WO2005102549A1

WO2005102549A1 - Punch device for u-press in uoe steel tube manufacturing process

Info

Publication number: WO2005102549A1
Application number: PCT/JP2005/007219
Authority: WO
Inventors: Hidenori Shitamoto
Original assignee: Sumitomo Metal Industries, Ltd.
Priority date: 2004-04-21
Filing date: 2005-04-14
Publication date: 2005-11-03
Also published as: CN100415401C; ATE510637T1; EP1792669A4; EP1792669B1; JP4479327B2; EP1792669A1; JP2005305501A; CN1942261A

Abstract

A punch device for U-press in a UOE steel tube manufacturing process capable of coping with the various manufacturing tube sizes and reducing the width of a U-tube after U-press less than that by a conventional punch device for U-press. The punch device (100) used in the UOE steel tube manufacturing process comprises a first punch part (10) having semi-cylindrical press faces (11) and (11) on both side-faces, a second punch part (20) disposed in contact with the lower side of the first punch part (10) and having semi-cylindrical press faces (21) and (21), which are the same as or different from the press faces (11), on both side-faces, and a third punch part (30) disposed in contact with the lower side of the second punch part (20) and having a downward semi-cylindrical press face (31).

Description

Specification

Punch device for U press in UOE steel pipe manufacturing process

Technical field

The present invention relates to a U-press punch device used in a process of manufacturing a steel pipe manufactured by the UOE method.

Background art

[0002] UOE steel pipe is a steel pipe mainly used for a line pipe for a pipeline for transporting oil, natural gas, and the like, and its name is derived from a typical manufacturing process of the steel pipe. The manufacturing process of UOE steel pipe, which is roughly divided into about 20 processes, is a process of applying a bent tube to the end of a steel plate, a process of obtaining a U tube by U tube, and The process includes the process of obtaining an open pipe by O-processing, and the steel plate processed by these processes becomes a product (UOE steel pipe) through a welding process, an expanding process, an inspection process, and the like.

[0003] Among the above processes, the C processing step of UOE steel pipe is a step of performing bending work near the end in the width direction of the steel sheet in accordance with the diameter of the steel pipe. It aims to suppress peaking that remains as a part. In the U processing step after the C processing, the flat plate is processed into a U-tube shape using a press having an open die (U press), so that the plate can be conveyed into the equipment in the O processing step. Then, in the O processing step, a U-tube after the U processing step is formed into an O shape using a press having a closing die (O press). At this time, in order to improve the dimensional accuracy, the pipe at the time of the O-press is given a slight restriction.

Steel pipes that have been internally and externally welded after O processing often do not yet meet the dimensional requirements for the diameter and roundness of the product steel pipe, so they are straightened by pipe expansion (cold mouth expansion processing) after the welding process. In this pipe expansion step, residual stress due to the above-mentioned processing and welding steps is removed by giving plastic elongation to the entire thickness of the steel pipe.

[0004] Since UOE steel pipes manufactured through such processes have a wide variety of pipe manufacturing sizes, usually, each apparatus in the C processing, U press, O press, and expansion, according to the pipe manufacturing size. Need to change each tool. However, in the U press, It takes a lot of time to replace U-punches, and it takes a lot of money to make U-punches for each pipe size. Therefore, a U-punch that can handle multiple pipe sizes is required.

[0005] Research on U punches that can handle multiple pipe sizes has been performed so far. For example, Patent Literature 1 discloses a technique relating to a U-punch device capable of freely adjusting the dimensions of a punch by adjusting a cylinder attached to the U-punch. According to this U-punch device, punches need not be replaced when manufacturing tubes with similar steel pipe sizes, and if processed with this device, the shape of the tubes after u-pressing can be maintained constant. I have.

[0006] Patent Document 1: JP-A-59-109116

Disclosure of the invention

Problems to be solved by the invention

[0007] However, since the punch provided in the U punch device disclosed in Patent Document 1 has only two types of punches having different curvature radii, a U-press system using a rocker assembly system is used. In such a case, there was a problem that sufficient bending could not be applied to the pipe.

On the other hand, in recent years, demand for high-strength line pipes capable of withstanding high-pressure transportation has been increasing in order to improve transportation efficiency. When such a high-strength material is processed by a conventional U punch device, the amount of springback (bending back) after the U press becomes large. If it is too large, there is a problem that the U-tube cannot be transported into the O-press device.

[0009] Therefore, the present invention provides a UOE steel pipe manufacturing method capable of supporting various pipe sizes and reducing the width of the U pipe after the U press as compared with a conventional punch machine for a U press. It is an object of the present invention to provide a punching device for U-presses in the process.

Means for solving the problem

Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

[0011] The invention described in claim 1 is intended for use in the production process of UOE steel pipe. A press punching device (100), comprising a first punch portion (10) having semi-cylindrical press surfaces (11) and (11) on both sides, and a lower portion of the first punch portion (10). The second punch part (20), which is arranged and has a semi-cylindrical press surface (21), which is the same or different from the press surface (11), on both sides, and under the second punch part (20). The above-mentioned object is achieved by a punching device (100) for U-press, characterized by having a third punching part (30) provided in contact with and having a downward semi-cylindrical press surface (31). .

[0012] According to the invention set forth in Claim 1, the U-punch punch device (100) is capable of reducing the U-tube width after the U-press as compared with the conventional U-press punch device. Can be provided.

[0013] The invention described in claim 2 is a punching device (100) for a U press according to claim 1, wherein the first punch portion (10) and the Z or the second punch portion (20) are provided. ) Pressing surface (11), (11) and Ζ or (21), (21) The distance between (21) can be enlarged or reduced.

[0014] According to the invention set forth in claim 2, it is possible to reduce the width of the U pipe after the U press as compared with the conventional punching apparatus for the U press, and to realize various pipe sizes. It is possible to provide a punching device (100) for U-press which can cope with the above.

The invention's effect

[0015] According to the present invention, a UOE steel pipe manufacturing process capable of coping with various pipe sizes and reducing the U pipe width after U pressing compared to a conventional U punch device. A pressing punch device can be provided.

Brief Description of Drawings

FIG. 1 is a schematic view showing an embodiment of a punch device of the present invention.

FIG. 2 is a schematic diagram of a U pipe width.

FIG. 3 is a schematic view showing an example of a form of a conventional punch device.

FIG. 4 is a view showing an embodiment of a U-press using a conventional punch device.

FIG. 5 is a view showing a form example of a U press using the punch device of the present invention.

FIG. 6 is a schematic view of a U machining process using the punch device of the present invention.

FIG. 7 is a schematic view showing an embodiment of a punch device of the present invention. FIG. 8 is a schematic view of a U-press punch device to which the present invention is applied.

Explanation of symbols

[0017] 5 U tube

10 1st punch part

11, 21, 31 Press surface

20 2nd punch part

30 3rd punch

Punch device for 100, 200 U press

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is a schematic view showing a first embodiment of the present invention, which is applied to a U-press punch device.

The punch device 100 for U-press of the present invention includes a first punch portion 10, a second punch portion 20, and a third punch portion 30. The first punch section 10 has semi-cylindrical press surfaces 11 and 11 having a radius of curvature R1 on both sides, and the second punch section 20 disposed below and in contact with the first punch section 10 has a radius of curvature. R2 semi-cylindrical press surfaces 21, 21 are provided on both sides. The third punch portion 30 is disposed below and in contact with the second punch portion 20, and has a downward semi-cylindrical press surface 31 having a radius of curvature of 3.

By making the punching device for U-press of the present invention a powerful structure, as described later, it becomes possible to deform the U-tube more effectively than before, so that the U-tube width after U-pressing is reduced. It is possible to reduce it more than before. Figure 2 shows a schematic diagram of the U-tube width. In the following, the U pipe width means the maximum width of the U pipe 5 in a direction perpendicular to the pipe axis direction of the U pipe 5 and in a horizontal direction.

FIG. 3 schematically shows a configuration example of a conventional punch device in order to facilitate the description of the punch device in the present invention. The conventional punch device includes a pair of punches A having a semi-cylindrical steel tube pressing surface and a punch B having a downward semi-cylindrical steel tube pressing surface.The radius of curvature of the pressing surface of the pair of punches A is as follows: At least larger than R1 and R2. Figure 4 shows a U-shaped rocker assembly system using a conventional punch device. 1 shows a schematic view of a press. In the U-press according to this method, in addition to the punch device, a pair of rocker dies 50, 50 are used to process the U pipe 45, and the pair of rocker dies 50, 50 are respectively formed with rocker shoes 51, 52, Also, it has a rotation center 53 that is immovable during processing.

In a U-press using a conventional punching device, the side surfaces of the U-tube 45 (partial force at which the U-tube contacts the punch A) are formed by the pair of rocker dies 50, 50 and the press surfaces provided on the pair of punches A. Since the shape of the U-tube 45 is determined, it was difficult to sufficiently deform the side of the U-tube 45. In particular, when the U-pipe 45 processed by using the conventional punch device is a high-strength material, the amount of springback after the U-press is likely to increase if the U-press is not sufficiently deformed. If the amount of springback increases, it becomes difficult to transport the U-tube after the U-processing into the O-press device, and the productivity of the steel tube decreases. On the other hand, it is said that by sufficiently reducing the width of the U-tube in the U-tube, it is possible to obtain a U-tube that can be transported directly into the O-press device after the U-roll. Therefore, in the present invention, by performing a U-press using a punch device having three types of punches, the U-tube width is reduced as compared with the conventional one, and a U-tube that can be directly conveyed into the O-press device is obtained. I have.

FIG. 5 is a schematic view of a U-press using a rocker assembly system using the punch device 100 of the present invention. In the U-press by this method, the steel sheet that has gone through the C-Kaney process is deformed by the punch device 100 and the rocker dies 50, 50 so that the cross-sectional shape becomes U-shaped. The punch device 100 of the present invention includes three punch portions 10, 20, and 30, while the rocker dies 50, 50 respectively have rocker shows 51, 52, and a rotation center 53 that is stationary during processing. It has.

In the U-press shown in FIG. 5, the side of the U-tube 5 has a pair of press surfaces 11, 11, and 21, 21, which are provided on the punch portions 10 and 20, and is arranged side by side. 52 【It is deformed. In the punch device 100 of the present invention, the radii of curvature R1 and R2 of the press surfaces provided in the punch portions 10 and 20 are determined by the punch (hereinafter referred to as “punch 8”) which has contributed to the deformation of the U tube side portion in the conventional punch device. ) Is smaller than the radius of curvature of the pressed surface. In addition, a pair of pressing surfaces 11 and 11 provided in the Bending can be applied to a portion closer to the end of the U-tube as compared with the punch device. Therefore, by performing the U-press using the punch device 100 of the present invention, the side portion of the U-tube 5 can be effectively deformed, so that the spring-back amount of the U-tube can be suppressed as compared with the conventional case. And the width of the U-tube can be reduced.

As described above, by performing the U-tube processing using the divided press surfaces having a small radius of curvature, it is possible to perform the processing capable of reducing the U-tube width as compared with the related art. On the other hand, in the conventional punching device, when a U-tube having a required pipe size is reduced by reducing the radius of curvature of the press surface of the punch A, the punch A is required to reduce the radius of curvature of the press surface. Since it is necessary to reduce the size of the punch A itself, it is necessary to replace the punch A with a smaller radius of curvature. On the other hand, since the punch device 100 of the present invention includes the punch portions 10 and 20 having the press surfaces having a smaller radius of curvature than the press surface of the punch A, the punch device 100 has different sizes and materials such as wall thickness. Even in the case of manufacturing, it is only necessary to increase or reduce the distance between the press surfaces in the punch portions 10 and 20, and it is not necessary to replace the punch A with one having a small radius of curvature. Therefore, if the U-press is performed by the U-press apparatus 100 of the present invention, the U-tube width can be more easily reduced than before. In addition, as described above, by performing the U-tube processing using the punch device 100 of the present invention, the U-tube width can be reduced as compared with the conventional case. The steel pipe can be easily transported inside, and the productivity of steel pipes can be improved.

[0022] The punching device 100 for U-press of the present invention may be an integrated punching device provided with punching parts 10, 20, and 30, but for example, is constituted by different parts for each punching part. Alternatively, a punch device including a plurality of members may be used.

FIG. 6 shows a schematic view of a U machining process by the rocker assembly method using the punch device 100 of the present invention. The steel sheet whose steel sheet end has been processed in the C processing step is conveyed between a pair of rocker dies 50, 50 and the punch device 100, and the rocker dies 51, 51, and the third punch section 30 of the rocker die. (Fig. 6 (a)). Then, the steel sheet is gradually processed into a U-shape by moving the punch device 100 from top to bottom (gravity direction) (FIG. 6 (b)). With the movement of the device 100, the rocker dies 50, 50 rotate around the rotation centers 53, 53 when the steel plate comes into contact with the rocker shroud 52, and the U processing of the steel plate proceeds. . When the steel sheet is cut into a U-shape in this way, the processed U-shaped steel sheet is further added to the rocker dies 51, 51 and 52, 52 of the rocker die and the punch portion of the punch device 100. It is sandwiched by 10, 20, and 30, and is finally processed into a U-tube with a shape that can be transported into the O-press device in the O-processing step (Fig. 6 (c)).

FIG. 7 is a schematic view showing a second embodiment of the present invention, which is applied to the U-press punch device.

The punch device 200 of the present invention includes a first punch section 10, a second punch section 20, and a third punch section 30. Of these punch portions, the first punch portion 10 and the second punch portion 20 arranged below and in contact with the punch portion 10 are semi-cylindrical press surfaces 11 having a radius of curvature R1 provided on both side surfaces thereof. , 11, and the distance between the semi-cylindrical press surfaces 21, 21 having a radius of curvature R2 can be enlarged or reduced. The third punch portion 30 disposed below and in contact with the second punch portion 20 has a downward semi-cylindrical press surface 31 having a curvature radius force of 3.

In the description of the punching apparatus 200 according to the second embodiment of the present invention, the direction perpendicular to the paper of FIG. 7 is referred to as the “tube axis direction” of the U-tube pressed by the punching apparatus, and the direction of FIG. The left-right direction on the paper is described as the “left-right direction” of the U-tube.

[0025] The punch device 200 of the present invention is provided with a first screw 15 and a second screw 25 as punch moving means at ends of the first punch portion 10 and the second punch portion 20 in the tube axis direction. . In the device 200, the distance between the press surfaces 11, 11, and 21, 21 in the first punch portion 10 and the second punch portion 20 is increased by rotating the first screw 15 and the second screw 25. Z can be reduced. For example, when the diameter of a pipe is large, the screws 15 and 25 are rotated clockwise to increase the distance between the pair of press surfaces 11, 11 and 21, 21. When the diameter of the pipe is small, the distance between the pair of press surfaces 11, 11, and 21, 21 is reduced by rotating the screws 15 and 25 counterclockwise. Each pressing surface can be moved in the direction in which the pressing is performed.

Here, the form of the punch device 200 of the present invention is not limited to the form in which the distance between the press surfaces of the first punch part 10 and the second punch part 20 can be enlarged and reduced as described above. The distance between the press surfaces in only one of the 10 It can be in a small form.

If the punch device of the present invention is configured as described above, it is possible to obtain a punch device 200 in which two or less punch portions can expand and reduce the distance between the press surfaces. In particular, by setting the pressing surface to move in the left-right direction of the U-tube, it is possible to easily deform U-tubes of various pipe-making sizes using one punch device 200. Further, since the punch device 200 includes the three punch portions 10, 20, and 30, the amount of springback after the U-press is reduced as in the punch device 100 according to the first embodiment of the present invention. It can also be done. Therefore, according to the present invention, in the UOE steel pipe manufacturing process, it is possible to cope with various pipe sizes and reduce the U pipe width after the U press compared to the conventional U punch device. A punching device 200 for U-press can be provided.

In the present invention, the relationship between the direction of rotation of the screw and the direction of movement of the press surface is not limited to the above-described embodiment. Further, the punch moving means provided in the punching device for U-press of the present invention is not limited to a screw, and can be suitably used as long as it is a means capable of effectively moving each punch, not limited to a screw. Further, the punching device 200 for U-press of the present invention may be an integrated punching device including the punch portions 10, 20, and 30. The bonding device may be a member device having a high strength.

Example

Hereinafter, the present invention will be described based on examples.

UOE steel pipe with an outer diameter of 609.6 mm and a thickness of 14 mm (hereinafter referred to as “test steel pipe 1”), and a UOE steel pipe with an outer diameter of 711.2 mm and a thickness of 14 mm (hereinafter referred to as “test steel pipe 2”). The test was performed under the following conditions. In the following tests, the U-press method of the rocker assembly method was used, and the number of U-press times was one. The yield stress of the test steel pipes 1 and 2 was 750 MPa.

[0028] (Condition 1)

The U-press of the test steel pipes 1 and 2 was performed using the punch device for U-press of the present invention provided with the punch moving means. FIG. 8 shows a schematic view of a U-press punch device to which the present invention is applied. A punch device that works under this condition is designed to form a pair of semi-cylindrical press surfaces with a radius of curvature R1. A first punch portion 10, a second punch portion 20 having a pair of semi-cylindrical press surfaces with a radius of curvature R2, and a third punch portion 30 having a downward semi-cylindrical press surface with a radius of curvature R3, and a A first screw 15 and a second screw 25 are provided. In FIG. 7, XI and X2 indicate the amount of movement (slide amount) of the press surface in the first punch portion 10 and the second punch portion 20 in the horizontal direction.

[0029] Table 1 shows the values of the radii of curvature Rl, R2, and R3 of each punch in the punch device used in the present embodiment, the sliding amount XI of the first punch portion 10, and the sliding amount of the second punch portion 20. The value of the quantity X2 is also shown.

[Table 1]

Here, the fact that XI and X2 are positive values means that each punch has been moved in the direction in which the space between the pair of press surfaces in each punch expands (hereinafter referred to as “enlargement direction”). In addition, the fact that these values are negative values means that each punch portion has been moved in a direction opposite to the above-described direction (hereinafter, referred to as a “reduction direction”). Also, under this condition, the U-press of two test steel pipes was performed using one punch device, so the radius of curvature of the press surface at each punch section provided in the punch device was the same in test steel tubes 1 and 2. Was the value of

[0031] (Condition 2)

U-pressing of test steel pipes 1 and 2 was performed using a conventional punch device (see Fig. 3) equipped with two types of punch parts having different shapes. Table 2 shows the radius of curvature of the pressed surface at each punch used when performing U-pressing on test steel pipes 1 and 2.

[Table 2] Test steel pipe 1 Test steel pipe 2

r1 (mm) 1 90 230

r2 (mm) 1 10 1 40 In Table 2, rl and r2 represent the radii of curvature of the press surfaces of the punches A and B shown in FIG. 3, respectively.

[0033] (Result)

The punch device according to the condition 1 (hereinafter, referred to as “Example”) includes the first punch portion 10 and the second punch portion 20 having a pair of movable press surfaces. When pressing the test steel pipe 2, the pair of press surfaces in each punch part are moved in the reduction direction, and when pressing the test steel pipe 2, the pair of press faces in each punch part are moved in the enlargement direction. Was. By moving each press surface in this way, the punch device of the present invention according to the embodiment was able to cope with a plurality of pipe sizes. Further, in the punch device of the present embodiment, it was necessary to replace the punch portion even if the pipe production size was different. For this reason, in the present embodiment, the time for punch replacement at the time of changing the steel pipe size, which was required in the conventional punch device, could be shortened.

On the other hand, the punch device used in condition 2 (hereinafter, referred to as “comparative example”) has a force that cannot be applied to two steel tubes (test steel tubes 1 and 2) with one punch device. Therefore, the punch used was changed for each steel pipe. Therefore, time for punch exchange is required.

[0034] Table 3 shows the U tube widths after the U press according to the examples and comparative examples. Table 3 shows the normalized values obtained by dividing the width of the U tube by the width of the O press device (O press die diameter).

[Table 3]

From Table 3, it can be seen that the U-tube after the U-press, which is used in the present example using the punching device of the present invention, has a width smaller than the O-press die diameter in both the test steel tubes 1 and 2. The value was less than 1. Therefore, the U pipe after the U press using the punch device of the present invention could be directly conveyed into the O press device after the U press, even if the U pipe width was smaller than the O press die diameter. On the other hand, in the U-press in the comparative example, it was difficult to prevent spring back of the U-tube, so the value in Table 3 exceeded 1, and the U-tube width after the U-press became larger than the O-press die diameter. Was. Therefore, in this comparative example, it was impossible to directly transfer the U-tube into the O-press device after the U-press in both of the test steel tubes 1 and 2.

From the above, it has been confirmed that the punch device of the present invention can handle steel pipes having different sizes and can reduce the width of the U pipe, and has three types of punches having different shapes, and a punch moving means. The effectiveness of the U-press punching device of the present invention comprising

Claims

The scope of the claims

[1] A punching device for a U press used in a production process of a UOE steel pipe,

A first punch portion having a semi-cylindrical press surface on both sides,

A second punch portion that is disposed in contact with the lower portion of the first punch portion and has a semi-cylindrical press surface that is the same as or different from the press surface on both side surfaces;

A third punch portion disposed below and in contact with the second punch portion and having a downwardly facing semi-cylindrical press surface;

A punch device for U-press, characterized by having:

[2] The punch for a U press according to claim 1, wherein the first punch portion and the Z or the second punch portion are capable of increasing or reducing the distance between the press surfaces. Equipment