WO2019092946A1 - Inclined rolling mill - Google Patents

Abstract

Provided is an inclined rolling mill with which adequate working space for ancillary equipment changeover work and installation space for ancillary equipment can be provided. An inclined rolling mill (1) includes a plurality of inclined rolls (2a, 2b, and 2c) disposed at equal intervals around a path line (PL) and a plurality of drive devices (3a, 3b, and 3c) connected respectively to the corresponding inclined rolls (2a, 2b, and 2c). The plurality of drive devices (3a, 3b, and 3c) are disposed so as to be distributed forward and rearward of the incline rolls (2a, 2b, and 2c).

Description

Inclined rolling mill

The present invention relates to an inclined rolling mill used in the production of seamless metal tubes by the Mannesmann method.

In general, the method of manufacturing a seamless metal pipe by the Mannesmann method includes the following steps. The round billet is heated to a predetermined temperature. The round billet is pierced and rolled into an element tube (seamless metal tube). The raw pipe is further drawn and rolled, and further diameter-rolled. In the piercing and rolling process, a piercing and rolling mill (eg, piercer) is used. This piercing mill is a tilt mill.

The inclined rolling mill includes a plurality of inclined rolls and a plurality of drive devices (see, for example, JP-A-2016-55331 (Patent Document 1)). The plurality of inclined rolls are arranged at equal intervals around the pass line, with two or three inclined rolls as one set. The inclined rolls are arranged at an angle to the pass line. The plurality of drives are each connected to a corresponding inclined roll. The drive powers the tilt roll for rotation. All of the plurality of drives are centrally located behind the tilt roll. In some cases, all of the drive units are centrally located in front of the tilt roll. The front of the inclined roll corresponds to the entry side of the inclined roll. The rear of the inclined roll corresponds to the outlet side of the inclined roll.

JP, 2016-55331, A

Around the inclined rolling mill, various jigs and accessory devices (hereinafter, also simply referred to as "attached devices") are installed. It is for producing a high quality raw pipe efficiently. In particular, on the entrance side of the inclined roll, a number of ancillary devices are installed along the pass line. Also on the exit side of the inclined rolls, a number of ancillary devices are installed along the pass line.

Here, the size (example: outer diameter) of the round billet handled by the inclined rolling mill is not limited to one type. Therefore, when the size of the round billet is changed, it is necessary to set up the accessory device such as replacement or adjustment of the accessory device.

However, in the conventional inclined rolling mill, the plurality of drive devices for powering the inclined rolls are all arranged centrally either in front of or behind the inclined rolls. Therefore, it is difficult to secure a sufficient work space for setup change of the accessory device on the side where the drive device is disposed. As a result, it is not possible to easily perform the work of changing the accessory device. In addition, the installation space of the accessory device is limited on the side where the drive device is disposed.

In particular, in a three-roll inclined rolling mill equipped with three inclined rolls, there are more driving devices than a two-roll inclined rolling mill equipped with two inclined rolls. Therefore, in the case of a three-roll inclined rolling mill, the above problems become serious.

One object of the present invention is to provide a tilt rolling mill capable of securing a work space for setup change of an accessory device and an installation space of the accessory device.

An inclined rolling mill according to an embodiment of the present invention includes a plurality of inclined rolls arranged at equal intervals around a pass line, and a plurality of drives each connected to a corresponding inclined roll, and a plurality of drives Are distributed and disposed in front of and behind the inclined roll.

In the inclined rolling mill according to the embodiment of the present invention, since the plurality of drive devices are distributed and disposed in front of and behind the inclined rolls, work space for setup change of the accessory device and installation space of the accessory device are secured. it can.

FIG. 1 is a plan view showing an inclined rolling mill of the present embodiment and the periphery thereof. FIG. 2 is a front view of an inclined roll provided in the inclined rolling mill shown in FIG.

In order to solve the above-mentioned subject, this inventor repeated earnestly examination based on change of an inclination rolling mill. As a result, the following findings were obtained.

As an early inclined rolling mill, a two-roll type inclined rolling mill including two inclined rolls and one drive device has been mainstream. The drive device in this case was disposed in front of or behind the inclined rolls, and the power from one motor was equally distributed to the two inclined rolls by the reduction gear.

As described above, in the two-roll type inclined rolling mill currently put into practical use, a driving device is provided to each of the two inclined rolls. In this case, all of the two drive units are arranged centrally in front of or behind the inclined rolls, following the form of the initial two-roll inclined rolling mill. By the same idea, in the case of a three-roll inclined rolling mill, all three drive devices are arranged centrally in front of or behind the inclined roll.

Moreover, in the case of an inclined rolling mill equipped with a cone-shaped inclined roll, all the drive devices are often disposed behind (outgoing side) the inclined roll. This is because if all the drive devices are disposed on the inward side (forward) of the inclined roll, interference between the drive devices can be expected. In other words, the conventional design is based on the idea that all the drive devices are arranged concentrated on either the front or the rear of the inclined roll.

Therefore, the present inventors repeated studies on inclined rolling mills having a plurality of inclined rolls (e.g., two-roll type inclined rolling machines, three-roll type inclined rolling machines) without being bound by conventional design concepts. . As a result, we have reached a new design concept of distributing a plurality of drive devices in front of and behind the inclined roll.

The inclined rolling mill of the present invention has been completed based on the above findings.

An inclined rolling mill according to an embodiment of the present invention includes a plurality of inclined rolls and a plurality of drive devices. The plurality of inclined rolls are equally spaced around the pass line. The plurality of drives are each connected to a corresponding inclined roll. A plurality of drive devices are distributed and disposed in front of and behind the inclined rolls.

For example, in a two-roll inclined rolling mill, the number of inclined rolls is two and the number of driving devices is two. The two inclined rolls are arranged at 180 ° intervals around the pass line. The drive of one of the two drives is arranged in front of the inclined roll and the remaining drives are arranged behind the inclined roll.

For example, in a 3-roll inclined rolling mill, the number of inclined rolls is three and the number of driving devices is three. The three inclined rolls are spaced at 120 ° intervals around the pass line. One or two of the three drives are located in front of the tilt roll and the remaining drives are located behind the tilt roll.

In the inclined rolling mill according to the embodiment of the present invention, a plurality of drive devices are distributed and disposed in front (inside) and back (outside) of the inclined roll. That is, not all of the plurality of drive devices are concentrated at one of the front and rear of the inclined roll. Therefore, the work space for setup change of an incidental apparatus can be secured. As a result, it is possible to easily perform the work of changing the accessory device. Moreover, the installation space of an incidental apparatus can be secured.

The drive powers the tilt roll for rotation. For example, the drive includes a drive shaft connected to the tilt roll and an electric motor connected to the drive shaft. A universal joint may be provided between the tilt roll and the drive shaft. A universal joint may be provided between the drive shaft and the motor.

The main incidental devices installed in front of the inclined roll (inside) are as follows.
Loading device (for example, a loader, kicker): A device for transferring a round billet from the loading table to the pass line.
Pusher: A device for pushing the round billet on the pass line toward the inclined roll.
Billet guide: A cylindrical jig for guiding the round billet pushed by the pusher to a predetermined position on the entrance side of the inclined roll.

The main incidental devices installed at the rear (outside) of the inclined roll are as follows.
Pinch roller: A device for pulling out the formed raw tube from the inclined roll.
Drag out roller: A device for feeding a formed raw pipe on a pass line.
-Burstia: A device for supporting a formed core and core metal.
Carrying-out device (for example, a loader): A device for conveying a formed raw pipe from a pass line to a carrying-out table.

In a typical example, the inclined rolling mill of the present embodiment is used as a piercing and rolling mill in a piercing and rolling process. In addition, before the piercing and rolling process, a constant diameter rolling process may be added in order to adjust the roundness of the round billet. In this case, the inclined rolling mill of the present embodiment is used as a fixed diameter rolling mill in the billet fixed diameter rolling process. Moreover, the inclination rolling mill of this embodiment may be used at the drawing and rolling process after the piercing and rolling process. Furthermore, the inclined rolling mill of the present embodiment may be used in a constant diameter rolling process after a drawing and rolling process. The inclined roll may be cone-shaped or barrel-shaped.

In the case of the inclined rolling mill (piercing and rolling mill) used in the piercing and rolling process, a plug, which is an inner surface regulating tool, is disposed on a pass line. In the piercing and rolling process, a round billet is carried onto the pass line on the entrance side of the inclined roll. The round billet is fed between the plurality of inclined rolls by the pusher and bites into the rotating inclined rolls. Thereby, the round billet is spirally rotated and pierced and rolled by the inclined roll and the plug. The raw tube formed by piercing and rolling is sent on the pass line on the exit side of the inclined roll and is carried out of the pass line.

In the case of the inclined rolling mill (fixed diameter rolling mill) used in the billet fixed diameter rolling process, there is no inner surface control tool. Similar to the piercing and rolling process, in the constant diameter rolling process, the round billet is carried onto the pass line on the entrance side of the inclined roll. The round billet is fed between the plurality of inclined rolls by the pusher and bites into the rotating inclined rolls. As a result, the round billet rotates in a helical manner and is diameter-rolled by the inclined roll. The round billet subjected to fixed diameter rolling is sent onto the pass line on the exit side of the inclined roll and is carried out of the pass line.

In the case of the inclined rolling mill used in the drawing and rolling process after the piercing and rolling process, a plug or a mandrel bar, which is an inner surface regulating tool, is disposed on the pass line. In this case, as in the case of the piercing and rolling process described above, the blank tube is stretched and rolled by the inclined rolls and the plug (or mandrel bar). In the case of the inclined rolling mill used in the fixed diameter rolling process after this stretch rolling process, there is no inner surface control tool. In this case, as in the billet constant diameter rolling process described above, the blank is subjected to constant diameter rolling by the inclined rolls.

As a typical example, in an inclined rolling mill equipped with a cone-shaped inclined roll, the inclined roll is disposed to be inclined with respect to the pass line at a predetermined inclination angle and a predetermined cross angle. In this case, since the inclined roll is given a cross angle, interference between the driving devices is likely to occur on the entrance side of the inclined roll. Therefore, for example, in a 3-roll type inclined rolling mill, two drive devices are disposed behind (outgoing side) of the inclined rolls, and one drive device is disposed in front of (incoming side) the inclined rolls.

However, in the case of a piercing and rolling mill, a large accessory device (for example, Burstia) is installed at the exit side of the inclined roll. In this case, for example, in a 3-roll type inclined rolling mill, it is preferable that one drive device is disposed behind (outgoing side) the inclined roll and two drive devices are disposed forward (incoming side) of the inclined roll. In addition, when a number of additional devices are installed on the exit side of the inclined roll than on the entry side of the inclined roll, for example, in a 3-roll type inclined rolling mill, one drive unit is disposed behind (outside) the inclined roll Two drive devices may be arranged in front of the inclined roll (inside). In short, the distribution of the plurality of drive devices can be appropriately set in accordance with the installation state of the accessory device around the inclined rolling mill, and the layout of the entire equipment including the inclined rolling mill and the accessory device.

As a typical example, in the three-roll inclined rolling mill, the first inclined roll of the three inclined rolls is disposed directly above the pass line (upward in the vertical direction). However, the positions of the three inclined rolls are not limited as long as the three inclined rolls are equally spaced around the pass line. For example, the first inclined roll may be disposed directly below the pass line (downward in the vertical direction).

Hereinafter, specific examples of the inclined rolling mill of the present embodiment will be described with reference to the drawings.

FIG. 1 is a plan view showing an inclined rolling mill of the present embodiment and the periphery thereof. FIG. 2 is a front view of an inclined roll provided in the inclined rolling mill shown in FIG. 1 and 2 illustrate a three-roll tilt mill. Here, FIG. 2 shows the arrangement of the three inclined rolls 2a, 2b and 2c around the pass line PL. In addition, FIG.1 and FIG.2 shows the piercing-rolling mill used at a piercing-rolling process as an example of an inclination rolling mill. In FIG. 1, the plug as the inner surface control tool and the core metal supporting the plug are not shown. In FIG. 2, a round billet B is shown for reference.

With reference to FIGS. 1 and 2, the inclined rolling mill 1 includes three inclined rolls 2a, 2b and 2c, and three driving devices 3a, 3b and 3c. Drive devices 3a, 3b and 3c are provided corresponding to inclined rolls 2a, 2b and 2c. That is, one drive device 3a is provided for one inclined roll 2a. One driving device 3b is provided for one inclined roll 2b. One driving device 3c is provided for one inclined roll 2c.

Referring to FIG. 2, three inclined rolls 2a, 2b and 2c are arranged at intervals of 120 ° around the pass line PL. When the inclined rolling mill 1 is viewed from the upstream of the pass line PL, the first inclined roll 2a of the three inclined rolls 2a, 2b and 2c is disposed directly above the pass line PL. The second inclined roll 2b is disposed at the lower right of the pass line PL. The third inclined roll 2c is disposed at the lower left of the pass line PL. Each of the three inclined rolls 2a, 2b and 2c is of a cone shape, and each is inclined with respect to the pass line PL at a predetermined inclination angle (Feed Angle) and a predetermined cross angle.

In addition, an inclination | tilt angle means the swing angle of the central axis of the inclination roll in the circumferential direction centering on a pass line. The crossing angle means the swing angle of the central axis of the inclined roll in the radial direction centering on the pass line.

Referring to FIG. 1, the three drive devices 3a, 3b and 3c respectively include drive shafts 4a, 4b and 4c, first universal joints 6a, 6b and 6c, and second universal joints 7a, 7b and 7c, And motors 5a, 5b and 5c. One end of the drive shaft 4a, 4b, 4c is connected to the central axis of the inclined rolls 2a, 2b, 2c via a first universal joint 6a, 6b, 6c. The other ends of the drive shafts 4a, 4b, 4c are connected to the main shafts of the motors 5a, 5b, 5c via the second universal joints 7a, 7b, 7c.

In the present embodiment, the first drive device 3a of the three drive devices 3a, 3b and 3c is connected to the first inclined roll 2a disposed immediately above the pass line PL. The second driving device 3b is connected to a second inclined roll 2b disposed at the lower right of the pass line PL. The third driving device 3c is connected to the third inclined roll 2c disposed at the lower left of the pass line PL.

At the front (incoming side) of the inclined rolls 2a, 2b and 2c, the following accessory devices are installed. A pusher (not shown) is placed on the pass line PL. A billet guide 11 is installed adjacent to the inclined rolls 2a, 2b and 2c. Further, the carry-in table 10 extends to the left side of the pass line PL as viewed from the upstream side of the pass line PL. In the carry-in table 10, the round billet is conveyed toward the pass line PL by, for example, a walking beam. A loading device (not shown) is installed at the end (right end) of the loading table 10.

At the rear (outside) of the inclined rolls 2a, 2b and 2c, the following accessory devices are installed. Pinch rollers (not shown) are provided adjacent to the inclined rolls 2a, 2b and 2c. A plurality of drag-out rollers 21 and a plurality of verstadia 22 are alternately installed along the pass line PL. Further, when viewed from the upstream side of the pass line PL, the carry-out table 20 extends to the right side of the pass line PL. In the carry-out table 20, for example, the raw pipe is transported in a direction away from the pass line PL by a walking beam. At the beginning (left end) of the carry-out table 20, a carry-out device (not shown) is installed.

The following can be said from the installation situation of the incidental device around the inclined rolling mill 1 and the layout of the entire equipment including the inclined rolling mill 1 and the incidental device. As seen from the upstream side of the pass line PL, there is a space on the right side of the pass line PL in front of the inclined rolls 2a, 2b and 2c (inside). As seen from the upstream side of the pass line PL, a space exists on the left side of the pass line PL behind (outgoing side) the inclined rolls 2a, 2b and 2c. Further, with regard to the space around the pass line PL, the space in front of the inclined rolls 2a, 2b and 2c (in the entry side) has a margin more than the space in the rear (outside) thereof.

So, in this embodiment, 1st and 2nd drive devices 3a and 3b are arrange | positioned ahead (ingress side) of the inclination rolls 2a and 2b. The drive device 3a is connected to the front end (the end on the entry side) of the central axis of the inclined roll 2a. Similarly, the drive device 3b is connected to the front end (the end on the entry side) of the central axis of the inclined roll 2b. A drive device is not connected to the rear end (the end on the outlet side) of the central axis of each of the inclined rolls 2a and 2b. On the other hand, the third drive device 3c is disposed at the rear (outside) of the inclined roll 2c. The driving device 3c is connected to the rear end (outside end) of the central axis of the inclined roll 2c. The drive device is not connected to the front end (the end on the entry side) of the central axis of the inclined roll 2c. That is, two drive devices 3a and 3b are disposed in front of the inclined rolls 2a and 2b having a space (inside), and one drive is provided behind (outside) the inclined roll 2c having a small space. The device 3c is arranged. In other words, the plurality of drive devices 3a, 3b and 3c are distributed and arranged in front (inside) and back (outside) of the inclined rolls 2a, 2b and 2c. Therefore, the work space for setup change of an incidental device can be secured. Moreover, the installation space of an incidental apparatus can be secured.

In addition, it goes without saying that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

The inclined rolling mill of the present invention can be effectively used for the production of seamless metal pipes.

DESCRIPTION OF SYMBOLS 1 Tilt rolling mill 2a, 2b and 2c Tilt roll 3a, 3b and 3c Drive device 4a, 4b and 4c Drive shaft 5a, 5b and 5c Electric motor 6a, 6b and 6c 1st universal joint 7a, 7b and 7c 2nd universal joint PL 2nd universal joint PL Pass Line 10 Loading Table 11 Billet Guide 20 Loading Table 21 Drag-out Roller 22 Barsteadia

Claims (3)

1. A plurality of inclined rolls arranged at equal intervals around the pass line,
   A plurality of drives each connected to the corresponding inclined roll;
   An inclined rolling mill, wherein the plurality of drive devices are distributed and disposed in front of and behind the inclined roll.
2. The inclined rolling mill according to claim 1, wherein
   The number of said inclined rolls is two and the number of said driving devices is two,
   An inclined rolling mill, wherein a drive of one of the two drives is arranged in front of the inclined roll and the remaining drives are arranged behind the inclined roll.
3. The inclined rolling mill according to claim 1, wherein
   The number of inclined rolls is three and the number of drives is three,
   An inclined rolling mill, wherein one or two of the three drives are arranged in front of the inclined roll, and the remaining drives are arranged behind the inclined roll.

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