SU1623805A1 - Method for rolling billets - Google Patents

Abstract

The invention relates to the field of rolling production, and specifically to the preparation of blanks on continuous signals, having universal stands with driven horizontal and single vertical rolls. The purpose of the invention is to intensify the process by improving the gripping conditions and increasing the rolling stability. The method includes compression in the sliding caliber, turning it to 45 ° C. vokru; The longitudinal axis and rolling in the four-high caliber of the universal stand with two drive rolls 3 Before the four-roll caliber, on two opposite edges of the roll, areas are formed that are perpendicular to one of the diagonals of the cross section and located at the distance L / g determined by of the regulated dependence of the four-roll gauge, the pre-setting, the orientation formed on the corresponding edges of the platform parallel to the forming rolls 4. As a result, the conditions for capture and increases with rolling stability, which allows you to increase productivity continuously by using a cKiiM by 3 G ,, 1 i i ф u, i, 1 and i I t ad i (Л

Description

/

/

Fig.Z

11 yuore i uiML o1 nose and i e i to pro i hUM for manufacturing, in particular to receiving blanks on continuous cianax, having universal stands with driven horizontal and idle vertical rolls

The purpose of the invention is to intensify

process by improving gripping conditions and increasing rolling stability

Fi I shows a gauge for forming pads on two opposite edges of a single diagonal, ia, general view, on phi 2 an intermediate position of a rolled strip before a task into a universal gauge, ie 45 ° rolled angle, in Figure 3

ike prok in universal caliber. Fig 4 with what is the formation of d y i conceived from the side of the drive rolls

According to the proposed method, after rolling out the initial preparation in brooks of a wide caliber, the roll is rolled in a unified, sphealic four-shaft caliber with water and idle two-roll pairs at the same time, the task of roll is not an unreal caliber on its two ribs, one diagonally, they form opposite platforms, separated from the vertices of the corners by the conditional continuation of the adjacent i goron of the roll in the direction of the tavern shapu, on

SRI / g PI N K U M (, M & C i.lBI And .10l I 11

.1 and

(I.

n

l

(C-1x) + g (& - 1),

and R N

 drive roll,),

Absanotnon value) reduction

drive rolls

BUT ,/.,. projections of arc lengths

right on the back and

 Alah rolls, /; The general value of ALINA t.ugi

jiaxBaia in the shaza zone oi / A and 1 “, gradius of conjugation of syuron races.

kata

Rolling 1 in four gauge calipers by rolling a strip in a quartz watch caliber of the cage At the same time, on 1 in 2 protruding 1 | o. Southern ridges of the diagonal 2 of the platform, for which along the bottom of the sliver caliber there are bevels iodine angle P to the horizontal (FIG. 1) The presence of the plots facilitates the turning of the outgoing caliber roll 1 around the longitudinal axis and the resulting torque from the asymmetrical application nai ruzki. , for example measures Kant po faces ii reilyak goy Rusk ori u ruets 1akim way that the eye area shvayuts facing the idler chetyrehvalkovog of ashbra, n |) and that PLO

0

five

0

five

0

five

about

five

pads parallel to the working surface (phi 2)

The formation of pads on the opposite edges of the subcategory can be done in another way, for example, with special crimping rollers after turning the strip along the longitudinal axis by 45 °

In chetyrehnalkovy gauge formed by two drive 3 and two idle 4 rollers, roll 1 is set in the position "On the edge (ph 3) At the first moment it concerns only the drive rolls 3 In this case there is a crushing (deformation) of the sharp edges (edges) of the strip, the emergence of areas of contact with the rollers and the forces of normal pressure and rhenium i contributing to the penetration of metal into a gauge B in the re- | The conditions of 3axnaia and are significantly improved. besides, the rolling stability is improved in the form of the south, which formed platforms 2 reliably orient the roll in the four-roll caliber and prevent it from rotating due to the realistic task of the nei problem of the strip in gauge, asymmetrical tackle, uneven wear of the gauge and so on

The presence of the formed plots makes it possible to significantly reduce the difference in the diameters of the drive 3 and idle rolls 4 in a positive manner, which has a favorable effect on the pattern, the formation of

О С О (1 ЯНИИ Н i il.. Formations and MSSP (b) not any kind, and formation of layers of metal 1 1 for each rolls, forming a two-pin x 5; 1 caliber, can be of the same diameter , which also increases the efficiency of the technical system from the point of (generation of equipment (tool)

Wine mattress for the Nin scatter n-14 (in RP; in tl / | n notyomom cpopviip Ku ppmiadii, produce on the basis of experimental

ЬШП1 I I1 pi I 1 H I i t ohm RICHS i KIH IIOe I

swum (phi 1)

11 life u 111 pnye i.eL1 doiani process- ia n |) SC.IOIOBOK C |, n (l on a continuous sai (trailing stat 850700/500 ()), nude experienced prokagok in four rollers with i drive on two rolls k) libra formed by two attached and two idle rolls of 420 mm in diameter. As v, we used a strip with a section of 102x102 mm (steel grade DG 3 Ps) by examining the blank rolls for smaller diameters to determine the conditions under which a gyrxhvalkov gauge will be captured

The results of the test of the conditions of seizure on aa ka with different diameters are given in the table.

As a page from the table, a reliable grip of rnkats is provided with a caliber,

formed by two drive rolls with a diameter of 420 mm and two single rolls with a diameter of 405 mm.

The cross section of the resulting blank 80x95 mm. the stretch ratio was 1.59, which is equivalent to the total stretch in two cells duo. Rolling proceeded steadily without slippage.

A four-roll gauge band capture occurred as a result of the fact that the drive rolls had previously touched the strip and on the edges of the initial billet there were formed contact areas sufficient to push the metal into the gauge. After inspecting the obtained blanks, it was established that the length of the geometric deformation zone on the drive and idle rolls is not the same and was 104.5 and 86.5 mm, respectively.

Thus, the difference in the projections of the lengths of the gripping arcs, equal to 18 mm, is sufficient to ensure reliable capture of the strip by a four-roll gauge under the given conditions of the experiments.

FIG. 4. schematically shows a cross section of a drive roll of radius A i, an idle roll (displayed on the plane of the drive roll) of radius R, having a common center at the point O. The projections of the lengths of the gripping arc onto the drive and idler rolls are labeled accordingly (.Hi.

The cross-section of an intermediate roll with a radius R3 shown from the center O through points B and D is also shown. The difference in the projections of the lengths of the gripping arcs is AB. Thus, the technical system of drive rolls of radius Rt and non-drive rolls of radius R, t when rolling square billets provides the required according to the conditions of capture, the difference is the length of the arcs of capture AB.

The value of ED uniquely determines the value of AB lie; the maximum groove occurs when the diameters of the drive and idle rolls are equal. The distance at which the pads are from the tops of the corners of the AL is made up of two values ED and g (-J2-1) where r is the conjugation radius of the rolled side faces. From FIG. 4 can be seen. In turn, 13С2 + (). Here, the value of the sun is the length of the arc of capture on an idle roll, g e. a CD where

 absolute reduction value.

For the limiting case, when the diameters of the idle and drive rolls are equal, the value, (# i - A / -) ().

If the radius of the idle rolls is equal, then the sites are not needed, that is, Ј0 0 and then (), which is equal to the distance from the geometric vertices of the corners to the vertices rounding the edges of the sections. In the other cases, when the radii of the drive rolls are selected in the range from RJ to Rt., it is required to form areas on the sub-rolls, which are separated from the vertices of the corners by the distance L. determined by the expression

; /.-////2+(/.)J

hp-lf.

 ABOUT

where / is the current value of the length of the arc of capture, corresponding to the selected radius of the idle rolls. The value of / takes the value in the range FROM If to / etc. 15If substitute in the above expression. we get (Ri

0

0

-Jl + Mv - l

with magnitude

A / g r () which confirms the correctness of the expression.

It is required to roll in a four-roll caliber formed by two drive and two idle rolls, a billet with a section of 230x230 mm. As a baseline, take a 5 square billet with a cross section of 285x285 mm in order to achieve a design stretch ratio per pass of 1.535, which is equivalent to the average total stretch in two duo cells. The absolute reduction is 140 mm.

In accordance with known rules, to transfer the results of an experiment to a real technological process, it is necessary to perform geometric similarity

4.P- /,

 )

iT Wv I

Where

- the ratio of the difference in the lengths of the gripping arcs on the drive and idle rolls to the radius of the drive roll in the experiment;

- the same, but for the real process

five

The ratio in the experiment is equal

but 0.0857.

Take the radius of the drive roll in a real process, equal to 600 mm. Then 0 to ensure reliable capture of the strip by rolls, on the basis of similar conditions, it is necessary that the difference in the lengths of the grips of the grips on the drive and idle rolls be / pr- / f 600-0, mm. The length of the gripping arc on the drive rolls, determined by the known formula, / 1Т .Ф -Д / У - (- & Ј-) - 281 mm. Therefore, the length of the arc grip on idle rolls should be equal to mm. Determine the radius of the idle rolls R after converting the formula / jt / xA // Г г and substituting the values of mm and mm. Finally, we get mm. Thus, the four-roll caliber formed noise with the radius RI is YY mm and O. BRAINS with idle radii Rz-4N mm ensure reliable grip during rolling.

Essential (

I"

- .45) ra in

diameters of IKOB can change the scheme of stress deformed about the state in O4aie deformation, cause uneven deformation of the metal layers over the cross section. As a result, increase the wear of the metal for shaving, reduce the quality from ie and; for h and 1lch, s pa i | nns1k w 1 nai r

To Eliminate the deficiency, the idius of servile rolls, taking a h, r equal to 500 mm, at the same time, form plows, perpendicular to dionine in cross section, and the blues ( L, defined by the expression

.

/. / "

. (2-g, M #),

For a section with a cross section of 285x285 mm, the trotting radius of the trot is r-40 mm. The length of the axle is 1 x on the home rolls pt di, the catfish is 500 v on – n and 1 is 1. I across the hemline mm After substitution of all the raw values into the initial expression, we WILL get / i-27.5 mm

A square with a section of 285x285 mm with a raft of 1 kak, perpendicular to the diagonal cross section, is formed in a quidish yasho caliber iyo stand, to which no less than 27.5 cm in the corresponding minds are located at an distance of less than 27.5 cm from the bottom of the bottom of the crest, or less than 27.5 cm from the bottom of the ridge at the distance of at least 27.5 cm from the bottom of the ridge at the distance of at least 27.5 cm from the bottom of the ridge at the distance of 27.5x the roll is rolled in turning rollers at 45 ° around the longitudinal axis so that the areas are turned (and charmed) to the working surface of the idle rollers, and then rolled in a four-fold caliber with a drive of two pulleys of even rolling in a four-roll caliberis allowed, 420 kN and cool conductive mo ment (on both rolls) 1355 kN m

Rolling is required in a chevy-roll-on caliber with a cotton drive with a section of 230x231) mm and a square with a section of 285x285 mm formed in a shchuchny to. H. Libra duolegge, the diameters of imported and idle rolls were equal to 1200 mm, those mm. technical system i point of unification

rolls, and also increases durability of idle rolls

After substituting all known values of technological values into the given, we get 8 mm. A roll of four gauge rolls form a duo stand in the caliber of the caliper, in which the corresponding angles provide bevels that are not less than the geometric angles at a distance of at least 38, 8 mm Deductive Hi Dus 4, iei and the edge of the turn around the longitudinal axis of the 45 ° turning rollers and ia 1, Ayu1 into the four-roll in6p i drive on the iBa im The presence of the pads on the ridges of the roll provides a reliable capture of the strip by rolls

The proposed method makes it possible to intensify the rolling process by eliminating slippage and zapping of the megalote in four rolls to 1 lib, which ultimately increases the productivity of the rolling mill in the middle of 1 5% and reduces the duration of the mill.

0orch (/ ha and uififh ienich

51 The way of pr (kagki (ayutovk, including compression in the caliber of caliber, canting of the roll on the 45th around the longitudinal axis and perforated in four, caliber with power and chateau roller pairs, meanwhile, in order to intensify improvement of the prossa nyie-m conditions iaxi, iia, and 1 ×) ch ip 11 of the lability of rolling i re i (t dissolving a four-roll gauge on 11 double edges, with ot so-called about June and iyoule form the opposite ppie r and pe i, K, i, ore GO-cnir from tops

Ут ут,, т 1 «, 1 | ц,, k i hKJio npoio.1 / t-een of the interim iacKiia goyons in the direction of the given diayun.r1 on the parachute of the D / i, otschedey and a

,

& n g

- (1-1.} - g (and 1)}

I,

Claims (1)

I u p, H pa in vi i |) ivo in 1L the guise is absolute about the compression of the curly i4fjMii 14 Ж projections of the lengths of the grippers corresponding to the drive and ho loe, / x rolls, / 1dext value d, 1 arc  n inaii iioiic from 1G; W L,  w | Genies sides ras a i l. d for the task of n gauge, the peal is directed by the indicated squares in the idle pair. 2 Method according to claim 1 - - tichchayuschaysch that the rolling is not i.y i in Ki / ь LOM whose sci caliber in the direction of the chip of one diagonal, having with “a ruff 1, poor on one symmetric с-хна хрмой site FIG. f Compiler you l my Relator Nelo. i enm a kravchukkorrektor o kravshim  ISSTIR / cPolice VNIIPI I oolsfs gvesk about the committee on inventions and discoveries at GK1P O. (, R II. (035, Moscow. F 35, Raushsk iab, l -1 5 I a large-scale industrial complex Patent, city v.i PaiapiiHa, 101 2 FIG L