JP2007105762A - Method for expanding end part of metallic tube - Google Patents
Method for expanding end part of metallic tube Download PDFInfo
- Publication number
- JP2007105762A JP2007105762A JP2005299269A JP2005299269A JP2007105762A JP 2007105762 A JP2007105762 A JP 2007105762A JP 2005299269 A JP2005299269 A JP 2005299269A JP 2005299269 A JP2005299269 A JP 2005299269A JP 2007105762 A JP2007105762 A JP 2007105762A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- pipe
- expansion
- expanding
- tool
- 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
Images
Abstract
Description
本発明は、金属管端部の拡管加工方法に関する。 The present invention relates to a method for expanding a metal tube end.
金属管端部の拡管加工方法として、従来より、エキスパンディング(定径拡管)、円錐状口広げ(押し広げ)が行われている(例えば非特許文献1参照)。これらはいずれも円錐台形状のテーパ部を有する拡管工具を回転させながら、金属管内に押込んで拡管するものである。尚、拡管工具を回転させる代わりに金属管を回転させながら金属管内に拡管工具を押し込むものもある。
上記従来の方法では、特に延性の低い高強度鋼管は、拡管率が比較的大きい範囲での拡管加工が困難であり、拡管加工の自由度が低いという憂いがあった。そこで、本発明は、破断限界拡管率を向上させ得る、金属管端部の拡管加工方法を提供することを目的とする。 In the conventional method described above, particularly high strength steel pipes with low ductility are difficult to expand in a range where the expansion rate is relatively large, and there is a concern that the degree of freedom of expansion is low. Then, an object of this invention is to provide the pipe expansion processing method of a metal pipe end part which can improve a fracture limit pipe expansion rate.
本発明者らは、上記目的を達成するために鋭意検討し、その結果、拡管加工の途上で管円周方向に適量の曲げ・曲げ戻しひずみが加わるようにすることにより、破断限界拡管率を向上させるという着想を得、本発明をなすに至った。
すなわち、本発明は、拡管工具又は金属管を回転させつつ拡管工具を金属管内に押し込んで金属管端部を拡管する金属管端部の拡管加工方法において、拡管加工途上で、管円周方向に2〜10%の曲げ・曲げ戻しひずみが少なくとも1回加わるようにすることを特徴とする、金属管端部の拡管加工方法である。ここで、用いる拡管工具は、軸方向直交断面が非真円形状をなす軸方向長さ部分を有するものとする。
The inventors of the present invention have intensively studied to achieve the above object, and as a result, an appropriate amount of bending / unbending strain is applied in the pipe circumferential direction in the course of pipe expansion processing, thereby reducing the fracture limit pipe expansion ratio. The idea of improving was obtained and the present invention was made.
That is, the present invention provides a method for expanding a metal tube end by pushing the tube expansion tool into the metal tube while rotating the tube expansion tool or the metal tube to expand the end of the metal tube. A method for expanding a metal tube end, wherein 2 to 10% bending / unbending strain is applied at least once. Here, the tube expansion tool to be used shall have the axial direction length part in which an axial orthogonal cross section makes non-circular shape.
拡管工具又は金属管の回転数は、拡管率10%あたり管円周方向に2〜10%の曲げ・曲げ戻しひずみが1回以上加えられる回転数であればよい。拡管工具は、該工具表面に潤滑剤を供給する螺旋状の溝を備えたものが好ましい。 The number of rotations of the tube expansion tool or the metal tube may be a number of rotations at which 2 to 10% bending / unbending strain is applied one or more times in the tube circumferential direction per 10% expansion rate. The tube expansion tool preferably has a spiral groove for supplying a lubricant to the tool surface.
本発明によれば、拡管加工の途上で管円周方向に適量の曲げ・曲げ戻しひずみが加わることにより、破断限界拡管率が向上し、金属管端部の拡管加工の自由度が高くなり、継ぎ合わせ可能な金属管サイズの組合せを多様化することができる。 According to the present invention, by applying an appropriate amount of bending / unbending strain in the pipe circumferential direction in the course of pipe expansion, the fracture limit pipe expansion rate is improved, and the degree of freedom of pipe expansion at the end of the metal pipe is increased. It is possible to diversify combinations of metal pipe sizes that can be joined.
図1は、本発明の実施形態の一例を示す概略図であり、(a)は定径拡管、(b)は押し広げの場合を示しており、(c)は(a),(b)のA断面,B断面及びC断面の断面形状を示している。定径拡管、押し広げの何れにおいても、工具(拡管工具)2を回転させながら(或いは金属管1を回転させながら)、工具2を金属管1の管内に押し込んで拡管加工するが、従来法では、拡管される金属管端部の長さ方向の各点は、加工開始から終了までの間、軸方向直交断面が真円形状に保たれる(A断面、B断面、C断面の何れも真円形状である)。
FIG. 1 is a schematic view showing an example of an embodiment of the present invention, where (a) shows a constant diameter expansion tube, (b) shows a case of expansion, and (c) shows (a) and (b). The cross-sectional shapes of A cross-section, B cross-section and C cross-section are shown. In both the constant diameter expansion and the expansion, the
これに対し、本発明では、拡管される金属管端部の長さ方向の各点は、加工開始時及び加工終了時には軸方向直交断面が真円形状である(例えばA断面及びC断面は真円形状である)が、加工の途中では、例えばB断面について図1(c)に示すように、軸方向直交断面が非真円形状(この例では楕円形状)である。即ち、本発明では、被加工部の加工途中段階での軸方向直交断面の断面形状を上記のように真円から外れた形状とし、拡管加工の途上で、管円周方向に曲げ・曲げ戻しひずみが少なくとも1回加わるようにする。これにより、バウシンガー効果を有利に発現させ、破断限界拡管率を向上させることが可能である。 On the other hand, in the present invention, each point in the length direction of the end portion of the expanded metal pipe has a perfect circular shape in the axial orthogonal section at the start of processing and at the end of processing (for example, the A section and the C section are true). In the middle of processing, for example, as shown in FIG. 1C, the cross section orthogonal to the axial direction is a non-circular shape (in this example, an elliptical shape). That is, in the present invention, the cross-sectional shape of the cross section perpendicular to the axial direction in the middle of machining of the work part is set to a shape deviating from a perfect circle as described above, and the pipe is bent and bent back in the pipe circumferential direction during the pipe expansion process. The strain is applied at least once. As a result, the Bauschinger effect can be advantageously expressed and the breaking limit tube expansion rate can be improved.
尤も、例えば図2に示すように、管円周方向に加える曲げ・曲げひずみは、2%未満では破断限界拡管率の向上効果に乏しく、一方、10%超ではひずみが過大となって、従来法よりも破断限界拡管率が低下してしまうことから、2〜10%の範囲内で加えるものとする。
被加工部の加工途中段階での軸方向直交断面の断面形状を上記のように真円から外れた形状とするには、用いる工具は、軸方向直交断面が非真円形状をなす軸方向長さ部分を有するものとする必要がある。非真円形状としては、図1(c)に示した楕円形状の他、おむすび形状等、多角形の角に丸みをもたせた形状が挙げられるが、管円周方向に2〜10%の曲げ・曲げ戻しひずみを加え得るものであれば、その具体的形状は特に限定されない。
However, as shown in FIG. 2, for example, if the bending / bending strain applied in the pipe circumferential direction is less than 2%, the effect of improving the fracture limit tube expansion rate is poor, whereas if it exceeds 10%, the strain becomes excessive. Since the fracture limit expansion rate is lower than that of the method, it should be added within the range of 2 to 10%.
To make the cross-sectional shape of the cross section orthogonal to the axial direction in the middle of processing the part to be processed out of the perfect circle as described above, the tool to be used is an axial length in which the cross section orthogonal to the axial direction forms a non-circular shape. It is necessary to have a part. Examples of the non-circular shape include not only the elliptical shape shown in FIG. 1 (c) but also a shape having a rounded corner of a polygon such as a rice ball shape, but 2 to 10% bending in the tube circumferential direction. -The specific shape is not particularly limited as long as it can add a bending back strain.
又、本発明では拡管率を従来よりも大きくすることができるが、そうした場合、拡管加工時の摩擦力が大きくなって、焼き付き等の不具合が生じやすくなる惧れがあるので、かかる不具合の発生を防止する観点から、工具2としては、図1(a),(b)にも例示したように、該工具表面に潤滑剤を供給するための螺旋状の溝(潤滑溝)3を備えたものを用いることが好ましい。尚、潤滑溝3は、図1(c)では図示を省略した。
Further, in the present invention, the tube expansion rate can be increased as compared with the conventional case, but in such a case, the frictional force at the time of tube expansion processing increases, and there is a possibility that defects such as seizure are likely to occur. As shown in FIGS. 1A and 1B, the
本発明では、拡管率は、次式を用いて算出される。
拡管率=(D−D0)/D0×100(%)
ここで、D0は拡管加工前の金属管外径、Dは拡管加工後の金属管外径である。又、右辺のDが、拡管加工中に破断を生じたときの金属管外径に該当する場合、左辺の拡管率は破断限界拡管率に該当する。
In the present invention, the tube expansion rate is calculated using the following equation.
Tube expansion rate = (D-D0) / D0 x 100 (%)
Here, D0 is the outer diameter of the metal tube before tube expansion processing, and D is the outer diameter of the metal tube after tube expansion processing. In addition, when D on the right side corresponds to the outer diameter of the metal tube when the fracture occurs during the tube expansion process, the tube expansion rate on the left side corresponds to the fracture limit tube expansion rate.
実施例として、表1に示す材料(各種電縫鋼管)を対象として、表1に示す種々の条件で拡管加工を行い、破断の有無を調査した。調査した結果を表1に示す。表1より、本発明例では、従来例及び比較例に比べ、破断限界拡管率が向上していることがわかる。 As an example, pipe expansion processing was performed under various conditions shown in Table 1 for the materials (various ERW steel pipes) shown in Table 1, and the presence or absence of breakage was investigated. The survey results are shown in Table 1. From Table 1, it can be seen that in the example of the present invention, the fracture limit tube expansion ratio is improved as compared with the conventional example and the comparative example.
1 金属管
2 工具(拡管工具)
3 潤滑溝(工具表面に潤滑剤を供給するための螺旋状の溝)
1
3 Lubricating groove (spiral groove for supplying lubricant to the tool surface)
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005299269A JP4815988B2 (en) | 2005-10-13 | 2005-10-13 | Method of expanding pipe end of metal pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005299269A JP4815988B2 (en) | 2005-10-13 | 2005-10-13 | Method of expanding pipe end of metal pipe |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007105762A true JP2007105762A (en) | 2007-04-26 |
JP4815988B2 JP4815988B2 (en) | 2011-11-16 |
Family
ID=38032023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005299269A Active JP4815988B2 (en) | 2005-10-13 | 2005-10-13 | Method of expanding pipe end of metal pipe |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4815988B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009131881A (en) * | 2007-11-30 | 2009-06-18 | Asteer Co Ltd | Method of manufacturing eccentrically expanded pipe |
WO2014010387A1 (en) * | 2012-07-13 | 2014-01-16 | 住友軽金属工業株式会社 | Tube expansion plug |
KR101603978B1 (en) * | 2015-12-03 | 2016-03-16 | 정구왕 | Pipe expanding punch |
WO2017039366A1 (en) * | 2015-09-02 | 2017-03-09 | 정구왕 | Pipe expanding punch |
CN115069912A (en) * | 2022-07-20 | 2022-09-20 | 江苏克莱德激光技术有限责任公司 | Pipeline expanding device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5768230A (en) * | 1980-10-14 | 1982-04-26 | Kawasaki Heavy Ind Ltd | Method and apparatus pipe expanding |
JPS63171226A (en) * | 1986-11-03 | 1988-07-15 | レムス・ヴェルク クリスチャン フェル ウント ゼーネ ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー | Expander device |
-
2005
- 2005-10-13 JP JP2005299269A patent/JP4815988B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5768230A (en) * | 1980-10-14 | 1982-04-26 | Kawasaki Heavy Ind Ltd | Method and apparatus pipe expanding |
JPS63171226A (en) * | 1986-11-03 | 1988-07-15 | レムス・ヴェルク クリスチャン フェル ウント ゼーネ ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー | Expander device |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009131881A (en) * | 2007-11-30 | 2009-06-18 | Asteer Co Ltd | Method of manufacturing eccentrically expanded pipe |
WO2014010387A1 (en) * | 2012-07-13 | 2014-01-16 | 住友軽金属工業株式会社 | Tube expansion plug |
JPWO2014010387A1 (en) * | 2012-07-13 | 2016-06-20 | 株式会社Uacj | Plug for expansion |
WO2017039366A1 (en) * | 2015-09-02 | 2017-03-09 | 정구왕 | Pipe expanding punch |
JP2018527191A (en) * | 2015-09-02 | 2018-09-20 | ジョン、グ ワンJUNG, Gu Wang | Pipe expansion punch |
KR101603978B1 (en) * | 2015-12-03 | 2016-03-16 | 정구왕 | Pipe expanding punch |
CN115069912A (en) * | 2022-07-20 | 2022-09-20 | 江苏克莱德激光技术有限责任公司 | Pipeline expanding device |
Also Published As
Publication number | Publication date |
---|---|
JP4815988B2 (en) | 2011-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4815988B2 (en) | Method of expanding pipe end of metal pipe | |
JP4557006B2 (en) | Plug, tube expansion method using plug, metal tube manufacturing method, and metal tube | |
US8567028B2 (en) | Injector sleeve removal device and method of use | |
CN1502015A (en) | Method for producing an expansion anchor | |
JP2009039768A (en) | Plug for cold-drawing, and method for manufacturing metal tube | |
JP4983053B2 (en) | Mechanical expander and method for producing seamless steel pipe | |
JP6020604B2 (en) | Pipe expansion machine | |
JP6851104B1 (en) | Refrigerant piping expander | |
JP2010051971A (en) | Method of bending steel pipe | |
JP6098246B2 (en) | Burring punch and burring method | |
JP4678600B2 (en) | Pipe drawing plug and method of manufacturing pipe using the same | |
JP2007050423A (en) | Method and die for squeezing metallic round pipe | |
JP6413590B2 (en) | Caulking punch | |
US5077897A (en) | Triangular scraper tool | |
RU2011140955A (en) | METHOD FOR MANUFACTURING A STEM AND DEVICE FOR ITS IMPLEMENTATION | |
JP2010142810A (en) | Method of treating pipe end of metallic pipe material and plug | |
US10369639B2 (en) | Tool for roughening a metallic surface | |
JP6329720B2 (en) | Composite member manufacturing method, composite member and composite member manufacturing apparatus | |
JP4650724B2 (en) | Pipe drawing tool and pipe manufacturing method using the same | |
JP2009142888A (en) | Drawing die | |
JP4787643B2 (en) | Caulking tool | |
JPS6313625A (en) | Necking method for circular pipe | |
JPWO2011016434A1 (en) | Plug for expanding end of metal tube, tube expansion method using plug, and method of manufacturing metal tube | |
JP2011183415A (en) | Method for manufacturing lead screw | |
JP2016073987A (en) | Device and method for manufacturing end-thickened steel pipe |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20080825 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20101215 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20101221 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20110217 |
|
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: 20110802 |
|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20110815 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140909 Year of fee payment: 3 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 4815988 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
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 |