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Publication numberUS3604237 A
Publication typeGrant
Publication dateSep 14, 1971
Filing dateApr 1, 1968
Priority dateApr 3, 1967
Publication numberUS 3604237 A, US 3604237A, US-A-3604237, US3604237 A, US3604237A
InventorsTakao Kawanami, Hiro Mori, Toyokazu Saito
Original AssigneeHiro Mori, Takao Kawanami, Toyokazu Saito
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Work rolls and cooling method thereof
US 3604237 A
Abstract  available in
Images(4)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent Takao Kawanaml No. 13, Azakltanoyama, Oaqanawa, Uenocho, Chlta-gun;

Toyokazu Salto, No. 39, l-chome, Saltushlta-cho Minaml-ku, Nagoya-shl; l-llro Morl, No. 7, Aza-hlgashiyamada, Oazatukljims, Uenocho, all of Aichi-ken,

[ 72] Inventors Japan [21] Appl. No. 717,611 [22] Filed Apr. 1, 1968 [45] Putente'! Sept. 14, 1971 [32] Priority Feb. 5, 1960. Apr. 3, 1967, Apr. 3, 1967 I 3.1 Japan [31 l 43/7418, 42/2766) and 42/21 101 [54] WORK ROLLS AND COOLING METHOD THEREOF 5 Claims, 7 Drawing Figs.

[52] US. Cl 72/201 [51] Int. Cl l321b 27/06, B21b 27/08 [50] Field ofSearch 29/110,

[56] References Cited UNITED STATES PATENTS 1,536,832 5/1925 l Ivan s... H 165/89 Primary Examiner-Charles W. Lanham Assistant Examiner-E. M. Combs AttarneyMcGlew and Toren ABSTRACT: A method of cooling work rolls in a rolling mill is comprised of forming an axially extending passageway through the work roll and disposing a cooling medium within 1 the passageway for limiting the temperature differences along the surface of the workroll. The cooling medium can be a solid member having a higher rate of thermal conductivity than the material of the work roll or a fluid. The flow path of the fluid cooling medium can be arranged for selectively contacting only certain portions of the roll member within the axi- PATENTEDSEPMIS?! v3.604237 I saw u or 4 INVENTORS fi/ma KANANAM/ Tg yoxnzu 474/10 Min/Mom WORK ROLLS AND COOLING METHOD THEREOF SUMMARY OF THE INVENTION The present invention relates to work rolls and cooling method thereof.

When flat products such as steel .strip oraluminum strip are rolled, work rolls of .a rolling mill are generally given a profile so-called crown" in order to obtain flatness of finished products. However, in case of continuous rolling, temperature differences take place in work rolls along the direction of roll axis so that the rolls are undesirably deformed due to heat.

In other words, the thermal deformation is caused by heat due to friction at bearings of'the work roll, due to plastic deformation work, and heattransmitted from the work piece.

For example, according to the temperature variation of roll observed from actual measurements on the temper rolling mill, the difference between temperature (A) at the middle portion ofthe work roll barrel and temperature (B) at the end portions of the work roll barrel reveals itself to be about C., after continuous rolling of 13 coils of material as shown in the diagram. In general when the temperature difference is over'about 10 C., flatness of rolled products becomes worse, appearance of the finished products becoming unsatisfactory.

The reason is that the reduction percentage by the temper rolling is comparatively low and the temperature at .the end portions of the work roll barrel becomes higher .as compared with the temperature at the middle portion due to heat from work roll bearings by friction. Depending upon the kind of rolling mill, forlexample a .cold reduction mill, the temperature at the middle portion becomeshigher than .at the end portions in which case flatness of rolled products is also undesirably injured.

The present invention is intended to overcome the abovementioned difficulties, andrelates to a'method for cooling .the work rolls and adjusting the temperature thereof which is characterized in that coolingmedium is passedthrough a cooling pipe or pipes inserted spacedly in the central lengthwise hole of the work roll, a method of cooling the work rollsand of adjusting the temperature thereof which is characterized in that cooling medium is passed through a cooling pipeor pipes spacedly inserted in the central lengthwise hole of the work roll, said pipe or pipes having openings or slits and .the like thereon in positions corresponding to a section or sections of the roll to be cooled to partially cool the roll or to cool one section or sections of the work roll more than the remaining sections and a method of adjusting the temperature .of the work roll which is characterized in that a heat-conducting medium is inserted in the central lengthwise hole of the work roll to contact partially or wholly with the wall of'said central hole and further relates toa work roll, characterized in that in order to prevent thermal deformation of the roll, the difference between temperatures at various portions of the roll is kept below about 10C., and a central lengthwise hole is provided through thecentral portionof the roll, and in the hole, inlet and outlet .pipes for example, for passing cooling medium are provided by means of rotary joints, and further relates to a work roll, characterized in that in order to prevent thermal deformation of the roll, the difference between temperatures at various portions-of the roll is kept below about 10 C., and at the central portion of the roll, a central lengthwise hole is provided, in which hole, there is inserted a heat-conducting medium in partial or whole contact with the wall of the hole.

Additionally, the present invention relates to a joint device for connecting the rotary joint with the end of the to neck, which comprises .a flange fixed on the end of the roll neck, a cylindrical member, said flange having partially screwed inside wall and said cylindrical member having partially screwed outside surface, whereby said cylindrical member is easily mounted or dismounted only by turning the cylindrical member.

For example, along the axial direction of the roll there is provided a central lengthwise hole, in which hole a supply pipe of cooling medium extending from one end of the roll to the other is providedywhich pipe is'supplied with cooling medium in such a manner that the cooling'medium coming out at the end of the supply pipe cools the roll, while flowing through the space between the supply pipe and the roll, to be discharged at the rotary joint equipped with .a discharge pipe. in principle :the cooling medium can be flowed in reverse: through the space then through the pipe. In this case, it may be also so provided that, as mentioned above, the roll is cooled by cooling medium flowing from the end of the supply pipe through the space between the supply pipe and the roll, or so provided that, for example, a number of holes are provided on the supplypipe in such a manner that the cooling fluid is jetted out through the holes.

Thus, when the temperature in a section or sections of the roll becomes higher than that of other sections of the I'OllyIhIS high-temperature section or sections can be separately cooled so .that the temperature difference in the roll is kept below about 10 C.

For example, a supply pipe or pipes coaxially or in parallel are placed in the central lengthwise hole in such a position that the coolingmedium comes out from the pipe to the space between the pipe and the roll at the position corresponding to the "higher temperature section or sections of the roll, and then the cooling medium is led in'the discharge pipe after cooling, gathered altogether at the rotary joint part, and discharged from-the discharge pipeprovided on therotary joint.

Further, for'example, a supply pipe for coolingfluid is provided extending from one end of the roll to the other end in such manner :that, .as mentioned'above, holes are provided so as to be able to supply the cooling medium to the positions of higher temperature. The size of each of these holes are so determined that the supply quantity of cooling medium is controlled according to the temperature difference in order to keep the temperature difference in the roll not higher than about i 0 C.

The cooling medium after cooling may be either thrown away or circulated by providing a separate cooling equipment.

As the cooling medium, for example, water, air or the like may be utilized.

As the sealing between the rotary joint and the roll, an adequate sealing mechanism such as hearing or the like is utilized.v

Apart from the utilization of the above-mentioned cooling medium, in case, for example, the difference between temperatures at the middle portion of'the roll and at the end portions of the roll is above about 10 C., along the axialdirection of the roll there-is provided a central lengthwise hole, in which hole a heat-conducting medium is inserted. The heat conducting medium inserted is so designed as to be broughtin whole contact with the inside wall of the roll, or partial contact with it at the positions having temperature difference to equalize the temperature through the roll barrel. For example, the heat-conducting medium is so designed that it contacts with the inside wall of the central lengthwise hole at the positions corresponding to the end .portionsof the work roll barrel having higher temperature and to the middle portion having lower temperature in order to give thermal connection between these portions, and the remaining positions of the heat-conducting medium has a smaller diameter so that these portions do not contact with the roll.

Thus, the heat at the end portions of the roll barrel are thermally connected through the heat-conducting medium to the middle portion having lower temperature of the roll, so that the temperature difference becomes remarkably small with the result that the thermal deformation due to the temperature difference may be prevented effectively.

As mentioned above, the heat-conducting medium is provided in such a manner that it comes in contact with higher temperature portions and the lower temperature portions of the roll and does not'contact the other part of the roll; namely the roll and the heat-conducting medium contact with each other-at certain portions and does not contact at the remaining portions and it is quite effective to fill up the spaces formed around the noncontacted portions, where the roll and the heat conductor are not in contact with each other, i.e. the spaces between the roll and the heat-conducting medium with heat insulation material such as rock wool or the like in order to prevent another temperature difference, by preventing the conduction of heat from the portion having higher temperature to the portion having intermediate temperature between said higher and lower temperatures.

As the heat-conducting medium, a material such as copper, aluminum or the like, which has higher heat conductivity than the material of the roll can be utilized.

The advantages, which may be obtained by utilizing the roll according to the present invention, are as follows.

The thermal deformation due to the temperature difference in the work roll may be almost avoided, so that the yield of rolled products may be remarkably increased.

Further, the frequency of roll exchange is decreased so that the delay time of the rolling mill can be remarkably reduced as well as the productivity can be greatly improved.

Further advantages of the present invention are seen in the facts that, the work for exchanging the rolls is decreased due to the diminution of the roll exchange frequency, as well as it becomes unnecessary to prepare so many rolls for exchanges as usual, and the work for roll repair may be greatly eliminated.

and so on.

The present invention will be explained in detail referring to the attached drawings. I

FIG. 1 is an explanatory diagram of the temperature variation in the work roll of a temper rolling mill.

FIG. 2 is an explanatory drawing of an embodiment of the present invention in which cooling medium passage is provided by a pipe spacedly extending in the central lengthwise hole of the roll.

FIG. 3 is an explanatory drawing of another embodiment of the present invention in which cooling medium passage is provided by a pipe having holes and extending in the central lengthwise hole of the roll.

FIG. 4 is an explanatory drawing of another embodiment of the present invention in which cooling medium passage is provided by inlet and outlet pipes extending in the central lengthwise hole of the roll.

FIG. 5 is an explanatory drawing of another modified embodiment of the present invention in which a heat-conducting medium is inserted in the central lengthwise hole of the roll.

FIG. 6 is a sectional view of the joint device for connecting the rotary joint with the end of the roll neck according to the present invention.

FIG. 7 is a cross-sectional view along the line A-A of FIG.

EXAMPLE 1 In FIG. 2 a central lengthwise hole 22, is provided in the work roll 21 of a temper rolling mill, and a water supply pipe 23 is placed in the central hole 22 by means of rotary joint 24. Sealing of the rotary joint 24 and the end portions of the work roll 21 is done by a bearing seal 26 using a sleeve 27. A discharge pipe 28 is provided in the rotary joint 24.

Cooling water is supplied by the water supply pipe 23 and jetted from the end of the supply pipe 23 to cool the one higher temperature end portion 25' of the roll and passes through the space between the water supply pipe 23 and the work roll 21 to cool the other end portion 25 of the roll. The water passes to the rotary joint 24 and is discharged from the discharge pipe 28. I, I 7

Almost no temperature difference; between the higher temperature end portions 25, 25 and the lower temperature, and no deformation of theroll crown due to the thermal deformation was observed middle portionof the roll in the after a continuous rolling of 10 coils with the work rolls cooled in this way.

EXAMPLE 2 In FIG. 3 a central lengthwise hole 22 is provided in the work roll 21 of a temper rollingrnill, and a water supply pipe 23 having holes 29 at the positions corresponding to the higher temperature end portions 25, 25' of the roll 21 is placed in the central hole 22 by means of a rotary joint' 24.

Sealing of the rotary joint 24 and the end portions of the roll 21 is done by a bearing seal 26 using a sleeve 27. A discharge pipe 28 is provided in the rotary joint 24.

Cooling water is supplied by the supply pipe 23Iand jetted from the holes 29 provided in the pipe at the positions corresponding to the end portions of the roll to cool these higher temperature portions, and passes through the space between the pipe 23 and the wall of the central hole of the roll to the rotary joint 24 and is discharged from the discharge pipe 28.

Almost no temperature difference between the higher temperature end portions 25, 25' and the lower temperature middle portion of the roll was observed and no deformation of the roll crown due to the thermal deformation was observed after a continuous rolling of 12 coils with the work rolls cooled in this way.

EXAMPLE 3 In FIG. 4, a central lengthwise hole 2 is provided, in the work roll 1 of a temper rolling mill while a water supply pipe 3 is provided thereon, extending near an end portion 5 of the roll by means of a rotary joint 4.

The water supply pipe 3 is equipped with holes 6 at the positions corresponding to the end portion 5, while a discharge pipe 7 is installed inside of the water supply pipe 3. The discharge pipe 7 is provided with holes 8 at the position corresponding to the middle portion of the roll so that the water coming out from the pipe contacts with the roll.

At the lower end of the rotary joint, a discharge pipe 9 is provided. A bearing 1 1 equipped with sealing means serves for the sealing the joint using a sleeve 10.

Cooling water reaches the neck portion 5 of the roll through i the holes 6 of the water supply pipe 3, and cools the end portions 5. Then the cooling water is cut off by walls 12a dividing cooling sections and led out at the discharge pipe a through the rotary joint.

On the other hand cooling water further flows through the water supply pipe 3, and is discharged at the end thereof and there, cools the other end portion 5 of the roll. Then the cooling water is cut off by walls 12b led into the discharge pipe 7, and is brought in contactwith the roll 1 through the holes 8 of the discharge pipe 7 at the position corresponding to the lower temperature middle portion of the roll. In this way, since the cooling water, which has cooled the end portion 5' absorbing heat therefrom, comes in contact with the lower temperature middle portion of the roll, the difference between the temperatures at the end portions 5, 5 and the temperature at the middle portion of the roll becomes extremely small.

Then, the cooling water which has been brought in contact with the lower temperature middle portion of the roll is led out from the discharge pipe 9 through the holes 8, the discharge pipe 7 and the rotary joint 4.

The wall 12c is installed in order to prevent the cooling water from flowing into sections where the temperature difference in almost out of question. The roll 1 rotates together with the sleeve 10.

The walls 12a 12b, 12c are fixed on the water supply pipe 3, and an elastic material such as rubber not shown is provided at contact points of the walls 12a, 12b, 12c with the roll 1.

Thirteen coils of material were rolled with above-mentioned rolls with the total rolling time of 75 minutes, and it was found that there was almost no difference between the temperatures at theend portions 5, 5' and the temperature at the middle portion of the roll, and any thermal deformation was not observed.

EXAMPLE 4 1 ln FIG. 5, at the central portion of the roll 5 of a temper rolling mill, a central lengthwise hole 2 is provided extending from one end of the roll to the other end, and a heat-conducting medium made of copper is inserted in the hole 2 in such a manner that the heat conducting medium comes in contact with the higher temperature end portions 5, 5' of the roll 1 and the lower temperature middle portion of the roll 1, but does not contact the other portions of the roll, forming spaces 14 there between, as shown in the drawing.

Fifteen coils of material were rolled using the above mentioned rolls 1 with the rolling time of 84 minutes, and it was found that the difference between the temperatures at the end portions and the temperature at the middle portion was only a little, say 3 C. and any deformation of crown due to the thermal deformation was not observed.

Now the novel jointing device for connecting the rotary joint with the end of the work roll shall be described referring to FIG. 6 and H6. 7.

A flange 62 is attached on the end portion 61 of the roll R by means of bolts 64 with packing 63 therebetween. On the inside wall of the flange, screw threads 66 are formed at three portions equally spaced from each other, into which a rotary cylindrical member 65 is screwed and set by means of screw threads formed at three portions equally spaced from each other on the outside of the cylindrical member. The screw threads on the inside wall of the flange 62 and on the cylindrical member 65 are designed in such a manner that the cylindrical member 65 is screwed in the flange by turning the cylindrical member in the rotating direction of the roll so as to prevent the cylindrical member from being screwed out from the flange by the rotation of the roll.

For setting the cylindrical member in the flange, the screw thread portions of the cylindrical member are mated with the grooves 68 on the inside wall of the flange and the cylindrical member is inserted in the flange operating the handle 67 attached to the cylindrical member 65. And the cylindrical member is turned to set the screw threads of the cylindrical member with the screw threads 66 of the flange 62 by turning the handle 67.

For disengagement, the cylindrical member is turned 60 in reverse direction to mate the screw threads of the cylindrical member 65 with the grooves 68 of the flange 62 and then the cylindrical member is drawn out from the flange.

In the drawings, 69 is a small flange having an O-ring packing 610 and attached to the cylindrical member 65.

This flange is engaged water tight with the flange to prevent the leakage of cooling water.

The cooling water from the rotary joint flows through the water supply pipe 611 into the end portion and the inner portions of the roll and passes through the space 612 between the cylindrical member and the water supply pipe and is discharged outside the roll through the rotary joint.

By the above design, the rotary joint is easily and promptly mounted or dismounted, and a very firm connection can be assured without threat of leakage of the cooling medium, and the supplyof cooling medium into the work roll can be effectively done, thus saving much of the labor and time required by the connecting work, and increasing the productivity of the rolling mill.

We claim:

I. A work roll for use in a temper rolling mill for rolling steel sheet material and the like comprising an axially extending cylindrically shaped member having a pair of axially spaced circumferentially extending end parts arranged to be positioned in frictional engagement within work roll bearings and a circumferentially extending intermediate part disposed between said end parts and arranged to contact the steel sheet material passing over the work roll, said member having a bore extending in the axial direction therethrough from one said end part to the other said end part, the bore in said member being closed at one end within the other said end part and extending for substantially the entire axial length of said member from one said end part to the other said end part, conduit means for conveying a cooling fluid through said bore and out of contact relationship with the surface of said bore and for discharging the cooling fluid into said bore into direct contact with the material forming said member which contacts the steel sheet material for maintaining the temperature of the surface portions of said member within a range of about 10 C., said conduit means comprising a first conduit extending through and centrally positioned within said bore in spaced relationship with the surface of said bore for forming an annular space therebetween for supplying a cooling fluid from said first conduit into the annular space for passage over the surfaces of said member within said bore so that the cooling fluid is in direct contact with the material of said member which contacts the steel sheet material passing over the work roll, and a second conduit coaxially arranged within and spaced inwardly from said first conduit forming an annular space therebetween, said second conduit having a first end and a second end, the first end of said second conduit located within the bore spaced outwardly from the end of said first conduit adjacent to closed end of the bore, and the second end of the said second conduit disposed outwardly from said bore whereby cooling medium flows into the bore through said first conduit and after its passage therethrough to the closed end of the bore is admitted into said second conduit for passage therethrough and eventual discharge from said member.

2. A work roll, as set forth in claim 1, :wherein transversely arranged pipe sections are secured to and are in communication with the interior surface of said second conduit at one end and extend through the annular space between said second conduit and said first conduit and are secured at the other end into said first conduit for circulating cooling fluid between said second conduit and the annular space located between said first conduit and the surface of said bore.

3. A work roll as set forth in claim 2, wherein a plurality of transversely arranged annular-shaped plates are disposed between the outer surface of said first conduit and the surface of said bore at spaced positions therealong for forming a plurality of separated circumferentially extending compartments in the annular space.

4. A work roll for use in a temper rolling mill for rolling steel sheet material and the like comprising a longitudinally extending cylindrically shaped member having an axially elongated circumferentially extending intermediate portion arranged to contact the steel sheet material and a pair of circumferentially extending end portions on opposite sides of said intermediate portion and arranged to be positioned in frictional engagement with work roll bearings, said member having a bore extending axially therethrough and closed at one said end portion of said member, a conduit for supplying cooling fluid into said bore and disposed centrally therein and extending therethrough in spaced relationship with the surface of the bore for forming an annular space therebetween, said conduit having one end located exteriorally of the bore and the other end located adjacent to and spaced from the closed end of the bore, a joint member secured to said member at the open end of the bore therethrough, said joint member comprising an annular shaped flange disposed about the open end of said bore and secured to one of said end portions of said member, a

" cylindrical member arranged to be selectively disposed in threaded engagement with the inner surface of the opening in said flange, said cylindrical ,member spaced outwardly from said conduit and forming an annular space therewith for receiving the cooling fluid flowing outwardly from the annular space in the bore about said conduit, and means for forming a seal between said flange and said cylindrical member to prevent leakage therebetween of the cooling medium flowing within the annular space in said bore.

5. A wall member, as set forth in claim 4, wherein said flange having spaced circumferentially extending threaded sections on the inner surface within its opening, said cylindrical member having similarly arranged spaced threaded sections on its exterior surface for engagement with the threaded sections on said flange, so that by positioning said threaded sections on said cylindrical member between the threaded sec-

Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3789882 *Aug 25, 1972Feb 5, 1974United States Steel CorpDischarge collector for fluid cooled roll
US4041742 *Jan 15, 1976Aug 16, 1977Kelsey-Hayes CompanyApparatus and method for cold working metal powder
US4137963 *Sep 12, 1977Feb 6, 1979Vereinigte Osterreichische Eisen- Und Stahlwerke - Alpine Montan AktiengesellschaftStrand guiding roller to be used in a continuous casting plant
US4173880 *Apr 6, 1978Nov 13, 1979Mannesmann AktiengesellschaftCooled mandrel
US4378686 *Mar 6, 1978Apr 5, 1983United Kingdom Atomic Energy AuthorityForming of materials by extrusion
US4440214 *May 30, 1980Apr 3, 1984Beloit CorporationHeat transfer roll and method
US4481715 *Feb 4, 1983Nov 13, 1984Gilmore David LFor measuring a dimension of an elevated temperature surface
US4793172 *Oct 13, 1987Dec 27, 1988Italimpianti Of America IncorporatedThermal crown controlled rolls
US5313813 *Sep 25, 1992May 24, 1994Sms Schloemann-Siemag AktiengesellschaftUpsetting press for reducing the width of rollng stock with internally cooled retaining rolls and driver rolls
US7874192 *Apr 16, 2003Jan 25, 2011Bartlett Engineering (South Wales) LimitedArrangement for cooling a roll
Classifications
U.S. Classification72/201, 165/89
International ClassificationB21B27/08
Cooperative ClassificationB21B27/08
European ClassificationB21B27/08