JPH02121706A - Method and device for piercing and rolling seamless metal tube - Google Patents

Abstract

PURPOSE:To manufacture high quality seamless metal tubes having no shoe mark flaw by changing a working position in the direction orthogonal to a rolling direction of disk shoes per rolling and mechanically removing adhered metal on disk shoe surfaces. CONSTITUTION:As for a Mannesman piercing machine 10, a working position of disk shoes 12 is surely and automatically adjustable every rolling time by mounting a rolling timing detector 15, a shoe position adjuster 16, an adhered metal remover 17, a removing position adjuster 18, and a controller 19. Thus, deposition of sized metal in the same region on the surface of the shoes 12 is prevented, a working position of the remover 17 is surely and automatically adjusted along the surface of the shoes 12 to easily remove simply peelable early seized metal M deposited on some regions on the surface of the shoes 12 by the remover 17. As the result, generation of shoe mark flaws is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for piercing and rolling seamless metal pipes.

[Prior Art] Generally, in the piercing-rolling process of seamless metal pipes, two rolling rolls 1 having an entrance side angle and an exit side angle are arranged inclined at a constant advance angle, as shown in Fig. 8. In addition, a piercer comprising a disc shoe 2 disposed between both rolling rolls 1,
An inclined rolling mill such as Elongator is used. In FIG. 8, 3 is a plug and 4 is a material.

The disc shoe 2 prevents the material 4 from escaping to the side of the rolling area formed by both rolling rolls 1 during rolling.

By the way, since the disc shoe 2 receives both the friction caused by the rotation of the material 4 around its axis and the friction caused when the material 4 is stretched in the axial direction, the friction between the surface of the disc shoe 2 and the outer surface of the material 4 is reduced. The situation becomes very complicated and severe, and the surface of the disc shoe 2 is likely to have baked-in metal deposits. The seizing that occurs on the surface of the disc shoe 2 in this way causes shoe marks on the outer surface of the product tube, which deteriorates its quality.

The seizure phenomenon on the surface of the disc shoe 2 is particularly noticeable when the material 4 is made of high-alloy steel, because scale generation on the surface of the material is small.

Conventionally, in order to prevent the occurrence of seizure phenomenon on the surface of the disc shoe 2, a mixed liquid paint containing an anti-seizure agent consisting of metal oxide particles and a binder, as described in Japanese Patent Application Laid-Open No. 60-21111, has been proposed. A method has been proposed in which the material is continuously sprayed onto the surface of the disc shoe and rolled while being applied.

[Problems to be Solved by the Invention] However, the conventional anti-seizure method described above has the following problems.

(1) It is necessary to provide a paint injection supply device, which requires large-sized equipment.

(2) It is difficult to adjust the particle size of the anti-seize agent.

(3) Binder tends to harden in the piping and nozzles of the paint injection supply device installed around the hot rolling equipment, which may cause the paint to stick, resulting in a heavy maintenance load.

An object of the present invention is to make it possible to manufacture high-quality seamless metal pipes without shoe marks using a compact apparatus configuration with good operability and maintainability.

[Means for Solving the Problems] The present invention as set forth in claim 1 provides a seamless rolling mill comprising a set of rolling rolls arranged inclined at a constant advance angle and a disc shoe arranged between both rolling rolls. In the method of piercing and rolling metal tubes, the working position of the disc shoe in the direction perpendicular to the rolling direction is changed every rolling, and the rolling is performed while mechanically removing metal adhering to the surface of the disc shoe. be.

The present invention as set forth in claim 2 provides a seamless metal pipe piercing and rolling apparatus in which a set of rolling rolls are arranged at an angle with a constant advance angle, and a disc shoe is arranged between both rolling rolls. A rolling timing detector that can detect the end timing of each rolling, a shoe position adjustment device that adjusts the working position of the disc shoe in a direction perpendicular to the rolling direction, and an adhesion device that mechanically removes deposited metal on the surface of the disc shoe. A metal removal tool, a removal tool position adjustment device that adjusts the working position of the adhered metal removal tool along the disk shoe surface, and a shoe position adjustment device that is driven for each rolling based on the detection results of the rolling timing detector. and a control device that adjusts the working position of the disk shoe and drives a removing tool position adjusting device to adjust the working position of the adhered metal removing tool.

[Function] The present invention according to claim 1.2 was made based on the following findings (1) to (2).

■The baked-on metal deposited on the surface of the disc shoe is difficult to remove with a removal tool.

The initial baked-on metal produced on the surface of the disc shoe by rolling 01 times can be relatively easily peeled off with a remover.

(2) By changing the working position of the disc shoe in the direction perpendicular to the rolling direction for each rolling, the contact area of the shoe surface with the rolled material changes, making it possible to avoid the accumulation of baked metal on the shoe surface.

Therefore, according to the present invention as set forth in claim 1, the working position of the disc shoe in the direction orthogonal to the rolling direction is changed at a pitch of, for example, 1 mm for each rolling, and the baked metal within the same region of the shoe surface is changed. At the same time, the initially baked metal that is likely to be peeled off from each region of the shoe surface can be easily removed using a remover, and as a result, shoe marks can be prevented.

Further, according to the present invention as set forth in claim 2, by having the rolling timing detector, the shoe position adjustment device, the adhered metal removal tool, the removal tool position adjustment device, and the control device, the disc The working position of the shoe is reliably automatically adjusted to prevent the accumulation of baked-on metal within the same area of the shoe surface, and the working position of the removal tool is also reliably and automatically adjusted along the surface of the disc shoe to prevent the accumulation of baked-on metal within the same area of the shoe surface. Easily remove early baked metal that is likely to peel off with a remover,
As a result, shoe marks can be reliably and easily prevented.

That is, according to the present invention as set forth in claim 1.2, a high quality seamless metal pipe without shoe marks can be manufactured using a compact apparatus configuration with good operability and maintainability.

[Example 1] Fig. 1 is a schematic diagram showing an example of a piercing rolling machine of the present invention, Fig. 2 is a schematic diagram showing an example of a shoe position adjusting device, and Fig. 3 is a schematic diagram showing an example of a remover position adjusting device. Figure 4 is a schematic diagram showing the direction in which the position of the disc shoe is changed; Figure 5 is a schematic diagram showing the amount of position change of the disc shoe; FIG. 7 is a chart showing specific implementation results of the present invention.

As shown in FIG. 1, the Mannesmann perforator 10 has a set of rolling rolls 11 arranged at an angle with a constant advance angle, and a disk shoe 12 arranged between both rolling rolls 11. 13 is a plaque, and 14 is a material. The disc shoe 12 prevents the material 14 from escaping to the side of the rolling area formed by both rolling rolls 11 during rolling.

As shown in FIG. 1, the punching machine 10 includes a rolling timing detector 15, a shoe position adjustment device 16, and an attached metal removal tool 17.
, a remover position adjustment device 18, and a control device 19.

As shown in FIG. 1, the rolling timing detector 15 can detect changes in the current of the rolling roll drive upper roller 20, and can also detect the rolling end timing for each rolling.

As shown in FIGS. 1 and 2, the shoe position adjustment device 16 adjusts the working position of the disc shoe 12 rotated by the shoe drive motor 21 in the direction perpendicular to the rolling direction, so that the shoe position adjustment device 16 adjusts the working position of the disc shoe 12 in the direction perpendicular to the rolling direction as shown in FIG. Adjust each time. By adjusting the position of the disc shoe 12 by this shoe position adjustment device 16,
The contact area A (see FIG. 5) between the disc shoe 12 and the material 14 for each rolling is moved laterally (moved in the direction perpendicular to the rolling direction) by the position change amount δ for each rolling. . The contact area between the disc shoe 12 and the material 14 tends to be located on the side where the rolling roll 11 feeds the material 14, that is, shifted from the center of the main body of the disc shoe 12 to the material entry side.

However, in the case of the conventional shoe position fixing method, the baked metal on the shoe surface of the disc shoe 12 is deposited in the same area sequentially as shown in FIG. 6(A) as the number of rolling operations is accumulated. The shoe position movement method of the present invention prevents the accumulation within the same position, and only produces the initial baked metal M in each region as shown in FIG. 6CB). 1.2 in Figure 6 (A) and (B),...
・represents the first rolling, the second rolling, etc., respectively, and the allowable cumulative value δma of the above-mentioned shoe position change amount δ
The setting of x will be described later.

Specifically, as shown in FIG. 2, the shoe position adjustment device 16 is configured to
A stopper 24 that positions the arbor cover 23 provided around the two sides in the axial direction, a stopper position adjustment motor 25 that changes the set position of the stopper 24, and a positioning device that presses the arbor cover 23 against the stopper 24 and positions it. It is configured to have a cylinder 26. Reference numeral 27 denotes an arbor support base that supports the arbor cover 23 so as to be movable in the axial direction. That is, the shoe position adjustment device 1
6, the stopper 2 is moved by the stopper position adjustment motor 25.
4, move the ARHA cover 23 in the axial direction using the positioning cylinder 26, and position it by pressing it against the stopper 24 mentioned above.As a result, the working position of the disc shoe 12 is changed as described above. Adjust.

As shown in FIG. 1, the adhered metal remover 17 is composed of a scraper that is pressed against the surface of the disc shoe 12, and mechanically removes the initially baked metal that adheres to each region of the surface of the disc shoe 12 as described above. Remove.

As shown in FIG. 1, the removing tool adjusting device 18 adjusts one working position of the adhered metal removing tool 17 along the surface of the disc shoe 12 for each rolling. That is, the removal tool position adjustment device 1
8 moves the removing tool 17 every time the rolling is performed, and always sets the removing tool 17 correspondingly to each removing work position for the above-mentioned initial baked-in metal iM generated on each region of the shoe surface. In this way, new initially baked metal M is constantly removed.

Specifically, as shown in FIG. 3, the remover position adjusting device 18 is supported by an arm support 32 provided on the housing 31 of the disk shoe 12 and moves in a direction perpendicular to the rolling direction of the disk shoe 12. a movable arm 33 that can be moved, a shoe holding section 34 that holds the remover 17 at the tip of the movable arm 33, a disc spring 35 built in the shoe holding section 34 that presses the remover 17 against the shoe surface, and a movable arm 33. The remover position adjusting motor 36 drives the disc shoe 12 in one direction. That is, the removal tool position adjustment device 18 moves the movable arm 33 by the motor 36, and as a result, adjusts the working position of the removal tool 17 as described above.

As shown in FIG. 1, the control device 19 drives the shoe position adjustment device 16 to adjust the working position of the disc shoe 12 for each rolling roll based on the detection result of the rolling timing detector 15. The removing tool position adjusting device 18 is driven to adjust the working position of the adhered metal removing tool 17.

Next, the operation of the above embodiment will be explained.

According to the Mannesmann drilling machine 10, by having the rolling timing detector 15, the shoe position adjustment device 16, the adhered metal removal tool 17, the removal tool position adjustment device 18, and the control device 19, the disc The working position of the shoe 12 is reliably automatically adjusted to prevent the accumulation of baked metal within the same area of the shoe surface, and the working position of the removing tool 17 is also reliably and automatically adjusted along the surface of the disc shoe 12 to prevent the build-up of baked metal in the same area of the shoe surface. The remover 17 can easily remove the initially baked metal M that is easily peeled off in each region of the surface, and as a result, shoe marks can be prevented.

Note that the allowable cumulative value δmax of the shoe position change amount δ is as follows:
For example, in FIG. 4, the gap g between the edge of the disk shoe 12 on the material entry side through which the rolling roll 11 feeds the material 14 and the outer surface of the rolling roll 11 is excessively expanded, causing the material 14 to be fed into the material 14.
must be limited so that it does not escape out of the rolling area through the gap g. Specifically, this δmax is
It is determined by δrnax = f (roll diameter, disc shoe flange diameter, rolling roll spacing, disc shoe spacing, rolling roll inclination angle).

FIG. 7 shows a concrete implementation result of the present invention.

In the disk position change pattern (■), the disk shoe 12 is changed from the original position in one direction at a pitch of 1 mm for each rolled wood, and after moving 5 mm, returns to the original position and repeats the above-mentioned one-way movement from the original position. be. In the disk position change pattern (■), the disk shoe 12 is repositioned from the original position in one direction at a pitch of 1 mm for each roll, and after moving 5 mm, the position is changed in the opposite direction from the end of the 5 rAm movement at a pitch of 1 mm for each roll. It is something to do. ■,■ above
5 mm corresponds to the above-mentioned δmax.

According to FIG. 7, according to Examples 1 to 4 of the present invention, there is no seizure on the shoe surface after rolling, and they can be used continuously, whereas in Comparative Examples 1 and 2, after rolling Seizing occurred on the surface of the shoe, and it was observed that the shoe required maintenance.

[Effects of the Invention] As described above, according to the present invention, a high-quality seamless metal pipe without shoe marks can be manufactured using a compact apparatus configuration with good operability and maintainability.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a piercing rolling device of the present invention, FIG. 2 is a schematic diagram showing an example of a shoe position adjustment device, FIG. 3 is a schematic diagram showing an example of a remover position adjustment device, and FIG. The figure is a schematic diagram showing the direction of position change of the disc shoe, Figure 5 is a schematic diagram showing the amount of position change of the disc shoe, Figure 6 is a schematic diagram showing the state of baked metal adhesion on the shoe surface, and Figure 7 is a diagram showing the present invention. FIG. 8 is a schematic diagram showing a conventional example. DESCRIPTION OF SYMBOLS 10... Mannesmann punching machine, 11... Rolling roll, 12... Disk shoe 15... Rolling timing detector, 16... Shoe position adjustment device, 17... Adhesive metal removal tool, 18. ...Removal tool position adjustment device, 19...Control device. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 3 Figure 4 Figure 5 Figure 7 Figure 6 Deposition prevention status diagram

Claims (2)

[Claims] (1) In a method of piercing and rolling a seamless metal pipe in which a pair of rolling rolls are arranged at an angle with a constant advance angle and a disc shoe is arranged between both rolling rolls, the hole is perpendicular to the rolling direction of the disc shoe. A method for piercing and rolling a seamless metal pipe, characterized in that the working position in the direction is changed every time the rolling is performed, and rolling is carried out while mechanically removing metal deposited on the surface of the disc shoe. (2) In a seamless metal pipe piercing and rolling machine in which a set of rolling rolls are arranged at a constant advance angle and a disc shoe is arranged between both rolling rolls, the rolling end timing for each rolling is performed. A rolling timing detector that can detect the rolling timing, a shoe position adjustment device that adjusts the working position of the disk shoe in the direction perpendicular to the rolling direction, an adhered metal removal tool that mechanically removes adhered metal on the surface of the disk shoe, and an adhered metal Based on the detection results of the removal tool position adjustment device that adjusts the working position of the removal tool along the disk shoe surface and the rolling timing detector, the shoe position adjustment device is driven for each rolling to adjust the above working position of the disk shoe. and a control device for adjusting the working position of the adhered metal removing tool by driving a removing tool position adjusting device.