GB1095802A - Improvements in or relating to torsion springs - Google Patents

Improvements in or relating to torsion springs

Info

Publication number
GB1095802A
GB1095802A GB17848/65A GB1784865A GB1095802A GB 1095802 A GB1095802 A GB 1095802A GB 17848/65 A GB17848/65 A GB 17848/65A GB 1784865 A GB1784865 A GB 1784865A GB 1095802 A GB1095802 A GB 1095802A
Authority
GB
United Kingdom
Prior art keywords
bars
machining
steel
heating
final diameter
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.)
Expired
Application number
GB17848/65A
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of GB1095802A publication Critical patent/GB1095802A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/14—Torsion springs consisting of bars or tubes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Springs (AREA)

Abstract

Torsion bars for deformable mechanical connections such as suspension springs are produced from rolled, extruded or drawn steel bars from which the decarburized layer has been re-moved by machining or abrasion by subjecting steel bars after machining to final diameter to a surface heat treatment comprising surface heating to above the transformation temperature of the steel, e.g. 875 DEG C., and then quenching, the duration of the heating being such that the interior of the bars is an annealed structure or the structure obtained during the production of the steel bars. The surface hardening is preferably carried out by continuously passing the bars through an induction heater followed by an oil or a water sprinkler. Flame or torch heating may alternatively be used. The process is especially suitable for bars of unalloyed carbon steel containing 0.35 to 0.50% C. and impurity limits of 0.04% P, 0.035% S and 0.065% S+P. After machining to final diameter, the anchoring head at the ends of the bars may be roughened out by hot forging and given final form by machining or cold forming. After surface hardening, the bars may be tortionally deformed.
GB17848/65A 1964-04-29 1965-04-28 Improvements in or relating to torsion springs Expired GB1095802A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR972870A FR1402106A (en) 1964-04-29 1964-04-29 Rectilinear torsion springs and their manufacturing process

Publications (1)

Publication Number Publication Date
GB1095802A true GB1095802A (en) 1967-12-20

Family

ID=8829015

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17848/65A Expired GB1095802A (en) 1964-04-29 1965-04-28 Improvements in or relating to torsion springs

Country Status (5)

Country Link
DE (1) DE1483022C2 (en)
ES (1) ES312228A1 (en)
FR (1) FR1402106A (en)
GB (1) GB1095802A (en)
OA (1) OA01701A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999052746A1 (en) * 1998-04-14 1999-10-21 Breed Automotive Technology, Inc. Seat belt retractor with torsion bar
WO2000021802A1 (en) * 1998-10-13 2000-04-20 Breed Automotive Technology, Inc. Seat belt retractor having a torsion bar

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE938376C (en) * 1942-10-02 1956-01-26 Oberhuetten Vereinigte Obersch Method and device for the heat treatment of steels rolled with high specific rolling pressures
DE969024C (en) * 1942-10-21 1958-04-24 Deutsche Edelstahlwerke Ag Procedure for avoiding fatigue fractures on hardened valve springs
DE944135C (en) * 1944-05-03 1956-07-05 Oberhuetten Vereinigte Obersch Process for the production of highly stressed objects, e.g. of torsion bar springs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999052746A1 (en) * 1998-04-14 1999-10-21 Breed Automotive Technology, Inc. Seat belt retractor with torsion bar
WO2000021802A1 (en) * 1998-10-13 2000-04-20 Breed Automotive Technology, Inc. Seat belt retractor having a torsion bar

Also Published As

Publication number Publication date
FR1402106A (en) 1965-06-11
DE1483022B1 (en) 1970-12-10
OA01701A (en) 1969-12-15
ES312228A1 (en) 1965-07-01
DE1483022C2 (en) 1975-09-11

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