CA2238063A1

CA2238063A1 - Rolling stand element and rolling stand obtained therewith

Info

Publication number: CA2238063A1
Application number: CA 2238063
Authority: CA
Inventors: Kurt Danielsson; Bengt Simonsson; Ferruccio Tomat
Original assignee: Individual
Current assignee: Danieli and C Officine Meccaniche SpA
Priority date: 1997-05-21
Filing date: 1998-05-20
Publication date: 1998-11-21
Also published as: BR9806595A; EP0879654A1; JPH1157813A

Abstract

Element for a finishing or post-finishing rolling stand for thin products with a nominal diameter or transversal dimension between 4 and 16 mm, able to be associated with another element to obtain a rolling pass, the element comprising a support box (14), a driving shaft (24) and a driven shaft (25) bearing a cantilevered rolling roll or ring (12). The driven shaft (25) is rotatably mounted on a flange (13) which is mounted on the support box (14) in such a manner that the flange can rotate around the rotational axis (16) of the driving shaft (24) for angularly moving the driven shaft (25) with respect to the driving shaft (24), while maintaining the two shafts (24, 25) meshed therebetween.
A corresponding rolling stand for finishing and post-finishing, including at least a pair of elements (10) as above, in which, when several pairs are provided, the center distance between one pair and the adjacent one is between 130 and 450 mm.

Description

~Or~r.rNG STA~DD F~.F~rr A~D ROLLING STA~n~ OBTP~ED 'l'~U~ H~
* ~ ~ * *
FT~.D OF INV~NTIO~
This invention relates to an element for a rolling s~and, S and alsc~ the rolling stand o~tained with this elemen~, as set forth in the respective main clai~s ~ ore .in particular, the invention refer~ to a ~odular element to obtain a finishing stand or a post-finishing stand i~ a rolling line.
~he invention also refe~s to a fLnishing or post-f;ni~in~
stand obtained with one or more pairc of ele~ents according to t~e invention.
The i~Lvention is applied in the field of hot rolling of thin p~.oducts, h~ving rounded, squared, hexagonal, rect~ngular, or other transversal section, of a nominAl diameter or transversal ~ ion between 4 and 16 mm,, made of stee'L and parti~ularly during the finishins and post-fini$h;n~ steps which precede the arrival of the product on the coil.-forming head o~ before the cooling bed or coolin~
ke~t ~ACKG~OUND OF 1~ INVENTION
The state o~ the art e~rs post-finishing stands with two or four rolling passes to obtain the desired finish to the hot rolled products having a thin section normally of between 4 and 16 mm ~ uring this rolling step, the real obtainable rolling speed di.ffers ~rom the theoreticdl rolling speed for a lot of reasons.
In the s~ate of the art, it is }~nown to carr~ out the pre-finishing pA~5~ whe~e the reduction has a fixed or variablesizing, whereas the last two or more ~inishin~ or post-finishin,g passes are with a variable sizing and de~ine the iinal iorm of the product, which can possibly be dive~sified ~ n the present state of the art, while the theoretical speeds is of 120-130 mJsec , the re~l speed ~ s no more then 105~110 m/sec Sta~e of the art post-finishing rolling stands have ~ollin~ rol}s or rolling rings with a m; nimllm diamete~ of between 160 and 190 mm and necessarily need guide boxes to guide the rolled product both at the inlet and at the outlet of the r-elative rolling rings~rolls.
miS i.s ~ecause the center distance between two stands, or b~L~e ~ two subseguent post-finishing passes, cannot at the present time go below 650~7~0 mm.
As a consequence of ~his considerable distance ~etween two contiquous passes, th~ guide boxes are necessar~; however, due to pro~lems of rotation, centring and interfe~ence w~th the rol:Led stock, they l mi t the real rolling speed, as we h2Lve said Docum~Lt ~S-A-~L .78~.653 proposes a rolling stand with two rolls which pivot horizontally around their axis of fee~, in order to increase the ro~lLng speed.
Although this proposal is valid, it does not solve the ~J prohl~m at all, first~y due to the presen~e of the axis of ~ee~ an~ also due to ~he fact that it is not possible to include, on ~he same structure, another pass rotated by 90~, 2~ except with conside~able constructional and operational complexi.~ies .
Moreo~er, even if~ there were a further pass, it would be too dist:ant to allow the boxes to guide the rolled stock to be el;m; n~ted.
~ocument ~Neues Draht- und neues Mittelstahlwalzwerk fur die ~kraine~, Rolf Schenke, 2g54 Draht, vol. 44, no. 12, 1 Decembe:r 1993, describes a rolling plant for wire rods, wherein the rolling stands have the rolling rolls cantile-vered mounted ~nd o~fsec with respect to th~
correSpon~;ng~ drivin~ shafts. In this document nothing is tau~ht ,about the variability of the dist~nce of rolling rolls wi.th respect to the rolling z~ s and z~bout the redu~ed center ~listance between the rolling rolls of the rolling stands, whereby the z~bove mentioned problems zlre not solved Document ~P-A-~?-190703 descri~es a rolling stand constituted by two groups, each having a rollin~ roll cantile~Jered mounted on a cor~espo~ding support flange ~, 10 rigidly fixed to a driv~g box on which a drivinç~ motor is mounted.. In this document, wherein each rolling roll is of~set with respect to the Z~KiS of the motor, for varying the distance between the rolling rolls, one entire group, is moved wn.~h respeck to the other, i~cluding the driving box and the motor, Docu~ent DE-A-29 lS 295 describes z rolling stz~nd with cz~ntilet~ered mounted rolling rolls for the production of wire rods, wherein a single motor causes the rotation of three ~roups of rolling rolls disposed at 120~ one with respect to the others In this document each group of rolling rolls is swinging with respect to the driving axis by m~z~nc of complex and expensive ac~uating hydraulic cylinders.
Document GB-A-50~,456 des~ribes a ~ery old ~ystem for re~ulating the distance between the rolling rolls of a rolling starld, constituted h~ two autonomous groups, wherein each group is slidably mounted on a ~ixed ~rame and wherein the roll.ing rolls are cz~ntilevered mounted and offset with respect to the driv~ng mez~ns Al~o in this system, for ~a~ying the distz~nce between the rolling rolls, the two groups are reciprocally mo~ed with respect to the ~ixed frame, whereby the ~ystem i~self is cumbersome and unsuitable, and does not sol~e the problem of the reduced cente~ distance between the rolling rolls.
The present applicant has therefore designed and tested this invention, which ove~ the limitations of the state of the art, ~nd makes it possible to obtain finishing 5 sta~ds, wi~ch one or mo:re pa~;ses, w~ich work at a much higher speed than that which can be obtained at present.
SU~RY 0~ ;N'l'10..
The i:nvention is set forth and characterised in the respective main cla~m~ while the dep~n~nt claims describe ~ 10 variants of the idea of che main f~im~.nt Accordiing to the invention, a mDd~lar element is included which bears rolling rolls or rings with a m; ni ~llm diameter of abou~ 70 mm and a maximum diameter of about 1so mm.
~ ceordLing to the invention, i~ is advantageous to include a range o~ diameters of the rolling roll/ring of between about 90 mm and about }10 mm Accord~ing to the invention, the axis kearing the rollin~
roll/ring is borne offset by a disc or ring type flange which can rotate aro~nd its own axis and allows the roll/ring-bearing shi~~t, whic~ is parallel tO the axis of rotatio~;L of ~he flange, to rotate describing at least a a:rc o~ a ci~ct~mference.
~ he roll/ri~g-bearing sh~ft is supplied with motion by a gear whic~ is coa~Qal to the axis of rotation of ~he ~lange.
According to a variant, the gear which carries the motic~n coa~ial to the flange receives motion directly ~rom a kinematic motion c~mon to all the elP~A~ts of the stand ~ ccord~ny to another variant, each elemen~ receives motion ~rom i~s own drive device.
Accorcling to another variant. ~he gear which c~rries the motion c:oaxial to the ~lange receives motion from a pair o~
~apered gears which is made to rotate by a common kinematic motion.

With this invention, two rolling rings or rolls can be m~de to coo~e~ate so ~s to constitute a finishin~ stand or pass, with the respective support boxes or shaft-bea~i3rlg elements on which the fl~ng~s are positioned, without there being a~ly inter~erence hetween the boxes themselves; the boxes are thus facing each othe~, offset and inverted w~th the axes of the rolling rolls or rin~s o~fset but parallel therebet~een With the present invention, in the ~ree areas between the two elements or support boxes which carry the respe~tive rolls or rings to cons~itute a rolling pass, it is possible to place two other elements, in or~er to obtain another rolling pass with a ~inimAl center distance ~rom ~he previous pass With the present invention it is therefore possible to obtain one or more finishing rolling p~sses with a m;n;mllm center clistance hetween a~out 130 and about 450 mm with regards to size.
It is within the scope of the present invention to include ~ m;n;ml~m center ~istance b~tween about 140 mm and a~out 250 ., mm. .
Accord.ing to the va~ïant which includes the pair of tapered ~ears, it is possible to include a single so~rce of motion, placed verticall.y ~or example, with four or more outle~s to be connected to the respective support boxes, ~s the outlets are substant;~lly parallel to the rolling axis The scurce of motion, fo~ ~xample, including a ~ertical plate wi.~h the desired kinematic chain or reduction unit inside, may include on one face two outlets which are connected to two elements according to the invention so as to co~st:itute a first fit~ish;n~ pass.
According to a variant, on the sa~e face the sour~e of motion 3nay include two plus two outlets so that four elements according ~o the invention (two plus ~wo) may be installed so as to co~stitute two suceessi~e finishing p~sses Acco~ding to another variant, on the other face it is possible to obtain respectively two or four outlets so that with a single plate as many as ~our finishing passes may be oh~
The el.emen~s according to the present in~ention include means to position them rapidly on the motion means.
- 10 It is th~s possible to ch~nge each individual element rapidly so as tc facilitate not only main~enance operations but ~lso equipping operations and operations to change me~sur~ts.
According to the invention, in a side ~iew, the element is - 15 ~hAr~ like a 'P~, with the rolling roll or ring mounted on the lower t~in~l ~nt;;l o~ the leS~ of ~he ~P".
BR3~EF DEScRlPTION OF I~D~ D~ noNG
The attached figures are given as a non-res~rictive example, and sh~ the invention as follows:
Fig. 1 sihows an example of an application o~ the invention with ~our elements so as to create two ~inishing rolling passesi Fig. 2 shows a ~urther example of another application o~ the i~ention.
DESCRIPTION OF THE PREFERRE~ ~MRODIKENTS
with re~erence to the a~taohed figures, each modular element 10 includes a suppor~ box 14 to which is associated a disc t:ype flange 13 which is provided of a pivot 29 which allows the flange 13 to rotate axound a first rotatio~al axis 16.
The Sl~pport box 14 i~ able to ~e remova~ly fixe~, for example to a fra~e 30, in ~ predetermined position with respect to A rolling axis 11 In the support kox 1~ is rotatably mounte~ a driving sha~t 24, co~xiial to the first rotational axis 1~ and provided with a driving gear 124 of cylin~rical fo~m.
A dri~en shaft 25 is rotatably mounted on the flange 13, co~ l t:o a second axis o~ ro~ation 18, which is parallel and o~s~t with respect to the ~irst rotational axis 16 At ~n exter~al end of the driven shaft 25 is cantilever mounted a rolling roll or ring 12 having a diameter between 70 and 140 mm., a~vantasreously between 90 ;~n~ 110 ~an 10 The driven or roll-bearing shai~t 25 is provided on an internal end with a driven gear 1~5 ~eshed ~ith the driving gear 124, Accord;in~ to first embodiment, the dri~ing shaft 2g is c~irectly associated ~o an autono~ous drive motor lS, so th~t in the case of a rolling stand with four rolling elemen~s 10, which constitute two pairs o~ rolling rolls or rings 12, or two rolling passes, ~our drive motors 15 are pro~ided ~fig l) Ac:corc~.ing to a variant, shown in f ig 2, the drivinsr shaf t 20 24 is pro~rided with a ~irst tapered gear 23, meshed with a second tapered gea~ 123, which receives Inotion f~rom a motion-inle~ axis 17 w~ich is parallel to ~he rollin~ axis 11 .
Accwrding t;o this variant, the modular element 10 may be 25 associated wi~ch a reduction unit 19 which contains any kind of kinematic chain whatsoever, which is associ~ted with a drive de-rice 2 ~ .
It is clear that in this latter case, whe~ein a sin~le drive dievice is provided, the single motors are not necessary.
The re'~uction unit 19 comprises a ce~tral gear 20, coaxial to the rolling axis 11, a~le to supply motion to a dri~en ~ear 21 which, by means of a f~st coupling 22, can ke easily conn~cted ~o ~he t~pered gear 123.
The axis of the driven gear 21 coincides ~ith the axis 17 whereby motion enters the e~m~~t lO.
The cen*er distance ~i~ bet~een the rot~tional axes 18 of two adjacent pairs of rolling rol}s or rin~s 12 is there~ore very small, for instance ~etween 130 ~nd 4S0 mm , adv~ntage~usly between 140 and 250 mm Fig. 2 show~ an embo~;~Q-nt with three rolling p~sses.
F~st centring means, and fast assembly/detachment means may easily ~ pro~ided to removably fixing each element 10 to the ~ram~ 30.
Wit~ this invention, successive rolling passes can be rotated ~ gO~, or an inter~i~te pass may be not rotated.
~ here~ore, with this invention it is ~ossihl~ to obtain at least the follc~wing c~mhin~rions:
oval-ro~ ~ ~2 passes);
round-o~ll-round t3 passes~;
oval-ro~ld-round (3 passes);
round-o~l-oval-round ~4 passes)i oval-ro~ld-oval-round (4 passes).

Claims

1 - An element for a finishing or post-finishing rolling stand for thin products with a nominal diameter or transversal dimension between 4 and 16 mm., comprising a support box (14) fixedly mounted with respect to a rolling axis (11), a driving shaft (24) rotatably mounted in said support box (14) around a first rotational axis (16) and provided with a first gear (124), a flange (13) coupled to said support box (14), a rolling roll or ring (12) cantilevered mounted at an end of a driven shaft (25) which is rotatably mounted on said flange (13) around a second rotational axis (18) and is provided with a second gear (125) meshed with said first gear (124), said first and second rotational axes (16, 18) being parallel and offset therebetween, characterised in that said flange (13) is mounted on said support box (14) so as to rotate around said first rotational axis (16) for angularly moving said driven shaft (25) with respect to said first rotational axis (16), maintaining said first and second gears (124, 125) constantly meshed therebetween, whereby the distance between said rolling roll or ring (12) and said rolling axis (11) can be selectively varied by means of the rotation of said flange (13) with respect to said support box (14).

2 - An element as in claim 1, wherein said driving shaft (24) is connected to a corresponding motor (15).

3 - Element as in Claim 1, wherein said driving shaft (24) is connected to a motor element (26) through a reduction unit (19).

4 - An element as in claim 3, wherein said driving shaft (24) is provided with a first tapered gears (23) meshed with a second tapered gears (123) connected to said reduction unit (19).

5 - An element as in claim 4, wherein centring and fast connecting means (22) are provided between said second tapered gears (123) and said reduction unit (19).

6 - An element as in claim 1, wherein said rolling roll or ring (12) has a diameter between about 70 and 140 mm.

7 - An element as in claim 1, wherein said rolling roll or ring (12) has a diameter between about 90 and 110 mm.

8 - An element as in claim 1, wherein said support box (14) has a substantially parallelepiped shape and wherein said driven shaft (24) protrudes from said support box (14) near to a lateral side thereof, parallel to said rotational axes (16, 18), whereby said element (10) is substantially "P"
shaped with said rolling roll or ring (12) placed at the lower terminal end of the leg of the "P".

9 - A rolling stand for finishing and post-finishing for thin products with a nominal diameter or transversal dimension between 4 and 16 mm., comprising a pair of rolling elements associated therebetween to define at least a rolling pass, characterised in that each one of said elements is constituted by an element (10) according to any of the claims hereinbefore.

10 - A rolling stand for finishing and post-finishing for thin products with a nominal diameter or transversal dimension between 4 and 16 mm., comprising at least two pairs of rolling elements associated therebetween to define at least two rolling passes, characterised in that each one of said elements is constituted by an element (10) according to any of claims 1-8 hereinbefore, the center distance between the rolling rolls or rings (12) of said two pairs being between about 130 and 450 mm.

11 - A rolling stand for finishing and post-finishing for thin products with a nominal diameter or transversal dimension between 4 and 16 mm., comprising a plurality of pairs of rolling elements associated therebetween to define a plurality of rolling passes, characterised in that said plurality of pairs comprises at least four pairs of said elements which define at least four corresponding rolling passes, and that each one of said elements is constituted by an element (10) according to any of claims 1-8 hereinbefore, the center distance between the rolling rolls or rings (12) of each one of said pair being between about 140 and 250 mm.

12 - A rolling stand as in claims 10 or 11, wherein each one of said rolling passes is rotated by about 90° with respect to the adjacent rolling pass.

13 - A rolling stand for finishing and post-finishing for thin products with a nominal diameter or transversal dimension between 4 and 16 mm., comprising a plurality of rolling rolls or rings (12) cantilevered mounted at an end of corresponding support shafts (25) driven by motor means (24), characterised in that the diameter of said rolling rolls or rings (12) is between about 70 and 140 mm. and the center distance between a pair of said rolling rolls or rings (12) and the adjacent one is between about 130 and 450 mm.

14 - A rolling stand as in claim 13, wherein the diameter of said rolling rolls or rings (12) is between about 90 and 110 mm. and the center distance between a pair of said rolling rolls or rings (12) and the adjacent one is between about 140 and 250 mm.