US2593460A - Method of producing metal sheets - Google Patents

Method of producing metal sheets Download PDF

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Publication number
US2593460A
US2593460A US2593460DA US2593460A US 2593460 A US2593460 A US 2593460A US 2593460D A US2593460D A US 2593460DA US 2593460 A US2593460 A US 2593460A
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United States
Prior art keywords
sheets
rolling
plates
pack
ingots
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Expired - Lifetime
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    • 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
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/007—Taper rolling, e.g. leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/30—Foil or other thin sheet-metal making or treating
    • Y10T29/301—Method
    • Y10T29/303—Method with assembling or disassembling of a pack
    • Y10T29/305—Method with assembling or disassembling of a pack including bond prevention treatment

Definitions

  • This invention relates to metal working, and more particularly to the formation of metal sheets or plates by pack rolling. Whilethe invention is directed particularly to the formation of steel sheets or plates, it is applicable generally to metals or alloys from which ingots may be formed.
  • the pack rolling principle i. e. the simultaneous rolling of a plurality of metal members arranged-in a stack or pack has been used to roll thin steel sheets from rectangular sheet bars generally not over one inch thick. As these bars are spread by hot rolling, they are arranged in packs and as these packs are further reduced in thickness they are folded over to combine four and finally eight sheets. The total reduction in thickness is relatively light and the rolling temperature is kept below 2000 F. so that the individual sheets will not weld together. Sticking together is also prevented by the thin coating of iron oxide which forms on the surface as thehot sheets are individually exposed to the air.
  • One object of the present invention is the provision of a novel method of forming metal sheets abrasive which exercises a hot grinding and pol ishing effect on the confronting faces of the ingots as they are rolled, thus providing a smooth commercial finish on the saidfaces of the finished plates.
  • Another object of this invention is to enable a plate mill to roll light plates to greater widths and longer lengths than was previously possible; also to enable a plate mill to produce thin sheets direct from ingots which heretofore has not been possible. For example, an order for 1000 plates x 60" x A thick, that would normally be rolled from 84 single ingots each weighing 4000#, can be rolled from only 28 ingot packs each weighing 12,800# because the mill can roll them to thick in wider multiple widths and longer multiple lengths than is possible at A" thick.
  • the ingot pack Following the formation of the ingot pack, as shown in Fig. 1, it is heated to a suitable temperature for hot rolling, e. g. 2300 F., and itis then rolled until the desired individual sheet or plate thickness is attained.
  • Fig. shows the pack at an intermediate stage of the rolling operation. After the rolling is completed, the sheets or plates are separated by shearing normal amounts of end and side scrap which removes all weld metal holding the sheets together.
  • Figs. 6 and '7 illustrate the character of the opposite faces of a finished sheet formed in accordance with the present invention and employing .a parting compound of the character above mentioned.
  • the illustrations of these figures were taken from an actual sample and are truly representative of the character of the surfaces produced.
  • the surface I5 shown in Fig. 6 is the outer surface of the sheet which was engaged by the rolls during the hot rolling operation, while the surface I6 shown in Fig. 7 is the inner surface which was engaged by the parting compound. While the surface [5 is much smoother than the extremely rough surfaceof the ingot from which the sheet was formed, it is not nearly as smooth as the surface I6 which requires no treatment, such as pickling or sand blasting, by the fabricator. This smooth surface is produced by the hot grinding and polishing action of the combined parting compound as previously mentioned.
  • the sample fromwhich the illustrations of Figs. 6 and 7 were taken is a steel sheet which was produced by ingot pack rolling employing the magnesium oxide parting compound above mentioned.
  • the relative hardness of the compound at the rolling temperature has a great deal to do with the smoothness of the finished plate or sheet surface. Since the invention is primarily concerned with the rolling of steel plates or sheets, and the rolling is preferably done at a temperature starting at 2200-2500 F. and finishing at 1400-1800 F., the relative hardness of the parting compound within the overall temperature range indicated is important.
  • the high starting temperature of 2200-2500 F. is sufficiently high to permit the desired pack rolling and is also sufficiently high to effect the chemical reaction between the parting material and the metallic oxide usually present on the confronting faces of the ingots.
  • the parting compound is slightly plastic, and is neither too plastic nor too hard, at the final rolling temperature. If the parting compound is too plastic, it will cause the plates or sheets to stick together, making it difficult or impossible to part them. On the other hand, if the parting compound is too hard, it leaves the surfaces of the plates or sheets undesirably rough.
  • the specific compounds mentioned above have been found to have the desired characteristics for rolling steel plates or sheets in accordance with the invention.
  • the invention is not limited to the rolling of plates or sheets of uniform thickness but may be applied to the rolling of plates or sheets of varying thickness.
  • the invention may be applied to the rolling of tapered plates or sheets as illustrated in Figs. 8 to 11.
  • the rough ingots may be cast in shapes which will give the desired varying thickness of the plates or sheets after rolling.
  • Fig. 8 there is shown an assembled pack comprising a pair of tapered ingots I! and I8 and a parting sheet l9 therebetween. The ingots are arranged so that the assembled pack is in the form of a parallelopiped.
  • Fig. 9 is a cross-sectional view of the assembled pack.
  • the compressible weld dams previously mentioned are shown at 20, and the weld metal is indicated at 2 I.
  • Fig. 10 shows the pack after it has been subjected to some rolling, while Fig. 11 shows one of the finished tapered plates or sheets.
  • the general method contemplated by the present invention may be performed in some instances by applying the parting compound as a thick paint to the rough surfaces of one or both of the ingots which are to be brought into confronting relationship. Therefore, the general method of the invention is not limited to the use of a composite parting sheet.
  • the invention contemplates broadly-the pack rolling of rough ingots, employing a parting compound which is not only effective to prevent welding adhesion of the ingots but also exercises a hot grinding and polishing action on the confronting faces of the ingots during the hot rolling operation.
  • the invention further contemplates the use of a parting compound which imparts the desired dark brown or black color to the inner faces of the pack-rolled plates or sheets.
  • the method of producing metal plates or sheets from relatively rough and thick members such as ingots which comprises: assembling a plurality of said members in a pack for rolling in which the confronting faces of the members are separated by a parting compound which will prevent welding adhesion of said confronting faces and which will chemically react at high rolling temperatures with the metallic oxide usually present on said confronting faces to form an abrasive; heating the pack to a high temperature sufficient to permit hot rolling of the pack and'to effect the chemical reaction between the parting compound and the metallic oxide to form the abrasive; rolling the highly heated pack to reduce the members to the desired plate or sheet thickness, the abrasive between the confronting faces of said members being moved relative to saidfeonfrontingifaces during 'such mnmg to er-K fect a grindingand polishingaction thereon; and separating the formed plates or sheets from'the wh w V- y 2.
  • the method of producing metal plates or sheets which comprises assembling a pair of roughingots inan edge welded pack with a part-' ing material therebetween'consisting of a base; sheet fhavingfsuflicient flexibility to conform it self to 'thejrough confronting faces'ofthe ingots and a partin'g 'm;ateria1 carried on saidbase sheet, saidjiparting material preventing welding adhe'sion of said'confronting faces and chemically reacting at rolling temperatures of the order of 22 0( 25 00 F, with the metallic oxide usually prs'entfon fsa'id confronting faces to form an abrasive; heating the pack'at a temperat'ure'of the order of 2200-2500 F.
  • the method of producing tapered mean plates or sheets which comprises: forming relatively 'roughand thick tapered memberasuch as ingots, capable of assembly in a parallelopiped the metallic oxide to form the'abrasivej rolling" the highly"heated pack to reduce the members to "the desired plate or'sheet thickness, the abrasive between the confronting faces of said members being moved 'relativeto said confronting faces during such rolling to'effect a grinding and polishing action thereonyand separating the formedpl'ates or sheets'from the pack.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Metal Rolling (AREA)
US2593460D Method of producing metal sheets Expired - Lifetime US2593460A (en)

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US2593460TA

Publications (1)

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US2593460A true US2593460A (en) 1952-04-22

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US2593460D Expired - Lifetime US2593460A (en) Method of producing metal sheets

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NL (1) NL73702C (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711966A (en) * 1949-12-01 1955-06-28 Lukens Steel Co Parting composition
US2742076A (en) * 1952-01-28 1956-04-17 Douglas Aircraft Co Inc Method of stretching tapered sheets
US2835022A (en) * 1955-02-08 1958-05-20 Jessop Steel Company Process of making metal product
US3114202A (en) * 1960-03-24 1963-12-17 Olin Mathieson Method of pressure welding metal sheets
US3122423A (en) * 1960-04-04 1964-02-25 Beryllium Corp Method and apparatus for hot rolling high quality metal sheet
US3191291A (en) * 1959-01-21 1965-06-29 Continental Can Co Art of producing very thin steel and like sheets in wide strips
US3269007A (en) * 1960-11-21 1966-08-30 Continental Can Co Method of restoring ductility to heavily cold worked sheet metal
US3371399A (en) * 1964-08-17 1968-03-05 Texas Instruments Inc Method of making inflated metal products
EP0374094A1 (de) * 1988-12-14 1990-06-20 GebràœDer Sulzer Aktiengesellschaft Verfahren zum Verformen eines Metallstückes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711966A (en) * 1949-12-01 1955-06-28 Lukens Steel Co Parting composition
US2742076A (en) * 1952-01-28 1956-04-17 Douglas Aircraft Co Inc Method of stretching tapered sheets
US2835022A (en) * 1955-02-08 1958-05-20 Jessop Steel Company Process of making metal product
US3191291A (en) * 1959-01-21 1965-06-29 Continental Can Co Art of producing very thin steel and like sheets in wide strips
US3114202A (en) * 1960-03-24 1963-12-17 Olin Mathieson Method of pressure welding metal sheets
US3122423A (en) * 1960-04-04 1964-02-25 Beryllium Corp Method and apparatus for hot rolling high quality metal sheet
US3269007A (en) * 1960-11-21 1966-08-30 Continental Can Co Method of restoring ductility to heavily cold worked sheet metal
US3371399A (en) * 1964-08-17 1968-03-05 Texas Instruments Inc Method of making inflated metal products
EP0374094A1 (de) * 1988-12-14 1990-06-20 GebràœDer Sulzer Aktiengesellschaft Verfahren zum Verformen eines Metallstückes

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Publication number Publication date
NL73702C (ja)

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