CA2454527A1 - Cold-headed standoff - Google Patents
Cold-headed standoff Download PDFInfo
- Publication number
- CA2454527A1 CA2454527A1 CA002454527A CA2454527A CA2454527A1 CA 2454527 A1 CA2454527 A1 CA 2454527A1 CA 002454527 A CA002454527 A CA 002454527A CA 2454527 A CA2454527 A CA 2454527A CA 2454527 A1 CA2454527 A1 CA 2454527A1
- Authority
- CA
- Canada
- Prior art keywords
- punch
- die
- fastener
- head
- fastener blank
- 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
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
Abstract
A process for cold forging a metal fastener such as a self-clinching standof f includes a punch and die set at the final head trimming station which produces the shear burr only on the underside of the fastens head where it is not visible after installation. At this station, a fastener blank (16) having a tubular barrel and a temporarily formed circular head is placed into a bore of the punch (23) with a bagel of the fastener residing in the bore with the 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 (12) shears metal from around the edges of the circular head of the fastener blan k. Moment of the die stops when the cutting edge lies beyond the underside of the head of the fastener. At this point, a knock-out pin (21) which is reciprocal within the bore of the punch forcibly ejects the fastener through a passage in the die to a point beyond an opposite side of the die. The forging apparatus then moves the die away from the punch and, once the die is clear of the punch, a stripper sleeve (25) which is reciprocal about the outside surface of the punch moves from a retracted position over the end of the pun ch removing a residual scrap ring (18) from around the outside of the punch.
Description
I ~
2 The pit invention relates to the formation of a self-clinching type metal 3 fastener by a progressive forging process.
4 BACKGROUND AND DE$CRIP7ITON OF THE PRIia,IR ART
Internally-threaded, self-cund~irtg type fastener are wdl-known in the art.
6 When inatallod, they provide materials such as poet metal panels with a threaded 7 structure to receive s straw so that dements can be securod to the panel. A
typical 8 self clinching falter of the standoff type which includes an elongate band is shown 9 in Figures 3 and 4. The basic structures of this type of thsteners include a head, a self clinch groove, a band, and an interns! bore with threads. The fastener is installed by a I 1 press and anvil so that the groove receives the cold flow of metal from the sheet while 12 the polygond head is embeddad into the sheet. These structures secure the fastener to 13 the sheet rigidly, both axially and rotationally.
I 4 One effective means for producing a self clinching fastener of the above-I 5 describe type is by a progressive die forging procxas. This process utilizes sequential 16 punch and die forging to create the head, the clinch groove, the band, and the internal 17 bore of the fastener from a metal blank or slug. Such a formation process is described 18 for example in U.S. Patent Application Serial No. 2002/0054806 entitled "Grooved 19 Nut and Manufacturing Method Thereof' Bled on January 3, 2001 by Sakamura et al.
and published on May 9, 2002, 'this document discloses the progressive punch and 1 die tooling used in this proc~a as exemplified by Figure 3. As shown in this figure, a 2 horizontally rcapro~ing ram holds a series of punches, each opposite a respective die 3 providing a aeries of forging stations. The punchy and dies prograsaively form the 4 basic shape oftha fastener from a blank of metal which is moved between stations after each stroke of the ram. The shearing action betvve~ the punch and die of the 6 final station trims metal from wound the edge of a temporarily formed araiiar head of 7 the fastener as the blank is pushed through the die by the punch to create the final 8 polygonal shape.
9 A problan eats with this n~atwi~ttring process, however, because the shearing process in the last station of the progressive forging leaves an undesirable 11 upward-facing burr on the top side of the head of the fastener. ~
Furthermore, there is 12 another problem with this 6na1 head trirnrning station in that the scrap ring which 13 results from cutting the material away from the periphery of the aralar head to 14 achieve the firu~t polygonal shape often sticks to the face of the trim die, obaweting the continuous operation of the progressive forging process. There is therefore a need 16 in the art to utilize a cold forging process to create a self-clinching fastener which does 17 not have these deficiencies.
18 ~19,~Y OF
19 The present invention has been devised to curs the above-described problems of the undesirable nuuaifa~ring burt on the head of the faata~er and to effect the 21 efTicient ranova! of the trimmed scrap ring at the final station of the head trimming 22 station of the forging process. ~Acxording to one aspect of the invention, the ~org<ng 1 apparatus of the prior art is modified in that the punch and dio tooling in the head 2 trimming station are reversed in position. That i~ the punch is posisi~ed on the die 3 block while the die is located on the redprocatiag punch block. This reverses the 4 direction of relative movement between the fastener and the die so that the burr is formed on the underside of the head rather than the top side. This is moro 6 desirable since the underside of the head is embedded into the sheet material once the 7 fastener is applied to a sheet. The bufr is then not vis~'ble snd cannot affect the Real 8 appearance of the clinched assembly. Because in the new system the barrel of the 9 fastener is necessarily held within a cavity of the trim punch at the last station, an added reaprocatirtg la~oclc-out pin is employed to eject the part from the punch and 11 through the opposite aide of the die.
12 Re~nersing the relative dirxtion of movement between the die and the fastener 13 during head-trimming also leaves the scrap ring wound the outside of the punch at the 14 final station rather than against the face of the die as in the prior art.
This is advamageous since the scrap ring then may be quickly and reliably removed from 16 around the trim punch by a stripper sleeve which pushes the scrap ring off the aid of 17 the trim punch aRer the trim process is completed. This avoids the unreliable scrap t 8 removal of the prior art. AdditionaDy, this is also advantageous in xparating the 19 finished product from the scrap material, whereby also eliminating the need for costly sorting or manual inspection operations to remove the scrap from the finished product.
21 Steps of the forging process of the imrention at the final head-trimnting station 22 may be further descn'bed as follows. The fastener blank having a tubular barrel and a I teTnporan7y formed cirarlar head is placid into s boro of a punch with the band of the 2 fastener roaiding in the boro sad an underside of the Grailar head abutting an end face 3 of the punch. T'he forging apparstua then moves the die toward the top side of the 4 fastener until a polygonal artting edge of the die shears natal from around the edges of the circular head of the fastener blank. Movement of the die steps when the cutting b edge lies beyond the punch end face and the underside of the head of the fastener. At ? this point, a knock-out pin which is reciprocal within the bore of the punch forceably 8 ejects the fwa through a passage in the die and beyond an opposite side of the die 9 into a container for completed parts. The forging apparst<ra then moves the die away from the punch. Once the die is clear of the punch, a stripper sleeve which is 11 reciprocal about the outside aurthx of the punch moves from a retracted position over 12 the end of the punch and in doing so ranoves a scrap ring left around the outside of 13 the punch. Since the orientation ofthe tooWvg is horizontal, the sexap ring the falls 14 away from the punch by gravity, and may also be assisted by prossurized oil or air to ensuro the dowrnvard motion of the scrap ring is achieved. The cycle is then l6 completed and the trim station is now ready to rocxive the next partially formed 1 ? fastener blank.
18 The apparatus for performing the inv~a~tive.head-ttin~ming process comprises a 19 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 21 the bore, and a polygonal shank. Tire im~on Rather includes n reciprocal die having 2Z an internal passage and a trim plats including an aperturo, the trim plate aperture 1 having a circutftterattiai polygonal edge closely cornesponding to dinta>Sions of the 2 shank of the punch for receiving the putsch. The die is moval~e from a r~racxed 3 position toward a top aide of the fastens blank to an axtended trim position where the 4 cutting edge lies bayond the punch end face. There is a knock-out pin reciprocal within the punch born for ejecting the fastener blank 8~om the bore alts through the die 6 passage to an opposite aide of the die. A stripper slave slidably mounted to the 7 outside surface of the punch is taapmcal betvveert rested and extended positions by 8 a spring-activated mecharomt, the extended position placing a distal end of the sleeve 9 even w'tth the punch end face for removing a soap ring from the punch. Sinca the die is movable in a substantially horimntal plane, the a<xap ring falls away from the end 11 face of the punch by the force of gravity and can be assisted by pressurized oil and or 12 air as needed. Other objects and advantages of the present invention will be readily 13 apparent to those of skill in the art from the following drawings a~
description of the 14 preferred embodiments.
16 Figure 1 is a top diagranunatic view of a prior art multi-station cold forging 17 apparatus.
18 Figure 2 is a top plan view diagtatr><natically showir4g the cold forging 19 apparatus of the present invention.
Figure 3 is a aide partial cross section view of a fastaur formed by the prior art 21 method.
22 Figure 4 is a partial cross section view with an enlarged area of a fas<a~er 1 produced by the pre:mrt inveatioa 2 Figure 5 is an exploded isometric aa:embly view ofttm various alements of the 3 present invention corresponding to forging station number six shown in Figure 2.
4 Figures 6A through 6D aro side elevation partial cut-away views of the cold forging apparatus of the prexnt inva~tion atwvNng its sequential operation.
Internally-threaded, self-cund~irtg type fastener are wdl-known in the art.
6 When inatallod, they provide materials such as poet metal panels with a threaded 7 structure to receive s straw so that dements can be securod to the panel. A
typical 8 self clinching falter of the standoff type which includes an elongate band is shown 9 in Figures 3 and 4. The basic structures of this type of thsteners include a head, a self clinch groove, a band, and an interns! bore with threads. The fastener is installed by a I 1 press and anvil so that the groove receives the cold flow of metal from the sheet while 12 the polygond head is embeddad into the sheet. These structures secure the fastener to 13 the sheet rigidly, both axially and rotationally.
I 4 One effective means for producing a self clinching fastener of the above-I 5 describe type is by a progressive die forging procxas. This process utilizes sequential 16 punch and die forging to create the head, the clinch groove, the band, and the internal 17 bore of the fastener from a metal blank or slug. Such a formation process is described 18 for example in U.S. Patent Application Serial No. 2002/0054806 entitled "Grooved 19 Nut and Manufacturing Method Thereof' Bled on January 3, 2001 by Sakamura et al.
and published on May 9, 2002, 'this document discloses the progressive punch and 1 die tooling used in this proc~a as exemplified by Figure 3. As shown in this figure, a 2 horizontally rcapro~ing ram holds a series of punches, each opposite a respective die 3 providing a aeries of forging stations. The punchy and dies prograsaively form the 4 basic shape oftha fastener from a blank of metal which is moved between stations after each stroke of the ram. The shearing action betvve~ the punch and die of the 6 final station trims metal from wound the edge of a temporarily formed araiiar head of 7 the fastener as the blank is pushed through the die by the punch to create the final 8 polygonal shape.
9 A problan eats with this n~atwi~ttring process, however, because the shearing process in the last station of the progressive forging leaves an undesirable 11 upward-facing burr on the top side of the head of the fastener. ~
Furthermore, there is 12 another problem with this 6na1 head trirnrning station in that the scrap ring which 13 results from cutting the material away from the periphery of the aralar head to 14 achieve the firu~t polygonal shape often sticks to the face of the trim die, obaweting the continuous operation of the progressive forging process. There is therefore a need 16 in the art to utilize a cold forging process to create a self-clinching fastener which does 17 not have these deficiencies.
18 ~19,~Y OF
19 The present invention has been devised to curs the above-described problems of the undesirable nuuaifa~ring burt on the head of the faata~er and to effect the 21 efTicient ranova! of the trimmed scrap ring at the final station of the head trimming 22 station of the forging process. ~Acxording to one aspect of the invention, the ~org<ng 1 apparatus of the prior art is modified in that the punch and dio tooling in the head 2 trimming station are reversed in position. That i~ the punch is posisi~ed on the die 3 block while the die is located on the redprocatiag punch block. This reverses the 4 direction of relative movement between the fastener and the die so that the burr is formed on the underside of the head rather than the top side. This is moro 6 desirable since the underside of the head is embedded into the sheet material once the 7 fastener is applied to a sheet. The bufr is then not vis~'ble snd cannot affect the Real 8 appearance of the clinched assembly. Because in the new system the barrel of the 9 fastener is necessarily held within a cavity of the trim punch at the last station, an added reaprocatirtg la~oclc-out pin is employed to eject the part from the punch and 11 through the opposite aide of the die.
12 Re~nersing the relative dirxtion of movement between the die and the fastener 13 during head-trimming also leaves the scrap ring wound the outside of the punch at the 14 final station rather than against the face of the die as in the prior art.
This is advamageous since the scrap ring then may be quickly and reliably removed from 16 around the trim punch by a stripper sleeve which pushes the scrap ring off the aid of 17 the trim punch aRer the trim process is completed. This avoids the unreliable scrap t 8 removal of the prior art. AdditionaDy, this is also advantageous in xparating the 19 finished product from the scrap material, whereby also eliminating the need for costly sorting or manual inspection operations to remove the scrap from the finished product.
21 Steps of the forging process of the imrention at the final head-trimnting station 22 may be further descn'bed as follows. The fastener blank having a tubular barrel and a I teTnporan7y formed cirarlar head is placid into s boro of a punch with the band of the 2 fastener roaiding in the boro sad an underside of the Grailar head abutting an end face 3 of the punch. T'he forging apparstua then moves the die toward the top side of the 4 fastener until a polygonal artting edge of the die shears natal from around the edges of the circular head of the fastener blank. Movement of the die steps when the cutting b edge lies beyond the punch end face and the underside of the head of the fastener. At ? this point, a knock-out pin which is reciprocal within the bore of the punch forceably 8 ejects the fwa through a passage in the die and beyond an opposite side of the die 9 into a container for completed parts. The forging apparst<ra then moves the die away from the punch. Once the die is clear of the punch, a stripper sleeve which is 11 reciprocal about the outside aurthx of the punch moves from a retracted position over 12 the end of the punch and in doing so ranoves a scrap ring left around the outside of 13 the punch. Since the orientation ofthe tooWvg is horizontal, the sexap ring the falls 14 away from the punch by gravity, and may also be assisted by prossurized oil or air to ensuro the dowrnvard motion of the scrap ring is achieved. The cycle is then l6 completed and the trim station is now ready to rocxive the next partially formed 1 ? fastener blank.
18 The apparatus for performing the inv~a~tive.head-ttin~ming process comprises a 19 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 21 the bore, and a polygonal shank. Tire im~on Rather includes n reciprocal die having 2Z an internal passage and a trim plats including an aperturo, the trim plate aperture 1 having a circutftterattiai polygonal edge closely cornesponding to dinta>Sions of the 2 shank of the punch for receiving the putsch. The die is moval~e from a r~racxed 3 position toward a top aide of the fastens blank to an axtended trim position where the 4 cutting edge lies bayond the punch end face. There is a knock-out pin reciprocal within the punch born for ejecting the fastener blank 8~om the bore alts through the die 6 passage to an opposite aide of the die. A stripper slave slidably mounted to the 7 outside surface of the punch is taapmcal betvveert rested and extended positions by 8 a spring-activated mecharomt, the extended position placing a distal end of the sleeve 9 even w'tth the punch end face for removing a soap ring from the punch. Sinca the die is movable in a substantially horimntal plane, the a<xap ring falls away from the end 11 face of the punch by the force of gravity and can be assisted by pressurized oil and or 12 air as needed. Other objects and advantages of the present invention will be readily 13 apparent to those of skill in the art from the following drawings a~
description of the 14 preferred embodiments.
16 Figure 1 is a top diagranunatic view of a prior art multi-station cold forging 17 apparatus.
18 Figure 2 is a top plan view diagtatr><natically showir4g the cold forging 19 apparatus of the present invention.
Figure 3 is a aide partial cross section view of a fastaur formed by the prior art 21 method.
22 Figure 4 is a partial cross section view with an enlarged area of a fas<a~er 1 produced by the pre:mrt inveatioa 2 Figure 5 is an exploded isometric aa:embly view ofttm various alements of the 3 present invention corresponding to forging station number six shown in Figure 2.
4 Figures 6A through 6D aro side elevation partial cut-away views of the cold forging apparatus of the prexnt inva~tion atwvNng its sequential operation.
7 Figure 1 diagrammatically depicts the cold forging apparatus of the prior art 8 which includes reciprocating punch block 1 1 that holds a series of punches 8 that 4 strokes toward and away from die block 13 that holds a aaioa of dies 9 to perform a sequential forging of a metal slug 13 into the general shape of a standard type self 11 clinching fastener as shown in Figure 3. This prior art apparatus and the apparatus of 12 the present tion both utilize six forging stations, Sl through S6, beginning with a 13 first station in which metal slug 1~ has been severed from a rod-like substrate material 14 17 and ending with the final sixth station whero the cylindrical head is trinuned to a I S hexagonal shape on a fully formed part. The slug is sequentially moved between I6 stations from one die atvity to the next after each stroke of the punch block by a 17 transfer mechanism well known in the art (not shown). The invention lies within the 18 apparatus and operation of the sixth and f nal forn~ing station where the circular head 19 of the fastens blank is trimmed to a hexagons! shape.
Referring now to Figure 2, the fifth and sucth stations of the present invention 21 are depicted, stations 1-5 being essentially the same as shown in the prior art device of 22 Figure I . One of the aspects of the invention is the r~va~sal of punch 8 and die 9 1 den»ta of tire previous rtations so that the die sssanbhr 12 of the invention at the 2 sixth station is held by the reap<ocating punch block 11 while the punch assembly 14 3 is fixed in the stationary die block 13. By rovasarrg the position of these dements, the 4 direction of the head trimming sheer is reversed. Also, sa will be tirrther described, the finished pare is ejected through the punch block rather than filling through the 6 stationary die block 13 as in the prior art.
7 Charging the direction of trim operation has the bene8aal effect on the surface 8 charaaeriatics of the fastener head as depicted by Figuros 3 and 4. Aa shown in Figure 9 3, the prior art method of cold forging shown in figure 1 results in an upward-facing trim burr which protrudes from the head of the fastener. This burr is a rough and 11 sharp edge which is aesihdicaUy w~irsble. Using the apparatus of the presets 12 invention however the burr, which inevitably results from the die shearing method of 13 trirnrning the head to its final hexagonal shape, now along the underside surface 14 of the head of the fastaror. Since after installation the head of the fastener is embedded in a substrate material, the trim burr is not visible and the top surthce of the 16 head of the fastener is flush with the outside surface of the substrate exhibiting an 17 aesthetically acceptable final appearance after assembly.
18 Referting now to Figure 5, the various el~ts of the invention at the sixth 19 station shown in Figuro 2 aro depicted further including the resulting finished part 16 and the trim scrap ring i8. Trim die is includes trim plats 2~ that has a hexagonal 21 opening with a eutang edge along its inside surface. Punch assembly 14 includes a 22 holder 19 that rigidly secures hexagonal punch Z3. The punch assembly farther 1 includes a stripper sleeve Z5 snd a lrnock-out pin Zi that aro alidable within the 2 assembly relative to the fixed punch Z3 and holder 19. Means to effect the motion of 3 the stripper sleeve and the knock-out pin aro not :ho~m and are wolf within the knowledge of one of akin in the art.
Referring now to Figuros 6A through 6D, the four stages of the trim process 6 using the apparatus depictod in >figure 5 aro shown in sequence. Referring fast to ? Figuro 6A, the ~ blank 16 is delivered by a t:auafar mechanism (not shown) so 8 that a baml of the resides within the cylindrical bore of a hexagonal punch 9 which is rigidly secured within holder 19. The first step in the trim process begins with the motion of the die iZ toward the fast. In this position, the underside of the 11 circular head IS of the fastener blank abuts an end face of the punch.
12 Referring now to Figure 68, the die has moved to the end of its stroke to the 13 completed trim position. A cutting edge on the trim plate Z? on the facx of the die has 14 savored a scrap ring 18 from tire fartener blank which is shearod by the punch 23 from the circular hcad of the fas<amr to provide a re~lting hexagonal shape. The 16 hexagonal head now resides within a passage of the die beyond a backside of the trim 17 plate.
18 The next step of the operation of the invention is shown in Figure 6C. The 19 knock-out pin 21 which is preferably apiing-loadad (spring mechanism not shown) is released and forceably ejects the finished fastener 16 through the die passage 20 and 21 away from an opposite side of the die falling away by the force of gravity as depicted 22 by the arrows shown in this figure. It should be noted at this stage that the scrap ring 1 18 remains around the outside of the punch Z3.
2 The fowl stage of the operation of thin station is ahovm in Figuro 6D in which 3 several events occur ainwltaneous)y. While the die 12 is being withdrawn to its home 4 position, the lrnock-out pin 2i is retracted and stripper sleave t5 is extended to a point flush with the ~d face of the punch, forcing the a~xap ring 18 off of the end of the 6 punch and away from the apparatus by gravity as shown by the arrows.
Thereafter, 7 the stripper sleeve 25 is ~tru~ed to its home position sash with the endface of holder 8 19. Now the el~ta of the punch assembly are in the same position shown in 1~;gure 9 6A ready to accept the next fa~ener from the transfer mechanism and the cycle is thus complete.
11 it should be understood that them may be other modi8~cationa and changes to 12 the present inva~tion that will be obvious to those of skill in the art from the foregoing 13 descxiption, however, the present im~aon should be limited only by the following 14 claims and their legal equivalents.
Referring now to Figure 2, the fifth and sucth stations of the present invention 21 are depicted, stations 1-5 being essentially the same as shown in the prior art device of 22 Figure I . One of the aspects of the invention is the r~va~sal of punch 8 and die 9 1 den»ta of tire previous rtations so that the die sssanbhr 12 of the invention at the 2 sixth station is held by the reap<ocating punch block 11 while the punch assembly 14 3 is fixed in the stationary die block 13. By rovasarrg the position of these dements, the 4 direction of the head trimming sheer is reversed. Also, sa will be tirrther described, the finished pare is ejected through the punch block rather than filling through the 6 stationary die block 13 as in the prior art.
7 Charging the direction of trim operation has the bene8aal effect on the surface 8 charaaeriatics of the fastener head as depicted by Figuros 3 and 4. Aa shown in Figure 9 3, the prior art method of cold forging shown in figure 1 results in an upward-facing trim burr which protrudes from the head of the fastener. This burr is a rough and 11 sharp edge which is aesihdicaUy w~irsble. Using the apparatus of the presets 12 invention however the burr, which inevitably results from the die shearing method of 13 trirnrning the head to its final hexagonal shape, now along the underside surface 14 of the head of the fastaror. Since after installation the head of the fastener is embedded in a substrate material, the trim burr is not visible and the top surthce of the 16 head of the fastener is flush with the outside surface of the substrate exhibiting an 17 aesthetically acceptable final appearance after assembly.
18 Referting now to Figure 5, the various el~ts of the invention at the sixth 19 station shown in Figuro 2 aro depicted further including the resulting finished part 16 and the trim scrap ring i8. Trim die is includes trim plats 2~ that has a hexagonal 21 opening with a eutang edge along its inside surface. Punch assembly 14 includes a 22 holder 19 that rigidly secures hexagonal punch Z3. The punch assembly farther 1 includes a stripper sleeve Z5 snd a lrnock-out pin Zi that aro alidable within the 2 assembly relative to the fixed punch Z3 and holder 19. Means to effect the motion of 3 the stripper sleeve and the knock-out pin aro not :ho~m and are wolf within the knowledge of one of akin in the art.
Referring now to Figuros 6A through 6D, the four stages of the trim process 6 using the apparatus depictod in >figure 5 aro shown in sequence. Referring fast to ? Figuro 6A, the ~ blank 16 is delivered by a t:auafar mechanism (not shown) so 8 that a baml of the resides within the cylindrical bore of a hexagonal punch 9 which is rigidly secured within holder 19. The first step in the trim process begins with the motion of the die iZ toward the fast. In this position, the underside of the 11 circular head IS of the fastener blank abuts an end face of the punch.
12 Referring now to Figure 68, the die has moved to the end of its stroke to the 13 completed trim position. A cutting edge on the trim plate Z? on the facx of the die has 14 savored a scrap ring 18 from tire fartener blank which is shearod by the punch 23 from the circular hcad of the fas<amr to provide a re~lting hexagonal shape. The 16 hexagonal head now resides within a passage of the die beyond a backside of the trim 17 plate.
18 The next step of the operation of the invention is shown in Figure 6C. The 19 knock-out pin 21 which is preferably apiing-loadad (spring mechanism not shown) is released and forceably ejects the finished fastener 16 through the die passage 20 and 21 away from an opposite side of the die falling away by the force of gravity as depicted 22 by the arrows shown in this figure. It should be noted at this stage that the scrap ring 1 18 remains around the outside of the punch Z3.
2 The fowl stage of the operation of thin station is ahovm in Figuro 6D in which 3 several events occur ainwltaneous)y. While the die 12 is being withdrawn to its home 4 position, the lrnock-out pin 2i is retracted and stripper sleave t5 is extended to a point flush with the ~d face of the punch, forcing the a~xap ring 18 off of the end of the 6 punch and away from the apparatus by gravity as shown by the arrows.
Thereafter, 7 the stripper sleeve 25 is ~tru~ed to its home position sash with the endface of holder 8 19. Now the el~ta of the punch assembly are in the same position shown in 1~;gure 9 6A ready to accept the next fa~ener from the transfer mechanism and the cycle is thus complete.
11 it should be understood that them may be other modi8~cationa and changes to 12 the present inva~tion that will be obvious to those of skill in the art from the foregoing 13 descxiption, however, the present im~aon should be limited only by the following 14 claims and their legal equivalents.
Claims (5)
1. A fastener blank head-trimming device utilized in a cold-forging apparatus, comprising:
a stationary punch holder, a punch having a bore for holding a barrel portion of a fastener blank including an end face for supporting an underside of a head portion of said fastener blank held in said bore and having a polygonal shank; and a die having an internal passage and a trim plate including an aperture, said trim plate aperture having a circumferential polygonal cutting edge closely corresponding to dimensions of the shank of said punch for receiving said punch, said die being movable coaxially relative to said punch from a retracted position toward a top side of said fastener blank to an extended trim position where said cutting edge lies beyond the punch face.
a stationary punch holder, a punch having a bore for holding a barrel portion of a fastener blank including an end face for supporting an underside of a head portion of said fastener blank held in said bore and having a polygonal shank; and a die having an internal passage and a trim plate including an aperture, said trim plate aperture having a circumferential polygonal cutting edge closely corresponding to dimensions of the shank of said punch for receiving said punch, said die being movable coaxially relative to said punch from a retracted position toward a top side of said fastener blank to an extended trim position where said cutting edge lies beyond the punch face.
2. The apparatus of claim 1 further including a knock-out pin reciprocal within said punch born for ejecting said fastener blank from said bore and through said die passage to an opposite aide of said die.
3. The apparatus of claim 2 further including a stripper sleeve slidably mounted to the outside surface of said punch, said sleeve being movable between retracted and extended positions, said extended position placing a distal end of said sleeve beyond said punch end face for removing a scrap ring from said punch.
4. The apparatus of claim 3 wherein said die is movable in a substantially horizontal plane and said scrap ring falls away from the end face of said punch by the force of gravity upon removal from said punch.
5. The method of head trimming a fastener blank in a cold-forging process, comprising:
placing a fastener blank into a bore of a punch having an end face;
supporting an underside of a head portion of said fastener blank with said punch end face;
moving a die having an internal passage and a trim plate with a cutting edge toward said fastener blank;
shearing the head of said fastener blank with the cutting edge of the trim plate;
stopping movement of said die at an extended trim position where said cutting edge lies beyond an underside of the head portion of said fastener blank;
ejecting said fastener blank from said punch bore and through said die passage to an opposite side of the die;
retracting said die; and removing a scrap ring from around the punch by moving a stripper sleeve slidably mounted to the outside surface of said punch until said scrap ring is pushed off the end face of the punch by said sleeve.
placing a fastener blank into a bore of a punch having an end face;
supporting an underside of a head portion of said fastener blank with said punch end face;
moving a die having an internal passage and a trim plate with a cutting edge toward said fastener blank;
shearing the head of said fastener blank with the cutting edge of the trim plate;
stopping movement of said die at an extended trim position where said cutting edge lies beyond an underside of the head portion of said fastener blank;
ejecting said fastener blank from said punch bore and through said die passage to an opposite side of the die;
retracting said die; and removing a scrap ring from around the punch by moving a stripper sleeve slidably mounted to the outside surface of said punch until said scrap ring is pushed off the end face of the punch by said sleeve.
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 (1)
| Publication Number | Publication Date |
|---|---|
| CA2454527A1 true CA2454527A1 (en) | 2004-02-19 |
Family
ID=31713805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002454527A Abandoned CA2454527A1 (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 (3)
| 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 |
Family Cites Families (10)
| 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 (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 WO PCT/US2003/007832 patent/WO2004014620A1/en active IP Right Grant
- 2003-03-18 DE DE60305130T patent/DE60305130T2/en not_active Expired - Lifetime
- 2003-03-18 CA CA002454527A patent/CA2454527A1/en not_active Abandoned
- 2003-03-18 JP JP2004527534A patent/JP3919119B2/en not_active Expired - Lifetime
- 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 CN CN03801228.6A patent/CN1282510C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE60305130D1 (en) | 2006-06-14 |
| JP2005519772A (en) | 2005-07-07 |
| JP3919119B2 (en) | 2007-05-23 |
| DE60305130T2 (en) | 2006-12-21 |
| CN1282510C (en) | 2006-11-01 |
| EP1425141A4 (en) | 2004-06-30 |
| EP1425141B1 (en) | 2006-05-10 |
| WO2004014620A1 (en) | 2004-02-19 |
| CN1564727A (en) | 2005-01-12 |
| EP1425141A1 (en) | 2004-06-09 |
| AU2003225790A1 (en) | 2004-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |