter der Endseite des Stanzers liegt.
  2. Vorrichtung nach Anspruch 1, welche ferner eine verschiebbar an der Außenseite des erwähnten Stanzers (23) angebrachte Abstreifschlaufe (25) umfasst, die zwischen einer eingefahrenen Stellung und einer ausgefahrenen Stellung bewegt werden kann, wobei ein distales Ende der Schleife in der ausgefahrenen Stellung hinter der Endseite des Stanzers liegt um den Ring aus Fertigungsabfall (18) vom Stanzer (23) zu entfernen.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das bereits erwähnte Formwerkzeug (12) in einer vorwiegend horizontalen Ebene beweglich ist und dass der Ring aus Fertigungsabfall von der Endseite des Stanzers durch die Gravitationskraft beim Entfernen des Stanzers abfällt.
  4. Verfahren zum Zurechtstanzen der Köpfe der Rohlinge von Verbindungselementen in einem Kaltformverfahren, welches folgendes umfasst:
    - das Platzieren eines Rohlings eines Verbindungselementes (16) in ein Bohrloch eines Stanzers (23), der eine Endseite aufweist, wobei die Unterseite des Kopfendes (15) des bereits erwähnten Rohlings eines Verbindungselementes (16) durch die Endseite des Stanzers gestützt wird;
    - die Bewegung eines Formwerkzeugs (12), welches einen inneren Durchgang (20) und eine Schnittplatte (27) mit einer Schneidekante umfasst, auf den bereits erwähnten Rohling eines Verbindungselementes zu;
    - das Beschneiden des Kopfes des bereits erwähnten Rohlings eines Verbindungselementes (16) mit der Schneidekante der Schnittplatte (27);
    - die Unterbrechung der Bewegung des Formwerkzeugs (12) in einer ausgefahrenen Schneidestellung, in der die Schneidekante hinter einer Unterseite des Kopfendes des bereits erwähnten Rohlings eines Verbindungselementes liegt;
    - den Auswurf des Rohlings des Verbindungselementes aus dem Bohrloch des Stanzers durch den bereits erwähnten Durchgang (20) zu einer gegenüberliegenden Seite des Formwerkzeugs;
    - das Einziehen des Formwerkzeugs; und
    - die Entfernung eines Rings aus Fertigungsabfall (18), welcher sich um den Stanzer befindet, durch die Bewegung der Abstreifschlaufe (25), die beweglich an der Außenseite des Stanzers(23) angebracht ist, bis der Ring aus Fertigungsabfall (18) durch die Abstreifschlaufe (25) von der Endseite des Stanzers abgedrückt wird.
EP03784731A 2003-03-18 2003-03-18 Kaltgestauchter abstandshalter Expired - Lifetime EP1425141B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT03784731T ATE325670T1 (de) 2003-03-18 2003-03-18 Kaltgestauchter abstandshalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2003/007832 WO2004014620A1 (en) 2003-03-18 2003-03-18 Cold-headed standoff

Publications (3)

Publication Number Publication Date
EP1425141A1 EP1425141A1 (de) 2004-06-09
EP1425141A4 EP1425141A4 (de) 2004-06-30
EP1425141B1 true EP1425141B1 (de) 2006-05-10

Family

ID=31713805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03784731A Expired - Lifetime EP1425141B1 (de) 2003-03-18 2003-03-18 Kaltgestauchter abstandshalter

Country Status (7)

Country Link
EP (1) EP1425141B1 (de)
JP (1) JP3919119B2 (de)
CN (1) CN1282510C (de)
AU (1) AU2003225790A1 (de)
CA (1) CA2454527A1 (de)
DE (1) DE60305130T2 (de)
WO (1) WO2004014620A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4031767B2 (ja) * 2004-03-26 2008-01-09 日東精工株式会社 ボス部材の製造方法
US7594788B2 (en) * 2005-02-08 2009-09-29 Pem Management, Inc. Clinch/broach connector
JP6797641B2 (ja) * 2016-11-11 2020-12-09 日本特殊陶業株式会社 加工装置、成形体の製造方法およびスパークプラグ用電極の製造方法
CN112808925B (zh) * 2021-02-02 2024-07-19 鹏驰五金制品（昆山）有限公司 一种半圆螺栓成型设备

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1428174A (en) * 1920-04-22 1922-09-05 John A Luther Die structure
US1636691A (en) * 1923-09-20 1927-07-26 Richard M Heames Apparatus for trimming blanks
US3296905A (en) * 1965-01-08 1967-01-10 John S Killaly Compressive stripping unit and indexing type nibbling punch for turret punch presses and the like
GB1212275A (en) * 1968-07-26 1970-11-11 Dale Foundries Ltd John Improvements in or relating to the manufacture of hexagonal slugs
JPS5118259A (en) * 1974-08-06 1976-02-13 Tomio Ishida Netsukanfuoomaaniokeru naigairindojiseizosochi
US4463637A (en) * 1979-01-12 1984-08-07 Delio Ralph D Method and apparatus for trimming forgings
US4391118A (en) * 1979-06-04 1983-07-05 United States Steel Corporation Mechanism for forming a hole through a forged workpiece
US4590780A (en) * 1982-10-06 1986-05-27 Hatebur Umformmaschinen Ag Process and apparatus for producing at least two forgings on a hot-forming press
US5373720A (en) * 1992-09-03 1994-12-20 Water Gremlin Company Method of making battery terminal with necked flange
JP3699346B2 (ja) * 2000-11-06 2005-09-28 株式会社阪村機械製作所 溝付きナットの製造方法

Also Published As

Publication number Publication date
JP3919119B2 (ja) 2007-05-23
JP2005519772A (ja) 2005-07-07
DE60305130D1 (de) 2006-06-14
CN1564727A (zh) 2005-01-12
AU2003225790A1 (en) 2004-02-25
EP1425141A1 (de) 2004-06-09
CN1282510C (zh) 2006-11-01
DE60305130T2 (de) 2006-12-21
WO2004014620A1 (en) 2004-02-19
CA2454527A1 (en) 2004-02-19
EP1425141A4 (de) 2004-06-30

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