CA1068945A - Cooling of a roll in a roll stand - Google Patents
Cooling of a roll in a roll standInfo
- Publication number
- CA1068945A CA1068945A CA280,285A CA280285A CA1068945A CA 1068945 A CA1068945 A CA 1068945A CA 280285 A CA280285 A CA 280285A CA 1068945 A CA1068945 A CA 1068945A
- Authority
- CA
- Canada
- Prior art keywords
- roll
- rolls
- stand
- nozzle
- roll stand
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Nozzles (AREA)
- Control Of Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A coolant liquid, e.g. water, is atomized by a compressed gas, e.g. air. The mixture is formed into a jet directed against a portion of the surface of one roll of a pair of rolls in a roll stand. This portion is on the exit side of the stand and faces the other roll.
A coolant liquid, e.g. water, is atomized by a compressed gas, e.g. air. The mixture is formed into a jet directed against a portion of the surface of one roll of a pair of rolls in a roll stand. This portion is on the exit side of the stand and faces the other roll.
Description
~(~6~9~5 ~he pre~ant invention relates to a roll stand and to a method o~ cooling a roll, which can be applied in particular (but not solaly) in the case where one has to deal with grooved rolls, ~or example in rolling wire rod, such a~ ~teel wire rod.
~he rolling of metal product~, such as strip, b&r and wire rod, re~ults in the generation o~ large amounts of - heat tending to raise the temperature of the roll~ ~etween ~ which the products are rolled~ ~he re~ulting increase in ; 10 temperature adversely affects the performance o~ the rolls` from several view point~, amon~ which the foliowing ~houldbe mentioned: deterioration of the mecha~ical properties at the ~ur~ace of the roll (~ubstantially due to the te~perature le~el reached, and rapid wear of the rolls (due to large temperature gradi~nts).
. Thus, in order to be able to continue rolling, it isimportant to cool the rolls so th~t, in operation, heating - is ~ept within limits compatible with standard operation without unacceptable deterioration.
~ 20 ~o thi~ end, it has alread~ been suggested to use - ~ de~ice~ which can be applied to rod rolling mills and i~ which the upper part of the upper roll of th~ roll ~tand prayed with a coolant liquid which flows alon~ and around ~- .the rolled product and i5 allowed to run down ~ha sur~ace of the lower roll or rolls. In this way all the roll~ of a stan~ are cooled b~ maan~ o~ a single eooling liouid supply, but this device ha~ the di~adva~tage of permitting o~ly unevsn and wro~gly localised coolsn~ of the roll~, which ... . . .. ..
1C~6894~5 cannot be considered as an effective solution of the a~ove~mentioned problem, i~ particular from the point of view of a sufficient and uniform decrease in the temperature gradient.
In order to decrease the temperature gradient, it ha3 already been suggested to direct wa~er ag~inst the rolls i~ a zone a~ close as po~sible to the contact a~eas between the rolls ~nd the product. To this end, use wa~
made of æimple noz~les.or conduits, which resulted in a ~ery poor e~ficiency, a large amount of water being nece6sary. Moreover, positioning the noæzles waæ a ferent task in the case o~ grooved rolls, owing to the t :~. -presence of guide rollers for the product between one t groo~e and the other.
~he pres~nt invention provides a method of cooling a roll in a roll stand ha~ing two rotating rQlls between ! which a product is to be rolled, com~rising the steps of j ~omi~ing a coolant liquid by means of a compressed gas, formi~g the resulting mi~ture o~ gas and atomized liquid 20- into a Jet, and dire~ting the jet Pgainst a portion of the surface o~ one of the ~aid rolls, the said ~ur~ace portion being on the exit side of the ~tand and ~acing the other of the ~aid roll~n The higher the æpeed of the aet, the better is the eooling effect. Pre~erably, the mixtur~ is ~ormed into a ~et by passing it through a ~val tube~ The jet should strike the roll a~ clo~e a~ possible to the contact zone between the roll and the product.
. - 2 10~8945 It is preferable for the jet to have a velocity component directed in a dixection opt~osi~e to the direction of rotation of the roll, which enhances the intimacy of contact between the mixture and the roll and, thu~, the intensit~ of the cooling effect.
In the case where the method ia applied to a stand having grooved rolls9 the dimensions of the jek are Ipreferably cho~en su~h that the surface portion against - which the jet is directed occupies at lea~t the major part ~0 o~ the width, preferabl~ the entire width, of the groove in the said roll~ The dimension~ ~f the jet can be adjusted by controllin~ the pressure of the compres~ed gas (e.g. air) used fo~ atomi~ing the coola~t li~uid (e.g. water).
~he invention also pro~ide~ a roll stand compri~i~g two rotatable roll~ between which a pxoduct is to be rolled, and a ~et-forming nozzle havin~ ~n axi8 directed towards a . portion o~ the surface of one of the said rolls, the said ~urface portion being on the exit side of tha stand and facing the other o~ the ~.aid rolls, the nozzle havi~g a substantially conical bore diverging towards an ou~let and a conduit opening.into the outlet end o~ the bore, means for ~upplying compresaed gas to the bore, and means for ~upplying coolant liquid to the conduit, whereby the coolant liguid is atomized by the compressed ~
~he apparatu~ preferably comprises a series of nozzles di~posed sub tantially in the s~me plane trans~erse to- the xotation axis of the roll.
~068~45 . .
According to a fir~t embodiment, the a~e~, of the ; nozzles ~re arra~ged in a fan configuration~ i.e~ they diverge towards the roll. According to a second embodiment they are axranged substantially parallel to one another, the outl0t~ of the nozzle~ being mutually ~taggered ~tep-wise one behind another, i.e. in the direc~io~ of the eaid axe~.
Preferably, the nozzles of the ~eries are co~nected ; to one another and ~ixed to a guide through which the ; 10 rolled product pa~ while emerging from between the roll~.
hi8 makes it pos~ible, on the one hand, to orie~tatc the ~ , nozzles accurately relative to one ~nother so that, for i example, they e~fecti~ely spray a given groove and, on the .
other ha~d, to displace them togethex with the guide, for 15 example for passing from one groove to another in the case j where each roll ha~, more th~n one groove.
~he in~ention will be described further, by way o~
e~ample o~ly, with re~erence to the accompanyi~g drawing3, i~ which:-Figure 1 is a diagrammatic ~^ross-section of paxt of ~he exit side o~ a roll ~tand; and ;~ ~ Figure 2 i~ a similar ~riew of arLother roll stalld.
In the xoll ~tand illustrated i~ Figure 1 there are two g~ooved rolls 1 and 2, the cross-section being taken at 25 ~he position o~ a groo~e in each rollO ~he two rolls aa>e rotated in the directions indicated by arrows 3 and 4 by a mill drive (~ot show~ guide 5 ha~ its axis 6 directed ., , .
, ........
... ., . , .~ . .. ... . .. . . .
- 1~6894S
along the grooves in ~uestio~ a~d is ~or~ed with a bore 7 thxough which rolled product can pass as it emerges from between the rolls 1~2.
~he roll stand has a cooling device comprisi~g two series each of three no~zles 8 to 10 ~nd 11 to 13 having their axe~ di~erging in a fan configuration i~ the same plan0 perpendicular to the axes of the rolls and inter-secti~g the middle of each groo~e in question~ Compressed air flows through substantially conically divergent bores 14, of the nozzles whereas coolant water is ~upplied through ` a common conduit 15 opening into the outlet end~ of the bores 14 where it i~ ~tomized by the compressed air ~nd emerges through ~aval tubes as jets. ~n assembl~ of each . . serie~ i8 mounted rigid with the ~uide 5 by the intermediar~
. 15 of a pla~ 16. ~ach je~ i~ directed against a sur~ace portion i of the respective roll on ~he exit side o$ the stand and ` faci~ the other roll. ~he jets nearest the axi~ 6 have a .
velocity component directed oppositely to the direction o~
rotation o~ the respective rollæ.
Figure 2 ~hows a variant of the cooling device shown in Figure 1, each series of nozzles in this case comprising - ~wo no~zle~ whose axes are parallel and whose outlets are ! . ~taggered one behind the other. ~he remaining feature5 are the same as in Fi~e 1.
~he rolling of metal product~, such as strip, b&r and wire rod, re~ults in the generation o~ large amounts of - heat tending to raise the temperature of the roll~ ~etween ~ which the products are rolled~ ~he re~ulting increase in ; 10 temperature adversely affects the performance o~ the rolls` from several view point~, amon~ which the foliowing ~houldbe mentioned: deterioration of the mecha~ical properties at the ~ur~ace of the roll (~ubstantially due to the te~perature le~el reached, and rapid wear of the rolls (due to large temperature gradi~nts).
. Thus, in order to be able to continue rolling, it isimportant to cool the rolls so th~t, in operation, heating - is ~ept within limits compatible with standard operation without unacceptable deterioration.
~ 20 ~o thi~ end, it has alread~ been suggested to use - ~ de~ice~ which can be applied to rod rolling mills and i~ which the upper part of the upper roll of th~ roll ~tand prayed with a coolant liquid which flows alon~ and around ~- .the rolled product and i5 allowed to run down ~ha sur~ace of the lower roll or rolls. In this way all the roll~ of a stan~ are cooled b~ maan~ o~ a single eooling liouid supply, but this device ha~ the di~adva~tage of permitting o~ly unevsn and wro~gly localised coolsn~ of the roll~, which ... . . .. ..
1C~6894~5 cannot be considered as an effective solution of the a~ove~mentioned problem, i~ particular from the point of view of a sufficient and uniform decrease in the temperature gradient.
In order to decrease the temperature gradient, it ha3 already been suggested to direct wa~er ag~inst the rolls i~ a zone a~ close as po~sible to the contact a~eas between the rolls ~nd the product. To this end, use wa~
made of æimple noz~les.or conduits, which resulted in a ~ery poor e~ficiency, a large amount of water being nece6sary. Moreover, positioning the noæzles waæ a ferent task in the case o~ grooved rolls, owing to the t :~. -presence of guide rollers for the product between one t groo~e and the other.
~he pres~nt invention provides a method of cooling a roll in a roll stand ha~ing two rotating rQlls between ! which a product is to be rolled, com~rising the steps of j ~omi~ing a coolant liquid by means of a compressed gas, formi~g the resulting mi~ture o~ gas and atomized liquid 20- into a Jet, and dire~ting the jet Pgainst a portion of the surface o~ one of the ~aid rolls, the said ~ur~ace portion being on the exit side of the ~tand and ~acing the other of the ~aid roll~n The higher the æpeed of the aet, the better is the eooling effect. Pre~erably, the mixtur~ is ~ormed into a ~et by passing it through a ~val tube~ The jet should strike the roll a~ clo~e a~ possible to the contact zone between the roll and the product.
. - 2 10~8945 It is preferable for the jet to have a velocity component directed in a dixection opt~osi~e to the direction of rotation of the roll, which enhances the intimacy of contact between the mixture and the roll and, thu~, the intensit~ of the cooling effect.
In the case where the method ia applied to a stand having grooved rolls9 the dimensions of the jek are Ipreferably cho~en su~h that the surface portion against - which the jet is directed occupies at lea~t the major part ~0 o~ the width, preferabl~ the entire width, of the groove in the said roll~ The dimension~ ~f the jet can be adjusted by controllin~ the pressure of the compres~ed gas (e.g. air) used fo~ atomi~ing the coola~t li~uid (e.g. water).
~he invention also pro~ide~ a roll stand compri~i~g two rotatable roll~ between which a pxoduct is to be rolled, and a ~et-forming nozzle havin~ ~n axi8 directed towards a . portion o~ the surface of one of the said rolls, the said ~urface portion being on the exit side of tha stand and facing the other o~ the ~.aid rolls, the nozzle havi~g a substantially conical bore diverging towards an ou~let and a conduit opening.into the outlet end o~ the bore, means for ~upplying compresaed gas to the bore, and means for ~upplying coolant liquid to the conduit, whereby the coolant liguid is atomized by the compressed ~
~he apparatu~ preferably comprises a series of nozzles di~posed sub tantially in the s~me plane trans~erse to- the xotation axis of the roll.
~068~45 . .
According to a fir~t embodiment, the a~e~, of the ; nozzles ~re arra~ged in a fan configuration~ i.e~ they diverge towards the roll. According to a second embodiment they are axranged substantially parallel to one another, the outl0t~ of the nozzle~ being mutually ~taggered ~tep-wise one behind another, i.e. in the direc~io~ of the eaid axe~.
Preferably, the nozzles of the ~eries are co~nected ; to one another and ~ixed to a guide through which the ; 10 rolled product pa~ while emerging from between the roll~.
hi8 makes it pos~ible, on the one hand, to orie~tatc the ~ , nozzles accurately relative to one ~nother so that, for i example, they e~fecti~ely spray a given groove and, on the .
other ha~d, to displace them togethex with the guide, for 15 example for passing from one groove to another in the case j where each roll ha~, more th~n one groove.
~he in~ention will be described further, by way o~
e~ample o~ly, with re~erence to the accompanyi~g drawing3, i~ which:-Figure 1 is a diagrammatic ~^ross-section of paxt of ~he exit side o~ a roll ~tand; and ;~ ~ Figure 2 i~ a similar ~riew of arLother roll stalld.
In the xoll ~tand illustrated i~ Figure 1 there are two g~ooved rolls 1 and 2, the cross-section being taken at 25 ~he position o~ a groo~e in each rollO ~he two rolls aa>e rotated in the directions indicated by arrows 3 and 4 by a mill drive (~ot show~ guide 5 ha~ its axis 6 directed ., , .
, ........
... ., . , .~ . .. ... . .. . . .
- 1~6894S
along the grooves in ~uestio~ a~d is ~or~ed with a bore 7 thxough which rolled product can pass as it emerges from between the rolls 1~2.
~he roll stand has a cooling device comprisi~g two series each of three no~zles 8 to 10 ~nd 11 to 13 having their axe~ di~erging in a fan configuration i~ the same plan0 perpendicular to the axes of the rolls and inter-secti~g the middle of each groo~e in question~ Compressed air flows through substantially conically divergent bores 14, of the nozzles whereas coolant water is ~upplied through ` a common conduit 15 opening into the outlet end~ of the bores 14 where it i~ ~tomized by the compressed air ~nd emerges through ~aval tubes as jets. ~n assembl~ of each . . serie~ i8 mounted rigid with the ~uide 5 by the intermediar~
. 15 of a pla~ 16. ~ach je~ i~ directed against a sur~ace portion i of the respective roll on ~he exit side o$ the stand and ` faci~ the other roll. ~he jets nearest the axi~ 6 have a .
velocity component directed oppositely to the direction o~
rotation o~ the respective rollæ.
Figure 2 ~hows a variant of the cooling device shown in Figure 1, each series of nozzles in this case comprising - ~wo no~zle~ whose axes are parallel and whose outlets are ! . ~taggered one behind the other. ~he remaining feature5 are the same as in Fi~e 1.
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of cooling a roll in a roll stand having two rotating rolls between which a product is to be rolled, comprising the steps of atomizing cooling water by means of a compressed gas, forming the resulting mixture of gas and atomized water into a jet by passing it through a Laval tube, the com-pressed gas being introduced through the inlet end of the con-verging section of the Laval tube while water is laterally introduced into the compressed gas near the outlet end of the diverging section of the Laval tube at an angle to the longitu-dinal axis of the Laval tube, and directing the jet at high speed against a portion of the surface of one of the said rolls, the said surface portion being on the exit side of the stand and facing the other of the said rolls, the outlet end of the Laval tube being as close as possible to said surface portion.
2. A method as claimed in claim 1, in which the jet has a velocity component directed oppositely to the direction of rotation of the said one roll.
3. A method as claimed in claim 1, each roll having a circumferential groove, in which the said surface portion occupies at least the major part of the width of the groove of the said one roll.
4. A method as claimed in claim 1, comprising direct-ing more than one said jet against more than one said portion of at least one of the said rolls.
5. A roll stand comprising two rotatable rolls between which a product is to be rolled, and a jet-forming nozzle having an axis directed towards a portion of the surface of one of the said rolls, the said surface portion being on the exit side of the stand and facing the other of the said rolls, the nozzle having a substantially conical bore diverging towards an outlet comprising a Laval tube and a conduit opening into the outlet end of the bore, means for supplying compressed gas to the bore, and means for supplying coolant water to the conduit, whereby the coolant water is atomized by the compressed gas.
6. A roll stand as claimed in claim 5, in which said roll has a circumferential groove and the axis of the nozzle intersects the groove of the said one roll.
7, A roll stand as claimed in claim 5, comprising more than one said nozzle having their axes directed towards more than one said surface portion of the said one roll.
8. A roll stand as claimed in claim 7, in which the axes of the nozzles lie in a single plane transverse to the axis of rotation of the said one roll.
9, A roll stand as claimed in claim 8, in which the nozzle axes diverge from one another towards the said one roll.
10. A roll stand as claimed in claim 8, in which the nozzle axes are substantially parallel to one another and the outlets are staggered stepwise one behind another.
11. A roll stand as claimed in claim 7, further com-prising a guide through which the product passes while emerging from between the rolls, the nozzles being connected together and fixed to the guide.
12. A roll stand as claimed in claim 5, comprising a plurality of said nozzles having their axes directed towards a plurality of said surface portions on both the said rolls.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE6045554A BE842903A (en) | 1976-06-11 | 1976-06-11 | PROCEDURE AND DEVICE FOR COOLING SPLINED CYLINDERS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1068945A true CA1068945A (en) | 1980-01-01 |
Family
ID=3874690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA280,285A Expired CA1068945A (en) | 1976-06-11 | 1977-06-10 | Cooling of a roll in a roll stand |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS52152854A (en) |
| BE (1) | BE842903A (en) |
| CA (1) | CA1068945A (en) |
| DE (1) | DE2725375A1 (en) |
| FR (1) | FR2354153A1 (en) |
| GB (1) | GB1559632A (en) |
| LU (1) | LU77521A1 (en) |
| NL (1) | NL7706331A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57199505A (en) * | 1981-06-03 | 1982-12-07 | Hitachi Ltd | Work roll moving type rolling mill |
| AT383753B (en) * | 1985-12-20 | 1987-08-25 | Voest Alpine Ag | METHOD AND DEVICE FOR LUBRICATING THE ROLL GAP AREA OF A ROLLING DEVICE, ESPECIALLY FOR WARM TAPES |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1323757A (en) * | 1969-12-01 | 1973-07-18 | Nippon Kokan Kk | Method and apparatus for cooling hot metals |
| DE2419345A1 (en) * | 1974-04-22 | 1975-10-30 | Hamburger Stahlwerke Gmbh | METHOD OF COOLING IN WIRE ROLLING |
| BE837884A (en) * | 1976-01-23 | 1976-05-14 | Centre Rech Metallurgique | IMPROVEMENTS TO COOLING SYSTEMS FOR METAL PROFILES |
-
1976
- 1976-06-11 BE BE6045554A patent/BE842903A/en unknown
-
1977
- 1977-06-02 GB GB2349277A patent/GB1559632A/en not_active Expired
- 1977-06-04 DE DE19772725375 patent/DE2725375A1/en not_active Withdrawn
- 1977-06-07 FR FR7718251A patent/FR2354153A1/en active Pending
- 1977-06-07 JP JP6634177A patent/JPS52152854A/en active Pending
- 1977-06-09 NL NL7706331A patent/NL7706331A/en not_active Application Discontinuation
- 1977-06-10 LU LU77521A patent/LU77521A1/xx unknown
- 1977-06-10 CA CA280,285A patent/CA1068945A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2354153A1 (en) | 1978-01-06 |
| LU77521A1 (en) | 1977-09-26 |
| BE842903A (en) | 1976-10-01 |
| DE2725375A1 (en) | 1977-12-22 |
| JPS52152854A (en) | 1977-12-19 |
| GB1559632A (en) | 1980-01-23 |
| NL7706331A (en) | 1977-12-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |