KR20200016056A - Pipe forming device and manufacturing method of distribution pipe using this device - Google Patents

Abstract

The present invention relates to a pipe forming apparatus and a method for manufacturing a distribution pipe using the same. According to the present invention, the pipe forming apparatus comprises a plate member, a lower member, a spring member, a pushing member, an upper member, a support member, and a pressing member. According to the present invention, the method for manufacturing a distribution pipe comprises a spring insertion step, a lower fastening step, an upper fastening step, a support insertion step, a pipe insertion step, and a shaping step. According to the present invention, costs for replacing an existing pipe with a pipe having a distribution pipe can be remarkably reduced.

Description

Pipe forming device and manufacturing method of distribution pipe using this device

The present invention relates to a device for manufacturing a distribution pipe by connecting a plurality of pipes (pipe) and a method for manufacturing a distribution pipe using the same, and more particularly, by applying pressure to the end of the cylindrical pipe followed by the surface of another pipe The present invention relates to a tube forming apparatus for molding into an easy-to-glue shape and a method for forming a dispensing tube by forming an end of the tube with the apparatus and joining it to the surface of another tube.

In general, several pipes (pipes) for supplying and discharging fluids, such as water and gas, are installed in a building or a factory facility. It can be divided into a distribution pipe that distributes the fluid flowing along the main pipe to various places.

The invention relates to a conventional apparatus or / and method related to such a distribution tube, and the like. Manufacturing method and apparatus thereof, "pipe for fluid conveyance and distribution without welded part" of Korean Utility Model Publication No. 20-0265666 and "manufacture method and distribution method of boiler distribution pipe of Korean Patent Publication No. 10-0859310" Distribution tube ”has been proposed and published.

The "hot water distribution pipe for boiler and its manufacturing method" of the Republic of Korea Patent Publication No. 199595-029686 is in communication with the water supply pipe and the return pipe of the boiler body has an inlet and outlet for supplying or returning hot water, and is formed by bending and welding a thin plate It is configured to include a distribution pipe main body and a distribution port in communication with the heating pipes piped into the room and the thin plate constituting the distribution pipe main body is formed integrally with the distribution pipe main body by press forming, easy to manufacture An apparatus and method for mass production have been proposed. The method and apparatus for manufacturing a fluid distribution tube of Korean Patent Laid-Open Publication No. 1997-0014862 disclose a surface by applying a force to a conical tab inserted into an inner surface of a distribution tube. The protrusion formed by discharging to the outside through the hole formed in the hole has an arc surface, This invention relates to a manufacturing method and apparatus have been proposed to the fluid flow, and so can be maintained naturally manifold, so as to be uniformly distributed in each of the plurality of branch pipes to be.

In addition, the Republic of Korea Patent Publication No. 10-0859310 "Method of manufacturing the distribution pipe for the boiler and the distribution pipe using the same" in the drilling step of drilling a plurality of connection holes in the plate, and the bending hole inward to expand the connection hole Burring step of forming a, a bending step of bending both sides of the plate by the pressing means, a cutting step of cutting the plate to a predetermined length, a molding step of forming the plate into a cylindrical shape, and the minutes from the pressing means It is configured to include a stripping step of removing the pipe, a welding step of welding the cut portion of the distribution pipe and a shaft pipe step of condensing both ends of the distribution pipe, the production cost is low, and the leakage phenomenon of the welding site The invention regarding the manufacturing method and the apparatus which can be prevented were proposed.

However, the conventional inventions described above are inventions that can be applied only before the pipe is formed in a building, such as forming a hole for installing a distribution pipe in the manufacturing process of the pipe, or before the pipe is installed in a building. Since there is a problem that is difficult to apply, there is a need for an invention regarding an apparatus and a method which can solve such problems and can be applied anywhere regardless of whether a tube is installed, and can be manufactured inexpensively and simply.

Republic of Korea Patent Publication No. 1995-959686 (Nov. 24, 1995) Korean Unexamined Patent Publication No. 1997-0014862 (1997. 04. 28) Republic of Korea Patent Publication No. 10-0859310 (2008. 09. 12)

Tube forming apparatus according to the present invention and a method for manufacturing a distribution tube using the same is a technique proposed to solve the problems of the conventional invention as described above,

In order to distribute the direction of the fluid flowing along the single channel inside the pipe installed in the interior of the building through various paths, the existing pipe had to be replaced with the pipe in which the distribution pipe was installed. The purpose.

Pipe forming apparatus and a distribution pipe manufacturing method using the same according to the present invention to realize the above object,

A plate member 100 in which a through hole is formed; A lower member formed at an upper end of the lower groove connected to the through hole and fastened below the plate member; A spring member inserted into the lower groove; A pressing member configured to be inserted into the lower groove and supported by the spring member, and a pressing upper portion penetrating through the through hole and extending upward of the plate member; An upper member connected to the through hole, the upper member being fastened above the plate member; A support member inserted into the upper hole and contacting the pressed upper portion; And a pressing member for forming a part of the body by applying pressure to an exposed end portion of a pipe inserted into the upper hole. It proposes a tube forming apparatus characterized in that it comprises a.

In addition, the spring insertion step of inserting the spring member in the lower groove formed on the upper end of the lower member; Lower fastening the lower member below the plate member in a state in which the pressed lower part of the pressing member is inserted into the lower groove, and the pressed upper part of the pressing member penetrates a through hole formed in the plate-shaped plate member. step; An upper fastening step of fastening the upper member above the plate member such that the upper hole formed in the through hole and the upper member is connected; A support insertion step of inserting a support member into the upper hole; A pipe insertion step of inserting a portion of a pipe into the upper hole; And a molding step of bringing the pressing member into close contact with the end of the tube exposed to the outside of the upper hole and applying pressure. It proposes a distribution pipe manufacturing method using a pipe forming apparatus characterized in that it comprises a.

Pipe forming apparatus according to the present invention and a distribution pipe manufacturing method using the same,

By forming the distribution tube according to the diameter of the pipe by using the pressing member and then welding and joining the perforated tube, the effect of greatly reducing the cost of replacing the distribution tube has occurred.

At this time, the pressure is lowered downward, but by reducing the impact applied to the distribution pipe formed by using the pressing member and the support member raised by the spring member, the effect of preventing the distribution pipe breakage occurred,

Since the configuration of the device is simple, the effect of producing a distribution pipe can be easily produced at low cost.

1 is an external perspective view showing a state in which the plate member, the lower member and the upper member of the pipe forming apparatus according to the present invention are combined.
Figure 2 is a joining flowchart of the tube forming apparatus according to the present invention.
Figure 3 is an external perspective view showing a pressing member of the tube forming apparatus according to the present invention.
Figure 4 is a flow chart of the distribution tube manufacturing method using a tube forming apparatus according to the present invention.
Figure 5 (a) and Figure 5 (e) is an exemplary view showing an embodiment of forming the end of the tube by using a distribution tube manufacturing method using a tube forming apparatus according to the present invention.

The present invention relates to an apparatus for producing a distribution pipe by joining a plurality of pipes,

A plate member 100 in which a through hole 101 is formed; A lower member 110 formed at an upper end thereof connected to the through hole 101 and fastened below the plate member 100; A spring member 120 inserted into the lower groove 111; The pressing lower portion 131 inserted into the lower groove 111 and supported by the spring member 120 and the pressing upper portion 132 extending through the through hole 101 and upwardly of the plate member 100. A pressing member (130) consisting of; An upper member 140 connected to the through hole 101 and formed to be fastened above the plate member 100; A support member 150 inserted into the upper hole 141 to be in contact with the pressed upper portion 132; And a pressing member 160 in which a part of the body is molded by applying pressure to an exposed end portion of a tube inserted into the upper hole 141. Characterized in that comprises a.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

First, as shown in Figs. 1 and 2, the tube forming apparatus according to the present invention is characterized in that it comprises a plate member 100 in which a through hole 101 is formed.

The plate member 100 is a plate-shaped component in which a through hole 101 penetrating an upper end and a lower end is formed at a center thereof, and a plurality of bolt grooves are formed at a lower end of the through hole 101. Thus, the lower member 110 may be fastened downward, and a plurality of bolt holes may be formed to penetrate the upper and lower ends so that the upper member 140 may be fastened upward.

In addition, a plurality of bolt grooves for fastening the upper member 140 upward instead of the bolt hole may be formed around the through hole 101 at the upper end of the plate member 100, and formed at the lower end of the plate member 100. Instead of the bolt groove, a bolt hole penetrating the top and the bottom may be formed. The shape of the upper member 140 and the lower member 110 may be partially modified according to the difference in the configuration, and the upper member and the lower member may be modified. The length and insertion direction of the bolt for fastening the 110 may be configured differently.

In addition, a lower groove 111 is formed at the center of the upper end of the lower member 110, so that the lower groove 111 may be connected to the through hole 101 when fastened below the plate member 100. A plurality of bolt holes corresponding to the plurality of bolt grooves formed at the lower end of the plate member 100 are formed around the lower groove 111 so that the lower member 110 and the plate member 100 may be fastened in a bolting manner. However, instead of the bolt groove, the bolt groove may be formed in the same direction as the lower groove 111 to be fastened below the plate member 100.

As shown in FIG. 2, when the compression is applied, the lower groove 111 is inserted therein with a spring member 120 having a corresponding stress formed therein, and is then pressed by the spring member 120. The diameter of the through hole 101 is a space in which the pressing member 130 composed of the pressing upper portion 132 extending through the 131 and the through hole 101 and extending upward of the plate member 100 is inserted. It is configured to have a longer diameter to prevent the departure of the spring member 120 and the pressing member 130 to the outside of the lower groove 111.

That is, the spring member 120 is preferably composed of a compression spring in which a stress corresponding thereto is formed when compression is applied.

Therefore, the diameter of the spring member 120 and the diameter of each of the pressing lower portion 131 of the pressing member 130 should be configured to have a diameter longer than the diameter of the through hole 101, furthermore The spring member 120 is preferably configured to stably support the lower end of the pressing lower portion 131 of the pressing member 130 without flowing in the lower groove 111, and the pressing lower portion 131 is The 111 is preferably configured to have a length that is the same as or similar to the diameter of the through hole 101 so that it can be stably supported by the spring member 120 without being flown in the inside, but the upper portion 132 and the through hole are pressed. Flow is also prevented by the relationship of 101, so it is not necessarily limited thereto.

As a result, the diameter of the spring member 120 and the diameter of the pressing lower portion 131 may be the same or similar length, but the diameter of the spring member 120 is not formed longer than the diameter of the pressing lower portion 131 Obviously, the bottom of the lower groove 111 is formed with one or more spring grooves into which the distal end of the spring member 120 is inserted to prevent the flow of the spring member 120 in the lower groove 111. And at the same time it can be configured to be fixed to any one of the plurality of spring members 120 having a variety of diameters.

In addition, the spring member 120 has a portion of the pressing upper portion 132 of the pressing member 130 inserted into the lower groove 111 penetrates the through hole 101 to the upper side of the plate member 100. The length of the pressing member 131 should be formed so that the length of the pressing member 130 may be in close contact with the lower end of the plate member 100.

Accordingly, the pressing member 130 may be temporarily lowered by an external pressure downward, but when the whole or a part of the external pressure by the pressing member 160 is lost, the pressing member 130 may rise by the stress of the spring member 120. The pressed lower portion 131 is in close contact with the lower end of the plate member 100, and a part of the pressed upper portion 132 passes through the through hole 101 to return to the original state protruding upward of the plate member 100. .

In addition, the upper member 140 is formed so that the upper hole 141 penetrates the upper end and the lower end, so that the upper hole 141 can be connected to the through hole 101 when fastened above the plate member 100, and the upper hole A plurality of bolt grooves corresponding to the plurality of bolt holes penetrating the upper and lower ends of the plate member 100 are formed around the 141 so that the upper member 140 and the plate member 100 may be fastened in a bolting manner. One or more bolt holes corresponding to the bolt grooves or the bolt holes formed in the plate member 100 may be formed to allow the upper member 140 and the plate member 100 to be fastened.

At this time, the length of the upper member 140, that is, the length of the upper hole 141 is formed to be shorter than the length of the tube is inserted into the upper hole 141 is formed so that a portion of the tube in the upper hole 141 The other part should be configured to be exposed to the outside of the upper member 140.

In addition, the support member 150 inserted into the upper hole 141 and contacting the end of the pressed upper portion 132 is sized to have a loose fit that generates a slight gap with the upper hole 141. It is possible to move upward or downward in the upper hole 141 smoothly, but the flow range to the side is limited, it is characterized in that it is configured to stably support the tube to be inserted later without shaking.

In addition, as shown in Figure 3, the tube forming apparatus according to the present invention is a pressing member 160 for molding a portion of the body by applying pressure to the exposed end of the tube (pipe) inserted into the upper hole (141). Characterized in that it comprises a, in particular, the pressing member 160, the handle portion 161 is gripped by the hand, and both ends of the circular ends of the handle portion 161 in a state facing both sides, respectively The cylindrical body portion 162 positioned in the protruding portion formed below the body portion 162, characterized in that it comprises a protrusion 163 having a form of the upper and lower straits (上 廣 下 夾). .

The handle portion 161 can be easily gripped by the user to manufacture the distribution pipe by using the present invention, the pressing member 160, the shape so that the top can be pressed down or hit down using a tool. It is formed so as to apply pressure downward to the tube inserted into the upper hole 141, the body portion 162 is a tube that is different from the other end of the tube by applying pressure by contacting the end of the tube with a curved surface To be molded into a shape that can be in contact with the surface of the.

In addition, the protruding portion 163 is inserted into the flow path inside the tube and extends the diameter of the tube end by a predetermined length and at the same time curved surface, so that the end of the molded tube can easily fit on the surface of the other tube, Accordingly, a plurality of inclined surfaces may be formed in a semicircle shape or a side surface, but is not necessarily limited thereto.

At this time, a plate-shaped weight portion 164 is positioned between the handle portion 161 and the body portion 162 to increase the weight of the pressing member 160, the pressure applied to the tube Can be increased.

In addition, since the shape of the tube end portion formed by the pressing member 160 should be easy to attach to the surface of the other tube having a cylindrical shape, the pressing member 160 is formed in the upper hole 141. Regardless of the length of the diameter of the tube to be inserted can be formed into a shape that is easy to attach to the surface of the other tube, and can be formed of a plurality of objects of the same shape but different sizes so that the end of the tube of the same diameter can be formed in various sizes. In addition, the diameter of the upper hole 141 may also be formed in various lengths to be able to insert a tube of various diameters.

Therefore, the pressing member 160 may be configured to be assembled by selecting a plurality of body parts 162 and protrusions 163 having various diameters according to the diameter of the tube.

The lower groove 111, the through hole 101 and the upper hole 141 are connected in the same vertical line by the combination of the above components, the pressing member 130 and the supporting member 150 is The spring member 120 is simultaneously lowered by external pressure downward by the pressing member 160 to compress the spring member 120. When all or part of the external pressure is lost, the spring member 120 is simultaneously raised by the stress formed in the spring member 120. .

Therefore, the tube inserted into the upper hole 141 is lowered by a predetermined distance by the external pressure downward by the pressing member 160, so that one end exposed to the outside is formed but a part of the impact applied to the tube It can be alleviated, thereby causing the effect of preventing damage to the tube, such as deformation of the other end in contact with the supporting member 150, the stop of the pressing member 130 is configured in the form of a compression spring is applied to the tube Shock can be further alleviated.

The present invention also relates to a distribution pipe manufacturing method using an apparatus for joining a plurality of pipes to produce a distribution pipe.

Spring insertion step (S100) for inserting the spring member 120 in the lower groove 111 formed on the upper end of the lower member (110); A through hole in which the pressing lower portion 131 of the pressing member 130 is inserted into the lower groove 111 and the pressing upper portion 132 of the pressing member 130 is formed in the plate member 100 having a plate shape. A lower fastening step (S110) of fastening the lower member (110) below the plate member (100) while penetrating through 101; An upper fastening step (S120) of fastening the upper member 140 above the plate member 100 so that the upper hole 141 formed in the through hole 101 and the upper member 140 is connected; Support insertion step of inserting the support member 150 in the upper hole (141) (S130); Pipe insertion step (S140) for inserting a portion of the pipe (pipe) in the upper hole (141); Forming step (S150) to close the pressing member 160 to the end of the tube exposed to the outside of the upper hole 141 and to apply a pressure (S150); Characterized in that comprises a.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

First, as shown in Figure 4, the distribution pipe manufacturing method using a tube forming apparatus according to the present invention spring insertion step of inserting the spring member 120 in the lower groove 111 formed on the upper end of the lower member 110. Characterized in that it comprises a (S100).

As described in the embodiment of the tube forming apparatus, the spring member 120 is inserted into the lower groove 111 is a compression spring is formed when the compression is applied to the corresponding stress, the diameter of the spring member 120 It is preferable to prevent the flow in the lower groove 111 by forming the same or similar length as the diameter of the lower groove 111, but when one or more spring grooves are formed at the bottom of the lower groove 111, the diameter length May be relaxed to some extent.

Therefore, the spring member 120 is fixed to the inside of the lower groove 111 by the diameter itself formed the same or similar to the diameter of the lower groove 111 or fixed by the spring groove other than the other means It does not need to be provided.

In addition, as shown in Figure 4, the distribution pipe manufacturing method using the tube forming apparatus according to the present invention is a state in which the pressing lower portion 131 of the pressing member 130 is inserted into the lower groove 111, the pressing A lower portion of the lower member 110 that fastens the lower member 110 under the plate member 100 in a state where the pressed upper portion 132 of the member 130 penetrates the through hole 101 formed in the plate member 100 having a plate shape. Characterized in that it comprises a fastening step (S110).

The lower fastening step (S110) is a step to be followed after the preceding step of the spring insertion step (S100), in which the spring member 120 and the pressing member 130 are inserted into the lower groove 111. Has a purpose for fastening the lower member 110 below the plate member 100, the fastening method of the plate member 100 and the lower member 110 to the plate member 100 and the lower member 110, respectively It may be configured differently depending on the configuration of the formed bolt groove and / or bolt hole.

In this case, since the spring member 120 is inserted into the lower groove 111 first, the pressing member 130 inserted after the spring member 120 may be supported by the spring member 120, but the lower member 111 may be disposed below the plate member 100. When the lower member 110 is fastened, the pressing member 130 receives continuous pressure upward by the spring member 120 and the plate member 100, and is caused by the external pressure downward by the pressing member 130. It may be temporarily lowered, but when all or part of the external pressure is lost, the spring member 120 rises due to the stress and returns to its original configuration.

In addition, as shown in Figure 4, the distribution pipe manufacturing method using a tube forming apparatus according to the present invention is the plate member so that the through hole 101 and the upper hole 141 formed in the upper member 140 is connected It characterized in that it comprises a top fastening step (S120) for fastening the upper member 140 above the (100).

The upper fastening step (S120) is a step for the purpose of fastening the plate member 100 and the upper member 140, but may be succeeded after the preceding step of the lower fastening step (S110) but the lower fastening step (S110) It may be more advanced, the fastening method of the plate member 100 and the upper member 140, and the preceding and trailing relationship between the lower fastening step (S110) is a bolt formed in each of the plate member 100 and the upper member 140 It may be configured differently depending on the configuration of the groove and / or bolt hole.

In addition, as shown in Figure 4, the distribution pipe manufacturing method using the tube forming apparatus according to the present invention comprises a support insertion step (S130) for inserting the support member 150 in the upper hole (141). Characterized in that, the support insertion step (S130) is a step for the purpose of injecting the support member 150 into the upper hole 141 of the upper member 140, the upper fastening step (S120) Should be followed after the preceding, and is the last step to construct the tube forming apparatus.

In addition, as shown in Fig. 4, Fig. 5 (a) and Fig. 5 (b), the distribution pipe manufacturing method using the pipe forming apparatus according to the present invention is a part of the pipe (pipe) to the upper hole (141). It is characterized in that it comprises a pipe insertion step (S140) to insert, as shown in Figure 5 (c) to 5 (e), after the pipe insertion step (S140) of the upper hole 141 It is characterized in that it comprises a molding step (S150) for close contact with the pressing member 160 to the end of the tube exposed to the outside and applying a pressure.

Body portion 162 of the pressing member 160 used in the forming step (S150) is configured to have a diameter equal to or similar to the diameter of the tube to join the tube formed using the tube forming apparatus Preferably, the protrusion 163 is preferably configured to have the same or similar diameter to the diameter of the tube to be molded, and thus the pressing member 160 has a plurality of body portions 162 and protrusions having various diameters ( 163 may be configured to be assembled by selecting a diameter suitable for the diameter of the tube.

Therefore, the method of manufacturing a distribution pipe using the tube forming apparatus according to the present invention measures the diameter of the pipe before assembling the pressing member 160, and measures the body portion 162 having the same or similar diameter as the measured pipe diameter. It may be configured to include a selection step (not shown) to select, the weight portion 164 is positioned between the handle portion 161 and the body portion 162 to be assembled to weigh the weight of the pressing member 160 By raising it, the pressure on the tube can be increased.

In addition, as shown in Figure 4, the distribution pipe manufacturing method using a tube forming apparatus according to the present invention is a perforation step (S160) to form one or more holes in the tube and the end of the tube formed in the hole formed position It characterized in that it comprises a welding step (S170) for matching and welding, the perforation device for the formation of holes can use any known device that can form a hole in the pipe, for welding the distribution pipe to the main pipe Since both the welding apparatus and the welding method can use a well-known apparatus and method, detailed description about this is abbreviate | omitted.

The above-described embodiments are provided by way of example so that the technical spirit of the present invention can be sufficiently delivered to those skilled in the art to which the present invention pertains. It is not limited and may be embodied in other forms.

Parts not related to the description are omitted in the drawings in order to clearly describe the present invention, in the drawings, the width, length, thickness, etc. of the components may be exaggerated or reduced for convenience.

Also, like reference numerals denote like elements throughout the specification.

100: plate member 101: through hole
110: lower member 111: lower groove
120: spring member 130: pressing member
131: pressed lower 132: pressed upper
140: upper member 141: upper hole
150: supporting member 160: pressing member
161: handle portion 162: body portion
163: protrusion 164: weight part
S100: Spring insertion step S110: Lower fastening step
S120: upper fastening step S130: base insertion step
S140: Tube Insertion Step S150: Forming Step
S160: punching step S170: welding step

Claims (6)

A plate member 100 in which a through hole 101 is formed;
A lower member 110 formed at an upper end thereof connected to the through hole 101 and fastened below the plate member 100;
A spring member 120 inserted into the lower groove 111;
A pressing member which is inserted into the lower groove 111 and comprises a pressing lower portion supported by the spring member 120 and a pressing upper portion extending through the through hole 101 and extending upward of the plate member 100 ( 130);
An upper member 140 connected to the through hole 101 and formed to be fastened above the plate member 100;
A support member 150 inserted into the upper hole 141 to be in contact with the pressed upper portion; And
A pressing member 160 in which a part of the body is molded by applying pressure to an exposed end of a tube inserted into the upper hole 141; Tube forming apparatus, characterized in that configured to include.
The method of claim 1,
The diameter of the pressing lower portion (131) is a tube forming apparatus, characterized in that formed longer than the diameter of the through hole (101).
The method of claim 1,
The pressing member 160,
A handle portion 161 gripped by hand;
Cylindrical body portion 162 which is located below the handle portion 161 in a state in which both ends are circular facing both sides;
A protruding portion 163 formed to protrude downward from the body portion 162 and having a form of an upper and lower strait (上 廣 下 夾); Tube forming apparatus, characterized in that configured to include.
The method of claim 3,
The protrusion 163 is,
Tube forming apparatus, characterized in that a plurality of inclined surface is formed on the side.
Spring insertion step (S100) for inserting the spring member 120 in the lower groove 111 formed on the upper end of the lower member (110);
The pressing bottom of the pressing member 130 is inserted into the lower groove 111 and the pressing top of the pressing member 130 penetrates the through hole 101 formed in the plate member 100. A lower fastening step of fastening the lower member 110 to the lower side of the plate member 100;
An upper fastening step (S120) of fastening the upper member 140 above the plate member 100 so that the upper hole 141 formed in the through hole 101 and the upper member 140 is connected;
Support insertion step of inserting the support member 150 in the upper hole (141) (S130);
Pipe insertion step (S140) for inserting a portion of the pipe (pipe) in the upper hole (141); And
Forming step (S150) of pressing the pressing member 160 in close contact with the end of the tube exposed to the outside of the upper hole (141) by applying a pressure (S150); Distribution pipe manufacturing method using a pipe forming apparatus, characterized in that comprises a.
The method of claim 5,
Distribution pipe manufacturing method using the tube forming apparatus,
Perforating step of forming one or more holes in the tube (S160); And
Welding step (S170) of matching and welding the ends of the formed tube to the position where the hole is formed; Distribution pipe manufacturing method using a pipe forming apparatus, characterized in that it further comprises.

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