JP4009261B2 - Pipe end structure and pipe end processing method - Google Patents

Pipe end structure and pipe end processing method Download PDF

Info

Publication number
JP4009261B2
JP4009261B2 JP2004065834A JP2004065834A JP4009261B2 JP 4009261 B2 JP4009261 B2 JP 4009261B2 JP 2004065834 A JP2004065834 A JP 2004065834A JP 2004065834 A JP2004065834 A JP 2004065834A JP 4009261 B2 JP4009261 B2 JP 4009261B2
Authority
JP
Japan
Prior art keywords
annular groove
pipe
diameter
forming
large diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2004065834A
Other languages
Japanese (ja)
Other versions
JP2005256869A (en
Inventor
好勝 福岡
宏紀 柴原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyowa Sangyo Co Ltd
Original Assignee
Kyowa Sangyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyowa Sangyo Co Ltd filed Critical Kyowa Sangyo Co Ltd
Priority to JP2004065834A priority Critical patent/JP4009261B2/en
Publication of JP2005256869A publication Critical patent/JP2005256869A/en
Application granted granted Critical
Publication of JP4009261B2 publication Critical patent/JP4009261B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Joints With Sleeves (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

本発明は、パイプの端部構造及びパイプの端部加工方法に関する。   The present invention relates to a pipe end structure and a pipe end processing method.

一般に、金属パイプを切断した場合、切断端面にはバリが出るので、このバリを除去するために面取りを行なう（例えば、特許文献１の図３（ｃ）参照）。   Generally, when a metal pipe is cut, burrs appear on the cut end face, and therefore chamfering is performed to remove the burrs (see, for example, FIG. 3C of Patent Document 1).

しかし、上述のパイプを用いて、図８に示すように、芯金ａと回転ダイスｋによってパイプｐ1 の端部ｅにシール材収納用の環状凹溝ｇを形成すると、面取りｃした部分にバリｂが生じ、このようなパイプ端部にシール材を嵌着する際、バリによってシール材が傷付くという欠点があった。
特開２００２−３０１６１７ However, as shown in FIG. 8, when the annular concave groove g for accommodating the sealing material is formed in the end portion e of the pipe p 1 by the core metal a and the rotary die k, as shown in FIG. The burr b is generated, and when the sealing material is fitted to such an end portion of the pipe, there is a drawback that the sealing material is damaged by the burr.
JP 2002-301617 A

解決しようとする課題は、シール材を嵌着するときに、バリによって、シール材が傷つく点である。   The problem to be solved is that when the sealing material is fitted, the sealing material is damaged by the burr.

そこで、本発明に係るパイプの端部構造は、基本円管部に連続形成されたラジアル壁部と、第１大径部と、環状凹溝形成壁部と、第２大径部と、アール部と、内鍔部と、が順次連続状に一体形成され、上記第１大径部の外周面、上記第２大径部の外周面、及び、上記内鍔部のアキシャル方向外端面が、鏡面状圧潰面であるとともに、上記アール部の外周面が、粗面状成形面である。また、本発明に係るパイプの端部加工方法は、パイプの端部に軸心方向所定長さの拡径部を形成する拡径工程と、該拡径部の先端をラジアル内方向へ折曲げて内鍔部を形成する折曲工程と、上記拡径部のアキシャル方向中間位置に環状凹溝を形成する環状凹溝形成工程と、を順次有し；上記環状凹溝形成工程は、段付部をもって小径部と大径部を有する芯金を、パイプの端部に挿入して、ラジアル方向から自転かつ公転自在に回転ダイスを押圧して、該回転ダイスと上記芯金の小径部にて、上記環状凹溝を形成する工程であり；該環状凹溝の形成中は、上記内鍔部のアキシャル方向外端面と上記芯金の段付部が圧接し、かつ、上記内鍔部の内周端縁部と上記芯金の小径部との間に逃げ用間隙部が形成されている方法である。   Therefore, the pipe end structure according to the present invention includes a radial wall portion continuously formed in the basic circular pipe portion, a first large diameter portion, an annular groove forming wall portion, a second large diameter portion, And the inner flange portion are sequentially integrally formed, and the outer peripheral surface of the first large diameter portion, the outer peripheral surface of the second large diameter portion, and the outer end surface in the axial direction of the inner flange portion, In addition to the mirror-like crushing surface, the outer peripheral surface of the rounded portion is a rough surface. The pipe end processing method according to the present invention includes a diameter expanding step of forming a diameter-enlarged portion having a predetermined length in the axial direction at the end of the pipe, and bending the tip of the diameter-enlarged portion radially inward. A bending step for forming the inner flange portion, and an annular groove forming step for forming an annular groove at an intermediate position in the axial direction of the enlarged diameter portion; the annular groove forming step is stepped Insert a cored bar having a small-diameter part and a large-diameter part into the end of the pipe and press the rotating die so that it can rotate and revolve from the radial direction. At the small diameter part of the rotating die and the cored bar, A step of forming the annular groove; during the formation of the annular groove, the outer end surface in the axial direction of the inner flange portion and the stepped portion of the core metal are in pressure contact with each other, In this method, a clearance gap is formed between the peripheral edge and the small diameter portion of the cored bar.

本発明のパイプの端部構造によれば、シール材を嵌着する際に、シール材を傷付けるのを防止することができる。また、本発明のパイプの端部加工方法によれば、バリを生じることなく、シール材収納用の環状凹溝を容易に形成することができる。   According to the pipe end structure of the present invention, it is possible to prevent the sealing material from being damaged when the sealing material is fitted. In addition, according to the pipe end portion processing method of the present invention, it is possible to easily form an annular groove for storing a sealing material without generating burrs.

図１は、本発明の実施の一形態の使用状態を示す。すなわち、本発明は、金属製雄側パイプＰm の端部構造に関するものであって、雌側パイプＰf との間をシールするシール材Ｓ（例えば、Ｏリング）を収納する環状凹溝３を有する。雄側パイプＰm と雌側パイプＰf は、留め金具Ｔにて連結され、相互に離脱するのを防止されている。パイプＰは、例えば、アルミニウム、銅、鉄、ステンレス、真鍮等から成る。 FIG. 1 shows a use state of an embodiment of the present invention. That is, the present invention relates to a end structure of the metallic male side pipe P m, annular groove 3 for accommodating the sealing member for sealing between the female pipe P f S (eg, O-ring) Have The male side pipe Pm and the female side pipe Pf are connected by a fastener T and are prevented from being separated from each other. The pipe P is made of, for example, aluminum, copper, iron, stainless steel, brass, or the like.

図２に示すように、パイプＰ（雄側パイプＰm ）の端部Ｅには、基本円管部Ｋに連続形成されたラジアル壁部４と、第１大径部１と、環状凹溝形成壁部５と、第２大径部２と、アール部６と、内鍔部７と、が順次連続状に一体形成されている。
第１大径部１の外周面１ａ、第２大径部２の外周面２ａ、及び、内鍔部７のアキシャル方向外端面７ａは、鏡面状圧潰面である。アール部６の外周面６ａは、粗面状成形面である。「粗面」とは、塑性加工前のパイプの表面粗さよりも粗い面のことをいう。 As shown in FIG. 2, at the end E of the pipe P (male side pipe P m ), a radial wall part 4 continuously formed in the basic circular pipe part K, the first large diameter part 1, and an annular groove The forming wall portion 5, the second large-diameter portion 2, the rounded portion 6, and the inner flange portion 7 are integrally formed sequentially in a continuous manner.
The outer peripheral surface 1a of the first large-diameter portion 1, the outer peripheral surface 2a of the second large-diameter portion 2, and the outer end surface 7a in the axial direction of the inner collar portion 7 are specular crushing surfaces. The outer peripheral surface 6a of the rounded portion 6 is a rough surface. “Rough surface” refers to a surface rougher than the surface roughness of the pipe before plastic working.

次に、図３〜図７に於て、パイプの端部加工方法について説明する。
すなわち、パイプの端部加工方法は、パイプＰの端部Ｅに軸心方向所定長さＬの拡径部８を形成する拡径工程（図３）と、拡径部８の先端９をラジアル内方向へ折曲げて内鍔部７を形成する折曲工程（図５・図６）と、拡径部８のアキシャル方向中間位置に環状凹溝３を形成する環状凹溝形成工程（図７）と、を順次有する。 Next, with reference to FIG. 3 to FIG. 7, a method for processing the end portion of the pipe will be described.
That is, the pipe end portion processing method includes a diameter expanding step (FIG. 3) for forming a diameter-enlarged portion 8 having a predetermined length L in the axial direction at the end E of the pipe P, and a radial end portion 9 of the diameter-enlarged portion 8. Bending step (FIGS. 5 and 6) for forming the inner flange portion 7 by bending inward, and annular groove forming step (FIG. 7) for forming the annular groove 3 at the axially intermediate position of the enlarged diameter portion 8. ) And sequentially.

具体的には、まず、図３に於て、拡径工程を説明する。すなわち、クランプＣにてパイプＰを掴持しつつ、パイプＰの端部Ｅに、基本円管部Ｋの内径寸法ｄより大きな外径寸法Ｄの大径部Ｘを有する第１ピン（拡径ピン）Ａ1 を挿入し、かつ、パイプＰの端部Ｅに第１パンチＢ1 を外嵌させて、パイプＰの端部Ｅを拡径する。
次に、図４に於て、整形工程を説明する。すなわち、クランプＣの段付部Ｃ1 と第２ピン（整形ピン）Ａ2 の段付部Ｈにて、基本円管部Ｋと拡径部８との間にラジアル壁部４を形成する。Ｂ2 は第２パンチを示す。 Specifically, first, the diameter expansion process will be described with reference to FIG. That is, while holding the pipe P by the clamp C, the first pin (expanded diameter) having an outer diameter D larger than the inner diameter d of the basic circular pipe portion K at the end E of the pipe P. The pin) A 1 is inserted, and the end E of the pipe P is expanded by fitting the first punch B 1 to the end E of the pipe P.
Next, the shaping process will be described with reference to FIG. That is, the radial wall portion 4 is formed between the basic circular tube portion K and the enlarged diameter portion 8 at the stepped portion C 1 of the clamp C and the stepped portion H of the second pin (shaping pin) A 2 . B 2 represents a second punch.

その後、図５・図６に於て、折曲工程を説明する。
まず、図５に示す初期折曲工程を行なう。すなわち、内周面Ｍにアール状曲面Ｍ3 を有する第３パンチ（初期折曲パンチ）Ｂ3 にて、拡径部８の先端９をラジアル内方向へ折曲げる。Ａ3 は第３ピンを示す。
次に、図６に示す最終折曲工程を行なう。内周面Ｎにアール状曲面Ｎ4 を有する第４パンチ（最終折曲パンチ）Ｂ4 にて、パイプＰの端部Ｅにアール部６を形成する。アール状曲面Ｎ4 の縦断面に於ける曲率半径ｒ4 は、第３パンチＢ3 （図５参照）のアール状曲面Ｍ3 の縦断面に於ける曲率半径ｒ3 よりも小さい。Ａ4 は第４ピンを示す。 Thereafter, the bending process will be described with reference to FIGS.
First, the initial bending process shown in FIG. 5 is performed. That is, the tip 9 of the enlarged diameter portion 8 is bent radially inward by a third punch (initial folding punch) B 3 having a rounded curved surface M 3 on the inner peripheral surface M. A 3 indicates the third pin.
Next, the final bending process shown in FIG. 6 is performed. The round portion 6 is formed at the end E of the pipe P by the fourth punch (final folding punch) B 4 having the rounded curved surface N 4 on the inner peripheral surface N. The radius of curvature r 4 in the longitudinal section of the rounded curved surface N 4 is smaller than the radius of curvature r 3 in the longitudinal section of the rounded curved surface M 3 of the third punch B 3 (see FIG. 5). A 4 indicates the fourth pin.

次に、図７に於て、環状凹溝形成工程を説明する。すなわち、段付部Ｇをもって小径部Ｆ1 と大径部Ｆ2 を有する芯金Ｆを、パイプＰの端部Ｅに挿入して、ラジアル方向から自転かつ公転自在に回転ダイスＱを押圧して、回転ダイスＱと芯金Ｆの小径部Ｆ1 にて、環状凹溝３を形成する。環状凹溝３の形成中は、内鍔部７のアキシャル方向外端面７ａと芯金Ｆの段付部Ｇが圧接し、かつ、内鍔部７の内周端縁部７ｂと芯金Ｆの小径部Ｆ1 との間に逃げ用間隙部Ｊが形成されている。 Next, referring to FIG. 7, the annular groove forming step will be described. That is, a cored bar F having a small-diameter part F 1 and a large-diameter part F 2 with a stepped part G is inserted into the end E of the pipe P, and the rotary die Q is pressed so as to rotate and revolve from the radial direction. The annular groove 3 is formed by the rotary die Q and the small diameter portion F 1 of the core metal F. During the formation of the annular groove 3, the axially outer end surface 7a of the inner flange portion 7 and the stepped portion G of the core metal F are in pressure contact, and the inner peripheral edge 7b of the inner flange portion 7 and the core metal F are in contact with each other. gap J for escape between the small-diameter portion F 1 is formed.

なお、本発明は、設計変更自在であって、例えば、工程数を増減させるも良い。一般に、工程数を増加させると、精度が高く、表面粗さの小さな製品が得られる。逆に、工程数を減少させると、製造に要する時間を短縮することができ、設備も少なくて済むという利点がある。   In the present invention, the design can be changed freely. For example, the number of steps may be increased or decreased. Generally, when the number of steps is increased, a product with high accuracy and small surface roughness can be obtained. Conversely, reducing the number of steps has the advantage that the time required for manufacturing can be shortened and the number of facilities can be reduced.

以上のように、本発明のパイプの端部構造は、基本円管部Ｋに連続形成されたラジアル壁部４と、第１大径部１と、環状凹溝形成壁部５と、第２大径部２と、アール部６と、内鍔部７と、が順次連続状に一体形成され、第１大径部１の外周面１ａ、第２大径部２の外周面２ａ、及び、内鍔部７のアキシャル方向外端面７ａが、鏡面状圧潰面であるとともに、アール部６の外周面６ａが、粗面状成形面であるので、シール材Ｓを傷付けることなく、シール材Ｓを嵌着することができる。
また、本発明のパイプの端部加工方法は、パイプＰの端部Ｅに軸心方向所定長さＬの拡径部８を形成する拡径工程と、拡径部８の先端９をラジアル内方向へ折曲げて内鍔部７を形成する折曲工程と、拡径部８のアキシャル方向中間位置に環状凹溝３を形成する環状凹溝形成工程と、を順次有し、環状凹溝形成工程は、段付部Ｇをもって小径部Ｆ1 と大径部Ｆ2 を有する芯金Ｆを、パイプＰの端部Ｅに挿入して、ラジアル方向から自転かつ公転自在に回転ダイスＱを押圧して、回転ダイスＱと芯金Ｆの小径部Ｆ1 にて、環状凹溝３を形成する工程であり、環状凹溝３の形成中は、内鍔部７のアキシャル方向外端面７ａと芯金Ｆの段付部Ｇが圧接し、かつ、内鍔部７の内周端縁部７ｂと芯金Ｆの小径部Ｆ1 との間に逃げ用間隙部Ｊが形成されているので、バリ（従来の図８のバリｂ参照）を生じることなく、シール材収納用の環状凹溝３を形成することができる。 As described above, the end structure of the pipe of the present invention has the radial wall portion 4 continuously formed in the basic circular pipe portion K, the first large diameter portion 1, the annular groove forming wall portion 5, the second The large-diameter portion 2, the rounded portion 6, and the inner flange portion 7 are integrally formed sequentially and continuously, the outer peripheral surface 1a of the first large-diameter portion 1, the outer peripheral surface 2a of the second large-diameter portion 2, and Since the axial direction outer end surface 7a of the inner flange portion 7 is a mirror-like crushing surface, and the outer peripheral surface 6a of the rounded portion 6 is a rough surface-shaped molding surface, the sealing material S is not damaged. Can be fitted.
Further, the pipe end portion processing method of the present invention includes a diameter expanding step of forming a diameter-enlarged portion 8 having a predetermined length L in the axial direction at the end E of the pipe P, and a tip 9 of the diameter-enlarged portion 8 in the radial direction. Bending step of forming the inner flange portion 7 by bending in the direction, and an annular groove forming step of forming the annular groove 3 at the intermediate position in the axial direction of the enlarged diameter portion 8 to form the annular groove In the process, a cored bar F having a small-diameter part F 1 and a large-diameter part F 2 with a stepped part G is inserted into the end E of the pipe P, and the rotary die Q is pressed freely and revolved from the radial direction. In this step, the annular groove 3 is formed by the rotary die Q and the small diameter portion F 1 of the core metal F. During the formation of the annular groove 3, the axially outer end face 7a of the inner collar portion 7 and the core metal are formed. and stepped portions G is pressed against the F, and the gap portion J for escape between the small-diameter portion F 1 of the inner peripheral edge portion 7b and the core F of the inner flange portion 7 is formed In, without causing burrs (see burrs b of the conventional FIG. 8), it is possible to form the annular groove 3 of the sealing material housing.

本発明の実施の一形態を示す断面正面図である。It is a sectional front view showing one embodiment of the present invention. 要部拡大断面正面図である。It is a principal part expanded sectional front view. 製造方法説明用断面正面図である。It is a section front view for manufacture method explanation. 製造方法説明用断面正面図である。It is a section front view for manufacture method explanation. 製造方法説明用断面正面図である。It is a section front view for manufacture method explanation. 製造方法説明用断面正面図である。It is a section front view for manufacture method explanation. 製造方法説明用断面正面図である。It is a section front view for manufacture method explanation. 従来例を示す要部拡大断面正面図である。It is a principal part expanded sectional front view which shows a prior art example.

符号の説明Explanation of symbols

１ 第１大径部
１ａ 外周面
２ 第２大径部
２ａ 外周面
３ 環状凹溝
４ ラジアル壁部
５ 環状凹溝形成壁部
６ アール部
６ａ 外周面
７ 内鍔部
７ａ アキシャル方向外端面
７ｂ 内周端縁部
８ 拡径部
９ 先端
Ｅ 端部
Ｆ 芯金
Ｆ1 小径部
Ｆ2 大径部
Ｇ 段付部
Ｊ 逃げ用間隙部
Ｋ 基本円管部
Ｐ パイプ
Ｑ 回転ダイス DESCRIPTION OF SYMBOLS 1 1st large diameter part 1a Outer peripheral surface 2 2nd large diameter part 2a Outer peripheral surface 3 Annular groove 4 Radial wall part 5 Annular groove forming wall part 6 Round part 6a Outer peripheral surface 7 Inner flange 7a Axial direction outer end surface 7b In Peripheral edge 8 Expanded diameter 9 Tip E End F Core metal F 1 Small diameter F 2 Large diameter G Stepped section J Escape gap K Basic circular pipe P Pipe Q Rotating die

Claims (2)

基本円管部（Ｋ）に連続形成されたラジアル壁部（４）と、第１大径部（１）と、環状凹溝形成壁部（５）と、第２大径部（２）と、アール部（６）と、内鍔部（７）と、が順次連続状に一体形成され、
上記第１大径部（１）の外周面（１ａ）、上記第２大径部（２）の外周面（２ａ）、及び、上記内鍔部（７）のアキシャル方向外端面（７ａ）が、鏡面状圧潰面であるとともに、上記アール部（６）の外周面（６ａ）が、粗面状成形面であることを特徴とするパイプの端部構造。 A radial wall portion (4) continuously formed on the basic circular pipe portion (K), a first large diameter portion (1), an annular groove forming wall portion (5), and a second large diameter portion (2) , The rounded portion (6) and the inner collar portion (7) are sequentially formed integrally in a continuous manner,
An outer peripheral surface (1a) of the first large diameter portion (1), an outer peripheral surface (2a) of the second large diameter portion (2), and an axial outer end surface (7a) of the inner flange portion (7). An end structure of a pipe, which is a mirror-like crushing surface and the outer peripheral surface (6a) of the rounded portion (6) is a rough surface forming surface. パイプ（Ｐ）の端部（Ｅ）に軸心方向所定長さ（Ｌ）の拡径部（８）を形成する拡径工程と、該拡径部（８）の先端（９）をラジアル内方向へ折曲げて内鍔部（７）を形成する折曲工程と、上記拡径部（８）のアキシャル方向中間位置に環状凹溝（３）を形成する環状凹溝形成工程と、を順次有し、
上記環状凹溝形成工程は、段付部（Ｇ）をもって小径部（Ｆ1 ）と大径部（Ｆ2 ）を有する芯金（Ｆ）を、パイプ（Ｐ）の端部（Ｅ）に挿入して、ラジアル方向から自転かつ公転自在に回転ダイス（Ｑ）を押圧して、該回転ダイス（Ｑ）と上記芯金（Ｆ）の小径部（Ｆ1 ）にて、上記環状凹溝（３）を形成する工程であり、
該環状凹溝（３）の形成中は、上記内鍔部（７）のアキシャル方向外端面（７ａ）と上記芯金（Ｆ）の段付部（Ｇ）が圧接し、かつ、上記内鍔部（７）の内周端縁部（７ｂ）と上記芯金（Ｆ）の小径部（Ｆ1 ）との間に逃げ用間隙部（Ｊ）が形成されていることを特徴とするパイプの端部加工方法。 A diameter expansion step of forming a diameter-enlarged portion (8) having a predetermined axial length (L) at the end (E) of the pipe (P), and a tip (9) of the diameter-expanded portion (8) in the radial direction Bending step of bending in the direction to form the inner flange portion (7), and an annular groove forming step of forming the annular groove (3) in the axially intermediate position of the expanded diameter portion (8) in sequence. Have
In the annular groove forming step, the cored bar (F) having the small diameter part (F 1 ) and the large diameter part (F 2 ) with the stepped part (G) is inserted into the end part (E) of the pipe (P). Then, the rotary die (Q) is pressed so as to rotate and revolve from the radial direction, and the annular groove (3) is formed between the rotary die (Q) and the small diameter portion (F 1 ) of the core metal (F). )
During the formation of the annular groove (3), the axially outer end surface (7a) of the inner flange portion (7) and the stepped portion (G) of the core metal (F) are in pressure contact with each other, A clearance gap (J) is formed between the inner peripheral edge (7b) of the portion (7) and the small diameter portion (F 1 ) of the core metal (F). Edge processing method.
JP2004065834A 2004-03-09 2004-03-09 Pipe end structure and pipe end processing method Expired - Fee Related JP4009261B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004065834A JP4009261B2 (en) 2004-03-09 2004-03-09 Pipe end structure and pipe end processing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004065834A JP4009261B2 (en) 2004-03-09 2004-03-09 Pipe end structure and pipe end processing method

Publications (2)

Publication Number Publication Date
JP2005256869A JP2005256869A (en) 2005-09-22
JP4009261B2 true JP4009261B2 (en) 2007-11-14

Family

ID=35082808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004065834A Expired - Fee Related JP4009261B2 (en) 2004-03-09 2004-03-09 Pipe end structure and pipe end processing method

Country Status (1)

Country Link
JP (1) JP4009261B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008256028A (en) * 2007-04-03 2008-10-23 Taiji Nakamoto Pipe and its manufacturing method
JP5767979B2 (en) * 2012-01-11 2015-08-26 日立アプライアンス株式会社 Fluid flow member
JP2013204741A (en) * 2012-03-29 2013-10-07 Nisshin Steel Co Ltd Stainless steel pipe joint

Also Published As

Publication number Publication date
JP2005256869A (en) 2005-09-22

Similar Documents

Publication Publication Date Title
JP5236491B2 (en) Nut, nut manufacturing method, and corresponding tool
JP4983053B2 (en) Mechanical expander and method for producing seamless steel pipe
JP4776791B2 (en) Double pipe end processing method
JP2006527092A5 (en)
JP4009261B2 (en) Pipe end structure and pipe end processing method
JP5012476B2 (en) Manufacturing method of refrigerant piping
JP4685055B2 (en) Pipe end diameter expansion jig
JP2007283351A (en) Plug for drawing tube, and tube manufacturing method using the same
JP6665643B2 (en) Manufacturing method and manufacturing apparatus for expanded pipe parts
JP5057865B2 (en) Piping and pipe end machining method
JP6356893B1 (en) Pipe joint structure
JP2606764B2 (en) Method of manufacturing male member used for connector
JP7087666B2 (en) Nipple and its manufacturing method
JP5212097B2 (en) Flange joint
JP2005349425A (en) Method of producing double pipe
JP2009243523A (en) Piping flange joint
JP2006263750A (en) Pipe manufacturing method
JP2006000873A (en) Method for joining metallic tube
JP4428621B2 (en) Incore
US11951531B2 (en) Method and device for producing a hose nipple
JP2006110567A (en) Partially thin-walled pipe manufacturing method
US20230311194A1 (en) Apparatus for producing branch structure in metal pipe, and method for producing branch structure in metal pipe
JP5061770B2 (en) Manufacturing method of pipe joint by pipe integrated processing
JP2009183983A (en) Method of bending electric resistance welded steel tube
JP6901134B2 (en) Pipe fitting structure

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070725

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070807

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070831

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100907

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4009261

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100907

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110907

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120907

Year of fee payment: 5

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120907

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130907

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees