EP0342408B1 - Rolling method and rolling machine - Google Patents

Rolling method and rolling machine Download PDF

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Publication number
EP0342408B1
EP0342408B1 EP89107705A EP89107705A EP0342408B1 EP 0342408 B1 EP0342408 B1 EP 0342408B1 EP 89107705 A EP89107705 A EP 89107705A EP 89107705 A EP89107705 A EP 89107705A EP 0342408 B1 EP0342408 B1 EP 0342408B1
Authority
EP
European Patent Office
Prior art keywords
rolling
recesses
workpiece
band plate
fluid
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
EP89107705A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0342408A1 (en
Inventor
Yoshiki Hiroshima Mach. Works Mitsubishi Mito
Hiroshi Hiroshima Mach. Works Mitsubishi Aratani
Kazuo Hiroshima Mach. Works Mitsubishi Morimoto
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0342408A1 publication Critical patent/EP0342408A1/en
Application granted granted Critical
Publication of EP0342408B1 publication Critical patent/EP0342408B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • 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
    • B21B27/005—Rolls with a roughened or textured surface; Methods for making same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0242—Lubricants

Definitions

  • This invention relates to a method and a machine for rolling metal plate, shape steel, bar steel, etc. made of steel, aluminum and the like with a reduced coefficient of friction.
  • a hot strip mill is used in case of hot rolling, or a tandem cold mill is used in case of cold rolling, for example.
  • the band plate is rolled thin by putting it between a pair of upper and lower rotating work rolls.
  • fluid such as a rolling lubricating agent was supplied to the surface of the work roll to decrease a load devoted to causing plastic deformation.
  • the lubricating agent is effective in preventing the generation of abrasion of the work roll and of flaws in the surface of a workpiece to be rolled.
  • the rolled band plate has surface irregularity in the widthwise direction, such as local projection or high spot, defective shape, and zigzag pattern.
  • DE-C-635220 discloses a method according to the pre-characterising part of claim 1 to mechanically or chemically pretreat a workpiece in order to obtain a roughened surface. Thereafter, the workpiece is covered with a liquid containing solid and/or organic compounds. After a drying period of approximately 15 minutes, a solidified coating covers the workpiece. The compounds or particles contained in the liquid are supposed to intrude into the rough surface of the workpiece and to provide an intimate contact with the surface that cannot be wiped off too easily. After this coating of the workpiece, it is cold rolled.
  • US-A-1.490.944 discloses a hot rolling mill according to the pre-characterising part of claim 2 having a rough-rolling section and a smooth rolling section.
  • pockets are formed into the surface of the workpiece which is washed with water beneath the pocket-forming roll.
  • the above described rolling method is characterized by the steps of claim 1.
  • a large number of recesses are formed in the surface of a workpiece to be rolled by the recess impressing unit provided on the inlet side of the rolling mill, then, at the time of rolling the workpiece by the rolling mill, a lubricating fluid is retained and confined in the recesses, and when the workpiece is pressed, the lubricating fluid thus confined is expanded thin to form a boundary film.
  • the recesses disappear as the rolling of the workpiece progresses, and the surface of the workpiece after the rolling becomes smooth.
  • Fig. 1 is a schematic view of a rolling machine according to a preferred embodiment of the present invention
  • Fig. 2 is an enlarged view of an important portion of the rolling machine.
  • the rolling machine 10 comprises a rolling mill 11 for rolling a band plate M, and a recess impressing unit 13 for forming recesses 12 in both sides of the band plate M on the inlet side of the rolling mill 11.
  • the rolling mill 11 includes upper and lower work rolls 14 and 15 for rolling the band plate M, and backup rolls 16 and 17 rotatable in contact with the upper and lower work rolls 14 and 15 to bear the reaction thereof, these individual rolls being rotatably supported by a housing 18.
  • Nozzles 19 and 20 are provided on the inlet side of the band plate M in relation to the work rolls 14 and 15 to spray a lubricating fluid L to individual contacting portions of the band plate M with the work rolls 14 and 15.
  • the recess impressing unit 13 provided on the upstream side of the rolling mill 11 includes a pair of projection-provided pinch rolls 22 and 23 having a large number of projections 21 as shown in Fig. 3, these pinch rolls being rotatably supported by a housing 24 so as to pinch the band plate M being fed.
  • the curvature of the recess 12 formed by the projection 21 is made larger than that of the work roll 14, but the shape of the recess 12 may take any form if it can be pressed completely flat at the time of rolling.
  • the pinch rolls 22 and 23 pinch the band plate M at a pressure enough for the recess 12 to be formed by the corresponding projection 21 by virtue of the plastic deformation of the band plate M being fed.
  • the fluid adhering to the surfaces of the work rolls 14 and 15 is introduced into the recesses 12 as the work rolls 14 and 15 rotate. Then, when the rolling progresses, the fluid L confined in the recesses 12 forms a boundary film over the contacting portions between the work rolls 14 and 15 and the band plate M because the recesses 12 are gradually expanded thin and flat within the contacting arc region. Since due to the formation of the boundary film the fluid L largely remains in the contacting arc region at the time of the band plate M being rolled in contrast with the prior art, the abrasion of the roll is reduced.
  • the amount of the fluid L being sprayed is sufficient if it is confined in the recesses 12 to remain therein enough, thus, the consumption of the fluid L can be decreased remarkably compared with the prior art.
  • the recesses 12 may be formed through pressing or cutting.
  • ⁇ a ⁇ b + ( 1 - a ) ⁇ f
  • ⁇ b ( ⁇ P) boundary friction zone
  • ⁇ the coefficient of boundary friction
  • P the bearing pressure of the roll
  • ⁇ the viscosity of the fluid
  • u the speed of the fluid
  • h the thickness of the fluid
  • a the area ratio of the boundary friction zone.
  • the present invention to decrease the area ratio a , a large number of recesses 12 are formed in the surface of the band plate M before rolling, and the rolling is performed while confining the fluid L in the recesses 12. Therefore, the value of the area ratio a can be arbitrarily controlled by confining the fluid L in the recesses 12 formed in the band plate M.
  • the fluid lubrication effect can be enhanced only by confining a small amount of fluid L in the recesses 12.
  • the lubricating fluid used in the present invention there is water.
  • the present invention can reduce the coefficient of friction in cold rolling of the band plate M.
  • the band plate was an Al plate of 10mm thick, which was rolled at room temperature using a rolling mill having work rolls of 200mm diameter.
  • the lubricating agent was water, and the Al plate was machined to have recesses of 3mm diameter arranged at a pitch of 3mm.
  • a reference workpiece was an Al plate having no recess, which was similarly subjected to testing.
  • Fig. 5 shows the result of the test. As shown in Fig. 5, the rolling load was reduced in accordance with the present invention by about 20% to 40% compared with the reference workpiece having no recess, this exhibiting the effectiveness of the present invention.
  • the rolling load can be significantly reduced compared with the prior art; consequently, the individual components of the rolling mill, such as the backup rolls and housing for supporting the work rolls, can be made compact, allowing the rolling mill to be manufactured at low costs.
  • the present invention can reduce the coefficient of friction of the workpiece at the time of rolling and provide a large reduction ratio even if the rolling load is kept very small. Further, the surface roughness and abrasion of the rolling roll are reduced, the fluid serves effectively as an adiabatic agent, and the heat resistance of the roll is enhanced. In addition, with the rolling load reduced, the rolling mill can be made compact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP89107705A 1988-05-18 1989-04-27 Rolling method and rolling machine Expired - Lifetime EP0342408B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63119313A JP2563478B2 (ja) 1988-05-18 1988-05-18 熱間圧延方法及び熱間圧延装置
JP119313/88 1988-05-18

Publications (2)

Publication Number Publication Date
EP0342408A1 EP0342408A1 (en) 1989-11-23
EP0342408B1 true EP0342408B1 (en) 1993-08-11

Family

ID=14758351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107705A Expired - Lifetime EP0342408B1 (en) 1988-05-18 1989-04-27 Rolling method and rolling machine

Country Status (6)

Country Link
EP (1) EP0342408B1 (zh)
JP (1) JP2563478B2 (zh)
KR (1) KR930008326B1 (zh)
CN (1) CN1020552C (zh)
BR (1) BR8902304A (zh)
DE (1) DE68908264T2 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2757089C2 (ru) * 2017-01-13 2021-10-11 Ман Трак Унд Бас Аг Резервуар смазочного средства для гидравлической системы

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5025547A (en) * 1990-05-07 1991-06-25 Aluminum Company Of America Method of providing textures on material by rolling
DE19744503A1 (de) * 1997-10-09 1999-04-15 Schloemann Siemag Ag Vorrichtung und Verfahren zur Beeinflussung der Reibungsverhältnisse zwischen einer oberen und einer unteren Walze eines Walzgerüstes
CN113210433A (zh) * 2021-04-28 2021-08-06 太原理工大学 一种优化金属极薄带表面微结构的方法
CN113210432A (zh) * 2021-04-28 2021-08-06 太原理工大学 一种改善波纹辊轧制金属板材表面质量的润滑工艺方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1490944A (en) * 1922-11-25 1924-04-22 Alan Wood Iron & Steel Company Metal rolling
DE635220C (de) * 1932-01-01 1936-09-12 C T Petzold & Co Verfahren zum Vorbereiten von Metallwerkstuecken fuer eine in Stufen auszufuehrende mechanische Bearbeitung
US1960958A (en) * 1932-03-17 1934-05-29 Sharon Steel Hoop Company Method of cold rolling steel strips and product thereof
US2361039A (en) * 1939-10-13 1944-10-24 Chicago Metallic Mfg Company Method of producing stippled sheet metal
FR2290623A1 (fr) * 1974-11-06 1976-06-04 Lorraine Laminage Tole pour emboutissage profond ou extraprofond et procede d'obtention d'une telle tole
WO1982003575A1 (en) * 1981-04-16 1982-10-28 Philip O Badger Implantation of molybdenum disulfide into certain metallic surfaces by mechanical inclusion
JPS62158504A (ja) * 1986-01-07 1987-07-14 Sumitomo Metal Ind Ltd 金属帯の冷間圧延方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2757089C2 (ru) * 2017-01-13 2021-10-11 Ман Трак Унд Бас Аг Резервуар смазочного средства для гидравлической системы

Also Published As

Publication number Publication date
EP0342408A1 (en) 1989-11-23
JP2563478B2 (ja) 1996-12-11
BR8902304A (pt) 1990-01-09
CN1020552C (zh) 1993-05-12
DE68908264D1 (de) 1993-09-16
KR900017674A (ko) 1990-12-19
JPH01289503A (ja) 1989-11-21
KR930008326B1 (ko) 1993-08-30
DE68908264T2 (de) 1993-12-16
CN1038601A (zh) 1990-01-10

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