JP3430785B2 - Flange forming method for pipe material - Google Patents

Flange forming method for pipe material

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Publication number
JP3430785B2
JP3430785B2 JP09910896A JP9910896A JP3430785B2 JP 3430785 B2 JP3430785 B2 JP 3430785B2 JP 09910896 A JP09910896 A JP 09910896A JP 9910896 A JP9910896 A JP 9910896A JP 3430785 B2 JP3430785 B2 JP 3430785B2
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JP
Japan
Prior art keywords
flange
punch
flange forming
outer peripheral
die
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
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JP09910896A
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Japanese (ja)
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JPH09262623A (en
Inventor
幸一 生島
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Toyota Motor Corp
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Toyota Motor Corp
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Priority to JP09910896A priority Critical patent/JP3430785B2/en
Publication of JPH09262623A publication Critical patent/JPH09262623A/en
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Publication of JP3430785B2 publication Critical patent/JP3430785B2/en
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Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】この発明は、管材の端部を拡
げて鍔状に形成する管材のフランジ成形方法に関するも
のである。 【0002】 【従来の技術】円筒形粗材を、軸方向に圧縮することに
よって塑性変形させて円板状に形成する加工に、いわゆ
る据込み加工がある。一般的な据込み加工においては、
円筒形粗材の加工する部分の長さが、その円筒形粗材の
板厚の2倍以下であれば、座屈を生じることなく拡径さ
せて円板状等に形成することができる。ところが、図5
に示すように、円筒形粗材1の加工する部分の長さLが
板厚Wの2倍を超える場合には、円筒形粗材1にマンド
レル2を嵌挿した状態でパンチ3とダイ4との間で圧縮
したとしても座屈を生じ、加工後の円筒形粗材1の内周
部に、折込みと呼ばれる欠陥5が生じるという問題があ
った。 【0003】したがって、上記のように円筒形粗材1の
加工する部分の長さLが板厚Wの2倍を超える場合のフ
ランジの成形方法として、円筒形粗材1の端部を拡径方
向に変形させて円板状に形成する方法が適している。 【0004】 【発明が解決しようとする課題】しかし、円筒形粗材1
の端部を拡径方向に変形すると、外周端面が自由表面と
なり、この外周端面が円周方向に引張応力を受ける、い
わゆる伸びフランジ成形部となるため、フランジ外周部
に亀裂が生じるという問題があった。 【0005】この発明は、上記の事情に鑑みなされたも
ので、管材の端部を拡径方向に変形させてフランジを形
成する伸びフランジ成形時におけるフランジ外周部の亀
裂の発生を防止することを目的としている。 【0006】この目的は、管材の端部を伸びフランジ成
形する際に、フランジ外周部に金属材料を充分に供給す
るか、あるいは強く圧縮して外周部の延性を高めること
により達成される。 【0007】 【課題を解決するための手段およびその作用】上記の課
題を解決するための手段として請求項1記載の発明は、
管材の一端側を押し拡げてこの管材の軸方向に対してほ
ぼ垂直な平面まで展開させる管材のフランジ成形方法に
おいて、前記管材の一端側を押し拡げる途中から、その
外周側が内周側より強く圧縮されるように前記押し拡げ
られる管材の板厚方向に圧縮力を付与しながら前記平面
まで展開させることを特徴としている。 【0008】 【0009】 【0010】項1記載の発明の方法によれば、管材
の一端側を押し拡げる途中から、その外周側が内周側よ
り強く圧縮されるように、前記押し拡げられる管材の板
厚方向に圧縮力を付与しながら前記平面まで展開させる
ので、圧縮力の高い外周側から圧縮力の小さい内周側に
向けて材料の塑性流動が生じる結果、拡径が抑制される
とともに外周部の延性が高められることによって、フラ
ンジ外周部の亀裂の発生が防止される。 【0011】 【発明の実施の形態】以下、この発明の実施例を図1な
いし図4に基づいて説明する。 【0012】図1および図2は、管材のフランジ成形方
の一例を示すもので、端部をフランジ成形する管材1
1は、冷間フランジ加工する所定長さ部分をフランジ成
形部11aとして予め拡径処理しておく。この拡径処理
は、例えば、管材11の端部に円錐形の工具を圧入して
行い、そのフランジ成形部11aと管材11の軸線との
成す角度θ0 が約45度となるように漏斗状に形成する
もので、拡径処理された管材11は、その内空部にマン
ドレル12を嵌挿した状態で、ポンチ13とダイス14
との互いに対向する面間において挟圧してフランジ状に
成形される。 【0013】この実施例のフランジ成形方法を行う装置
としては、その一例を図1に示すように、鉛直方向に昇
降駆動されるポンチ13と、このポンチ13の下方に固
設されたダイス14とで構成されており、ダイス14の
上面14aは、水平な平滑面に形成されるとともに、こ
の上面14aの中央には、管材11が密に嵌合する内径
の孔14bが、上面14aに対して垂直に形成されてい
る。 【0014】また、ポンチ13の下面13aは、このポ
ンチ13の下降限において前記ダイス14の上面14a
と密に接触する平滑面に形成されるとともに、下面13
aの中央には、予め拡径処理された前記管材11のフラ
ンジ成形部11aの外径D2より大きい直径D3 で、か
つ完成時のフランジの厚さに等しい深さTの円形凹部1
5が形成されている。また、フランジ成形部11aの外
径D2 と円形凹部15の直径D3 との関係は、D2 ≦D
3 であれば良いが、D3 はフランジ成形部11aをポン
チ13とダイス14との間で挟圧した際に、段部15a
にフランジ成形部11aの外周部が必ず接触できる径で
なければならない。 【0015】また、円形凹部15の中心には、フランジ
成形部11aに嵌挿されるマンドレル12が摺動可能に
嵌合する内径の孔13bが、前記ダイス14に形成され
た孔13bと同軸上に形成されている。また、前記円形
凹部15の外周部の段部15aの鉛直方向を0度したと
きの傾きθ1 が、0≦θ1 ≦45度の範囲に形成され、
フランジ成形部11aの拡径しようとする外周部と確実
に係合して、フランジ成形部11aに対して、板厚方向
と直交する方向に圧縮力が付与されるようになってい
る。 【0016】次に、上記したポンチ13とダイス14を
用いて、予め拡径処理された管材11をフランジ成形す
る場合について説明すると、先ず、一端を漏斗状に拡径
処理された管材11にマンドレル12を嵌挿し、このマ
ンドレル12を嵌挿した状態の管材11の他端側をダイ
ス14の孔14bに嵌挿する。したがって、拡径された
フランジ成形部11aとマンドレル12の上端側が孔1
4bから延出した状態となり、漏斗状に形成されたフラ
ンジ成形部11aの基端部が、孔14bとマンドレル1
2とによって固定される。次いで、ポンチ13に形成さ
れている孔13bに、前記マンドレル12の上端側の部
分を嵌挿し、この状態でポンチ13を下降させると、フ
ランジ成形部11aの外周部が円形凹部15の内側に当
接する(図1の状態)。 【0017】フランジ成形部11aは、最も大径となる
外周部を、円形凹部15の底面に当接して垂直方向に押
圧される。その結果、フランジ成形部11aが予め約4
5度に拡径処理されているため、このフランジ成形部1
1aが円滑に拡径される。そして、フランジ成形部11
aの外周部が、円形凹部15の外周の段部15aに係合
した後は、拡径方向の変形が規制されるため、このフラ
ンジ成形部11aには、板厚方向と直交する方向に圧縮
力が加えられながら、ダイス14とポンチ13との間で
挟圧されて(図2の左半部参照)、ダイス14の上面1
4aに密着するまで、すなわち管材11の軸線に対して
垂直となるまで挟圧して、フランジ成形を終了する(図
2の右半分を参照)。 【0018】したがって、フランジ成形部11aの外周
部は、ポンチ13の円形凹部15の段部15aに拘束さ
れた状態、すなわち板厚方向と直交する方向に常時圧縮
力が付与された状態でダイス13とポンチ14との間で
挟圧されるため、成形が完了するまでフランジ成形部1
1aの外周部へ材料が充分に供給され続けるため、この
外周部の延性が高められ、外周部の材料割れ等の成形不
良の発生を確実に防止することができる。 【0019】したがって、亀裂等の成形不良のないフラ
ンジを形成できる。特に、据込み鍛造によるフランジ成
形および自由鍛造、ヘラ加工等によるフランジ成形では
成形不可能とされていた材料伸び率が18%以上となる
管材のフランジ成形が可能となり、また、管材にフラン
ジを一体形成できるので、フランジを溶接等で管材に取
付けた場合より強度アップおよびコストダウンが図れ
る。なお、この実施例のフランジ成形方法によって成形
可能なフランジの材料伸び率の限界は約65%である。 【0020】なお、この実施例においては、ダイス14
の上面14aを平滑面に形成した場合について説明した
が、ポンチ13側の円形凹部15と対向する位置に、同
じ直径の凹部を形成して、上下の凹部を合わせた容積
が、成形しようとするフランジの体積と等しくなるよう
に形成しても同様の作用効果が得られる。 【0021】また図3および図4はこの発明の実施例を
示すもので、前記一例における構成と同一の構成部分に
は同一の符号を付してその詳細な説明を省略して以下図
面に基づいて説明する。 【0022】この実施例のフランジ成形方法においても
管材11の端部のフランジ成形部11aを約45度とな
るように漏斗状に拡径処理して用いるもので、この管材
11aの内空部にマンドレル12を嵌挿した状態で、こ
のフランジ成形部11aをポンチ23とダイス24との
互いに対向する面間において挟圧してフランジ状に成形
する。 【0023】この実施例の管材のフランジ成形方法を行
う装置は、その一例を図3および図4に示すように、鉛
直方向に昇降駆動されるポンチ23と、このポンチ23
の下方に固設されたダイス24とで構成されている。 【0024】そして、ポンチ23の下面23aは、平面
に対する角度θ2 が約5度の浅いすり鉢状に形成され、
その中央には、マンドレル12の上端側を嵌挿する孔2
3bが、このポンチ23のストローク方向と平行に形成
されている。またダイス24の上面24aは、平面に対
する角度θ3 が約10度の浅いすり鉢状に形成され、そ
の中央には管材11の下端側を嵌挿する孔24bが、ポ
ンチ23に形成された孔23と同一軸線上、すなわち鉛
直方向に形成されている。そして、ポンチ23がストロ
ークして下降限に達した状態では、ポンチ23の下面2
3aとダイス24の上面24aとは、その外周部におい
て若干の間隙を残して対向するダイス24の上面24a
との間には、外周側の厚みが薄い円盤状の空間が形成さ
れ、この下面23aと上面24aとの間でフランジ成形
部11aを挟圧して円盤状のフランジに形成するように
なっている。 【0025】次に、上記したポンチ23とダイス24を
用いて、予め拡径処理された管材11をフランジ成形す
る場合について説明すると、先ず、一端を漏斗状に拡径
処理された管材11にマンドレル12を嵌挿し、このマ
ンドレル12を嵌挿した状態の管材11の他端側をダイ
ス24の孔24bに嵌挿する。したがって、拡径された
フランジ成形部11aとマンドレル12の上端側が孔2
4bから上方へ延出した状態となり、漏斗状に形成され
たフランジ成形部11aの基端部が、孔24bとマンド
レル12とによって固定される。次いで、ポンチ23に
形成されている孔23bに、前記マンドレル12の上端
側の部分を嵌挿し、この状態でポンチ23を下降させる
と、先ず、フランジ成形部11aの外周部がポンチ23
の下面23aに当接する(図3の状態)。 【0026】フランジ成形部11aは、最も大径である
外周部を、ポンチ23の下面23aに当接して垂直方向
に押圧される。その結果、約45度に形成されているフ
ランジ成形部11aが円滑に拡径されるとともに、フラ
ンジ成形部11aの外周面だった面(図3において下側
の面)が、ダイス24の上面24aに密着した後は、ポ
ンチ23aの下面とダイス24の上面24aとの間で挟
圧されることにより、このフランジ成形部11aには、
板厚方向に圧縮力が加えられる。 【0027】そして、板厚方向に圧縮力が加えられたフ
ランジ成形部11aは、上下両面23a,24a間に形
成された前記円盤状の空間内に充満するように塑性変形
する(図4の左半部参照)。このとき、上下両面23
a,24a間の間隙が、中心側が広くて外周側が狭く形
成されているため、板厚方向に圧縮された際に内周側よ
り外周側が強く圧縮されることとなり、外周に自由表面
が残っていても、圧縮された材料に、圧縮力の低い中心
方向に向う流れが生じてそれ以上の拡径が規制される
(図4の右半部参照)。 【0028】したがって、フランジ成形部11aの外周
部は、高い圧力で圧縮されて延性が向上するとともに、
一定以上の拡径が規制されるため亀裂等の成形不良の発
生が防止される。 【0029】なお、この実施例においては、予め拡径処
理された管材11をフランジ加工する場合について説明
したが、事前に拡径処理を行わずに、拡径工程とフラン
ジ成形工程とを連続して行うこともできる。この場合に
は、管材の端部を拡径させる中空円錐形の金型を分割型
としてポンチの下面に設けておき、拡径工程が完了した
段階で分割除去した後、ポンチによってフランジ成形工
程を行うようにする。 【0030】また、パンチ23とダイス24との互いに
対向する面23a,24aの傾斜角度およびフランジ成
形部11aの長さを変えることによって、成形できるフ
ランジの大きさを任意に設定することができる。 【0031】 【発明の効果】この発明の方法によれば、押し拡げられ
る管材の外周側が内周側より強く圧縮されるように管材
の板厚方向に圧縮力を付与しながら展開させるので、圧
縮力の小さい内周側に向けて材料の塑性流動が生じる結
果、拡径が抑制されるとともに外周部の延性が高められ
るため、フランジ外周部の亀裂の発生が防止され、材料
伸び率が18%以上のフランジ成形も可能となる。 【0032】
Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for forming a flange of a pipe by expanding an end of the pipe to form a flange. 2. Description of the Related Art There is a so-called upsetting process in which a cylindrical coarse material is plastically deformed by being compressed in an axial direction to form a disk. In general upsetting,
If the length of the portion to be processed of the cylindrical coarse material is not more than twice the plate thickness of the cylindrical coarse material, it can be formed into a disk shape or the like by expanding the diameter without buckling. However, FIG.
As shown in the figure, when the length L of the portion to be machined of the cylindrical coarse material 1 exceeds twice the plate thickness W, the punch 3 and the die 4 with the mandrel 2 inserted in the cylindrical coarse material 1 are inserted. However, there is a problem that buckling occurs even if the compression is performed between the above and a defect 5 called a fold is generated in the inner peripheral portion of the cylindrical rough material 1 after processing. Accordingly, as described above, as a method of forming a flange when the length L of the portion to be processed of the cylindrical coarse material 1 exceeds twice the plate thickness W, the end of the cylindrical coarse material 1 is enlarged. A method of forming a disk by deforming in the direction is suitable. [0004] However, the cylindrical coarse material 1
When the end of the flange is deformed in the diameter-enlarging direction, the outer peripheral end surface becomes a free surface, and the outer peripheral end surface receives a tensile stress in the circumferential direction. there were. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent the occurrence of cracks in the outer peripheral portion of a flange at the time of forming an extension flange by deforming an end portion of a pipe in a radially expanding direction to form a flange. The purpose is. [0006] This object is achieved by sufficiently supplying a metal material to the outer peripheral portion of the pipe when the end portion of the tubular material is stretch-flanged or by strongly compressing the outer peripheral portion to increase the ductility of the outer peripheral portion. Means for Solving the Problems and Their Functions The invention according to claim 1 as means for solving the above problems is as follows.
In a method for forming a flange of a tube material in which one end of the tube is expanded and expanded to a plane substantially perpendicular to the axial direction of the tube , in the middle of expanding the one end of the tube ,
Push and expand so that the outer circumference is more strongly compressed than the inner circumference
Is characterized in that is deployed in the thickness way direction of are tube until the plane while applying a compressive force. [0008] [0009] [0010] According to the method of billed to claim 1 Symbol placement of invention, from the middle to expand pushing the one end of the tubing, so that its outer periphery is compressed more strongly than the inner circumferential side, spread the press Since it expands to the flat surface while applying a compressive force in the thickness direction of the pipe material to be obtained, as a result of plastic flow of the material from the outer peripheral side having a high compressive force toward the inner peripheral side having a small compressive force, diameter expansion is suppressed. In addition, since the ductility of the outer peripheral portion is enhanced, the occurrence of cracks in the outer peripheral portion of the flange is prevented. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. [0012] Figures 1 and 2 show an example of a flanging method of the tubing, the tubing 1 to flanging the end
In the case of 1, a predetermined length portion to be cold-flanged is subjected to diameter expansion processing in advance as a flange forming portion 11a. This diameter expansion processing is performed, for example, by press-fitting a conical tool into the end of the tube material 11 and forming a funnel shape so that the angle θ0 between the flange forming portion 11a and the axis of the tube material 11 is about 45 degrees. The pipe material 11 that has been subjected to the diameter expansion processing is formed with a punch 13 and a die 14 in a state where the mandrel 12 is fitted in the inner space.
Is pressed between the surfaces facing each other to form a flange shape. As an example of an apparatus for performing the flange forming method of this embodiment, as shown in FIG. 1, a punch 13 driven to move vertically and a die 14 fixed below the punch 13 are shown. The upper surface 14a of the die 14 is formed as a horizontal smooth surface, and in the center of the upper surface 14a, a hole 14b having an inner diameter into which the tube 11 is closely fitted is formed with respect to the upper surface 14a. It is formed vertically. The lower surface 13a of the punch 13 is connected to the upper surface 14a of the die 14 at the lower limit of the punch 13.
And a lower surface 13
In the center of a, a circular concave portion 1 having a diameter D3 larger than the outer diameter D2 of the flange forming portion 11a of the tube material 11 previously subjected to the diameter expansion and having a depth T equal to the thickness of the completed flange.
5 are formed. The relationship between the outer diameter D2 of the flange forming portion 11a and the diameter D3 of the circular recess 15 is D2 ≦ D
3, but D3 is the stepped portion 15a when the flange forming portion 11a is pressed between the punch 13 and the die 14.
The diameter must be such that the outer peripheral portion of the flange forming portion 11a can always come into contact therewith. At the center of the circular recess 15, a hole 13b having an inner diameter into which the mandrel 12 inserted into the flange forming portion 11a is slidably fitted is coaxial with the hole 13b formed in the die 14. Is formed. Further, the inclination θ 1 when the vertical direction of the step portion 15 a of the outer peripheral portion of the circular concave portion 15 is 0 degree is formed in a range of 0 ≦ θ 1 ≦ 45 degrees,
The flange forming portion 11a is securely engaged with the outer peripheral portion of the flange forming portion 11a to be expanded, and a compressive force is applied to the flange forming portion 11a in a direction orthogonal to the plate thickness direction. Next, a description will be given of a case where the tube material 11 whose diameter has been expanded in advance is formed into a flange by using the punch 13 and the die 14 described above. First, one end of the tube material 11 whose diameter is expanded in a funnel shape is attached to the mandrel. Then, the other end of the tube 11 with the mandrel 12 inserted therein is inserted into the hole 14 b of the die 14. Therefore, the upper end side of the flange forming part 11a and the mandrel 12 whose diameter has been increased is the hole 1
4b, and the base end of the funnel-shaped flange forming portion 11a is formed by the hole 14b and the mandrel 1.
2 and fixed. Next, the upper end portion of the mandrel 12 is fitted into the hole 13b formed in the punch 13, and the punch 13 is lowered in this state, so that the outer peripheral portion of the flange forming portion 11a contacts the inside of the circular concave portion 15. Touch (the state of FIG. 1). The outer peripheral portion having the largest diameter is pressed against the bottom surface of the circular concave portion 15 in the vertical direction. As a result, the flange forming portion 11a is
Since the diameter is increased by 5 degrees, the flange forming portion 1
1a is smoothly expanded. And the flange forming part 11
After the outer peripheral portion a engages with the step portion 15a on the outer periphery of the circular concave portion 15, the deformation in the radially expanding direction is restricted. Therefore, the flange forming portion 11a is compressed in a direction orthogonal to the plate thickness direction. While the force is being applied, a pressure is applied between the die 14 and the punch 13 (see the left half of FIG. 2), and the upper surface 1 of the die 14 is pressed.
Pressing is carried out until it comes into close contact with 4a, that is, perpendicular to the axis of the tube material 11, and the flange forming is completed (see the right half of FIG. 2). Therefore, the outer peripheral portion of the flange forming portion 11a is constrained by the step 15a of the circular concave portion 15 of the punch 13, that is, in a state in which a compressive force is constantly applied in a direction orthogonal to the plate thickness direction. Between the flange forming part 1 and the punch 14 until the forming is completed.
Since the material continues to be sufficiently supplied to the outer peripheral portion of 1a, ductility of the outer peripheral portion is enhanced, and occurrence of molding defects such as material cracks in the outer peripheral portion can be reliably prevented. Therefore, a flange free from molding defects such as cracks can be formed. In particular, it is possible to form a flange with a material elongation of 18% or more, which has been considered impossible by flange forming by upset forging and flange forming by free forging, spatula processing, etc. Since it can be formed, the strength can be increased and the cost can be reduced as compared with the case where the flange is attached to the pipe by welding or the like. The limit of the material elongation of the flange that can be formed by the flange forming method of this embodiment is about 65%. In this embodiment, the dies 14
The case where the upper surface 14a is formed as a smooth surface has been described, but a concave portion having the same diameter is formed at a position facing the circular concave portion 15 on the punch 13 side, and the volume of the upper and lower concave portions is to be molded. The same operation and effect can be obtained even if it is formed to be equal to the volume of the flange. Further those FIGS. 3 and 4 showing the actual施例of the invention, drawings and a detailed description thereof will be omitted with the same reference numerals are used to designate the same components in the previous SL of example It will be described based on. Also in the flange forming method of this embodiment, the flange forming portion 11a at the end of the tube material 11 is used after being subjected to a funnel-shaped expansion process so as to have an angle of about 45 degrees. With the mandrel 12 inserted, the flange forming portion 11a is pressed between the opposing surfaces of the punch 23 and the die 24 to form a flange. As shown in FIGS. 3 and 4, an apparatus for performing the method of forming a flange of a pipe material according to this embodiment includes a punch 23 which is driven to move up and down in a vertical direction.
And a die 24 fixed below. The lower surface 23a of the punch 23 is formed in a shallow mortar shape having an angle θ 2 with respect to a plane of about 5 degrees.
In the center thereof, a hole 2 for inserting the upper end of the mandrel 12 is provided.
3b is formed parallel to the stroke direction of the punch 23. The upper surface 24a of the die 24 is formed in a shallow mortar shape having an angle θ 3 with respect to a plane of about 10 degrees, and a hole 24b for inserting the lower end side of the tube material 11 is formed at the center thereof in a hole 23 formed in the punch 23. Are formed on the same axis, that is, in the vertical direction. Then, in a state where the punch 23 has stroked and reached the lower limit, the lower surface 2 of the punch 23
The upper surface 24a of the die 24 is opposed to the upper surface 24a of the die 24 with a slight gap left at the outer peripheral portion.
A disk-shaped space having a small thickness on the outer peripheral side is formed between the lower surface 23a and the upper surface 24a, and the flange forming portion 11a is pressed between the lower surface 23a and the upper surface 24a to form a disk-shaped flange. . Next, a description will be given of the case where the pipe material 11 whose diameter has been expanded in advance is formed into a flange using the punch 23 and the die 24. First, one end of the pipe material 11 whose diameter has been expanded in a funnel shape is attached to the mandrel. 12, and the other end of the tube 11 with the mandrel 12 inserted is inserted into the hole 24 b of the die 24. Therefore, the upper end side of the flange forming portion 11a and the mandrel 12 whose diameters have been expanded are
4b, the base end of the funnel-shaped flange forming portion 11a is fixed by the hole 24b and the mandrel 12. Next, the upper end of the mandrel 12 is fitted into the hole 23b formed in the punch 23, and the punch 23 is lowered in this state.
(See FIG. 3). The outer peripheral portion having the largest diameter contacts the lower surface 23a of the punch 23 and is pressed vertically by the flange forming portion 11a. As a result, the flange forming portion 11a formed at about 45 degrees is smoothly expanded in diameter, and the surface (the lower surface in FIG. 3) which was the outer peripheral surface of the flange forming portion 11a is changed to the upper surface 24a of the die 24. After being in close contact with the die 23, the flange 23a is pressed between the lower surface of the punch 23a and the upper surface 24a of the die 24.
A compressive force is applied in the thickness direction. Then, the flange forming portion 11a to which the compressive force is applied in the thickness direction is plastically deformed so as to fill the disk-shaped space formed between the upper and lower surfaces 23a and 24a (left in FIG. 4). See half). At this time, the upper and lower surfaces 23
Since the gap between a and 24a is formed so that the center side is wide and the outer side is narrower, when compressed in the thickness direction, the outer side is more strongly compressed than the inner side, leaving a free surface on the outer side. Even in this case, a flow toward the center having a low compressive force is generated in the compressed material, and the further expansion is restricted (see the right half of FIG. 4). Accordingly, the outer peripheral portion of the flange forming portion 11a is compressed under high pressure to improve ductility, and
Since the diameter expansion beyond a certain value is regulated, the occurrence of molding defects such as cracks is prevented. In this embodiment, the case where the pipe material 11 which has been subjected to the diameter expansion processing in advance is flanged is described. However, the diameter expansion step and the flange forming step are continuously performed without performing the diameter expansion processing in advance. You can also do it. In this case, a hollow conical mold for expanding the diameter of the end of the tube is provided on the lower surface of the punch as a split mold, and after the diameter expanding step is completed, the mold is divided and removed. To do. The size of the moldable flange can be arbitrarily set by changing the inclination angles of the surfaces 23a and 24a of the punch 23 and the die 24 facing each other and the length of the flange forming portion 11a. According to the method of the present invention , the spread
Tubing so that the outer circumference of the tubing is more strongly compressed than the inner circumference
Because be deployed while imparting a compressive force plate thickness ways in direction, pressure
Plastic flow of the material toward the inner peripheral side where the compressive force is small
As a result, the expansion of the diameter is suppressed and the ductility of the outer peripheral portion is enhanced, so that the occurrence of cracks in the outer peripheral portion of the flange is prevented, and the flange can be formed with a material elongation of 18% or more. [0032]

【図面の簡単な説明】 【図1】この発明の第1実施例の成形方法における管材
のフランジ成形部とポンチおよびダイスとの関係を示す
断面側面図である。 【図2】同じくポンチが下降途中(左半部)および下死
点(右半部)のときのフランジ成形部の状態を示す断面
側面図である。 【図3】この発明の第2実施例の成形方法における管材
のフランジ成形部とポンチおよびダイスの関係を示す断
面側面図である。 【図4】同じくポンチが下降途中(左半部)および下死
点(右半部)のときのフランジ成形部の状態を示す断面
側面図である。 【図5】座屈限界を超えた粗材長さの据込み加工となる
場合を示す断面側面図である。 【図6】同じく座屈限界を超えた粗材長さの据込み加工
によって発生した折込み欠陥を示す断面側面図である。 【符号の説明】 11 管材 11a フランジ成形部 12 マンドレル 13 ポンチ 13a ポンチの下面 14 ダイス 14a ダイスの上面 15 円形凹部 23 ポンチ 23a ポンチの傾斜した下面 24 ダイス 24a ダイスの傾斜した上面
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional side view showing a relationship between a flange forming portion of a pipe, a punch and a die in a forming method according to a first embodiment of the present invention. FIG. 2 is a cross-sectional side view showing the state of the flange forming portion when the punch is in the process of descending (left half) and at the bottom dead center (right half). FIG. 3 is a cross-sectional side view showing a relationship between a flange forming portion of a pipe, a punch and a die in a forming method according to a second embodiment of the present invention. FIG. 4 is a cross-sectional side view showing the state of the flange forming portion when the punch is in the process of descending (left half) and at the bottom dead center (right half). FIG. 5 is a cross-sectional side view showing a case where upsetting of a coarse material length exceeding a buckling limit is performed. FIG. 6 is a cross-sectional side view showing a fold defect generated by upsetting of a coarse material length exceeding the buckling limit. DESCRIPTION OF SYMBOLS 11 Tube material 11a Flange forming part 12 Mandrel 13 Punch 13a Punch lower surface 14 Dice 14a Dice upper surface 15 Circular recess 23 Punch 23a Punch inclined lower surface 24 Dice 24a Dice inclined upper surface

Claims (1)

(57)【特許請求の範囲】 【請求項1】 管材の一端側を押し拡げてこの管材の軸
方向に対してほぼ垂直な平面まで展開させる管材のフラ
ンジ成形方法において、 前記管材の一端側を押し拡げる途中から、その外周側が
内周側より強く圧縮されるように前記押し拡げられる管
材の板厚方向に圧縮力を付与しながら前記平面まで展開
させることを特徴とする管材のフランジ成形方法。
(57) Claims 1. A method for forming a flange of a tubular material by expanding one end of the tubular material to a plane substantially perpendicular to the axial direction of the tubular material. From the middle of spreading , the outer peripheral side
The tube which is pushed and expanded so as to be more strongly compressed than the inner peripheral side
Flanging method of the tubing, characterized in that to deploy to the plane while applying a compressive force to the plate thickness way direction of wood.
JP09910896A 1996-03-28 1996-03-28 Flange forming method for pipe material Expired - Fee Related JP3430785B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP09910896A JP3430785B2 (en) 1996-03-28 1996-03-28 Flange forming method for pipe material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP09910896A JP3430785B2 (en) 1996-03-28 1996-03-28 Flange forming method for pipe material

Publications (2)

Publication Number Publication Date
JPH09262623A JPH09262623A (en) 1997-10-07
JP3430785B2 true JP3430785B2 (en) 2003-07-28

Family

ID=14238642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP09910896A Expired - Fee Related JP3430785B2 (en) 1996-03-28 1996-03-28 Flange forming method for pipe material

Country Status (1)

Country Link
JP (1) JP3430785B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4450447B2 (en) * 1999-02-23 2010-04-14 プレス工業株式会社 Sensor ring flange machining method
ATE494087T1 (en) * 2007-08-03 2011-01-15 Ifutec Ingenieurbuero Fuer Umformtechnik Gmbh METHOD FOR FORMING A TUBE ELEMENT
CN115647226B (en) * 2022-12-03 2024-03-26 苏州市越海拉伸机械有限公司 Reaming device and reaming process for thin-wall pipe
CN117884533A (en) * 2024-03-15 2024-04-16 蜂巢能源科技股份有限公司 Cover plate assembly forming process and cover plate

Also Published As

Publication number Publication date
JPH09262623A (en) 1997-10-07

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