JP2000271636A - Forming die for manufacturing welded metal tube - Google Patents
Forming die for manufacturing welded metal tubeInfo
- Publication number
- JP2000271636A JP2000271636A JP8533599A JP8533599A JP2000271636A JP 2000271636 A JP2000271636 A JP 2000271636A JP 8533599 A JP8533599 A JP 8533599A JP 8533599 A JP8533599 A JP 8533599A JP 2000271636 A JP2000271636 A JP 2000271636A
- Authority
- JP
- Japan
- Prior art keywords
- die
- forming
- curved surface
- arc
- diameter part
- 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.)
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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、オープンパイプに成形
した金属帯の幅方向両端部を突合せ溶接して溶接金属管
を製造する際に使用するダイスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die used for producing a welded metal pipe by butt-welding both ends in the width direction of a metal strip formed into an open pipe.
【０００２】[0002]
【従来の技術】溶接金属管の製造方法として、ダイスを
用いた引抜き加工で金属帯をオープンパイプ状に成形
し、幅方向両端部を突合せ溶接する方法が知られてい
る。この方法は、ロールフォーミング法のように多数の
ロール対を必要としないため設備コストが軽減され、ロ
ール組替えの作業も不要なため、多品種・小ロット生産
に適している。引抜き加工による成形では、図１に示す
ように成形に要する引抜き力がダイスのテーパ角度で変
化するため、引抜き力が最小になるようにダイス角度を
設定する必要がある。そこで、本発明者等は、断面プロ
フィールが直線テーパ状の二次曲面で主要部分を構成
し、ダイス入側及び最小径部を必要に応じて小Ｒで面取
りしたダイスを特許第２７９０８８７号，特開平９−３
２７７１９号公報で紹介した。2. Description of the Related Art As a method for manufacturing a welded metal pipe, a method is known in which a metal strip is formed into an open pipe shape by drawing using a die, and both ends in the width direction are butt-welded. Since this method does not require a large number of roll pairs unlike the roll forming method, the equipment cost is reduced, and the work of changing the rolls is not required. In the forming by the drawing process, as shown in FIG. 1, the drawing force required for the forming varies depending on the taper angle of the die. Therefore, it is necessary to set the die angle so that the drawing force is minimized. In view of this, the present inventors have disclosed in Japanese Patent No. 279087, a die in which the main part is formed by a quadratic curved surface having a linear tapered cross-sectional profile, and the die entry side and the minimum diameter portion are chamfered with a small radius as necessary. Kaihei 9-3
No. 27719.
【０００３】ダイス成形における引抜き力Ｆは、たとえ
ば丸棒を引抜き加工する場合、ダイス角度に依らない断
面減少抵抗Ｆ1 ，ダイス角度が大きくなるほど増加する
剪断変形抵抗Ｆ2 及びダイス角度が大きくなるほど減少
する摩擦抵抗Ｆ3 の和Ｆ＝Ｆ 1 ＋Ｆ2 ＋Ｆ3 として求め
られる（養賢堂発行 益田森治・室田忠雄共著「工業塑
性力学」第１９１頁第６図）。[0003] The drawing force F in die forming is, for example,
When a round bar is drawn out, it does not depend on the die angle.
Surface reduction resistance F1 , Increases as the die angle increases
Shear deformation resistance FTwo And decreases as die angle increases
Frictional resistance FThree Sum of F = F 1 + FTwo + FThree Asked as
(Yokendo Publishing, Morita Masuda & Tadao Murota
Sexual Mechanics ", page 191, FIG. 6).
【０００４】[0004]
【発明が解決しようとする課題】引抜き力Ｆを低減する
ため、特開平９−３２７７１９号公報にみられるよう
に、捻れ対策を施した上で金属帯の幅を狭くし従来５％
以上であったダイスによる断面減少率をほぼ０％にする
と、金属丸棒又は金属管の引抜きと異なり断面減少抵抗
Ｆ1 が非常に小さくなると共に、ダイスと被加工材との
接触面積も小さくなるため摩擦抵抗Ｆ3 も小さくなる。
その結果、引抜き力Ｆに占める剪断変形抵抗Ｆ2 の割合
が非常に大きくなる。In order to reduce the pulling force F, as disclosed in Japanese Patent Application Laid-Open No. 9-327719, a countermeasure against twisting is taken and the width of the metal band is reduced to 5%.
With almost zero percent reduction of area by the A dice above, the cross-section decreased resistance F 1 different from the withdrawal of metal rod or the metal tube is very small, even smaller area of contact between the die and the workpiece frictional resistance F 3 is also small for.
As a result, the ratio of the shear deformation resistance F 2 to the pulling force F becomes very large.
【０００５】剪断変形抵抗Ｆ2 が非常に大きな割合を占
める引抜き加工では、引抜き力Ｆの低減及び成形後の機
械的特性を確保するために適正なダイス形状は、従来の
丸棒や管の引抜きと類似した断面減少を前提とする設計
思想を変更する必要がある。因みに、従来のダイスを用
いた金属管の成形では、ダイス出側（最小孔付近）で発
生する剪断変形のため、断面減少に起因する余分な歪み
を抑制しながら製造された金属管であっても、代表的な
造管法であるロール成形法で製造された溶接金属管に比
較すると機械的性質が著しく劣る。[0005] In the drawing the shear deformation resistance F 2 occupies a very large proportion, proper die geometry in order to ensure the mechanical properties after reduction and shaping of the pulling force F is withdrawal of the conventional round bar and the tube It is necessary to change the design philosophy on the premise that the cross section is reduced, similar to the above. Incidentally, in forming a metal tube using a conventional die, a metal tube manufactured while suppressing excess distortion due to a reduction in cross section due to shear deformation occurring on the die exit side (near the smallest hole). However, the mechanical properties are remarkably inferior to those of a welded metal pipe manufactured by a roll forming method which is a typical pipe forming method.
【０００６】[0006]
【課題を解決するための手段】本発明は、このような問
題を解消すべく案出されたものであり、ダイスに形成さ
れる成形用貫通孔のダイス長手方向に沿った断面プロフ
ィールを円弧状曲面で構成することにより、金属帯に加
えられる剪断歪みを抑制し、機械的性質の劣化がない溶
接金属管を製造することを目的とする。SUMMARY OF THE INVENTION The present invention has been devised to solve such a problem, and has an arc-shaped cross-sectional profile of a forming through hole formed in a die along the longitudinal direction of the die. It is an object of the present invention to manufacture a welded metal pipe having a curved surface, which suppresses shear strain applied to a metal strip and does not deteriorate mechanical properties.
【０００７】本発明は、その目的を達成するため、金属
帯をオープンパイプ状に成形する溶接金属管製造用成形
ダイスであって、金属帯の入側から出側に向けて内径が
小さくなる成形用貫通孔が形成されており、入側から又
は入側と最小径部との途中から最小径部に至る成形用貫
通孔のダイス長手方向に沿った断面プロフィールが最小
径部を通るダイス中心軸に垂直な面上に中心をもつ円弧
状曲面又はダイス最小径部における断面プロフィールを
構成する曲線の接線がダイス中心線と平行となる曲面で
構成されていることを特徴とする。円弧状曲面の曲率半
径Ｒは、金属帯の板厚をｔ，ヤング率をＥ，降伏応力を
σ e とするとき、曲率半径Ｒをｔ・Ｅ／５０σe 以上と
することが好ましい。[0007] The present invention has been developed in order to attain the object.
Forming of welded metal pipes to form a belt into an open pipe
A die with an inner diameter from the entry side to the exit side of the metal strip.
A small through hole for molding is formed.
Is the molding thread from the middle of the entry side and the minimum diameter part to the minimum diameter part.
Minimum cross-sectional profile along the length of the die
An arc centered on a plane perpendicular to the center axis of the die passing through the diameter
The cross-sectional profile at the minimum diameter part
A curved surface where the tangent of the curve that constitutes it is parallel to the die center line
It is characterized by comprising. Curvature half of arc-shaped surface
The diameter R is t for the thickness of the metal strip, E for the Young's modulus, and Y for the yield stress.
σ e , The radius of curvature R is t · E / 50σe And above
Is preferred.
【０００８】[0008]
【実施の形態】ダイスを用いた造管法では、図２に示す
ようにアンコイラ１から金属帯Ｓを送り出し、エッジベ
ンドロール２，ダイス入側ガイドロール３，成形ダイス
１０，ダイス出側ガイドロール４を経てオープンパイプ
状に成形した後、シームガイドロール５で溶接部を案内
した状態でスクイズロール７で保形し、金属帯Ｓ1 の幅
方向両端部を溶接装トーチ６等の溶接装置で溶接する。
次いで、溶接金属管Ｐは、矯正ロール群８及び引抜き装
置９を経て送り出される。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a tube forming method using a die, as shown in FIG. 2, a metal band S is sent out from an uncoiler 1, and an edge bend roll 2, a die entrance side guide roll 3, a forming die 10, a die exit side guide roll. After forming the pipe into an open pipe shape, the welded portion is guided by the seam guide roll 5 and is shaped by the squeeze roll 7. Both ends of the metal strip S 1 in the width direction are welded by a welding device such as a welding torch 6. Weld.
Next, the welded metal pipe P is sent out through the straightening roll group 8 and the drawing device 9.
【０００９】被加工材である金属帯Ｓが成形ダイス１０
にほぼ充満する最小径部で発生する剪断歪みは、成形さ
れた金属管Ｐの機械的性質を損う原因になる。機械的性
質を劣化させる剪断歪みが抑制されると、多数の成形ロ
ールを多段に配置したロールフォーミング法による造管
法で製造された溶接金属管に匹敵する性質をもつ溶接金
属管が得られる。The metal strip S, which is the workpiece, is
The shear strain generated at the minimum diameter portion substantially filling the metal pipe P causes the mechanical properties of the formed metal tube P to be impaired. When the shear strain that deteriorates the mechanical properties is suppressed, a weld metal pipe having properties comparable to those of a weld metal pipe manufactured by a pipe forming method using a roll forming method in which a large number of forming rolls are arranged in multiple stages is obtained.
【００１０】剪断歪みは、ダイス最小径部でダイスの長
手方向に沿った断面プロフィールをダイス出側の流れ方
向に緩やかに一致させることにより抑制できる。具体的
には、図３（ａ）に示すように、成形ダイス１０の孔径
が最小になる最小径部１１を通る成形ダイス１０の中心
軸に垂直な面上に中心Ｃをもち、中心Ｃから成形ダイス
１０の中心軸に向かう曲率半径Ｒの円弧状曲面１２で成
形ダイス１０の長手方向に沿った断面プロフィールを設
計する。断面プロフィールを曲線にすることにより、円
弧状曲面１２に沿った長手方向の曲げ歪みが金属帯Ｓに
新たに生じる。長手方向の曲げ歪みによる機械的性質の
劣化程度は、金属帯Ｓの幅方向全域に発生する剪断歪み
による劣化程度よりも遥かに少ない。[0010] Shear distortion can be suppressed by making the cross-sectional profile along the longitudinal direction of the die at the minimum diameter portion of the die gently coincide with the flow direction on the exit side of the die. Specifically, as shown in FIG. 3A, the center of the forming die 10 has a center C on a plane perpendicular to the center axis of the forming die 10 passing through the minimum diameter portion 11 where the hole diameter of the forming die 10 is minimized. A cross-sectional profile along the longitudinal direction of the forming die 10 is designed by an arc-shaped curved surface 12 having a radius of curvature R toward the center axis of the forming die 10. By bending the cross-sectional profile, a bending strain in the longitudinal direction along the arcuate curved surface 12 is newly generated in the metal band S. The degree of deterioration of the mechanical properties due to the bending strain in the longitudinal direction is far less than the degree of deterioration due to the shear strain generated in the entire width direction of the metal band S.
【００１１】成形ダイス１０の断面プロフィールを円弧
状曲面１２で構成した場合、成形ダイス１０に角度θで
進入した金属帯Ｓは、円弧状曲面１２に沿ってダイス中
心線となす角度をダイス出側の角度まで徐々に変化させ
る。そのため、目的とする幅方向の曲げ加工以外に金属
帯Ｓに加わる歪みは、円弧状曲面１２に沿って長手方向
に曲げられる歪み（板厚をｔ，曲げ半径をＲとすると
き、板表面における歪みの最大値は約ｔ／２Ｒで表わさ
れる）が大部分を占める。他方、成形ダイス１０の断面
プロフィールが直線の場合、成形ダイス１０に角度θで
進入した金属帯Ｓは、ダイス出側までダイスプロフィー
ルに沿ってダイス中心線となす角度をθに保ち、成形ダ
イス１０の最小径部１１で角度を急激に０まで変化させ
る。そのため、角度が急激に変化するとき、加工目的で
はない大きな剪断歪みが発生する。円弧状曲面１２に沿
った長手方向の曲げ歪みは板表面で最大（絶対値）とな
り板厚中央で０となるのに対し、直線プロフィールに起
因する剪断歪みは板厚方向全域にわたって生じるため、
材料特性に及ぼす影響が大きい。更に、曲線プロフィー
ルでは、プロフィールを構成する曲線を適正に選ぶこと
で、摩擦の大幅な増大（ダイス長さの増大）を回避しな
がら曲げ歪みを軽減できる。この点、直線プロフィール
では、前述したように剪断歪みを小さくしようとすれば
著しく摩擦の影響が増大するため、剪断歪みを有効に軽
減することは困難である。When the cross-sectional profile of the forming die 10 is constituted by an arcuate curved surface 12, the metal band S entering the forming die 10 at an angle θ forms an angle between the die centerline along the arcuate curved surface 12 and the die exit side. Gradually change to the angle. Therefore, in addition to the desired bending in the width direction, the strain applied to the metal band S is the strain that is bent in the longitudinal direction along the arc-shaped curved surface 12 (when the plate thickness is t and the bending radius is R, The maximum value of the distortion is represented by about t / 2R). On the other hand, when the cross-sectional profile of the forming die 10 is a straight line, the metal band S that has entered the forming die 10 at an angle θ maintains the angle between the die center line and the die center line along the die profile up to the die exit side at θ. The angle is rapidly changed to 0 at the minimum diameter portion 11 of. Therefore, when the angle changes abruptly, a large shear strain not intended for processing occurs. The bending strain in the longitudinal direction along the arcuate curved surface 12 is maximum (absolute value) on the plate surface and becomes 0 at the center of the plate thickness, whereas the shear strain caused by the linear profile occurs over the entire region in the plate thickness direction.
Has a large effect on material properties. Further, in the curved profile, by appropriately selecting the curves constituting the profile, bending distortion can be reduced while avoiding a large increase in friction (an increase in die length). In this regard, in the case of the linear profile, as described above, if the shear strain is reduced, the influence of friction is significantly increased, so that it is difficult to effectively reduce the shear strain.
【００１２】また、成形ダイス１０の長手方向に沿った
断面プロフィールの曲率半径Ｒの最小値をｔ・Ｅ／５０
σe （ただし、ｔ：板厚，σe ：降伏応力，Ｅ：ヤング
率）で表わされる値に規制すると、ダイス１０の円弧状
曲面１２に沿った長手方向の曲げ歪みの最大値（ｔ／２
Ｒ，板表面）が金属帯素材の弾性限界歪み（σe ／Ｅ）
の２５倍以内に抑制され、長手方向曲げ歪みによる塑性
変形量が製品の機械的性質に及ぼす影響が一層小さくな
る。たとえば、本発明に従った曲線プロフィールダイス
の長手方向の曲げ歪みの最大値は、σe ＝２００ＭＰ
ａ，Ｅ＝２００ＧＰａのときσe ／Ｅ＝０．１％とな
り、板表面での曲げ歪みは弾性限界歪みの２５倍の２．
５％で板厚方向に平均すると１．２５％になる。これに
対し、半角１１度の直線状プロフィールの剪断歪み［γ
＝tan （１１°）］を伸び歪みに換算すると約１０％に
なる。Further, the minimum value of the radius of curvature R of the cross-sectional profile along the longitudinal direction of the forming die 10 is defined as t · E / 50.
When restricted to a value represented by σ e (t: sheet thickness, σ e : yield stress, E: Young's modulus), the maximum value of the bending strain in the longitudinal direction along the arcuate curved surface 12 of the die 10 (t / 2
R, plate surface) is the elastic limit strain of the metal strip material (σ e / E)
And the effect of the amount of plastic deformation due to longitudinal bending strain on the mechanical properties of the product is further reduced. For example, the maximum value of the bending strain in the longitudinal direction of the curved profile die according to the present invention is σ e = 200MP.
a, E = 200 GPa, σ e /E=0.1%, and the bending strain on the plate surface is 25 times as large as the elastic limit strain.
An average of 5% in the thickness direction is 1.25%. On the other hand, the shear strain [γ
= Tan (11 °)] is approximately 10% when converted to elongation strain.
【００１３】断面プロフィールを円弧状曲面１２で設計
するとき、成形ダイス１０の入側で金属帯Ｓが成形ダイ
ス１０の成形用孔部に進入する角度θが大きくなる。大
きな進入角θは、特に金属帯Ｓのエッジ部Ｓe に大きな
剪断変形や曲げ変形を発生させ易い。機械的性質に悪影
響を及ぼすエッジ部Ｓe の剪断変形や曲げ変形を抑制す
るためには、進入角θを３０度以下にすることが好まし
い。円弧状曲面１２で構成される断面プロフィールのう
ち、ダイス最小径部１１による剪断変形に影響を及ぼさ
ない成形ダイス１０入側の一部を円弧状曲面１２から接
線方向に延びる直線状円錐面１３（図３ｂ）で置き換え
ても良い。これにより、金属帯Ｓ又は溶接金属管Ｐの機
械的性質に悪影響を及ぼすことなく、ダイス長さを短く
できる。円弧状曲面１２の曲率半径Ｒは、成形ダイス１
０の長手方向に沿って一定ではなく、成形ダイス１０の
入側から出側に向けて漸次大きくなる曲率半径であって
も良い。When the cross-sectional profile is designed with the arcuate curved surface 12, the angle θ at which the metal band S enters the forming hole of the forming die 10 on the entry side of the forming die 10 becomes large. Large approach angle theta, particularly prone to generate large shear deformation and bending deformation at the edge S e of the metal strip S. In order to suppress shear deformation and bending deformation adversely affects the edge portion S e mechanical properties, it is preferable that the approach angle θ below 30 degrees. Of the cross-sectional profile constituted by the arc-shaped curved surface 12, a part of the entry side of the forming die 10 which does not affect the shear deformation by the minimum diameter portion 11 of the die is formed into a straight conical surface 13 extending tangentially from the arc-shaped curved surface 12 ( 3b). Thereby, the die length can be shortened without adversely affecting the mechanical properties of the metal band S or the welded metal pipe P. The radius of curvature R of the arcuate curved surface 12 is
The radius of curvature may not be constant along the longitudinal direction of 0, but may gradually increase from the entry side to the exit side of the forming die 10.
【００１４】曲率半径Ｒを大きく、また進入角θを小さ
くすると、摩擦抵抗がなく引抜き力及び製品の機械的性
質に与える悪影響が少なくなる。具体的には、１１度前
後の進入角で引抜き力が最小になる。しかし、過度に大
きな曲率半径Ｒや過度に小さな進入角θでは長い成形ダ
イス１０を必要とし経済性を損ねるので、製造しようと
する溶接金属管Ｐのサイズにもよるが、外径６〜２０ｍ
ｍの溶接金属管Ｐを製造する場合には１５〜３００ｍ
ｍ，１０〜３０度の範囲に曲率半径Ｒ及び進入角θがそ
れぞれ設定される。When the radius of curvature R is large and the angle of approach θ is small, there is no frictional resistance, and the adverse effects on the pulling force and the mechanical properties of the product are reduced. Specifically, the pull-out force is minimized at an approach angle of about 11 degrees. However, an excessively large radius of curvature R or an excessively small approach angle θ requires a long forming die 10 and impairs economic efficiency. Therefore, depending on the size of the welded metal pipe P to be manufactured, the outer diameter is 6 to 20 m.
15 to 300 m when manufacturing a welded metal pipe P
m, the radius of curvature R and the approach angle θ are set in the range of 10 to 30 degrees.
【００１５】[0015]
【実施例】図２に示す造管ラインを使用し、板厚１．０
ｍｍ，板幅３９．０ｍｍ及び板厚１．２ｍｍ，板幅３
８．５ｍｍの金属帯Ｓを成形ダイス１０でオープンパイ
プ状に成形し、外径１２．７ｍｍの溶接金属管Ｐを製造
した。このとき、以下に掲げる複数のダイスを使用し、
ダイスに形成した成形用貫通孔の断面プロフィールが得
られた溶接金属管Ｐに及ぼす影響を調査した。なお、機
械的性質に関しては、溶接等による影響を排除するた
め、成形ダイス１０を通過してオープンパイプ状に成形
された金属帯Ｓの機械的性質を測定した。[Embodiment] The pipe forming line shown in FIG.
mm, board width 39.0 mm, board thickness 1.2 mm, board width 3
An 8.5 mm metal band S was formed into an open pipe shape with a forming die 10 to produce a welded metal pipe P having an outer diameter of 12.7 mm. At this time, use multiple dice listed below,
The influence of the cross-sectional profile of the forming through hole formed in the die on the obtained welded metal pipe P was investigated. Regarding the mechanical properties, the mechanical properties of the metal strip S that passed through the forming die 10 and was formed into an open pipe shape were measured in order to eliminate the influence of welding or the like.
【００１６】（ダイスＡ：図４ａ） 長さ６０．６３ｍ
ｍの成形ダイス１０に入側孔径３９．０ｍｍ，最小径部
１１の内径１３．４ｍｍの成形用貫通孔を形成し、入側
から最小径部１１に至る成形ダイス１０の長手方向に沿
った断面プロフィールを曲率半径Ｒを１５０ｍｍに設定
した。 （ダイスＢ） ダイス長さ８０．２９ｍｍで、入側孔径
及び最小径部１１の内径はダイスＡと同じであるが、入
側と最小径部１１との途中から最小径部１１に至る成形
ダイス１０の長手方向に沿った断面プロフィールを曲率
半径Ｒ１５０ｍｍの円弧状曲面１２で構成し、金属帯Ｓ
の進入角θが１１度となるように、円弧状曲面１２より
も入側の断面プロフィールを円弧状曲面１２の接線方向
に延びる直線状円錐面１３で構成した。(Die A: FIG. 4a) Length 60.63m
A molding through-hole having an entrance side hole diameter of 39.0 mm and an inner diameter of 13.4 mm of the minimum diameter portion 11 is formed in the molding die 10 having a diameter of m, and a cross section along the longitudinal direction of the molding die 10 from the entry side to the minimum diameter portion 11 The profile was set to have a radius of curvature R of 150 mm. (Dice B) A die having a length of 80.29 mm and an inlet hole diameter and an inner diameter of the minimum diameter portion 11 is the same as the die A, but a molding die extending from the middle of the inlet side and the minimum diameter portion 11 to the minimum diameter portion 11. 10 is constituted by an arc-shaped curved surface 12 having a radius of curvature R150 mm along a longitudinal direction of the metal band S.
The cross-sectional profile on the entry side of the arc-shaped curved surface 12 is constituted by a linear conical surface 13 extending in the tangential direction of the arc-shaped curved surface 12 so that the angle of approach θ becomes 11 degrees.
【００１７】（ダイスＣ：図４ｂ） 入側の孔径を３
９．０ｍｍ，最小径部１１の内径を１３．４ｍｍとし、
入側から最小径部１１に至る成形ダイス１０の長手方向
に沿った断面プロフィール全域を直線状円錐面で構成し
た。１１度の進入角θを得るため、ダイスＣの長さを６
５．８５ｍｍにする必要があった。 （ダイスＤ） 入側の孔径を３９．０ｍｍ，最小径部１
１の内径を１３．４ｍｍとし、入側の途中から最小径部
１１に至る成形ダイス１０の長手方向に沿った断面プロ
フィールを半角１１度の直線状円錐面１３で構成し、成
形ダイス１０の長さを４６．６８ｍｍにするため円弧状
曲面１２と入側との間を直線状円錐面で構成した。ダイ
スＤの進入角θは、２７．３度であった。(Dice C: FIG. 4b)
9.0 mm, the inner diameter of the minimum diameter portion 11 is 13.4 mm,
The entire cross-sectional profile along the longitudinal direction of the forming die 10 from the entry side to the minimum diameter portion 11 was constituted by a straight conical surface. In order to obtain an approach angle θ of 11 degrees, the length of the die C is 6
It had to be 5.85 mm. (Die D) The diameter of the entrance hole is 39.0 mm, and the minimum diameter part is 1.
1 has an inner diameter of 13.4 mm, and a cross-sectional profile along the longitudinal direction of the forming die 10 from the middle of the entry side to the minimum diameter portion 11 is constituted by a straight conical surface 13 having a half angle of 11 degrees. In order to make the height 46.68 mm, a straight conical surface was formed between the arcuate curved surface 12 and the entry side. The approach angle θ of the die D was 27.3 degrees.
【００１８】表１の調査結果にみられるように、本発明
に従ったダイスＡ，Ｂを用いて金属帯Ｓを成形した場
合、ダイスＣ，Ｄに比較して引抜き力が数％〜１０％低
減しており、オープンパイプ状に成形された金属帯Ｓの
降伏応力が約２５〜３０ＭＰａ，引張強さが５〜２０Ｍ
Ｐａと低く、全伸びが１０％程度改善された。特に、ダ
イスＣ，Ｄを用いた成形では素材に比較して成形品の伸
びが１０％程度低下するのに対し、ダイスＡ，Ｂを用い
た場合には成形前の素材とほぼ同じ全伸びを示してお
り、加工性に優れていることが判る。また、本発明例で
は、成形後の伸びが素材よりも高くなっている場合も見
受けられるが、これは試験片形状の影響（素材は板のた
めＪＩＳ ５号試験片，成形後は小径管のためＪＩＳ
１１号試験片）で、同等の特性の場合にエッジのある５
号試験片よりもパイプ状の１１号試験片の方が伸びが大
きくなり易いためである。As can be seen from the investigation results in Table 1, when the metal strip S is formed using the dies A and B according to the present invention, the drawing force is several% to 10% as compared with the dies C and D. The yield stress of the metal strip S formed into an open pipe shape is about 25 to 30 MPa, and the tensile strength is 5 to 20 M
Pa was low, and the total elongation was improved by about 10%. In particular, in the molding using the dies C and D, the elongation of the molded article is reduced by about 10% as compared with the material, while in the case of using the dies A and B, the total elongation is almost the same as the material before molding. This indicates that the workability is excellent. In addition, in the example of the present invention, it is observed that the elongation after molding is higher than that of the material, but this is due to the influence of the shape of the test piece (the material is a plate, JIS No. 5 test piece; JIS
No. 11 test piece) with the same characteristics
This is because the pipe-shaped No. 11 test piece has a larger elongation than the No. 11 test piece.
【００１９】 [0019]
【００２０】[0020]
【発明の効果】以上に説明したように、本発明の溶接金
属管製造用成形ダイスは、成形用貫通孔のダイス長手方
向に沿った断面プロフィールの少なくとも最小径部に至
る部分を円弧状曲面で構成することにより、剪断歪みに
起因する機械的性質の劣化を抑制し、一般的なロールフ
ォーミング法に匹敵する性質を備えた溶接金属管の製造
を可能にする。そのため、多数の成形ロールを必要とす
るロールフォーミング法に比較して設備コストが低く、
ロール組替え等の作業を要しないダイス成形法の長所を
活用し、優れた性質をもつ溶接金属管が製造される。As described above, in the forming die for producing a welded metal pipe according to the present invention, at least a portion of the cross-sectional profile of the forming through hole extending to the minimum diameter portion along the longitudinal direction of the die is formed by an arc-shaped curved surface. By configuring, it is possible to suppress deterioration of mechanical properties due to shear strain, and to manufacture a welded metal pipe having properties comparable to a general roll forming method. Therefore, the equipment cost is lower than the roll forming method that requires a large number of forming rolls,
Utilizing the advantages of the die forming method that does not require operations such as changing rolls, a welded metal pipe having excellent properties is manufactured.
【図１】 直線プロフィール（円錐面）で構成された断
面プロフィールをもつダイスで成形した時のダイス角度
と素材の引抜き力との関係を示すグラフFIG. 1 is a graph showing a relationship between a die angle and a material pulling force when formed by a die having a cross-sectional profile constituted by a linear profile (conical surface).
【図２】 ダイス成形法による造管ラインのレイアウトFig. 2 Layout of pipe making line by die forming method
【図３】 本発明に従った成形ダイスの２例FIG. 3 shows two examples of a molding die according to the present invention.
【図４】 成形用貫通孔のダイス長手方向に沿った断面
プロフィール全域を円弧状曲面（ａ）及び直線状円錐面
（ｂ）で設計した成形ダイスFIG. 4 is a forming die in which the entire cross-sectional profile of the forming through hole along the longitudinal direction of the die is designed with an arcuate curved surface (a) and a straight conical surface (b).
１０：成形ダイス １１：成形用貫通孔の最小径部
１２：円弧状曲面 １３：直線状円錐面 Ｃ：円弧状曲面の中心 Ｒ：円弧状曲面の曲率半径
θ：金属帯の進入角 Ｓ：金属帯 Ｓe ：金属帯のエッジ部 Ｐ：溶接金
属管10: forming die 11: minimum diameter part of forming through hole
12: arc-shaped curved surface 13: linear conical surface C: center of arc-shaped curved surface R: radius of curvature of arc-shaped curved surface
θ: metal strip entry angle S: metal strip S e : edge of metal strip P: welded metal pipe
Claims (2)
イスであって、金属帯の入側から出側に向けて内径が小
さくなる成形用貫通孔が形成されており、入側から又は
入側と最小径部との途中から最小径部に至る成形用貫通
孔のダイス長手方向に沿った断面プロフィールが最小径
部を通るダイス中心軸に垂直な面上に中心をもつ円弧状
曲面又はダイス最小径部における断面プロフィールを構
成する曲線の接線がダイス中心線と平行となる曲面で構
成されている溶接金属管製造用成形ダイス。1. A die for forming a metal band into an open pipe shape, wherein a forming through hole having an inner diameter decreasing from an entrance side to an exit side of the metal band is formed, and a die is formed from the entrance side or the entrance side. The cross-sectional profile along the die longitudinal direction of the through hole for forming from the middle of the minimum diameter part to the minimum diameter part has an arc-shaped curved surface or die centered on a plane perpendicular to the die center axis passing through the minimum diameter part. A forming die for producing a welded metal pipe, wherein a tangent of a curve constituting a cross-sectional profile in a small diameter portion is formed by a curved surface parallel to a center line of the die.
応力をσe とするとき、円弧状曲面の曲率半径Ｒをｔ・
Ｅ／５０σe 以上としている請求項１記載の溶接金属管
製造用成形ダイス。2. When the thickness of the metal strip is t, the Young's modulus is E, and the yield stress is σ e , the radius of curvature R of the arc-shaped curved surface is t ·
The molding die for producing a welded metal pipe according to claim 1, which has an E / 50? E or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8533599A JP2000271636A (en) | 1999-03-29 | 1999-03-29 | Forming die for manufacturing welded metal tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8533599A JP2000271636A (en) | 1999-03-29 | 1999-03-29 | Forming die for manufacturing welded metal tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000271636A true JP2000271636A (en) | 2000-10-03 |
Family
ID=13855781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8533599A Withdrawn JP2000271636A (en) | 1999-03-29 | 1999-03-29 | Forming die for manufacturing welded metal tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000271636A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002192223A (en) * | 2000-12-26 | 2002-07-10 | Nisshin Steel Co Ltd | Manufacturing method for welded metal pipe |
| CN104148495A (en) * | 2014-07-10 | 2014-11-19 | 苏州鸿大金属制品有限公司 | Progressive umbrella handle copper pipe drawing die assembly |
| CN104364026A (en) * | 2012-04-13 | 2015-02-18 | 杰富意钢铁株式会社 | Device and method for producing flangeless closed-cross-section-structure component having curved shape |
| CN105598224A (en) * | 2016-02-03 | 2016-05-25 | 安徽鸿路钢结构(集团)股份有限公司 | Pre-bending process for longitudinal submerged arc welding pipe production line |
| CN110732752A (en) * | 2018-07-20 | 2020-01-31 | 广州南洋电缆有限公司 | kinds of partial arc correcting system |
| CN111618417A (en) * | 2020-05-25 | 2020-09-04 | 浙江威泰汽配有限公司 | Port welding device of flexible piece |
-
1999
- 1999-03-29 JP JP8533599A patent/JP2000271636A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002192223A (en) * | 2000-12-26 | 2002-07-10 | Nisshin Steel Co Ltd | Manufacturing method for welded metal pipe |
| JP4557198B2 (en) * | 2000-12-26 | 2010-10-06 | 日新製鋼株式会社 | Manufacturing method of metal welded pipe |
| CN104364026A (en) * | 2012-04-13 | 2015-02-18 | 杰富意钢铁株式会社 | Device and method for producing flangeless closed-cross-section-structure component having curved shape |
| CN104364026B (en) * | 2012-04-13 | 2016-06-15 | 杰富意钢铁株式会社 | There is the manufacture method and the device that close cross section structure part without flange of curved shape |
| CN104148495A (en) * | 2014-07-10 | 2014-11-19 | 苏州鸿大金属制品有限公司 | Progressive umbrella handle copper pipe drawing die assembly |
| CN104148495B (en) * | 2014-07-10 | 2016-09-07 | 青岛橡胶谷知识产权有限公司 | Progressive umbrella handle copper pipe drawing die assembly |
| CN105598224A (en) * | 2016-02-03 | 2016-05-25 | 安徽鸿路钢结构(集团)股份有限公司 | Pre-bending process for longitudinal submerged arc welding pipe production line |
| CN110732752A (en) * | 2018-07-20 | 2020-01-31 | 广州南洋电缆有限公司 | kinds of partial arc correcting system |
| CN111618417A (en) * | 2020-05-25 | 2020-09-04 | 浙江威泰汽配有限公司 | Port welding device of flexible piece |
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