WO1981003632A1 - Ensemble a poincon et matrice - Google Patents

Ensemble a poincon et matrice Download PDF

Info

Publication number
WO1981003632A1
WO1981003632A1 PCT/AU1981/000072 AU8100072W WO8103632A1 WO 1981003632 A1 WO1981003632 A1 WO 1981003632A1 AU 8100072 W AU8100072 W AU 8100072W WO 8103632 A1 WO8103632 A1 WO 8103632A1
Authority
WO
WIPO (PCT)
Prior art keywords
fastener head
punch
die
faces
working
Prior art date
Application number
PCT/AU1981/000072
Other languages
English (en)
Inventor
K Castles
Original Assignee
K Castles
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 K Castles filed Critical K Castles
Publication of WO1981003632A1 publication Critical patent/WO1981003632A1/fr

Links

Classifications

    • 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
    • B21J13/02—Dies or mountings therefor
    • 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
    • B21K1/463—Making machine elements bolts, studs, or the like with heads with recessed heads

Definitions

  • This invention relates to an improved punch and die, an assembly of the punch and die in combination and a method using the assembly for forming into a fastener head a slot.
  • the invention finds a use in the cold forming of fasteners, in particular the heads of fasteners.
  • the present invention is described in relation to the production of a slot in a blank screw head, but is equally applicable to other types of fasteners such as bolts .
  • the saw or grinder was usually constructed of special materials to compensate for its narrow width. Further, if a plurality of slots in either one or various directions across the screw head was desired, the screw head was required, for example, to make a number of passes in the same or different directions over the saw or grinder, or more sophisticated and expensive cutting or grinding procedures were necessary.
  • the present invention has been found to alleviate or at least minimize the problems found in the conventional methods for forming a slot and it is simple to use and convenient in operation.
  • DISCLOSURE OF THE INVENTION One aspect of the present invention provides a punch and die assembly.
  • the punch for forming into a fastener head an open-ended slot having side walls and a base wall comprises a body portion having an end face; and a working tongue extending from the end face, said tongue having two sets of opposed side faces, each side face extending from the end face of the body portion and terminating at or near an end section, one set of opposed sides faces being relatively wide when compared to the other "edge" set of opposed side faces; the construction and arrangement being such that when in use, the relatively wide side faces form the side walls of the slot in the fastener head and the base wall of the slot conforms to the shape of the end section.
  • the die for supporting a fastener blank having a shank and a head into which a slot is to be formed, at one end of the shank comprises a body portion having a working face; a bore located within the body portion and comprising a fastener- head receiving recess and a shank receiving portion, the fastener head receiving recess communicating with and extending between the shank receiving portion and the working face of the body portion and having greater cross-section than the shank receiving portion, the fastener head receiving recess Being generally of complimentary shape to the fastener head but having further at least two cavities, each defined by a wall or walls extending inwardly into the body portion; the construction and arrangement being such that .the cavities will receive burrs when formed from the fastener head during a slot forming operation.
  • a method for forming into a fastener head an open- ended slot having side walls and a base wall using the punch and die assembly comprising supporting the fastener head in the die; and working the fastener head with the working tongue of the punch to form the slot in the
  • the body portion of the punch is in the form of an elongated member.
  • the member may be of any suitable transverse cross-sectional shape, for example, circular or rectangular, but a substantially cylindrical elongated member will be hereinafter described.
  • the cylindrical elongated member has an end face receivable in the die.
  • the end face is flat and has substantially upwardly extending peripheral side walls which are continuous and capable of being received in the die.
  • the working tongue extends from the end face in the opposite direction to the side walls and is preferably integral with the face.
  • the working tongue may take many but preferably has a substantially rectangular cross- section formed by the two sets of opposed side faces which extend from the end face of the body portion and terminate at or near the end section of the tongue.
  • the end section may be of substantially flat configuration with the edge faces of the tongue substantially normal to the end section giving the appearance of a rectangular tongue or with the edge faces diverging away from the end section giving the appearance of a frusto conical tongue.
  • the end section may have a concave recess, preferably centrally disposed between the edge faces , and again these edge faces may be normal to, or diverge from, the end section toward the end face of the body portion.
  • the concave recess may be angular, thereby giving the tongue a W-shaped appearance, or smoothly curved.
  • the end section may be in the form of an inverted channel section recess by formed extending the edge faces and adjacent relatively wide faces of the working tongue to form outwardly extending teeth, having inner and outer edge faces , the outer edge faces of the teeth being continuous extensions of the working tongue edge faces and the inner edge faces of the teeth being parallel to each other and merging with a substantially flat or concave, base of the channel.
  • a substantially flat slot base wall is obtained while a concave end section yields a base wall of substantially convex configuration when the base wall is viewed from the head of the screw along the longitudinal axis of the screw shank.
  • the length of the end section of the working tongue of the punch may be equal to, greater than, or less than the largest diameter of the screw head into which the slot is to be formed. It is preferable that the length of the end " section where it is of the inverted channel shape be less than the largest diameter of the screw head.
  • the punch of the present invention can be secured to a punch support means which means can move relative to the die into which the punch is received.
  • the punch can be made of any suitable material, preferably it is composed of known hard tooling steel.
  • the die of the present invention has a body ' portion into which the punch is received.
  • the body portion is in the form of an elongated member which may be of any suitable transverse cross-sectional shape such as circular or rectangular, but a substantially cylindrical elongated member will be hereinafter described.
  • the elongated die member preferably has the fastener head receiving recess and shank receiving portion forming a bore suitably located along its longitudinal axis and more preferably centrally located in the elongated member.
  • the shank receiving portion and the fastener head receiving recess are of sufficient cross-section to receive the shank of the blank screw and the head of the screw which is to be slotted.
  • the shank receiving portion and/or fastener head receiving recess may be lined with a suitable wear resistant material, such as tungsten carbide and are preferably adapted to receive a replaceable sleeve made of suitable wear resistant material.
  • the elongated member of the die preferably has a working face adapted to receive and/or engage the punch.
  • the- shank receiving portion is of constant cross-section while the fastener head receiving recess has a cross-section which expands in the direction towards the working face of the die to form a stepped hollow for cooperating the end face and working tongue and/or the side walls of the punch.
  • the stepped hollow is comprised of two recesses.
  • the fastener head receiving recess communicates with the shank receiving portion and has a complimentary shape to that of the desired screw head into which a slot will be formed.
  • the fastener, head receiving recess may have substantially diverging side walls emanating ⁇ from the walls of the shank receiving portion thus accommodating a blank for a countersunk screw head.
  • the maximum diameter of the fastener head receiving recess is equal to or greater than the maximum diameter of the blank screw head.
  • the fastener head receiving recess there are also provided in the fastener head receiving recess at least two cavities which are preferably diametrically opposed one another and spaced around the fastener head receiving recess and preferably adapted to receive the or part of the working tongue of the punch and large enough to receive any burrs formed when forming the slot.
  • the cavities lie between the junction of the shank receiving portion and the fastener head receiving recess and the working face of the die.
  • the cavities also preferably extend outwardly and diverge away from or near the junction.
  • Each of the cavities is defined by a wall or walls which extend inwardly into the body portion of the die.
  • the second of the preferred two recesses preferably communicates with the fastener head receiving recess and has its base wall substantially normal with respect to the shank receiving portion walls.
  • the second recess is also provided with side walls which are preferably perpendicular to its own base wall and which are substantially normal with respect to the working face of the die.
  • the base wall of the second recess can be of any peripheral shape which will accommodate the punch. Preferably, it is circular.
  • the base wall of the second recess may be lined with a suitable wear resistant material or in another preferred form, a wear resistant ring of desired config- uration can be housed within the base and side walls of the second recess.
  • a wear resistant ring of desired config- uration can be housed within the base and side walls of the second recess.
  • those edges of the wear ring remote from the base and side walls of the second recess are chamfered to guide the punch or its end face when entering the die.
  • the presence of the wear resistant ring is found to assist in aligning the working tongue of the punch with the cavities in the fastener head receiving recess of the die.
  • the area of the base wall of the second recess exposed to the punch is preferably sufficient to accommodate the end face of the punch.
  • the die can also be supported by a die support means which means can be movable with respect to the punch and/or the punch support means.
  • the die can be made of any suitable materials, preferably it is composed of known hard tooling steel.
  • the screw blank can be inserted and removed from the die of the invention by any of the methods currently employed in the known cutting or grinding procedures . Further, it is found that "the slot can be formed in the blank screw head before or after a thread is rolled onto the screw shank.
  • Fig. 1 is a perspective view of a punch.
  • Figs. 2 and 3 are fragmentary side views of a punch with other embodiments of the working tongue of the punch.
  • Fig. 4 is a perspective view of a die.
  • Fig. 5 is a perspective view of another embodiment of die.
  • Fig. 6 is a cross-section view along line VI-VI in Fig. 4
  • Fig. 7 is a top plan view of the die in Fig. 5.
  • Fig. 8 is a cross-section view along line VIII- VIII in Fig. 7.
  • Figs. 1, 2 and 3 there are illustrated punches 9 having a cylindrical bodies 10 and an end faces 11, with working tongues 12.
  • the working tongue in Fig. 1 has. relatively wide faces 13, set of opposed "edge" side faces 14 and an end section 15. Teeth 16 extend outwardly from the end section 15, and are formed by extensions of the opposed relatively wide faces 13 and edge faces 14. Each of the teeth 16 has an inner edge face 17.
  • Fig. 2 illustrates a side view of the working tongue 12 of the punch 9.
  • the relatively wide faces 18 of the tongue are substantially parallel while the edge faces 19 diverge away from end section 20 toward the end face 11 of the punch.
  • Fig. 3 is a similar view to Fig. 2 but illustrates a substantially "W" shaped working tongue 21, having an end section 22 of concave configuration with edge faces 23 which diverge away from the end section toward the end face 11 of the punch.
  • the elongated die 50 comprises a cylindrical body 51 with a working face 52, with a mould 53 having a countersunk recess 54 for receiving a fastener head to be slotted by a punch; cylindrical bore 55 for receiving the fastener shank and cavities 56 which are large enough to receive part of the working tongue of a punch and/or burrs formed when working a fastener head with the punch.
  • the die of Fig. 5 has the same construction as that of Fig. 4 except that the working face 57 is stepped, a best shown in Fig. 8., to accommodate a wear resistant ring 58.
  • Fig. 6 and Fig 8. illustrate diametrically opposed cavities 56 spaced from the junction of the recess 54 and bore 55 and lying between that junction and the working face 52 of Fig. 4 and Fig. 6 or working face 57 of Fig. 5 and Fig. 8.
  • Each cavity 56 is defined by walls extending inwardly into the cylindrical body 51 of the die. That part 60 of the cavity-defining body portion wall 59, most closely adjacent to the cylindrical bore 55 extends initiall parallel with the cylindrical bore 55.
  • Each cavity 56 can be provided with an air inlet hole (not shown) to aid in re ⁇ ioving burrs captured in the cavity during the formation of the slot into the fastener head.
  • a fastener head blank is held in the die recess 54 and with its shank in bore 55, the working tongue 12 of the punch is brought into contact with and works upon the fastener head blank, so that the teeth 16 of the tongue pass through the head blank producing burrs upon the edge face 14 of the tongue which are received in the cavities 56 of the die.
  • Pressure is applied to the working tongue 12 through the punch 10 until the inner edge faces 17 of the teeth 16 of the tongue move past the walls 60 and into the cavities 56 to shear off burrs formed during the initial working operation. While the teeth 16 are shearing off the burrs, the end section 15 of the tongue is forming the base wall of the slot and the relatively wide faces are forming the slot side walls of the fastener head. It has been found with the present invention that a single slot or a number of slots having a desired base and side wall configuration can be formed using the punch and die of the present invention.

Landscapes

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

Abstract

Poincon (9) pour former dans une tete d'attache une fente a extremites ouvertes, ayant un corps (10) et une languette de travail (12) qui donne la configuration a la fente. Une matrice (50) de support de la tete d'attache possede un corps (51), un alesage (55) situe dans le corps pour recevoir le flan d'attache a poinconner par le poincon. Un procede de formation d'une fente dans la tete d'attache consiste (a) a supporter la tete d'attache dans la matrice (50) et (b) a travailler la tete d'attache avec la langue de travail (12) du poincon (9) pour former la fente.
PCT/AU1981/000072 1980-06-12 1981-06-12 Ensemble a poincon et matrice WO1981003632A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPE401980 1980-06-12
AU4019/80 1980-06-12

Publications (1)

Publication Number Publication Date
WO1981003632A1 true WO1981003632A1 (fr) 1981-12-24

Family

ID=3768562

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1981/000072 WO1981003632A1 (fr) 1980-06-12 1981-06-12 Ensemble a poincon et matrice

Country Status (3)

Country Link
EP (1) EP0053143A1 (fr)
AU (1) AU7185881A (fr)
WO (1) WO1981003632A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112719077A (zh) * 2020-12-15 2021-04-30 中国航发哈尔滨轴承有限公司 一种半圆头铆钉冲压头工装

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1805943A (en) * 1927-07-21 1931-05-19 Nat Machinery Co Method of and mechanism for trimming forgings
DE936179C (de) * 1953-05-29 1955-12-07 Sphinxwerke Mueller & Cie A G Einrichtung zum Entgraten geschlitzter Schrauben und aehnlicher Drehteile auf einem Schlitzapparat
AU2646963A (en) * 1962-02-28 1964-07-23 Illinois Toolworks Inc Improvement in method and apparatus for heading a fastener
AU5776369A (en) * 1969-07-10 1969-07-10 Punch and die devices
US3585666A (en) * 1967-03-18 1971-06-22 Eibes Kerb Konus Gmbh Apparatus for the manufacture of slotted fasteners
US3731516A (en) * 1970-07-09 1973-05-08 Kabel Metallwerke Ghh Method for making bevel gear
GB1406578A (en) * 1972-11-21 1975-09-17 Utility Products Pty Ltd Recess in fastening element head and method of making it
US4033003A (en) * 1975-11-07 1977-07-05 Briles Manufacturing Head forming method
GB1483139A (en) * 1974-09-28 1977-08-17 Kabel Metallwerke Ghh Apparatus for the production of bevel gears
US4160300A (en) * 1977-09-15 1979-07-10 Litton Systems, Inc. Hammer for forming an undercut fastener driving slot
AU3876378A (en) * 1977-12-27 1980-02-14 Braun Engineering Co. Cold forming
AU4383179A (en) * 1979-02-01 1980-08-07 Kevin Paul Castles Screws

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1805943A (en) * 1927-07-21 1931-05-19 Nat Machinery Co Method of and mechanism for trimming forgings
DE936179C (de) * 1953-05-29 1955-12-07 Sphinxwerke Mueller & Cie A G Einrichtung zum Entgraten geschlitzter Schrauben und aehnlicher Drehteile auf einem Schlitzapparat
AU2646963A (en) * 1962-02-28 1964-07-23 Illinois Toolworks Inc Improvement in method and apparatus for heading a fastener
US3585666A (en) * 1967-03-18 1971-06-22 Eibes Kerb Konus Gmbh Apparatus for the manufacture of slotted fasteners
AU5776369A (en) * 1969-07-10 1969-07-10 Punch and die devices
US3731516A (en) * 1970-07-09 1973-05-08 Kabel Metallwerke Ghh Method for making bevel gear
GB1406578A (en) * 1972-11-21 1975-09-17 Utility Products Pty Ltd Recess in fastening element head and method of making it
GB1483139A (en) * 1974-09-28 1977-08-17 Kabel Metallwerke Ghh Apparatus for the production of bevel gears
US4033003A (en) * 1975-11-07 1977-07-05 Briles Manufacturing Head forming method
US4160300A (en) * 1977-09-15 1979-07-10 Litton Systems, Inc. Hammer for forming an undercut fastener driving slot
AU3876378A (en) * 1977-12-27 1980-02-14 Braun Engineering Co. Cold forming
AU4383179A (en) * 1979-02-01 1980-08-07 Kevin Paul Castles Screws

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112719077A (zh) * 2020-12-15 2021-04-30 中国航发哈尔滨轴承有限公司 一种半圆头铆钉冲压头工装

Also Published As

Publication number Publication date
EP0053143A1 (fr) 1982-06-09
AU7185881A (en) 1981-12-17

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