US3138982A - Strip rolling method - Google Patents

Strip rolling method Download PDF

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Publication number
US3138982A
US3138982A US206411A US20641162A US3138982A US 3138982 A US3138982 A US 3138982A US 206411 A US206411 A US 206411A US 20641162 A US20641162 A US 20641162A US 3138982 A US3138982 A US 3138982A
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United States
Prior art keywords
strip
along
rollers
reducing
mill
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Expired - Lifetime
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US206411A
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English (en)
Inventor
Claus L Sporck
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Lodge and Shipley Co
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Lodge and Shipley Co
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Publication date
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Priority to US206411A priority Critical patent/US3138982A/en
Priority to GB2530563A priority patent/GB1053752A/en
Priority to FR936616A priority patent/FR83957E/fr
Priority to BE634274D priority patent/BE634274A/xx
Application granted granted Critical
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    • 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
    • B21B1/42—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 step-by-step or planetary rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers

Definitions

  • crown on strip stock has been removed by an abrasive belt type grinding line set up as the final stand of the rolling mill or set up independently of the mill and arranged to handle bands or coils.
  • Grinding lines of the ldnd mentioned have several disadvantages, for example, limitations on the maximum width of strip, the effects of heat generated by grinding, non-uniformity of thickness due to belt wear and waste of material. The latter is particularly undesirable because in many de-crowning operations by abrasive belts up to as much as about 10% of the total thickness is ground oil.
  • the principal object of the present invention is to provide improved methods of removing crown from strip stock at relatively high rates of speed, without waste of crown material and with the finished strip having a thickness tolerance accurate to a fraction of a thousandth substantially uniform over the strip.
  • FIGURE 1 is a diagrammatic isomeric view of a strip being worked in accordance with the invention
  • FIGURE 2 is a cross section of the strip of FIGURE 1 illustrating the configuration of the strip as it is being worked;
  • FIGURE 3 is a fragmentary plan view illustrating the locus of the reductions as taken on the strip
  • FIGURES 4 and 5 are respectively elevational and plan views and illustrating how the strip of FIGURE 1 is worked while maintained in the form of a loop;
  • FIGURE 6 is a diagrammatic isomeric view of a strip being worked in accordance with the invention, the working being done in somewhat different manner than in FIG- URE 1;
  • FIGURE 7 is a cross section of the strip of FIGURE 4 illustrating the reduction in thickness and widening of the strip;
  • FIGURE 8 is a diagrammatic isometric view of a strip being worked in accordance with the invention, the manner of working being somewhat difierent than that shown in FIGURES l and 6;
  • FIGURE 9 is a cross section of the strip of FIGURE 5 illustrating the reduction in thickness and widening of the strip.
  • FIGURE 1 I have diagrammatically illustrated a mill for practicing the invention.
  • This comprises a plurality of reducing rollers R which extend from a roller 1 along the dot and dash lines 2 to a roller 3.
  • the reducing rollers are rotatable about horizontal axes.
  • Below the several reducing rollers are a plurality of back-up rolls BR.
  • the first back-up roll 4 is just below the reducing roller 1 and the back-up roll 5 is just below the reducing roller 3 and the back-up rolls intermediate the rolls 4 and 5 are disposed below corresponding reducing rollers.
  • the back-up rolls are rotatable about horizontal axes.
  • On the far side of the mill are a plurality of guide rolls GR which are rotatable about vertical axis. The guide rolls are disposed along a straight line as between the guide roll 6 and the guide roll 7.
  • the strip S may be coming from a band or coil or coming directly from a strip mill. In either event, the strip has a width Wand a thickness T which includes the crown (not shown).
  • the leading edge 8 of the strip S is fed into the mill between the reducing roller 1 and back-up roll 4 and then the strip is moved through the mill in a direction indicated by the arrow 10 between the other reducing rollers and back-up rolls.
  • the leading edge 8 (or any other similar portion of the strip) has moved from the roller 1 through and beyond the roller 3, it has made a complete traverse through the mill. It will be understood that movement through the mill is effected by power driving the reducing and/ or the back-up rolls. Motion of the strip through the mill is continuous and uninterrupted.
  • the effect of moving the strip through the mill between the reducing and backup rolls is to reduce the thickness of the strip to a desired dimension and to expand the strip in a widthwise direction.
  • Sufiicient reduction is taken so that the finished strip FS is free of crown.
  • the reduction in thickness is dependent upon the spacing between the reducing rollers R and the corresponding back-up rolls BR. In the present arrangement, the space between each pair of reducing and back-up rolls is the same.
  • the amount of widthwise expansion is a function of the amount of reduction.
  • the strip is maintained in lateral or widthwise position by virtue of the fact that the far edge 11 is held by the guide rolls GR and the central part by the reducing rollers R.
  • the near edge 12 of the strip is free and this edge expands in a direction away from the reducing rollers.
  • the present invention utilizes the concept of incremental reduction as disclosed in my above-mentioned copending application.
  • the working surfaces of the various reducing rollers R are relatively thin, being substantially smaller than the width of the strip.
  • a thin reducing roller R rolling into the strip, one very small increment after another is reduced or displaced progressively along a straight path.
  • This kind of reduction is repeated successively along similar paths by virtue of simultaneously operating reducing rollers.
  • FIGURE 1 there are a plurality of reducing rollers which are spread across the face of the strip and each roller taking a very small bite or effecting very small incremental reductions along its path.
  • the axis A represents the longitudinal axis of the strip S.
  • the axis A is equi-distant from the parallel edges 11 and 12 of the strip.
  • the strip in FIG- URE 1 is oriented horizontally and a vertical plane diagrammatically indicated at P and containing the axis A will also contain a thickness dimension (T and T).
  • the various back-up rolls BR extend at right angles to the axis A.
  • the reducing rollers R are arranged so that as the strip is moved through the mill, the rollers displace the blank along paths which are parallel to each other and to the axis A and plane P. A vertical plane through any of these paths will be parallel to the plane P.
  • the reducing rollers R are spaced from one another in a direction along the axis A and various simultaneous reductions of the reducing rollers take place at points which are axially spaced from one another.
  • the various simultaneous reductions being performed on the strip are represented by the dashes 13. It will be seen that the locus of the dashes extends between the opposite edges 11 and 12 and is acute to the longitudinal axis A.
  • the guide rolls GR are set up in conjunction with the end rollers 1 and 3 so that roller 1 works that portion of the blank which is parallel with and/ or co-extensive with the edge 12 and the reducing roller 3 works that portion of the blank which is parallel with or co-extensive with the edge 11.
  • the various rollers intermediate the rollers 1 and 3 work corresponding portions of the strip.
  • the lead roller 1 reduces adjacent increments of the strip progressively along the path 14 which is co-extensive with edge 12.
  • the small dots making up the path 14 can be thought of as the small adjacent increments which are progressively reduced by the roller.
  • the reducing operation forms a groove 14a indicated in FIGURE 2.
  • the other reducing rollers such as the rollers 15 and 16 respectively roll adjacent increments of the strip with the reducing being progressive along paths 17 and 18.
  • the action of the rollers 15 and 16 form grooves 17a and 18a as shown in FIGURE 2.
  • the grooves 17a and 18a have the effect of widening the original groove 14a.
  • the width of the reduced increments (or of the grooves 14a, 17a, 18a, etc.) taken in a direction widthwise of the strip or normal to the plane P, is very small being substantially less than the Width W of the strip.
  • each increment of material previously in the area of the groove 14a can be thought of as being displaced into the area indicated by 14b; the material formerly in the area of the groove 1711 can he thought of as being displaced into the space 17b; and so on across the strip to the roller 3.
  • the portion of the blank which is worked by this roller is in the nature of a narrow ridge running along the edge 12.
  • the expanding portion of the strip as indicated by AE has the thickness dimension T which is the same as the spacing between the backup rolls and the reducing rollers.
  • the final reduction is performed by the trailing roller 3 and with this reduction, the final expansion takes place and the strip is increased in width in an amount as indicated at E and has a thickness T
  • the finished strip FS is free from crown.
  • FIGURE 1 I have shown the worked portion 20 and the unworked portion 21 (both within the mill) as being separated by a smooth ridge 22.
  • This ridge is diagrammatic as it will be understood that the ridge is comprised of a series of off-set sections, the exact configuration of which depends upon the number of reducing rollers, their diameters and their respective axial spacing.
  • the reducing rollers R are of the same diameter and are spaced in a widthwise direction so as to produce a smooth surface on the worked portion 20 of the strip.
  • the working or reducing surfaces of adjacent rollers are slightly overlapping in the widthwise direction.
  • the preferred spacing of the rollers in a direction along the axis A is such that the rotational axes of adjacent rollers are separated by a distance slightly greater than the roller diameter.
  • the strip is maintained in planar condition as it is being worked or moved through the mill.
  • This has the advantage of reducing the amount of floor space necessary for the mill and is conducive for setting up several mills in tandem. For example, in a situation Where it is required to remove the crown in a plurality of stages, a four stage mill can be set up where each stage takes care of one quarter of the material to be rolled down.
  • FIGURES 4 and 5 A typical arrangement for maintaining the strip of FIGURE 1 in a generally loop form during working is shown in FIGURES 4 and 5.
  • FIGURES 4 and 5 assume that the right hand end (FS) of the strip of FIGURE 1 has been moved around counterclockwise until it is adjacent the roller 1.
  • the numbers and letters designating various parts of the strip in FIGURES 4 and 5 are the same as those used in FIGURE 1 to designate corresponding parts except that the numbers and letters of FIGURES 4 and 5 have prime marks.
  • a relatively large back-up roll 24 is provided with trunnions 25 by means of which the roll is mounted for rotation.
  • the back-up roll 24 is equivalent to the backup rolls BR in FIGURE 1.
  • Spaced around the surface of the roll 24 are a plurality of reducing rollers R. These are equivalent to the reducing rollers R in FIGURE 1.
  • the reducing rollers extend from the lead roller 1' along the dot and dash lines 26, around the surface of the roll 24 to the trailing roller 3'.
  • the strip S enters the mill underneath the upper positioning roll 27 and thence between the various reducing rollers R and the surface of the back-up roll 24.
  • the finished strip FS' exits around the lower positioning roll 23.
  • the strip is moved through the mill by power driving the back-up roll 24 and/ or the reducing rollers R.
  • the edge 11 of the strip is held on the shoulder 29 of the roll 24.
  • the shoulder 29 corresponds to the guide rolls GR in FIGURE 1.
  • FIGURES 4 and 5 the strip is worked so that it is widened and de-crowned in accordance with the principles and in the same manner as described in connection with FIGURE 1.
  • FIGURE 6 I have diagrammatically illustrated another mill for practicing the invention.
  • the strip is worked utilizing the same principles as described in connection with FIGURE 1 and therefore only a very brief description of the mill of FIGURE 6 is considered necessary.
  • the strip 8-1 in FIGURE 6 is worked by a plurality of reducing rollers which extend respectively from opposite edges of the strip toward the center.
  • the reducing rollers extend from a roller 30 along a dot and dash line 31 to a roller 32 which is located along the axis A-I of the strip. From the roller 32 the group extends along the dot and dash lines 33 to end roller 34.
  • the rollers 30 and 34 are located opposite one another and the rollers adjacent the rollers 30 and 34 are also located opposite each other. Each such pair of rollers along the lines 31 and 33 are also at opposite positions on either side of the axis A-ll.
  • the various reducing rollers have back-up rolls indicated at BR-l.
  • the strip S-1 has width W and thickness T
  • the lead rollers 30 and 34 are spaced apart so that as the leading edge 35 of the strip is moved into the rollers 30 and 34, they will operate respectively co-extensive with the strip edges 36 and 37.
  • the rollers 30 and 34 move along paths indicated by the dotted lines 33 and 39 coextensive with the edges 36 and 37 and parallel with the axis A-l.
  • the movement along the paths 33 and 39 forms grooves (FIG. 7) 38a and 39a.
  • the pairs of rollers along the lines 31 and 33 respectively reduce increments along their respective paths and form grooves which have the effect of widening the grooves 38a and 39a.
  • the trailing roller 32 rolls down the final piece of the strip which is co-extensive with the axis A-l.
  • the unworked portion 40 of the strip assumes a generally triangular shape as the strip is going through the mill.
  • the unworked portion 40 and the worked portion 41 are shown as separated by the ridge 42.
  • Each pair of rollers takes the same incremental reduction and the strip equally expands on opposite sides of the axis A-l.
  • the expanding edges are indicated by AE/ 2 in FIGURE 7, where E is the total expansion.
  • the total expansion on each side is designated by E/2 in FIGURE 6.
  • the finished strip FS-l is expanded to a width equal to W-l-E and has the desired thickness T this thickness being uniform over the strip area.
  • the finished strip FS-l is free from crown.
  • the locus of the reductions of the various reducing rollers is comprised of the two lines (like the lines 31 and 33) which intersect at the roller 32 and respectively extend at an acute angle to the longitudinal axis of the strip.
  • the mill illustrated in FIGURE 6 can be arranged similarly as shown in FIGURES 4 and 5 so that the strip S1 is maintained in a loop form as it is being worked.
  • the mill of FIGURE 8 is an arrangement somewhat similar to the arrangement of FIGURE 6 in that the various reducing rollers R-2 are arranged in generally triangular form.
  • the strip is worked utilizing the same principles as described heretofore and only a 'very brief explanation of the working of the strip in FIGURE 8 is necessary.
  • the leading edge 43 of the strip S-Z first engages the lead roller 44 and is moved through the mill past the trailing rollers 45 and 46.
  • the various other reducing rollers extend from the roller 44 along the dot and dash lines 50 and 51 respectively to the rollers 45 and 46.
  • the lead roller 44 effects its reductions along a path which is co-extensive with the axis A-2 and the other pairs of rollers arranged along the lines 50 and 51 efiect reductions along parallel paths.
  • the rollers 45 and 46 eflect reductions along paths which are co-extensive with the opposite edges of the strip.
  • the unworked portion 52 of the strip assumes a somewhat ⁇ l-shape.
  • the ridge 53 represents the separating point between the unworked portion 52 and the worked portion 54.
  • the lead roller 44 forms a groove 44a and this groove is widened on both sides by the working of the various pairs of rollers along the lines 5th and 51.
  • Each pair of rollers takes the same incremental reduction and the strip equally expands on opposite sides of the axis A-2.
  • the expansion of the strip on either edge is indicated by AE/ 2, where E is the total expansion.
  • the expanding portions each have thickness T This condition remains until the final reductions are taken by rollers 45 and 46.
  • the total expansion on each side is designated by E/ 2.
  • the number of pairs of rollers along the lines 50 and 51 including the rollers 45 and 46 and their respective widthwise spacing takes into account the widthwise expansion of the strip with thickness T up to the final reductions of rollers 45 and 46.
  • the finished strip FS-Z has a width which is equal to W+E and a thickness T which is uniform over the strip area.
  • the finished strip is free from crown.
  • a method of removing crown on metal strip stock comprising the steps of:
  • a method of removing crown on metal sheet stock comprising the steps of:
  • the method of removing crown on metal strip stock comprising the steps of:
  • the method of removing crown on metal strip stock crown comprising the steps of: 8. A method of widening and providing precise thicktaking a piece of strip stock having crown; ness dimension in metal strip stock comprising the steps working the strip to reduce its thickness to a desired f;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US206411A 1961-07-03 1962-06-29 Strip rolling method Expired - Lifetime US3138982A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US206411A US3138982A (en) 1962-06-29 1962-06-29 Strip rolling method
GB2530563A GB1053752A (el) 1961-07-03 1963-06-25
FR936616A FR83957E (fr) 1961-07-03 1963-06-27 Procédé et dispositif de laminage ainsi que les produits conformes à ceux obtenusou similaires
BE634274D BE634274A (el) 1962-06-29 1963-06-28

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US206411A US3138982A (en) 1962-06-29 1962-06-29 Strip rolling method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656332A (en) * 1957-06-19 1972-04-18 Rotary Profile Anstalt Metal working

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1814594A (en) * 1926-06-21 1931-07-14 Harvey M Gersman Apparatus for widening rolled metal products
US2287091A (en) * 1940-04-11 1942-06-23 Charles B Cushwa Method and apparatus for making dished heads
US2367226A (en) * 1940-05-10 1945-01-16 Foster Wheeler Corp Apparatus for producing extended surface tubular members

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1814594A (en) * 1926-06-21 1931-07-14 Harvey M Gersman Apparatus for widening rolled metal products
US2287091A (en) * 1940-04-11 1942-06-23 Charles B Cushwa Method and apparatus for making dished heads
US2367226A (en) * 1940-05-10 1945-01-16 Foster Wheeler Corp Apparatus for producing extended surface tubular members

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656332A (en) * 1957-06-19 1972-04-18 Rotary Profile Anstalt Metal working

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