US3845539A - Apparatus for manufacturing steel sheets with layers of protective metal - Google Patents

Apparatus for manufacturing steel sheets with layers of protective metal Download PDF

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US3845539A
US3845539A US00384384A US38438473A US3845539A US 3845539 A US3845539 A US 3845539A US 00384384 A US00384384 A US 00384384A US 38438473 A US38438473 A US 38438473A US 3845539 A US3845539 A US 3845539A
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oil
rolls
powder
rolling mill
atomizing
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US00384384A
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H Yamagishi
F Yokoi
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JFE Engineering Corp
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Nippon Kokan Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/004—Filling molds with powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/06—Compressing powdered coating material, e.g. by milling

Definitions

  • This invention relates to apparatus for manufacturing a steel sheet coated with a protective metal, aluminum for example, by applying, a powder of the metal upon the surface of the steel sheet and then rolling the coated steel sheet, and more particularly relates to an apparatus for preventing the powder of the metal from adhering to the surface of rolls of the rolling mill.
  • Steel sheets are often coated with a powder of alumi-. num and then the coated steel sheets continuously pass through a rolling mill.
  • the rolls of the mill should, desirably have clean and dry surfaces. However, the cleaner the roll surfaces are, the more aluminum powder tends to adhere.
  • oil films formed on the surfaces of the rolls are effective to prevent the aluminum powder from adhering to the roll surfaces, the coating of the aluminum powder before rolling is easily permeated by oil, so that the quantity of the oil applied onto the roll surfaces should be small. If the quantity of the oil is excessive, for example more than 50 mg/m the aluminum powder tends to adhere to the rolls as if no oil film were formed thereon.
  • an apparatus for manufacturing a steel sheet coated with a layer of protective metal comprising a rolling mill including cooperating rolls between which a steel sheet coated with a powder of the protective metal is passed, means for electrostatically applying a small quantity of oil onto the surfaces of the rolls, and equalizing rolls cooperating with the rolls of the rolling mill for forming thin films of the oil on the surfaces of the rolls of the rolling mill.
  • FIG. 4 is a cross-sectional view of the nozzle shown in FIG. 3 taken along a line IV--- IV.
  • a steel sheet 1 coated with layers 2 of a powder of aluminum is rolled by passing it through the pair of rolls 3 of a l insmjlltqfarrnj s i sbsetha inssni tm aluminum layers 7.
  • the powder of aluminum tends to adhere on the surfaces of the rolls.
  • the powder of the aluminum adhering on the rolls with small bonding force can be readily removed by means of a doctor knife 6, for example, but those firmly adhering can not be readily removed.
  • the quantity of the applied oil should be in a range of from 5 mg/m to 50mg/m When the quantity of the oil is less than 5 mg/m aluminum powder tends to adhere to the surfaces of the rolls, whereas when the quantity of the oil exceeds 50 mg/m the oil permeates through the aluminum powder to reach the surface of steel sheet thereby decreasing the adhesiveness at the Al/Fe interface and causing the aluminum Lewd nowadays I9 adhere $99 syr aq aqtths. r9112- a The detail of the oiling device is shown in FIG. 2.
  • Oil 9 in an atomizing tank 8 is atomized by the primary pressurized air 10 ejected from a nozzle 11 and the concentration of the atomized oil is adjusted by the secondary air admitted into the atomizing tank 8.
  • the atomized oil is then ejected toward roll 3 through the slit 14 of a double walled nozzle 13.
  • an electrode 15 In front of the nozzle 13 is positioned an electrode 15 for ionizing the atomized oil ejected from slit 14.
  • a source of high voltage power is connected between the electrode 15 and roll 3 for causing the atomized oil to be charged at the electrode 15 and attached to the roll which is earthed to form a thin oil film on the surface of the roll.
  • FIGS. 3 and 4 show a modified nozzle 13 comprising concentric tubes 13a and 13b.
  • the outer tube 13a has an elongated slit l4 and theinner tube 13b is connected with the atomizing chamber 8 through a pipe 16 and is provided with a slit 13c in parallel with a slit 14 but on the opposite side.
  • the electrode may be provided in pipe 16 as at 15' as shown in FIG. 2.
  • the oil used may be a natural oil, such as cottonseed oil, or a synthetic oil such as .dioctyl sebacate.
  • a natural oil such as cottonseed oil
  • a synthetic oil such as .dioctyl sebacate.
  • mill oil of the aqueous emulsion type can also be .useds.
  • the equalizing rolls 4 may be made of felt, nonwoven synthetic fiber fabric or rubber.
  • the doctor knife '6 When made of metal, the doctor knife '6 not only removes the aluminum powder adhered to the r0113 but also serves as the grounding terminal of the roll. However, when the roll is grounded by another means, the doctor knife is not ne es a ily..l2q mal 9t'mtal.-.-- m"
  • the adjustment of the quantity of-the applied oil can be accomplished by varyingthe flow of the secondary air while maintaining the pressure of the primary or atomizing air at a definite value. Since the adequate quantity of the secondary air varies dependent upon the type of the used oil, it is advantageous to plot calibration curves for respective oils.
  • Oil films were formed under following conditions when aluminum layers having a thickness of 30 microns were formed by rolling on the surface of steel strips having a thickness of Q.8 mm.
  • Quantity Primary of se- Electro- Material Quantity Air condary static of equaof oil pressure air voltage lizing applied Example Kg/cm Oil Nm"'/min V roll mg/m l l dioctyl 2 40.000 felt sebacate 2 3.0 do. 6 do. do. 50 3 0.7 Cottonseed 6 do. nonwoven oil nylon fabric 4 1,5 t. 6 do. d0. 50 s 0.7 30% aqueous 5 do. nonwoven 20 emulsion of tetron* rayon oil 6 1.0 do. 6 do. do. 50
  • the rolling oil is electrostatically applied to the rollers it is possible to improve the efficiency of utilization of the oil and to minimize the quantity of the applied oil so that post treatment of degreasing is not necessary. Moreover, as the quantity of the applied oil is small, adhesion of the metal powder to the roll surface can be effectively prevented, thus assuring continuous rolling of metal coated steel plates having a beautiful surface finish.
  • Apparatus for manufacturing a steel sheet coated with a layer of protective metal comprising a rolling mill including:
  • the apparatus according to claim 1 which further comprises means for removing the powder of said metal from the surfaces of the rolls of said rolling mill.
  • equalizing rolls are made of a material selected from the group consisting of felt, non-woven synthetic fiber fabric and rubber.
  • said means for atomizing said oil comprises a tank containing said oil, an atomizing nozzle contained in said tank and supplied with pressurized air for atomizing said oil and means admitting secondary air into said tank for adjusting the concentration of the atomized oil.
  • said means for electrostatically applying said small quantity of oil applies a quantity per unit area of said oil onto the surfaces of said rolls ranging from 5 to 50mg/m 7.
  • said nozzle comprises a double-walled nozzle.
  • said means for varying the quantity of oil applied onto said rolls includes means for varying the secondary air flow while maintaining the pressure of the primary or atomizing air at a predetermined value.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

Apparatus manufacturing a steel sheet coated with a layer of protective metal wherein a powder of the metal is coated on the surface of the steel sheet and the coated steel sheet is dried and then rolled by means of a rolling mill to form a layer of the protective metal bonded to the surface of the steel sheet, a small quantity of atomized oil is electrostatically applied onto the surfaces of the rolls of the rolling mill and the applied oil is treated with equalizing rolls to form thin oil films of uniform thickness on the surfaces of the rolls whereby to prevent the powder of metal from adhering to the surfaces of the rolls.

Description

United States Patent Yamagishi et al. Nov. 5, 1974 APPARATUS FOR MANUFACTURING 2.107.541 2/193s Longm; 72/236 STEEL SHEETS WITH LAYERS 0F goehrirzg l 9 29/420 rasser PROTECTIVE METAL 2,764,508 9/1956 Feick ll7/93.4 R [75] Inventors: Hidehisa Yamagishi; Fumitoshi 3,478.843 ll/l969 Eckardt 184/626 Yokoi, both of Kawasaki Japan 3,648,497 3/1972 Long Cl Z1] 72/236 3,661,612 5/1972 Jackson et a]. 117 31 [73] Assignee: Nippon Kokan Kabushiki Kaisha,
Kamagawaken Japan Primary Examiner-C. W. Lanham [22] Filed: July 31, 1973 Assistant ExaminerE. M. Combs [21] Appl' NOJ 384,384 Attorney, Agent, or Firm-Flynn & Frishauf Related US. Application Data [57] ABSTRACT [62] Division of Ser, N01 259,287, June 2, 1972, Pat. No.
3,781,968. Apparatus manufacturing a steel sheet coated with a layer of protective metal wherein a powder of the [30] Foreign Application Priority Data metal is coated on the surface of the steel sheet and June 16,1971 Japan 46-42498 the Coated Steel Sheet is dried and rolled by means of a rolling mill to form a layer of the protec- 52 us. c1 29/420, 72/45, 72/236 five metal bonded the Surface of the Steel Sheet a 5 IL 0 1322f 1321b 45 m 1321b 27/06 small quantity of atomized oil is electrostatically ap- [58] Fie|d f Search 29/42() 4205; 72/41, 43, plied onto the surfaces of the rolls of the rolling mill 72/44, 5 117/31 934, 9343; 184/626 and the applied oil is treated with equalizing rolls to form thin oil films of uniform thickness on the sur- 5 References Cited faces of the rolls whereby to prevent the powder of UNITED STATES PATENTS metal from adhering to the surfaces of the rolls.
l,634.258 7/l927 Halpin 72/43 9 Claims, 4 Drawing Figures APPARATUS FOR MANUFACTURING STEEL SHEETS WITH LAYERS OF PROTECTIVE METAL This is a division, of application Ser. No. 259,287, filed June 2, 1972, now US. Pat. No. 3,781,968.
BACKGROUND OF THE INVENTION This invention relates to apparatus for manufacturing a steel sheet coated with a protective metal, aluminum for example, by applying, a powder of the metal upon the surface of the steel sheet and then rolling the coated steel sheet, and more particularly relates to an apparatus for preventing the powder of the metal from adhering to the surface of rolls of the rolling mill.
Steel sheets are often coated with a powder of alumi-. num and then the coated steel sheets continuously pass through a rolling mill. In such a case, the rolls of the mill should, desirably have clean and dry surfaces. However, the cleaner the roll surfaces are, the more aluminum powder tends to adhere. Although oil films formed on the surfaces of the rolls are effective to prevent the aluminum powder from adhering to the roll surfaces, the coating of the aluminum powder before rolling is easily permeated by oil, so that the quantity of the oil applied onto the roll surfaces should be small. If the quantity of the oil is excessive, for example more than 50 mg/m the aluminum powder tends to adhere to the rolls as if no oil film were formed thereon.
SUMMARY OF THE INVENTION It is an object of this invention to provide an-improved apparatus for preventing the metal powder from adhering to the surfaces of the rolls of the rolling mill whereby to manufacture a steel sheet coated with a layer of protective metal firmly bonded thereto and having a beautiful finished surface.
According to the present invention there is provided an apparatus for manufacturing a steel sheet coated with a layer of protective metal comprising a rolling mill including cooperating rolls between which a steel sheet coated with a powder of the protective metal is passed, means for electrostatically applying a small quantity of oil onto the surfaces of the rolls, and equalizing rolls cooperating with the rolls of the rolling mill for forming thin films of the oil on the surfaces of the rolls of the rolling mill.
BRIEF DESCRIPTION OF THE DRAWING FIG. 4 is a cross-sectional view of the nozzle shown in FIG. 3 taken along a line IV--- IV. I
DESCRIPTION OF THE PREFERRED QPl ENT With reference to FIG. 1 of the accompanying-drawing, a steel sheet 1 coated with layers 2 of a powder of aluminum is rolled by passing it through the pair of rolls 3 of a l insmjlltqfarrnj s i sbsetha inssni tm aluminum layers 7. Whenthe surfaces of the rolls 3 are I clean and dry, the powder of aluminum tends to adhere on the surfaces of the rolls. The powder of the aluminum adhering on the rolls with small bonding force can be readily removed by means of a doctor knife 6, for example, but those firmly adhering can not be readily removed. I
For this reason, it has been the practice to apply oil onto the surfaces of the rolls by means of oiling devices 5 and then forming uniform oil films by means of equalizing rolls 4. The quantity of the applied oil should be in a range of from 5 mg/m to 50mg/m When the quantity of the oil is less than 5 mg/m aluminum powder tends to adhere to the surfaces of the rolls, whereas when the quantity of the oil exceeds 50 mg/m the oil permeates through the aluminum powder to reach the surface of steel sheet thereby decreasing the adhesiveness at the Al/Fe interface and causing the aluminum Lewd?! I9 adhere $99 syr aq aqtths. r9112- a The detail of the oiling device is shown in FIG. 2. Oil 9 in an atomizing tank 8 is atomized by the primary pressurized air 10 ejected from a nozzle 11 and the concentration of the atomized oil is adjusted by the secondary air admitted into the atomizing tank 8. The atomized oil is then ejected toward roll 3 through the slit 14 of a double walled nozzle 13. In front of the nozzle 13 is positioned an electrode 15 for ionizing the atomized oil ejected from slit 14. A source of high voltage power, not shown, is connected between the electrode 15 and roll 3 for causing the atomized oil to be charged at the electrode 15 and attached to the roll which is earthed to form a thin oil film on the surface of the roll.
FIGS. 3 and 4 show a modified nozzle 13 comprising concentric tubes 13a and 13b. The outer tube 13a has an elongated slit l4 and theinner tube 13b is connected with the atomizing chamber 8 through a pipe 16 and is provided with a slit 13c in parallel with a slit 14 but on the opposite side. The electrode may be provided in pipe 16 as at 15' as shown in FIG. 2.
The oil used may be a natural oil, such as cottonseed oil, or a synthetic oil such as .dioctyl sebacate. However, mill oil of the aqueous emulsion type can also be .useds.
The equalizing rolls 4 may be made of felt, nonwoven synthetic fiber fabric or rubber. When made of metal, the doctor knife '6 not only removes the aluminum powder adhered to the r0113 but also serves as the grounding terminal of the roll. However, when the roll is grounded by another means, the doctor knife is not ne es a ily..l2q mal 9t'mtal.-.-- m" The adjustment of the quantity of-the applied oil can be accomplished by varyingthe flow of the secondary air while maintaining the pressure of the primary or atomizing air at a definite value. Since the adequate quantity of the secondary air varies dependent upon the type of the used oil, it is advantageous to plot calibration curves for respective oils.
V V EXAMPLE W Oil films were formed under following conditions when aluminum layers having a thickness of 30 microns were formed by rolling on the surface of steel strips having a thickness of Q.8 mm.
Quantity Primary of se- Electro- Material Quantity air condary static of equaof oil pressure air voltage lizing applied Example Kg/cm Oil Nm"'/min V roll mg/m l l dioctyl 2 40.000 felt sebacate 2 3.0 do. 6 do. do. 50 3 0.7 Cottonseed 6 do. nonwoven oil nylon fabric 4 1,5 t. 6 do. d0. 50 s 0.7 30% aqueous 5 do. nonwoven 20 emulsion of tetron* rayon oil 6 1.0 do. 6 do. do. 50
' Trademark In examples I, 3 and 5 no aluminum powder adhered to the surfaces of the rolls and it was possible to continuously manufacture aluminized steel sheets having beautiful surface finish without the necessity of using the doctor knife.
ln the cases of Examples 2, 4 and 6, however, since the quantity of the applied oil have exceeded the upper limit, aluminum powder often adhered to the surfaces of the rolls. However, it was possible to readily remove the powder with the doctor knife because the powder is adhering with a small bonding force, thus causing no trouble for the continuous production.
According to this invention, since the rolling oil is electrostatically applied to the rollers it is possible to improve the efficiency of utilization of the oil and to minimize the quantity of the applied oil so that post treatment of degreasing is not necessary. Moreover, as the quantity of the applied oil is small, adhesion of the metal powder to the roll surface can be effectively prevented, thus assuring continuous rolling of metal coated steel plates having a beautiful surface finish.
While the invention has been shown and described in terms of specific embodiments, it will be clear that many changes and modifications may be made without departing from the scope of the invention. For example, instead of atomizing the oil by pressurized air and then conveying the atomized oil onto the surfaces of the rolls by electrostatic force it is also possible to atomize the oil and then convey the atomized oil by the same electrostatic field as is well known in the art of electrostatic coating.
What is claimed is:
1. Apparatus for manufacturing a steel sheet coated with a layer of protective metal comprising a rolling mill including:
cooperating rolls between which a steel sheet coated with a powder ofthe protective metal ispassed means for electrostatically applying a small quantity of oil onto the surfaces of said rolls, said means for electrostatically applying said oil comprising means for atomizing said oil by means of primary and secondary pressurized air, a V nozzle for electrostatically ejecting the atomized oil towards said mill rolls, means for varying the quantity of oil applied onto said rolls by adjusting the primary and secondary pressurized air, and means for conveying the atomized oil ejected from said nozzle towards said rolls of said rolling mill by the action of an electro static field, and equalizing rolls cooperating with said rolls of said rolling mill for forming thin films of said oil on the surfaces of said rolls of said rolling mill. 2. The apparatus according to claim 1 which further comprises means for removing the powder of said metal from the surfaces of the rolls of said rolling mill.
3. The apparatus according to claim 1 wherein said equalizing rolls are made of a material selected from the group consisting of felt, non-woven synthetic fiber fabric and rubber.
4. The apparatus according to claim 1 wherein said means for atomizing said oil comprises a tank containing said oil, an atomizing nozzle contained in said tank and supplied with pressurized air for atomizing said oil and means admitting secondary air into said tank for adjusting the concentration of the atomized oil.
5. The apparatus according to claim 1 wherein said powder of protective metal is aluminum powder.
6. The apparatus according to claim 5 wherein said means for electrostatically applying said small quantity of oil applies a quantity per unit area of said oil onto the surfaces of said rolls ranging from 5 to 50mg/m 7. The apparatus according to claim 1 wherein said nozzle comprises a double-walled nozzle.
8. The apparatus according to claim 1 wherein said means for varying the quantity of oil applied onto said rolls includes means for varying the secondary air flow while maintaining the pressure of the primary or atomizing air at a predetermined value.
9. The apparatus according to claim 1 wherein said means for electrostatically applying said small quantity of oil applies a quantity per unit area of said oil onto the surfaces of said rolls ranging from 5 to SOmg/m".

Claims (9)

1. Apparatus for manufacturing a steel sheet coated with a layer of protective metal comprising a rolling mill including: cooperating rolls between which a steel sheet coated with a powder of the protective metal is passed, means for electrostatically applying a small quantity of oil onto the surfaces of said rolls, said means for electrostatically applying said oil comprising means for atomizing said oil by means of primary and secondary pressurized air, a nozzle for electrostatically ejecting the atomized oil towards said mill rolls, means for varying the quantity of oil applied onto said rolls by adjusting the primary and secondary pressurized air, and means for conveying the atomized oil ejected from said nozzle towards said rolls of said rolling mill by the action of an electrostatic field, and equalizing rolls cooperating with said rolls of said rolling mill for forming thin films of said oil on the surfaces of said rolls of said rolling mill.
2. The apparatus according to claim 1 which further comprises means for removing the powder of said metal from the surfaces of the rolls of said rolling mill.
3. The apparatus according to claim 1 wherein said equalizing rolls are made of a material selected from the group consisting of felt, non-woven synthetic fiber fabric and rubber.
4. The apparatus according to claim 1 wherein said means for atomizing said oil comprises a tank containing said oil, an atomizing nozzle contained in said tank and supplied with pressurized air for atomizing said oil and means admitting secondary air into said tank for adjusting the concentration of the atomized oil.
5. The apparatus according to claim 1 wherein said powder of protective metal is aluminum powder.
6. The apparatus according to claim 5 wherein said means for electrostatically applying said small quantity of oil applies a quantity per unit area of said oil onto the surfaces of said rolls ranging from 5 to 50mg/m2.
7. The apparatus according to claim 1 wherein said nozzle comprises a double-walled nozzle.
8. The apparatus according to claim 1 wherein said means for varying the quantity of oil applied onto said rolls includes means for varying the secondary air flow while maintaining the pressure of the primary or atomizing air at a predetermined value.
9. The apparatus according to claim 1 wherein said means for electrostatically applying said small quantity of oil applies a quantity per unit area of said oil onto the surfaces of said rolls ranging from 5 to 50mg/m2.
US00384384A 1971-06-16 1973-07-31 Apparatus for manufacturing steel sheets with layers of protective metal Expired - Lifetime US3845539A (en)

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JP46042498A JPS5035019B1 (en) 1971-06-16 1971-06-16
US25928772A 1972-06-02 1972-06-02
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584859A (en) * 1985-08-23 1986-04-29 Weirton Steel Corporation In-line control during draw-redraw of one-piece sheet metal can bodies
US11370008B2 (en) * 2016-08-18 2022-06-28 Primetals Technologies Austria GmbH Stripping device for a roll stand

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1634258A (en) * 1926-03-08 1927-07-05 Seymour Mfg Co Apparatus for rolling metal
US2107541A (en) * 1934-09-06 1938-02-08 American Rolling Mill Co Wiping device for rolling mill rolls
US2190237A (en) * 1937-12-30 1940-02-13 Gen Motors Corp Method of making a composite metal structure
US2290734A (en) * 1940-02-14 1942-07-21 Minerals And Metals Corp Manufacture of metal products
US2764508A (en) * 1953-07-29 1956-09-25 United States Steel Corp Electrostatic strip-oiling method and apparatus
US3478843A (en) * 1968-06-06 1969-11-18 Daystar Corp Mist type coolant spray unit
US3648497A (en) * 1970-02-18 1972-03-14 United States Steel Corp Apparatus for automatically supplying oil to a hot strip mill
US3661612A (en) * 1967-12-14 1972-05-09 Summers & Sons Ltd John Method of coating a moving metal strip

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1634258A (en) * 1926-03-08 1927-07-05 Seymour Mfg Co Apparatus for rolling metal
US2107541A (en) * 1934-09-06 1938-02-08 American Rolling Mill Co Wiping device for rolling mill rolls
US2190237A (en) * 1937-12-30 1940-02-13 Gen Motors Corp Method of making a composite metal structure
US2290734A (en) * 1940-02-14 1942-07-21 Minerals And Metals Corp Manufacture of metal products
US2764508A (en) * 1953-07-29 1956-09-25 United States Steel Corp Electrostatic strip-oiling method and apparatus
US3661612A (en) * 1967-12-14 1972-05-09 Summers & Sons Ltd John Method of coating a moving metal strip
US3478843A (en) * 1968-06-06 1969-11-18 Daystar Corp Mist type coolant spray unit
US3648497A (en) * 1970-02-18 1972-03-14 United States Steel Corp Apparatus for automatically supplying oil to a hot strip mill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584859A (en) * 1985-08-23 1986-04-29 Weirton Steel Corporation In-line control during draw-redraw of one-piece sheet metal can bodies
US11370008B2 (en) * 2016-08-18 2022-06-28 Primetals Technologies Austria GmbH Stripping device for a roll stand

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