JPH05212440A - Manufacturing equipment for electrically resisting welded square tube - Google Patents

Abstract

PURPOSE:To shift the position of a seamed part to the side by arranging cylindrical rolls vertically right and left so as to pass a forming base material between them in such a manner that their positions can be adjusted vertically and horizontally and changing arbitrarily the angles of frames which support the rolls. CONSTITUTION:A turning frame 23 can be inclined by the forward or backward revolution of a drive motor through a rotary drive gear. When this inclination angle is changed, the position of the seamed part of a tube can be changed arbitrarily in the right and left direction and the seamed part can be avoided. Further, the rotary axis of a roll 27 is inclined by the inclination of the turning frame 23 and force is transmitted securely by a universal joint 43. Consequently, the position of the seamed position can be shifted by an arbitrary distance from the center of the flank to the side and when a square tube is used to a building, etc., the seamed part can be shifted from the worked position of a bolt hole and a welded position, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square tube manufacturing apparatus for forming a circular tube by electric-welding a band-shaped metal plate and further forming a welded portion (seam portion) on the same side in a square tube manufacturing apparatus. The present invention relates to a technology that allows changing the position.

[0002]

2. Description of the Related Art Conventionally, a technique for manufacturing a square tube has been publicly known. First, as shown in FIG. 11, a material 1 in which a long strip-shaped metal plate is continuously wound into a coil is used as an uncoiler. It is rewound sequentially by 2, leveled by the leveler 3, further inserted into the roll forming machine 4, formed into a circular pipe as shown in FIG. 12, and then formed into a rectangular pipe. As shown in FIG. 13, the roll forming machine 4 sequentially arranges rolls 5a, 5b, 5c ... With different radii of curvature, and gradually reduces the radii of curvature of the rolls 5a, 5b, 5c. (B to e), the circular arc shape is approached to a circle, the end faces on both sides are aligned and the edge portion 1a is electrically heated to a molten state, and immediately crimped by the crimp rolls 6 and welded. The material is welded to form a circular shape (f), and the material is passed through a cooling device to lower the temperature of the seam (welding) portion while running in the traveling direction. By passing it through a squeezing roll so that it falls within the standard range, a circular cross section with a predetermined circular length accuracy is finished. Then, it is formed into a rectangular shape by the square tube molding machine shown in FIG.
14a, 7b, 8a, 8b ... are arranged vertically and horizontally, and these rolls 7a, 7b, 8a, 8b ... Are passed (gh) to form a desired rectangular cross section, and FIG. A square tube 1'as shown is obtained.

In the square tube thus formed, the seam portion 1b obtained by welding the edge portion 1a is always located at the center of the upper surface as shown in FIG. 14, and when used in a building structure or a mechanical structure, a bolt is used. When passing through, etc., a hole is formed almost in the center as shown in FIG. In such a case, the seam portion 1b is slightly thicker than the base metal, and the thickness is not uniform on the back side, so that the center of the hole is displaced or the drill wears faster, which causes a problem. There was.
Therefore, it is desirable to shift the position of the seam portion.

[0004]

Therefore, as shown in FIGS. 17 and 18 so as to shift the position of the seam portion, the roll is formed into a V shape which is displaced in a sectional view so that the roll is inclined. Can be molded into a square tube,
The position of the seam portion can also be formed at a position displaced from the center. However, with such a technique, the position of the seam portion is determined by the shape of the roll, and it is not possible to match the size of the hole to be bored. Also, if the dimensions of the square tube are different, There is a drawback in that a dedicated roll is required, and when the roll is replaced, the cost required for the roll tool and the replacement work becomes very large. Therefore, it is an object of the present invention to provide a molding apparatus that facilitates roll change and seam position change.

[0005]

According to the present invention, in order to solve such a problem, a strip-shaped steel sheet is formed into a circular shape, and the edges are butted to each other and electroformed to form a circular steel pipe, which is then formed into a square shape. In a square tube manufacturing apparatus, cylindrical rolls through which the forming base material is passed are arranged so that their positions can be adjusted vertically and horizontally, and the frame that supports the rolls vertically and horizontally can be arbitrarily changed in angle. is there.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems to be solved by the present invention and the means for solving the problems are as described above. Next, the structure of the embodiments shown in the accompanying drawings will be described. FIG. 1 is a front view of the whole square tube manufacturing apparatus of the present invention, FIG. 2 is a front view of a main portion, FIG. 3 is a front sectional view of an enlarged view, FIG. 4 is a side sectional view of the same, and FIG. FIG. 6 is a diagram showing a manufacturing process, and FIG.
FIG. 8 is a view showing a changed range of a seam portion, FIG. 8 is a front view after manufacturing, FIG. 9 is a perspective view of the same, and FIG. 10 is a front view of a state in which a square tube manufacturing apparatus is inclined.

The process for producing a circular steel pipe from a long strip-shaped metal plate, which is a pre-process for producing a square pipe, is shown in FIGS.
As described above, the tube 10 formed in a circular shape with a predetermined precision is inserted into a square tube manufacturing apparatus, and the square tube manufacturing apparatus is composed of several stages of molding apparatus, and one of the molding apparatuses will be described. Then, as shown in FIGS. 1 to 5, a fixed stand 12 is erected on the bed 11, and the fixed stand 12 has a rectangular opening 12a at the center as shown in FIG. An inner stand 13 is disposed inside, and a liner 14 is attached to the inner side surface of the opening 12a so that the inner stand 13 can be moved up and down.

An elevating screw 19 is rotatably provided at the center of the lower surface of the inner stand 13, and a worm wheel 15 is screwed to the elevating screw 19, and a lower portion of the worm wheel 15 is a supporting portion of the fixed stand 13. 12b is supported via a bearing 17, the worm wheel 15 meshes with the worm 16, and the worm 16 is fixedly mounted on the rotating shaft 20a of the lifting motor 20. Inner stand 13
It is possible to move up and down so that the upper warp or the lower warp can be corrected when the pipe 10 is formed.

A shaft portion 23a of a revolving frame 23 is rotatably supported in the center of the inner stand 13 via a bearing metal 22, and a revolving plate 23b is provided at the end of the revolving frame 23a. A swivel drive gear 24 is fixedly mounted on the rotary drive gear 24, and the swivel drive gear 24 meshes with a gear 28 on a drive shaft of a drive motor 25 fixed to the inner stand 13 to rotate the swivel frame 23.

On the front surface of the revolving frame 23, there are arranged upper, lower, left and right rolls to be formed into a square tube, and the positions of the respective rolls can be adjusted. As shown in FIG. 1, FIG. 2 and FIG. Since the cylindrical rolls 26, 26 and the upper and lower rolls 27, 27 are symmetrically arranged, one of them will be described. The roll 26 is rotatably supported by a support shaft 30 via a bearing 29. The shaft 30 is fixed to a slide frame 31, the slide frame 31 is pivotally supported at the tip of a screw shaft 32, the screw shaft 32 is screwed to a worm wheel 33, and the worm wheel 33 is rotatably supported by a gear box 34. And is meshed with the worm 35. Further, a spiral gear 36 is fixedly mounted on the worm shaft 35a, meshes with a spiral gear 39 connected to a connecting shaft 37, and the connecting shaft 37 is connected to a drive shaft of a motor 40 for left / right position adjustment. The position of the left and right rolls 26 can be adjusted simultaneously with one motor. However, since the rolls 30 are configured to move in mutually opposite directions, one of the screw shafts 32 needs to be a reverse screw.

The vertical roll 27 is fixedly mounted on the rotary shaft 42, and one end of the rotary shaft 42 is connected to the drive shaft of the motors 41, 41 via universal joints 43, 43 so that the roll 27 can be vertically moved. The power for sending the pipe 10 can be transmitted even when the pipe 10 is moved or turned. However, the upper and lower rolls 27, 27 are rotated in opposite directions. Both sides of the rotary shaft 42 are rotatably supported by a slide frame 44, and the slide frame 4
4 is pivotally supported on the tips of the screw shafts 45, 45 arranged in parallel,
The screw shafts 45, 45 are screwed onto worm wheels 46, 46, and the worm wheels 46, 46 are rotatably supported by gear boxes 47, 47 and mesh with the worms.
A spiral gear on the worm shaft of the worm is interlocked with a drive shaft of a motor 49 for vertical position adjustment via a spiral gear on a connecting shaft 48, and the roll 27 can be vertically adjusted by driving the motor 49. Of. However, although a worm wheel or a spiral gear is used as a power transmission means for sliding the slide frame from the motor for adjusting the position of the rolls 26 and 27, it is not limited, and a bevel gear, a ball screw or the like is used. Alternatively, it can be driven directly from a motor, or can be configured to adjust the position using a hydraulic cylinder or the like.

With the above-mentioned structure, the worm wheel 33 is rotated through the spiral gears 36 and 39 and the worm 35 by rotating the motor 40 in the normal direction or the reverse direction to slide the screw shaft 32 in the left and right direction. By moving, the roll 26 axially supported by the slide frame 31 can change the length between the rolls 26 and 26 in accordance with the diameter of the pipe 10 and the desired width of the rectangular pipe, and the motor 49 can rotate normally. Alternatively, by reversing, the worm wheel 46 is rotated through the spiral gear and the worm to slide the screw shaft 45 in the vertical direction, so that the roll 27 pivotally supported by the slide frame 44 has the diameter of the pipe 10 and a desired value. According to the height of the square tube of
The length between the rolls 27 can be changed.

By rotating the drive motor 25 in the normal or reverse direction, the swing frame 23 can be tilted as shown in FIG. 10 via the swing drive gear 24.
By changing this inclination angle α, the pipe 10
The position of the seam portion 10a can be arbitrarily changed in the left-right direction, and the seam portion 10a can be avoided even when holes are formed as shown in FIG. Although the turning shaft 42 of the roll 27 also tilts due to the tilting of the revolving frame 23, the universal joint 43 can handle this and power can be reliably transmitted. And the motor 20
The inner stand 13
The position can be adjusted up and down, and when an upper warp or a lower warp occurs, it can be corrected.

[0014]

Since the present invention is constructed as described above, the present invention has the following effects. That is, when forming an electric resistance welded steel pipe into a square pipe, the position of the seam portion can be shifted laterally from the center of the side by an arbitrary distance, and when the square pipe is used for a building, etc. It can be removed from the hole processing position or welding position, etc., the position does not shift due to the seam part, welding can be easily performed without raising the temperature etc., and the strength is also the specified strength It will be possible. Further, since the position of the seam portion only needs to be changed by changing the inclination angle, it is possible to omit the work of the rolled steel pipe and the like, and it is possible to achieve labor saving and cost reduction.

[Brief description of drawings]

FIG. 1 is an overall front view of a square tube manufacturing apparatus of the present invention.

FIG. 2 is a front view of the main part of the same.

FIG. 3 is an enlarged front sectional view of the same.

FIG. 4 is a side sectional view of the same.

FIG. 5 is a front sectional view of a stand portion.

FIG. 6 is a diagram showing a manufacturing process.

FIG. 7 is a diagram showing a changed range of a seam portion.

FIG. 8 is a front view after manufacturing.

FIG. 9 is a perspective view of the same.

FIG. 10 is a front view of a state where the square tube manufacturing apparatus is tilted.

FIG. 11 is a schematic view of a steel pipe manufacturing apparatus.

FIG. 12 is a perspective view showing a state where the strip plate is formed into a square tube.

FIG. 13 is a diagram showing a manufacturing process of a conventional rectangular tube.

FIG. 14 is a front view of a conventional square tube.

FIG. 15 is a perspective view in which a hole is formed in a conventional square tube.

FIG. 16 is a front view of a conventional square tube molding machine.

FIG. 17 is a front cross-sectional view of a conventional square tube forming roll that shifts the seam portion.

FIG. 18 is a front sectional view of another rectangular tube forming roll of the same.

[Explanation of symbols]

 10 tube 23 swivel frame 25 drive motor 26/27 roll 31/44 slide frame

Claims (1)

[Claims] 1. A square pipe manufacturing apparatus for forming a strip steel plate into a circular shape, forming edges into a circular steel pipe by butt-welding the edges to form a circular steel pipe, and then forming the steel pipe into a square shape. An electric resistance welded square tube manufacturing apparatus, characterized in that the frames supporting the upper, lower, left, and right rolls are arranged so that their positions can be adjusted in the vertical, horizontal, and horizontal directions, respectively, and the angles thereof can be arbitrarily changed.