JPH11309521A - Method for bulging stainless steel cylindrical member - Google Patents
Method for bulging stainless steel cylindrical memberInfo
- Publication number
- JPH11309521A JPH11309521A JP10114835A JP11483598A JPH11309521A JP H11309521 A JPH11309521 A JP H11309521A JP 10114835 A JP10114835 A JP 10114835A JP 11483598 A JP11483598 A JP 11483598A JP H11309521 A JPH11309521 A JP H11309521A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- heat treatment
- cylindrical member
- bulging
- bulge forming
- 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.)
- Withdrawn
Links
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明方法は、ステンレス製
筒形部材のバルジ成形方法関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulge forming method for a stainless steel cylindrical member.
【０００２】[0002]
【従来の技術】バルジ成形方法として、常温で曲げ＋バ
ルジ加工等の多段加工を行う場合に、中間で熱処理を施
して、歪みを除去することが知られている。2. Description of the Related Art As a bulge forming method, it is known that when performing multi-stage processing such as bending and bulging at room temperature, heat treatment is applied in the middle to remove distortion.
【０００３】[0003]
【発明が解決しようとする課題】上記のごとき常温での
バルジ成形方法において、ステンレス製筒形部材を成形
するに際し、ステンレス製筒形部材を曲げ加工等の加工
を施した後、熱処理し加工歪みを除去して成形すること
がある。しかして、このようなバルジ成形方法において
は、割れが発生する等成形性を低下することがある等の
課題がある。本発明方法は、このような課題を有利に解
決するためなされたものであり、加工後のステンレス製
筒形部材の熱処理による加工歪みを除去するに際し、加
工歪み量に応じて熱処理温度を調整することによって、
常温でのバルジ成形における成形性を向上するととも
に、加工限界を高めることのできるステンレス製筒形部
材のバルジ成形方法を提供することを目的とするもので
ある。In the bulge forming method at room temperature as described above, when the stainless steel tubular member is formed, the stainless steel tubular member is subjected to a process such as bending, and then subjected to a heat treatment. May be removed and molded. However, in such a bulge forming method, there are problems such as the occurrence of cracks and the deterioration of the formability. The method of the present invention has been made in order to advantageously solve such a problem, and when removing the processing strain due to the heat treatment of the processed stainless steel cylindrical member, the heat treatment temperature is adjusted according to the amount of the processing strain. By
An object of the present invention is to provide a bulge forming method for a stainless steel cylindrical member, which can improve the formability in bulge forming at room temperature and can increase the working limit.
【０００４】[0004]
【課題を解決するための手段】本発明方法の特徴とする
ところは、８％以上の加工歪みを有するステンレス製筒
形部材の鋼中結晶粒が粗大化する前の加熱温度で熱処理
を施して、加工歪みを除去した後、バルジ成形すること
を特徴とするステンレス製筒形部材のバルジ成形方法で
ある。A feature of the method of the present invention is that a stainless steel cylindrical member having a processing strain of 8% or more is subjected to a heat treatment at a heating temperature before crystal grains in steel become coarse. A bulge forming method for a stainless steel cylindrical member, which comprises forming a bulge after removing processing strain.
【０００５】[0005]
【発明の実施の形態】上記のごとき、ステンレス製筒形
部材のバルジ成形方法においては、バルジ成形に先立ち
ステンレス製筒形部材の加工歪みを熱処理により除去し
て、バルジ成形時の加工性を高めた後、バルジ成形する
ものである。しかして、ステンレス製筒形部材の加工歪
みとしては、ステンレス鋼板を筒形部材に成形するとき
に８％未満の加工歪みが発生する。このようなステンレ
ス製筒形部材を熱処理により加工歪みを除去した後、バ
ルジ成形を施す。また、ステンレス製筒形部材を曲げ加
工等によって、目的とする形状に加工した後、熱処理を
施して加工歪みを除去し、次いでバルジ成形を施すこと
もある。このようにステンレス製筒形部材を曲げ加工す
ると加工歪みとしては、８％以上になるが、これらの加
工歪みを除去する熱処理温度としては、ステンレス製筒
形部材の鋼種によって若干異なるが、一般的に７５０〜
９５０℃の同一加熱温度で処理して、加工歪みを除去し
ているのが実情である。DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, in the bulge forming method for a stainless steel tubular member, prior to the bulge forming, the processing distortion of the stainless steel tubular member is removed by heat treatment to enhance the workability in the bulge forming. After that, bulge molding is performed. Thus, as the processing distortion of the stainless steel tubular member, a processing distortion of less than 8% occurs when the stainless steel plate is formed into the cylindrical member. After such a stainless steel cylindrical member is subjected to heat treatment to remove processing strain, bulge forming is performed. Further, the stainless steel tubular member may be processed into a desired shape by bending or the like, and then subjected to a heat treatment to remove a processing distortion, and then to a bulge forming. When the stainless steel tubular member is bent in this way, the processing strain becomes 8% or more. The heat treatment temperature for removing the processing strain is slightly different depending on the steel type of the stainless steel tubular member. 750 to
The fact is that processing distortion is removed by processing at the same heating temperature of 950 ° C.
【０００６】このようにして、加工歪みを除去したステ
ンレス製筒形部材を常温でバルジ成形すると、割れが発
生する等成形性を劣化することがある。しかして、本発
明者等が、この原因を種々調査した結果、ステンレス製
筒形部材を曲げ加工等によって８％以上の加工歪みが発
生したステンレス製筒形部材の部位においては、熱処理
に際して加工時に蓄積された歪みエネルギーによって、
ステンレス鋼中の結晶粒の再結晶と結晶粒の粗大化する
温度が、８％未満の加工歪みが発生したステンレス製筒
形部材の熱処理温度より低温であることが判明した。[0006] When the stainless steel tubular member from which the processing distortion has been removed is formed by bulging at room temperature, the formability may be deteriorated, for example, cracks may be generated. As a result of various investigations of the cause by the present inventors, in a portion of the stainless steel tubular member in which a processing strain of 8% or more has been generated due to bending or the like of the stainless steel tubular member, during processing during heat treatment, With the stored strain energy,
It has been found that the temperature at which the crystal grains in the stainless steel are recrystallized and the crystal grains are coarsened is lower than the heat treatment temperature of the stainless steel cylindrical member having less than 8% processing strain.
【０００７】しかして、８％以上の加工歪みが発生した
ステンレス製筒形部材は、上記のごとき熱処理温度で
は、全て結晶粒の粗大化が起こり、バルジ成形時に成形
（加工）性が劣化して、割れ等が発生する原因になるこ
とが明らかになった。[0007] However, in the stainless steel cylindrical member in which a processing strain of 8% or more has occurred, the crystal grains are all coarsened at the above heat treatment temperature, and the formability (workability) is deteriorated during bulge forming. It became clear that cracks and the like were caused.
【０００８】このようなことから本発明方法において
は、８％以上の加工歪みを有するステンレス製筒形部材
のバルジ成形に先立って加工歪みを除去する熱処理温度
として、ステンレス製筒形部材の鋼中結晶粒の粗大化す
る前の加熱温度で熱処理することによって、常温でのバ
ルジ成形における成形性を向上するとともに、加工限界
を高めることを見出したものである。Therefore, in the method of the present invention, the heat treatment temperature for removing the processing strain prior to the bulge forming of the stainless steel cylindrical member having the processing distortion of 8% or more is determined by setting the temperature of the stainless steel cylindrical member in the steel. It has been found that by performing a heat treatment at a heating temperature before the crystal grains are coarsened, the formability in bulge forming at normal temperature is improved and the processing limit is increased.
【０００９】即ち、８％未満の加工歪みを有するステン
レス製筒形部材は、蓄積歪みエネルギーが少ないので前
記のごとく７５０〜９５０℃と高温で熱処理しても鋼中
の結晶粒の粗大化は起こらず、バルジ成形時の成形性の
劣化も発生しないが、８％以上の加工歪みを有するステ
ンレス製筒形部材は、前記のごとく蓄積歪みエネルギー
が多いことから８％未満の加工歪みを有するステンレス
製筒形部材と同様の熱処理では、結晶粒が粗大化してバ
ルジ成形時の成形性を劣化することになる。そこで、結
晶粒の粗大化が発生する前の熱処理温度で加工歪みを除
去して、バルジ成形を施すものであるが、その熱処理温
度としては、ステンレス製筒形部材の鋼種によって異な
るが、７００〜９００℃と上記のごとく８％未満の加工
歪みを有するステンレス製筒形部材の熱処理温度より低
温で処理する。かくすることによって、鋼中の結晶粒の
粗大化を防止しつつ、確実に加工歪みを除去して次工程
のバルジ成形（特に常温でのバルジ成形）を向上するこ
とができるものである。That is, a stainless steel cylindrical member having a processing strain of less than 8% has a small accumulated strain energy, so that the crystal grains in the steel are coarsened even when heat-treated at a high temperature of 750 to 950 ° C. as described above. No deterioration in formability occurs during bulge forming, but a stainless steel cylindrical member having a processing strain of 8% or more is made of a stainless steel member having a processing strain of less than 8% because of the large accumulated strain energy as described above. In the same heat treatment as in the case of the cylindrical member, the crystal grains become coarse and the formability during bulge forming deteriorates. Therefore, the bulge forming is performed by removing the processing strain at the heat treatment temperature before the crystal grains are coarsened. The heat treatment temperature varies depending on the steel type of the stainless steel cylindrical member, but 700 to The stainless steel cylindrical member having a processing strain of 900 ° C. and less than 8% as described above is processed at a temperature lower than the heat treatment temperature. By doing so, it is possible to improve the bulge forming (particularly bulge forming at normal temperature) of the next step by reliably removing the processing strain while preventing the crystal grains in the steel from becoming coarse.
【００１０】上記のごとき、熱処理温度が７００℃未満
であると加工歪みの除去が確実にできないことがあり、
しかも熱処理に時間がかかって（例えば約３０分以上）
生産性が低下することになり好ましくない。また、９０
０℃以上になると鋼中の結晶粒が粗大化してバルジ成形
時の成形性を劣化することがあり好ましくない。このよ
うに７００〜９００℃の熱処理温度においては、１〜５
分で確実に加工歪みを除去することができる。As described above, if the heat treatment temperature is lower than 700 ° C., it may not be possible to reliably remove the processing strain.
Moreover, the heat treatment takes a long time (for example, about 30 minutes or more).
Productivity is reduced, which is not preferable. Also, 90
If the temperature is 0 ° C. or higher, the crystal grains in the steel become coarse, and the formability during bulge forming may be deteriorated, which is not preferable. Thus, at a heat treatment temperature of 700 to 900 ° C., 1 to 5
Processing distortion can be reliably removed in minutes.
【００１１】次に、ステンレス製筒形部材組成の一例を
挙げる。Ｃ：０．００５〜０．２％、Ｓｉ：０．０１〜
１．０％、Ｍｎ：０．０２〜２．５％、Ｐ：０．０５％
以下、Ｓ：０．０３％以下、Ａｌ：０．０１〜８．０
％、Ｃｒ：３〜２６％、Ｎｉ：２２％以下、残りＦｅ及
び不可避的不純物からなるフェライト系ステンレス製筒
形部材、オーステナイト系ステンレス製筒形部材に有効
に適用することができる。Next, an example of the composition of the cylindrical member made of stainless steel will be described. C: 0.005 to 0.2%, Si: 0.01 to
1.0%, Mn: 0.02 to 2.5%, P: 0.05%
Hereinafter, S: 0.03% or less, Al: 0.01 to 8.0.
%, Cr: 3 to 26%, Ni: 22% or less, and can be effectively applied to ferritic stainless steel tubular members and austenitic stainless steel tubular members composed of the remaining Fe and unavoidable impurities.
【００１２】バルジ成形方法としては、成形型内に配置
した筒形部材内に油圧等による内圧を加え、製品の外形
に対応した形状に常温でバルジ成形する。または、この
ように筒形部材内に油圧等による内圧を加えるととも
に、筒形部材の長手方向両端部から圧力を付加する、軸
圧を加えて成形するバルジ成形方法、いわゆるハイドロ
フォーム加工（成形）によって成形することができる。As a bulge forming method, an internal pressure such as a hydraulic pressure is applied to a cylindrical member arranged in a forming die to form a bulge at room temperature into a shape corresponding to the outer shape of a product. Alternatively, a bulge forming method for forming by applying axial pressure while applying internal pressure such as hydraulic pressure to the cylindrical member and applying pressure from both ends in the longitudinal direction of the cylindrical member, so-called hydroforming (forming) Can be molded.
【００１３】[0013]
【実施例】次に、本発明方法の実施例を比較例とともに
挙げる。Next, examples of the method of the present invention will be described together with comparative examples.
【表１】 [Table 1]
【００１４】[0014]
【表２】（表１のつづき） [Table 2] (continuation of Table 1)
【００１５】注１：材質Ａは、Ｃ：０．０３％、Ｓｉ：
０．２％、Ｍｎ：０．１％、Ｐ：０．０３％、Ｓ：０．
０２％、Ａｌ：０．０１％、Ｃｒ：１１％、Ｎｉ：０．
０１％、残りＦｅ及不可避的不純物（フェライト系ステ
ンレス鋼板）。Ｂは、Ｃ：０．０１％、Ｓｉ：０．１
％、Ｍｎ：０．１％、Ｐ：０．０３％、Ｓ：０．０２
％、Ａｌ：３．０％、Ｃｒ：９．０％、Ｎｉ：０．０１
％、残りＦｅ及不可避的不純物（フェライト系ステンレ
ス鋼板）。Ｃは、Ｃ：０．０２％、Ｓｉ：０．３％、Ｍ
ｎ：０．２％、Ｐ：０．０３％、Ｓ：０．０２％、Ａ
ｌ：０．０３％、Ｃｒ：１８％、Ｎｉ：１１％、残りＦ
ｅ及不可避的不純物（オーステナイト系ステンレス鋼
板）。 注２：内圧は、成形時の筒形部材へ常温の水圧である。 注３：成形は、図１のごとく筒形部材１（成形前径
Ｄ0 ）をバルジ成形により、長さＤ1 、直径Ｄ2 に成形
した。 注４：成形評価は、各例とも１０本成形し、何れも割れ
等が発生しなかったもの○。割れが１〜３本発生したも
の△。割れが４本以上発生したもの×とした。Note 1: Material A is C: 0.03%, Si:
0.2%, Mn: 0.1%, P: 0.03%, S: 0.
02%, Al: 0.01%, Cr: 11%, Ni: 0.
01%, remaining Fe and inevitable impurities (ferritic stainless steel sheet). B: C: 0.01%, Si: 0.1
%, Mn: 0.1%, P: 0.03%, S: 0.02
%, Al: 3.0%, Cr: 9.0%, Ni: 0.01
%, Remaining Fe and inevitable impurities (ferritic stainless steel sheet). C is C: 0.02%, Si: 0.3%, M
n: 0.2%, P: 0.03%, S: 0.02%, A
1: 0.03%, Cr: 18%, Ni: 11%, remaining F
e. Inevitable impurities (austenitic stainless steel sheet). Note 2: The internal pressure is the water pressure at normal temperature to the cylindrical member during molding. Note 3: As shown in FIG. 1, the cylindrical member 1 (diameter D 0 before molding) was formed into a length D 1 and a diameter D 2 by bulge molding. Note 4: The molding was evaluated as “good” when ten moldings were formed in each case and no cracks or the like were generated. One to three cracks occurred. A sample having four or more cracks was evaluated as x.
【００１６】[0016]
【発明の効果】本発明方法によれば、ステンレス製筒形
部材のバルジ成形において、成形品の割れ等の発生を確
実に防止しつつ、成形することができるので、成形品の
品質を向上するとともに歩留りを高めることができる。
等の優れた効果が得られる。According to the method of the present invention, in the bulge forming of a cylindrical member made of stainless steel, the molded product can be formed while reliably preventing the occurrence of cracks and the like, so that the quality of the formed product is improved. In addition, the yield can be increased.
And other excellent effects.
【図１】本発明方法の実施例を示す側斜視図である。FIG. 1 is a side perspective view showing an embodiment of the method of the present invention.
Claims (4)
製筒形部材の鋼中結晶粒が粗大化する前の加熱温度で熱
処理を施して、加工歪みを除去した後、バルジ成形する
ことを特徴とするステンレス製筒形部材のバルジ成形方
法。1. A stainless steel tubular member having a working strain of 8% or more is subjected to a heat treatment at a heating temperature before crystal grains in steel are coarsened to remove the working strain, and then subjected to bulge forming. Bulge forming method of a stainless steel cylindrical member.
工歪みを除去した後、バルジ成形することを特徴とする
請求項１に記載のステンレス製筒形部材のバルジ成形方
法。2. The bulge forming method for a stainless steel tubular member according to claim 1, wherein the bulge forming is performed after a heat treatment at 700 to 900 ° C. to remove a processing strain.
処理して、加工歪みを除去した後、バルジ成形すること
を特徴とする請求項１または請求項２に記載のステンレ
ス製筒形部材のバルジ成形方法。3. The bulge forming of a stainless steel tubular member according to claim 1 or 2, wherein the ferrite stainless steel tubular member is heat-treated to remove a processing strain and then subjected to bulge forming. Method.
を熱処理して、加工歪みを除去した後、バルジ成形する
ことを特徴とする請求項１または請求項２に記載のステ
ンレス製筒形部材のバルジ成形方法。4. The bulge forming of a stainless steel tubular member according to claim 1, wherein the austenitic stainless steel tubular member is subjected to a heat treatment to remove a processing strain and then subjected to bulge forming. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10114835A JPH11309521A (en) | 1998-04-24 | 1998-04-24 | Method for bulging stainless steel cylindrical member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10114835A JPH11309521A (en) | 1998-04-24 | 1998-04-24 | Method for bulging stainless steel cylindrical member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11309521A true JPH11309521A (en) | 1999-11-09 |
Family
ID=14647897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10114835A Withdrawn JPH11309521A (en) | 1998-04-24 | 1998-04-24 | Method for bulging stainless steel cylindrical member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11309521A (en) |
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-
1998
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| WO2003035299A1 (en) * | 2001-10-24 | 2003-05-01 | Honda Giken Kogyo Kabushiki Kaisha | Method of forming tubular member |
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| US10422027B2 (en) | 2004-05-21 | 2019-09-24 | Ati Properties Llc | Metastable beta-titanium alloys and methods of processing the same by direct aging |
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