Pipe, method for forming a branched branch in a main pipe

Abstract

To obtain a branch having a rising height and a wall thickness sufficient and necessary for screw-cutting at a region in which the branch is erected from a main pipe, in a pipe having the branch which is erected toward the outside in a circumferential direction from a sidewall of the main pipe.SOLUTION: A hole is drilled in a point in which a branch of a sidewall of a main pipe 10 is formed. Next, the main pipe 10 and a metal mold 20 are made to adhere to each other, and a dowel 40 is arranged inside the main pipe 10. The metal mold 20 comprises an opening for making the dowel penetrate in a vertical direction. Also, the metal mold 20 is molded so as to coincide with a shape in which the branch is erected from the main pipe at a wall 22 in a left-and-right direction. In a process in which the dowel 40 gets out toward the outside from the inside of the main pipe 10, a region constituting a periphery of the hole which is drilled at the sidewall out of the sidewall of the main part 10 is deformed, and the branch 15 is thereby formed at the main pipe 10.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a pipe through which a fluid flows inside, and having a "rise" for branching that rises outward in the circumferential direction from the wall surface of the main pipe.

Background Art

[0002] In a pipe through which a fluid flows inside, there are many cases where it is necessary to provide a "rise" for branching on the wall surface of the main pipe. For example, in a production factory for foods, pharmaceuticals, etc., a case where the fluid flowing through the main pipe is branched into a plurality of branches for the next process. Such cases are not limited to the devices of such factories, but there are also small-scale applications such as a case where hot water is flowed into a plurality of shower rooms, and hot water is branched from the main pipe and flowed into individual shower rooms. Cases where it is necessary to provide a "rise" for branching from the wall surface of the main pipe can be seen in all fields.

[0003] For the "rise" for branching, depending on the application of the branching destination, it is necessary to provide a threaded portion for attaching various parts, such as attaching another pipe, attaching a shower head, or attaching a cap for closing the rise.

[0004] Conventionally, as a means for providing a "rise", as shown in FIG. 10, a means of drilling an insertion hole 101 in the main pipe 100 and inserting and welding a threaded pipe 102 into the insertion hole 101 has been used. In the case of this means, since the main pipe is distorted by the heat of welding, it was necessary to correct the distortion after welding. Also, it was necessary to remove the discoloration due to heat. Since the costs for these processes were added, the pipe with a rise had to be expensive. Furthermore, in the case of welding, there were also problems such as the legs of the threaded pipe 102 protruding inside the main pipe 100 and the unevenness of the welding remaining at the welding site causing resistance to the flow of the fluid substance and dirt accumulating at the welding site.

[0005] As a means of providing a "rise", there is also the means shown in Patent Document 1. In the flaring tube described in Patent Document 1, a branch 111 protruding from the main pipe 110 is obtained by flaring using bolts. Patent Document 1 describes that with the above means, female threads can be processed on stainless steel with a thickness of 2.1 mm using a JIS standard R1 / 8 (old JIS standard PT1 / 8) tap (specification of Patent Document 1

[0009] and

[0012] ). Here, when converting the JIS standard notation to the metric system, it is as shown in the following table.

[0006]

Table 1

[0007] That is, the female thread of JIS standard R1 / 8 described as being processable in Patent Document 1 has an inner diameter of approximately 8.6 mm.

[0008] For a branch with female threads having an inner diameter of approximately 8.6 mm on the stainless steel with a thickness of 2.1 mm described in Patent Document 1, since the thickness of the stainless steel is relatively thin and the diameter of the branch is relatively small, it may be possible to process such a branch.

[0009] Here, the flaring process will be described with reference to FIG. 12. In the flaring process, a hole 121 is drilled in the plate material 120, the block 125 is screwed into the hole 121, and pulled out with a strong force to obtain the branch 128. That is, the branch 128 is formed by extending the material by changing the direction in which the plate material 120 extends by 90 degrees following the movement of the block. For this reason, when the thickness of the plate material increases, the deformation resistance of the material increases, and when the periphery of the hole 121 in the plate material 120 rises to form the branch 128, the corner portion 129 forms a curve with a large curvature and greatly deforms, resulting in a decrease in the wall thickness. Therefore, it is not possible to form a rise with a height and wall thickness necessary and sufficient for threading.

Prior Art Documents

Patent Documents

[0010] Patent Document 1 Utility Model Registration No. 3173050 Summary of the Invention Problems to be Solved by the Invention

[0011] A pipe provided with a branch pipe rising outward in the circumferential direction from the side wall of the main pipe, and the problem is to obtain a pipe in which the strain and discoloration of the main pipe due to the heat of welding of the branch pipe do not occur.

[0012] A pipe provided with a branch pipe rising outward in the circumferential direction from the side wall of the main pipe, and the problem is to obtain a pipe in which there are no irregularities around the welded part due to welding of the branch pipe and no protrusion of the branch pipe.

[0013] A pipe provided with a branch pipe rising outward in the circumferential direction from the side wall of the main pipe, and the problem is to obtain a branch pipe having a rising height and wall thickness necessary and sufficient for threading at the part where the branch pipe rises from the main pipe.

[0014] A pipe provided with a branch pipe rising outward in the circumferential direction from the side wall of the main pipe, and the problem is to obtain a pipe in which the branch pipe is not provided by welding and has a tapered thread cut of JIS standard R1 / 4, R3 / 8, R1 / 2, R3 / 4, or R1.

[0015] A pipe provided with a branch pipe rising outward in the circumferential direction from the side wall of the main pipe, and the problem is to obtain a pipe in which the branch pipe is not provided by welding and the thickness of the main pipe is 2.2 mm or more. Means for Solving the Problems

[0016] (1) It includes a main pipe and a branch pipe that rises circumferentially outward from the side wall of the main pipe. The branch pipe is formed by the deformation of a part of the side wall of the main pipe that constitutes the periphery of the hole drilled in the side wall. The deformation is by flanging, and the deformation is achieved by a pipe that is along a mold configured to match the shape of the rising part where the branch pipe rises from the main pipe to solve the problem. (2) The problem is solved by the pipe according to (1), characterized in that a female thread is formed on the inner wall of the branch pipe. (3) The problem is solved by the pipe according to (1), characterized in that the thickness of the main pipe is 2.2 mm or more. (4) The problem is solved by the pipe according to (2), characterized in that the inner diameter of the female thread is 9 mm or more. (5) The problem is solved by the pipe according to (1), characterized in that the mold covers almost the entire main pipe from the outside. (6) It includes a main pipe and a branch pipe that rises circumferentially outward from the side wall of the main pipe. The branch pipe is formed by the deformation of a part of the side wall of the main pipe that constitutes the periphery of the hole drilled in the side wall. The problem is solved by a pipe with a tapered thread cut of JIS standard R1 / 4, R3 / 8, R1 / 2, R3 / 4, or R1 on the branch pipe. (7) It includes a main pipe and a branch pipe that rises circumferentially outward from the side wall of the main pipe. The branch pipe is formed by the deformation of a part of the side wall of the main pipe that constitutes the periphery of the hole drilled in the side wall. The problem is solved by a pipe with a thickness of the main pipe of 2.2 mm or more. (8) A method of forming a branch extending circumferentially outward from the side wall of a main pipe, comprising: a main pipe having a hole drilled at a location on the side wall where the branch is to be formed; and a mold having an opening penetrating in the vertical direction for passing a slug and the left and right walls thereof being shaped to conform to the shape of the branch rising from the main pipe. The main pipe and the mold are arranged such that the hole in the main pipe is located at the center of the opening of the mold. A slug disposed inside the main pipe is inserted through the hole in the main pipe, and the slug is moved through the upper opening of the mold toward the lower opening of the mold and withdrawn from the lower opening of the mold. In the process of the slug disposed inside the main pipe passing from the inside to the outside of the main pipe while closely sandwiching the wall around the hole drilled in the wall of the main pipe between the slug and the mold, the portion of the side wall of the main pipe that constitutes the periphery of the hole drilled in the side wall is deformed to form a branch on the main pipe, thereby solving the problem. (9) A method of forming a branch extending circumferentially outward from the side wall of a main pipe, comprising: a mold A having an axially penetrating through-hole for passing a slug and the circumferential wall thereof being shaped to conform to the shape of the branch rising from the main pipe; and a mold B shaped to conform to the shape of the main pipe. A main pipe having a hole drilled at a location on the side wall where the branch is to be formed is disposed and closely fitted between the two molds such that the hole in the main pipe is located at the center of the through-hole of the mold A. A slug disposed inside the pipe is moved axially while being in close contact with the wall surface of the through-hole of the mold A and withdrawn to the outside of the pipe. In the process of the slug disposed inside the main pipe passing from the inside to the outside of the main pipe while closely sandwiching the wall around the hole drilled in the wall of the main pipe between the slug and the mold A, the portion of the side wall of the main pipe that constitutes the periphery of the hole drilled in the side wall is deformed to form a branch on the main pipe, thereby solving the problem.

[0017] The branch is obtained by deforming the portion of the side wall of the main pipe that constitutes the periphery of the hole drilled in the side wall, and is not obtained by welding a pipe for the branch. Therefore, there is no step of welding the branch to the main pipe. Since there is no welding step, distortion and discoloration of the main pipe do not occur. Further, no unevenness or the like occurs at the rising portion where the branch rises from the main pipe.

[0018] The deformation of the part that constitutes the periphery of the hole drilled in the side wall of the main pipe is caused by the block passing through the main pipe from the inside to the outside while closely sandwiching the wall around the hole drilled in the wall of the main pipe between this block and the mold. Therefore, the mold is molded to match the shape of the rising part where the branch rises from the main pipe, and has an opening penetrating in the vertical direction for the block to pass through. The part molded to match the shape of the rising part where the branch rises from the main pipe is provided in the passage through which the block passes in the mold.

[0019] Internal threads are formed on the inner wall of the branch by tapping.

Advantages of the Invention

[0020] A pipe provided with a branch rising outward in the circumferential direction from the side wall of the main pipe can be obtained without relying on welding of the branch. For this reason, no distortion or discoloration occurs in the main pipe, and a pipe without unevenness around the welded part due to welding of the branch or protrusion of the branch can be obtained. Therefore, the working process can be reduced. In addition, the branch part can be made to have little resistance to any fluid substance, and a pipe with high performance can be obtained.

[0021] A pipe provided with a branch rising outward in the circumferential direction from the side wall of the main pipe, wherein the branch has no curve with a large curvature at the part where it rises from the main pipe, and a branch with a sufficient rising height and wall thickness for threading can be obtained. Thereby, a branch with an inner diameter of the internal thread of 9 mm or more can be provided. In addition, a branch with an outer diameter of the external thread of 10 mm or more can be provided. Further, a branch with a thread cut of a tapered thread of JIS standard R1 / 4, R3 / 8, R1 / 2, R3 / 4, or R1 can be provided. Also, a branch can be provided even when the thickness of the main pipe is 2.2 mm or more.

[0022] Since there is no distortion in the main pipe, there is a high degree of freedom in terms of the position where the branch pipe is provided, the size of the branch pipe, and the shape of the main pipe. As a result, it can be applied to pipes used in products with complex designs. The degree of freedom in product design is dramatically improved.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0024] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Examples

[0025] Example 1 is shown in FIGS. 1 to 8. Referring to FIG. 1, a pilot hole 11 is drilled at a position on the wall of the main pipe 10 where a branch is to be provided. The pipe is made of stainless steel. The mold 20 has an opening penetrating in the vertical direction. The mold 20 also includes a pipe mating surface 21 and a branch mating surface 22. The pipe mating surface 21 is molded to fit the outer shape of the pipe in the mold 20. The branch mating surface 22 is molded to fit the outer shapes of the main pipe 10 and the branch protruding from the main pipe. The pipe mating surface 21 and the branch mating surface 22 are smoothly connected. The branch mating surface 22 is also a wall surface formed between the upper opening and the lower opening of the opening penetrating the mold in the vertical direction.

[0026] The base 30 has a hole 31 at its central part.

[0027] Referring to FIGS. 1 and 2, the mold 20 is placed on the base 30. At this time, the lower opening of the branch mating surface 22 of the mold 20 is positioned near the center of the hole 31 of the base 30. The main pipe 10 is placed on the pipe mating surface 21 of the mold 20 with the pilot hole 11 facing downward. The position of the pilot hole 11 of the main pipe 10 is aligned with the center of the upper opening of the branch mating surface 22.

[0028] Referring to FIGS. 2 and 3, the piece 40 is inserted into the main pipe 10 from the opening 12 of the main pipe to the inside of the pipe. Although not shown, the piece 40 has a threaded hole at the bottom and is connected to the tip of the bar 45 by screwing. The piece 40 is placed at the position where the pilot hole 11 of the main pipe 10 is located. The tip of the bar 45 is inserted from the hole 31 of the base, aligned with the piece 40 through the lower opening of the mold and the pilot hole 11 of the pipe, and the bar 45 and the piece 40 are screwed together and connected.

[0029] Referring to FIGS. 3 and 4, the bar 45 is pulled downward with a strong force using a hydraulic cylinder or the like. When the plate 40 exits downward from the inside of the main pipe 10, the periphery of the lower hole 11 of the main pipe extends along the branch joint surface 22 of the mold, and the branch 15 rises. At this time, since the periphery of the lower hole 11 of the pipe extends along the branch joint surface 22 of the mold, the rising part 14 of the branch 15 does not form a curve with a large curvature. The branch 15 has sufficient height and thickness for threading.

[0030] Next, a thread 16 is formed on the inner wall of the branch 15 by tapping. As shown in FIG. 5, a branch 15 having sufficient height and having a thread 16 on the inner wall is obtained.

[0031] As shown in FIG. 6, a large number of branches 15 can be provided on the main pipe 10. In the case of the technology of the present application, the branch 15 can be provided at a location very close to the thread 18 at the end of the main pipe. In the case of the conventional means of attaching the branch by welding, since the pipe is deformed by the heat of welding, the branch 15 cannot be provided at a location very close to the thread 18 of the main pipe. However, according to the means of the present application, since there is no welding process and the main pipe is not deformed, the branch 15 can be provided at a position close to the thread 18 of the main pipe.

[0032] As shown in FIG. 7, in the case of the technology of the present application, the degree of freedom in the position where the branches (15, 17) are provided is high. A space for arranging the mold for generating the branch can be secured, and as long as there is no problem with the strength of the main pipe, the branch can be provided on the main pipe 10.

[0033] In FIG. 8, the main pipe 18 has a shape that curves. In the case of the technology of the present application, a space for arranging the mold for generating the branch can be secured, and as long as there is no problem with the strength of the main pipe, the branch 19 can be provided even on the main pipe having a curved shape.

Example

[0034] Example 2 is shown in Fig. 9. In Example 2, the pipe is clamped with two molds, and the spacer is removed from above to provide a branch pipe. When providing a branch pipe by the means of Example 2, since the entire circumferential direction of the main pipe is surrounded by the mold, deformation of the pipe is extremely suppressed. Therefore, when precision of the pipe shape is required, the means of Example 2 is suitable. Also, when the pipe is likely to deform due to reasons such as the thin thickness of the main pipe, the means of Example 2 is also suitable. In Example 2, the spacer is removed from above, but it is also possible to remove the spacer from below with the same configuration. The direction of removing the spacer can be adjusted according to the shape of the pipe and the position of the branch pipe.

[0035] The mold 70 is provided with a mating surface with the outer shape of the main pipe. The mold 60 is provided with a branch pipe mating surface in addition to the mating surface with the outer shape of the main pipe. The branch pipe mating surface is formed to fit the outer shapes of the main pipe and the branch pipe protruding from the main pipe. The mating surface with the outer shape of the main pipe and the branch pipe mating surface are smoothly connected. The branch pipe mating surface is also a part of the wall surface formed between the inlet and the outlet of the spacer among the openings (through holes 61) penetrating in the axial direction of removing the spacer.

[0036] A pilot hole 11 is drilled at the location of the main pipe where the branch pipe is to be provided.

[0037] As shown in (a), first, the mold 70 is set on a stand (not shown) with the mating surface with the outer shape of the main pipe facing upward. Next, the main pipe 10 is placed on the mold 70 so that the pilot hole 11 is located directly above.

[0038] Next, the mold 60 is fixed to the frame body 80. The frame body 80 is movable up and down by a hydraulic cylinder (not shown). Next, the mold 60 is placed further above the main pipe 10 placed on the mold 70. At this time, the position of the main pipe is adjusted so that the pilot hole 11 of the main pipe 10 is located at the center of the through hole 61 of the mold 60. Next, the mold 60, the mold 70, and the main pipe 10 are pressed together by a hydraulic cylinder (not shown) via the frame body 80.

[0039] Next, insert the plate 40 into the main pipe 10 from the opening of the main pipe into the interior of the main pipe. Next, insert the bar 45 through the through-hole 61 of the mold 60, attach one end of the bar 45 to the hydraulic cylinder 81 provided on the frame 80, and attach the plate 40 to the other end of the bar 45. Next, pull the bar 45 upward with a strong force by the hydraulic cylinder 81. As the plate 40 passes through the through-hole 61 of the mold 60, a branch 15 that rises outward in the circumferential direction is formed on the side wall of the main pipe 10 as shown in (b).

Explanation of Signs

[0040] 10 Main pipe 11 Pilot hole 12 Opening 14 Fillet 15 Branch 16 Threading 17 Branch 18 Threading of the main pipe 19 Branch 20 Mold 21 Pipe mating surface 22 Branch mating surface 30 Base 31 Hole 40 Plate 45 Bar 50 Base 51 Hole 60 Mold 61 Through-hole 70 Mold 80 Frame 100 Main pipe 101 Insertion hole 102 Threaded pipe 110 Main pipe 111 Branch 120 Plate material 121 Hole 125 Plate 128 Branch 129 Fillet part

Claims

【Claim 1】 A method of forming a branch pipe that rises circumferentially outward from the side wall of a main pipe, a mold A having a through hole that penetrates in the axial direction through which a slug passes and has a diameter smaller than the diameter of the main pipe, and the circumferential wall is formed to fit the shape in which the branch pipe rises from the main pipe, between the mold A and a mold B formed to fit the shape of the main pipe, place the main pipe with a hole drilled at the location where the branch pipe of the side wall is to be formed, arrange and closely fit so that the hole in the main pipe is located at the center of the through hole of the mold A, Move the slug placed inside the main pipe axially while keeping it in close contact with the wall surface of the through hole of the mold A and pull it out to the outside of the pipe, In the process of the slug placed inside the main pipe passing through from the inside of the main pipe to the outside while closely sandwiching the wall around the hole drilled in the wall of the main pipe between the mold A, the part of the side wall of the main pipe that constitutes the periphery of the hole drilled in the side wall is deformed to form a branch pipe on the main pipe.

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