KR101413170B1 - Apparatus for manufacturing of seamless pipe - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing a seamless pipe by friction stir welding an extruded metal material extruded by an extrusion method. The apparatus includes a container receiving the extruded material therein and having an extrusion hole consisting of a plurality of ports; a stem pressing the extruded material to extrude the extruded material through the extrusion hole; a correction mold correcting the extruded material extruded through the extrusion hole into the shape of a metal pipe, and having a metal pipe discharge path discharging the metal pipe outwardly; a plurality of rotary members installed in the correction mold and having at one surface a stir tip inserted in a joint surface formed by abutment of a plurality of metal pieces discharged from the extrusion hole, the rotary members performing the friction stir welding by rotating the stir tip in the state of being in contact with the joint surface; and a driving device distributing and transmitting a rotation driving force to the rotary members.

Description

[0001] Apparatus for manufacturing seamless pipes [0002]

The present invention relates to a technique for manufacturing a metal pipe using an extrusion process, and more particularly, to a process for manufacturing a metal pipe by using an extrusion process while manufacturing a pipe composed of a plurality of metal pieces, To a device capable of manufacturing the same.

Extrusion molding is a molding method in which an extruded material such as a metal billet is compressed in a container and discharged through an extrusion hole into an extruded material having a predetermined shape. These extrusion processes include direct extrusion and indirect extrusion. In the direct extrusion method, the extruded material is produced by discharging the extruded material through an extruded hole disposed on the opposite side of the one end portion while pushing one end of the extruded material. On the other hand, the indirect extrusion method is a method of producing the extruded material by discharging the extruded material in a direction opposite to the direction of pushing the extruded material.

A metal pipe can be manufactured by extrusion molding. In this case, when the direct extrusion method is used, a plurality of metal pieces are bonded again in a solid state after passing through an extrusion hole composed of a plurality of ports in the metal mold for manufacturing a hollow pipe, . In this case, along the longitudinal direction of the metal pipe, the solid pieces are separated into the ports, and the metal pieces passing through the extrusion holes are joined to each other, and a trace of joining is generated, which is called a seam line. For example, in the case of a mold of three extrusion holes composed of three ports, three core lines are formed in the extrusion direction by a direct extrusion process. Since these shim lines are mechanically bonded in the extrusion process, they appear to have been bonded by naked eyes, but they are actually mechanically fragile and easily break when a fluid pressure is generated inside the metal pipe.

In the indirect extrusion method, since the port is not used in forming the metal pipe, a seamless pipe having no shim line, which is a solid state joint inevitably generated in the conventional direct extrusion process, can be manufactured. However, since the indirect extrusion process is performed by a batch process, the process can not be continuously performed, and there is a disadvantage in that it can not exert a large force as compared with the direct extrusion process.

Various mechanical devices used in extrusion molding are placed in a narrow place around the metal pipe and are subject to a local adherence. The mechanical devices include a drive source for supplying power, and these drive sources are typically a motor operated by a magnetic force or a cylinder operated by a working fluid. The greater the number of driving sources, the more difficult the installation due to the limit of the space, the installation cost of the apparatus is increased, the energy efficiency is lowered due to the waste of energy in each driving source.

In addition, in the conventional apparatus for manufacturing a seamless pipe, a large amount of internal parts are subjected to a great force. In particular, when the rotary shaft of the stirring tip performing the friction stir joining is disposed perpendicularly to the advancing direction of the stem, There is a problem that an overload which is biased to only one side of the stirring tip is generated and the stirring tip is bent, broken or easily broken.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a metal mold, To a device for manufacturing a seamless pipe by friction stir welding. In addition, it is possible to reduce the size of the apparatus, thereby reducing the installation space, minimizing the number of driving sources, preventing energy wastage, reducing the manufacturing cost of the apparatus, and enabling the rotation shaft of the stirring tip to move in a direction So that the load caused by the extruded material is uniformly dispersed on the rotary shaft to prevent deformation or breakage of the component, improve durability and operability, and allow the stirring tip to be installed on the calibrating mold, To an apparatus for manufacturing a seamless pipe. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a container comprising: a container accommodating an extruded material therein and having an extrusion hole formed of a plurality of ports; A stem for pressing the extruded material so that the extruded material is extruded through the extrusion hole; A calibration mold including a metal pipe discharge path for calibrating the extruded material extruded through the extrusion hole into a shape of a metal pipe and discharging the metal pipe to the outside; And a stirring tip provided on the calibration mold and inserted into a joint surface in which a plurality of metal pieces to be discharged through the extrusion hole are butted against each other, wherein the stirring tip is rotated in contact with the joint surface, A plurality of rotary members for performing the rotation of the rotary member; And a driving device that distributes and transmits rotational driving force to the plurality of rotating members.

According to an aspect of the present invention, the stirring tip is installed in a direction parallel to the advancing direction of the stem, and may be installed on the front surface of the calibration die.

Further, according to an aspect of the present invention, the drive apparatus includes: a single drive source; And a distributed power transmission apparatus that distributes the rotational driving force of the single driving source to a plurality of rotating members and transmits the divided driving power.

According to an aspect of the present invention, there is provided a distributed power transmission apparatus comprising: a rotary shaft; a plurality of gears, each of which is rotatably installed inside the calibrating mold, And a ring gear connected to the driving source.

Further, according to the idea of the present invention, the ring gear can be engaged with a drive-side spur gear whose outer diameter surface is connected to the drive source.

According to an aspect of the present invention, the ring gear may have a driven pulley connected to the drive source and a driven pulley connected to the drive source on a radially outer surface.

According to an aspect of the present invention, the ring gear may be provided with a driven sprocket wheel connected to a drive sprocket wheel connected to the drive source on a radially outer surface thereof by a chain.

According to an aspect of the present invention, the ring gear may be such that its outer diameter surface is engaged with a drive source side worm gear connected to the drive source.

According to an aspect of the present invention, a plurality of the rotary members may be equally arranged on the inner diameter surface of the ring gear.

According to the embodiment of the present invention as described above, since the shim lines generated in passing through the extrusion holes composed of a plurality of ports in the die in which the extrusion is progressed are manufactured by joining by friction stir joining, It is possible to continuously manufacture the seamless pipes having high strength, to reduce the size of the apparatus, to save the installation space, to minimize the number of the drive sources, to prevent energy waste, to reduce the manufacturing cost of the apparatus, The durability and the operability are improved, and the stirring tip is installed in the calibration mold, so that the assembling and management of the parts can be facilitated. Of course, the scope of the present invention is not limited by these effects.

1 is a schematic cross-sectional view of a seamless pipe manufacturing apparatus according to some embodiments of the present invention.
2 is a front view illustrating a form of a container used in a seamless pipe manufacturing apparatus according to some embodiments of the present invention.
3 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus according to some embodiments of the present invention.
4 is a conceptual view showing the principle of friction stir welding.
5 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus according to some embodiments of the present invention.
6 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus according to some embodiments of the present invention.
7 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus according to some embodiments of the present invention.
8 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus according to some embodiments of the present invention.
9 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus according to some embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.

In the following embodiments, the x-axis, the y-axis, and the z-axis are not limited to three axes on the orthogonal coordinate system, and can be interpreted in a broad sense including the three axes. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

1 is a schematic cross-sectional view of a seamless pipe manufacturing apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 1, a container 110 for loading the extruded material 130 may be provided. For example, the extruded material 130 may be loaded into the container 110 in the form of a metal billet. The container 110 may have a variety of internal structures and shapes to accommodate the extruded material 130. Therefore, the shapes of the extruded material 130 and the container 110 can be variously modified, and the scope of this embodiment is not limited.

The stem 112 may be disposed within the container 110 so that the extruded material 130 in the container 110 can be pushed in and compressed. For example, for effective compression of the extruded material 130, the contour of the stem 112 may be tailored to the interior shape of the container 110. As another example, the outer shape of the stem 112 may not match the shape of the inner hole 115, and in this case, a portion of the extruded material 130 may remain uncompressed in the container 110. The stem 112 may be referred to as a ram or a compressor, and the scope of this embodiment is not limited by its terminology and shape.

The container 110 may have an extrusion hole 116 that defines an extruded shape of the extruded material 130. At this time, the extrusion holes 116 may be formed of a plurality of ports separated from each other. The shape of the extrusion holes 116 made of a plurality of ports can be very various. For example, the extrusion hole 116 of FIG. 2 includes two ports 116a and 116b. In addition, the extrusion hole 116 may be formed of various numbers of ports such as three, four, six, have.

The shape of the extrusion hole 116 may have a shape having a curved surface forming a part of the pipe as shown in Fig.

 And the extruded material 130 is discharged into a plurality of metal pieces through the extrusion holes 116 formed by the plurality of ports. For example, FIG. 2 shows two metal pieces being ejected, and various numbers of metal pieces may be ejected according to the number of the ports.

The calibration mold 123 includes a metal pipe discharge path for correcting the extruded material 130 to be extruded through the extrusion hole 116 into the shape of the metal pipe 140 and discharging the metal pipe 140 to the outside to be.

The calibration mold 123 may be provided with a friction stir joining device for joining the metal pieces 132 discharged through the extrusion holes 116. Specifically, the friction stir joining apparatus includes rotary members 118a and 118b capable of being brought into contact with each other in a region where a plurality of metal pieces 132 are in contact with each other, and a drive unit 120 ). At this time, stirring tips (119a, 119b) are formed on one surface of the rotating members (118a, 118b) in contact with the metal piece (132).

The friction stir joining is a method of joining the joining base materials without melting them, and Fig. 4 shows the principle of the friction stir joining. Referring to FIG. 4, a rotary member 420 having a light-weighted material is provided along the joint surface 410 formed by cutting apart the joint base materials 400a 400b, as compared with the joint base materials 400a and 400b. At this time, a stirring tip 422 is formed at the end of the rotating member 420. The stirring tip 422 may have a round rod shape and is inserted into the joint surface 410. After the stirring tip 422 is inserted into the joint surface 420, the rotary member 420 is moved along the joint surface 410 while rotating at a high speed. At this time, when the stirring tip 422 connected to the rotary member 420 rotates to generate frictional heat, the periphery of the joint surface 410 is softened so that the fusing flow of the bonding base material by stirring of the stirring tip 422 melts The joint base material is forcibly mixed. By this mixing, the joint portions 430 between the joint base materials 400a and 400b are formed and the joints are formed along the joint surface 410. [

Such friction stir welding is a solid-state welding in which welding is performed in a state in which no melting occurs, and the welding portion has little deformation due to the welding. Further, since defects such as pores and cracks, which are likely to occur in melting welding, hardly occur, the mechanical strength of the joint portion is excellent.

Fig. 3 shows the process of joining the metal pieces by this friction stir joining. Referring to FIGS. 1 and 3, the two metal pieces discharged through the extrusion holes are in parallel with each other in the extrusion direction (+ x direction) and abut against each other to form the joint surface 133. Rotary members 118a and 118b movable in the vertical direction are disposed on the upper and lower sides of the joint surface, respectively. The rotary members 118a and 118a vertically move to contact the joint surfaces. The contacted rotary members 118a and 118b receive the driving force by the driving device 120 and rotate to couple the two metal pieces to each other by friction stir welding.

At this time, since the stem 112 in the container 110 continuously compresses the extruded material 130 to discharge the metal piece through the extrusion hole 116, the metal piece is relatively extruded relative to the rotating members 118a and 118b Direction (+ x direction).

By this movement, the joint surface continues to be joined along the extrusion direction (+ x direction), and the metal pipe thus joined continuously enters the calibration mold 123. The calibration mold 123 is a mold for stably discharging the metal pipe joined by the rotating members 118a and 118b to the outside.

At this time, the calibration mold 123 is connected to the cylindrical hollow space formed inside along the extrusion direction (+ x) direction and the central portion of one side of the container 110, And a space formed between the rods extending to the inside of the hollow space. The metal pieces 132a and 132b discharged through the extrusion holes 116 by the extrusion are friction stir welded by the rotating members 118a and 118b and then are discharged to the outside through the metal pipe discharge path of the calibration mold 123 .

A joint trace and a burr generated in the friction stir welding process may be generated on the circumferential surface of the metal pipe immediately after the friction stir welding process. However, according to the embodiment of the present invention, through the metal pipe discharge path formed in the calibration mold 123 It is possible to prevent the occurrence of joint marks and burrs. Also, during the process of passing through the calibration mold 123, the metal pipe can be reduced in diameter by a small amount, for example, about 5% or so.

1 and 3, the stirring tips 119a and 119b are installed in a direction parallel to the moving direction F of the stem 112, 123).

Therefore, the rotation shaft of the stirring tip 119a (119b) is installed in a direction parallel to the moving direction F of the stem 112, so that the load caused by the extruded material 130 is uniformly dispersed on the rotating shaft, And the durability and the operability are improved, and the stirring tip is installed in the calibration mold, so that the assembling and management of the parts can be facilitated.

Referring to FIGS. 1 and 3, some embodiments of the present invention may be provided with a driving device 120 that distributes and transmits rotational driving force to the plurality of rotating members 118a and 118b.

The driving device 120 includes a distributed power transmission device 120 (a first power source device) that distributes the rotational driving force of the single driving source 120-2 and the single driving source 120-2 to the plurality of rotating members 118a and 118b, -1). Here, although the single drive source 120-2 is a motor, various drive sources such as a cylinder or a linear motor operated by a working fluid may be used.

1 and 3, the distributed power transmission device 120-1 is rotatably installed inside the calibration mold 123, and the inner diameter surface of the power transmission device 120-1 is connected to the rotary members 118a, 118b, And a ring gear 120-14 engaged with the rotating member side gear 120-15 to be connected and having an outer diameter surface connected to the driving source 120-2. The ring gear 120-14 can be meshed with a drive-side spur gear 120-13 having an outer diameter connected to the drive source 120-2, and the distributed power transmission device 120- 1, various types of spur gears, bevel gears, worm gears, and the like may be installed between the driving source side spur gear 120-13 and the driving source 120-2.

As shown in FIG. 3, when the single drive source 120-2 rotates the driving source side spur gear 120-13, the driving source 120-2 is driven by the driving source 120-2, The side spur gears 120-13 rotate the ring gears 120-14 and the ring gears 120-14 simultaneously rotate the two rotatable member side gears 120-15 which are in meshing engagement with each other . Therefore, the metal pieces can be friction stir welded while the rotary members 118a and 118b are rotated together with the rotation of the rotary member side gear 120-15.

3, the rotating members 118a and 118b may be equally disposed at an angle of 180 degrees toward the extruded member 130 on the inner surface of the ring gear 120-14. In addition, , The rotating members 118a, 118b and 118c are equally spaced at an angle of 120 degrees toward the extruded member 130 on the inner surface of the ring gear 120-14, , The rotating members 118a, 118b, 118c and 118d may be equally spaced by 90 degrees toward the extruded member 130 on the inner surface of the ring gear 120-14, The members can be installed in various numbers.

7 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus 200 according to some embodiments of the present invention. 7, the ring gear 120-14 includes a driven pulley 120-18 connected to the driving source 120-2 and a driven pulley 120-17 connected to the outer surface of the ring gear 120-14 by a belt 120-17. -19) can be installed.

As shown in FIG. 7, when the single drive source 120-2 rotates the drive pulley 120-18, the belt 120 (see FIG. 7) -17), the driven pulley 120-19 is rotated and the ring gear 120-14 is rotated. Then, the ring gear 120-14 simultaneously rotates the two rotary member side gears 120-15 meshing with each other. Therefore, the metal pieces can be friction stir welded to each other while the rotary members 118a and 118b are rotated together with the rotation of the rotary member side gear 120-15.

8 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus 300 according to some embodiments of the present invention. 8, the ring gear 120-14 includes a driving sprocket wheel 120-21 connected to the driving source 120-2 and a driven sprocket wheel 120-22 connected to the driving source 120-2 via a chain 120-20. (120-22) may be installed.

As shown in FIG. 8, when the single drive source 120-2 rotates the drive sprocket wheel 120-21, the chain drive unit 120-2 drives the chain 120-20 is rotated by the driven sprocket wheel 120-22 to rotate the ring gear 120-14. Then, the ring gear 120-14 simultaneously rotates the two rotary member side gears 120-15 meshing with each other. Therefore, the metal pieces can be friction stir welded to each other while the rotary members 118a and 118b are rotated together with the rotation of the rotary member side gear 120-15.

9 is a perspective view schematically illustrating a seamless pipe manufacturing apparatus 400 according to some embodiments of the present invention. Referring to FIG. 9, the ring gear 120-14 may have a worm wheel 120-24 engaged with a worm gear 120-25 connected to the driving source 120-2 on an outer diameter surface thereof.

As shown in FIG. 8, when the single drive source 120-2 rotates the worm gear 120-25, the worm gear 120-2 is rotated by the worm gear 120-2, The ring gear 120-24 is rotated to rotate the ring gear 120-14. Then, the ring gear 120-14 simultaneously rotates the two rotary member side gears 120-15 meshing with each other. Therefore, the metal pieces can be friction stir welded to each other while the rotary members 118a and 118b are rotated together with the rotation of the rotary member side gear 120-15.

On the other hand, as a modification of the above-described embodiments, the ring gear 120-14 may be rotated by being directly connected to the single drive source 120-2, omitting intermediate connection means such as pulleys, chains, and bevel gears.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: a seamless pipe manufacturing apparatus 110: a container
112: stem 140: metal pipe
116: extrusion holes 118a, 118b, 118c, 118d:
119a, 119b: stirring tip 120: driving device
123: calibration mold 130: extruded material
120-1: Distributed power transmission device 120-2: Single drive source
120-13: Spur gear on the driving side 120-14: Ring gear
120-15: Gear member for rotary member

Claims (10)

A container accommodating the extruded material therein and having an extrusion hole formed of a plurality of ports;
A stem for pressing the extruded material so that the extruded material is extruded through the extrusion hole;
A calibration mold including a metal pipe discharge path for calibrating the extruded material extruded through the extrusion hole into a shape of a metal pipe and discharging the metal pipe to the outside;
And a stirring tip provided on the calibration mold and inserted into a joint surface in which a plurality of metal pieces to be discharged through the extrusion hole are butted against each other, wherein the stirring tip is rotated in contact with the joint surface, A plurality of rotary members for performing the rotation of the rotary member; And
A driving device for distributing and transmitting rotational driving force to the plurality of rotating members;
Wherein the apparatus comprises: The method according to claim 1,
Wherein the stirring tip is installed in a direction parallel to the advancing direction of the stem and the rotary shaft is provided on the front surface of the calibrating die. The method according to claim 1,
The driving device includes:
Single drive source; And
A distributed power transmission apparatus for distributing and transmitting the rotation driving force of the single drive source to a plurality of rotating members;
Wherein the apparatus comprises: The method of claim 3,
Wherein the single drive source is a motor. The method of claim 3,
The distributed power transmission device includes:
And a ring gear which is rotatably installed inside the calibrating mold and meshed with a rotating member side gear whose inner diameter surface is connected to the rotating member and whose outer diameter surface is connected to the driving source. Device. 6. The method of claim 5,
Wherein the ring gear is engaged with a driving-source-side spur gear whose outer diameter surface is connected to the driving source. 6. The method of claim 5,
Wherein the ring gear is provided with a driven pulley connected to a driving pulley connected to the driving source and a driven pulley on an outer diameter surface thereof. 6. The method of claim 5,
Wherein the ring gear is provided with a driven sprocket wheel connected to a drive sprocket wheel connected to the drive source on a radially outer surface thereof by a chain. 6. The method of claim 5,
Wherein the ring gear is meshed with a drive source side worm gear connected to the drive source. 6. The method of claim 5,
Wherein a plurality of said rotary members are arranged on an inner diameter surface of said ring gear in a conformal manner.

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