DE2260541A1 - WORKING STAND OF A DISK ROLLING MILL - Google Patents

Description

1) Pervoural'skij novotrubnyj zavod
Fervouralsk / USSR

2) Elektrostal'skij zavod tjazelogo masinostroenija Elektrostal '/ USSE

P 43 791/2

December 11, 1972

BK / Br

Work stand of a disc piercing mill

The invention relates to the rolling of round products, in particular to working stands of cross-rolling mills, preferably for the production of seamless tubes, including punching, rolling, smoothing * expanding, calibrating and straightening, of the pipes.

It is the work frame of a tube saw mill known that from a stand with barrel-shaped or mushroom-shaped Rollers (shoulder rolls), guides for holding the pipe on the rolling line and device for regulating the roll gap as well as drive with motors, gears and ball joint spindles for the transmission of the rotary motion to the rollers, their Axis position can be changed spatially, exists.

A09826 / 0AS6

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In this known work stand that is between two, three or "who rolls, whose axes are inclined to the rolling line, running pipe is set in a helical movement. The inclination winM determines. between roll axes and rolling line the angle of this helical movement of the tube and thus the rolling speed; the angle of inclination can be due to Design features of the ball joints of the spindles should not be assumed to be greater than 12-14 °.

The mentioned cross-rolling mills are burdened with the following disadvantages:

-The maximum angle of inclination of the rolls in these rolling mills cannot be assumed to be greater than about 12-14 °, which means that the Rolling speed is limited;

-The ratio of the width of the contact surface (between tube and rollers) to the tube diameter is in these rolling mills too small (0.2-0.25); this leads to uneven deformation, what a premature destruction of the metal in an axial zone of the rolling stock and defects such as rolling skin, Peeling etc. on the inner surface of the pipe conditional.

-the round shape of the pipe to be rolled is distorted in such rolling mills, which eliminates the pipe wall reduction in thin-walled Pipes leads;

-the spindle ball joints break too often when the angle is set between the roller axis and the rolling line from about 12 to 14 °,

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TJm by increasing the angle of the very cave-like movement to increase the rolling speed while reducing the skew angle in spindle ball joints, one uses In the known work frame, individual drives for each roll that is inclined to the rolling line. But the application of such individual drives signifies a major complication of the scaffolding; this increases the weight and the dimensions of the Scaffolding and complex electrical devices are necessary for synchronizing engine speeds.

It is also known the work frame of a piercing mill, that consists of a stand with discs, guides to hold the rolling stock on the rolling line and a device for gap control between the work surfaces of the panes as well as one There is a drive (motor and gear) for the rotary movement of the discs.

In this known work frame of a disk piercing mill, the fiohr to be rolled is set in a screw-like movement as it passes between the end faces of two disks below or above the horizontal plane in which the disk axes lie. The variable distance from this horizontal plane, known as eccentricity, allows the angle of the screw-like movement of the pipe to be changed in the range from 9 to 13 °. The eccentricity can change and the rolling speed can be regulated by mn. Change the distance between guides and

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Horizontal plane in which the shaft axes of the disks lie. The essential change in the eccentricity leads to the kinking of the rolling line in the vertical plane, which increases the stability of the rolling process and the dimensional accuracy of the pipes deteriorated. In addition, the ^ A-axes of the disks are in this In a plan view, the stand shifted somewhat in the rolling direction, which makes the deformation zone kinematically asymmetrical. The kinematic Asymmetry prevents the increase in the eccentricity and therefore also the rolling speed by increasing the Angle of helical movement. The kinematic asymmetry the deformation zone also causes an increase in the wall thickness difference and the spiral-like deviations (twisting) of the pipes and demands large for stable rolling Reduction of stitches, which are used to develop defects, such as rolling skin flakes etc. on the inner surface of the pipe to lead.

There is also known the work stand of a disk piercing mill which includes the same elements as the last one described Stand, but the disks are symmetrical here in a plan view of the horizontal plane in which the rolling line lies arranged on both sides of the rolling line; the shaft axes of these disks are in two planes, which are at the same constant distance (with fixed eccentricity) lie on both sides of the horizontal plane, arranged. The deformation zone is in this work frame kinematically symmetrical, what favorable conditions

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for the stable rolling of pipes with high dimensional accuracy. But that of the contraction of the work scaffolding unintended possibility of the size of the eccentricity To change, the rule long prevents the rolling speed by changing the angle of the screw-like tube movement. Such a regulation of the rolling speed is in the manufacture of pipes of different dimensions, diameters and wall thicknesses made of different types of steel are necessary,

The invention is based on the object of developing a work stand for cross-rolling mills, the e ± E full / kinemet.tische Ensures symmetry of the deformation zone and thus that the following allowed:

-Performing the rolling process when in terms of physical Metal properties of the pipe to be rolled, maximum permissible angle of the screw-like pipe movement, magnification the rolling speed and avoidance or reduction of the development of defects on the inside wall surface of the tubes; - Significant reduction of the oblique angle in the ball joints of the drive spindles, so that it does not exceed 10 ° at makes any angles of the helical tube movement; -Guarantee a stable rolling process for larger ones Helical movement angles, improving the quality of the inner wall surface and increasing the / pipe dimension accuracy by increasing the ratio of the width of the contact surface the deformation zone to the diameter of the to be rolled Rohres (0.3-0.4) ·; 409826/0450

-Regulation of the rolling speed by changing the angle of the screw-like guide movement depending on the diameter and wall thickness of the tubes to be rolled from different steels;

-Rolling thin-walled tubes with a ratio of Diameter to wall thickness up to 30.

It is the work frame of a cross rolling mill with disks, the plan view of a plane in which the rolling line lies are arranged in mirror image (symmetrical) to this rolling line, proposed whose shaft axes are in two planes located at the same distance from the plane of the rolling line on both sides thereof. The work scaffolding exists from a stand with disks arranged therein, guides for holding the rolling stock on the rolling line and a device to regulate the distance between the working surfaces of the discs and a drive. The disk shafts are according to the Invention rotatable about the axes that are parallel to the shaft axes of the disks and at the same distance from them, arranged, When they rotate, the distances between the planes in which the shaft axes of the disks are located change by the same amount and the rolling line. This also changes the angle of the screw-like tube movement and the rolling speed.

It is useful to use the device for changing the distance between the parallel planes in which the shaft axes of the Discs lie, and form the rolling line with drums. These drums are arranged on the stand so that they can rotate about their axes.

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The disk shafts lie parallel in the drums and with equal eccentricity to their axes.

The device according to the invention ensures the following:

- the greatest possible rolling speed and the possibility of regulating the screw-like tube movement to achieve this rolling speed by the largest possible (in terms of physical metal properties) angle of helical movement of Pipes of various dimensions (diameter, wall thickness), made from steels of various grades;

- stable rolling process at the largest possible angle of the helical Pipe movement;

-Limitation of the oblique angle in the ball joints of the spindles with 10 ° at any angle of the screw-like tube movement ;

-Reduction of the pipe wall with such a ratio of the diameter to the wall thickness (up to 30), that in the known cross rolling mills not possible;

-high pipe dimension accuracy and good quality of the inner surface.

The work frame of the disc piercing mill is by small Marked weight and small dimensions, has a simple, reliable and convenient construction, ensures a high efficiency and a better quality of the pipes regarding the inner surface and dimensional accuracy of diameter and wall thickness.

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The invention is explained using an exemplary embodiment and the drawing. Show it

Fig. 1 the work frame of a disc piercing mill, the is carried out according to the invention (view along the rolling line);

Fig. 2 the same (top view);

3 shows the diagram of the mutual arrangement of the working disks, their shafts and the tube to be rolled different positions of the rotating drums

The working frame (Fig. 1 and 2) of a disc piercing mill contains a stand 1 with columns 2 on which the rotatable drums 5 with toothed segments 4, engaging with the Drives 5 of the drum rotation are arranged. A turn of your own To prevent the drums, a locking device 6 is provided. Inside the drums 3 are eccentric and parallel to their axes 7 »which also serve as axes of rotation for the drums, in bearings 8,9 and 10, the Shafts 11 of the working disks 12 are arranged. The bearings 8 are in smooth cylinder liners 13 and the bearings 9 and 10 in Cylinder liners 14, which at one end with sawing external threads are provided. Adjusting nuts 15 are screwed onto this buttress thread of the cylinder sleeves 14, the outer projections 16 enter into recesses 17 of the columns 2 of the stand 1. The adjusting nuts 15 are used for the spacing between the Working surfaces (end faces) 18 of the disks 12 and take the rolling force via shafts 11, bearings 9 and cylinder liners 14

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directed along the axes 19 of the working disk wedges are. This rolling force is transferred to the stand. They bearings 10, which are fastened to the shafts 11 with nuts 20 prevent the axial fluctuations of the shafts 11.

To hold the pipe 21 on the rolling line 22, are between the end faces 18 of the disks 12 guides 23 are provided, a rotation of the shafts 11 with the disks 12 is used Motor 24, a limit torque clutch 25, a main spindle 26, a coupling 28 with elastic elements, gears 28 and 29, transmission shafts 30 with couplings 31 and ball joint spindles 32. In order to ensure the required direction of rotation of the disks, the gear 28 has two stages and the gear 29 one stage with the same gear ratios in the two transmissions.

The shafts 11 of the disks 12 are mirror images (symmetrical) on both sides in the plan view of the horizontal plane the rolling line 22 is arranged. The axis of one disk is in the horizontal plane, the one above the rolling line is, and the axis 19 of the other disk in the horizontal plane, which is the same distance below the rolling line.

The working scaffold works as follows. With the help of the drives and the toothed segment 4- the drums 3 are rotated and placed in a position in which the axis of one disc

: ■■ - ■■■. -Ϊ10-

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lies above the rolling line 22 with a predetermined eccentricity and the axis of the other disk at the same distance is below the rolling line 22. The eccentricity gets so big

Metal·

as possible, depending on the physical properties, Dimensions, the diameter and the wall thickness of the pipe are set. Turn the adjusting nuts 15 the cylinder liners 14 with bearings 9 and 10 and the shafts 11 with bearings 8, cylinder liners 13 and discs 12 along the Axes 19 moved until the predetermined distance between the end faces 18 of the working disks 12 is achieved · The shafts 11 with the disks 12 are driven by the motor 24 via a limiting torque clutch 25, main spindle 26, coupling 27 with elastic elements, Gears 28 and 29, transmission shafts 30 with clutches 31 and ball joint spindles 32 rotated.

The working disks 12 rotate in mutual directions; because the one oiler axes 19 of the shafts 11 over the Rolling line 22 by the size of the eccentricity and the other below this rolling line at the same distance moves that rolled between the end faces 18 of the working disks and pipe held on the rolling line 22 with guides 23 helically along this rolling line. The rolling direction depends depends on the direction in which the discs turn.

If the pipe dimensions (diameter or wall thickness) and the steel types are changed, the rolling speed must be increased Regulate the change in the angle of the screw-like tube movement.

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Such a regulation of the rolling speed is carried out by turning the drums 3 made about their axes 7, the Angle of helical tube movement changes. In Fig. 3, the scheme of the mutual arrangement of the working disks, their shafts and the tube at different angles of rotation of the Drums shown; showing the full (solid) lines the location of the with the smallest eccentricity "(?.".

When the drums 3 rotate about the axes 7, it changes gradually the distance (the eccentricity) between the axes 19 of the shafts 11 of the working disks 12 and the rolling line 22; this also changes the angle of the helical ones Movement and therefore also the rolling speed.

The position of the shafts, disks and drums after the drums have been rotated through an angle which corresponds to the greatest possible eccentricity "€ " is shown in dashed lines.

The work frame of the disc piercing mill has a full kinematic symmetry of the deformation zone because in their any cross-section the circumferential velocity of the one Disc and the tube movement match that of the second disc. This gives pipes with a high degree of dimensional accuracy with a stable rolling process.

In the working scaffold, the deformation zone is in one direction through guide surfaces and in the other direction

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Front surfaces of the disks limited; these areas have a insignificant curvature, resulting in a large width of the contact surface. This reduces the probability a premature destruction in the axial zone of the metal during punching, the distortion of the round is eliminated Form when rolling thin-walled tubes, the pulling force of the disks increases, so that you get the largest possible angle of the screw-like Can apply pipe movement without fear of an unstable rolling process.

As a major advantage of the work scaffolding with the device for rolling speed control by changing the angle of the screw-like tube movement, the constant spatial position of the rolling line for any size of eccentricity. Hda? With becomes a stable rolling process, reducing the Disc and guide wear, etc., increasing the dimensional accuracy of the pipes and simplifying the construction of the Devices for the supply and discharge of the pipes guaranteed.

When testing the work stand of a Seheib piercing mill with the device for regulating the rolling speed by changing the angle of the screw-like tube movement, which is designed with rotatable drums in which the disc shafts are arranged eccentrically and parallel to the drum axes the following was found:

Punching in the manufacture of seamless carbon steel tubes, alloyed and stainless steels takes place at

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Angles of the screw-like tube movement of over 20 ° stable, which is 1.5-2 times larger than "in the conventional β ore rolling mills is;

the punching takes place at rolling speeds that are stable around 1.5-2 »5 times larger than in conventional piercing mills are;

the manufacture of pipes from carbon steels and alloy steels is at a degree of longitudinal deformation of 1.8 to 4-, 5 and off stainless steels with a degree of longitudinal deformation of 1.8 to 3.6 possible;

the rolling out of ears with a ratio of the diameter for a wall thickness of up to 30 and a degree of longitudinal deformation of up to

to 3 is stable;

the rolling out of ears is fortified both on short ones as well as stable on long flying thorns; the regulation of the eccentricity is carried out conveniently and the device for this is simple and reliable.

The work frame of the disc piercing mill is through the best technological possibilities in comparison with all other similar piercing mills.

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Claims (1)

P 4-3 791/2 11 . December 1972 BK / Br Claims 1. Working frame of a disc piercing mill with discs that in a plan view of a plane in which the rolling line lies, are arranged in a mirror image (symmetrical) to the rolling line, whose shaft axes are in two planes, which are equidistant from the rolling line plane on both sides, consisting of a stand with working disks, guides for Holding a pipe on the rolling line and a device for regulating the distance between the working surfaces of the disks and a drive, characterized in that the shafts (11) of the disks (12) are rotatable about the axes (7) are arranged, which are parallel to the axes (19) of the shafts (11) of the disks (12) at the same distance from them and when rotating by the same amount, the distance from the planes in which the axes (19) of the shafts (11) of the disks (12) are located up to the rolling line (22) and thus the angle of the helical movement of the tube (21) and the tube rolling speed change. 2. Working scaffold according to claim 1, characterized in that the device for regulating the distance between the parallel Planes in which the axes (19) of the shafts (11) of the Disks (12) are located, and the rolling line (22) with drums (3) 409 826/0456 "1/ is executed, which are rotatably mounted on the stand (1) about the axes (7), and that in the drums (3) parallel and the shafts (11) of the disks (12) are arranged with the same eccentricity to their axes (7). 409826/0466 Blank page