US2526296A - Method and apparatus for processing strip metal - Google Patents

Method and apparatus for processing strip metal Download PDF

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US2526296A
US2526296A US498389A US49838943A US2526296A US 2526296 A US2526296 A US 2526296A US 498389 A US498389 A US 498389A US 49838943 A US49838943 A US 49838943A US 2526296 A US2526296 A US 2526296A
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strip
rolls
roll
drag
pull
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US498389A
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Morris D Stone
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United Engineering and Foundry Co
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United Engineering and Foundry Co
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Priority to US498389A priority Critical patent/US2526296A/en
Priority to GB9469/44A priority patent/GB585165A/en
Priority to CH254593D priority patent/CH254593A/fr
Priority to FR922283D priority patent/FR922283A/fr
Priority to DEP29433A priority patent/DE921502C/de
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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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/222—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 plates, strips, bands or sheets of indefinite length in a rolling-drawing process; in a multi-pass mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/12—Toothed-wheel gearings specially adapted for metal-rolling mills; Housings or mountings therefor

Definitions

  • the invention relates to methods of and mills for processing strips of elastic metal, such as steel, aluminum and copper, whose temper or hardness may be increased by cold stretching the metal beyond its yield point.
  • elastic metal such as steel, aluminum and copper
  • the typ of strip metal here contemplated is that which is relativelywide and thin when compared with what is known as fiat-wire or banding.
  • the invention may advantageously be used in the tension processing of non-ferrous strip metal of the character and type stated, it is particularly applicable to the tempering of strip steel, with reference to which it is herein primarily described.
  • a necessary final production step is tempering the metal to specified hardness, drawability, etc.
  • the normal production cycle for tin plate is hot rollin pickling, cold rolling to reduce the metal, cleaning, annealing, and tempering which is done by cold rolling.
  • temper rolling the operating conditions are such that only relatively small reduction can be made, one reason for this being that the metal is then quite thin and diflicult to reduce, and the other being that, to avoid staining the metal and interfering with subsequent tinning and other coating, temper rolling is done without the benefit of rolling oil or coolants which are used to facilitate the cold rolling that follows hot rolling.
  • temper rolling Although the percentage reductions in temper rolling are not greater than about ten per cent for maximum hardness, it is practically impossible with present equipment to take such a reduction in a single pass, even although such pass be through a heavy-duty four-high mill with front and back tension applied to the strip. Both the rolling pressures as measured-in pounds per unit of width of. strip, and the rolling energy as indicated by horsepower hours per'ton are materially higher for the normal temper rolling operations than for either hot rolling or cold reducing rolling comparable reductions, or in some instances for far greater reductions. Thus, temering by rolling is a very difilcult and expensive procedure.
  • a further disadvantage of tempering steel by rolling is that the ductility and the attending drawability of the metal decreases materially as the temper hardness is increased. Because of this reduction in ductilityin the tin can industry it is now common practice to specify a "hard tin '11 Claims. '(crso-es) plate for can bodies to provide the necessary a strength to avoid fiuting in the formation of the bodies and to .eliminate bulging due to internal gas pressures, and to specify a soft tin pla for can tops which are relatively deep drawn in their formation but whose strength is not of such great importance as that of the bodies. Furthermore, in the shaping and particularly the crimpin of can bodies made from tin plate it is usually necessary to take into consideration the direction of orientation of the grains resulting from the temper rolling of the sheet metal.
  • One object of the invention is to provide a method of and mill for tempering strip metal at a low cost per ton, in a continuous fashion by stretching the strip beyond its yield point solely by tension progressively applied to the strip from end to end in variable amounts depending upon the temper desired; and a further object is by thus tempering strip metal, particularly strip steel, to improve the grain structure and physical characteristics of the resulting product to the end that it may readily be drawn or otherwise formed without impairment, and may be used as well for the tops as the bodies of tin cans and without regard to the direction of temper rolling.
  • slip lines disappear when such sheet metal is elongated beyond the aforesaid critical per cent, and they do not occur when the metal has, within a limited period which is not more than about two days for most steels, been preworked by a roller leveling operation, nor when it has been preworked by cold rolling, the efiect of which lasts for man;' weeks.
  • Such steps may be preworking by cold rolling with smooth or rough surfaced rolls immediately prior to tension tempering, or final rolling with smooth burnishing or with roughsurfaced rolls immediately following tension tempering, or both preworking and final ro1ling.
  • a further object of the invention is to provide a method of and mill for cold processing strip .metal whereby in a single operation and in a continuous fashion it may. be cold rolled to preclude the formation of stretcher strains or to roughen its surface or surfaces as desired, and then stretched beyond its yield point solely by tension progressively applied, and then burnished or roughened.
  • Fig. 1 is a diagrammatic end view of a group of rolls showing a strip of metal passing through them
  • Fig. 2 a :plan view of the portion of the strip passing through the rolls shown in Fig. 1, the narrowing of the width of the strip being somewhat exaggerated
  • Fig. 3 a somewhat diagrammatic vertical central sectional view of a mill equipped with rolls positioned and arranged as shown in Fig. 1, the view including tensioning and other accessories on the entering and delivery sides of the mill
  • Fig. 4 a somewhat diagrammatic side view of the delivery side of the mill shown in Fig. 3
  • Figs. 5 and 6 diagrammatic face views of mills equipped with rolls the same as shown in Figs. 3 and 4, illustrating modifications of roll drives: and Figs. 7, 8, 9 and 10 diagrammatic end views of mills showing alternative arrangements of rolls.
  • a strip of metal which is wide with relation to its thickness is progressively tensioned beyond its yield point by wrapping the strip partially around parallel drag and pull rolls frictionally to engage a relatively large portion of the face of each, a portion of the strip between these rolls being free from engagement with them.
  • this may be done by wrapping a strip S partially around a drag roll D and a pull roll P which are so spaced from each other that there is a gap between their adjacent faces in which the strip is free from engagement with the rolls.
  • the pull roll is driven at a peripheral speed greater than that of the drag roll progressively to stretch beyond its yield point the portion of the strip that moves continuously from the drag to the pull roll.
  • such driving of the drag and pull rolls may be effected by separate motors which are controlled by suitable electric equipment to the end that the motor connected to the drag roll acts during the tensionstretching of the strip as a regenerative brake of predetermined known eifectiveness with relation to the nected to it.
  • the drag and pull rolls may be positively geared to each other to effect a desired difference in the peripheral speeds of the rolls to perform the tension stretching operation, different gear ratios being substituted for other desired tensioning operations, or the drag and pull rolls may be coupled together by a differential gear mechanism that is suitably driven and controlled by diiferent motors.
  • a portion of the strip that moves continuously from drag roll D to pull roll P is in the plastic state induced by the tensioning of it, and the portions of the strip immediately adjoining that which is in the plastic state are in the elastic state, as both such states are defined above.
  • the unsupported length of the strip between its point of tangency T with drag roll D and its point of tangency T with the pull roll P is in the plastic state which is induced by its being tensioned materially beyond its yield point, such portion having no frictional force resisting its tensioning. From the line of tangency T elongation of the portion of the strip wrapped upon the drag roll is progressively resisted by frictional engagement of the strip with the roll,
  • the unsupported length of the plastic state portion of the strip between its lines of tangency T and T with rolls D and P, respectively, is made short enough with relation to the width of the strip to maintain the strip laterally stable and consequently free from longitudinal guttering. Because the Plastic state portions of the any tendency of such portions to gutter.
  • the unsupported length of the strip between its points of I tangency T and T should not be greater than two-thirds of the width of the strip to prevent guttering for all elongations of the strip that may be afiected up to its necking point, which is about atwenty per cent elongation.
  • the unsupported plastic state length should not be greater than the width of the strip, the length permissably increasing as the thickness increases.
  • the strips of any material the maximum length of the unsupported strip with relation to its width to maintain the strip laterally stable and consequently free from longitudinal guttering may be determined by progressively increasing such unsupported length until guttering occurs.
  • a strip being cold processed is preferably tensioned on both the entering and delivery sides of the mill.
  • a working ro l is preferably positioned above drag roll D to cooperate with it in cold rolling the strip.
  • Such cold rolling takes place at and immediatey adjacent to the meeting lines of rolls l and D, and while the strip is thus being cold rolled the metal thereof is in a more fluid state than it is before it enters and after it leaves the bite of the rolls.
  • the metal of the strip is in the elastic state in which'it remains until it reaches the yield point line Y explained above.
  • Such cold rolling of the str p precludes the formation of stretcher strains which appear when annealed plain low carbon strip steel is stretched by tension from about one to five per cent or more, as explained above.
  • rol s I and D may be provided with roughened faces, or if it is desired to roughen only one surface of the strip the face of one or the other of these rolls may be roughened. If the face of drag roll D is roughened, the friction between it and the strip is increased with the result that the yield point line Y may move in a counter-clockwise direction on roll D, or in other words, further from the bite of rolls l and D than indicated in Fig. 1.
  • a working roll 2 may be positioned below pull roll P to burnish the strip which is usually somewhat roughened when tensioned beyond its yield point, or the faces of rolls 2 and P may be roughened if it is desirable further to roughen the surfaces of the tensionstretched strip.
  • Fig. 2 there is showna face view of the portion of a strip being cold processed by the mill of Fig. 1, the strip being shown in flat form and its variations in width being exaggerated. On the strip there are shown in dot and dash lines the several successive stages in the processing of the strip, explained with reference to Fig. 1.
  • Unrestrained elongation of the strip takes place between the tangency lines T and 'I' where the strip is unsupported and is shown as being materially contracted in width at a uniform rate. Between the tangency line 'I' and the yield point line Y on roll P the strip is further narrowed, as it is between lines Y and T, but at a progressively diminishing rate. Until the strip enters the bite of the rolls 2 and P it is in the elastic state and is not permanently narrowed, and beyond R it is shown as being slightly widened due to spreading action of those rolls. As shown in Fig. 2, the length of the portion of the strip between tangency lines T and 'I is materially less than its width so that the strip is maintained laterally stable and consequently free from longitudinal guttering.
  • low carbon strip steel twentyeight inches in width and 0.01 inch in thickness may be elongated solely by tension in the manner explained with reference to Fig. 1 on a mill whose rolls are positioned as there shown by using rolls twenty-four inches in diameter, rolls D and P being spaced twenty-seven and one-half inches center to center.
  • the strip is elongated solely by tension applied to it beyond its yield point.
  • the portion of the strip betweenyield point lines Y and Y is in the plastic state, and
  • each end of this portion of the strip is adjoined by a portion in the elastic state.
  • additional drag and pull rolls may be used to increase the length of the strip wrapped upontheir faces so that there will be sufllcientfrictional engagement of the drag and pull rolls to maintain elastic state portions of the strip adjoining the plastic state portion. The use of such additional rolls will be explained in greater detail with reference to drawings of various mills that may be used.
  • strip steel that is tensiontempered according to this invention is superior to that tempered by cold rolling.
  • tin plate that is tempered by tension-stretching meets the non-fluting requirements of can bodies with a minimum of spring-back, and also meets the deep-drawing requirements of can tops.
  • strip that has been tension-tempered to a given hardness has materially greater ductility and attending drawability than a like strip that has been temper-rolled to the same hardness.
  • An important difference between tensiontempered strip and temper-rolled strip arises from the fact that the tension-tempered product is cold worked substantially uniformly throughout its thickness, which is not the case with temper-rolled strip.
  • the physical characteristics of the tension-tempered product strongly indicate that its grain structure has random as distinguished from preferred orientation.
  • tension-tempered strip This has been confirmed by a micro-examination of the grain structure of tension-tempered as compared to temper-rolled steel strip.
  • a further advantage of the properties of tension-tempered strip is that it can be used in making crimped-edge can bodies and the like without specific reference to the direction of the processing, which is not true with reference to temper-rolled steel.
  • a coil of annealed strip of rimmed steel stock .012 of an inch in thickness containing .09% carbon and .31% manganese had in its annealed state a Rockwell T hardness number of 50.7 and an Erickson value of 7'70. After being tension-tempered by stretching it four per cent it had a Rockwell T hardness number of 58.0 and an Erickson value of 570.
  • This coil of strip steel was preworked by cold rolling it in which the reduction was one-half of one per cent. After such cold rolling it had a Rockwell T hardness number of 53.3 and an Erickson value of 720.
  • Tin plate of T,l temper has a Rockwell T hardness number of from about 46 to 52, while that having a T6 temper has a like hardness number of from about 66 to '70.
  • the amount of stretch required in tension-tempering steel strip according to this invention varies according to the original hardness of the strip and also its chemical anaylsis, particularly its carbon content.
  • the mill shown in Figs. 3 and 4 is equipped with two pairs of rolls which are positioned and arranged the same as shown in Fig. 1. These are drag roll D and working roll I which cooperates with it, and pull roll P and working roll 2 which cooperates with it. These rolls are suitably mounted in a housing consisting of side frames I and II, a base I2, and a top I3.
  • the chocks which support the necks of rolls D and P' preferably position the axes of these rolls at a fixed distance from each other, while the chocks that support the necks of rolls I and 2 are movable vertically to vary the pass between each of them and the roll with which it cooperates.
  • the chocks of upper roll I may be pressed upwardly against a screw-down by suitable roll balances.
  • the screw-down mechanism generally indicated at the top of the side frame II of the housing may be constructed like that shown in Patent No. 1,776,444 to McBane and Kline, to which reference may be made.
  • the checks of lower roll 2 may be urged upwardly by like screw-down mechanism to vary the pass between rolls 2 and P.
  • Drag roll D and pull roll P are caused to operate at different relative speeds by separate electrical power units, roll D being shown in Fig. 4 as being coupled to such a unit in the form of a motor [5 and pull roll P being driven by a motor I6.
  • strip S is preferably tensioned at the entry side of the mill by a pair of rolls 20 and Zn, and is similarly tensioned at the delivery side of the mill by a pair of rolls 22 and 23, around which pairs of rolls the strip is wrapped as shown.
  • is preferably coupled to a separate motor for driving it while the end of a strip is being guided through the mill, such motors becoming regenerative brakes to add tension to the strip as it passes through the mill during a cold processing operation.
  • each of rolls 22 and 23 is preferably driven by a separate motor, first to feed the entering end of the strip forwardly and then to apply tension to the strip as it is delivered from the mill.
  • the strip may pass to tension rolls 20 and 2I from a suitable coil box or uncoiler 24, and beyond tensioning rolls 22 and 23 it may be coiled either tightly or loosely by a driven reel 29.
  • the tensioning of the strip at both the entering and delivery sides of the mill may be of the order of that similarly applied to strip metal when cold rolling it. Tensioning is necessary at the entering side of the mill if tension-stretching according to this invention is done without using roll I to exert pressure on the strip, as for example when there is no preworking of the strip between rolls I and D. Under similar operating conditions, tensionin is necessary at the delivery side of the mill.
  • an idle pressure roll 25 is positioned below tension roll 2
  • a stationary cylindrical guide 26- is positioned to cause the strip to bewrapped around roll 2
  • a horizontal guide for supporting the entering end of the strip as it passes from roll 20 to the bite of rolls I and D.
  • a roll 31 below the strip which, by a fluid pressure mechanism 33, may be moved from its dotted to its full line position after the leading end of a strip has been engaged by rolls 1 and D.
  • ispositioned on the delivery side of roll I adjacent to its face to cause the entering end of the strip to turn downwardly and be engaged by a cylindrically shaped guide 32 adjacent to roll D which causes the strip to be wrapped around such roll.
  • a guide 33 for causing the strip to be wrapped around roll P, such guide being preferably pivoted at its upper end and connected to the piston rod of a fluid pressure mechanism 36 to be wraDp d around it.
  • Above roll 20 I which may be actuated to move the guide outwardiy to its dotted line position after a strip has been directed around roll P.
  • strip has been passed through a mill like that shown in Figs. 3 and 4 at rates up to three thousand feet per minute, and higher speeds are considered entirely possible. It has been found that the rolls of the mill operate at much lower temperatures than the rolls of conventional temper mills whose delivery speeds are limited because coolants can not be used in temper rolling.
  • the heating of rolls in temper mills is caused primarily by deformation of the strip, friction between the rolls and the strip, and friction in the roll neck bearings. In the mill provided according to this invention the heat imparted to the rolls by these causes is approximately one-third of that imparted to the rolls of conventional temper mills.
  • Fig. 5 there is diagrammatically illustrated a mill equipped with pairs of rolls the same as that shown in Figs. 3 and 4 in which the drag and pulls P and D are driven by a single motor 40 through intermeshing gears 4
  • gears 4i and 42 By substitutinfi gears 4i and 42 of different ratios, different rein-'- tive peripheral speeds of rolls D and P may effected.
  • Fig. 6 there is diagrammatically illustrated another mill equipped with rolls the same as shown in Figs. 3 and 4, but in which rolls D and P are driven by a single motor 45 through a differential which may be controlled by another motor to effect any desired difference in the peripheral speeds of rolls D and P.
  • the drive shaft of motor 45 which is directly connected to pull roll P, is equipped with a beveled pinion 43 which meshes with a beveled pinion ill that is connected to the driving side of a differential 48.
  • the driven side of this difierential is connected by a shaft 43, beveled pinions 50 and 5
  • a motor 52 may be connected to the difierential variably to control the relative peripheral speeds of rolls D and P. In such a drive suitable controls for the two motors is required to obtain the desired results.
  • Fig. 7 there is diagrammatically illustrated a mill in which two drag and "two pull rolls are substituted for the single drag and pull rolls of the mill of Figs. 3 and 4.
  • the two drag rolls are indicated at D and D and the two pull rolls at P and P Positioned above roll D there is a working roll la, and positioned below pull roll P there is a working roll 20 corresponding, respec the strip is wrapped around pull rolls' P and P which are also spaced apart and driven at like peripheral speeds. beyond its yield point takesplace between drag roll D and pull roll P which are spaced apart as shown similar to the spacing of such rolls in the mill of Figs. 3 and 4.
  • These additional drag and pull rolls may be used to give greater frictional engagement of strips to augment the tension in the strip when needed.
  • the frictional engagement of the strip with the drag and pull rolls may also be increased by offsetting the rolls in the manner diagrammatically illustrated in Fig. 8, which shows a mill equipped with the same number of rolls as that of Fig. 7.
  • Fig. 8 drag rolls D and D are positioned in vertical alignment with work roll lb, and pull rolls P and P are positioned in vertical alignment with work roll 2b, but rolls P, P and 2b are offset laterally from the other rolls.
  • Such an arrangement affords additional surface wrapping of the strip on the faces of drag roll D and pull roll P, the elongation being effected between these rolls as in the other forms of mills, and also makes it possible to shorten the drag rolls D and D are positioned in vertical The tensioning of the strip a?
  • drag roll D and work roll Id are positioned in vertical alignment at one side, and pull roll P and work roll id in vertical alignment at the other side of a housing.
  • the pull and drag rolls being spaced laterally from each other a greater distance than in the mill shown in Fig. 9, an idle roll 55 is positioned below the strip between pull roll P and drag roll D to shorten the unsupported length of the plastic state portion of the strip between these rolls so that the strip may be maintained laterally stable and consequently free from longitudinal gutterins.
  • the important advantages of the invention are the improvement in product resulting from the practice of the method, as has been explained, and a greatly reduced cost of cold processing strip metal by tensioning as compared to cold rolling.
  • cost by one pass of strip steel through a single stand tension-tempering mill like that shown in Figs. 3 and 4 the strip may be given the highest temper now specified. This requires two or three passes through a temper rolling mill which involves much higher labor cost than a single pass through th tensioning-tempering mill.
  • the initial cost of a tension-tempering mill and its accessory equipment is about forty per cent of that of the usual two-stand temper-rolling mill andits accessory equipment, and is about two-thirds the cost of a single stand temperrolling mill and its accessory equipment.
  • a continuous mill for progressively tensioning beyond its yield point and while cold-a wide thin strip of metal, comprising a roll housing, a pair of cooperating work-reducing rolls mounted in said housing one of which is a drag roll, a
  • second pair of work-reducing rolls mounted in said housing in spaced relationship with said firstmentioned pair, one of said second pair being a pull roll; means for directing the strip in sequence between said first-named pair of rolls thereby to cold roll it, around a relatively large portion of the face of the drag roll thereof frictionally to engage it, around a relatively large portion of the face of said pull roll of said secand pair of rolls frictionally to engage it, and
  • a continuous mill for progressively tensioning beyond its yield point and while cold a wide thin strip of metal comprising a roll housing, a pair of cooperating work-reducing rolls mounted in said housing one of which is a drag roll, a, screw-down at the top of the housing for controlling and adjusting the pass between said pair of rolls, a second pair of workreducing rolls mounted in said housing in spaced relationship with said first-mentioned pair one of said second pair being a pull roll, a screw-down at the bottom of the housing for controlling and adjusting the pass between said second pair of rolls; means for directing the strip in sequence between said first-named pair of rolls, around a relatively large portion of the face of the drag roll thereof, around a relatively large portion of the face of said pull roll of stretch solely by tension beyond its yield point.
  • a mill for progressively tensioning beyond its yield point and while cold a wide thin strip of metal comprising a roll housing, a pair of vertically-aligned cooperating working rolls mounted in said housing one of which is a drag roll, a screw-down for controlling and adjusting the pass between said pair of rolls, a second pair of vertically-aligned working rolls mounted in said housing in spaced relationship with said first-mentioned pair and in vertical alignment therewith, one of said second pair being a pull roll; guide means for directing the strip in sequence between said first-named pair of rolls thereby to cold roll it, around a relatively large portion of the face of the drag roll thereof frictionally to engage it, around a relatively large portion of the face of said pull roll of said second pair of rolls frictionally to engage it, and
  • a continuous mill for progressively tensioning beyond its yield point and while cold a wide thin strip of metal comprising a pair of cooperating work-reducing rolls one of which is a drag roll, a second pair of work-reducing rolls mounted in spaced relationship with said firstmentioned pair, one of said second pair being a pull roll: guides for directing the leading end of a strip in sequence between said first-named pair of rolls, around a relatively large portion of the face of the drag roll thereof, around a relativel large portion of the face of said pull roll of said second pair of rolls, and between said second pair of rolls; the guide for directing the strip around said pull roll being movable laterally of the pull roll to a non-guiding position during the tension stretching of the strip; and means for driving said pull roll at a peripheral speed materially greater than that of said drag roll progressively to stretch solely by tension beyond its yield point the portion of the strip that moves continuously from said drag to said pull roll.
  • a mill for progressively tensioning beyond its yield point and while cold a wide thin strip of metal comprising a roll housingfa pair of vertically-aligned cooperating working rolls mounted i said housing one of which is a drag roll, a second pair of vertically-aligned cooperating working rolls mounted in said housing in spaced relationship with said first-mentioned pair, one of said second pair being a pull roll; guides for directing the strip in sequence between said first-mentioned pair of rolls, around a relatively large portion of the face of the drag roll thereof, around a relatively large portion of the face of said pull roll of said second pair of rolls, and between said second pair .of rolls; means for driving said pull roll at a peripheral speed materially greater than that of said drag roll progressively to stretch solely by tension beyond its yield point the portion of the strip that moves continuously from said drag to said pull roll; and means for tensioning the strip below its yield point as it enters said first-men'- tioned pair of rolls and as it is delivered from said second pair of rolls.
  • a continuous mill for progressively tensioning beyond its yield point and while at a cold-working temperature a wide thin strip of metal comprising a pair of cooperating workreducing rolls one of which is a drag roll, a second pair of work-reducing rolls in closely spaced relationship with said first-mentioned pair, one oi said second pair being a pull roll; means for directing the strip in sequence between said first-named pair of rolls, around a relatively large portion of the face of the drag roll thereof, around a relatively large portion of the face of said pull roll of said second pair of rolls, and between said second pair of rolls; and means for driving said pull roll at a pre-determined speed materially greater than that of said drag roll progressively to stretch solely by tension beyond itsyield point the portion of the strip that moves continuously from said drag to said pull roll.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US498389A 1943-08-12 1943-08-12 Method and apparatus for processing strip metal Expired - Lifetime US2526296A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US498389A US2526296A (en) 1943-08-12 1943-08-12 Method and apparatus for processing strip metal
GB9469/44A GB585165A (en) 1943-08-12 1944-05-17 Improvements in or relating to cold processing strip metal
CH254593D CH254593A (fr) 1943-08-12 1945-06-07 Procédé continu pour le traitement à froid d'une large bande de métal mince et laminoir pour la mise en oeuvre de ce procédé.
FR922283D FR922283A (fr) 1943-08-12 1945-09-14 Perfectionnements au procédé et à l'appareil destinés à traiter du métal en bandes
DEP29433A DE921502C (de) 1943-08-12 1949-01-01 Verfahren und Walzwerk zur Herstellung von Metallband

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US498389A US2526296A (en) 1943-08-12 1943-08-12 Method and apparatus for processing strip metal

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US2526296A true US2526296A (en) 1950-10-17

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US (1) US2526296A (fr)
CH (1) CH254593A (fr)
DE (1) DE921502C (fr)
FR (1) FR922283A (fr)
GB (1) GB585165A (fr)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136184A (en) * 1961-03-15 1964-06-09 Nat Steel Corp Method and apparatus for the treatment of cold rolled metal strip
US3238756A (en) * 1961-05-03 1966-03-08 Gen Electric Material forming method and apparatus
US3245244A (en) * 1963-08-07 1966-04-12 Natalis H Polakowski Mechanism for flattening metal strip
US3253445A (en) * 1962-07-09 1966-05-31 Metal Box Co Ltd Apparatus for rolling strip metal
US3332292A (en) * 1965-04-07 1967-07-25 United States Steel Corp Method and apparatus for rolling strip
US3362202A (en) * 1964-07-03 1968-01-09 Loire Atel Forges Strip tensioning apparatus
US3374653A (en) * 1965-05-28 1968-03-26 Kaiser Aluminium Chem Corp Strip leveling apparatus
US3377830A (en) * 1965-06-18 1968-04-16 United States Steel Corp Method and apparatus for reducing strip
US3394574A (en) * 1965-04-02 1968-07-30 Metal Box Co Ltd Treatment of strip metal
US3394577A (en) * 1965-05-19 1968-07-30 Textron Inc Rolling mill
US3709017A (en) * 1969-06-26 1973-01-09 V Vydrin Method of rolling metal sheet articles between the driven rolls of the roll mill
US3811307A (en) * 1971-06-28 1974-05-21 V Sosjurko Method of rolling metal sheet articles
US3871221A (en) * 1972-12-01 1975-03-18 Vladimir Nikolaevich Vydrin Continuous strip rolling mill
US3889505A (en) * 1973-02-07 1975-06-17 Ungerer Irma Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations
US4244203A (en) * 1979-03-29 1981-01-13 Olin Corporation Cooperative rolling process and apparatus
US4291562A (en) * 1979-09-20 1981-09-29 Orr Howard S Three roll tension stand
US4412439A (en) * 1981-05-04 1983-11-01 Olin Corporation Cooperative rolling mill apparatus and process
US4414832A (en) * 1981-09-11 1983-11-15 Olin Corporation Start-up and steady state process control for cooperative rolling
US4478064A (en) * 1982-03-04 1984-10-23 Olin Corporation Modifications to a cooperative rolling system for increasing _maximum attainable reduction per pass
US4781050A (en) * 1982-01-21 1988-11-01 Olin Corporation Process and apparatus for producing high reduction in soft metal materials
US20040020258A1 (en) * 2000-08-24 2004-02-05 Holger Behrens Method and device for tension levelling a cold-rolled strip and regulating the degree of levelling
US6691541B2 (en) * 2001-03-26 2004-02-17 Bwg Bergwerk- Und Walzwerk -Maschinenbau Gmbh Stretch leveler for steel and other metal strip
CN112566733A (zh) * 2018-08-15 2021-03-26 穆尔和本德公司 用于在金属带的柔性轧制时调节带材张力的装置、轧制设备和方法

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DE1029782B (de) * 1955-01-26 1958-05-14 Ernst Thomas Vorrichtung zum Entzundern von bandartigen Erzeugnissen, insbesondere Bandeisen
DE1225131B (de) * 1955-05-31 1966-09-22 Vernon R Powell Verfahren und Vorrichtung zum Herstellen von Rohren
LU38595A1 (fr) * 1959-05-06
DE1255073B (de) * 1959-05-06 1967-11-30 Gen Electric Verfahren zum Kaltverformen langgestreckter Metallwerkstuecke
DE1264201B (de) * 1960-10-04 1968-03-21 Celanese Corp Einrichtung zum laufenden Fuehren einer elektrisch nicht leitenden Materialbahn

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US2332803A (en) * 1941-12-20 1943-10-26 Carnegie Illinois Steel Corp Method and apparatus for reducing metal bodies

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US556193A (en) * 1896-03-10 Sheet-metal-rolling mill
DE252151C (fr) *
US1983387A (en) * 1931-06-15 1934-12-04 Gen Electric Method of working metal
US2040442A (en) * 1932-11-30 1936-05-12 Bethlehem Steel Corp Method of treating sheet metal
US2226948A (en) * 1936-01-11 1940-12-31 Simons Abraham Method of rolling
US2176094A (en) * 1936-05-29 1939-10-17 Carl E Moore Method of treating strip metal
US2177711A (en) * 1937-03-05 1939-10-31 Aluminum Co Of America Metal rolling process
US2306792A (en) * 1939-06-15 1942-12-29 Carl E Moore Method of treating annealed strip steel
US2316067A (en) * 1939-06-20 1943-04-06 Bell Telephone Labor Inc Method of threading rolling mills
US2287380A (en) * 1940-10-15 1942-06-23 Clarence J Klein Metal rolling
US2332796A (en) * 1941-01-25 1943-10-26 Carnegie Illinois Steel Corp Reduction of elongated bodies
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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136184A (en) * 1961-03-15 1964-06-09 Nat Steel Corp Method and apparatus for the treatment of cold rolled metal strip
US3238756A (en) * 1961-05-03 1966-03-08 Gen Electric Material forming method and apparatus
US3253445A (en) * 1962-07-09 1966-05-31 Metal Box Co Ltd Apparatus for rolling strip metal
US3245244A (en) * 1963-08-07 1966-04-12 Natalis H Polakowski Mechanism for flattening metal strip
US3362202A (en) * 1964-07-03 1968-01-09 Loire Atel Forges Strip tensioning apparatus
US3394574A (en) * 1965-04-02 1968-07-30 Metal Box Co Ltd Treatment of strip metal
US3332292A (en) * 1965-04-07 1967-07-25 United States Steel Corp Method and apparatus for rolling strip
US3394577A (en) * 1965-05-19 1968-07-30 Textron Inc Rolling mill
US3374653A (en) * 1965-05-28 1968-03-26 Kaiser Aluminium Chem Corp Strip leveling apparatus
US3377830A (en) * 1965-06-18 1968-04-16 United States Steel Corp Method and apparatus for reducing strip
US3823593A (en) * 1969-06-26 1974-07-16 V Vydrin Method of rolling metal sheet articles between the driven rolls of the roll mill
US3709017A (en) * 1969-06-26 1973-01-09 V Vydrin Method of rolling metal sheet articles between the driven rolls of the roll mill
US3811307A (en) * 1971-06-28 1974-05-21 V Sosjurko Method of rolling metal sheet articles
US3871221A (en) * 1972-12-01 1975-03-18 Vladimir Nikolaevich Vydrin Continuous strip rolling mill
US3889505A (en) * 1973-02-07 1975-06-17 Ungerer Irma Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations
US4244203A (en) * 1979-03-29 1981-01-13 Olin Corporation Cooperative rolling process and apparatus
US4291562A (en) * 1979-09-20 1981-09-29 Orr Howard S Three roll tension stand
US4412439A (en) * 1981-05-04 1983-11-01 Olin Corporation Cooperative rolling mill apparatus and process
US4414832A (en) * 1981-09-11 1983-11-15 Olin Corporation Start-up and steady state process control for cooperative rolling
US4781050A (en) * 1982-01-21 1988-11-01 Olin Corporation Process and apparatus for producing high reduction in soft metal materials
US4478064A (en) * 1982-03-04 1984-10-23 Olin Corporation Modifications to a cooperative rolling system for increasing _maximum attainable reduction per pass
US20040020258A1 (en) * 2000-08-24 2004-02-05 Holger Behrens Method and device for tension levelling a cold-rolled strip and regulating the degree of levelling
US6925845B2 (en) * 2000-08-24 2005-08-09 Sms Demag Aktiengesellschaft Method and device for tension leveling a cold-rolled strip and regulating the degree of leveling
US6691541B2 (en) * 2001-03-26 2004-02-17 Bwg Bergwerk- Und Walzwerk -Maschinenbau Gmbh Stretch leveler for steel and other metal strip
CN112566733A (zh) * 2018-08-15 2021-03-26 穆尔和本德公司 用于在金属带的柔性轧制时调节带材张力的装置、轧制设备和方法
CN112566733B (zh) * 2018-08-15 2023-09-01 穆尔和本德公司 用于在金属带的柔性轧制时调节带材张力的装置、轧制设备和方法

Also Published As

Publication number Publication date
CH254593A (fr) 1948-05-15
GB585165A (en) 1947-01-31
FR922283A (fr) 1947-06-04
DE921502C (de) 1954-12-20

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