WO1999019093A1

WO1999019093A1 - Piercing mill

Info

Publication number: WO1999019093A1
Application number: PCT/JP1998/004630
Authority: WO
Inventors: Hisao Goto; Yoichi Yokoi
Original assignee: Sumitomo Metal Industries, Ltd.
Priority date: 1997-10-14
Filing date: 1998-10-14
Publication date: 1999-04-22
Also published as: JP3239896B2; EP1022068A4; EP1022068A1

Abstract

A piercing mill capable of producing thin-walled pipes and improving a work efficiency of a disc roll position adjustment while securing sufficiently support rigidity of a disc roll, comprising a mill housing, a pair of disc frames (6) capable of turning toward a pass line and being opened, and a pair of upper and lower sliding frames (8) capable of sliding on the inner surface of the disc frames, wherein a skew angle of the disc roll (4) is set when the sliding frames (8) are slid in mutually opposite directions. This piercing mill can improve a work efficiency of the position adjustment by changing the disc roll and is effective in expanding the range of thin-walled tubes to be produced because setting of a skew angle of the disc roll can be made easily and reliably.

Description

.

PCT / JP98 / 04630

A. CLASSIFICATION OF SUBJECT MATTER

Int. CI ⁶ B21B19 / 04

According to International Patent Classification (IPQ or to both national classification and IPC

B. FIELDS SEARCHED

Minimum documentation searched (classification system followed by classification symbols)

Int.CI ⁶ B21B19 / 00-19/04, 31/08-31/14

Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Jitsuyo Shinan Koho 1926-1996 Toroku Jitsuyo Shinan Koho 1994-1998

Kokai Jitsuyo Shinan Koho 1971-1998 Jitsuyo Shinan Toroku Koho 1996-1998

Electronic data base consulted during the international search (name of data base and, where practicable, search terms used)

C. DOCUMENTS CONSIDERED TO BE RELEVANT

Category * Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.

A JP, 5-200412, A (Sumitomo Heavy Industries, Ltd.), L-5

10 August, 1993 (10. 08. 93),

Page 3, column 3, line 34 to column 4, line 10;

Fig · 1 (Family: none)

A CD-ROM of the specification and drawings annexed to .-5

the request of Japanese Utility Model Application

No. 41270/1993 (Laid-open No. 9501/1995)

(Sumitomo Heavy Industries, Ltd.),

10 February, 1995 (10.02.95),

Page 7, line 23 to page 9, line 8; Fig. 3

(Family: none)

A JP, 59-1008, A (IshiJ awa jima-Harinia Heavy- 1-5

Industries Co., Ltd.),

6 January, 1984 (06.01.84),

Page 2, lower right column, line 7 to page 3,

upper right column, line 15; Figs. 2, 4

(Family: none)

[X j Further documents are listed in the continuation of Box C. ι] See patent family annex.

* Special categories of cited documents: "T" later document published after the international filing date or priority "A" document defining the general state of the art which is not date and not in conflict with the application but cited to understand considered to be of particular relevance the principle or theory underlying the invention

"earlier document but published on or after the international filing date" X "document of particular relevance; the claimed invention cannot be" L "document which may throw doubts on priority claim (s) or which is considered novel or cannot be considered to involve an inventive step cited to establish the publication date of another citation or other when the document is taken alone

special reason (as specified) "Y" document of particular relevance; the claimed invention cannot be "O" document referring to an oral disclosure, use, exhibition or other considered to involve an inventive step when the document is means combined with one or more other such documents, such combination

"P" document published prior to the international filing date but later than being obvious to a person skilled in the art

the priority date claimed "&" document member of the same patent family

Date of the actual completion of the international search Date of mailing of the international search report

25 December, 1998 (25.1298) 12 January, 1999 (12.01.99)

Name and mailing address of the ISA / Authorized officer

Japanese Patent Office

Facsimile No. Telephone No.

Form PCT / ISA / 210 (second sheet) (July 1992) .

PCT / JP98 / 04630

C (Continuation). DOCUMENTS CONSIDERED TO BE RELEVANT

A JP, 63-90306, A (Kawasaki Steel Corp. L-5

21 April, 1988 (21.04.88),

Figs. 1, 3, 4 (Family: none)

Form PCT / ISA / 210 (continuation of second sheet) (July 1992) Mechanized piercing and rolling mill Technical field

The present invention relates to a piercing and rolling mill for seamless steel pipes, and more particularly, to a piercing and rolling mill that enables thin-wall piercing without deteriorating the workability of adjusting a position of a disc roll. Background art

The so-called Mannesmann pipe manufacturing method is widely used as a method for hot-working seamless steel pipes. In this pipe making method, a solid round billet heated to a high temperature is used as a material to be rolled, and the round billet is fed to a piercing mill (a so-called piercer) to pierce the center of the shaft. To obtain a hollow shell. Then, the obtained hollow shell is expanded as it is or through an elonge mill having the same configuration as that of the above-described piercing mill, if necessary, to reduce the diameter and the thickness, and then the elongation rolling machine followed by a plug mill, a mandrel mill, etc. It is sent to K and rolled. After that, it passes through a stretch reducer, a reeler, a sizer, and the like, and then goes through a polishing process for shape correction and sizing to produce a seamless steel pipe as a product.

The piercing rolling mill includes a pair of piercing rolls arranged above and below the pass line of the material to be rolled, and a pair of disc rolls arranged in a direction perpendicular to the arrangement direction of the piercing rolls. The material to be rolled is supported and swiveled by a scroll to perform piercing rolling ₍ and at least during rolling operation, these rolls and disc rolls are held together in the mill housing). The mutual positional relationship is firmly fixed.

-1- As described above, in a piercing mill, the rolled surface deteriorates as the rolling time elapses because the piercing roll is pressed against the material to be rolled maintained at a high temperature. . Also, the disc rolls are worn by contact with the material to be rolled. Therefore, drill rolls and day scrolls must be replaced periodically. In particular, when exchanging the disc orifice, it is necessary to open the mill housing and sequentially lift the disc rolls using an overhead crane or the like to perform the roll exchange. In such an exchange operation using an overhead crane, a large amount of time is required to exchange a pair of disc rolls, so that a reduction in the operation rate of the piercing mill cannot be avoided.

Various remedies have been proposed for the above-mentioned problem of disc roll exchange in a piercing mill. For example, Japanese Patent Publication No. 63-64248 discloses a piercing mill in which rolls can be exchanged without using an overhead crane. The configuration of the machine is disclosed. However, in the proposed configuration, the disc roll is supported by the cantilever from the drive shaft side, and there is a problem that sufficient rigidity cannot be obtained for the positioning of the portal during operation. In other words, when the support rigidity of the disk mouth is low, the day scroll may oscillate at the material contact portion during piercing and rolling, which causes a problem that a flaw is generated on the surface of the material to be rolled.

By the way, when a thin hollow shell is to be manufactured by piercing and rolling, the outer peripheral length of the material to be rolled increases due to an increase in the thickness reduction and guide flaws are easily generated.

FIG. 1 is a diagram for explaining a state of a shape abnormality that occurs when a thin hollow shell is rolled by a piercing mill using a disk roll. In FIG. 1, the material to be rolled 1 is advancing while rotating in a direction perpendicular to the plane of the drawing by the piercing and rolling of the piercing roll 2, the plug 3, and the disc roll 4. At this time, if the rolling reduction increases and the bulge of the outer peripheral length of the material to be rolled 1 increases, A part of the material to be rolled enters the gap between the disk edge on the rotation entry side of the material and the roll for punching, and guide flaws are generated on the outer surface of the material to be rolled. Further, when the above-mentioned penetration amount is excessive, the material to be rolled does not rotate, and a situation occurs in which rolling is stopped. In order to prevent such a situation, as shown in FIG. 2, the edge of the disc roll 4 is parallel to the exit side of the perforating roll 2 and the gap between the rolls is reduced so that the gap is reduced. The skew (crossover) is made at a predetermined skew angle with respect to the pass line X—X serving as the rolling movement axis, and the disc roll 4 is arranged at an angle. In this case, if the support rigidity of the disc roll is insufficient, the disc roll deflects at the edge portion, and there is a problem that the generation of guide flaws is promoted. Disclosure of the invention

The conventionally proposed piercing and rolling mill has a problem that the surface of the material to be rolled is apt to have flaws because the support rigidity of the disc roll is low. Furthermore, even when the skew corner of the scroll is set, run-out at the edge of the disc roll cannot be prevented, and there is a problem that the generation of guide flaws is promoted. On the other hand, if the support rigidity of the disc roll is to be sufficiently ensured, the structure of the apparatus becomes complicated, and accordingly, the workability of setting the skew angle of the disc roll and adjusting the position is further reduced. This reduction in workability due to disk roll replacement not only deteriorates the operation rate of the piercing mill, but also in particular, as in recent years, the Mannesmann pipe-making facility for the purpose of producing highly efficient seamless steel pipes. If the continuity of steel pipes is implemented, the overall efficiency of seamless steel pipe production will deteriorate.

The present invention solves the problems of conventional piercing mills, secures the support rigidity of the disc rolls, expands the range of thin-walled pipes, improves the performance of the piercing mills, and increases the skew of the disc rolls. Improve workability, such as setting square corners, to produce small-quantity multi-product seamless steel pipes from small to large diameter pipes. It is an object of the present invention to provide a piercing and rolling mill corresponding to.

The gist of the present invention resides in a piercing and rolling mill used for producing a seamless steel pipe of the following (1) to (4). The part numbers to be added are described in Figs. 4 and 5 described later. (1) A pair of piercing rolls 2 arranged opposite to each other around the pass line, and a pair of piercing rolls 2 which are opposite to each other so as to reduce the distance between the rotation entry side surface of the material to be rolled and the exit surface of the piercing rolls. In a piercing and rolling mill of a seamless steel pipe manufacturing apparatus in which a pair of skewed and opposedly disposed disk rolls 4 are housed in an integrated mill housing, the pier is mounted on a side surface of the mill housing 5 and is laterally mounted. A pair of upper and lower sliding frames 8 which support a disk roll 4 integrated with the shaft and are slidable on the inner surface of the disk frame. A perforation rolling machine characterized in that the sliding frame is slid in opposite directions so that the skew angle of the scroll can be set.

(2) In the above (1), the hitchock frame 11 provided in the I: part shaft 4s of the disc roll 4 and rotatably supporting the chick 13 and provided in the lower shaft. In addition, the lower chick frame 12, which supports and incorporates the chick 13 in such a manner that it can be π-forced, and the upper sliding frame 8a, which is attached to the upper sliding frame 8a of the pair of sliding frames and ii, is opened. And a lower opening adjustment frame 10b attached to the lower sliding frame 8b and adjusting the opening of the lower choke frame 12. By fitting the chick frame and the pair of upper and lower adjustment degree frames respectively, the disk roll 4 integrated with the shaft can be supported at both ends. Piercing mill, wherein the door. At this time, it is desirable that the method of rotatably supporting the chick be pin support.

(3) In the above (1) and (2), the upper sliding frame 8a is connected to the upper sliding frame 8a. The height of the disk roll is adjusted by a balancing device placed, and the opening of the scroll is adjusted by a rolling mechanism installed on the pair of sliding frames 8a and 8b. Piercing and rolling mill.

(4) In any one of the above (1) to (3), a rotating shaft 7 for supporting the disk frame 6, a clamp means 18 provided on the disk frame 6, and a clamp device 19 provided on the mill housing When the disc frame is closed and fixed to the mill housing, fixing in the height direction is performed by the rotating shaft and the clamping means, and fixing in the turning direction can be performed by the clamping device. A piercing mill. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a view for explaining the state of shape abnormality that occurs when a thin hollow shell is rolled by a piercing mill using a disc roll.Fig. 2 shows the skew angle of the disc roll in rolling. It is a figure showing a setting situation.

FIG. 3 is a diagram showing a configuration example of a mill housing of a piercing mill according to the present invention.

FIG. 4 is a perspective view for explaining an overall configuration in which the disc frame is supported when the disc frame is turned.

FIG. 5 is a perspective view illustrating a main part configuration in which a disk roll integral with the shaft is supported by a disk frame.

FIG. 6 is a diagram schematically illustrating an operation of setting a skew angle of a disc roll.

FIG. 7 is a longitudinal sectional view showing a configuration example of a pair of disk rolls arranged to face the mill housing.

FIG. 8 is a diagram showing a configuration example of a clamp device arranged at a closed position of a disk frame for fixing to a mill housing. One 5- BEST MODE FOR CARRYING OUT THE INVENTION

The piercing and rolling mill according to the present invention is provided with a pair of disk frames mounted on the side surface of the mill housing and capable of turning to the side of the path line and opening, and the disk surface integral with the shaft is provided on the inner surface of the disk frame. A pair of upper and lower sliding frames that support and slide the doors are provided.By sliding these sliding frames in opposite directions, the skew angle of the disk opening is set. Its main feature is its structure.

By employing the above configuration, the skew angle of the disc roll can be easily and reliably set, and the workability of adjusting the height and opening of the disc roll can be improved. That is, it is possible to easily replace the disc staple without using an overhead crane.

In addition, it is provided at both ends of the shaft of the disc roll and rotatably supports the built-in chuck, and is mounted on the lower chuck frame and a pair of upper and lower sliding frames to adjust the position of the chuck frame. A lower opening adjustment frame is provided, and the pair of chuck frames and the pair of opening adjustment frames are fitted to each other so that the shaft and the disk roll integral with the shaft can be supported at both ends. I have.

For this reason, in the piercing mill according to the present invention, the gap between the exit roll and the disc roll can be set to the minimum necessary by the function of setting the skew angle, so that the range of the thin-walled pipe can be expanded. . Furthermore, since sufficient supporting rigidity can be ensured, it is possible to prevent the surface of the material to be rolled from being flawed due to the disk roll swinging at the material contact portion during piercing and rolling. As a method of rotatably supporting the chick, for example, there is a pin support.

Further, the piercing and rolling mill according to the present invention comprises a pair of upper and lower sliding frames.

-6- The lowering mechanism installed on the arm and the balance device installed on the upper sliding frame or the upper sliding frame and the upper opening adjustment frame adjust the disc roll opening by the lowering mechanism. In addition, the height of the disk roll can be adjusted by a balance device. Therefore, the workability and setting accuracy of the disc roll position adjustment can be maintained, the range of the thin-walled pipe formed by the piercing mill can be expanded, and the workability of replacing the disk opening can be improved.

In addition, in order to ensure the setting accuracy of the disk roll, the disk frame is provided with a rotating shaft for supporting the disk frame, a clamping means provided on the disk frame, and a clamping device provided on the mill housing. When closed and fixed to the mill housing, fixing in the height direction is performed by the rotating shaft and clamping means, and fixing in the turning direction can be performed by the clamping device.

Therefore, according to the piercing and rolling mill of the present invention, the rigidity of the support of the disc roll is ensured, a thinner tube is made possible, and the performance of the piercing and rolling mill is improved while the work of adjusting the position of the disc roll is performed. Performance can be improved. In addition, as described above, not only can the replacement work time be reduced, but it also has a great effect on labor saving of the work itself.

Hereinafter, specific configuration examples of the present invention are shown in FIGS. 3 to 8, and the effects thereof will be described in detail. The same reference numerals are used for members common to the drawings.

FIG. 3 is a diagram showing a configuration example of a mill housing of a piercing mill according to the present invention. The mill housing 5, which constitutes the main body of the piercing mill, has a surface perpendicular to the pass line X--X of the material to be rolled, and a pair of piercing rolls 2 arranged around the pass line. A pair of disk rolls 4 arranged orthogonally and facing each other are accommodated. On a side surface of the mill housing 5, a pair of disc frames 6 which are pivotally supported by a rotating shaft 7 and turn sideways and can be opened are mounted. The inner surface of this disc frame 6 is A body disc roll 4 is supported.

FIG. 4 is a perspective view for explaining an overall configuration in which the disk frame is supported when the disk frame is turned. The disk frame 6 is rotatably supported by a rotating shaft 7 and is rotated by the action of a rotating cylinder (not shown). The replacement of the disk roll is performed with the disk frame 6 rotated. On the inner surface of the disc frame 6, a pair of upper and lower sliding frames 8 and upper and lower opening adjustment frames 10 mounted on the sliding frames 8 are provided to support the disc slot 4 in the vertical direction. .

FIG. 5 is a perspective view illustrating a main part configuration in which a disk roll integrated with a shaft is supported by a disk frame. As shown in an enlarged manner in FIG. 5, a pair of sliding frames 8 including an upper sliding frame 8a and a lower sliding frame 8b are provided on the inner surface of the disk frame 6, and the upper and lower sliding frames 8a, 8b are By the operation of the hydraulic cylinder 9 and the reduction jack 9a, they are provided so as to be slidable in the front-rear direction as indicated by arrows of the width (the hydraulic cylinder for the sliding frame 8a is not shown). ): 丄: Upper opening adjustment frame 10a is provided at the center end of sliding frame 8a, and lower opening adjustment frame 10b is provided at the center end of lower sliding frame 8b. It has become.

On the other hand, the disc roll 4 is formed integrally with the shaft 4s. In FIG. 5, an upper zip 13 is attached to the upper shaft of the disc roll 4, and the upper zip 13 is connected to the chuck frame 11 while supporting the pins. Here, since the built-in chuck 13 is held by the upper chuck frame 11 in the structure of the pin support 13p, it can be rotated in the skew direction by a skew operation described later. Similarly, a lower chock frame 12 having a built-in chuck 13 is attached to the lower shaft while supporting the pins. The upper chuck frame 11 is provided with a screw-down screw support groove 11c into which a screw-down screw of a balance device described later is inserted, and the upper slide frame 8a is provided with an engagement adjustment frame 10a provided in the upper sliding frame 8a. Mated. Further, the lower zipper frame 12 is fitted to the lowerness adjustment frame 10b provided on the lower sliding frame 8b.

In this way, the upper chock 13 and the lower chock 13 are fitted by the pair of upper and lower opening adjustment frames 10 fitted with the bin-supported choke frames 11 and 12 at both ends of the shaft 4s of the disc roll 4. The disc roll 4 is supported at both ends in the vertical direction so as to be up and down. Thereafter, by sliding the pair of upper and lower sliding frames 8 in opposite directions, the chick 13 built in the chick frames 11 and 12 is inclined with the pin support 13p as a fulcrum, and the disc roll 4 is rotated. A predetermined amount of skew angle is set.

FIG. 6 is a diagram schematically illustrating an operation of setting a skew angle of a disc roll. In the above operation, when the upper zip frame 11 is fitted to the upper opening adjustment frame and the lower zip frame 12 is fitted to the door opening adjustment frame, the disc roll 4 is supported at both ends, and the pass line is supported. X—located at Y, — Y HI: perpendicular to X. Next, when the sliding frames are slid in opposite directions, the chuck frames 11 and 12 move in parallel. Along with this, Y ₂ chiyo click 13 which is pin supported lifting the chiyo Kkufu frame 11, 12 a pin support 13p as a fulcrum - inclined along the Y tll, the disk roll 4 located on the Y ₂ _ Y ₂ axis Will do. By such an operation, the disc roll 4 has a predetermined skew angle with respect to the pass line Χ-Χ.

The position adjustment of the disc roll, that is, the height adjustment and the opening degree adjustment, are performed by the balance device provided on the upper sliding frame and the pressing mechanism provided on the pair of upper and lower sliding frames. Figure 7 below shows the relationship between the arrangement of the disc rolls and the height and opening adjustments. As shown. As described above, the sliding of the disk roll in the front-rear direction is performed by the operation of the hydraulic cylinder and the screw-down jack provided on the upper and lower sliding frames.

FIG. 7 is a longitudinal sectional view showing a configuration example of a pair of disk rolls arranged to face the mill housing. In FIG. 7, the material to be rolled 1 is traveling while rotating in the direction perpendicular to the paper surface, and a pair of disk ports 4, 4 are arranged to support the material. At this time, with the perforations of the strip 1, the disk rolls thrust preparative force F, and the rolling force F ₂ is loaded. Since the configuration of the pair of disk rolls 4 and 4 ′ is the same except for the load condition of the thrust force F, the disk rolls 4 arranged on the left side of the pair of disk openings will be described below. The structure and operation of will be described.

As described above, the chuck frames 11 and 12 attached to the shaft 4s of the disc roll 4 are held at both ends by a pair of upper and lower sliding frames 8a and 8b via the opening adjustment frames 10a and 10b. Due to the structure, the scroll 4 is securely supported at both ends, and sufficient support rigidity can be obtained.

The balance device 14 for adjusting the height of the disc roll 4 includes a screw-down (or screw-up) screw 15 and a pull-back 16. The screw-down screw 15 is installed on the upper opening adjustment frame 10a, and the pull-back 16 is on the upper. Equipped on sliding frame 8a. In FIG. 7, the screw-down screw 15 is configured to be installed on the upper opening adjustment frame 10a, but it can be installed on the upper sliding frame 8a.

The height position of the disc roll 4 is set by the amount of reduction of the reduction screw 15. That is, the screw-down screw 15 is inserted into the screw-down screw support groove 11 c provided in the upper chuck frame 11, and adjusts the vertical position of the disc door 4. At this time, in order to apply a preload to the disc roll 4, the pullback 16 is inserted into the support groove 13c provided in the upper chock 13 as shown by the arrow in the figure, and the pulling direction of the pressing screw 15 is Apply pressure in the opposite pulling direction

- Ten -

Claims

You. This operation is a so-called “gas kill”, and the height is adjusted by absorbing the gas, so that the adjustment accuracy of the disc roll 4 can be improved. As described above, in the disk roll 4 shown on the right of FIG. 7, the thrust force F, which is received from the rolled material 1, is in the opposite direction, so the preload load direction is opposite to that of the disk roll 4. Becomes Other structures and functions are the same for the left and right disc roll structures.

The pressing mechanism 17 for adjusting the degree of disc roll 4 is composed of a pressing (or lifting) screw 15 and a pull-back (not shown), like the balancing device 14, and is formed into a pair of upper and lower sliding frames. Each is arranged. Therefore, adjustment of the opening position of the upper part or the lower part of the disk roll 4 is performed independently by the amount of reduction of the reduction screw 15. In addition, at this time, since the position adjustment is performed in a state where the gas is absorbed by the action of the pull-back, the accuracy of the adjustment work can be remarkably improved. During piercing and rolling, the disc frame is closed and must be firmly fixed to the mill housing. Therefore, in the piercing mill according to the present invention, as shown in FIG. 4 described above, the fixing in the height direction is performed by the rotating shaft 7 that supports the disk frame 6 and the clamping means 18 provided on the disk frame 6. This is done by On the other hand, the turning direction of the disc frame is fixed by a clamp device 19 arranged in the mill housing 5 at the closed position of the disc frame.

FIG. 8 is a diagram showing a configuration example of a clamp device arranged at a closed position of a disc frame for fixing to a mill housing. The clamp device 19 is composed of a hydraulic cylinder 19a, a clamp lever 19b, a clamp 19c, and a clamp block 19d. The operation of the hydraulic cylinder 19a causes the clamp lever 19b and the clamp lever 19b to be moved through the clamp block 19d attached to the disc frame. The turning direction of the disc frame is fixed by the clamp 19c. <At this time, in order to prevent the radius of the disc frame 6 due to its own weight, the horizontal

-1 1- It is advisable to provide one Industrial applicability

ADVANTAGE OF THE INVENTION According to the piercing-rolling mill which concerns on this invention, the workability of the position adjustment accompanying a disk jar exchange can be improved, without using an overhead crane, and the skew angle setting of a disk roll is simple and reliable. Because it is possible, a thinner tube can be made. In addition, since the structure is capable of supporting the disk opening integral with the shaft, sufficient support rigidity can be ensured, and the disk roll does not run out during piercing and rolling, and the surface defects of the rolled material Prevents occurrence.

Further, since the piercing mill according to the present invention is equipped with an excellent position adjusting mechanism and a clamping mechanism, the workability and setting accuracy of the position adjustment of the disc roll are maintained without lowering the function of the piercing mill. The workability of the day scroll replacement work can be improved.

Therefore, the piercing and rolling mill according to the present invention can be widely used in a field oriented to efficient production of a seamless steel pipe.

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