KR20210120524A - A system for manufacturing pipe - Google Patents

Abstract

The present invention relates to a system for manufacturing a pipe, which comprises: a molding step of molding a pipe including a joint portion; a first data generating step of generating first data for roundness or straightness of the pipe including the joint portion; a welding step of performing welding on the joint portion of the pipe including the joint portion to produce a welded pipe; a second data generating step of generating second data for roundness or straightness of the welded pipe; a determining step of comparing the first data with the second data to determine whether the difference between the first data and the second data is within the acceptable error range; and a correcting step of correcting the welded pipe when the difference between the first data and the second data exceeds the error range. In accordance with the present invention, the correcting step is executed only in an area where the correcting step should be executed, thereby saving processing time spent on the correcting step to reduce manufacturing costs for the pipe.

Description

A SYSTEM FOR MANUFACTURING PIPE

The present invention relates to a pipe manufacturing system, and more particularly, to a pipe manufacturing system capable of reducing the processing time required for the calibration step.

In general, a pipe may be manufactured by forming a pipe in such a way that both edges of a plate-shaped material contact each other, and welding the portions in which both edges abut.

A general method of manufacturing a pipe is, first, a forming step of rolling a plate-shaped material in a round shape to form a pipe shape including a joint portion, and then a welding step of manufacturing a welded pipe by performing a welding process on the joint portion , Next, the pipe may be manufactured by performing a calibration step of correcting the cross section of the welded pipe to form a perfect circle, or correcting the welded pipe to form a straight line.

In this case, the step of forming the pipe including the joint portion may be performed through a forming roller, and the step of correcting the welded pipe may be performed through a straightening roller.

1 is a real photograph illustrating a process of forming a plate-shaped material, and FIG. 2 is a real photograph illustrating a pipe including a joint.

Referring to FIGS. 1 and 2 , as described above, the plate-shaped material can be rolled round through a forming roller to form a pipe, and in this case, the molded pipe 100 has a joint 110 . contains

In addition, as described above, by performing a welding process on the joint, it is possible to manufacture a welded pipe.

At this time, in the case of the welded pipe, it essentially includes a calibration step of a roundness calibration step of correcting the cross section of the welded pipe to form a perfect circle and a straightness calibration step of calibrating the welded pipe to form a straight line, which is This is because, in the welding step, in the process of welding the pipe including the joint portion, the pipe is contracted or expanded, so that the outer shape of the pipe is deformed.

That is, as in the above-mentioned FIG. 2, in the case of a pipe including a joint manufactured through the forming step, roundness and straightness are satisfied, but since the outer shape of the pipe is deformed by the welding step proceeding later, The correction step is necessarily performed.

On the other hand, in general, this calibration step is performed for the entire welded pipe.

Therefore, not only does the process time required for the calibration step become longer, but as the calibration proceeds even in the pipe region maintaining roundness or straightness, an error occurs in the maintained roundness and straightness. Also, there is a problem in that the manufacturing cost of the pipe increases due to this.

Korean Patent Laid-Open Patent No. 10-2012-0117535

An object of the present invention is to provide a pipe manufacturing system capable of reducing the manufacturing cost of the pipe by shortening the process time required for the calibration step.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the problems pointed out above, the present invention comprises: a forming step of forming a pipe including a joint; generating first data on the roundness or straightness of the pipe including the joint; a welding step of manufacturing a welded pipe by performing a welding process on the joint part of the pipe including the joint part; generating second data on the roundness or straightness of the welded pipe; comparing the first data and the second data to determine whether a difference value between the first data and the second data is within an error range; and a correction step of correcting the welded pipe when the difference value between the first data and the second data exceeds an error range.

In addition, the present invention provides a pipe manufacturing system, characterized in that when the difference between the first data and the second data is within an error range, the welded pipe is terminated without correcting it.

In addition, in the present invention, the forming step is performed through a forming roller unit, the forming roller unit includes a first forming roller unit, and the first forming roller unit includes: a 1-1 forming roller; And it provides a system for manufacturing a pipe including a first-second forming roller disposed to face the first-first forming roller.

In addition, in the present invention, in the welding step, the welding process is performed in a state in which the pipe including the joint is supported by a supporting roller unit, and the supporting roller unit includes a first supporting roller; and a second support roller disposed to face the first support roller.

Further, in the present invention, in a state in which the first support roller and the second support roller support the pipe including the joint portion, the first support roller and the second support roller support the pipe including the joint portion It provides a system for manufacturing a pipe, characterized in that the welding process is performed in the area being used.

In addition, the present invention provides a pipe manufacturing system, characterized in that the support roller portion is the same as the forming roller portion.

In addition, in the present invention, the straightening step proceeds through the straightening roller unit, the straightening roller unit includes a first straightening roller unit, the first straightening roller unit, the 1-1 straightening roller; and a first-second straightening roller disposed to face the first-first straightening roller.

In addition, the present invention provides a pipe manufacturing system, characterized in that the straightening roller portion is the same as the forming roller portion.

According to the present invention as described above, by performing the calibration step only in the area where the calibration step should be performed, the process time required for the calibration step can be shortened, thereby providing a pipe manufacturing system capable of lowering the manufacturing cost of the pipe. .

1 is a real photograph showing a process of forming a plate-shaped material.
2 is a real photograph showing a pipe including a joint.
3 is a flowchart for explaining a system for manufacturing a pipe according to the present invention.
4 and 5 are schematic views showing a forming roller unit according to the present invention.
Fig. 6 is a schematic view showing a first application example of the forming roller unit according to the present invention, and Fig. 7 is a schematic view showing a second application example of the forming roller unit according to the present invention.
8 is a diagram showing an example of a general roundness measuring device.
9 is a schematic view for explaining a welding step according to the present invention.
10 and 11 are schematic views showing a straightening roller unit according to the present invention.
12 is a schematic view showing a first application example of the straightening roller unit according to the present invention, and FIG. 13 is a schematic view showing a second application example of the straightening roller unit according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

Detailed contents for carrying out the present invention will be described in detail with reference to the accompanying drawings below. Regardless of the drawings, like reference numbers refer to like elements, and "and/or" includes each and every combination of one or more of the recited items.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It can be used to easily describe the correlation between a component and other components. A spatially relative term should be understood as a term that includes different directions of components during use or operation in addition to the directions shown in the drawings. For example, when a component shown in the drawings is turned over, a component described as “beneath” or “beneath” of another component may be placed “above” of the other component. can Accordingly, the exemplary term “below” may include both directions below and above. Components may also be oriented in other orientations, and thus spatially relative terms may be interpreted according to orientation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart for explaining a system for manufacturing a pipe according to the present invention.

Referring to FIG. 3 , the system for manufacturing a pipe according to the present invention includes a forming step of bending a plate-shaped material to form a pipe including a joint (S110).

More specifically, the forming step may include: an edge bending step of bending an edge of the plate-shaped material; and a main bending step of forming a pipe including a joint by pressing the edge-bent material.

In this case, the main bending step of the forming step may be performed through the forming roller unit.

4 and 5 are schematic views showing a forming roller unit according to the present invention.

Referring to FIG. 4 , the forming roller unit according to the present invention may include a first forming roller unit 200 , and the first forming roller unit 200 includes: a 1-1 forming roller 210 ; and a first-second forming roller 220 disposed to face the first-first forming roller 210 .

More specifically, as shown in FIG. 4 , the 1-1 forming roller 210 and the 1-2 forming roller 220 start in a state in which they are spaced apart from each other by a predetermined interval, and are shown in FIG. As shown, the forming process is performed while the 1-1 forming roller 210 and the 1-2 forming roller 220 move close to each other, and at this time, the 1-1 forming roller 210 and The 1-2 forming roller 220 may bend the plate-shaped material while rotating through respective rotation axes.

For this purpose, that is, in order to bend a plate-shaped material into a pipe shape having a circular cross section, the axial cross-sections of the 1-1 forming roller 210 and the 1-2 forming roller 220 are curved. It is preferable to be configured in the form.

As such, forming a plate-shaped material into a pipe by the forming roller unit corresponds to a matter obvious in the art, and thus a detailed description thereof will be omitted.

6 is a schematic view showing a first application example of the forming roller unit according to the present invention, and FIG. 7 is a schematic view showing a second application example of the forming roller unit according to the present invention.

Referring to FIG. 6 , the forming roller unit of the first application example according to the present invention includes a first forming roller unit 200 ; and a second forming roller unit 300 disposed to be spaced apart from the first forming roller unit 200 by a predetermined interval.

That is, in the above-described FIGS. 4 and 5 , the number of forming roller units is shown as one, but for easier forming, it is preferable that the forming roller units are plural.

More specifically, the first forming roller unit 200 includes a 1-1 forming roller 210; and a first-second forming roller 220 disposed to face the first-first forming roller 210 .

That is, as described above, the 1-1 forming roller 210 and the 1-2 forming roller 220 start in a state in which they are spaced apart from each other by a predetermined interval, and the 1-1 forming roller 210 . and the 1-2 forming roller 220 moves close to each other to perform a forming process, and at this time, the 1-1 forming roller 210 and the 1-2 forming roller 220 are each The pipe 100 including the joint 110 may be formed by bending the plate-shaped material while rotating through the rotating shaft.

In addition, the second forming roller unit 300 includes a 2-1 forming roller 310; and a second-second shaping roller 320 disposed to face the second-first shaping roller 310 .

That is, in the same manner as in the above-described first forming roller part, the 2-1 forming roller 310 and the 2-2 forming roller 320 start in a state in which they are spaced apart from each other by a predetermined interval, and the second- The forming process is performed while the first forming roller 310 and the second forming roller 320 move close to each other, and in this case, the 2-1 forming roller 310 and the 2-2 forming roller 320 may bend the plate-shaped material while rotating through each of the rotation shafts to form the pipe 100 including the joint 110 .

At this time, the first forming roller unit 200 may be understood to primarily bend the plate shape, and the second forming roller unit 300 may be understood to secondarily bend the firstly bent material. , thus, the pipe 100 including the joint 110 may be finally formed through the second forming roller 300 .

In addition, as described above, in the case of the pipe 100 including the joint 110 manufactured through the forming roller part, the roundness and straightness that the user wants to achieve may be satisfied.

Next, referring to FIG. 7 , the forming roller unit of the second application example according to the present invention includes a first forming roller unit 200 ; and a second forming roller unit 300 ′ spaced apart from the first forming roller unit 200 by a predetermined interval.

More specifically, the first forming roller unit 200 includes a 1-1 forming roller 210; and a first-second forming roller 220 disposed to face the first-first forming roller 210 .

In addition, the second forming roller unit 300' includes a 2-1 forming roller 310'; and a second-second forming roller 320' disposed to face the second-first forming roller 310'.

At this time, in the first application example in FIG. 6 , the rotation shafts of the forming rollers of the first forming roller unit 200 and the second forming roller unit 300 are located in the same direction, but in FIG. In the second application example, the rotation axis of each shaping roller of the first shaping roller part 200 and the second shaping roller part 300 ′ may be positioned in a vertical direction.

That is, in the present invention, when a plurality of forming roller units are configured, as in FIG. 6 , the rotation shafts of the plurality of forming roller units can be arranged in the same direction. The rotation axis can be arranged in different directions.

Continuingly, referring to FIG. 3 , the system for manufacturing a pipe according to the present invention includes generating first data on the roundness and straightness of the pipe including the joint ( S120 ).

As described above, in the case of the pipe 100 including the joint 110 manufactured through the forming roller part, the roundness and straightness that the user wants to achieve may be satisfied.

At this time, in the present invention, by generating first data on roundness and straightness according to certain reference points of the pipe including the joint, first data on the roundness and straightness of the pipe including the joint is generated. do.

Therefore, in the present invention, for example, the 1-1 data on the roundness and straightness at the first reference point of the pipe including the joint is secured, and also at the second reference point of the pipe including the joint. It is possible to secure the first 1-2 data on the roundness and straightness of

8 is a diagram showing an example of a general roundness measuring device.

On the other hand, the general roundness measuring device of FIG. 8 is disclosed in Korean Patent Application Laid-Open No. 10-2013-0068412, which corresponds only to an example of the roundness measuring device, and does not limit the type of the roundness measuring device in the present invention.

In addition, although only the roundness measuring device is shown in FIG. 8, in the present invention, the straightness of the pipe including the joint can be measured through a general straightness measuring device, which is, for example, in Korean Patent Application Laid-Open No. 10-2008. See -0062111.

Therefore, in the present invention, the roundness and straightness of the pipe including the joint according to the present invention can be measured through various roundness and straightness measuring devices, and in the present invention, the roundness measuring device and the straightness measuring device It does not limit the type of

Referring to FIG. 8 , a general roundness measuring device 1 includes a bottom plate 5 and a base plate 10 rotatably provided on the bottom plate 5 .

The base plate 10 has a substantially circular plate shape, and although not shown, is rotated horizontally about a vertical axis by a driving motor installed in any one of the lower portion serving as the rotation center, that is, the upper portion of the bottom plate 5 . It can be provided as much as possible.

In addition, the general roundness measuring apparatus 1 includes an object seating part 20 on which the measurement object is seated at the outer peripheral end of the base plate 10 .

That is, a pipe (hereinafter, referred to as a “pipe”) including the joint may be seated on the object receiving part 20 to measure the roundness.

On the other hand, the general roundness measuring device 1 is disposed on the bottom plate 5, and approaches or spaced apart from the outer circumferential surface of the pipe seated on the object receiving part 20. Rotation of the base plate 10 and a measuring unit 30 for measuring the roundness of the pipe while it is stationary.

The measuring unit 30 includes a probe 33 that is in contact with the outer circumferential surface of the pipe to electronically measure the outer diameter of the pipe, and a cylinder 31 that approaches or separates the probe 33 from the outer circumferential surface of the pipe. include

Such a measuring unit 30, one is arranged on one side at the theoretical concentric (central point), and the other is arranged on the opposite side to be 180° based on the concentricity, so that a pair of probes 33 is At the same time, it may be provided to measure the outer diameter at the moment of contact with the outer circumferential surface of the pipe.

In addition, a plurality of measurement units 30 as described above are disposed to be spaced apart from the bottom plate 5 .

In more detail, the measuring unit 30 is, based on the concentricity, four are each arranged to be spaced apart at intervals of 90 °, and a pair arranged at a position of 180 ° to each other is also to measure the outer diameter at two places of the pipe at the same time. possible.

In addition, in the general roundness measuring device 1, when the roundness of the pipe is measured, the base plate 10 is rotated to measure the roundness at a plurality of positions by the measuring unit 30, and then at a specific position (position to be measured). It is provided so that the rotation is stopped.

It is preferable that the measurement point of the pipe is measured at several tens to hundreds of points along the circumference. Therefore, the base plate 10 also rotates and stops by an angle corresponding to the measurement point of the pipe, and the rotation and stop is provided to repeat corresponding to a predetermined angle.

On the other hand, the general roundness measuring device 1 is disposed on the upper portion of the base plate 10, and is in close contact with the inner circumferential surface of the pipe seated on the object seating part 20 to fix the pipe with an inner diameter chucking part 25. may further include.

The inner diameter chucking part 25 is to be in close contact with the inner circumferential surface of the pipe, and is preferably disposed at least on the upper portion of the base plate 10 corresponding to the inner side of the pipe seating part 20 .

A plurality of the inner diameter chucking parts 25 may be disposed on the upper portion of the base plate 10 to firmly fix the rotating pipe for accurate roundness measurement.

In addition, although not shown in the drawings, the inner diameter chucking part is moved toward the inner circumferential surface of the seal by a pair of fixing parts spaced apart from the upper side of the base plate 10 and guided by the pair of fixing parts It may be provided with a moving part that is fixed to the fixed part when in contact with the inner circumferential surface of the pipe.

Meanwhile, the general roundness measuring apparatus 1 may further include the base plate 10 and a control unit 40 for controlling the operation of the measuring unit 30 .

For example, the control unit 40 may control rotation and stop operations of the base plate 10 , and the control unit 40 may control rotation and stop operations of the base plate 10 and It is possible to control the operation of the probe 33 and the cylinder 31 of the measuring unit 30 in conjunction with each other.

In addition, the control unit 40 has a function of not only controlling the operation of the base plate 10 and the measuring unit 30 described above, but also displaying the result value measured by the measuring unit 30 to the outside. can be done

For example, the maximum value (Max) and the minimum value (Min) of the pipe measured using the measurement unit 30 may be displayed, respectively, or a final result value obtained by subtracting the minimum value from the maximum value may be displayed. Also, it is possible to finally determine whether the roundness of the pipe, which is the measurement object, is defective or good, and display the determined result in a predetermined format.

However, as described above, in the present invention, the roundness and straightness of the pipe including the joint according to the present invention can be measured through various roundness and straightness measuring devices, and in the present invention, the roundness measuring device and The type of the straightness measuring device is not limited.

Meanwhile, in the above, it has been described that the first data is data on roundness and straightness, but in the present invention, the first data may be data on roundness or straightness, which is the second data to be described later as well as roundness or straightness. It may be data on straightness, and the type of data is not limited in the present invention.

This can be commonly applied to data to be described later.

Continuingly, referring to FIG. 3, the pipe manufacturing system according to the present invention includes a welding step of manufacturing a welded pipe by performing a welding process on the joint part of the pipe including the joint part (S130). .

The welding process may be performed through a general welding method such as argon welding, and the type of the welding method is not limited in the present invention.

9 is a schematic view for explaining a welding step according to the present invention.

Referring to FIG. 9 , in the welding step according to the present invention, the joint 110 of the pipe 100 can be welded through a welding tag T, and the outer shape of the pipe is deformed by the welding process. In order to prevent as much as possible, it is preferable to proceed with the welding process while the pipe 100 is supported by the support roller 400,

That is, in the welding process, welding may be performed in a region supported by the support roller 400 , and through this, it is possible to maximally prevent deformation of the outer shape of the pipe by the welding process.

At this time, the support roller unit 400, the first support roller 410; and a second support roller 420 disposed to face the first support roller 410 .

More specifically, as shown in FIG. 9 , in a state in which the first support roller 410 and the second support roller 420 support the pipe 100 , the welding tig T is A welding process may be performed on an area in which the first support roller 410 and the second support roller 420 support the pipe 100 .

Meanwhile, in the drawings, for convenience of explanation, the support roller unit 400 has been described as a separate roller unit, but in the present invention, the support roller unit 400 may be the same as the forming roller unit.

That is, the forming roller unit according to the present invention can not only form a plate-shaped material into a pipe, but also perform the role of a support roller for supporting the pipe including the joint in the melting process.

To this end, in the present invention, it is preferable that the process of forming the plate-shaped material into a pipe proceeds through a forming roller unit.

That is, in general, forming a plate-shaped material into a pipe is possible by a press method, but in the present invention, the forming process is performed through the forming roller part, and, in the melting process, through the forming roller part, In order to perform the role of the support roller, in the present invention, it is preferable that the process of forming the plate-shaped material into a pipe proceeds through the forming roller unit.

Continuingly, referring to FIG. 3 , the pipe manufacturing system according to the present invention includes generating second data on the roundness and straightness of the welded pipe ( S140 ).

As described above, in the case of the welded pipe, in the process of welding the pipe including the joint portion, the pipe is contracted or expanded, and thus the outer shape of the pipe is deformed.

That is, in the case of a pipe including a joint manufactured through the forming step, roundness and straightness are satisfied, but the outer shape of the pipe is deformed by the welding step, and a region that does not satisfy roundness and straightness occurs. will do

Accordingly, in the present invention, second data on the roundness and straightness of the welded pipe are generated, for example, the 2-1 data on the roundness and straightness at the first reference point of the welded pipe. In addition, it is possible to secure the 2-2 data on the roundness and straightness at the second reference point of the welded pipe.

At this time, as described in FIG. 8, in the present invention, through various roundness and straightness measuring devices, the roundness and straightness of the welded pipe according to the present invention can be measured, and in the present invention, the roundness measuring device and the type of the straightness measuring device is not limited.

Since this is the same as described above, a detailed description thereof will be omitted, and it is obvious that the device for securing the second data may be the same as the device for securing the first data in the present invention.

Subsequently, referring to FIG. 3 , the pipe manufacturing system according to the present invention compares the first data with the second data to determine whether the difference between the first data and the second data is within an error range. and determining (S150).

In this case, the error range may be ±1 cm, which is a value set by the user, and does not limit the numerical value of the error range in the present invention.

As described above, in the case of a pipe including a joint manufactured through the forming step, roundness and straightness are satisfied, but the outer shape of the pipe is deformed by the welding step, and the roundness and straightness are not satisfied. areas that are not.

Therefore, in the present invention, based on the first data on the roundness and straightness of the pipe including the joint manufactured through the forming step, the roundness and straightness of the welded pipe are compared, and accordingly, the By generating second data on the roundness and straightness of the welded pipe, it is determined whether a difference value between the first data and the second data is within an error range.

At this time, as described above, in step S120, in the present invention, for example, the 1-1 data on the roundness and straightness at the first reference point of the pipe including the joint is secured, and the joint The first and second data on roundness and straightness at the second reference point of the pipe including the part can be obtained, and the first reference point of the pipe including the joint part and the first reference point of the welded pipe are at the same reference point. Also, the second reference point of the pipe including the joint and the second reference point of the welded pipe correspond to the same reference point.

Therefore, in the present invention, based on the same reference point, the difference between the first data on the roundness and straightness of the pipe including the joint part and the second data on the roundness and straightness of the welded pipe is compared. By doing so, it is possible to determine whether to proceed with the calibration step as described later.

More specifically, for example, the first-first data for roundness and straightness at the first reference point of the pipe including the joint and the second for roundness and straightness at the first reference point of the welded pipe If the difference value of -1 data is within the error range, the calibration step is not performed in the area of the first reference point and is ended.

However, for example, 1-2 data on roundness and straightness at the second reference point of the pipe including the joint and 2-2 data on roundness and straightness at the second reference point of the welded pipe When the difference value of the data is out of the error range, the calibration step is performed in the area of the first reference point.

That is, as shown in FIG. 3 , when the difference between the first data and the second data is within the error range, the calibration step is not performed and is ended. If the difference between the first data and the second data exceeds an error range, a calibration step of calibrating the welded pipe is included (S160).

In this case, the straightening step may be performed through a straightening roller unit.

10 and 11 are schematic views showing a straightening roller unit according to the present invention.

Referring to FIG. 10 , the straightening roller unit according to the present invention may include a first straightening roller part 500 , and the first straightening roller part 500 may include: a 1-1 straightening roller 510 ; and a 1-2 th straightening roller 520 disposed to face the 1-1 th straightening roller 510 .

More specifically, as shown in FIG. 10 , the 1-1 straightening roller 510 and the 1-2 th straightening roller 520 start in a state in which they are spaced apart from each other by a predetermined interval, and are shown in FIG. As shown, the 1-1 straightening roller 510 and the 1-2 th straightening roller 520 move close to each other to perform the straightening process, and at this time, the 1-1 straightening roller 510 and the 1-1 straightening roller 510 and The 1-2 straightening roller 520 may perform a straightening step of straightening the welded pipe while rotating through each rotation shaft.

For this, that is, in order to proceed with the straightening step of straightening the welded pipe, the axial cross-sections of the 1-1 straightening roller 510 and the 1-2 straightening roller 520 are configured in a curved shape. It is preferable to be

Since it is obvious in the art to straighten the pipe by the straightening roller unit, a detailed description will be omitted below.

12 is a schematic view showing a first application example of the straightening roller part according to the present invention, and FIG. 13 is a schematic diagram showing a second application example of the straightening roller part according to the present invention.

Referring to FIG. 12 , the straightening roller unit of the first application example according to the present invention includes a first straightening roller unit 500 ; and a second straightening roller part 600 disposed to be spaced apart from the first straightening roller part 500 by a predetermined interval.

That is, in FIGS. 10 and 11, the number of straightening roller parts is shown as one, but for easier correction, it is preferable that the straightening roller part is plural.

More specifically, the first straightening roller unit 500 includes a 1-1 straightening roller 510; and a 1-2 th straightening roller 520 disposed to face the 1-1 th straightening roller 510 .

That is, as described above, the 1-1 straightening roller 510 and the 1-2 th straightening roller 520 start in a state in which they are spaced apart from each other by a predetermined interval, and the 1-1 straightening roller 510 . and the first and second straightening rollers 520 move closer to each other to perform a straightening process, and at this time, the 1-1 straightening roller 510 and the 1-2 straightening roller 520 are each While rotating through the rotating shaft, a calibration step of correcting the welded pipe may be performed.

In addition, the second straightening roller unit 600 includes a 2-1 straightening roller 610; and a 2-2nd straightening roller 620 disposed to face the 2-1th straightening roller 610 .

That is, in the same manner as in the above-described first straightening roller part, the 2-1 th straightening roller 610 and the 2nd -2nd straightening roller 620 start in a state in which they are spaced apart from each other by a predetermined interval, and the second- The first straightening roller 610 and the second-2nd straightening roller 620 move close to each other to perform the straightening process, and at this time, the 2-1th straightening roller 610 and the 2-2nd straightening roller 620 may proceed with a calibration step of calibrating the welded pipe while rotating through each of the rotation shafts.

At this time, it can be understood that the first straightening roller unit 500 primarily straightens the welded pipe, and the second straightening roller part 600 secondary correction of the primary straightened pipe. Accordingly, it is possible to correct the finally welded pipe 120 through the second straightening roller unit 600 .

Next, referring to FIG. 13 , the straightening roller part of the second application example according to the present invention includes a first straightening roller part 500 ; and a second straightening roller part 600' which is spaced apart from the first straightening roller part 500 by a predetermined interval.

More specifically, the first straightening roller unit 500 includes a 1-1 straightening roller 510; and a 1-2 th straightening roller 520 disposed to face the 1-1 th straightening roller 510 .

In addition, the second straightening roller unit 600' includes a 2-1 straightening roller 610'; and a 2-2nd straightening roller 620' disposed to face the 2-1th straightening roller 610'.

At this time, in the first application example in FIG. 12 , the rotation shafts of the straightening rollers of the first straightening roller part 500 and the second straightening roller part 600 are located in the same direction, but in FIG. In the second application example, the rotation axis of each of the straightening rollers of the first straightening roller part 500 and the second straightening roller part 600' may be located in a vertical direction.

That is, in the present invention, when a plurality of straightening rollers are configured, as in FIG. 12, the rotational axes of the plurality of straightening rollers can be arranged in the same direction, and unlike in FIG. 13, as in FIG. 13, the plurality of straightening rollers The rotation axis can be arranged in different directions.

Meanwhile, in the drawings, for convenience of explanation, the straightening roller parts 500 and 600 have been described as separate roller parts, but in the present invention, the straightening roller parts 500 and 600 may be the same as the forming roller part. .

That is, the forming roller unit according to the present invention can not only form a plate-shaped material into a pipe, but also perform the role of a straightening roller unit for correcting the welded pipe in the straightening process.

To this end, in the present invention, it is preferable that the process of forming the plate-shaped material into a pipe proceeds through a forming roller unit.

That is, in general, forming a plate-shaped material into a pipe is also possible by a press method, but in the present invention, the forming process is performed through the forming roller unit, and in the straightening process, through the forming roller unit, In order to perform the role of the straightening roller, in the present invention, it is preferable that the process of forming the plate-shaped material into a pipe proceeds through the forming roller unit.

As described above, in the present invention, based on the same reference point, the difference value between the first data on the roundness and straightness of the pipe including the joint and the second data on the roundness and straightness of the welded pipe By comparing , it is possible to determine whether to proceed with the calibration step.

More specifically, for example, the first-first data for roundness and straightness at the first reference point of the pipe including the joint and the second for roundness and straightness at the first reference point of the welded pipe -1 If the difference value of the data is within the error range, the calibration step is not performed in the region of the first reference point, and on the contrary, for example, the second reference point of the pipe including the joint If the difference value between the 1-2 data on the roundness and straightness in , and the 2-2 data on the roundness and straightness at the second reference point of the welded pipe is out of the error range, the In this area, the correction phase is carried out.

That is, in the present invention, the problem of the prior art can be solved by determining an area in which the calibration step is to be performed and an area in which the calibration step is not performed, and performing the calibration step only in the area in which the calibration step is to be performed.

That is, the general calibration step proceeds with respect to the entire welded pipe, and accordingly, the process time required for the calibration step is lengthened, and thus the calibration proceeds even in the pipe region maintaining roundness or straightness. Accordingly, there is a problem in that an error occurs in the maintained roundness and straightness, and also, there is a problem in that the manufacturing cost of the pipe increases due to this.

However, in the present invention, it is possible to provide a pipe manufacturing system capable of reducing the manufacturing cost of the pipe by shortening the process time required for the calibration step by performing the calibration step only in the area where the calibration step should be performed.

Although embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (8)

A forming step of forming a pipe including a joint;
generating first data on the roundness or straightness of the pipe including the joint;
a welding step of manufacturing a welded pipe by performing a welding process on the joint part of the pipe including the joint part;
generating second data on the roundness or straightness of the welded pipe;
comparing the first data and the second data to determine whether a difference value between the first data and the second data is within an error range; and
and a calibration step of correcting the welded pipe when a difference value between the first data and the second data exceeds an error range. The method of claim 1,
If the difference between the first data and the second data is within an error range, the pipe manufacturing system is characterized in that the welded pipe is not corrected and the pipe manufacturing system is terminated. The method of claim 1,
The forming step proceeds through the forming roller unit,
The forming roller unit includes a first forming roller unit,
The first forming roller unit may include: a 1-1 forming roller; and a first-second forming roller disposed to face the first-first forming roller. 4. The method of claim 3,
In the welding step, a welding process is performed in a state in which the pipe including the joint is supported by a support roller part,
The support roller unit may include: a first support roller; and a second support roller disposed to face the first support roller. 5. The method of claim 4,
With respect to a region in which the first support roller and the second support roller support the pipe including the joint portion in a state where the first support roller and the second support roller support the pipe including the joint portion A system for manufacturing a pipe, characterized in that it proceeds with a welding process. 5. The method of claim 4,
The pipe manufacturing system, characterized in that the support roller part is the same as the forming roller part. 4. The method of claim 3,
The correction step is carried out through the correction roller unit,
The straightening roller part includes a first straightening roller part,
The first straightening roller unit may include: a 1-1 straightening roller; and a first-second straightening roller disposed to face the first-first straightening roller. 8. The method of claim 7,
The straightening roller part is the same as the forming roller part.

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