FR2445743A1 - Drop-forging process for forming bolt heads - uses blind hole in matrix or punch to centre billet during pressing thus eliminating burrs - Google Patents

Drop-forging process for forming bolt heads - uses blind hole in matrix or punch to centre billet during pressing thus eliminating burrs

Info

Publication number
FR2445743A1
FR2445743A1 FR7900137A FR7900137A FR2445743A1 FR 2445743 A1 FR2445743 A1 FR 2445743A1 FR 7900137 A FR7900137 A FR 7900137A FR 7900137 A FR7900137 A FR 7900137A FR 2445743 A1 FR2445743 A1 FR 2445743A1
Authority
FR
France
Prior art keywords
matrix
punch
drop
billet
forging process
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
Application number
FR7900137A
Other languages
French (fr)
Other versions
FR2445743B1 (en
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.)
BADRE EMILE
Original Assignee
BADRE EMILE
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 BADRE EMILE filed Critical BADRE EMILE
Priority to FR7900137A priority Critical patent/FR2445743A1/en
Priority to FR7915321A priority patent/FR2457139A2/en
Priority to BE0/195551A priority patent/BE876749A/en
Publication of FR2445743A1 publication Critical patent/FR2445743A1/en
Application granted granted Critical
Publication of FR2445743B1 publication Critical patent/FR2445743B1/fr
Granted legal-status Critical Current

Links

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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool

Landscapes

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

Abstract

The hot or cold-drop-forging process is used to form a hexagonal bolt head or similar shape on a metal billet, incorporating a matrix hole (3) by which the billet is centered and eliminating burrs. The billet may comprise a cut length of round bar which is subdivided into primary and secondary axial zones, the former being reshaped to form the head. A blind circular hole (3) centres the primary zone at the initiation of deformation, being provided in central position on the punch or in the matrix. The matrix (1) may have a square cavity (2) with a plane base, the centering hole (3) being sited axially in the base. Alternatively the hole may be formed by a circular coaxial rib which rises above the base level.
FR7900137A 1979-01-04 1979-01-04 Drop-forging process for forming bolt heads - uses blind hole in matrix or punch to centre billet during pressing thus eliminating burrs Granted FR2445743A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7900137A FR2445743A1 (en) 1979-01-04 1979-01-04 Drop-forging process for forming bolt heads - uses blind hole in matrix or punch to centre billet during pressing thus eliminating burrs
FR7915321A FR2457139A2 (en) 1979-01-04 1979-05-25 Hollow bolt or screw head - may be worked hot or cold and has central cavity with external wall with segments
BE0/195551A BE876749A (en) 1979-01-04 1979-06-01 NEW HEADS OF SCREWS, BOLTS, PULLERS OR THE LIKE, WHICH CAN BE HOT OR COLD DIE, WITHOUT BURNS, AS WELL AS THE PROCESS AND TOOLS USEFUL THEREFORE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7900137A FR2445743A1 (en) 1979-01-04 1979-01-04 Drop-forging process for forming bolt heads - uses blind hole in matrix or punch to centre billet during pressing thus eliminating burrs

Publications (2)

Publication Number Publication Date
FR2445743A1 true FR2445743A1 (en) 1980-08-01
FR2445743B1 FR2445743B1 (en) 1985-01-11

Family

ID=9220457

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7900137A Granted FR2445743A1 (en) 1979-01-04 1979-01-04 Drop-forging process for forming bolt heads - uses blind hole in matrix or punch to centre billet during pressing thus eliminating burrs

Country Status (2)

Country Link
BE (1) BE876749A (en)
FR (1) FR2445743A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102688938B (en) * 2012-05-28 2015-02-18 宁波市鄞州剑均机械科技有限公司 Hot stamping mould of screw stud

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2832970A (en) * 1954-10-04 1958-05-06 Camcar Screw & Mfg Corp Single blow heading machine with two part header punch
FR1348113A (en) * 1963-02-11 1964-01-04 Illinois Tool Works Method and apparatus for forming the head of a tie rod
FR1544193A (en) * 1967-09-22 1968-10-31 Method and tooling for the manufacture of socket head screws, or the like
FR2213118A1 (en) * 1972-11-21 1974-08-02 Utility Products Ltd

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2832970A (en) * 1954-10-04 1958-05-06 Camcar Screw & Mfg Corp Single blow heading machine with two part header punch
FR1348113A (en) * 1963-02-11 1964-01-04 Illinois Tool Works Method and apparatus for forming the head of a tie rod
FR1544193A (en) * 1967-09-22 1968-10-31 Method and tooling for the manufacture of socket head screws, or the like
FR2213118A1 (en) * 1972-11-21 1974-08-02 Utility Products Ltd

Also Published As

Publication number Publication date
FR2445743B1 (en) 1985-01-11
BE876749A (en) 1979-10-01

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Legal Events

Date Code Title Description
ST Notification of lapse