US3789646A - Planetary mill for producing scallop-free strip - Google Patents

Planetary mill for producing scallop-free strip Download PDF

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Publication number
US3789646A
US3789646A US00295345A US3789646DA US3789646A US 3789646 A US3789646 A US 3789646A US 00295345 A US00295345 A US 00295345A US 3789646D A US3789646D A US 3789646DA US 3789646 A US3789646 A US 3789646A
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United States
Prior art keywords
roll
rolls
cam
work
slab
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Expired - Lifetime
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US00295345A
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English (en)
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T Sendzimir
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T Sendzimir Inc
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T Sendzimir Inc
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    • 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
    • B21B13/18—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for step-by-step or planetary rolling; pendulum mills
    • B21B13/20—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for step-by-step or planetary rolling; pendulum mills for planetary rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
    • B21B31/30—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by wedges or their equivalent

Definitions

  • the disclosure teaches that as a particular work roll enters the roll bite, its diametrically opposite work roll engages a cam.
  • the cam has a surface corresponding generally to the circular orbit of the work roll, but is modified so as to deviate from such orbit by a very small amount.
  • An initial deviation may cause the work roll diametrically opposite the rolls which are in engagement with the cam to engage the slab at a more acute angle to the passline, and a final deviation may cause the work rolls which are diametrically opposite rolls in contact with the cam, to follow a path parallel to the passline as they leave the roll bite.
  • FIG. 1 is a longitudinal cross sectional view through The present invention relates to an improvement in 5 a mill according to the present invention.
  • the above mentioned difficulties are overcome by causing the work rolls of the planetary mill to deviate very slightly from their circular orbit during the last portion of their contact with the workpiece, so that during this last portion of their contact with the workpiece their path is parallel to the passline.
  • the planetary mill will produce a finished strip and it is possible to eliminate the conventional planishing mill.
  • the temperature of the workpiece increases by as much as 50 to 100 C. in the roll bite,.the initial overheating of the slab can be eliminated with the consequent reduction in scale losses and improvement of the surface.
  • the present invention also contemplates a modification in the path of the workroll at its entry into the roll bite whereby the angle of entry is reduced or made more acute with respect to the pass line. If there are slivers present in the slab, such defects tend to open up during rolling on ordinary planetary mills and produce surface defects and rupture. However, with a more gradual entry into the roll bite, these dangers are greatly reduced and slivers, if they are present, are more likely to pass through the roll bite without defects opening up. Alternatively, it makes it possible for a given mill to roll a thicker slab than would otherwise be possible without exceeding the permissible angle of entry of the rolls into the roll bite.
  • FIG. 2 is an elevational view with parts in section looking along the passline of the structure shown in FIG. 1.
  • FIG. 3 is a cross sectional view on a greatly enlarged scale and broken through the middle to conserve space showing at the bottom the path of a work roll and show-- ing at the top the path of a roll diametrically opposite the particular work roll and in engagement with a cam.
  • FIG. 4 shows guide means according to the prior art, in a somewhat diagrammatic manner.
  • the backing rolls 5 and 5 would be subject to deflection by the roll separating forces and would thus produce a strip which was thicker than the roll gap had been set for, had they not been, in turn, bodied by rigid beams.
  • the beam backed cams 8 and 8 instead of backing beams there are provided the beam backed cams 8 and 8. From their locations, it will be observed that the cams 8 and 8 respectively are diametrically opposite the roll bite of the mill so that pairs of diametrically opposed work rolls are disposed with one in the roll bite and the other bearing against the cam. The extent of the cams 8 and 8' around the work rolls is generally equivalent to the distance from when a work roll enters the roll bite to the point where it leaves the finished strip.
  • a work roll is shown at 6a as it first engages the slab at the beginning of the roll bite. Its diametrically opposite work roll 6a is at the same time in contact with the cam 8. At 6b the work roll is shown as it leaves contact with the finished strip 1' while its diametrically opposite work roll 6b is also in contact with the cam 8. It is these two positions at the entrance into and at the exit from the roll bite where useful and important corrections are made by the means provided by the present invention. 'These improvements are distinct and apart from each other.
  • the objective is to reduce the angle at which the orbit of the work roll 6a intersects the surface of the workpiece 1. For hot steel, an entrance angle of 16 is approximately the maximum which is permissible.
  • Various defects result from too large an entrance angle and there-is a tendency of slivers forming on the surface of the-workpiece if the angle of incidence is greater than 169.
  • the part of the path of the work roll 6b where it makes its last contact with the strip 1' should be flat, i.e., parallel to the passline in order to produce flat strip, so that the circular orbit of the work roll at 6b should be straightened out.
  • Suitably shaped inflexible supports are provided for the work rolls which are diametrically opposed to the work rolls which are in the roll bite and according to the present invention these inflexible supports are in the form of beam-backed cams.
  • the cam 8 will reduce or prevent deflection of the backing roll 5 under the influence of roll separating forces
  • the cam can also be utilized to force the work roll 6 which is diametrically opposite the work roll in contact with the cam, and the backing roll 5 out of its non-loaded state in a direction to oppose the roll separating force and thereby roughly double the effect of the correction.
  • deflection of the backing roll 5 either by roll separating forces or by the effects of the cam causes stresses in the backing roll and excessive stresses will cause fatigue in the backing roll. Therefore the deviation produced by the cam must be less than an amount which would cause a deflection sufficient to produce fatigue in the backing roll.
  • the entrance correction i.e., the correction which causes the work roll entering the roll bite at 6a in FIG. 3 to enter at a more acute angle to the passline, is produced by providing a projection 80 in the cam 8. It will be clear that as the work roll 6a moving clockwise in FIG.3 engages the projection 80, it will produce a downward deflection of the backing roll 5 which in turn will cause the work roll 6a entering the roll bite down so that it enters the roll bite at a more acute angle x rather than the angle at which it would enter without such correction which is indicated at y.
  • the slab l is first reduced and fed forward by a pair of feed rolls 2 and 2 and thence through a pair of guide rolls 3 and 3' and a further set of guide rolls 4 and 4 and finally through the roll bite of the planetary assemblies 5 and 5' so as to emerge in the form of the strip 1,
  • the planetary assemblies 5 and 5' consist of backing rolls surrounded by work rolls 6 and 6.
  • the backing rolls run in bearings which are located in chocks 25 and 25 which chocks are slidably mounted against the wall of the housing 10 and adjustable by screwdown means such as the pressure means 27 (FIG. 1).
  • the work rolls 6 and 6 are rotatably mounted in bearings located in cages 26 and 26' which are coaxial with the backing rolls and they are synchronized by means which are not shown.
  • the rigid beams 9 and 9' are connected to or preferably made integral with the housing columns 10 and 10 to further reduce elastic deflection of the beams 9 and 9.
  • the cams 8 and 8 are installed in the beams 9 and 9 with wedges 11 and 11 interposed between the respective beams and cams. By means of these wedges, the position of the cams in relation to the passline may be adjusted by means such as the screws 28 and 28'.
  • FIG. 1 there are shown guide rolls 4 and 4 which are fulcrumed on a common pin 14 which is mounted in the column 10.
  • the position of the rolls 4 and 4' is controlled by means of rods 15 and 15 which are positioned by worm driven nuts 16 and 16' at their far end and engaging levers l7 and 17 which carry the chocks for the rolls 4 and 4.
  • rods 15 and 15 which are positioned by worm driven nuts 16 and 16' at their far end and engaging levers l7 and 17 which carry the chocks for the rolls 4 and 4.
  • the adjustment path of the rolls 4 and 4 is nearly parallel with the path of the planetary rolls so that the rolls 4 and 4' can be placed very close to the roll bite entry.
  • FIG. 1 there are shown guide rolls 4 and 4 which are fulcrumed on a common pin 14 which is mounted in the column 10.
  • the position of the rolls 4 and 4' is controlled by means of rods 15 and 15 which are positioned by worm driven nuts 16 and 16' at their far end and engaging levers l7 and 17
  • 1 also shows a pair of guide rolls 3 and 3' contacting the slab l ahead of the rolls 4 and 4'. While these rolls could be used to stabilize the slab jointly in the same way as the roll 4 and 4, it is preferable to cause them to deflect the slab l slightly so that the thrust to which the slab is subjected will press it against one of the rolls 3 as shown. Once the slab is so deflected, it will continue to press against the roll 3' and the roll 3 may then be withdrawn to the position indicated at 3 and shown in broken lines. This makes it possible to reduce the heat loss by the slab. The light flexing of the slab also insures a better correction of slab that may not have been straight originally.
  • FIG. 1 shows such a mill with the width of the column 10 added to the minimum distance obtainable.
  • This arrangement provides enough space for the installation of additional rapid heating means to restore a part of the heat loss suffered by the slab on its path from the furnace to the planetary roll bite. This is a very important advantage since the heat loss usually amounts to between 100 and 250 F. and imposes the need to overheat the slab in the furnace. This means a longer furnace together with fuel and scale losses.
  • the rapid heating means may be any of the well known means such as induced eddy currents, direct impinging, high temperature burners and the like.
  • the heating means shown in FIG. 1 are high temperature resistors of refractory metals surrounded by quartz tubes 18 and provided with water cooled reflector shields 19 which are preferably made of a reflecting metal such as stainless steel. These protect the slab 1 against radiation losses and also protect the mill parts against heat damage. It may be also mentioned that for reasons of drawing clarity, butting guides have been omitted in FIG. 1.
  • a planetary mill for rolling flat articles comprising a mill housing, at least one backing roll mounted in said housing, and having a number of planetary work rolls orbiting around it, and a cam arranged to contact the major part of the face of the work roll which is diametrically opposite the work roll which is actually in the roll bite, said cam being mounted in a rigid beam secured to said mil] housing, said cam having a surface generally following the circular orbit of the work rolls, but modified gradually out of said orbit by a radial distance less than the deflection which would cause fatigue stresses in said backing roll.
  • a mill according to claim 1 wherein said cam is modified in its last portion, which corresponds to the last portion of the roll bite of the diametrically opposite work roll, to cause said last named work roll during said last portion of the roll bite, to follow a straight line parallel to the passline.
  • a mill according to claim I wherein said cam is modified in its initial portion, which corresponds to the first contact of the diametrically opposite work roll with the workpiece, and up to the point where the roll separating force has reached its full value, to cause said last named work roll to follow a path at a more acute angle to the passline than it would follow without said modification.
  • a mill according to claim 1 wherein two work rolls are in the roll bite simultaneously during at least a part of the cycle, and wherein said cam is modified for two diametrically opposite work rolls in succession, and wherein the distance between succeeding work rolls is substantially less than the length of the roll bite, to avoid interference of the two profile modifications of the cam surface.
  • a mill according to claim 1 wherein non-slidable slab guiding means are provided, said means contacting at least a part of the face of the slab, said guiding means being disposed close to the roll bite entry to insure the exact position of the slab with respect to the passline.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US00295345A 1972-10-05 1972-10-05 Planetary mill for producing scallop-free strip Expired - Lifetime US3789646A (en)

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US29534572A 1972-10-05 1972-10-05

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JP (1) JPS5234265B2 (fr)
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2311601A1 (fr) * 1975-05-21 1976-12-17 Rollcast Sa Procede et dispositif de transformation de brames en feuillards par laminage
US4019358A (en) * 1973-05-10 1977-04-26 Firm Josef Frohling Rolling mill
US4856313A (en) * 1986-01-30 1989-08-15 Nippon Yakin Kogyo Co., Ltd. Method of controlling strip crown in planetary rolling
US4959099A (en) * 1988-01-14 1990-09-25 Ian Wilson Technology Limited Taper rolling of metal
US6086242A (en) * 1998-02-27 2000-07-11 University Of Utah Dual drive planetary mill
CZ306003B6 (cs) * 2014-09-23 2016-06-15 Žďas, A.S. Hydraulická pojistka dolního rovnacího válce kosoúhlé dvouválcové rovnačky

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709934A (en) * 1953-09-18 1955-06-07 Platzer Franz Rolling mill
US2811060A (en) * 1947-07-22 1957-10-29 Tadeusz Sendizimir And Bertha Planetary reducing mills
US2978933A (en) * 1958-03-05 1961-04-11 Sendzimir Tadeusz Beambacked planetary rolling mill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811060A (en) * 1947-07-22 1957-10-29 Tadeusz Sendizimir And Bertha Planetary reducing mills
US2709934A (en) * 1953-09-18 1955-06-07 Platzer Franz Rolling mill
US2978933A (en) * 1958-03-05 1961-04-11 Sendzimir Tadeusz Beambacked planetary rolling mill

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019358A (en) * 1973-05-10 1977-04-26 Firm Josef Frohling Rolling mill
FR2311601A1 (fr) * 1975-05-21 1976-12-17 Rollcast Sa Procede et dispositif de transformation de brames en feuillards par laminage
US4856313A (en) * 1986-01-30 1989-08-15 Nippon Yakin Kogyo Co., Ltd. Method of controlling strip crown in planetary rolling
US4959099A (en) * 1988-01-14 1990-09-25 Ian Wilson Technology Limited Taper rolling of metal
US6086242A (en) * 1998-02-27 2000-07-11 University Of Utah Dual drive planetary mill
CZ306003B6 (cs) * 2014-09-23 2016-06-15 Žďas, A.S. Hydraulická pojistka dolního rovnacího válce kosoúhlé dvouválcové rovnačky

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Publication number Publication date
GB1406003A (en) 1975-09-10
JPS4991941A (fr) 1974-09-03
JPS5234265B2 (fr) 1977-09-02

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