US3367639A - Continuous strip heating apparatus - Google Patents

Continuous strip heating apparatus Download PDF

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Publication number
US3367639A
US3367639A US478301A US47830165A US3367639A US 3367639 A US3367639 A US 3367639A US 478301 A US478301 A US 478301A US 47830165 A US47830165 A US 47830165A US 3367639 A US3367639 A US 3367639A
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US
United States
Prior art keywords
strip
liquid
heating
edges
continuous
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 - Lifetime
Application number
US478301A
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English (en)
Inventor
Ashley P Bock
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric 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
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US478301A priority Critical patent/US3367639A/en
Priority to BE685244D priority patent/BE685244A/xx
Application granted granted Critical
Publication of US3367639A publication Critical patent/US3367639A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • ABSTRACT OF THE DISCLOSURE An apparatus for continuous heating of coated metal strip such as electrolytically-coated low-carbon-steel tinplate strip to alter the condition of such coating by passing the strip through an induction heating coil, wherein miscoloration at the edges of the strip due to overheating at such locations is prevented by use of means for applying a volatile non-coloring liquid to such edges prior to subjection to such induction heating coil.
  • the aforementioned object is realized by inclusion of means for applying a quantity of volatile liquid to the portions of such strip which tend to overheat, for extracting the excess heat applied thereto continuously by the heating means.
  • FIGURE 1 illustrates exaggeratedly a typical cold-rolled cross-sectional configuration of metal strip in which the edges are thinner than the mid portion of such strip;
  • FIG. 2 is a schematic representation of apparatus for inductively heating continuous metal strip, as embodying a means for preventing overheating of the edges of such strip; the view in FIG. 2 being from a direction in which a face of the moving strip is being observed;
  • FIG. 3 is a view of the apparatus shown in FIG. 2, as observed from the edge of the moving strip in the direction of the arrow 3;
  • FIG. 4 is a view of an alternate embodiment of the invention taken from a position in which a face of the moving strip is being observed;
  • FIG. 5 is a view taken along the line 5-5 in FIG. 4;
  • FIG. 6 is a modification of the apparatus shown in FIGS. 2 and 3.
  • FIG. 1 there is shown therein a cross-sectional view of cold-rolled metal strip material 10 which is thinner at its edges than at its mid portion.
  • the taper has been shown in FIG. 1 exaggeratedly and as a continuous variation from the edges to the midportion of the strip. It is not known precisely what the particular shape is in practice, aside that a certain percentage of the width of the edges of the strip is thinner than the mid portion of the strip and tends to become overheated during continuous travel of the strip through an induction heating coil means 11. The precise shape of such strip is not critical with respect to applicants invention.
  • the edges of metal strip tend to become discolored when heated by passage, of such strip in continuous fashion through a heating station employing such as an induction heating coil means, during such as a tin-fusion-heating process, where the strip may have a nominal thickness of about 5 mils and it is intended to heat such strip uniformly throughout its width to a temperature in the region of 700 F., for example.
  • the excessive temperature may be due in part to the nature of the heating effect as imparted by the heating means at the heating station through which the strip passes, and/ or due to the thinner edges of the strip material.
  • the overheating is prevented in the present invention by applying a quantity of volatile liquid to the edges of such strip in that region of the strip which tends to be subjected to the overheating and/ or discoloration.
  • the overheatpreventing liquid is preferably one which is transparent and aflords no protective coating in itself. Water appears to be a desirable liquid in view of its relatively high latent heat of evaporation and its transparency.
  • roller applicators 14 which are provided with a suitable absorbent cover 15 constructed and arranged to consecutively be subjected to a pool of liquid 16 and to the edges of the strip 10 to eifect rolling transfer of liquid from such pool to the critical edge areas of the strip during travel past such applicators and into and through the induction heating coil means 11.
  • the liquid 16, such as water, thus applied by rolling action onto the strip will travel with the strip into the heating coil 11 wherein the heating of the strip by such coil will result in evaporation of the liquid and extraction of heat from the areas subjected to the liquid and prevent such areas from becoming overheated by the induction heating of the strip.
  • a pair of similar roller applicators 14 may be disposed on each side of the moving strip.
  • advancement of the strip 10 past the roller applicators 14 and through the induction heating coil means 11 may be effected by suitable conventional means (not shown).
  • FIG. 6 illustrates a modification of the apparatus shown in FIGS. 2 and 3, and employs nozzles 22 for applying makeup of overheat-preventing liquid to the absorbent surfaces 15 of the roller applicators 14, in lieu of the liquid reservoir arrangement shown in FIGS. 2 and 3.
  • the amount of liquid applied to the strip by the roller applicators is controlled by nozzle flow.
  • FIGS. 4 and 5 discloses an alternate construction in which the overheat-preventing liquid 16 may be applied to the strip edges directly by way of nozzles 26 constructed and arranged to direct the overheat-preventing liquid 16 onto the critical areas of the strip.
  • the adhering and distribution properties of such liquid as applied to the strip may be improved when necessary by addition of wetting agent, such as ethylene-glycol, or a suitable one of the aryl alkyl sodium sulfonates, or other suitable wetting agent.
  • wetting agent such as ethylene-glycol, or a suitable one of the aryl alkyl sodium sulfonates, or other suitable wetting agent.
  • Apparatus for the continuous heating of coated metal strip material which tends to become overheated and thereby miscolored at its edge portions when subjected to continuous heating, said apparatus comprising a heating station including induction heating means through which the strip is moved continuously, and means for applying a noncoloring volatile liquid exclusively to said edge portions of such strip prior to subjection to said heating means for absorbing an amount of heat from the strip during heating by such heating means sufficient to prevent overheating and miscoloration of such edge portions.
  • roller applicator means for engaging faces of the selected widthwise portions of the strip to transfer liquid thereto, together with a means for continuously replenishing the liquid to the roller applicator means.
  • Apparatus as set forth in claim 1, wherein the means for applying liquid to the selected widthwise portions of the strip comprises nozzles for spraying liquid directly onto such strip.
  • coated metal strip is electrolytically-coated low-carbonsteel tin-plated strip.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
US478301A 1965-08-09 1965-08-09 Continuous strip heating apparatus Expired - Lifetime US3367639A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US478301A US3367639A (en) 1965-08-09 1965-08-09 Continuous strip heating apparatus
BE685244D BE685244A (enrdf_load_stackoverflow) 1965-08-09 1966-08-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US478301A US3367639A (en) 1965-08-09 1965-08-09 Continuous strip heating apparatus

Publications (1)

Publication Number Publication Date
US3367639A true US3367639A (en) 1968-02-06

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Application Number Title Priority Date Filing Date
US478301A Expired - Lifetime US3367639A (en) 1965-08-09 1965-08-09 Continuous strip heating apparatus

Country Status (2)

Country Link
US (1) US3367639A (enrdf_load_stackoverflow)
BE (1) BE685244A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017096387A1 (en) * 2015-12-04 2017-06-08 Wiswall James Methods of cooling an electrically conductive sheet during transverse flux induction heat treatment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US337978A (en) * 1886-03-16 thompson
US1887504A (en) * 1931-01-13 1932-11-15 Thomas H Frost Manufacture of fine edged blades
US2673080A (en) * 1950-05-03 1954-03-23 Surface Combustion Corp Strip heating
US2679574A (en) * 1949-09-27 1954-05-25 Westinghouse Electric Corp Conduction heating of metallic strip
US2783788A (en) * 1950-07-13 1957-03-05 Rene Van Loo Device and method for hardening sheet metal
US3144364A (en) * 1960-11-14 1964-08-11 Westinghouse Electric Corp Induction annealing of magnetic alloy sheet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US337978A (en) * 1886-03-16 thompson
US1887504A (en) * 1931-01-13 1932-11-15 Thomas H Frost Manufacture of fine edged blades
US2679574A (en) * 1949-09-27 1954-05-25 Westinghouse Electric Corp Conduction heating of metallic strip
US2673080A (en) * 1950-05-03 1954-03-23 Surface Combustion Corp Strip heating
US2783788A (en) * 1950-07-13 1957-03-05 Rene Van Loo Device and method for hardening sheet metal
US3144364A (en) * 1960-11-14 1964-08-11 Westinghouse Electric Corp Induction annealing of magnetic alloy sheet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017096387A1 (en) * 2015-12-04 2017-06-08 Wiswall James Methods of cooling an electrically conductive sheet during transverse flux induction heat treatment
CN108778542A (zh) * 2015-12-04 2018-11-09 奥科宁克公司 在横向磁通感应热处理期间冷却导电片材的方法

Also Published As

Publication number Publication date
BE685244A (enrdf_load_stackoverflow) 1967-01-16

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