KR20210151327A - Billet for extrusion of multi-layer pipes and manufacturing method of multi-layer pipes using the same - Google Patents

Abstract

The present invention relates to a billet for extrusion of multilayer pipes and a manufacturing method of multilayer pipes using the same. The billet for extrusion of multilayer pipes according to the present invention comprises: a pipe consisting of many layers and having the inside formed to be hollow; and a billet part for filling the inside of the pipe and enveloping the outside thereof. The billet part includes: a billet rod for filling the inside of the pipe; a billet can for enveloping the outer rim of the pipe; a billet nose for closing one side of the billet can; and a billet lead for closing another side of the billet can. The manufacturing method of multilayer pipes using the billet for extrusion of multilayer pipes according to the present invention comprises: an assembly process for assembling, in a clean environment, the pipe consisting of many layers and having the inside formed to be hollow, and the billet part for filling the inside of the pipe and enveloping the outside thereof; a welding process for welding, in a vacuum environment, the billet assembled through the assembly process; and an extrusion process for manufacturing a multilayer pipe by extruding the billet welded through the welding process. According to the present invention, damage to multilayer pipes can be prevented while facilitating storage and transport thereof and enhancing bonding strength between materials during extrusion.

Description

Billet for extrusion of multi-layer pipes and manufacturing method of multi-layer pipes using same

The present invention relates to a billet for extruding a multi-layer pipe and a method for manufacturing a multi-layer pipe using the same, and more particularly, to a multi-layer pipe extrusion that is easy to store and transport, and the bonding force between materials during extrusion is increased while preventing damage to the multi-layer pipe It relates to a billet and a method for manufacturing a multilayer tube using the same.

In general, a multi-layer tube consists of different materials forming each layer, and is intended to highlight the characteristics of each material.

As such, the multi-layer tube has a disadvantage in that the bonding strength is not excellent as it is composed of different materials.

In this regard, Korean Patent No. 10-1203143 and Korean Patent No. 10-1281321 have developed and disclosed a multi-layer pipe manufacturing apparatus and manufacturing method for manufacturing a high-quality multi-layer pipe, and a multi-layer pipe and a manufacturing method thereof.

However, the multi-layer pipe manufacturing apparatus and manufacturing method according to the prior art, and the multi-layer pipe and the manufacturing method have a disadvantage in that the bonding reliability between different materials constituting each layer is inferior.

In addition, in additionally performing the extrusion process to supplement the bonding reliability between different materials, the diameter of the pipe or tube and the extruder do not match, so there was a disadvantage of a high defect rate during the extrusion process.

Korean Registered Patent No. 10-1203143 Korean Patent No. 10-1281321

Accordingly, an object of the present invention has been devised to solve the problems of the prior art as described above, and the billet for extrusion of a multi-layer tube is easy to store and transport, and the bonding force between materials during extrusion is increased while damage to the multi-layer tube is prevented. And to provide a method for manufacturing a multi-layer tube using the same.

According to a feature of the present invention for achieving the above object, it is made of a multi-layered tube and a hollow inside is formed, and a billet part is formed to fill the inside of the pipe and surround the outside, The billet portion includes a billet rod filling the inside of the tube, a billet can surrounding the outer ring of the tube, a billet nose closing one side of the billet can, and a billet lid closing the other side of the billet can is characterized by

The billet can, the billet nose, and the billet lead constituting the billet part are welded to each other in a vacuum environment.

A protrusion for guiding in the extrusion process is further formed on one surface of the billet nose, and a discharge groove is further formed on one surface of the billet nose and the billet lead to allow air inside the billet can to escape in a vacuum environment; The protrusion is characterized in that the protrusion is formed obliquely from the outer ring to the inner ring.

An assembly process of assembling a multi-layered tube with a hollow interior and a billet part formed to fill the interior of the tube and surround the exterior in a clean environment, and the billet assembled through the assembly process is welded in a vacuum environment It characterized in that it proceeds including the welding process, and the extrusion process of manufacturing a multi-layer tube by extruding the billet welded through the welding process.

The extrusion process includes a bonding step of improving bonding strength between different materials by cold compressing the billet welded through the welding process in an inert atmosphere, and a guide hole for the extrusion process inside the cold-compressed billet through the bonding step. A guide hole forming step of forming A primary removal step of removing the billet portion, a secondary removal step of additionally removing the billet portion remaining on the surface of the extruded tube while the billet portion is removed through the first removal step, and the billet portion removal through the secondary removal step It is characterized in that it proceeds including a washing drying step of washing and drying the old tube.

The billet for extrusion of a multi-layer pipe according to the present invention and a method for manufacturing a multi-layer pipe using the same have the following effects.

In the present invention, as the tube is assembled to be blocked from the outside by the billet part, there is an advantage in that oxidation and surface damage of the tube are prevented.

In the present invention, as the billet lead is provided, when the rear end is removed in the extrusion process, only the billet lead, not the material constituting the tube, is removed, so that it is economically excellent.

In the present invention, since the thickness of the billet can can be formed in various ways, there is an advantage that it can be applied to various extruders.

1 is an exploded perspective view showing the configuration of a preferred embodiment of a billet for extrusion of a multi-layer pipe according to the present invention and a method for manufacturing a multi-layer pipe using the same according to the present invention;
Figure 2 is a combined cross-sectional view showing the configuration of a preferred embodiment of the multi-layer pipe extrusion billet according to the present invention and a method for manufacturing a multi-layer pipe using the same
3 is a perspective view illustrating the billet for extruding a multi-layer tube according to the present invention and the billet having completed the guide hole forming step constituting a preferred embodiment of the method for manufacturing a multi-layer tube using the same;
4 is a perspective view showing a multi-layered tube manufactured through a preferred embodiment of a billet for multi-layered tube extrusion and a method for manufacturing a multi-layered tube using the same according to the present invention;
5 is a flow chart showing a manufacturing process constituting a preferred embodiment of a billet for extrusion of a multi-layer pipe according to the present invention and a method for manufacturing a multi-layer pipe using the same according to the present invention;

Hereinafter, a preferred embodiment of a billet for extrusion of a multi-layer pipe according to the present invention and a method for manufacturing a multi-layer pipe using the same will be described with reference to the drawings.

As shown in FIGS. 1 to 5, an embodiment of a billet for extrusion of a multi-layer tube according to the present invention and a method for manufacturing a multi-layer tube using the same are shown. That is, FIG. 1 is an exploded perspective view showing the configuration of a preferred embodiment of a multi-layer pipe extrusion billet according to the present invention and a method for manufacturing a multi-layer pipe using the same, and FIG. 2 is a multi-layer pipe extrusion billet according to the present invention and the same A combined cross-sectional view showing the configuration of a preferred embodiment of the method for manufacturing a multi-layer tube using the same is shown, and in FIG. 3, a billet for extruding a multi-layer tube according to the present invention and a guide hole constituting a preferred embodiment of a method for manufacturing a multi-layer tube using the same is formed. A perspective view showing the billet having completed the steps is shown, and FIG. 4 is a perspective view showing a pipe having a multi-layer structure manufactured through a preferred embodiment of the billet for extrusion of a multi-layer tube according to the present invention and a method for manufacturing a multi-layer tube using the same according to the present invention. 5 is a flowchart showing a manufacturing process constituting a preferred embodiment of the multi-layer pipe extrusion billet according to the present invention and a method for manufacturing a multi-layer pipe using the same according to the present invention.

As shown in these drawings, the billet for multi-layer pipe extrusion and the method for manufacturing a multi-layer pipe using the same according to the present invention include a pipe 100 made of multiple layers and having a hollow inside, and filling the inside of the pipe; In addition, the billet portion 200 is formed to surround the outside, and the billet portion includes a billet rod 210 filling the inside of the tube, a billet can 220 surrounding the outer ring of the tube, and the billet It is configured to include a billet nose 240 for closing one side of the can, and a billet lid 230 for closing the other side of the billet can.

The tube 100 means a tube material that is hollow inside and is formed long in the longitudinal direction.

Such, the tube 100 is made of a multi-layer.

In addition, the multi-layer tube 100 may be made of various materials such as zirconium (Zr), molybdenum (Mo), vanadium (V), Fe-Cr-Si alloy, Fe-Cr-Al alloy, respectively.

Different tubes 100 made of the above materials are formed to have different outer diameters and may be assembled through insertion, or overlay welding, low-temperature powder spraying, plasma deposition, It may have a multi-layer structure by laminating it through a method such as electron beam deposition or laser deposition.

As such, the tube 100 is assembled to be blocked from the outside by the billet portion 200 .

That is, the tube 100 is positioned inside the billet part 200 .

The billet rod 210 has a shape similar to a cylinder and is formed to be elongated back and forth, and is intended to fill the inside of the tube 100 .

The billet rod 210 is to prevent excessive deformation of the tube 100 having a hollow interior during the extrusion process of the tube 100, and preferably has an outer diameter corresponding to the inner diameter of the tube 100. .

The billet can 220 has a shape similar to a hollow cylinder with open top and bottom surfaces, and is formed to be elongated back and forth, and is intended to surround the outside of the tube 100 .

Such a billet can 220 is to protect the outer ring portion of the tube 100 during the extrusion process of the billet for extrusion of a multi-layer tube according to the present invention and to prevent a case where the outer diameter does not match with the tool held by the extrusion company. , the thickness of the billet can 220 may be formed in various ways.

In addition, it is preferable that the billet can 220 is formed to be longer than the tube 100 by a predetermined length. This is to block the tube 100 from the outside by assembling the billet lead 230 and the billet nose 240 and the billet can 220 .

That is, the billet for extrusion of a multilayer tube according to the present invention may be applied to various extrusion apparatuses.

The billet lid 230 is for closing the rear end (left side in FIG. 1) of the billet can 220, and is formed in a shape similar to a circular flat plate.

The billet lead 230 may preferably have an outer diameter corresponding to the inner diameter of the billet can 220 so that a part of the billet lead 230 can be inserted into the billet can 220 .

In addition, the billet lead 230 is preferably formed to satisfy a predetermined thickness as it is a rear end portion that is removed during the extrusion process.

The billet nose 240 is for closing the tip (right side in FIG. 1) of the billet can 220, and has a shape similar to a cone.

That is, it is similar to that the protrusion 241 is further formed on the billet lead 230 .

The protrusion 241 is formed to protrude obliquely from the outer ring to the inner ring, and serves as a guide in the extrusion process.

That is, a protrusion 241 for guiding in the extrusion process is further formed on one surface of the billet nose 240 .

The billet nose 240 may have an outer diameter corresponding to the inner diameter of the billet can 220 so that a part of the billet nose 240 can be inserted into the billet can 220 .

In addition, a discharge groove 242 is further formed on one surface of the billet nose 240 and the billet lead 230 to allow the air inside the billet can 220 to escape in a vacuum environment.

That is, when the billet rod 210, the billet can 220, the billet lead 230, the billet nose 240 and the tube 100 constituting the billet part 200 are integrally coupled to each other, the discharge groove 242 Accordingly, the internal air of the billet part 200 is able to escape.

As such, the billet part 200 and the tube 100 may be integrally assembled, wherein the billet can 220, the billet nose 240, and the billet lead 230 are welded to each other in a vacuum environment and , is combined through this.

In addition, the billet part 200 is made of a copper material as an example. This is in consideration of the economical efficiency and workability of copper, and copper is highly economical as it can be recycled when it is scrapped, and it satisfies the hardness and strength to protect the tube 100 with excellent workability. . Of course, it may be made of other materials that satisfy this.

As described above, in the billet for multi-layer pipe extrusion according to the present invention, as the pipe is assembled to be blocked from the outside by the billet part, oxidation and surface damage of the pipe are prevented.

On the other hand, as shown in these drawings, the method for manufacturing a multi-layer tube using a billet for extruding a multi-layer tube according to the present invention includes a tube 100 made of multi-layers and having a hollow inside, and the inside of the tube 100 . The assembling process (S10) of assembling the billet part 200 formed to cover the outside with filling in a clean environment (S10), the welding process (S20) of welding the billet assembled through the assembling process in a vacuum environment, and the welding It proceeds including the extrusion process (S30) of manufacturing the multi-layer pipe 100 by extruding the welded billet through the process (S30).

The assembling process (S10) is assembling the multi-layered pipe 100 and the billet 200 formed to fill the inside of the pipe 100 and surround the outside in a clean environment, and the pipe 100 ) and the billet 200 are assembled, it is preferable that foreign substances such as dust are prevented from entering the inside.

Here, the clean environment means an environment in which dust or the like cannot be introduced into the pipe 100 and the billet part 200 as they are assembled, and the present invention provides a 10,000 class grade based on the air clean room.

That is, the billet rod 210 , the billet can 220 , the billet lead 230 , the billet nose 240 and the tube 100 constituting the billet part 200 are assembled in a clean environment to prevent foreign substances from entering the inside. will do

The welding process (S20) is to weld the billet assembled through the assembling process (S10), and the billet nose 240, the billet lead 230, and the billet can 220 are welded.

Here, it is preferable that the billet nose 240, the billet lead 230, and the billet can 220 are welded in a vacuum environment, and the present invention suggests that welding is made through electron beam welding.

At this time, since the discharge groove 242 is formed in the billet nose 240 and the billet lead 230, the air inside the billet may be completely removed.

Through this welding process (S20), the pipe 100 and the billet part 200 are integrally formed.

Next, the billet welded through the welding process (S20) is manufactured through the extrusion process (S30) to the multi-layer pipe (100).

The extrusion process (S30) is to extrude the billet through an extruder, and a bonding step (S31) of improving the bonding force between different materials by cold-compressing the billet welded through the welding process (S20) in an inert atmosphere; The guide hole forming step (S32) of forming a guide hole 110 for the extrusion process in the inside of the cold-compressed billet through the combining step (S31), and the guide hole 110 through the guide hole forming step (S32) ), an extrusion step (S33) of applying a lubricant to the surface of the formed billet and performing an extrusion process, and a primary removal step of removing the billet part 200 of the extruded billet through the extrusion step (S33) ( S34) and a secondary removal step of additionally removing the billet portion 200 remaining on the surface of the extruded tube 100 as well as the billet portion 200 being removed through the first removing step (S34) (S35) ), and a washing and drying step (S36) of washing and drying the pipe 100 from which the billet part 200 is removed through the secondary removal step (S35).

The bonding step (S31) is to cold compress the billet welded through the welding process (S20) in an inert atmosphere. This is to increase the bonding force between different materials constituting the tube 100 .

This, through the bonding step (S31), the separation of the tube 100 made of different materials can be prevented.

The guide hole forming step (S32) is to form the guide hole 110 for the extrusion process in the cold-compressed billet through the bonding step (S31), and the guide hole 110 is formed to pass through the billet back and forth. .

That is, the guide hole 110 is formed to pass through the billet nose 240 and the billet lead 230 together with the billet rod 210 .

The guide hole forming step ( S32 ) is to expand the hole formed by center drilling on one surface of the billet nose 240 or the billet lead 230 by performing a punching press, through which the guide hole is formed. (110) is formed.

As such, the mandrel of the extruder may be inserted into the guide hole 110 .

In the extruding step (S33), the billet having the guide hole 110 formed through the guide hole forming step (S32) is extruded through an extruder, and a lubricant is applied to the surface of the billet before extrusion is performed.

Here, the lubricant suggests that graphite paint suitable for the billet part 200 is made of a copper material, but glass powder or the like may be used.

With this, a reaction furnace connected to the extruder is further provided, and the temperature of the billet can be raised through this reaction furnace.

At this time, the temperature of the reactor is raised to about 550 ° C. to 700 ° C. when most of the zirconium (Zr) material is used, but the melting point of other materials constituting the tube 100 and the copper material constituting the billet part 200 is comprehensively calculated. It is advisable to take this into consideration.

As such, in the process of raising the temperature of the billet by the reactor, oxidation of the tube 100 will be prevented by the billet part 200 .

In addition, the billet extruded through the extrusion step (S33) is further cooled immediately after extrusion, air cooling or water cooling may be used. In addition, since the final particle size of the material constituting the tube 100 may vary depending on the cooling method, it is preferable to perform cooling in consideration of this.

Here, when the natural cooling method is used, the final particle size of the material constituting the tube 100 increases, and accordingly, there is a risk that the performance of the material constituting the tube 100 is deteriorated, so it is preferable to cool it faster than natural cooling do.

The first removing step (S34) is to remove the billet portion 200 of the billet extruded through the extrusion step (S33). In the first removing step (S34), the billet portion 200 is removed in a mechanical manner. is made

That is, the removal of the billet lead 230 and the billet nose 240 through the cutting device, the removal of the billet can 220 through the grinding device, and the removal of the billet rod 210 through the drilling or honing device are made. will become

In removing the billet part 200 through the first removing step (S34), take special care so that the tube 100 is not damaged.

At this time, a portion of the copper material constituting the billet portion 200 will remain on the surface of the tube 100 as it is processed so as not to cause damage to the tube 100 through the primary removal step S34. .

Therefore, the secondary removal step (S35) for removing the copper material constituting the billet portion 200 remaining on the surface of the tube 100 is further performed.

The secondary removal step (S35) is to remove copper remaining on the surface of the tube 100 from which the billet part 200 has been removed through the primary removal step (S34), and is It melts copper.

Here, the acid is nitric acid as an example, and the concentration thereof is preferably 70% to 80%. That is, it is best to have a concentration from which only the copper component remaining on the surface of the billet part 200 can be removed.

In addition, the concentration of nitric acid may be set to have about 30% for safety reasons of workers. Of course, as the concentration is lowered, the immersion time in nitric acid is longer, but the safety accident prevention effect is maximized.

In the washing and drying step (S36), acid and copper components are removed by washing the tube 100 from which the billet part 200 has been completely removed through the secondary removal step (S35) with water, and this By drying again, oxidation and corrosion of the tube 100 can be minimized.

When the washing and drying step (S36) is completed, the bonding force between different materials constituting the tube 100 having a multilayer structure is increased, and surface defects and breakage due to the extrusion process will be minimized.

That is, the billet for extruding a multi-layer tube according to the present invention and a method for manufacturing a multi-layer tube using the same, as the tube 100 is assembled to be blocked from the outside by the billet part 200, oxidation of the tube 100 is prevented during storage and damage to the tube 100 during movement is prevented.

In addition, according to the present invention, the billet for extrusion of a multi-layer tube and a method for manufacturing a multi-layer tube using the same are configured so that the billet lead 230 can be removed when the rear end is removed in the extrusion process as the billet lead 230 is provided. The loss of expensive material constituting (100) is to be prevented.

In addition, the billet for extruding a multilayer tube and a method for manufacturing a multilayer tube using the same according to the present invention can be applied to various extruders by varying the thickness of the billet can 220 surrounding the surface of the tube 100 .

The scope of the present invention is not limited to the embodiments illustrated above, and many other modifications based on the present invention will be possible for those skilled in the art within the technical scope as described above.

100. tube 110. guide hole
200. Billet 210. Billet Rod
220. Billet Can 230. Billet Lead
240. Billet nose 241. Overhang
242. Discharge groove S10. assembly process
S20. Welding process S30. extrusion process
S31. bonding step S32. Guide hole formation step
S33. Extrusion step S34. 1st Removal Step
S35. Secondary removal step S36. washing drying step

Claims (5)

It consists of a multi-layered tube, the inside of which is hollow;
a billet portion formed to fill the inside of the tube and surround the outside;
is made, including
The billet part,
a billet rod filling the interior of the tube;
a billet can surrounding the outer ring of the tube;
a billet nose closing one side of the billet can;
A billet for extruding a multi-layer pipe, characterized in that it comprises; a billet lid for closing the other side of the billet can. The method of claim 1,
A billet for multi-layer pipe extrusion, characterized in that the billet can, the billet nose, and the billet lead forming the billet part are welded to each other in a vacuum environment. The method of claim 1,
A protrusion for guiding in the extrusion process is further formed on one surface of the billet nose,
A discharge groove is further formed on one surface of the billet nose and the billet lead to allow the air inside the billet can to escape in a vacuum environment,
The protrusion billet for extrusion of a multi-layer pipe, characterized in that the projection is formed to protrude from the outer ring to the inner ring. An assembly process of assembling a multi-layered tube with a hollow interior and a billet portion formed to fill the interior of the tube and surround the exterior in a clean environment;
a welding process of welding the billets assembled through the assembling process in a vacuum environment;
An extrusion process of manufacturing a multi-layer pipe by extruding the welded billet through the welding process; 5. The method of claim 4,
The extrusion process is
a bonding step of improving bonding strength between different materials by cold compressing the billet welded through the welding process in an inert atmosphere;
A guide hole forming step of forming a guide hole for the extrusion process in the inside of the cold-pressed billet through the bonding step;
an extrusion step of applying a lubricant to the surface of the billet on which the guide hole is formed through the guide hole forming step and performing an extrusion process;
a primary removal step of removing the billet portion of the billet extruded through the extrusion step;
a secondary removal step of additionally removing the billet portion remaining on the surface of the extruded tube while the billet portion is removed through the first removal step;
A method of manufacturing a multi-layer tube using a billet for extrusion of a multi-layer tube, characterized in that it proceeds including; a washing and drying step of washing and drying the tube from which the billet part has been removed through the secondary removal step.

Images