JPH06328107A - Device for changing roll of piping mill - Google Patents

Abstract

PURPOSE:To execute work for changing rolls of a piping mill in a short time. CONSTITUTION:Inner housings 6 of the piping mill is made so as to be retractable in the forming line direction to outer housings 7. A The inner housings 6 which are arranged in the direction X of the forming line are made into an inner housing unit 12 by integrating them. A shifting truck 13 which is shiftable in the horizontal direction is arranged on the outlet side of the piping mill. A pipe transporting table 14 is placed on the shifting truck 13. An old roll pulling-out position 15 and new roll inserting position 16 are set on the shifting truck 13 and pushing /pulling devices are respectively provided. The inner housing unit 12 is pulled out of the outer housing 7 at the old roll pulling-out position 15 and the other inner housing unit 12' is inserted in the new roll inserting position 16 using the pushing/pulling devices.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill roll changing apparatus for producing seamless pipes.

[0002]

2. Description of the Related Art A seamless pipe is formed by sequentially rolling a pipe material having holes formed by an upstream piercer by means of a piping mill such as a mandrel mill, a sizer mill or a stretch reducing mill.

The piping mill has an upper housing part b and a lower housing part c on a base a, and an upper housing part b and a lower housing part b as shown in FIG.
Is provided with an outer housing d in which one end is openably and closably connected by a pin e and the other end is detachably connected by a bolt f, and inside the outer housing d, upper and lower holding members g and h are interposed. A ring-shaped inner housing i is arranged, molding rolls k are arranged in the inner housing i at intervals of 120 ° with respect to the circumferential direction of the pipe j to be molded, and a motor is provided on each molding roll k. A driven spindle (neither of which is shown) is detachably connected, and the pipe j is rolled so as to be reduced in diameter by applying a driving force of a motor to each forming roll k in synchronization through the spindle. A plurality of forming units 1 adapted to be formed by forming are formed in parallel in the forming line direction along the axis of the pipe j. m indicates an opening / closing cylinder of the outer housing d.

In the above piping mill, the pipe j
When the size of the molded product to be changed is changed, it is necessary to replace it with the molding roll k. In that case, the bolt f connecting the upper and lower housing parts b and c of the outer housing d is connected. , The upper housing part b is opened with respect to the lower housing part c with the pin e as a fulcrum, and then the inner housing i is hung by a special hanging tool to remove the old forming roll k. Of each inner housing i, and then the inner housing i into which the new forming roll k is incorporated is carried in by the procedure reverse to the above, and then the upper housing portion b
The lower housing part c is closed and integrated.

[0005]

However, in the case of the above-mentioned conventional piping mill, the outer housing d is divided into an upper housing part b and a lower housing part c so as to be opened and closed in order to replace the forming roll k. Therefore, the structure of the outer housing d is complicated, and the bolts f must be attached / detached and the opening / closing cylinder m must be operated for each outer housing d. Therefore, there is a problem that it takes a long time for the entire roll replacement work.

Incidentally, instead of the method of loading / unloading the inner housing i in the vertical direction, a method of loading / unloading the inner housing i in the lateral direction perpendicular to the molding line direction or in the molding line direction is also conceivable. In the case of a lateral loading / unloading method, the outer housing d is, for example, C
Since it is necessary to have an open shape such as a mold, the outer housing d itself becomes large in order to ensure strength, while in the case of a method of carrying in and out in the line direction, in general, the insertion of a piping mill Since the pipe conveying table from the previous process or the next process is located at the outlet side and it becomes an obstacle, it is difficult in terms of line configuration.

Further, these problems are the same as those of piping mills such as mandrel mills, stretch reducing mills and sizer mills.

[0008] Therefore, the present invention is intended to provide a roll exchanging device capable of exchanging rolls of a piping mill in a short time with a simple facility and improving productivity. is there.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention attaches and detaches an inner housing having a molding roll incorporated in a plurality of outer housings installed along a molding line in the molding line direction. The respective inner housings of the piping mill that can be accommodated are integrated in the molding line direction to form an inner housing unit, and the output side of the piping mill can be shifted in the lateral direction perpendicular to the molding line direction. A shift carriage is arranged, a pipe transport table for the next process is installed on the shift carriage, and an old roll pull-out position and a new roll insert position are set next to the pipe transport table, and the old roll pull-out position and At the new roll insertion position, the push-pull device that pushes and pulls the inner housing unit is placed. That.

Further, the pipe transport table may be installed on a mount which is separate from the shift carriage, and the mount may be moved up and down at the position of the molding line.

[0011]

[Operation] When the rolls are replaced, the shift carriage is shifted to evacuate the pipe transport table to a horizontal position off the forming line, and at the same time, the old roll drawing position is aligned with the forming line, and piping is performed by the pushing and pulling device. Pull the inner housing unit out of each outer housing of the mill onto the shift carriage. Next, the shift carriage is further shifted so that the new roll insertion position is aligned with the forming line, and the inner housing unit with the new roll, which has been set in advance at this position, is inserted into the outer housing by the push-pull device. insert. This allows
A new forming roll will be set.

When the pipe transport table is installed on a mount different from the shift carriage and is raised and lowered, the pipe transport table is lowered to retract the pipe transport table to a position below the molding line. You can

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention, showing an example of application to a mandrel mill 1 as a piping mill.

120 ° in the circumferential direction of the pipe 2 to be molded
Three forming rolls 3 arranged at intervals, an axle box 5 rotatably supporting a rotating shaft 4 of each forming roll 3,
A ring-shaped inner housing 6 that movably supports each axle box 5 in a radial direction, a fixed outer housing 7 that detachably accommodates the inner housing 6 in the molding line X direction, and a fixed outer housing 7. A pressing cylinder 8 for moving each of the three shaft boxes 5 in the radial direction and a tip 9a penetrating the housings 7, 6 are swingably connected to the rotary shaft 4 of the forming roll 3 and a base. A mandrel mill 1 in which five molding units 10 each having a spindle 9 whose end is connected to a rotation driving device (not shown) are arranged side by side in the X direction of the molding line so that the phases of the three molding rolls 3 are sequentially shifted. At
The lower left and right positions of each of the inner housings 6 are integrally connected by a rail 11 extending in the molding line X direction to form an inner housing unit 12, and the inner housing units 12 are inserted into and removed from the outer housings 7 in the molding line X direction. The shift carriage 13 is arranged at the exit side position of the mandrel mill 1 and is capable of shifting in the lateral direction (arrow Y direction) perpendicular to the forming line X direction, and the lateral direction on the shift carriage 13 is arranged. The pipe transport table 14 for the next process is installed at one end, and the old roll pull-out position 15 and the new roll insert position 16 are set on the shift carriage 13 side by side with the pipe transport table 14 to set each outer housing. Forming roll 3 older than 7 as inner housing unit 12 To drawer, so that is is inserted in each outer housing 7 in the inner housing unit 12 'the new roll insertion position 16 with a new forming roll 3. Reference numeral 25 denotes a guide roller attached to each outer housing 7 for guiding the rail 11 when the inner housing unit 12 is taken in and out of each outer housing 7.

The shift carriage 13 is, as shown in FIG.
By the expansion and contraction operation of the shift cylinder 17, it is possible to shift laterally along the guide rail 19 laid on the foundation 18. At the old roll pull-out position 15 and the new roll insert position 16 set on the shift carriage 13, one end of the rail 11 of the inner housing unit 12 is engaged to move the inner housing unit 12 to the molding line X.
A drawing car 20 as a pushing and pulling device for pushing and pulling in a direction is provided so as to be able to run along a running rail 21, and a guide roller 22 for guiding the rail 11 of the inner housing 6 is provided in the molding line X direction. Along the line, they are attached at the required intervals. Further, the pipe transfer table 14 has a large number of table rollers 24 each driven by a motor 23 in order to transfer the pipe 2 formed by the mandrel mill 1 to a downstream sizer mill in the forming line direction. It has a configuration installed in parallel with.

When the forming roll 3 of the mandrel mill 1 is replaced by changing the size of the pipe 2 to be formed, etc., as shown in (a), (b), (c), (d), (e), (f) of FIG. Follow the procedure.

That is, on the mandrel mill 1 side, in each forming unit 10, in advance, the spindle 9 is separated from the rotary shaft 4 of the forming roll 3 in the inner housing 6, and the pressing cylinder 8 is attached to the inner housing 6.
It is in a state of being retracted from the inside to the outer housing 7 side. On the other hand, on the shift carriage 13 side, as shown in FIG.
In the state of being aligned with the forming line X of the mandrel mill 1, first, the inner housing unit 12 'equipped with the new forming roll 3 is set at the new roll insertion position 16 on the shift carriage 13. At this time, the drawing car 20 is placed in the standby position at the downstream end in the molding line X direction, and the inner housing unit 12 'is placed on the guide roller 22 as shown in FIG.

Next, as shown in FIG. 5B, the shift carriage 13 is laterally shifted by the operation of the shift cylinder 17, so that the old roll drawing position 15 is aligned with the forming line X. As a result, the pipe transport table 14 is retracted to a lateral position deviating from the position on the molding line X.
Next, the drawing car 20 at the old roll drawing position 15
To the outlet of the mandrel mill 1 to move the rail 11 of the inner housing unit 12 of the mandrel mill 1.
After engaging the drawing car 20 at the end portion, the inner housing unit 12 is pulled out from each outer housing 7 onto the shift carriage 13 by retracting the drawing car 20 as shown in FIG. 5C. To do. In this case, the inner housing unit 12
Pull out onto the shift carriage 13, the old roll pull-out position 1
Since the rail 11 is guided by the guide roller 22 located at 5, the inner housing unit 12 can be pulled out smoothly.

Thereafter, as shown in FIG. 5D, the shift carriage 13 is further laterally shifted to align the new roll insertion position 16 with the forming line X, and then shown in FIG. 5E. The drawing car 2 at the new roll insertion position 16
The inner housing unit 12 ′ is inserted into each outer housing 7 of the mandrel mill 1 by moving 0 forward. As a result, the new forming roll 3 is incorporated in the mandrel mill 1.

When a new forming roll 3 is incorporated in the mandrel mill 1, the shift carriage 13 is returned to its original position and the pipe conveying table 14 is brought into alignment with the forming line X, as shown in FIG. On the other hand, mandrel mill 1
On the side, the spindle 9 is connected to the rotary shaft 4 of each forming roll 3, and the reduction cylinder 8 is connected to the shaft box 5 of the forming roll 3.
Make sure that the tip of is touched.

In the above, the pipe transport table 14
Is normally installed as a fixed position on the exit side of the mandrel mill 1, but in the present invention, the pipe transport table 14 is placed on the shift carriage 13 so that it can be moved. 6
Can be pulled out in the direction of the molding line X, which is the axial direction of the pipe 2. Therefore, it is not necessary to use a special structure such as an opening / closing structure or an open type for the outer housing 7, and a simple ring shape can be adopted. Further, since the inner housing 6 is integrated as the inner housing units 12 and 12 'by the rails 11, the forming rolls 3 can be collectively put in and taken out by a simple operation of the shift carriage 13 and the drawing car 20. Exchange work can be performed in a short time.

Next, FIG. 6 shows another embodiment of the present invention, in which the pipe transfer table 14 in the above embodiment is
A frame 2 separate from the shift carriage 13 by dividing the shift carriage 13 into a plurality of parts in the X direction of the molding line at the guide rails
8 digging a pit 26 in the foundation 18 so as to be located directly below the molding line X, and supporting each of the above-mentioned pedestals 28 on the upper end of an elevating cylinder 27 installed as an elevating device in the pit 26. The pipe transport table 14 is lowered into the pit 26 and retracted by operating the elevating cylinder 27.

In the case of the embodiment shown in FIG. 6, since the pipe transport table 14 can be moved up and down at the position of the forming line X, it does not interfere with the movement of the shift carriage 13 as shown by the chain double-dashed line when the rolls are replaced. Like this, the pipe transport table 14 can be retracted into the pit 26,
As a result, similar to the above-described embodiment, the rolls can be exchanged using the drawing car 20 at the old roll pull-out position 15 and the new roll insertion position 16 of the shift carriage 13.

In the above embodiment, the present invention shows an example of application to a 3-roll type mandrel mill as a piping mill, but it can also be applied to a 2-roll type mandrel mill, sizer mill or stretch reducing mill. Further, in the embodiment, the inner housing units 1 are integrally connected by the rails 11 to form the inner housing unit 1.
2 is shown, but a dolly may be used instead of the rail 11, and in the embodiment, a drawing car 20 is used as a push / pull device for pushing and pulling the inner housing unit. Although shown, it is needless to say that a cylinder or another device may be used, and various changes may be made without departing from the scope of the present invention.

[0026]

As described above, according to the roll exchanging device for the piping mill of the present invention, the new and old forming rolls are formed as the inner housing unit on the shift carriage disposed at the exit side of the piping mill. Since the rollers can be collectively taken in and out in the line direction, it has an excellent effect that the rolls can be exchanged in a short time without using complicated equipment.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of a roll exchanging device for a piping mill according to the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is an enlarged arrow view of III-III in FIG.

FIG. 4 is an enlarged view of IV-IV in FIG.

FIG. 5 shows a roll exchange procedure by the roll exchange apparatus of the present invention, and (a) to (f) are schematic diagrams showing the procedure.

FIG. 6 is a schematic diagram of another embodiment of the present invention.

FIG. 7 is a schematic view showing an example of a piping mill.

[Explanation of symbols]

 1 Mandrel Mill (Piping Mill) 3 Forming Roll 6 Inner Housing 7 Outer Housing 12, 12 'Inner Housing Unit 13 Shift Carriage 14 Pipe Conveying Table 15 Old Roll Drawing-out Position 16 New Roll Inserting Position 20 Drawing Car (pushing / pulling device) 28 Stand X molding line

Claims (2)

[Claims] 1. An inner housing incorporating a molding roll is housed in a plurality of outer housings installed along a molding line so as to be detachably accommodated in the molding line direction. A shift carriage that is integrated in the line direction to form an inner housing unit and that can be shifted in the lateral direction at right angles to the molding line direction is arranged on the exit side of the piping mill. A push-pull device for installing a pipe transport table, setting an old roll pull-out position and a new roll insert position next to the pipe transport table, and pushing and pulling the inner housing unit at the old roll pull-out position and the new roll insert position. And a roll exchanging device for a piping mill, characterized in that . 2. A roll exchanging device for a piping mill according to claim 1, wherein the pipe conveying table is installed on a pedestal separate from the shift carriage, and the pedestal can be moved up and down at the position of the molding line.