DE2232803A1 - ROLLING MILL FOR COLD ROLLING THIN WALL PIPES - Google Patents

Description

ΟΰΟϋ Munich 22

Zv.-eibrückenstr. 6th

Vsesojuznyj naucno-issledovatel'ski ji P 37 Ί5Ό / 2 Konstruktorskotechnologiceskij institute 4-. July 1972 trubnoj promyslennosti L / Br

Dnepropetrovsk / USSR

WALZWSEK FOR COLD ROLLING Dt) IiHWANDIGEIT ROHREU

The present invention relates to tube production, in particular to rolling mills for cold rolling thin-walled tubes

It is a rolling mill for cold rolling thin-walled and

extremely thin-walled pipes known, which is a working

for auf_jl§jp
equip _with bearings <unrolling pipes and they

nit loin rolls with calibres of variable cross-section on which

V / alzen attached! Final gears ^ for the reciprocating

with

de Movement of the stand and the rollers and racks on which the end gears roll and fix the position of the rollers, '> as well as a motor for

Drive - - of the whole rolling mill

and includes a tube feed and rotating device (see · «·» US. -Pi 3.O3O.035 of April 24, 1962).

309883/0817

_ ρ -

At your well-known pipe cold rolling mill, egg. Drive gears are used, which ensure an average rolling radius on "the length of the entire roller caliber ·

This leads to the deterioration of the rolling process due to increased sliding of the caliber on the tube, to the increase in the MlIe, where the pipe to be rolled and the pipe to be pushed with cut their ends into one another, as well as causing increased cracking the pipe ends at the start of rolling.

The purpose of the invention is to eliminate the disadvantages mentioned above.

The invention is based on the object.
To create a rolling mill for cold rolling thin-walled tubes, which reduce the sliding of the caliber on the tube to be rolled and the cutting of the ends of the tube to be rolled and the butting tube into one another as well as cracking of the tube

Eliminate ends at the start of rolling permitted,
at

This will be a 1If ⁷ rolling mill for cold rolling thin-walled

Pipes., Which a roll stand,. with bearings

the pipe to be rolled unrolls "and this deforming" WaI-

with the/

zen with calibres of variable cross-section, / end gears M placed on Ί / l rabbets for the reciprocating movement

with
supply of the frame and rollers, and racks,

on which the final gears roll and the position of the
Fix rollers, as well as a L'otcr to a drive of the whole »Valzwexkt uiii

tine feed and turning device for the α v..ocx to be rolled

309883/0817

_ 3 -

achieved by the fact that the invention includes the racks

. the "
(longitudinal displacement Ikb / in directions of movement of the scaffolding

at during the whale ζ ν or gangs between the caliber and the ζυ. rolling pipe occurring frictional force -of. critical value

- if the rolling radius of the pass changes / aii ^ - are
arranges, wherein a device is connected to the racks, which ensures the return of the racks in the original position after removal of the load resulting from the frictional force.

Is beneficial. ,. the device for returning the racks to their original position in the form of a damping device provided with springs auge.fühit., & ± _{e is} connected to these racks.

it

This allows the racks to move during the deformation of the pipe under the action of natural frictional forces to move according to your law of the variable rolling radius and to compress one of the springs of the damping device and, after the deformation has ended, to the original one Return position, which minimizes the sliding friction of the caliber on the tube during rolling.

The device for returning the racks to the original position is expediently called ^ /> Socks formed (connected to these racks) · what can also reduce the sliding friction of the caliber on the pipe during ■ .Valzen to a minimum.

309883/0 ^; H7 ORIGINAL BATHROOM

According to the present invention, a rolling mill for cold rolling thin-walled and extremely thin-walled tubes was created, which has the following advantages: the rolling mill output increases by 2 to 3f see, the number of intermediate operations in the preparatory work is reduced by 25-35%, the The decrease in diameter increases up to 50% and the decrease in thickness of the wall - up to 75%

In the further the invention is explained by embodiments and drawings; show in the drawings

1 shows a schematic representation according to the invention executed rolling mill for cold rolling thin-walled Hohrenm partly in section;

Fig. 2 is a plan view;

Pig. 3 and 4 the device for shifting the racks with the use of a spring damper;

5 and 6 the device for shifting the racks using a cam.

The rolling mill shown in Figures 1 and 2 for V / alzen of thin-walled and extremely thin-walled pipes has a roll stand 1 of rectangular cross-section, which on Rollers 2, by means of which the roll stand can move unhindered back and forth · In the upper and in the lower Part of the frame 1 are support plates 3 made of hardened steel, along which the rollers 4 move

3 09883/0817

The Gerrit ü is the working main me chani sinus of the rolling mill, in which the deformation of the pipe by means of the rolling tools. - the rollers 4 and a mandrel 5 - takes place

A ring caliber 6 is variable on the rollers 4. Cross-section turned and ground »In development it is conical ", which ensures the deformation of the pipe diameter and wall thickness during rolling To set and adjust the rollers 4 are in the upper and

in the lower part of the frame 1 wedges 7 attached, with their

to each other

Help the support plates 3 approached or removed from each other can be.

Spur gears 8 are placed on two ends of the rollers 4, which connect the two rollers 4 to one another and ensure that they run synchronously. Except these spur gears are only on the lower 7 / alze 4 additional drive gears at both ends 9 placed, which in its upper part with racks 10 and in the lower part with movable racks 11, which are mounted in the roll stand 1 are in engagement

One end of the racks 10 is attached to a damping device 12 with springs 13. The racks 11 are immovably attached to the frame 1, but can move back and forth together with the frame 1.

In J? Y. 3 and 4 is the damping device 12 with ' closer

Tension springs 13 are shown. The direction of movement is indicated by arrows of the racks on the back and forth of the

309883/0817

Scaffolding indicated.

In the rear rolling mill part (seen in Walzricircung) is located a rotating and feeding device 14 for the Kohr to be rolled, which per double stroke of the frame 1 the feed and the rotation of the head only in the rear position or also separated, namely the feed in the rear position and the rotation of the pipe in the front position. and feed device has the usual design, as it is used in the standard drilling cold rolling mills.

There is a stop at the far end of the rolling mill 15 for a rod 16, which is used for attachment and adjustment the position of the conical mandrel 5 in the deformation zone is determined. The mandrel 5 is attached to the front end of the rod 16 by means of screw threads.

On the rod 16 with the attached mandrel 5 is in front of the V / alzen an Eohr 17 pushed on and with the help of the turning and Feed device 14 brought into the deformation zone

On the front side of the frame 1 are two eyelets 1ü present, which are connected to connecting rods 19, the opposite ends of the connecting rods with crank pins 20 are connected, which are firmly pressed into the disks of crank gears 21.

Via elastic V-belts 22, the gear 23 of the rolling mill is connected to a direct current motor 24, which is a controllable one Speed possesses connected.

309883/0817

All units and parts of the rolling mill are on a solid metal plate 25 mounted.

Instead of the spring shock absorber 13 for the displacement of the rack 10 may be one of the embodiments svar en iant a ITokkengetriebe 26 ^ it as in Fig. 5 mid 6 is ready to be used. In this case, the racks are moved by an eccentric cam 27 via shoulders 28 in accordance with the displacement of the caliber 6 of the rollers 4 according to the natural (variable) rolling radius. The direction of rotation of the cam 27 ″ and the rollers 28 and the direction of movement of the racks are indicated by arrows.

The described rolling mill operates as follows.

Before starting work on the rolling mill, the Viialz tool - the rollers 4 and the mandrel 5 - is installed in the 7 / roll stand 1, whereby Oi (SiS tool is selected according to the specified calibration and adjusted for orientation. After this, the The tube 17 is pushed on and fastened in the usual way in the rotating and advancing device 14. The motor 24 is then switched on and rolling is started at low speed They also enable them to rotate the crank pins 20. The connecting rods 19 connected to the pins move the frame 1 in and out, together with the movement

309883/0817 _{BA & OR1G1NAL}

In the stand 1, the rollers 4 also move by rotating through an angle of approximately 360, the diameter of the caliber 6 when going into Rohrhewegungsricircung according to the specified calibration from the maximum to the minimum, the dimension of the finished pipe 1? should decrease in size. During the movement of the stand 1, the rollers 4 are forcibly shifted on the support plates 3 as a result of the engagement of the pinion drive gear 9 with similar racks 10 and 11.

While the rolling mill is idling, the Rack 10 immobile and the displacement of the rollers 4 takes place without axial forces. Therefore the spring damper is 12 not burdened. But from the moment you dov roll the Tube 17 begins to occur on its surface in the deformation zone because of the different rolling radii in the longitudinal direction of the working caliber 6 natural axial frictional forces between the ear 17 and the caliber 6, which endeavors are to move the racks 10 in both directions. These axial frictional forces are all the more important the greater the difference in the rolling radii of the caliber 6, i.e. the greater the conicity of the pipe to be rolled in the Deformation zone is.

These axial frictional forces should be eliminated, as they cause considerable malfunctions in the rolling mill:

3 09883/0817

the calibers use .sich, faster, the loads on the racks 10 and 11 increase, it comes to. Eissigwei-uo ^ the ends of the tube 1? and for cutting the ends of the tubing to be rolled and the butting tube into one another. The elimination of the frictional forces is achieved by the illustrated in Fig. 3 ¹ ^ d $ spring damper 13. The work of the damper is that, under the action of the axial frictional forces, the racks 10 move along the rolling axis and compress the springs 13 in one direction or the other depending on the back and forth of the frame. As a result, the variable frictional forces arising between the caliber 6 and the pipe 17 to be rolled are eliminated over the entire length of the potash. As soon as the rolling is finished, the caliber releases the tube, the effect of the frictional forces ceases and the springs 13 of the damper bring the racks 10 back into the central starting position. The directions of displacement of the racks 10 are indicated in FIG. 3 by arrows.

Instead of the spring damper 13, a cam gear 26 can be used as an embodiment variant, which is shown in FIGS. 5 and 6. The transmission consists of a acquisitions 29, which is rigidly connected with the racks 10 ". In the frame 29 ^slIld on a shaft 30, an eccentric cam 2? And zv / ei driven rollers 28 are arranged. In the, tlaße, such as the squat nit the shaft 31 of the drive rotates, move

BAD ORIGINAL 30 9883/0817

the driven knobs 28 the racks 10 j back and forth] synchronously with the change in the rolling radius of the caliber 61 The directions of movement of the racks 10 and the direction of rotation of the shaft 31 are indicated by arrows.

Thanks to the use of the damper s 12 or the IT counter gear 26 also eliminates axial frictional forces that occur due to different rolling radii of the caliber.

After each double stroke of the frame 1, the pipe is through the rotating and advancing device 14 advanced by the predetermined amount and rotated to new sections of the pipe except for to roll the specified diameter and the specified wall thickness. The feed and the rotation of the pipe can be separated are carried out: the rotation in the front position and the feed in the rear. The task of the rotating and forward thrust device 14 consists in giving the tube a double stroke to rotate and advance the scaffolding evenly.

At the rear stop 15, the rod 16 is immovable attached to the mandrel 5, on which the tube dipped down will. The latter is tapered in order to facilitate the drainage of the pipe from the mandrel.

After rolling the front end of the pipe on a low

he

Length, the correctness of the setting is checked and, if necessary, the setting is corrected. If the setting is found to be correct, the entire tube is rolled.

309883/081 7

Claims (3)

July 4, 1972 L / Brr PATEN Ϊ CLAIMS i 1. j rolling mill for cold rolling thin-walled tubes, the β ι ^v - ~ s on the ■ § j a working scaffold,. with bearings for the tube to be rolled abc.vj rolling and deforming rollers with calibres changeable ^ω Κ with the H / Cross-section, on rollers / end gears ■ for the reciprocating movement of the stand and the rollers and racks on which the final gears roll and fix the position of the rollers. " soiie a solder or to drive - / the whole rolling mill and a feed and turning device for includes the pipe to be rolled, characterized by that the racks (10) _ .. ' the
in the directions of movement of the scaffold (1) during the rolling process between the caliber (6) and the to rolling tube (17) occurring frictional force of kr it i ropes - ■ if the rolling radius of the pass (6) changes, svers moveablej ^ iaa)
^ arranged ^; and that with 'the toothed racks (10) a device is connected (12 or 26) which ensures the return of the toothed racks (1C) to the original position after removal of the load resulting from the frictional force. 2. V / alz'n'erk according to claim 1, characterized in that that the device for recirculation ...? i · 30988? / 0817 Racks in the original position in the form of a nothing blaze (13) v-enr- ^ see damping device (12) executed
is connected to these racks (10). 3. Rolling mill according to claim 1, characterized in that the device for returning the Racks in the original position is designed in the form of a cam (27) which is connected to these racks (10)