GB835825A - Method and apparatus for the induction heating of billets and the like - Google Patents

Method and apparatus for the induction heating of billets and the like

Info

Publication number
GB835825A
GB835825A GB32904/57A GB3290457A GB835825A GB 835825 A GB835825 A GB 835825A GB 32904/57 A GB32904/57 A GB 32904/57A GB 3290457 A GB3290457 A GB 3290457A GB 835825 A GB835825 A GB 835825A
Authority
GB
United Kingdom
Prior art keywords
billet
temperature
surface temperature
furnace
stage
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
GB32904/57A
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.)
Park Ohio Holdings Inc
Original Assignee
Ajax Magnethermic Corp
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
Priority claimed from US618783A external-priority patent/US2859323A/en
Application filed by Ajax Magnethermic Corp filed Critical Ajax Magnethermic Corp
Publication of GB835825A publication Critical patent/GB835825A/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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Forging (AREA)
  • General Induction Heating (AREA)

Abstract

835,825. Forging; extruding. AJAX MAGNETHERMIC CORPORATION, [formerly MAGNETHERMIC CORPORATION]. Oct. 22, 1957 [Oct. 29, 1956], No. 32904/57. Drawings to Specification. Class 83 (4). [Also in Group XXXV] In order to evenly heat a thick metal billet (especially aluminium), in an induction furnace prior to forging or extruding, the furnace is automatically controlled (see Group XXXV) in two stages. In the first stage, full power is applied until the surface temperature of the billet reaches an upper limit (482‹ C.). This is higher than the temperature required for subsequent working, but not so high as to damage the billet. The surface temperature is then automatically maintained between this limit and a slightly lower temperature (474‹ C.) by intermittent energization of the furnace. This stage continues until the temperature difference between the centre and the surface of the billet falls to a first set value (28‹ C.) whereupon the datum setting of the automatic temperature control is shifted so as to maintain the surface temperature between a new top limit (465‹ C.) and the working temperature (460‹ C.). This second stage is terminated when the centre/ surface temperature difference falls to a second set value (3‹ C.). The billet is then automatically ejected from the furnace as soon as the intermittent heating allows the surface temperature to drop to the working value (460‹ C.). Specification 742,856 is referred to.
GB32904/57A 1956-10-29 1957-10-22 Method and apparatus for the induction heating of billets and the like Expired GB835825A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US835825XA 1956-10-29 1956-10-29
US1230439XA 1956-10-29 1956-10-29
US618783A US2859323A (en) 1956-10-29 1956-10-29 Differential temperature measurement on billets

Publications (1)

Publication Number Publication Date
GB835825A true GB835825A (en) 1960-05-25

Family

ID=27374567

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32904/57A Expired GB835825A (en) 1956-10-29 1957-10-22 Method and apparatus for the induction heating of billets and the like

Country Status (2)

Country Link
FR (1) FR1230439A (en)
GB (1) GB835825A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2251569A (en) * 1990-11-06 1992-07-15 Alform Alloys Ltd Continuous extrusion of pre-heated billets
CN104407642A (en) * 2014-12-01 2015-03-11 杭州电子科技大学 Temperature control method for continuous casting billet induction heating process, based on iterative learning control
CN112782972A (en) * 2019-11-07 2021-05-11 大族激光科技产业集团股份有限公司 Laser heating temperature control method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032740A (en) * 1975-04-07 1977-06-28 Illinois Tool Works Inc. Two-level temperature control for induction heating

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2251569A (en) * 1990-11-06 1992-07-15 Alform Alloys Ltd Continuous extrusion of pre-heated billets
CN104407642A (en) * 2014-12-01 2015-03-11 杭州电子科技大学 Temperature control method for continuous casting billet induction heating process, based on iterative learning control
CN104407642B (en) * 2014-12-01 2016-09-07 杭州电子科技大学 A kind of continuous casting billet sensing heating process temp. control method controlled based on iterative learning
CN112782972A (en) * 2019-11-07 2021-05-11 大族激光科技产业集团股份有限公司 Laser heating temperature control method
CN112782972B (en) * 2019-11-07 2022-12-02 大族激光科技产业集团股份有限公司 Laser heating temperature control method

Also Published As

Publication number Publication date
FR1230439A (en) 1960-09-15

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