JPH1128525A - Method for working end part of tube - Google Patents
Method for working end part of tubeInfo
- Publication number
- JPH1128525A JPH1128525A JP19798797A JP19798797A JPH1128525A JP H1128525 A JPH1128525 A JP H1128525A JP 19798797 A JP19798797 A JP 19798797A JP 19798797 A JP19798797 A JP 19798797A JP H1128525 A JPH1128525 A JP H1128525A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- cylindrical portion
- pipe
- cylindrical
- eccentric
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 11
- 230000000052 comparative effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は管端部の加工方法に関す
る。詳しくは管の端部に、管の径より大きい円筒部をも
ち、円筒部が偏心し、円筒部と未加工部にテーパーを有
している管の加工方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a pipe end. More specifically, the present invention relates to a method for processing a pipe having a cylindrical portion at the end of the pipe, the cylindrical portion being larger than the diameter of the pipe, the cylindrical portion being eccentric, and the cylindrical portion and the unprocessed portion being tapered.
【０００２】[0002]
【従来の技術】管の端部に、管の径より大きい円筒部を
もち、円筒部が大きく偏心し、円筒部と未加工部にテー
パーを有している管はこれまでバルジ成形、ないし外径
の異なる２種の管の管端を、一方は口絞り加工、一方は
口広げ加工し接合する等により作られていた。2. Description of the Related Art Pipes having a cylindrical portion at the end of the tube which is larger than the diameter of the tube, the cylindrical portion being largely eccentric, and having a tapered portion between the cylindrical portion and the unprocessed portion are conventionally formed by bulge forming or external forming. The pipe ends of two kinds of pipes having different diameters were produced by drawing one at a mouth and one at a mouth widening and joining.
【０００３】[0003]
【発明が解決しようとする課題】管の端部に、管の径よ
り大きい円筒部をもち、円筒部が偏心し、円筒部と未加
工部にテーパーを有している管をポンチで加工する場合
最も問題となるのは、管の座屈である。円筒部ををもた
ない管端部の偏心口広げ加工でも、偏心荷重が加わり偏
心していない通常の口広げ加工に較べ座屈しやすいた
め、工程数が多くなる。バルジ成形や、外径の異なる２
種の管を加工後接合する場合も時間がかかる、工程数が
多くなる等の問題がある。At the end of the pipe, a pipe having a cylindrical section larger than the diameter of the pipe, the cylinder section being eccentric, and the cylindrical section and the unprocessed section being tapered is machined with a punch. The worst case is buckling of the tube. Even in the eccentric widening process of the pipe end portion having no cylindrical portion, the eccentric load is applied and the eccentric widening process is easy to buckle as compared with the normal non-eccentric widening process. Bulge molding and 2 with different outer diameter
It takes a long time to join the pipes after processing them after processing, and there are problems such as an increase in the number of steps.
【０００４】[0004]
【課題を解決するための手段】本発明は上述の課題を解
決するために発明されたもので、その特徴は円筒部の外
径をｄ、円筒部の軸心と管の軸心のずれを偏心量δとし
た時、円筒部になる部分に近接した管の部分を金型で保
持し、管と同軸で（ｄ−２δ）ｍｍの外径まで加工し、
しかる後に、円筒部になる部分に片側は線で当接し、片
側は空間を有し、テーパー部は当接する金型を配置後外
径ｄｍｍまで加工し、偏心量と管の外径の比が０．１以
上の偏心した形状を得ることにある。以下に詳細に説明
する。DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its features are that the outer diameter of the cylindrical portion is d, and the difference between the axial center of the cylindrical portion and the axial center of the tube is. When the amount of eccentricity is δ, the portion of the tube close to the portion that becomes the cylindrical portion is held by a mold, and coaxially processed with the tube to an outer diameter of (d−2δ) mm,
After that, one side abuts on the part to be the cylindrical part with a line, one side has a space, and the tapered part is processed to the outer diameter dmm after arranging the contacting die, and the ratio of the eccentricity and the outer diameter of the pipe is The purpose is to obtain an eccentric shape of 0.1 or more. This will be described in detail below.
【０００５】図１に管と同軸で（ｄ−２δ）ｍｍの外径
まで加工する時の方法を示す。直管１を型２、２’によ
ってクランプする。型２、２’は円筒を分割した内面を
形成しているため、直管１を固定できる。ポンチ３を直
管１と同軸で直管１に挿入し、円筒部４を形成する。こ
れにより、直管１の外径より大きい円筒部４を持つ管が
形成される。この（ｄ−２δ）ｍｍの外径まで加工する
時、テーパー部６で座屈する場合は、加工後の外径に見
合う金型を配置し加工を行うことにより、座屈を防止で
きる。FIG. 1 shows a method for processing to an outer diameter of (d-2δ) mm coaxially with the pipe. The straight pipe 1 is clamped by the molds 2, 2 '. Since the molds 2 and 2 ′ form an inner surface obtained by dividing the cylinder, the straight pipe 1 can be fixed. The punch 3 is inserted into the straight pipe 1 coaxially with the straight pipe 1 to form the cylindrical portion 4. Thus, a tube having a cylindrical portion 4 larger than the outer diameter of the straight tube 1 is formed. When buckling occurs at the tapered portion 6 when processing to an outer diameter of (d−2δ) mm, buckling can be prevented by arranging a die corresponding to the outer diameter after processing and performing the processing.
【０００６】この円筒部４を持つ管の偏心加工方法を第
２図に示す。円筒部４を持つ管５のテーパー部６の近傍
を型２、２’によってクランプする。このクランプによ
り円筒部を持つ管５は前述の如く固定できる。円筒部４
の周囲には型７、および型８をセットする。型７と型８
は先端に長さの異なるテーパーを有した円筒を分割した
内面を形成している。管の円筒部４は型７と線で当接
し、型８との間には空間を有し、円筒部４のテーパーは
型７および８のテーパーと当接する。ポンチ９を挿入す
ることにより、座屈が発生することなく、第３図に示す
管の端部に、管の径より大きい円筒部をもち、円筒部が
偏心し、円筒部と未加工部の間にテーパーを有している
管が得られる。FIG. 2 shows a method of eccentrically processing a pipe having the cylindrical portion 4. The vicinity of the tapered portion 6 of the tube 5 having the cylindrical portion 4 is clamped by the molds 2 and 2 '. The tube 5 having the cylindrical portion can be fixed by the clamp as described above. Cylindrical part 4
A mold 7 and a mold 8 are set around. Type 7 and Type 8
Has an inner surface formed by dividing a cylinder having a taper with a different length at the tip. The cylindrical part 4 of the tube abuts the mold 7 in a line and has a space between the mold 8 and the taper of the cylindrical part 4 abuts the taper of the molds 7 and 8. By inserting the punch 9, without buckling, the end of the tube shown in FIG. 3 has a cylindrical portion larger than the diameter of the tube, the cylindrical portion is eccentric, and the cylindrical portion and the unprocessed portion A tube with a taper in between is obtained.
【０００７】[0007]
【作用】直管１の端部に管の径より大きい円筒部を有す
る管の成形において、型２、２’によって管をクランプ
し、管の座屈を防止する事は通常行われているが、偏心
加工では、偏心荷重がかかるためより座屈しやすい。本
発明の要点は、偏心加工時、管の片側、およびテーパー
部に金型を当接させて加工し、座屈を防止することにあ
る。本加工方法において、円筒部の外径をｄ、円筒部の
軸心と管の軸心のずれを偏心量δとした時、第一工程で
管と同軸で（ｄ−２δ）ｍｍの外径まで加工するのは、
管の片側を当接させるためである。これとテーパー部に
金型を当接させることにより、座屈を発生させることな
く偏心加工を行うことができる。偏心量と管の外径の比
が０．１より小さい偏心した形状を得ることも可能であ
るが、工程数を少なくする経済的メリットがないため、
偏心量と管の外径の比は０．１以上に限定する。In the formation of a tube having a cylindrical portion larger than the diameter of the tube at the end of the straight tube 1, it is common practice to clamp the tube with the dies 2, 2 'to prevent the tube from buckling. In eccentric machining, eccentric load is applied, so that buckling is more likely. The gist of the present invention is to prevent buckling by performing processing by bringing a mold into contact with one side of a pipe and a tapered portion during eccentric processing. In this processing method, when the outer diameter of the cylindrical portion is d and the deviation between the axis of the cylindrical portion and the axis of the tube is eccentricity δ, the outer diameter of (d−2δ) mm is coaxial with the tube in the first step. Processing up to
This is for bringing one side of the tube into contact. By bringing the mold into contact with the tapered portion, eccentric processing can be performed without causing buckling. Although it is possible to obtain an eccentric shape in which the ratio of the eccentricity to the outer diameter of the pipe is smaller than 0.1, there is no economic merit of reducing the number of steps,
The ratio between the amount of eccentricity and the outer diameter of the tube is limited to 0.1 or more.
【０００８】[0008]
【発明の実施の形態】ＳＴＫＭ１１Ａ、外径２５．４ｍ
ｍ×肉厚１．０ｍｍの鋼管の管端を外径３５ｍｍの円筒
まで加工した後、３ｍｍないし５ｍｍの偏心加工を行っ
た。本発明の実施例、比較例を表１に示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS STKM11A, outer diameter 25.4 m
After processing the end of a steel pipe having a mx wall thickness of 1.0 mm into a cylinder having an outer diameter of 35 mm, eccentric processing of 3 mm to 5 mm was performed. Table 1 shows examples of the present invention and comparative examples.
【０００９】[0009]
【表１】 [Table 1]
【００１０】本発明の型７の内面と管の円筒部４が当接
し、型８の内面と円筒部４とは空間を有し、型７、８の
テーパーと、管のテーパーは当接させるにより、座屈が
発生することなく加工できた。The inner surface of the mold 7 of the present invention is in contact with the cylindrical portion 4 of the tube, the inner surface of the mold 8 and the cylindrical portion 4 have a space, and the taper of the molds 7 and 8 is in contact with the taper of the tube. As a result, it was possible to process without buckling.
【００１１】一方、比較例１に示す型７と型８がない場
合は管のテーパー部で座屈が発生した。また型７、８の
テーパーと、管のテーパーの間に空間がある比較例２の
場合、型７と円筒部４が当接していても、管のテーパー
部で座屈が発生した。On the other hand, when the molds 7 and 8 shown in Comparative Example 1 were not provided, buckling occurred at the tapered portion of the pipe. In the case of Comparative Example 2 in which there is a space between the taper of the dies 7 and 8 and the taper of the pipe, buckling occurred at the tapered part of the pipe even when the die 7 and the cylindrical part 4 were in contact with each other.
【００１２】図４には、本発明の他の実施例を示す。偏
心加工を行った管を再度偏心加工を行うことにより、座
屈が発生することなく加工できた。FIG. 4 shows another embodiment of the present invention. By performing the eccentricity processing again on the eccentrically processed pipe, the pipe could be processed without buckling.
【００１３】[0013]
【発明の効果】本発明により、管の端部に、管の径より
大きい円筒部をもち、円筒部が偏心し、円筒部と未加工
部にテーパーを有している管を、座屈が発生することな
く加工できる。According to the present invention, a tube having a cylindrical portion at the end of the tube having a diameter larger than the diameter of the tube, the cylindrical portion is eccentric, and the cylindrical portion and the unprocessed portion have a taper can be buckled. It can be processed without generating.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 管と同軸に円筒部を（ｄ−２δ）ｍｍの外径
まで加工した状態を表した断面図、FIG. 1 is a cross-sectional view showing a state in which a cylindrical portion is machined coaxially with a tube to an outer diameter of (d−2δ) mm.
【図２】 円筒部を持つ管の偏心加工状態を示す断面
図。FIG. 2 is a sectional view showing an eccentric processing state of a pipe having a cylindrical portion.
【図３】 本発明による、管の端部に、管の径より大き
い円筒部をもち、円筒部が偏心し、円筒部と未加工部に
テーパーを有している管を示す断面図。図中のδは偏心
した円筒部の軸心と管の軸心のずれ（偏心量）を表す。FIG. 3 is a cross-sectional view of a tube according to the present invention having a cylindrical portion at the end of the tube larger than the diameter of the tube, wherein the cylindrical portion is eccentric and the cylindrical portion and the unprocessed portion are tapered. In the figure, δ represents a deviation (amount of eccentricity) between the axis of the eccentric cylindrical portion and the axis of the pipe.
【図４】 本発明による、管の端部に、管の径より大き
い円筒部をもち、円筒部が２段階で偏心し、円筒部と未
加工部にテーパーを有している管を示す断面図。FIG. 4 shows a cross section of a tube according to the invention having a tube at the end of the tube with a diameter larger than the diameter of the tube, the cylinder being eccentric in two stages and having a taper in the cylinder and in the unprocessed part. FIG.
１ ：直管 ２、２’：型 ３ ：ポンチ ４ ：円筒部 ５ ：円筒部をもつ管 ６ ：管のテーパ
ー部 ７、８：型 ９ ：ポンチ1: straight pipe 2, 2 ': mold 3: punch 4: cylindrical part 5: pipe with cylindrical part 6: tapered part of pipe 7, 8: die 9: punch
Claims (1)
もち、円筒部が偏心し、円筒部と未加工部にテーパーを
有している管の加工方法であって、円筒部の外径をｄ、
円筒部の軸心と管の軸心のずれを偏心量δとしたとき、
円筒部になる部分に近接した管の部分を金型で保持し、
管と同軸で（ｄ−２δ）ｍｍの外径まで加工し、しかる
後に、円筒部になる部分に片側は線で当接し、片側は空
間を有し、テーパー部は当接する金型を配置後、外径ｄ
ｍｍまで加工し、偏心量と管の外径の比が０．１以上の
偏心した形状を得ることを特徴とする、管の端部に、管
の径より大きい円筒部をもち、円筒部が偏心し、円筒部
と未加工部にテーパーを有している管端部の加工方法。1. A method for processing a tube having a cylindrical portion at an end of the tube, the cylindrical portion being larger than the diameter of the tube, the cylindrical portion being eccentric, and the cylindrical portion and the unprocessed portion being tapered. Is the outer diameter of d,
When the deviation between the axis of the cylindrical part and the axis of the pipe is the amount of eccentricity δ,
Hold the part of the tube close to the part that becomes the cylindrical part with a mold,
After processing to the outer diameter of (d-2δ) mm coaxially with the pipe, one side abuts with a line on one side with a line, one side has a space, and the tapered part abuts a mold that abuts on the part that becomes the cylindrical part. , Outer diameter d
mm, the ratio of the eccentricity to the outer diameter of the tube is obtained to be eccentric with a ratio of 0.1 or more. At the end of the tube, a cylindrical portion larger than the diameter of the tube is provided. A method of processing a pipe end that is eccentric and has tapered cylindrical and unprocessed portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798797A JP3938979B2 (en) | 1997-07-09 | 1997-07-09 | Pipe end processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798797A JP3938979B2 (en) | 1997-07-09 | 1997-07-09 | Pipe end processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1128525A true JPH1128525A (en) | 1999-02-02 |
| JP3938979B2 JP3938979B2 (en) | 2007-06-27 |
Family
ID=16383634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19798797A Expired - Lifetime JP3938979B2 (en) | 1997-07-09 | 1997-07-09 | Pipe end processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3938979B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002102959A (en) * | 2000-09-25 | 2002-04-09 | Nisshin Steel Co Ltd | Manufacturing method for metal pipe having eccentric expanded diameter pipe end |
| JP2009028757A (en) * | 2007-07-27 | 2009-02-12 | Futaba Industrial Co Ltd | Tube expansion method |
| JP2009131881A (en) * | 2007-11-30 | 2009-06-18 | Asteer Co Ltd | Manufacturing method for eccentric tube expansion |
-
1997
- 1997-07-09 JP JP19798797A patent/JP3938979B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002102959A (en) * | 2000-09-25 | 2002-04-09 | Nisshin Steel Co Ltd | Manufacturing method for metal pipe having eccentric expanded diameter pipe end |
| JP2009028757A (en) * | 2007-07-27 | 2009-02-12 | Futaba Industrial Co Ltd | Tube expansion method |
| JP2009131881A (en) * | 2007-11-30 | 2009-06-18 | Asteer Co Ltd | Manufacturing method for eccentric tube expansion |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3938979B2 (en) | 2007-06-27 |
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