US2170732A - Rolling mill - Google Patents

Rolling mill Download PDF

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Publication number
US2170732A
US2170732A US742075A US74207534A US2170732A US 2170732 A US2170732 A US 2170732A US 742075 A US742075 A US 742075A US 74207534 A US74207534 A US 74207534A US 2170732 A US2170732 A US 2170732A
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United States
Prior art keywords
rolls
mill
rolling
working rolls
speed
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
US742075A
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English (en)
Inventor
Sendximir Tadeusz
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American Rolling Mill Co
Original Assignee
American Rolling Mill Co
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
Priority to BE404414D priority Critical patent/BE404414A/xx
Application filed by American Rolling Mill Co filed Critical American Rolling Mill Co
Priority to US742075A priority patent/US2170732A/en
Application granted granted Critical
Publication of US2170732A publication Critical patent/US2170732A/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
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls

Definitions

  • This invention relates to mills for rolling strips and similar fiat material of great widths and comparatively thin gauges, in long lengths, usin backed-up working rolls of small diameter.
  • This invention relates to mills in which the backing-up elements are mounted upon shafts which are supported, at frequent intervals, by
  • Figures 1 and 2' show the general arrangement of the mill in front elevation and in a vertical transverse section, respectively.
  • I Figs. 3 and 4 show the side view of the frame withdetails of the roll-adjusting apparatus.
  • Figs. 5 and 6 show a longitudinal and ,cross section of the shaft bearing the roll-supporting elements, together with e'xcentrically' adjustable supporting bearing members.
  • Figs. 7 and 8 show another way of adjusting such excentric bearing'member, in longitudinal and cross section, respectively.
  • Figs. 9 and 10 show schematically, in cross section and in top view, the gearing arrangement of the mill, including one way in which the predetermined stretch adjustment may be put into effect.
  • bearing members 2 the bore of which fits the shafts 3 which bear the supporting rings 4.
  • the bore of the bearing member, or of at least onerow of them, is excentric with their outside diameter, so that by adjusting the angular position of .the individual bearing members, a similar effect may be produced, as by adjusting the crown of the working rolls, by grinding them.
  • the construction of the backing elements for 10 the working rolls can best be understood by reference to Figs. 5 to 8, inclusive.
  • the working rolls l3 may contact directly with the backing elements 4 which are mounted on four shafts 3, 15
  • i represents a channel which in cross-section is an arc of a circle, bored in :5 the mill frame beam 20.
  • Bearing members 2 fit snugly in these channels I, and are spaced apart by half bushings 9.
  • the shafts 3 rest on their respective bearing members 2 and carry the eccentric barrels I I between the members 2.
  • Each 30 of the eccentric barrels ii carries the backing rings 4 which areof a construction similar to a roller bearing with a thicker outer rail. It is of course understood that if Fig. 5 were carried out toward the right and left it would show alternately placed bearing members 2 and backing rings 4, all the way across between the vertical colunms of the mill housing.
  • the rings 4 contact the working rolls i3 or the intermediate rolls 5, respectively, as described above.
  • Figs. '7 and 8 represent a modification of the roll support, in which the bearing members 2 are not only fitted into the bores of the channels i, but are also guided axially therein, thus eliminatingthe half bushings 9.
  • the bearing members 2 are fitted with caps bolted on as shown for the purpose of better holding the shaft 3.
  • the backing rings 4 are of a slightly different construction than those shown in Fig. 5, and are mounted individually between the hearing members 2 instead of in pairs as shown in Fig. 5. It is of course understood that Fig. '7 similarly to Fig. 5, is only a partial view.
  • Fig. 8 shows the three shafts. 3 supported in the frame,
  • the rings 4 contact with the intermediate rolls 5, which in turn support the working rolls l3.
  • the bearing member 2 was omitted to clearly show the construction of the backing ring 4.
  • Semi-circular channels I with separate bearing members 2 represent big advantages over either projections machined in the frame beam, to support directly the necks of shaft 3, or planed channels of other sections, than round.
  • the high specific pressures on the .bore of bearing member 2 can only be supported when both surfaces are hardened and ground, as is possible with semi-circular bearing members 2.
  • semicircular channels I can be machined to much closer tolerances, than other sections, and such very small tolerances are essential for the correct operation of this type of mill.
  • the edge of the strip is detrimental, as it causes a deflection of the end of the roll towards the strip and so causes the vicinity of that edge to become wavy and thinner in gauge.
  • the adjustment of the bearing members 2 is obtained either as in Fig. 6 by removing clamp 6, turning the bearing member 2 by hand to the desired position and then replacing clamp 6 and securing it by screw 1, so that it engages small teeth 8 on a part of the outside diameter of bearing member 2.
  • a difference of one tooth would give an adjustment of a few ten-thousandths of an inch. A fraction thereof may e locking in position bearing members 2.
  • FIG. 7 Another method of adjusting the angular position of bearing members 2 is shown in Figs. 7 and 8.
  • the bearing member 2 is wider at its periphery and a part of it is toothed to engage with worm I so that adjustment can be obtained by turning worm H) the shaft of which can be reached from outside.
  • At least one, and preferably two symmetrically disposed roll-supporting ring carrying shafts 3 have excentric barrels interposed between each two necks, so that by turning the shaft 3 a vertical displacement of the working rolls I3 is obtained.
  • a worm gear segment II at each end of the roll-carrying shafts 3, securely coupled with it.
  • An accurate adjustment of the angular position of the shafts 3 may be obtained by any known and approved means. I prefer to obtain it by the use of one shaft 15 carrying two worms, one right and one left, engaging the two sectors said shaft I 5 having one worm gear l6 keyed onto its end and actuated by one shaft I! which engages by means of two identical worms both worm gears l6, one
  • Fig. 2 shows the general arrangement of the mill.
  • the strip l8 passes successively through brakes or the like l9, a pair of working rolls I3 supported as described in the frame 20, then round the stretching block l2 and under driven rolls 2
  • the free ends of the strip may either be reeled up, for each pass, or may preferably be joined together and led over a sheave, not shown on the drawings.
  • the distance between the latter and the mill must of course be variable, to provide for the increasing length of the strip; and I prefer to apply a tension on that portion of the strip which lies outside of the machine.
  • podtive gearing such as a pair of gears 23 and 24 to the lower roll and a chain drive 25 and 26 to the upper, while .the drive of the stretching block, although it is quite positive, allows a certain fine adjustment of ratio.
  • Figs. 9 and 10-sh0w a modification of this latter system wherein, through the use of a planetary gearing and other arrangements, it is possible to transmit through the variable speed gearing only. a small percentage of the total power, such as one or two percent.
  • Pinion 33 is keyed onto the shaft 22 and drives gear 3i, which is rotatable on shaft 22 and carries thedriving sprocket 28, linked by chain to the sprocket 29, theshaft of which drives the gear 30 for the drum l2.
  • has its internally directed teeth in mesh with and driven through one or more planetary pinions 32.
  • the latter turn round pins H which are secured in the web of the sprocket 34 which is free to rotate on the shaft 22.
  • the sprocket II is coupled with the worm 39 which is driven, through suitable gearing, from the motor 38 of a variable speed positive hydraulic gear or any other mechanical or electrical gearing of the kind with adjustable ratio and little or no slipping.
  • is provided by worm wheel 43 and sprocket 44, the latter driving a chain that engages sprocket 34.
  • the other end of such gear, as the hydraulic pump 31, is driven preferably from some part of the mill gearing, such as the intermediate shaft 42, through belt sheaves and 36.
  • the adjusting wheel of the variable speed gear is set at naught, worm ll does not rotate while the mill is in motion and the gearing from the main shaft 22 both to the working rolls I3 1 risk of the strip breaking.
  • the stretching block i2 is a fixed ratio posi-' tive gearing and should be such as to make the tangential speed of the stretching block slightly higher, for mild steel about two percent higher than the tangential speed of the working rolls.
  • compensating gearing above described could be so proportioned as to take care also of this factor, but I prefer to use it solely to obtain the very fine adjustment and use other means, such as replace the chain pinion 28, with a smaller one, when the comparatively small range of adjustment of the compensating gearing is passed.
  • a, frame having at least two vertical columns and horizontal crossmembers forming rigidly connected beams therebetween, said entire frame being formed of one piece of -metal whereby the bending resistance of the columns and the increased rigidity of the beams helps to decrease the deflection of the working rolls produced by roll pressure, small-thickness working rolls in said frame, shafts mounted in said frame backing up elements for said working rolls carried on said shafts, and members directly supported on said beams engaging said shafts at a plurality of points across said beams, said beams being formed with channels across them, said channels having a section of an arc of a circle, and said members having curved surfaces engaging said. channels but eccentrically-to the shaft supports therein, and means for adjusting their position in said channels for the purpose described.
  • That method of rolling under tension which consists in passing a piece between working rolls and applying a pullto the piece as it leaves the rolls which bears a positive definite speed relation to the peripheral speed of the rolls.
  • a method of reducing metal which comprises rolling said metal and during said step, advancing said metal under force beyond said mill with a linear speed which bears a positive constant relationship to the peripheral speed of the rolls of said mill.
  • two instrumentalities one of which is substantially only a reducing instrumentality and the other of which is substantially Ionly an advancing instrumentality and means for maintaining the speed of said two instrumentalities at a fixed, predetermined proportional interrelationship.
  • a device for rolling metal two instrumentalities, one of which is substantially only a reducing instrumentality and the other of which is substantially only an advancing instrumentality, means for maintaining the speeds of said two instrumentalities at a. fixed predetermined proportional interrelationship, and means for adjusting the speeds of said instrumentalities to different proportional interrelationships.
  • a method of .rolling under tension which consists in passing a piece between working rolls and advancing said piece beyond said working rolls at a speed sufficient to produce a tension in said piece, but at a linear speed which continuously bears a constant predetermined positive relationship to the speed of said rolls.
  • a method of rolling under tension which consists in passing a piece through working rolls, simultaneously feeding said piece beyond said rolls by means having substantially no reducing function so as to produce a tension therein, and positively proportioning the effect of said feeding means to the reduction produced by said rolls so as to maintain the elongation constant in spite of variations in the piece, by causing said feeding means to operate at a speed definitely related to the speed of the rolls.
  • a process of rolling under tension which comprises passing a piece through a mill and advancing said piece at least beyond said' mill by means having substantially no reducing function and continuouslyand positively maintaining, during the rolling process, a constant predetermined elongation in the piece, by advancing said pieces at a speed bearing a fixed relationship to the speed of the rolls of said mill.
  • That method of producing band or strip of great width as compared to its thickness by rolling under tension which consists in passing a piece between working rolls and applying a pull to the piece as it leaves these rolls so as to control the linear speed of the piece, and positively causing the said linear speed to bear a constant and definite-relationship to the peripheral speed of the rolls.
  • a process of rolling under tension which comprises passing a piece through working rolls, and continuously advancing said piece beyond said rolls at a predetermined, positively fixed speed which is faster than the peripheral speed of said working rolls.
  • a frame having at least two vertical columns and horizontal cross members adapted to take up the deflection of the working rolls throughout their entire length, said frame constituting statically, as regards roll pressure reactions, one entire block whereby the bending'resistance of the columns and the increased rigidity of the beams help to decrease the deflection'of the working rolls, and means for controlling the pass clearance of the mill while maintaining the respective relation of the various mill housing members.
  • a frame having at least two vertical columns and horizontal cross members adapted to, take up the deflection of the working rolls throughout their entire length, said frame constituting statically, as regards roll pressure reactions, one entire block whereby the bending resistance of the columns and the increased rigidity of the beams help to decrease the deflection of the working rolls, small thickness working rolls in said frame, shafts mounted in said frame, and backing up elements for said working rolls carried on said shafts, and members directly supported on said beams engaging said shafts at a plurality of points acres said beams and means for controlling the pass clearance of the mill while maintaining the respective relation of the various mill housing members.
  • a mill adapted to produce a certain predetermined elongation, a non-reducing strip advancing means, and means for driving said strip advancing means at a speed relation to the mill rolls required .to produce said predetermined elongation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US742075A 1934-08-30 1934-08-30 Rolling mill Expired - Lifetime US2170732A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE404414D BE404414A (enrdf_load_stackoverflow) 1934-08-30
US742075A US2170732A (en) 1934-08-30 1934-08-30 Rolling mill

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US742075A US2170732A (en) 1934-08-30 1934-08-30 Rolling mill

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479974A (en) * 1943-05-05 1949-08-23 Armzen Company Design and construction of rolling mills
US2501024A (en) * 1944-12-28 1950-03-21 Borg Warner Rolling mill feed tensioning device
US2797476A (en) * 1952-06-17 1957-07-02 Sendzimir Tadeusz Process and apparatus for treating metallic strips
US2882554A (en) * 1955-09-02 1959-04-21 Heck Friedrich Production of strips or bands from metal powder
US3043170A (en) * 1959-08-28 1962-07-10 United States Steel Corp Rolling mill and retractable stand therefor
US3076360A (en) * 1958-08-22 1963-02-05 Sendzimir Tadeusz Clam shell cold rolling mill
US3184943A (en) * 1960-09-06 1965-05-25 Ajax Mfg Co Wire shaping and drawing
DE4292012T1 (enrdf_load_stackoverflow) * 1991-06-20 1993-07-15 Kabushiki Kaisha Kobeseikosho, Kobe, Hyogo, Jp
US20060254335A1 (en) * 2005-05-10 2006-11-16 T. Sendzimir, Inc. Side supported 6-high rolling mill

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479974A (en) * 1943-05-05 1949-08-23 Armzen Company Design and construction of rolling mills
US2501024A (en) * 1944-12-28 1950-03-21 Borg Warner Rolling mill feed tensioning device
US2797476A (en) * 1952-06-17 1957-07-02 Sendzimir Tadeusz Process and apparatus for treating metallic strips
US2882554A (en) * 1955-09-02 1959-04-21 Heck Friedrich Production of strips or bands from metal powder
US3076360A (en) * 1958-08-22 1963-02-05 Sendzimir Tadeusz Clam shell cold rolling mill
US3043170A (en) * 1959-08-28 1962-07-10 United States Steel Corp Rolling mill and retractable stand therefor
US3184943A (en) * 1960-09-06 1965-05-25 Ajax Mfg Co Wire shaping and drawing
DE4292012T1 (enrdf_load_stackoverflow) * 1991-06-20 1993-07-15 Kabushiki Kaisha Kobeseikosho, Kobe, Hyogo, Jp
US20060254335A1 (en) * 2005-05-10 2006-11-16 T. Sendzimir, Inc. Side supported 6-high rolling mill
US7185522B2 (en) 2005-05-10 2007-03-06 T. Sendzimir, Inc. Side supported 6-high rolling mill

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Publication number Publication date
BE404414A (enrdf_load_stackoverflow)

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