EP1425141A4 - Cold-headed standoff - Google Patents
Cold-headed standoffInfo
- Publication number
- EP1425141A4 EP1425141A4 EP03784731A EP03784731A EP1425141A4 EP 1425141 A4 EP1425141 A4 EP 1425141A4 EP 03784731 A EP03784731 A EP 03784731A EP 03784731 A EP03784731 A EP 03784731A EP 1425141 A4 EP1425141 A4 EP 1425141A4
- 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.)
- Granted
Links
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.
- BACKGROUND AND DESCRIPTION OF THE PRIOR ART Internally-threaded, self-clinching type fasteners are well-known in the art. When installed, they provide materials such as sheet metal panels with a threaded structure to receive a screw so that elements can be secured to the panel.
- a typical self-clinching fastener of the standoff type which includes an elongate barrel is shown in Figures 3 and 4.
- the basic structures of this type of fasteners include a head, a self- clinch groove, a barrel, and an internal bore with threads.
- the fastener is installed by a press and anvil so that the groove receives the cold flow of metal from the sheet while the polygonal head is embedded into the sheet.
- These structures secure the fastener to the sheet rigidly, both axially and rotationally.
- 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. As shown in this figure, 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
- the present invention has been devised to cure the above-described problems
- 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
- 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 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
- the die is movable from a retracted position toward a top side of the fastener blank to an extended trim position where the
- 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
- FIG. 1 is a top diagrammatic view of a prior art multi-station cold forging
- Figure 2 is a top plan view diagrammatically showing the cold forging
- Figure 3 is a side partial cross section view of a fastener formed by the prior art
- Figure 4 is a partial cross section view with an enlarged area of a fastener produced by the present invention.
- Figure 5 is an exploded isometric assembly view of the various elements of the present invention corresponding to forging station number six shown in Figure 2.
- Figures 6 A through 6D are side elevation partial cut-away views of the cold forging apparatus of the present invention showing its sequential operation.
- DESCRIPTION OF THE PREFERRED E1MBODIMENT 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
- 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
- Trim die 12 includes trim plate 27 that has a hexagonal
- Punch assembly 14 includes a
- the punch assembly further includes a stripper sleeve 25 and a knock-out pin 21 that are slidable within the
- stripper sleeve and the knock-out pin are not shown and are well within the
- the fastener blank 16 is delivered by a transfer mechanism (not shown) so
- the first step in the trim process begins with
- hexagonal head now resides within a passage of the die beyond a backside of the trim
- knock-out pin 21 which is preferably spring-loaded (spring mechanism not shown) is
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Slide Fasteners (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT03784731T ATE325670T1 (en) | 2003-03-18 | 2003-03-18 | COLD PRESSED SPACER |
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 (en) | 2004-06-09 |
EP1425141A4 true EP1425141A4 (en) | 2004-06-30 |
EP1425141B1 EP1425141B1 (en) | 2006-05-10 |
Family
ID=31713805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03784731A Expired - Lifetime EP1425141B1 (en) | 2003-03-18 | 2003-03-18 | Cold-headed standoff |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1425141B1 (en) |
JP (1) | JP3919119B2 (en) |
CN (1) | CN1282510C (en) |
AU (1) | AU2003225790A1 (en) |
CA (1) | CA2454527A1 (en) |
DE (1) | DE60305130T2 (en) |
WO (1) | WO2004014620A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4031767B2 (en) * | 2004-03-26 | 2008-01-09 | 日東精工株式会社 | Boss member manufacturing method |
US7594788B2 (en) * | 2005-02-08 | 2009-09-29 | Pem Management, Inc. | Clinch/broach connector |
JP6797641B2 (en) | 2016-11-11 | 2020-12-09 | 日本特殊陶業株式会社 | Processing equipment, manufacturing method of molded product, and manufacturing method of electrodes for spark plugs |
CN112808925B (en) * | 2021-02-02 | 2024-07-19 | 鹏驰五金制品(昆山)有限公司 | Semicircular bolt forming equipment |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1636691A (en) * | 1923-09-20 | 1927-07-26 | Richard M Heames | Apparatus for trimming blanks |
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 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1428174A (en) * | 1920-04-22 | 1922-09-05 | John A Luther | Die structure |
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 |
US5373720A (en) * | 1992-09-03 | 1994-12-20 | Water Gremlin Company | Method of making battery terminal with necked flange |
JP3699346B2 (en) * | 2000-11-06 | 2005-09-28 | 株式会社阪村機械製作所 | Manufacturing method of grooved nut |
-
2003
- 2003-03-18 EP EP03784731A patent/EP1425141B1/en not_active Expired - Lifetime
- 2003-03-18 AU AU2003225790A patent/AU2003225790A1/en not_active Abandoned
- 2003-03-18 DE DE60305130T patent/DE60305130T2/en not_active Expired - Lifetime
- 2003-03-18 JP JP2004527534A patent/JP3919119B2/en not_active Expired - Lifetime
- 2003-03-18 CN CN03801228.6A patent/CN1282510C/en not_active Expired - Lifetime
- 2003-03-18 CA CA002454527A patent/CA2454527A1/en not_active Abandoned
- 2003-03-18 WO PCT/US2003/007832 patent/WO2004014620A1/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1636691A (en) * | 1923-09-20 | 1927-07-26 | Richard M Heames | Apparatus for trimming blanks |
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 |
Non-Patent Citations (1)
Title |
---|
See also references of WO2004014620A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60305130T2 (en) | 2006-12-21 |
AU2003225790A1 (en) | 2004-02-25 |
EP1425141B1 (en) | 2006-05-10 |
WO2004014620A1 (en) | 2004-02-19 |
CA2454527A1 (en) | 2004-02-19 |
JP2005519772A (en) | 2005-07-07 |
DE60305130D1 (en) | 2006-06-14 |
CN1282510C (en) | 2006-11-01 |
EP1425141A1 (en) | 2004-06-09 |
JP3919119B2 (en) | 2007-05-23 |
CN1564727A (en) | 2005-01-12 |
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