DE2444630A1 - ROLLING FRAMEWORK - Google Patents

Description

PATENT ADVOCATE

Dipl.-Phys. R.Luyken

ÜCHEN a _; .TAL «

Chernoy Metallurgy Institute P 52 429 Dnepropetrovsk / USSR

18. Sent. 1974 L / Br

ROLLING STAND

The present invention relates to the ketallv / alzen, in particular rolling stands of a rolling mill in block construction for longitudinal rolling full and hollow metal rods.

Find now! Roll stands ^ preferably ^ with two and three reel usage

With two-roll scaffolding, the rolls are at an angle of 4-5 ° to the horizontal plane and each pair of rolls in the rolling mill stands at an angle of 90 ° in With regard to the pair of rolls of the neighboring roll stand employed

With three-roll stands, all three rolls are under

at an angle of 120 ° iij relation to each other and each rolling mill stand is at an angle of 60 ° with respect to the neighboring rolling stand around the rolling line

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turns.

In the known two-roll stand, the 7felzen by an electric motor via a transmission and intermediate gear driven. The roller pair receives the rotary movement from a system of hyperboloid gear wheels.

The mentioned, mounted on the housing of the main transmission two-roll stand is as working platform practically _VO n no independent significance and must be considered together with the gear design of the main drive, which is designed to transmit the torque for a series of similar, collated to form a block mill stands at the same time .

Through the use of precision gears, in conjunction with helical toothed comb rollers in the main drive of the rolling stand the possibility of couplings and Eliminate spindles in the drive and increase the rolling speed up to βO m / s.

The implementation of the 'rolling process at high speeds requires an increase in the manufacturing accuracy of the gear teeth · The teeth of the main drive of the roll stand are therefore produced in accordance with the most appropriate 11th to 12th accuracy class.

Lifting positive technological and constructive features is the well-known two-roll stand with the following Disadvantages.

The increased rolling speed in the mill stand thought ddt elaboration of additional measures

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mm

the improvement & ^{e: c} dynamic characteristics of the roll stand es ζ «Β · the attachment of vibration dampers in the main is required,

transmission of the drive. making the gearbox construction even more complicated.

The gearbox construction of the main drive of the roll stand is extremely complicated, the gearbox has one

have to

heavy mass and its assemblies according to high accuracy

be

Keitsklassen produced »which increased production costs of the individual assemblies of the roll stand "conditional. -. - .

^Ierner _β ^ _η two-roll stand is known, the rollers of which are driven by a variable speed motor via a common distribution gear, via gears specially designed for each roll stand, which are combined with comb roller stands and arranged along the frame of the stand block, and via drive spindles with Hooke's joints.

The main disadvantage of this roll stand is the complexity of the construction of the main drive the bulky one in the main drive of the roll stand

total
Equipment, the 'dimensions of the scaffolding block and its weight are increased considerably.

As test data showed, the spindles in the main drive with Hooke's joints have a considerable effect Vibrations of the axes of the rollers and each of the rollers themselves, which are overhung on this axis.

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are animalized. The vibration amplitude of the rollers is reached in individual cases significant values »which reduce the tolerances of rolled products are exceeded

The presence of considerable mechanical vibrations in the roll stands of this type has an effect not only on the geometrical dimensions of the rolled products, but also on the resistance of the storage

these

units of the roll stand by being greatly reduced

A construction of the three-roll stand is known with an input shaft and internal rotation distribution with the help of bevel gears, which are preferably when rolling metal rods from carbon and low-alloy steels is used · The minimum diameter the rolls of these roll stands is 250 mm and the maximum rolling speed of bars in the rolling stands about 45 m / s.

I ⁿ roll stand? This design ^{uses various overall arrangements of} * bevel gears · The rollers can sit on rotating and non-rotating axes «

mentioned

Among the disadvantages of the design of the

The three-roll stand includes the arrangement of the bevel gears, those designed to operate at high speeds

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require high manufacturing accuracy within the roll stand. In the internal distribution of eotation decreases the load-bearing capacity compared to the two-roll stands the bearing units and the bevel gears,

total

because the dimensions of the bearing units and bevel gears through adjacent end faces of the neighboring Rolls and their intersecting axes are limited

A construction of the three-roll stand is known a high-performance drive connected to only one roller and two drag rollers

This design eliminates a number of disadvantages of the three-roll stands, but at the same time creates a number of disadvantages of new disadvantages

In the roll stand of this type of construction, the gripping angle increases

mentioned

compared to the previous three-roll stands around the

a threefold, which has an adverse effect on the possibility of further increasing the rolling speed · The Operating conditions of the rolling facility are also determined worse·

The slow down while the rolling mill is stopped Drag rolls the speed of rotation, which causes a detuning of the roll revolutions in the roll stand. On resumption of rolling, at the moment when the bar is gripped, additional dynamic loads occur in the rolling stand on·

In addition, the roll wear increases in this roll stand.

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A design of the three-roll stand is known a drive of great power associated only with an orphan, and with. a special auxiliary drive for two additional rollers that are not mechanically coupled to the drive roller or to each other

contains

drive of the two roller boxes / which are fixedly arranged on chocks of the stand, inside

from
half of which turbine wheels are mounted on the roller axles »A jet of liquid flows at high speed from a nozzle attached to the box housing in the direction of the tangent ^{to the} : wheel of the turbine and drives it (s · ÜS patent document" 3 611 77?}

A disadvantage of this scaffolding construction is the The fact that the use of hydraulic drives to start the "drag rollers", which avoids the use of bevel gears, does not provide a possibility to create a compact overall arrangement of the roll stand

like them overall

fen «. the maximum possible reduction of the dimensions ensures the rolling mill by providing a Einbauahtriebs in de ^m the existing structural elements of the roll stand, (chocks, rolls) are utilized ·

At the same time, the analysis of the development of. highly effective rolling mill equipments that their development

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leading ^to the creation of compact constructions small format goes, the maximum possible operational safety guarantee ·

^ei use of hydraulic drives to start the "drag rolls" is the use of a precise hydraulic equipment is required exposed "the zudem.einem considerable wear and reliable seals required ·

A flat part of this roll stand. also educates

for synchronization

the lack of synchronizing elements / the speed of rotation of the two "drag rollers" with the speed of rotation of the king roller, what the work of the roll stand and the scaffolding block. . at the , . Operation at high speeds much more difficult

Four-roll stands are known, but seldom used at present · One of the disadvantages of these roll stands is their complexity in construction and low strength »

The purpose of the invention is to eliminate the disadvantages mentioned

The invention is based on the object of ^{creating a roll stand ^ 11} block construction that offers the possibility:

- the rolling speed compared to the existing ones

Scaffolding - similar type to raise, overall

- the dimensions and weight of the roll stand due to the compact arrangement of the assemblies of the roll stand

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riistes to diminish

- Impact loads and vibrations in the roll stand remove

- to simplify the scaffolding »what the reduction of manufacturing?» '* - as well as maintenance costs

should bring about.
at em
This wirdVein \ mill ⁱⁿ block construction for rolling

of metal rods / - the one stand with chocks in which bearings. are arranged »the an axle with a work roll and at least one axle with

record and

"Drag roller" contains a drive for driving the work roll and drives for the "drag rollers" ₇

J. is enough. that ^

e according to the invention ^ v ^ "3each" drag roller "

one

arranged on "v Pe st axis and hollow ± sp that
formed £ ± and its cavity _n on the axis of ^a stator winding provided istdie to an AC power supply source is connected and arranged on the inner surface of the roller relative to the stator, a ring insert made of electrically conducting material "there being an air gap between the stator and the ring insert ·

It is useful to use the ring insert in the form of a layered ring made of hard magnetic material »what the manufacturing technology of these inserts to simplify significantly and their costs considerably lowering allowed

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-9-

It is also expedient to form channels in the plague axis of the "drag roller", which feed air into the cavity of the roll, and in the body of this roll radial ^{channels running along the} roll axis, which divert air from the cavity of the roll to its outer surface.

The presence of channels »through which air flows improves the cooling of the stator winding · '

It is also advisable to use the longitudinal channels to

'' Eic tfcung,

direction ... of the roller opposite below to be arranged at an angle to the direction of the e-axis, which offers the possibility to reduce the starting power of the roller motor

will

Created with the invention ■ "a rolling mill stand which enables an increase in the rolling speed in comparison to the scaffold ^en similar type,

significantly increases the performance of the rolling mill and ^{the data-technical} and economic characteristics, as well as improves the compactness of the roll stand increases and overall dimensions and weight decreased · The invention will now by way of example with reference to the accompanying drawings in more detail; show it

fig · 1 eia block-type rolling mill for rolling von Metallstäbea ^ *. executed according to the invention m

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Roll stand in plan view,

Pig 2 the rolling stand carried out according to the invention, in view along the rolling line with partial section,

Pi". 3 the assembly ¹¹ A "in Pig · 2 with TeiX section (enlarged),

Pig. 4 the "drag roller", in plan view with partial section which shows a horizontal air duct, which is directed at an angle to the roller axis,

Pig 5 is a view of assembly "B" in the direction of the arrow "C" in Pig. 3 ·

That in Pig. 1 shown rolling mill in BltDckbauwei-

one
se consists of a common electric variable speed drive

1, group transmission 3 of the rolling mill with the variable speed drive 1 is connected by means of a clutch 2, a stand 4 of the stand block on which the roll stands

5 are arranged, execution shafts 6 of the transmission and. electric speed sensors 7 eier execution shafts

6 of the roll stands 5

The donors 7 are on shafts (not shown)

the Ausführungewellen 6 of the transmission 3 ^to 5 rolling stands opposite sides disposed on ^de *.

The roll stand 5 (Pig 2) has rods

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of the 8 with the chocks 9 »10, 11, 12, 13 and 14 arranged therein, in which the work roll 15» the of the drive shaft 16, and two of the same, on plague axes 19 and 20 arranged "drag rollers" 17 and 18

are stored.

To simplify the description, only one "drag roller" 17 will be discussed below.

. The hollow "drag roller" 17 (Pig · 3) comprises _the hollow body 21 with the immovable stator 22 (stator winding) mounted on the Pest axis 19.

The stator 22 is made with the aid of a transition ring sleeve 2 ^ placed on the plague axis 19

On the inner surface of the hollow body 21 of the roller is attached, a ring insert 24 made of electrically conducting material (layered hard magnetic Hing) is "The Hing insert 24 is locked in the hollow body with a sleeve 25 and running together with it ^to · About support ring sleeves 26 and 27 is the Hollow body 21 mounted in roller bearings 28, 29

In the pest axis 19 of the "drag roller" 17 are lubricant feed channels 30 and 31 are provided for the bearings 28, 29 and lubricant discharge channels (not shown). In addition, an outer longitudinal groove (not shown) is provided in the Pest axis 19, which is used for connection

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rl2-

electrical feed lines of the stator 22 is used

To cool the. Stator 22 are in the fixed axis 19 channels 32 and 33 for the supply of dried compressed air and in the body 21 of the hollow roller 17 vertical channels 3 * and horizontal channels 35 'for removing the compressed air out of the cavity. 36 of the roller provided

It should be emphasized that the horizontal channels 35 'which lead off the compressed air to the outer surface of the body 21 of the hollow roller 17 are not directed exactly perpendicular to this surface, but - as Pig · 4 shows - in the horizontal plane below a certain level. Angle ^to

The roller axis can be arranged in a side opposite to the direction of rotation of the roller the compressed air flowing out of the channels 35 has a reaction torque, which the AnI, on the power of the roller motors because it adds up to the electromagnetic moment. Thus, favorable operating conditions of the roller motor ζμ start of roller rotation and after start-up created by the roller during its further work

To accommodate the roller bearings 28, 39 on the fixed axis 19, screw nuts 37 are provided

To synchronize the speed of rotation of the "drag rollers" 17 and 18 and the speed of rotation of the Work roll 15 are in the rolling stand contactless encoder.

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ordered, with the one immovable part of the encoder 38 and 39. with the end surfaces of the facing these rollers Chocks 9 and 12, the second movable part of these encoders with the end face of a removable annular sleeve 27 (Pig · 5) united and facing the immovable part of the encoders 38 and 39 · The end face of the removable Ring sleeve 27 represents a surface with elevations 40 and valleys 41.

Structure and mode of operation of these contactless encoders, are known and described in detail in the technical literature «

. The ^ ^e . The construction of the roll stand is compact, has increased rigidity and a relatively low weight, and the rotating parts can be easily ^{balanced dynamically} .

. The rolling frame works as follows

On the (not shown) Be serves mgs stand and des in Pig * 1 shown rolling mill makes the masohiniBt of the Rolling mill all (not shown) circuits control circuit of the variable speed drive, control circuit of the AC supply source with an operating frequency of more than 50 Hz and a synchronizing circuit of the rotational speed s of the work roll and the "drag rolls" - ready for connection «You can use *.,; _ _ · known

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Find electrical circuits used for the appropriate working conditions *

The machinist then switches on the cooling of the stator 22 by supplying compressed air to the cavity 36 ♦

The control measuring apparatus (not shown) on the rolling mill allows the electrical control drive and the electrical supply sources to be switched on Stator windings only in the presence of lubricant in the bearings and compressed air in the cavity 36 of the "drag rollers" ·

Furthermore, the machine operator of the rolling mill switches the electric drive 1 and the supply sources of the stator windings on · With the help of the coupling sleeve 2 drives the electric drive to the group transmission 3, which is his ei t s with the aid of the guide shafts 6 and the drive shafts 16 of the roll stands 5 to rotate the work rolls 15 begins, with the electrical transmitter located on the shafts of the execution shafts 6 of the transmission 3 7 register the speeds of rotation of the work rolls 15 »

From the donors? electrical signals get to the electrical control circuits of the supply sources and the Comparative attitudes of the Drehgeschwindigkaiten the work swalz θ 15 and each of the "drag rollers" 17 and 18 · By supplying an alternating current of increased fre-

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sequence to the stator 22 generally arises air gap 42 between the stator 22 and the ring insert 24 * made of electrically conductive material (layered ring made of hard magnetic material) a rotating field that, when interacting with the hanging insert arranged on the inner surface of the body 21 this 2u begins to rotate, driving the roller 17.

By taking place via the electrical transmitter 7 Acting on the puncture of the food sources of the stator windings, the Arbeltswalze 15 regulates its function and

represents one of the rotating speed of the work roll 15 simultaneously

near rotational speed of each of the "drag rollers" 17 and 18 a.

In order to lag behind the rotational speed of the "Drag rollers" 17 and 18 with regard to the speed of rotation to avoid the work roll 15, which due to aerodynamic

-by

dynamic friction losses of rollers 17 and 18 water « which is fed to the caliber 4-J for the purpose of cooling it occurs, each "drag roller" is an additional one in the electrical function control circuit of the supply sources Synchronization of the rotational speed of the "drag rollers" 17 and 18 with the rotational speed of the roller 15 intended"

For this purpose, on the end faces of the installation

the η

Pieces 9 and 12 immovable © Parts of the electrical transmitter 33 and 39 are provided, which are connected to the comparison circuit the speed of rotation of these rollers with the

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Schwindigk © it. the work roller © 15. pageclosed »

- _ Mese circuits are in turn via electrical • feedback with the control gears of the supply sources in , connection and correct "the function of these sources"

by doing"

ness at the Arbeitswal & d ^is set 15? let the synchronization of the Brehgesctoidaälgkeit the "drag rollers" 1? .and 18 with .the speed of rotation of the roller 15 "ended»

The rolling mill is now ready for use. This is followed by rolling iron metal bars

Rolling mill ia sighting of the arrow shown in Pig © 1

according to

'An essential step forward for invention

: eü, etes forms the avalanche γοη contactless electric motors which are built into the " drag rollers" to start them up and to synchronize their rotational speed with the rotational speed of the Jj? beitswaize®

A selche structural configuration of the "drag rollers ¹ * ^ the possibility delivers" the Walsgeschwindigkeit and thus di © performance of the rolling mill @ s to ER significantly

An increase in the speed of fall is achieved because the seg © lverzahnuagea name of the roll stand structure is omitted », the gripping angle remains

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2U46.30

uniform The lack of bevel gears for rotation

the - rolling in the roll stand offers the possibility of to vary the diameter of the rollers, being technological seen -the diameter and the stretching coefficient -of the rolling rod in the stand caliber optimal can be chosen.

This constructive version of the "drag rollers"

also allows the main dimensions of the roll stand, whose

and reduce weight as well as the rigidity and strength to increase the roll stand

To increase the rolling speed of the roll stand also carries the simple, for that. Roll stand used construction of the group gear with spur gear teeth for

That . _: . "Roll stands offer the possibility of creating rolling mill equipment that has high dynamic characteristics and a wide control range of rolling speeds from a rolling speed that is common for pre-stretching stand groups to a rolling speed that is characteristic of the sizing stand blocks of wire rolling mills.

The ^{roll stand gives you} the opportunity to

to achieve a rolling speed of 80 m / s and more, which was previously not possible in practice.

Compared to a pressurized water rotating device

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of the "drag rollers", the rolling stand has large

se forteile on _t because the 'hot agile ^ el t is omitted, pre-

en

sise provide hydraulic equipment and desire at the mill ,, whose operating conditions at the mill considerable difficulties are "Moreover pushes the use of a high-pressure hydraulics to major difficulties in creating DE® Bre hz ahlregelsystems the rolls ·

according to

A Torteil of fiction, ^ mill makes it more ^ _e fact ₉ that the elektrot used · technical Element® (stator 22 and Hing insert 24 of hard magnetic material (j. Fig®. 5) interchangeable frame parts and can be very much indeed used. Practically unlimited © The lifespan of the mentioned elec-

• Inexpensive electrical engineering elements ^ΧΞΪ non-aur. by Be--

hocly 'can
Operating conditions change also by using

Animals
synthetic tfberaügen extended The stator 22 can Z ₉ Bm be coated with an epoxy resin © that guarantees mechanical strength and penetration

ity

oil and Peuchf ia prevent the winding ©

total

With simplicity. And small. .has dimensions

according to the invention

the roll stand ^ln;. Sheet metal construction in comparison

from the well-known ■ roll stands in block construction the widest technological possibilities

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Claims (1)

^; 24 ^ 4630 P 52 429 . "- 19- ■ - ■ ^: - ■■. Sept. 18, 1974 PATEHTAL DISCLAIMER B. . ·) Rolling stand in block design for rolling metal rods, which has a stand with chocks »in which bearings are arranged, which have an axis with working · ■ -. "'■" - ■ "· and take up roller and at least one axle with "drag roller" a drive for driving the work roll and drives the "drag rollers ¹¹ contains; thereby ge - ke η η ζ ei ch η et _f that each "drag roller" (17 or 18) on a fixed axis (19 or 20) is arranged and hollow, so that in its cavity (36) on the axis (19 or 20) a stator winding (22) is ^connected to an alternating current . . ■ ■ - ^Λ is 'that' power source connected and on the inner surface of the roller (17 or 18) have a ring insert (24) opposite the stator winding (22). hard magnetic material arranged ■ is, wherein there is an air gap (42) between the stator winding (22) and the ring insert (24). 2 · Roll stand according to claim 1, d ad urchgeke η η ζ calibrates that the ring insert is designed in the form of a layered ring (24) made of hard magnetic material _: 3 · Roll stand according to claim 1, characterized in that in the fixed axis (19 or "■; ■■" 609Β1Λ / 0Τ5Ί 24U63Q. 20) of the drag roller (17 or 18) channels (32, 33) t 'which the cavity (36) of the roller (1? Or 18) air aim.Cooling of the stat © winding (22) en ₀ and in the body this roller (1? bswo 18) radial (34) and along the roller axis (1? or 18) running Mngska & ale (35) are formed the air from the hollow space of the Walz® (17 or » 18) Walsgerüst asch lasprueh Jr ₀ dadurc (35> ζ ei ehset « 18) in to direction opposite .mates ¹ iron geidssea angle arranged at the drawing day of the _ axis. . . siia.de 6098U / 0151 Blank page