JP2010234406A - Method of working pipe - Google Patents

Method of working pipe Download PDF

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Publication number
JP2010234406A
JP2010234406A JP2009085095A JP2009085095A JP2010234406A JP 2010234406 A JP2010234406 A JP 2010234406A JP 2009085095 A JP2009085095 A JP 2009085095A JP 2009085095 A JP2009085095 A JP 2009085095A JP 2010234406 A JP2010234406 A JP 2010234406A
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Prior art keywords
pipe
end portion
roller
weight
strength
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Shozo Fujimura
昭造 藤村
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Daito Spinning Kk
NIHON TOKUSHU PIPE KK
SC Pipe Solutions Co Ltd
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Daito Spinning Kk
NIHON TOKUSHU PIPE KK
SC Pipe Solutions Co Ltd
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Priority to JP2009085095A priority Critical patent/JP2010234406A/en
Publication of JP2010234406A publication Critical patent/JP2010234406A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of working a pipe wherein the strength in the end parts of the pipe is secured and also the pipe is lightened in weight. <P>SOLUTION: In the method of working the pipe, after the end portion 1a of the pipe 1 is bent toward the inside of the radial direction of the pipe 1 by a roller, the pipe is folded until the end portion 1a is brought into close contact with the inner surface 3a of the pipe 1 by the roller 8. In this way, a predetermined thickness that can stand up to welding, for example, is secured in the end portion 1a of the pipe 1 because the wall part 3 and the end portion 1a of the pipe 1 are integrally superimposed. On the other hand, the pipe 1 is lightened in weight because the wall part 3 other than the end portion 1a is relatively reduced in the thickness. In such a way, the strength in the end portion 1a of the pipe 1 is secured and also the pipe 1 is lightened in weight. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、スピニング加工を用いたパイプ加工方法に関する。   The present invention relates to a pipe processing method using spinning processing.

パイプ同士の溶接方式として、一方のパイプの端部に他方のパイプの端部を嵌入して溶接するものや、一方のパイプの端面と他方のパイプの端面とを突き合わせて溶接するものがある。これらの溶接方式においては、パイプの端部の径を制御するために、口絞り加工や口広げ加工が用いられる場合がある（例えば、特許文献１参照）。   As a welding method between pipes, there are a welding method in which an end portion of the other pipe is inserted into an end portion of one pipe and welding is performed, and an end surface of one pipe and an end surface of the other pipe are butted. In these welding methods, squeezing or squeezing may be used to control the diameter of the end of the pipe (see, for example, Patent Document 1).

特開平９−００１２３３号公報JP-A-9-001233

ところで、例えば自動車の排気管等においては、パイプ同士の溶接部に所定の強度を要するので、パイプの端部の強度を確保するために、所定の肉厚を必要とする。しかしながら、所定の肉厚を確保しようとすると、パイプの全体の重量増加につながるおそれがある。   By the way, for example, in an exhaust pipe of an automobile, a predetermined strength is required for a welded portion between pipes. Therefore, a predetermined thickness is required to ensure the strength of the end portion of the pipe. However, if a predetermined thickness is to be ensured, there is a risk of increasing the overall weight of the pipe.

そこで、本発明は、このような事情に鑑みてなされたものであり、パイプの端部の強度を確保することができると共に、パイプの軽量化を図ることができるパイプ加工方法を提供することを目的とする。   Therefore, the present invention has been made in view of such circumstances, and provides a pipe processing method capable of ensuring the strength of the end of the pipe and reducing the weight of the pipe. Objective.

上記目的を達成するために、本発明に係るパイプ加工方法は、パイプをスピニング加工により成形するパイプ加工方法であって、パイプを回転させると共に、パイプの端部分に第１のローラーを押し当てて端部分をパイプの径方向内側に向けて曲げた後、第２のローラーによって端部分をパイプの内面に密着させることを特徴とする。   In order to achieve the above object, a pipe processing method according to the present invention is a pipe processing method for forming a pipe by spinning processing, wherein the pipe is rotated and a first roller is pressed against an end portion of the pipe. After the end portion is bent toward the inside in the radial direction of the pipe, the end portion is brought into close contact with the inner surface of the pipe by a second roller.

このパイプ加工方法では、第１のローラーによってパイプの端部分をパイプの径方向内側に向けて曲げた後、第２のローラーによってその端部分がパイプの内面に密着するまで折り曲げる。これにより、パイプの壁部と端部分とが重なり一体化されるので、パイプの端部において例えば溶接に耐え得る所定の肉厚を確保することができる。その一方で、端部以外の壁部は相対的に肉厚が薄くなるので、パイプの軽量化を図ることができる。このように、パイプの端部の強度を確保することができると共に、パイプの軽量化を図ることができる。   In this pipe processing method, the end portion of the pipe is bent toward the inside in the radial direction of the pipe by the first roller, and then bent by the second roller until the end portion is in close contact with the inner surface of the pipe. Thereby, since the wall part and end part of a pipe overlap and are integrated, the predetermined | prescribed thickness which can endure welding at the edge part of a pipe is securable. On the other hand, since the wall portions other than the end portions are relatively thin, the weight of the pipe can be reduced. Thus, the strength of the end of the pipe can be ensured and the weight of the pipe can be reduced.

また、端部分をパイプの内面に密着させた状態で第３のローラーによってパイプの端部にしごきを加えることが好ましい。この場合には、パイプの端部にしごきを加えることによって端部の密度が高くなり、パイプ端部の強度の向上を図ることができる。また、しごきを加えることで、端部の肉厚を調整することが可能となる。   Further, it is preferable to iron the end portion of the pipe with the third roller in a state where the end portion is in close contact with the inner surface of the pipe. In this case, by adding iron to the end portion of the pipe, the density of the end portion is increased, and the strength of the end portion of the pipe can be improved. Moreover, it becomes possible to adjust the wall thickness of an edge part by adding ironing.

本発明によれば、パイプの端部の強度を確保することができると共に、パイプの軽量化を図ることができる。   ADVANTAGE OF THE INVENTION According to this invention, while being able to ensure the intensity | strength of the edge part of a pipe, weight reduction of a pipe can be achieved.

本発明に係るパイプ加工方法の一実施形態によって加工されたパイプの縦断面図である。It is a longitudinal cross-sectional view of the pipe processed by one Embodiment of the pipe processing method which concerns on this invention. 図１のパイプを加工する際におけるセッティング工程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the setting process at the time of processing the pipe of FIG. 図１のパイプを加工する際における縁折工程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the edge folding process at the time of processing the pipe of FIG. 図１のパイプを加工する際における予備曲げ工程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pre-bending process at the time of processing the pipe of FIG. 図１のパイプを加工する際における本曲げ工程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the main bending process in processing the pipe of FIG. 図１のパイプを加工する際におけるしごき工程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the ironing process in processing the pipe of FIG.

以下、本発明に係るパイプ加工方法の実施形態について、図を参照しながら説明する。図１は、本発明に係るパイプ加工方法の一実施形態によって加工されたパイプの縦断面図である。図１に示されるように、パイプ１は、例えばステンレスからなり、肉厚ｄ１が例えば０．８ｍｍのものである。このパイプ１の端部２は、他の部分の壁部３よりも０．４ｍｍ（ｄ２）程度厚く形成されており、その肉厚ｄ３は１．２ｍｍとなっている。また、端部２の長さ寸法Ｌは、２０ｍｍとなっている。このように加工されたパイプ１は、例えば自動車の排気管などに用いられる。なお、このパイプ加工方法では、パイプ１の直径φが３０〜１００ｍｍまで対応することができる。   Hereinafter, an embodiment of a pipe processing method according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a pipe machined by an embodiment of a pipe machining method according to the present invention. As shown in FIG. 1, the pipe 1 is made of, for example, stainless steel and has a thickness d1 of, for example, 0.8 mm. The end 2 of the pipe 1 is formed about 0.4 mm (d2) thicker than the wall 3 of the other part, and the wall thickness d3 is 1.2 mm. The length dimension L of the end 2 is 20 mm. The pipe 1 processed in this way is used for an exhaust pipe of an automobile, for example. In this pipe processing method, the diameter φ of the pipe 1 can correspond to 30 to 100 mm.

次に、上述したパイプ１の加工方法について、図２〜図６を参照しながら説明する。   Next, the processing method of the pipe 1 mentioned above is demonstrated, referring FIGS.

まず、図２に示されるように、加工対象（素材）となるパイプ１を、外径サポートリング４に取り付ける（セッティング工程）。外径サポートリング４は、パイプ１の外径をサポートする（外径の変形を防止する）ための焼入れ金型である。パイプ１は、折り曲げられる端部分１ａの長さ寸法分、すなわち強度を確保したい長さ寸法分だけ、外径サポートリング４の端部４ａよりも突出するように、外径サポートリング４に取り付けられる。   First, as shown in FIG. 2, the pipe 1 to be processed (material) is attached to the outer diameter support ring 4 (setting step). The outer diameter support ring 4 is a quenching mold for supporting the outer diameter of the pipe 1 (preventing deformation of the outer diameter). The pipe 1 is attached to the outer diameter support ring 4 so as to protrude from the end portion 4a of the outer diameter support ring 4 by the length dimension of the end portion 1a to be bent, that is, the length dimension to ensure strength. .

続いて、図３に示されるように、パイプ１を中心軸Ａを中心に回転させながら、スピニングマシン５に取り付けられたローラー（第１のローラー）６をパイプ１の端部分１ａの外周面に当接させてティーチングし、絞りスピニングによってパイプ１の端部分１ａをパイプ１の径方向内側（中心軸Ａ側）に向けて折り曲げる（縁折工程）。使用するローラー６は、標準ローラーであり、例えばパイプ１と当接する当接部６ａの曲率半径Ｒが８ｍｍ、直径φが１５８ｍｍとなっている。なお、パイプ１の回転数Ｓは６００ｒｐｍ、ローラー６の移動速さＦは１０００ｍｍ／分に設定されている。   Subsequently, as shown in FIG. 3, the roller (first roller) 6 attached to the spinning machine 5 is placed on the outer peripheral surface of the end portion 1 a of the pipe 1 while rotating the pipe 1 around the central axis A. Teaching is performed by contact, and the end portion 1a of the pipe 1 is bent toward the radially inner side (center axis A side) of the pipe 1 by drawing spinning (edge folding step). The roller 6 to be used is a standard roller. For example, the radius of curvature R of the abutting portion 6a that abuts the pipe 1 is 8 mm, and the diameter φ is 158 mm. In addition, the rotation speed S of the pipe 1 is set to 600 rpm, and the moving speed F of the roller 6 is set to 1000 mm / min.

続いて、図４に示されるように、パイプ１を回転させながら、スピニングマシン５に取り付けられたローラー（第１のローラー）７を折り曲げられたパイプ１の端部分１ａに当接させ、この端部分１ａが壁部３に対して約４５°の傾きとなるように予備曲げをする（予備曲げ工程）。使用するローラー７は、円柱状を成し、例えば全長が３２ｍｍ、先端部７ａの直径φが２６ｍｍ、基端部７ｂの直径φが３１ｍｍとなっている。なお、パイプ１の回転数Ｓは４００ｒｐｍ、ローラー７の移動速さＦは２００ｍｍ／分に設定されている。   Subsequently, as shown in FIG. 4, while rotating the pipe 1, a roller (first roller) 7 attached to the spinning machine 5 is brought into contact with the bent end portion 1 a of the pipe 1, and this end Pre-bending is performed so that the portion 1a is inclined at about 45 ° with respect to the wall 3 (pre-bending step). The roller 7 to be used has a columnar shape. For example, the total length is 32 mm, the diameter φ of the distal end portion 7 a is 26 mm, and the diameter φ of the proximal end portion 7 b is 31 mm. In addition, the rotation speed S of the pipe 1 is set to 400 rpm, and the moving speed F of the roller 7 is set to 200 mm / min.

続いて、図５に示されるように、パイプ１を回転させながら、スピニングマシン５に取り付けられたローラー（第２のローラー）８を傾いた端部分１ａに当接させ、この端部分１ａの内面がパイプ１の壁部３の内面３ａに面接（密着）するように、パイプ１の端部分１ａの本曲げをする（本曲げ工程）。使用するローラー８は、円柱状を成し、直径φが３５ｍｍとなっている。なお、パイプ１の回転数Ｓは４００ｒｐｍ、ローラー８の移動速さＦは２００ｍｍ／分に設定されている。   Subsequently, as shown in FIG. 5, while rotating the pipe 1, a roller (second roller) 8 attached to the spinning machine 5 is brought into contact with the inclined end portion 1a, and the inner surface of the end portion 1a Is bent (end bending process) so that the end portion 1a of the pipe 1 is in contact with (in close contact with) the inner surface 3a of the wall portion 3 of the pipe 1. The roller 8 to be used has a cylindrical shape and a diameter φ of 35 mm. In addition, the rotation speed S of the pipe 1 is set to 400 rpm, and the moving speed F of the roller 8 is set to 200 mm / min.

続いて、図６に示されるように、パイプ１を回転させながら、スピニングマシン５に取り付けられたローラー（第３のローラー）９をパイプ１の内面３ａに重なった端部分１ａに沿って当接させ、しごきスピニングによってパイプ１の端部分１ａにしごきを加える（しごき工程）。具体的には、ローラー９を端部分１ａに当接させた状態で３往復することにより、パイプ１の端部分１ａにしごきを加える。これにより、図１に示されるように、パイプ１の端部分１ａの肉厚ｄ２が４ｍｍ程度になる共に、パイプ１の端部分１ａと壁部３とが重なりあった状態で一体化されて端部２が成形される。ローラー９は、先端部９ａの曲率半径Ｒが３ｍｍ、直径φが２８ｍｍとなっており、本体部９ｂの直径φが２６ｍｍとなっている。なお、パイプ１の回転数Ｓは６００ｒｐｍ、ローラー９の移動速さＦは１００ｍｍ／分に設定されている。   Subsequently, as shown in FIG. 6, while rotating the pipe 1, the roller (third roller) 9 attached to the spinning machine 5 is brought into contact with the end portion 1 a overlapping the inner surface 3 a of the pipe 1. Then, ironing is applied to the end portion 1a of the pipe 1 by ironing spinning (ironing process). Specifically, iron 6 is applied to the end portion 1a of the pipe 1 by reciprocating three times while the roller 9 is in contact with the end portion 1a. As a result, as shown in FIG. 1, the thickness d2 of the end portion 1a of the pipe 1 is about 4 mm, and the end portion 1a of the pipe 1 and the wall portion 3 are integrated in an overlapped state. Part 2 is molded. The roller 9 has a radius of curvature R of the tip portion 9a of 3 mm, a diameter φ of 28 mm, and a diameter φ of the main body portion 9b of 26 mm. In addition, the rotation speed S of the pipe 1 is set to 600 rpm, and the moving speed F of the roller 9 is set to 100 mm / min.

その後、パイプ１を外径サポートリング４から取り外すことで、図１に示されるパイプ１が得られる。   Then, the pipe 1 shown in FIG. 1 is obtained by removing the pipe 1 from the outer diameter support ring 4.

以上説明したように、パイプ１を成形するためのパイプ加工方法においては、ローラー６，７によってパイプ１の端部分１ａをパイプ１の径方向内側に向けて曲げた後、ローラー８によってその端部分１がパイプ１の内面３ａに密着するまで折り曲げる。これにより、パイプ１の壁部３と端部分１ａとが重なり一体化されるので、パイプ１の端部１ａにおいて例えば溶接に耐え得る所定の肉厚を確保することができる。その一方で、端部１ａ以外の壁部３は相対的に肉厚が薄くなるので、パイプ１の軽量化を図ることができる。このように、パイプ１の端部１ａの強度を確保することができると共に、パイプ１の軽量化を図ることができる。   As described above, in the pipe processing method for forming the pipe 1, the end portions 1 a of the pipe 1 are bent toward the inside in the radial direction of the pipe 1 by the rollers 6 and 7, and then the end portions of the pipe 1 are formed by the roller 8. Bend until 1 is in close contact with the inner surface 3 a of the pipe 1. Thereby, since the wall part 3 and the end part 1a of the pipe 1 overlap and are integrated, it is possible to secure a predetermined thickness that can withstand, for example, welding at the end part 1a of the pipe 1. On the other hand, since the wall portions 3 other than the end portion 1a are relatively thin, the weight of the pipe 1 can be reduced. Thus, the strength of the end 1a of the pipe 1 can be ensured and the weight of the pipe 1 can be reduced.

また、端部分１ａをパイプ１の内面３ａに密着させた状態でローラー９によって端部２（端部分１ａ）にしごきを加えるので、端部２の密度が高くなり、パイプ１の端部２の強度の向上を図ることができる。また、端部１ａにしごきを加えることで、端部分１ａの肉厚を薄くすることができ、端部２の肉厚を調整することが可能となる。   Further, since the end portion 1a is in close contact with the inner surface 3a of the pipe 1 and the end portion 2 (end portion 1a) is ironed by the roller 9, the density of the end portion 2 is increased, and the end portion 2 of the pipe 1 is increased. The strength can be improved. Further, by adding ironing to the end portion 1a, the thickness of the end portion 1a can be reduced, and the thickness of the end portion 2 can be adjusted.

また、パイプ１の肉厚を厚くしなくてすむため、従来の肉厚の厚いパイプに比べてコストの削減を図ることができる。   Moreover, since it is not necessary to increase the thickness of the pipe 1, the cost can be reduced as compared with the conventional thick pipe.

また、端部２以外の加工を施さない部分は、応力が加えられないため、加工硬化が生じないといった効果もある。   In addition, since stress is not applied to the portions other than the end portion 2 that are not subjected to processing, there is an effect that work hardening does not occur.

本発明は、上述した実施形態に限定されるものではない。   The present invention is not limited to the embodiment described above.

例えば、上記実施形態では、スピニング加工を施すためにローラー６〜９を用いたが、他のローラーを用いてもよい。また、同一のローラーによって加工を施してもよい。   For example, in the said embodiment, although the rollers 6-9 were used in order to give a spinning process, you may use another roller. Moreover, you may process with the same roller.

また、上記実施形態では、ステンレスから成るパイプ１を用いたが、加工可能なパイプ１の材料はステンレスに限定されず、例えばアルミニウム、鉄、チタン等であってもよい。   Moreover, in the said embodiment, although the pipe 1 which consists of stainless steel was used, the material of the pipe 1 which can be processed is not limited to stainless steel, For example, aluminum, iron, titanium, etc. may be sufficient.

１…パイプ、１ａ…端部分、３ａ…内面、６〜９…ローラー（第１のローラー、第２のローラー、第３のローラー）。   DESCRIPTION OF SYMBOLS 1 ... Pipe, 1a ... End part, 3a ... Inner surface, 6-9 ... Roller (1st roller, 2nd roller, 3rd roller).

Claims (2)

パイプをスピニング加工により成形するパイプ加工方法であって、
前記パイプを回転させると共に、当該パイプの端部分に第１のローラーを押し当てて前記端部分を前記パイプの径方向内側に向けて曲げた後、第２のローラーによって前記端部分を前記パイプの内面に密着させることを特徴とするパイプ加工方法。 A pipe processing method for forming a pipe by spinning,
The pipe is rotated, and a first roller is pressed against the end portion of the pipe to bend the end portion inward in the radial direction of the pipe. A pipe processing method characterized by being in close contact with an inner surface. 前記端部分を前記パイプの内面に密着させた状態で第３のローラーによって前記パイプの端部にしごきを加えることを特徴とする請求項１記載のパイプ加工方法。   The pipe processing method according to claim 1, wherein iron is applied to the end of the pipe by a third roller in a state where the end portion is in close contact with the inner surface of the pipe.
JP2009085095A 2009-03-31 2009-03-31 Method of working pipe Pending JP2010234406A (en)

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Cited By (5)

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WO2018181401A1 (en) * 2017-03-30 2018-10-04 新日鐵住金ステンレス株式会社 Ferritic stainless steel pipe having excellent salt tolerance in gap, pipe-end-thickened structure, welding joint, and welded structure
JP2018168460A (en) * 2017-03-30 2018-11-01 新日鐵住金ステンレス株式会社 Ferritic stainless steel pipe and ferritic stainless steel pipe for automotive exhaust system parts
CN109985954A (en) * 2019-04-17 2019-07-09 华南理工大学 A kind of strong revolving shaping method of heat preparing magnesium alloy Power spinning
JP2020050929A (en) * 2018-09-28 2020-04-02 日鉄ステンレス株式会社 Ferritic stainless steel sheet, ferritic stainless steel pipe, pipe end thickening structure, and weldment structure
KR20230018931A (en) * 2021-07-30 2023-02-07 주식회사 정운 Headrest stay processing method

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WO2018181401A1 (en) * 2017-03-30 2018-10-04 新日鐵住金ステンレス株式会社 Ferritic stainless steel pipe having excellent salt tolerance in gap, pipe-end-thickened structure, welding joint, and welded structure
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CN110446799A (en) * 2017-03-30 2019-11-12 日铁不锈钢株式会社 The excellent ferrite-group stainless steel pipe of the resistance to salt damage of clearance portion, pipe end thicken structural body, welding point and welding structural body
JPWO2018181401A1 (en) * 2017-03-30 2020-03-26 日鉄ステンレス株式会社 Ferritic stainless steel pipe, pipe end thickened structure, welded joint, and welded structure with excellent salt damage resistance in gaps
KR102272169B1 (en) 2017-03-30 2021-07-05 닛테츠 스테인레스 가부시키가이샤 Ferritic stainless steel pipe with excellent salt decomposition resistance in gaps, pipe end thickness increase structure, welded joint, and welded structure
US11215299B2 (en) 2017-03-30 2022-01-04 Nippon Steel Stainless Steel Corporation Ferritic stainless steel pipe having excellent salt tolerance in gap, pipe-end-thickened structure, welding joint, and welded structure
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JP7296705B2 (en) 2018-09-28 2023-06-23 日鉄ステンレス株式会社 Ferritic stainless steel pipe, pipe end thickened structure and welded structure
CN109985954A (en) * 2019-04-17 2019-07-09 华南理工大学 A kind of strong revolving shaping method of heat preparing magnesium alloy Power spinning
KR20230018931A (en) * 2021-07-30 2023-02-07 주식회사 정운 Headrest stay processing method
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