EP0283669A2 - Procédé de fabrication d'une vis présentant une tête à empreinte cruciforme - Google Patents

Procédé de fabrication d'une vis présentant une tête à empreinte cruciforme Download PDF

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Publication number
EP0283669A2
EP0283669A2 EP88101202A EP88101202A EP0283669A2 EP 0283669 A2 EP0283669 A2 EP 0283669A2 EP 88101202 A EP88101202 A EP 88101202A EP 88101202 A EP88101202 A EP 88101202A EP 0283669 A2 EP0283669 A2 EP 0283669A2
Authority
EP
European Patent Office
Prior art keywords
screw
shaped
approximately
slots
head
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.)
Withdrawn
Application number
EP88101202A
Other languages
German (de)
English (en)
Other versions
EP0283669A3 (fr
Inventor
Luciano Salice
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.)
Arturo Salice SpA
Original Assignee
Arturo Salice SpA
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 Arturo Salice SpA filed Critical Arturo Salice SpA
Publication of EP0283669A2 publication Critical patent/EP0283669A2/fr
Publication of EP0283669A3 publication Critical patent/EP0283669A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/44—Making machine elements bolts, studs, or the like
    • B21K1/46—Making machine elements bolts, studs, or the like with heads
    • B21K1/463—Making machine elements bolts, studs, or the like with heads with recessed heads

Definitions

  • the invention relates to a method for producing a screw with a screw head with crossed slots, the flanks of which have an undercut in which a pressure acting in the axial direction is exerted on the screw head with a deforming tool.
  • Screw heads with an undercut, intersecting slots are known and enable the oblique attachment of a cross screwdriver, so that the screws can be screwed in even if the screwdriver cannot be inserted in alignment with the screw shaft in the cross slots.
  • the undercut flanks prevent the screwdriver from slipping off the flanks when it is at an angle and not finding a hold in the cross recesses.
  • a screw with a screw head with crossed slots is produced by a casting process, the screw blank cast from a cold-deformable metal having crossed slots with straight flanks parallel to one another and a spherical cap-shaped cap .
  • the parts of the spherical cap-shaped cap which laterally delimit the intersecting slots are then pressed in by a stamp in such a way that an approximately cylindrical section-shaped head with undercuts intersecting intersecting slots results.
  • This method of producing a screw is also relatively complex, since a screw blank must first be cast and then stamped with a stamp.
  • the object of the invention is therefore to provide a method of the type specified at the outset, according to which screws with screw heads can be produced in a simpler and more economical manner and have crossed slots provided with undercuts.
  • this object is achieved in a method of the generic type in that an essentially cylindrical section made of wire or the like.
  • Asl screw blank is inserted into a die and pressure is exerted on the head area with at least one stamp such that a central recess with a round cross-section and the intersecting slots are formed in the head area of the screw blank by thrust forming and then the slots are pressed in by those that are still deeper Slots separated parts with an approximately quarter-circular profile with curvature of the inner rounded edges to the outside are provided with a spherical cap-shaped head shape.
  • the screw shaft can be provided in one working step by shear forming with a suitably designed punch with a screw head whose crossed slots have undercuts whose shape corresponds approximately to the inner walls of the edge area of a space delimited by a flattened hollow sphere.
  • These undercuts enable the oblique approach of a Phillips screwdriver without it slipping off when the screw-in torque is applied, because the protruding upper counter flanks give the screwdriver the necessary hold.
  • the undercuts preventing slipping are formed by the method according to the invention in the intersection area of the slots in that the parts initially separated by the intersecting slots are pushed outward with an approximately quarter-circular cross-section, the upper inner edge areas being pressed inward and the inner areas thereof Arch the rounded edges outwards.
  • the undercut areas therefore do not form directly on the flanks of the cross slots, but on the rounded inner edges of the parts with an approximately quarter-circular profile between the crossing webs.
  • the pressure is expediently exerted with a stamp which is provided with a cup-shaped recess with a cruciform profile with a central projecting mandrel in such a way that the increasingly forming, approximately quarter-spherical-spherical parts with their heads against the dome-shaped domes separated between the webs forming the cruciform profile Butt the bottom of the cup-shaped recess and be arched outward in the form of a flattened hollow ball to form a space towering over by the areas of the tips of the quarter-ball-shaped parts.
  • the head region of the screw blank is expediently deformed by a stamp which is approximately frustoconical. After this first shear deformation step, the head region is then further deformed in the manner described above.
  • a screw head produced according to the method described above has edge regions which are curved outwards in the region of the base of the crossing webs.
  • the screw head is therefore expediently provided with a cut separating the edge region. This cut can be made using a punch. This cut separates an outer annular area from the screw head, so that it has a more attractive appearance with a lower cylindrical disk-shaped area.
  • a device for carrying out the method according to the invention with a die has a stamp with a cup-shaped recess with a dome-shaped arched base, which through a cross-shaped profile is divided, which consists of crossing webs, the end faces of which lie in a plane in the border region between the domed arched base and an outer region delimited by a substantially cylindrical wall, in the crossover region of the webs a mandrel provided with a flat tip is arranged.
  • the invention further relates to a screw with a head which has an approximately cylindrical disc-shaped area below a spherical region and is provided with intersecting slots dividing approximately quarter-spherical regions, the inwardly curved rounded inner tip regions of the quarter-ball spherical parts forming annular groove-shaped indentations in the foot regions protrude whose circumferential angle is approximately 45 ° and which delimit a space divided by the slots approximately in the form of a flattened hollow sphere.
  • the inner upper tip areas of the quarter-ball-shaped parts of the screw head are expediently chamfered approximately hollow. These chamfers favor the inclination of the oblique screwdriver. These chamfers are formed in the manufacture with the tool according to the invention by the method according to the invention through the flat-conical tip of the central mandrel of the stamp.
  • the screw shown in FIGS. 1 and 2 consists of a screw head 1 and a shaft 2, which consists of a threaded part 3 and a thread-free area 4, which is located between the thread and the head 1.
  • the head 1 consists of an upper spherical cap-shaped part 5 forming a cap and an approximately cylindrical disk-shaped region 6 adjoining it.
  • the screw head is provided with slots 7, 8 which intersect at right angles and which are formed by grooves with flanks parallel to one another and at right angles on the groove base are.
  • the screw head is provided in the screw axis with a recess 9 which is round in cross section and on which the slots intersect.
  • the slots 7, 8 divide the upper region of the screw head into four quarter-spherical-spherical parts 10.
  • the inner tip regions 11 of these quarter-spherical-spherical parts are bent inward and protrude annular groove-shaped indentations 12 in their foot regions.
  • the circumferential angles of the inner edges of these annular groove-shaped indentations are approximately 45 ° .
  • the annular groove-shaped recesses delimit a space divided by the slots, which is formed by bulges and has approximately the shape of a flattened hollow ball.
  • the upper inner tip areas of the quarter-ball-shaped parts are hollow above the annular groove-shaped recesses conical bevels 14 provided.
  • the screw shown in Figs. 1 and 2 is or the like from a substantially cylindrical portion of wire. manufactured, which forms a screw blank.
  • the stamp 16 has a cup-shaped recess 17 with a dome-shaped arched base 18.
  • the cup-shaped recess 17 is divided by a crossing profile, which consists of crossing webs 19.
  • the end faces of these webs 19 lie in a plane in the border area between the dome-shaped curved base of the cup-shaped recess and an outer area delimited by an essentially cylindrical wall.
  • a central mandrel 20 with a flat conical tip is provided in the intersection area of the webs 19. The tip of this mandrel 20 lies approximately in the area of the plane of the flat edge of the stamp 16.
  • the screw blank is inserted into a blind hole-like recess in the die 15.
  • the head region of the screw blank is shaped like a truncated cylinder with a punch (not shown).
  • This truncated cylindrical widening 21 can be seen in FIG. 4.
  • this frustoconical head area to the screw head is carried out with the punch 16.
  • the punch 16 is lowered, the flat cylindrical tip of the central mandrel 20 engages in the middle of the upper circular surface of the frustoconical part 21.
  • the intersecting webs 19 of the stamp also come under attack. Parts which have an approximately quarter-circular cross section are divided by the crossing webs 19 and bent outwards in the manner shown in FIG. 6.
  • these parts with a quarter-circular cross-section hit the dome-shaped curved base of the recess of the plunger 16 and are thereby pushed outwards, the inner edges of these parts becoming increasingly bulging in the manner shown in FIGS. 7 and 8.
  • the stamp is completely depressed, the parts with an approximately circular cross section have been formed into approximately quarter-spherical-spherical parts. In this case, a space has formed in the inner edge region of these quarter-ball-shaped parts, the shape of which roughly corresponds to a flattened hollow ball.
  • the chamfers 14 have been formed by the flat conical tip of the mandrel 20.
  • the outer edge of the screw head is punched out by a stamping tool, so that the edge regions pressed out of the outer ends of the intersecting slots are removed and the screw head has a lower flat cylindrical region.
  • the shaft of the screw blank provided with a screw head in the above manner is then provided with a thread in the usual way.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Bolts, Nuts, And Washers (AREA)
EP88101202A 1987-03-23 1988-01-27 Procédé de fabrication d'une vis présentant une tête à empreinte cruciforme Withdrawn EP0283669A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3709513 1987-03-23
DE19873709513 DE3709513A1 (de) 1987-03-23 1987-03-23 Verfahren zum herstellen einer schraube mit einem schraubenkopf mit gekreuzten schlitzen

Publications (2)

Publication Number Publication Date
EP0283669A2 true EP0283669A2 (fr) 1988-09-28
EP0283669A3 EP0283669A3 (fr) 1989-08-30

Family

ID=6323792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101202A Withdrawn EP0283669A3 (fr) 1987-03-23 1988-01-27 Procédé de fabrication d'une vis présentant une tête à empreinte cruciforme

Country Status (3)

Country Link
EP (1) EP0283669A3 (fr)
DE (1) DE3709513A1 (fr)
GB (1) GB2203075A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106862475A (zh) * 2017-02-23 2017-06-20 江苏天毅冷镦股份有限公司 内六角双头螺柱毛胚的冷镦生产工艺

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9403019U1 (de) * 1994-02-23 1995-06-22 Marker Deutschland Gmbh, 82438 Eschenlohe Kopf einer Einstellspindel oder Schraube mit Kreuzschlitz
US5671942A (en) * 1994-02-23 1997-09-30 Marker Deutschland Gmbh Front jaw for a ski binding
DE10044025B4 (de) * 2000-09-06 2012-04-05 Andreas Stihl Ag & Co. Vergaser für eine Brennkraftmaschine mit zumindest einer Einstellschraube
DE10046562C2 (de) * 2000-09-19 2002-11-14 Eska Saechsische Schraubenwerk Verfahren zur Herstellung einer Außensechsrundschraube und damit hergestellte Außensechsrundschraube

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304704A (en) * 1939-12-04 1942-12-08 Winslow Foster Screw
US2676510A (en) * 1950-09-23 1954-04-27 Nat Screw & Mfg Company Screw driver slot with driver wedging means
NL256512A (fr) * 1959-10-07
GB1067087A (en) * 1964-10-01 1967-05-03 Res Eng & Mfg Improvements in or relating to screws
US3151519A (en) * 1960-10-26 1964-10-06 Res Engineering And Mfg Inc Screw head recess, method of making the same, and punch for use therein
NL133564C (fr) * 1961-05-26
CH646498A5 (de) * 1980-05-07 1984-11-30 Faester Gmbh & Co Kg Schraube mit kreuzfoermig im schraubenkopf angeordneten schraubendrehschlitzen.
DE8114236U1 (de) * 1980-05-20 1981-09-24 Julius Blum Gesellschaft mbH, 6973 Höchst Drehelement, insbesondere Schraube
GB2129348B (en) * 1982-09-08 1986-09-24 Blum Gmbh Julius Screws
GB2188389A (en) * 1985-11-30 1987-09-30 Clive Alan Newbould Screw driving formations

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106862475A (zh) * 2017-02-23 2017-06-20 江苏天毅冷镦股份有限公司 内六角双头螺柱毛胚的冷镦生产工艺
CN106862475B (zh) * 2017-02-23 2018-12-25 江苏天毅冷镦股份有限公司 内六角双头螺柱毛胚的冷镦生产工艺

Also Published As

Publication number Publication date
EP0283669A3 (fr) 1989-08-30
GB8711935D0 (en) 1987-06-24
GB2203075A (en) 1988-10-12
DE3709513A1 (de) 1988-10-13

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