JPH0857534A - Manufacture of tube multilayered with different kinds of metal having various thermal expansion coefficient - Google Patents
Manufacture of tube multilayered with different kinds of metal having various thermal expansion coefficientInfo
- Publication number
- JPH0857534A JPH0857534A JP21823194A JP21823194A JPH0857534A JP H0857534 A JPH0857534 A JP H0857534A JP 21823194 A JP21823194 A JP 21823194A JP 21823194 A JP21823194 A JP 21823194A JP H0857534 A JPH0857534 A JP H0857534A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- cross
- metal
- multilayered
- section
- 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
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、径方向の残留応力が残
らない異なる熱膨張率を持つ異種金属多重管の製造方法
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 producing a multi-metal tube of different metals having different coefficients of thermal expansion without residual stress in the radial direction.
【0002】[0002]
【従来の技術】異なる熱膨張率を持つ二種類の金属を、
それぞれ内管、外管として冶金的に接合された二重管
を、熱間等方圧加圧接合やロウ付け等の加熱接合工程を
経て製造すると、熱膨張率の小さい材質の部分に圧縮応
力、熱膨張率の大きな材質の部分に引張応力が残留す
る。2. Description of the Related Art Two kinds of metals having different coefficients of thermal expansion are
When double pipes, which are metallurgically joined as an inner pipe and an outer pipe, are manufactured through a hot joining process such as hot isostatic pressing and brazing, compressive stress is applied to the part of the material with a small coefficient of thermal expansion. The tensile stress remains in the part of the material having a large coefficient of thermal expansion.
【0003】このような残留応力を持つ二重管の一部を
切削除去して製品を作製しようとすると、残留応力のた
め、曲がり、径の歪等が発生する。軸方向の曲がりの矯
正は比較的容易であるが、径の歪は矯正が困難である。
従って特に径方向の残留応力を除去しておくことが望ま
しく、冷間で拡管あるいは縮管により残留応力を除去す
ることが考えられる。When a part of a double pipe having such a residual stress is cut and removed to manufacture a product, bending, diameter distortion, etc. occur due to the residual stress. It is relatively easy to correct the axial bend, but it is difficult to correct the radial distortion.
Therefore, it is particularly desirable to remove the residual stress in the radial direction, and it is conceivable to remove the residual stress by expanding or contracting the pipe in the cold.
【0004】[0004]
【発明が解決しようとする課題】上記のように冷間で拡
管あるいは縮管を行なえば、塑性加工を伴うために、残
留応力は除去されるが、異型管で、かつ内管が軟質の純
銅のような場合には、拡管や縮管は困難で、高コストで
ある。As described above, when cold pipe expansion or contraction is performed, residual stress is removed due to plastic working, but it is a deformed pipe and the inner pipe is pure copper. In such cases, it is difficult to expand or contract the tube, and the cost is high.
【0005】本発明では、上述の欠点を解消しより簡便
で、かつ低コストで残留応力を除去することができる異
種金属多重管の製造方法を提供することを目的とするも
のである。It is an object of the present invention to provide a method for manufacturing a dissimilar metal multi-tube, which is capable of eliminating the above-mentioned drawbacks, and which is capable of removing residual stress more simply and at low cost.
【0006】[0006]
【課題を解決するための手段】本発明の上記目的は、次
の如き手段を採用することにより達成できる。即ち、断
面の形状が、目的の管の断面形状とは断面の曲率の大部
分が異なる形状の多重金属管を、熱間で接合し、一体に
形成し、目的の形状の管に冷間で断面を変形させること
によって径方向の残留応力を除去するのである。より具
体的に説明すれば、例えば、断面が四角形や楕円形の製
品を得ようとすれば、円形断面の多重管を変形せしめて
四角形や楕円形にすればよいのである。The above object of the present invention can be achieved by adopting the following means. That is, a multi-metal tube having a cross-sectional shape different from most of the cross-sectional shape of the target tube in a curvature of the cross-section is hot-bonded and integrally formed, and the tube having the target shape is cold-formed. The residual stress in the radial direction is removed by deforming the cross section. More specifically, for example, in order to obtain a product having a quadrangular or elliptical cross section, a multiple pipe having a circular cross section may be deformed into a quadrangular or elliptical shape.
【0007】[0007]
【実施例】以下本発明を実施例に基づいて説明する。外
管1が炭素鋼、内管2が純銅であって、図1〜図6に示
されるような形状の短管を数多く製造するに際して、従
来の方法では予め図示の形状に近い炭素鋼と純銅の管を
作製しておき、熱間等方圧加圧接合、熱間引抜き、ロウ
付け等の方法で、加熱された状態で冶金的な接合を行な
う。比較的長尺の状態で接合して短尺に切断することが
多いが、短尺の状態で接合を行なうこともある。いずれ
の方法によっても炭素鋼に圧縮、純銅に引張応力が残る
のは避けられない。EXAMPLES The present invention will be described below based on examples. When many outer tubes 1 are made of carbon steel and the inner tube 2 is made of pure copper and a number of short tubes having the shapes shown in FIGS. The tube is prepared in advance, and metallurgical joining is performed in a heated state by methods such as hot isostatic pressing, hot drawing, and brazing. In many cases, they are joined in a relatively long state and cut into short pieces, but sometimes joined in a short state. It is inevitable that carbon steel will be compressed and pure copper will be left with tensile stress by either method.
【0008】図1〜図6共に、熱間接合によって歪の発
生は避けられず、いくらかの矯正は必要である。内、外
面に切削代を残しておいても、歪を残した状態では炭素
鋼、純銅のそれぞれの厚さが所定の寸法を外れてしまう
からである。図1,図2に示す物は炭素鋼の外周を切削
除去するときに、歪が発生し、内外面の少量多数回の切
削が要求される。図5,図6に示す物は溝3の切削によ
って径方向の歪が生じ、製造が困難である。In both FIGS. 1 to 6, the occurrence of strain due to hot bonding is unavoidable and some correction is necessary. This is because even if a cutting allowance is left on the inner and outer surfaces, the respective thicknesses of carbon steel and pure copper deviate from the predetermined dimensions when strain is left. The products shown in FIGS. 1 and 2 are distorted when the outer periphery of carbon steel is cut and removed, and it is required to cut the inner and outer surfaces a small number of times. The products shown in FIGS. 5 and 6 are difficult to manufacture because the grooves 3 cause radial strain.
【0009】本発明では、所定の周長の単純形状、例え
ば円形断面の二重管を作製しておき、図1〜図6に示す
如き形状の異型管にすることで、径方向の残留応力が除
去できる。断面形状の変化によって、少しの周長の変化
は避けられず、それも残留応力の除去に資するが、本発
明の趣旨は周の曲率の塑性変形によって、その目的の大
部分を達成しようとするものである。In the present invention, the residual stress in the radial direction can be obtained by preparing a simple tube having a predetermined circumference, for example, a double tube having a circular cross section, and using the modified tube having the shape shown in FIGS. Can be removed. Due to the change in the cross-sectional shape, a slight change in the circumferential length is unavoidable, which also contributes to the removal of the residual stress, but the gist of the present invention is to achieve most of the purpose by plastic deformation of the curvature of the circumference. It is a thing.
【0010】図7は、図1,図2に示した物の使用状態
を示すが、炭素鋼板4に、銅管5を固定し、シール溶接
するについて、トランジションジョイント6として使用
される。図中7,8は共に溶接部であるが、特に8の溶
接部によってトランジションジョイント6の異種材の剥
離が生じる恐れがあり、残留応力の除去は剥離の防止に
も役立つ。FIG. 7 shows a use state of the objects shown in FIGS. 1 and 2, and is used as a transition joint 6 for fixing a copper pipe 5 to a carbon steel plate 4 and performing seal welding. In the figure, both 7 and 8 are welded portions, but there is a possibility that the dissimilar material of the transition joint 6 may be peeled off by the welded portion 8 in particular, and removal of residual stress also helps prevent peeling.
【0011】以上述べて来た残留応力の除去方法は、二
重管のみでなく、三重以上の多重管であっても同様であ
る。The residual stress removing method described above is applicable not only to double pipes but also to multiple pipes of three or more pipes.
【0012】[0012]
【発明の効果】以上説明したように、本発明方法によれ
ば、まず熱間で最終目的の管とは断面形状が異なる管を
作り、それを冷間で断面形状を変化させる如き加工を施
すので、塑性変形が生じ径方向の残留応力が除去できる
ものである。As described above, according to the method of the present invention, first, a tube having a cross-sectional shape different from that of the final target tube is hot-worked, and then cold-worked so that the cross-sectional shape is changed. Therefore, plastic deformation occurs and residual stress in the radial direction can be removed.
【図1】本発明実施例で得ようとする二重管の平面図で
ある。FIG. 1 is a plan view of a double pipe to be obtained in an embodiment of the present invention.
【図2】図1のA−A線に於ける断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図3】本発明実施例で得ようとする他の二重管の平面
図である。FIG. 3 is a plan view of another double tube to be obtained in the embodiment of the present invention.
【図4】図3のB−B線に於ける断面図である。FIG. 4 is a sectional view taken along line BB in FIG.
【図5】本発明実施例で得ようとする更に他の二重管の
平面図である。FIG. 5 is a plan view of still another double tube to be obtained in the embodiment of the present invention.
【図6】図5の一部切欠正面図である。6 is a partially cutaway front view of FIG.
【図7】図1,図2に示した二重管の使用状態の一例を
示す説明図である。7 is an explanatory diagram showing an example of a usage state of the double pipe shown in FIGS. 1 and 2. FIG.
【符号の説明】 1 外管 2 内管[Explanation of symbols] 1 outer tube 2 inner tube
Claims (1)
多重管を製造するに際して、断面の形状が、目的の管の
断面形状とは断面の周の曲率の大部分が異なる形状の多
重金属管を、熱間で接合し、一体に形成し、目的の形状
の管に冷間で断面を変形させることによって径方向の残
留応力を除去することを特徴とする異なる熱膨張率を持
つ異種金属多重管の製造方法。1. When manufacturing a dissimilar metal multi-tube made of metals having different coefficients of thermal expansion, a multi-metal tube having a cross-sectional shape different from the cross-sectional shape of the target tube in most of the curvature of the circumference of the cross-section. Are joined together by heat and formed integrally, and the residual stress in the radial direction is removed by deforming the cross section into the pipe of the desired shape by cold deformation. Pipe manufacturing method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21823194A JP3400564B2 (en) | 1994-08-18 | 1994-08-18 | Method for manufacturing dissimilar metal multi-tubes with different coefficients of thermal expansion |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21823194A JP3400564B2 (en) | 1994-08-18 | 1994-08-18 | Method for manufacturing dissimilar metal multi-tubes with different coefficients of thermal expansion |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0857534A true JPH0857534A (en) | 1996-03-05 |
JP3400564B2 JP3400564B2 (en) | 2003-04-28 |
Family
ID=16716669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21823194A Expired - Lifetime JP3400564B2 (en) | 1994-08-18 | 1994-08-18 | Method for manufacturing dissimilar metal multi-tubes with different coefficients of thermal expansion |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3400564B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107737816A (en) * | 2017-12-02 | 2018-02-27 | 山东新纪元特钢有限公司 | A kind of right angle square tube |
-
1994
- 1994-08-18 JP JP21823194A patent/JP3400564B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107737816A (en) * | 2017-12-02 | 2018-02-27 | 山东新纪元特钢有限公司 | A kind of right angle square tube |
Also Published As
Publication number | Publication date |
---|---|
JP3400564B2 (en) | 2003-04-28 |
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