GB846283A - Method of making an extended life coil spring - Google Patents

Method of making an extended life coil spring

Info

Publication number
GB846283A
GB846283A GB447/57A GB44757A GB846283A GB 846283 A GB846283 A GB 846283A GB 447/57 A GB447/57 A GB 447/57A GB 44757 A GB44757 A GB 44757A GB 846283 A GB846283 A GB 846283A
Authority
GB
United Kingdom
Prior art keywords
temperature
coiling
bar
springs
making
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
GB447/57A
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.)
American Steel Foundries
Original Assignee
American Steel Foundries
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 American Steel Foundries filed Critical American Steel Foundries
Publication of GB846283A publication Critical patent/GB846283A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F35/00—Making springs from wire
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Wire Processing (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

846,283. Making springs; altering physical structure. AMERICAN STEEL FOUNDRIES. Jan. 4, 1957 [July 10, 1956], No. 447/57. Classes 83 (2) and 83 (4). A method of making an extended life coil spring from a bar of spring steel comprising a single heating of the bar to a temperature suitable for coiling and above its upper critical temperature, next coiling the bar and finally subjecting the coiled bar to shot peening is characterized in that, after the coiling and before the shot peening, the bar is quenched before it has cooled to a temperature below its lower critical temperature. The coiling temperature for carbon steel is approximately 1625‹ F. and alloy steels approximately 1575‹ F. During the coiling operation an electronic device automatically rejects any workpiece the temperature of which has fallen below the minimum quench temperature of 1450‹ F. Following the oil quench the springs are tempered within the range of 200‹ to 1000‹ F. and preferably at 800‹ F. and may be preset by setting them solid a plurality of times. Upon completion of the set-down operation or upon cooling from the tempering if the springs are not set-down, the springs are shot peened to extend their fatigue life.
GB447/57A 1956-07-10 1957-01-04 Method of making an extended life coil spring Expired GB846283A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA846283X 1956-07-10

Publications (1)

Publication Number Publication Date
GB846283A true GB846283A (en) 1960-08-31

Family

ID=4172673

Family Applications (1)

Application Number Title Priority Date Filing Date
GB447/57A Expired GB846283A (en) 1956-07-10 1957-01-04 Method of making an extended life coil spring

Country Status (1)

Country Link
GB (1) GB846283A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368638A1 (en) * 1988-11-08 1990-05-16 Sumitomo Electric Industries, Ltd. Method of producing a high-strength coil spring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368638A1 (en) * 1988-11-08 1990-05-16 Sumitomo Electric Industries, Ltd. Method of producing a high-strength coil spring

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