JPH0237441Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the field of rolling, and more particularly to a stand for a pipe cold rolling mill. The invention can be used in a rolling mill having a movable roll stand and two pairs of rolls arranged in tandem therein, and is intended to cold-roll pipes of all standard dimensions.

[Conventional technology]

A large number of pipe cold rolling mills with two-stage stands are currently used in the metallurgical industry. However, these rolling mills are characterized by relatively low output. Therefore, the problem of modernizing the existing rolling mills was raised.

The proposed stand can be used in place of the widely used two-tier stand in current pipe cold rolling mills.

Known from the prior art are stands for multi-standpipe cold rolling mills (USSR Inventor's Certificate No.
No. 273144 (IPC B21B 21/00, published June 15, 1970).

The stand has a body housing therein two pairs of rolls arranged in tandem. The roll is equipped with a drive. This drive has two fixing racks arranged on different sides of the stand. The rack is kinematically related to two drive pinions of the lower roll, mounted on its neck on different sides of the stand. Additionally, the drive incorporates synchronizing gears for synchronously rotating each pair of upper and lower rolls. A gear is attached to the neck of each pair of rolls. The stand is also provided with a wedge mechanism that adjusts the rack in the longitudinal direction when installing the roll. The rack and wedge mechanisms are located in difficult to reach locations for maintenance and adjustment.

This arrangement of rack and wedge mechanisms results in longer outages caused by stand adjustments, which reduces the overall output of the mill.

This fact that a given stand has two pairs of rolls makes it possible to increase the output of the pipe cold rolling mill compared to a two-tier stand. However, these stands can only be used when new multi-strand pipe cold rolling machines designed to roll pipes from light metals and alloys are manufactured, and the current It cannot be used to modernize single strand rolling mills.

Also, because the racks of these stands are arranged on both sides of the stand above the drive pinion of the lower roll, they cannot be used to modernize current two-high pipe cold rolling mills. As a result of this design, the overall width of the stand increases,
This makes it impossible to install the stand in current two-stage pipe cold rolling mills.

In this given stand, each pair of rolls rotates by its own rack.

This kinematic coupling results in unequal vertical and axial loads acting on the meshing of the first pair of lower rolls with their racks and the meshing of the second pair of lower rolls with their racks.

According to an embodiment of such a roll drive device,
When the engagement between the drive pinion and the rack produces an overturning moment in each pair of rolls that is opposite in direction and of a different value to the moment of the other pair;
During the rolling process, an overturning moment of the stand is generated in a plane perpendicular to the rolling axis. If the rolling moment on the pair of blooming rolls is twice the value of the rolling moment on the pair of sizing rolls, the value of the resulting overturning moment scale is maintained. This moment causes the stand to warp during the reciprocating process of the stand, and an additional load is applied to the guide section and drive device of the rolling mill housing. reliability is reduced.

Known from the prior art is a stand for a pipe cold rolling mill (West German Patent No. 2528850 (IPC
B21B 21/00, published January 18, 1979)). The stand includes a body housing two pairs of rolls arranged in tandem. The roll is equipped with a drive. This drive has four fixing racks arranged in pairs on different sides of the stand. These racks are kinematically related to four drive pinions mounted on the end necks of the upper drive rolls. Additionally, the drive has eight synchronizing gears associated with each pair of upper and lower rolls attached to the necks of all the rolls on both sides of the stand. The stand is provided with brackets for securing the racks in pairs on different sides of the stand, and a wedge mechanism for adjusting the racks longitudinally during roll installation.

Additional cantilever brackets locate the two racks in a row on each side of the stand and the wedge mechanism used to move the racks when adjusting the stand.

Due to the fact that only the upper roll is driven, the rack and wedge mechanisms are located in a location that is more accessible for adjustment and maintenance than those of the stands described above.

However, the increased number of gears in the roll drive and the overall width of the stand when compared to the previously described stands results in an increase in the moving mass of the pipe cold rolling mill and the power of the main drive.

Significant axial dynamic loads occur during the pipe rolling process, resulting in failure of the wedge mechanism and additional brackets. The reliability of this given stand is therefore low.

Additionally, the significant overall width of the stand increases the overall size of the housing housing the roll stand. This given stand therefore cannot be used to modernize current pipe cold rolling mills.

Due to the large number of meshing gears (up to 8), considerable time is required to adjust the stand after changing paths and replacing worn gears, racks and rolls. As a result of spending time adjusting the stand, the rolling mill downtime becomes longer and its output is reduced.

[Problem that the invention attempts to solve]

The present invention essentially aims to improve the operational reliability and output of pipe cold rolling mill stands and to make it possible to use the proposed stand in modernizing existing pipe cold rolling mills. , aims to provide a stand for a pipe cold rolling mill equipped with a roll drive device.

[Means for solving problems]

This purpose consists in internally moving two pairs of rolls in tandem, a first and a second, with a drive incorporating fixed racks arranged on different sides of the stand and a drive pinion kinematically related to said racks. a synchronizing gear associated with each pair of upper and lower rolls and disposed on the neck of each roll on one side of the stand; and a connecting gear disposed on the other side of the stand. According to the present invention, a cooling pipe is provided, in which a drive pinion is attached to the end neck of the first pair of upper rolls, and a connecting gear is attached to the neck of the first pair of upper rolls and the neck of the second pair of lower rolls. This is achieved by providing a stand for the rolling mill.

Such an embodiment of the stand of a pipe cold rolling mill makes it possible to increase the reliability of the stand and the overall output of the rolling mill.

Since the external load generated in the horizontal plane by the rolling moment is symmetrical about the stand axis, it does not cause the stand to warp. The reaction forces in the vertical plane resulting from the engagement of the rack and pinion are also symmetrical and balanced by the gravity of the stand upwards, which reduces the frictional forces created in the guide when the stand is in motion. do.

Due to the fact that only one roll is being driven in this given stand, the proposed four-tier stand does not require much time to adjust the rolls when changing gears and racks; As a result, the downtime is shortened and the overall output of the rolling mill is increased.

A minimally sufficient number of gears (up to 8) for rotating the four rolls ensures synchronous rotation in each pair of rolls and the desired set relationship of deformation in each pair of rolls.

Furthermore, due to the fact that in the proposed stand only the upper rolls of the first pair are driven and the rolls of the second pair are rotated by the first pair;
The overall dimensions of the stand do not exceed the overall dimensions of current two-tier stands of pipe cold rolling mills and can be used to modernize current rolling mills currently in use.

〔Example〕

The stand of a pipe cold rolling mill comprises an open top body 1 (Fig. 1) with separators 2 and 3 (Fig. 2) mounted on a guide section of a pipe cold rolling machine housing (not shown). ing. Two pairs of rolls 4, 5 and 6, 7 are housed in tandem inside the main body 1 (FIG. 1). The first (blister) pair incorporates an upper roll 4 and a lower roll 5. The second (sizing) pair incorporates an upper roll 6 and a lower roll 7.

Each roll 4 (FIG. 1), 5 and 6, 7 is connected to the
Installed in the four yoke 8 (Fig. 3), 9, 10, 11 and 12 (Fig. 4), 13, 14, 15.

An annular path with grooves of variable longitudinal cross-section is formed in each pair of rolls 4 (FIG. 3), 5 and 6 (FIG. 4), 7 between jocks 8 (FIG. 3), 9 and 10, 11;
It is also installed between 12 (Fig. 4), 13 and 14, 15. i.e. paths 17 (Fig. 3) and 1
8 is a block pair, paths 19 (Fig. 4), 20
is in the sizing pair.

Passes 17 ( Figure 3), 18 and 19 (Figure 4), 2
A screwing device 21 (FIG. 1) is provided which serves to set a predetermined gap between 0 and 0.

The roll is equipped with a drive.

Two drive devices are installed on different sides of the stand.
It incorporates two fixing racks 22 (FIG. 2), 23. These racks 22, 23 are secured to the housing of the pipe cold rolling mill with the aid of a wedge mechanism (not shown).

The racks 22 and 23 are kinematically associated with drive pinions 24 and 25 mounted on the end necks of the upper parting rolls 4 of the parting pair.

In another embodiment of the drive, the drive pinions 24 and 25 are connected to the upper roll 6 of the sizing pair.
It may be attached to the end neck of the

In addition, the drive device consists of four synchronous gears 26 (Fig. 5), 27, 28,
It incorporates 29. Synchronous gears 26 and 27 are mounted on the necks of blooming rolls 4 and 5, and synchronized gears 28 and 29 are mounted on the necks of sizing rolls 6 and 7. These synchronous gears 26, 27,
28, 29 serve to ensure synchronous rotation of the paired blooming rolls 4, 5 and sizing rolls 6, 7.

Furthermore, the drive incorporates two coupling gears 30, 31 (FIG. 1) arranged on the other side of the stand. One coupling gear 30 (drive) is attached to the neck of the upper drive roll 4 of the blooming pair, and a second coupling gear 31 (driven) is attached to the neck 7 of the lower roll of the sizing pair.

In yet another embodiment of the drive, one coupling gear 30 (drive) may be attached to the neck of the upper drive roll 6 of the sizing pair. In this case, the second connecting gear 31 (driven) is the lower roll 5 of the blooming pair.
shall be attached to the neck of the person.

According to this embodiment of the stand of the pipe cold rolling mill, the load generated during the process of rolling the pipe by the rolls 6 and 7 of the sizing pair is transferred by the connecting gears 31 and 30 to the upper part of the blooming pair. By transmitting the power to the roll 4, it is possible to improve the operational reliability of the stand. 2 provided on the neck of the upper roll 4 on different sides of the stand.
By means of two drive pinions 24 and 25, two fixing racks 2 arranged on different sides of the stand
It is possible to divide the total external load symmetrically between 2 and 23, which ensures smooth and reliable operation of the stand without deflection. This makes it possible to increase the pipe rolling speed, which overall results in an increase in the output of the pipe cold rolling mill.

Also, due to the fact that only one upper roll 4 is driven in the proposed stand, the time required for adjustment of the rolls after replacing all gears and two racks in the proposed four-tier stand is considerably shorter. , which reduces downtime and increases mill output.

The overall width of the proposed four-tier stand corresponds to the overall width of each of the current two-tier stands, and the configuration of the drive pinions 24 and 25 allows this given stand to be replaced with the current two-tier stand without any capital outlay. It can be used to modernize.

The stand operates in the following manner.

The main drive device of the pipe cold rolling mill reciprocates the stand body 1 along a guide portion of a housing (not shown). Drive pinions 24 and 25, associated with fixed racks 22 and 23 attached to the upper roll 4 of the blooming pair, rotate the upper roll 4 under the action of the moving stand.

From the rolls 4 rotation is transmitted via synchronizing gears 26 and 27 to the lower roll 5 of the blooming pair, and via coupling gears 30 and 31 rotation is transmitted to the lower roll 7 of the sizing pair. From the lower roll 7 of the sizing pair rotation is transmitted via synchronous gears 29 and 28 to the upper roll 6 of the sizing pair.

Thus, when the stand moves forward, all four rolls 4, 5, 6 and 7 are rotating in one direction, and when the stand moves in the opposite direction, the rolls rotate in the other direction. The material is then rolled by passes 17, 18 of the blooming pair of rolls 4 and 5 and by passes 19, 20 of the sizing pair of rolls 6 and 7.

The proposed structure of the stand of a pipe cold rolling mill makes it possible to improve the operating reliability and output of the stand. Furthermore, the proposed stand can be used to modernize existing pipe cold rolling mills.

The material deformation achieved primarily in passes 17, 18 of the blooming pair of rolls 4 and 5, and the material deformation achieved in passes 19, 20 of the sizing pair of rolls 6 and 7, is largely due to the precise The fact that the geometry is to be obtained allows the proposed four-tier stand to be used for rolling high-precision pipes.

[Effect of idea]

The present invention can be most effectively used to roll precision pipes of all standard sizes.

[Brief explanation of the drawing]

Fig. 1 is a view from one side of the stand of a pipe cold rolling mill according to the present invention, Fig. 2 is a top view thereof, Fig. 3 is a sectional view taken along the line - of Fig. 1, and Fig. 4 is a view of the stand of the pipe cold rolling mill according to the present invention. FIG. 5 is a cross-sectional view taken along line - in FIG. 1, and FIG. 5 is a view from the other side of the stand of the pipe cold rolling mill according to the present invention. 1...Main body, 2, 3...Separator, 4...Upper roll of the bloomer pair, 5...Lower roll of the bloomer pair,
6... Upper roll of sizing pair, 7... Lower roll of sizing pair, 8, 9, 10, 11, 1
2, 13, 14, 15...Roll chock, 1
6... Anti-friction bearing, 17, 18... Blooming pass, 1
9, 20... Sizing pass, 21... Screw fastening device, 22, 23... Rack, 24, 25... Drive pinion, 26, 27, 28, 29... Synchronization gear, 30, 31... Connection gear.

Claims (1)

[Scope of utility model registration request] Fixed racks 2 placed on different sides of the stand
2, 23 and drive pinions 24, 25 kinematically associated with said racks. The housing body 1 and each roll 4, 5 on one side of the stand,
Each pair of upper rolls 4, 6 disposed on the necks of 6, 7
and synchronous gear 2 connecting lower rolls 5 and 7
6, 27, 28, 29 and connecting gears 30, 31 disposed on the other side of the stand, the drive pinions 24, 25 are connected to the first pair of drive pinions 24, 25. The connecting gears 30 and 31 are attached to the neck of the first pair of upper rolls 4 and the neck of the second pair of upper rolls.
The above-mentioned stand is attached to the neck of the pair of lower rolls 7.