WO2010035883A1 - 異形断面への成形方法およびスポット溶接性に優れた四辺形断面成形品 - Google Patents
異形断面への成形方法およびスポット溶接性に優れた四辺形断面成形品 Download PDFInfo
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- WO2010035883A1 WO2010035883A1 PCT/JP2009/067123 JP2009067123W WO2010035883A1 WO 2010035883 A1 WO2010035883 A1 WO 2010035883A1 JP 2009067123 W JP2009067123 W JP 2009067123W WO 2010035883 A1 WO2010035883 A1 WO 2010035883A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/02—Making hollow objects characterised by the structure of the objects
- B21D51/06—Making hollow objects characterised by the structure of the objects folded objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
Definitions
- the conventional profile forming technology using hydroforming has a problem that it is difficult to obtain a molded product having a profile with a high dimensional accuracy and excellent spot weldability.
- the irregular cross section refers to a cross section such as a quadrangular cross section other than a circular form.
- a method for forming an irregular cross-section characterized in that: (4) In any one of the above (1) to (3), a modified cross-section forming method characterized by using a steel pipe having a thickness / outer diameter ratio t / D of 0.05 or less as the pipe material. (5) A quadrilateral cross-section molded product having one or two parallel two sides formed by molding a tubular material by the modified cross-section molding method according to any one of (1) to (4) above, One or two parallel 2 excellent in spot weldability, characterized in that (hollow depth on flat surface or depth of hollow on flat surface) is 0.5 mm or less, and further, the corner radius of curvature R is 10 mm or less. A quadrilateral cross-section molded product with sides.
- the tube material is a tube material having a tensile strength of 690 MPa or more, and after crushing with the deformed section mold, the tube material is deformed by continuously applying an internal pressure with the liquid.
- the maximum internal pressure is an internal pressure that satisfies both Pmin and more and more than 50 MPa, and the peripheral length increase rate after molding is A% or more and 11.0% or less below.
- A 4.167 ⁇ 10 ⁇ 3 ⁇ (TS-590)
- TS Tensile strength of pipe (MPa)
- TS Tensile strength of pipe (MPa)
- a steel pipe having a tensile strength of 780 MPa or more is used as the pipe material, and molding is performed such that the peripheral length increase rate after molding is A% or more and 10.0% or less below.
- a modified cross-section molding method characterized.
- A 4.167 ⁇ 10 ⁇ 3 ⁇ (TS-590)
- TS Tensile strength of pipe (MPa)
- (12) In combination with the internal pressure load after the crushing process, the tube end is loaded with a compressive force in the tube axis direction, and the tube end is pushed toward the center in the tube axis direction. Section forming method. (13) In the above (11) or (12), a steel pipe having a tensile strength of 780 MPa or more is used as the pipe, and the peripheral length increase rate after forming is formed to be A% or more and 10.0% or less below.
- a modified cross-section molding method characterized by the above.
- FIG. 1 is an explanatory diagram showing an outline of the method of the present invention.
- a metal tube having a tensile strength (abbreviated as TS (tensile strength)) of 590 MPa or more, for example, a steel tube is used.
- TS tensile strength
- the tube material 10 is loaded into a mold having at least one flat portion, for example, a mold 1A having a pair of upper and lower flat portions.
- the mold cross-sectional shape of the molds 1 and 1 ⁇ / b> A is a cross-sectional shape different from that of the tube material 10.
- the tube material 10 may be either preformed or not.
- the method without an internal pressure load on the pipe material includes two cases where the liquid is not contained in the pipe and the case where no internal pressure is generated by the liquid even if the liquid is contained in the pipe. .
- preparation by injecting liquid is performed while crushing.
- a recess (referred to as a flat portion recess) is formed in the tube wall portion facing the flat portion of the mold, and the tube wall portion facing the corner portion of the mold is loosely formed. Corner R is formed.
- the pipe is continuously loaded with an internal pressure that causes the maximum internal pressure to be equal to or higher than the following P min [MPa] while being clamped of upper of die and lower die, so that the pipe has a deformed cross-sectional shape. Molding is performed (FIG. 1C).
- P min 0.045 ⁇ TS (1)
- P min lower limit of maximum internal pressure [MPa]
- TS tensile strength of pipe material [MPa]
- the coefficient on the right side is 0.09 instead of 0.045, more preferably 0.12, because the shape of the molded product is further improved.
- the maximum internal pressure is usually about 100 to 200 MPa for the following reason.
- the performance of a pressure intensifier that applies internal pressure is 200 MPa at maximum.
- the projected area (or mold cavity projected area) in the horizontal plane of the molded product is excessive, it may be set to less than 200 MPa, for example, 150 MPa due to the limitation of the press force of the pressure intensifier. If there is no restriction as described above and the raw tube is thin and low in strength, sufficient straightening may be possible at 100 MPa.
- the peripheral length increase rate after molding is 2.0% or more and 10.0% or less.
- the flat portion dent amount tends to increase as the t / D increases, so that the t / D of the pipe material is 0. It is preferable to use a steel pipe of .05 or less.
- the radius of curvature R (see FIG. The definition is shown in Fig. 2.
- the specific measurement method is to cut a cross-section molded product with a plane perpendicular to the longitudinal direction, capture cross-sectional photographs of all corners in the image, and draw circles with various radii of curvature.
- the curvature radius R of all corners was obtained by overlapping the corners, and the maximum radius R was set as the corner curvature radius R.) was 10 mm or less.
- the reason why the lower limit P min [MPa] of the internal pressure (maximum internal pressure) when the internal pressure applied after crushing is maximized in the present invention is defined as the value of the above equation (1) will be described.
- the flat portion dent amount of the molded product is 0.
- the molding conditions were examined so that the corner radius of curvature R would be 10 mm or less.
- both the flat portion dent amount and the corner radius of curvature R decrease. It was found that this should be the lower limit of the maximum internal pressure.
- the relationship between this lower limit and the TS of the pipe material is as shown in FIG. 4. From FIG. 4, when TS is 590 MPa or more, the lower limit P min of the maximum internal pressure is expressed by the above formula (1).
- the flat part dent amount and the peripheral length increase rate dependency of the corner R were obtained, and the following knowledge was obtained. That is, when the maximum internal pressure after crushing is set to P min or more and the tube TS is 780 MPa or more, the flat portion dent amount is further reduced when the product peripheral length increase rate is 2.0% or more. Further, it is a finding that when the product peripheral length increase rate is 10.0% or less, the corner radius of curvature R is further reduced.
- the peripheral length increase rate after molding is 2.0 to 10.0%. It is better to mold it.
- the internal pressure used for molding after crushing is determined by finding the correspondence between the maximum internal pressure and the peripheral length increase rate by FEM (finite element method) analysis and experiment, and this correspondence corresponds to the target peripheral length increase rate. It is better to set the maximum internal pressure.
- tensile If strength is used tubing 10 above 690 MPa, as described above, maximum pressure is the by the liquid to continue tube while clamping (1) a defined P min [MPa ]
- An internal pressure satisfying both the above-described internal pressure and over 50 MPa is loaded, and molding is performed so that the peripheral length increase rate after hydroforming is not less than A% and not more than 11.0%.
- the circumference increase rate is given by the following equation.
- a flat part dent further reduces, and a corner (R material) overhangs a corner R part, and becomes a sharper (small curvature radius) R shape.
- the coefficient on the right side is 4.8 ⁇ 10 ⁇ 3 instead of 4.167 ⁇ 10 ⁇ 3 , the shape of the molded product (flat recess or corner R portion) is further improved. This is preferable.
- the material when the internal pressure is applied after crushing, the material may overhang, resulting in an excessive reduction in the thickness near the corner R.
- a compressive force in the tube axis direction is applied to the tube end and the tube end is pushed toward the center in the tube axis direction (this is referred to as “shaft pushing”). Therefore, it is possible to reduce the thickness reduction.
- the preferable condition for “shaft pushing” is to adjust the cylinder stroke (cylinder stroke) of the press machine for shaft pushing so that the push-in amount (stroke) is 0 to the length of the molded part of the final product after hydrofume processing. About 10% is preferable.
- the flat portion dent amount tends to increase as the t / D increases, so that the t / D of the pipe material is 0. It is preferable to use a steel pipe of .05 or less.
- the corner radius of curvature R decreases as the circumference increase rate increases, and the circumference increase rate when the corner radius of curvature R becomes 10 mm is the upper limit.
- the peripheral length increase rate is preferably 11.0% or less.
- the peripheral length increase rate is preferably 10.0% or less.
- a tube material having the TS and size shown in Table 1 was formed into a deformed cross section in the following steps.
- the pipe materials used were all ERW steel pipes.
- Table 2 shows the composition of the steel sheets of materials 1-33 and the manufacturing method of the steel sheets.
- the length of the steel pipe used for the Example was 300 mm.
- the steel plate 12 is placed on the upper flat portion of the product 11, and the electrode 3 is pressed against it with a constant pressure (50 to 200 Kgf) to perform one-side spot welding for each three pieces.
- a constant pressure 50 to 200 Kgf
- welding conditions energization time: 10 to 20 cycles (50 Hz), welding current: 5 to 10 KA
- Whether or not spot weldability is determined is determined by the presence or absence of nugget formation and a tensile shear test (JIS).
- JIS tensile shear test
- Z 3136 is performed with a tensile shear load, and the following two-stage evaluation of ⁇ and ⁇ is made.
- the pipe after crushing using the upper and lower molding dies, the pipe is continuously loaded with an internal pressure by a liquid, and the maximum internal pressure is in an appropriate range, more preferably, the rate of increase in peripheral length after molding is in the appropriate range.
- the tubular material can be formed into a deformed cross-sectional shape having a curvature radius R of a corner with a small flat portion dent amount and a sharp outline (small curvature radius). Since the obtained deformed cross-section molded product has a small flat portion dent amount, it is excellent in one-side spot weldability with a metal plate. Further, the deformation of the springback after unloading is suppressed, and a deformed cross-section molded product with high dimensional accuracy is obtained.
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Abstract
Description
ここで、異形断面とは円形(circular form)以外の、例えば、四辺形断面のような断面をいう。
(1)引張強さ590MPa以上の管材に、内圧を負荷しない状態もしくは液体により50MPa以下の内圧を負荷した状態で、少なくとも1つの面が平坦部を有する異形断面金型にて潰し加工を行い、引続き前記液体により最高内圧が下記Pmin[MPa]以上になる内圧を負荷して、前記管材を異形断面形状に成形することを特徴とする異形断面成形方法。
Pmin=0.045×TS
Pmin:最高内圧の下限[MPa]、TS:管材の引張強さ[MPa]
(2)前記潰し加工後の内圧負荷と併せて、管端(tube end)に管軸方向(tube axis direction)の圧縮力(compression force)を負荷して管端を管軸方向中央側に押し込むことを特徴とする上記(1)に記載の異形断面成形方法。
(3)上記(1)または(2)において、前記管材として引張強さ780MPa以上の鋼管を用い、成形後の周長増加率(increasing rate of girth)が2.0%以上10.0%以下となるように成形することを特徴とする異形断面成形方法。
(4)上記(1)~(3)のいずれかにおいて、前記管材として肉厚/外径比t/Dが0.05以下である鋼管を用いることを特徴とする異形断面成形方法。
(5)管材を上記(1)~(4)のいずれかに記載の異形断面成形方法で成形してなる一又は二の平行2辺を有する四辺形断面成形品であって、平坦部凹み量(hollow depth on flat surface or depth of hollow on flat surface)が0.5mm以下であり、さらにコーナーの曲率半径Rが10mm以下であることを特徴とするスポット溶接性に優れた一又は二の平行2辺を有する四辺形断面成形品。
(6)上記(1)において、前記管材が引張強さ690MPa以上の管材であり、前記異形断面金型にて潰し加工を行った後、引続き前記液体により内圧を負荷して、前記管材を異形断面形状に成形するにあたり、前記最高内圧が、Pmin以上および、50MPa超えの両方を満足する内圧を加え、さらに、成形後の周長増加率が下記A%以上11.0%以下となるように成形することを特徴とする異形断面成形方法。
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa)
(7)前記潰し加工後の内圧負荷と併せて、管端に管軸方向の圧縮力を負荷して管端を管軸方向中央側に押し込むことを特徴とする(6)に記載の異形断面成形方法。
(8)(6)または(7)において、前記管材として引張強さ780MPa以上の鋼管を用い、成形後の周長増加率が下記A%以上10.0%以下となるように成形することを特徴とする異形断面成形方法。
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa)
(9)(6)~(8)のいずれかにおいて、前記管材として肉厚/外径比t/Dが0.05以下である鋼管を用いることを特徴とする異形断面成形方法。
(10)管材を(6)~(9)のいずれかに記載の異形断面成形方法で成形してなる一又は二の平行2辺を有する四辺形断面成形品であって、平坦部凹み量が0.5mm以下であり、さらにコーナーの曲率半径Rが10mm以下であることを特徴とするスポット溶接性に優れた一又は二の平行2辺を有する四辺形断面成形品。
(11)引張強さ690MPa以上の管材に、内圧を負荷しない状態もしくは液体により50MPa以下の内圧を負荷した状態で、少なくとも1つの面が平坦部を有する異形断面金型にて潰し加工を行い、引続き前記液体により最高内圧が、50MPa超である内圧を負荷して、前記管材を異形断面形状に成形するにあたり、成形後の周長増加率が下記A%以上11.0%以下となるように成形することを特徴とする異形断面成形方法。
記
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa)
(12)前記潰し加工後の内圧負荷と併せて、管端に管軸方向の圧縮力を負荷して管端を管軸方向中央側に押し込むことを特徴とする前記(11)に記載の異形断面成形方法。
(13)前記(11)または(12)において、前記管材として引張強さ780MPa以上の鋼管を用い、成形後の周長増加率が下記A%以上10.0%以下となるように成形することを特徴とする異形断面成形方法。
記
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa)
(14)前記(11)~(13)のいずれかにおいて、前記管材として肉厚/外径比t/Dが0.05以下である鋼管を用いることを特徴とする異形断面成形方法。
(15)管材を前記(11)~(14)のいずれかに記載の異形断面成形方法で成形してなる一又は二の平行2辺を有する四辺形断面成形品であって、平坦部凹み量が0.5mm以下であり、さらにコーナーの曲率半径Rが10mm以下であることを特徴とするスポット溶接性に優れた一又は二の平行2辺を有する四辺形断面成形品。
記
Pmin=0.045×TS ・・・・(1)
Pmin:最高内圧の下限[MPa]、TS:管材の引張強さ[MPa]
これにより、図1(c)に示すように、平坦部凹みは低減し、コーナーR部は材料(管材の材料)が張り出し、シャープなR形状となる。また、最高内圧を高くするほど残留応力が低減し、除荷後のスプリングバックによる形状変化が小さくなる。
なお、周長増加率は次式の(2)式で与えられる。
周長増加率=(成形品の外周長/成形前の管材の外周長−1)×100(%)‥‥・・・(2)
また、潰し加工後の成形に用いる内圧は、FEM(finite element method)解析や実験により、最高内圧と周長増加率の対応関係を求めておき、この対応関係において目標の周長増加率に対応する最高内圧に設定するとよい。
記
A=4.167×10−3×(TS−590)…(4)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa)
[工程] 金型に装入→内圧無しの状態または液体により50MPa以下の内圧(No.10と11は、それぞれ 10MPa、13MPa)を負荷した状態で型締めによる潰し加工→表1に示す種々の周長増加率となるように液体により最高内圧が表1に示す値となる内圧を負荷(一部の管材には軸押しを併用(No.12と13は、それぞれ、押し込み量 2.5%、3.0%))。
[スポット溶接性の試験方法]
TSS(N)=1.85×t×TS×(1+0.0059EL)×(ND+2.09)
ただし、tは鋼板12の板厚(mm)
TSは鋼板12の引張強さ(MPa)
ELは鋼板12の伸び(%)
NDは製品11と鋼板12の間のナゲット径(nugget diameter)(mm)
鋼板12は、板厚が1.0mm以下の440MPa級以下の鋼板である。
○:スポット溶接部13にナゲット形成有(ナゲット形成の有無は断面写真から判定)、引張せん断荷重は十分(合格)
×:スポット溶接部13にナゲット形成無、もしくは、引張せん断荷重が不十分
[工程] 金型に装入→内圧無しの状態または液体により50MPa以下の内圧(No.8と9は、それぞれ10MPa、13MPa)を負荷した状態で型締めによる潰し加工→表3に示す種々の周長増加率となるように液体により50MPa超の内圧を負荷(一部の管材には軸押しを併用(No.10と11は、それぞれ、押し込み量4%、5%))。
上記測定および試験の結果を表3に示す。表3より、本発明例では、TS690MPa以上の管材からスポット溶接性に優れた高寸法精度の異形断面成形品が得られたことがわかる。なお、本発明例において、t/D≦0.05のものは、t/D>0.05のものに比べ、平坦部凹み量が小さくなっている。
1A 金型(下金型)
3 電極
10 管材
11 製品(異形断面成形品、一又は二の平行2辺を有する四辺形断面成形品)
12 鋼板
13 スポット溶接部
Claims (15)
- 引張強さ590MPa以上の管材に、内圧を負荷しない状態もしくは液体により50MPa以下の内圧を負荷した状態で、少なくとも1つの面が平坦部を有する異形断面金型にて潰し加工を行い、引続き前記液体により最高内圧が下記Pmin[MPa]以上になる内圧を負荷して、前記管材を異形断面形状に成形することを特徴とする異形断面成形方法。
記
Pmin=0.045×TS
Pmin:最高内圧の下限[MPa]、TS:管材の引張強さ[MPa] - 前記潰し加工後の内圧負荷と併せて、管端に管軸方向の圧縮力を負荷して管端を管軸方向中央側に押し込むことを特徴とする請求項1に記載の異形断面成形方法。
- 請求項1または2において、前記管材として引張強さ780MPa以上の鋼管を用い、成形後の周長増加率が2.0%以上10.0%以下となるように成形することを特徴とする異形断面成形方法。
- 請求項1~3のいずれか1項において、前記管材として肉厚/外径比t/Dが0.05以下である鋼管を用いることを特徴とする異形断面成形方法。
- 管材を請求項1~4のいずれか1項に記載の異形断面成形方法で成形してなる一又は二の平行2辺を有する四辺形断面成形品であって、平坦部凹み量が0.5mm以下であり、さらにコーナーの曲率半径Rが10mm以下であることを特徴とするスポット溶接性に優れた一又は二の平行2辺を有する四辺形断面成形品。
- 請求項1において、前記管材が引張強さ690MPa以上の管材であり、前記異形断面金型にて潰し加工を行った後、引続き前記液体により内圧を負荷して、前記管材を異形断面形状に成形するにあたり、前記最高内圧が、Pmin以上および、50MPa超えの両方を満足する内圧を加え、さらに、成形後の周長増加率が下記A%以上11.0%以下となるように成形することを特徴とする異形断面成形方法。
記
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa) - 前記潰し加工後の内圧負荷と併せて、管端に管軸方向の圧縮力を負荷して管端を管軸方向中央側に押し込むことを特徴とする請求項6に記載の異形断面成形方法。
- 請求項6または7において、前記管材として引張強さ780MPa以上の鋼管を用い、成形後の周長増加率が下記A%以上10.0%以下となるように成形することを特徴とする異形断面成形方法。
記
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa) - 請求項6~8のいずれか1項において、前記管材として肉厚/外径比t/Dが0.05以下である鋼管を用いることを特徴とする異形断面成形方法。
- 管材を請求項6~9のいずれか1項に記載の異形断面成形方法で成形してなる一又は二の平行2辺を有する四辺形断面成形品であって、平坦部凹み量が0.5mm以下であり、さらにコーナーの曲率半径Rが10mm以下であることを特徴とするスポット溶接性に優れた一又は二の平行2辺を有する四辺形断面成形品。
- 引張強さ690MPa以上の管材に、内圧を負荷しない状態もしくは液体により50MPa以下の内圧を負荷した状態で、少なくとも1つの面が平坦部を有する異形断面金型にて潰し加工を行い、引続き前記液体により最高内圧が、50MPa超である内圧を負荷して、前記管材を異形断面形状に成形するにあたり、成形後の周長増加率が下記A%以上11.0%以下となるように成形することを特徴とする異形断面成形方法。
記
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa) - 前記潰し加工後の内圧負荷と併せて、管端に管軸方向の圧縮力を負荷して管端を管軸方向中央側に押し込むことを特徴とする請求項11に記載の異形断面成形方法。
- 請求項11または12において、前記管材として引張強さ780MPa以上の鋼管を用い、成形後の周長増加率が下記A%以上10.0%以下となるように成形することを特徴とする異形断面成形方法。
記
A=4.167×10−3×(TS−590)
A:周長増加率の下限(%)、TS:管材の引張強さ(MPa) - 請求項11~13のいずれか1項において、前記管材として肉厚/外径比t/Dが0.05以下である鋼管を用いることを特徴とする異形断面成形方法。
- 管材を請求項11~14のいずれか1項に記載の異形断面成形方法で成形してなる一又は二の平行2辺を有する四辺形断面成形品であって、平坦部凹み量が0.5mm以下であり、さらにコーナーRが10mm以下であることを特徴とするスポット溶接性に優れた一又は二の平行2辺を有する四辺形断面成形品。
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CN2009801377816A CN102164690A (zh) | 2008-09-25 | 2009-09-24 | 成形为异形断面的方法及点焊性优异的四边形断面成形品 |
KR1020137017515A KR20130083492A (ko) | 2008-09-25 | 2009-09-24 | 이형 단면으로의 성형 방법 및 스폿 용접성이 우수한 사변형 단면 성형품 |
EP09816295.1A EP2351623B1 (en) | 2008-09-25 | 2009-09-24 | Method for forming deformed cross-section and formed article of quadrilateral cross-section exhibiting excellent spot weldability |
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CN102672026B (zh) * | 2012-05-28 | 2014-03-26 | 哈尔滨工业大学 | 奥氏体不锈钢管材内高压成形中抑制马氏体相变的方法 |
US9545657B2 (en) * | 2014-06-10 | 2017-01-17 | Ford Global Technologies, Llc | Method of hydroforming an extruded aluminum tube with a flat nose corner radius |
US20150315666A1 (en) | 2014-04-30 | 2015-11-05 | Ford Global Technologies, Llc | Induction annealing as a method for expanded hydroformed tube formability |
JP6670543B2 (ja) * | 2014-12-11 | 2020-03-25 | 住友重機械工業株式会社 | 成形装置及び成形方法 |
CN106311857B (zh) * | 2015-12-21 | 2017-11-07 | 青岛世冠装备科技有限公司 | 一种复杂截面中空构件低压镦胀成形方法 |
CN105562516B (zh) * | 2016-03-15 | 2018-03-30 | 哈尔滨工业大学 | 一种变截面异形管件充液压制成形方法 |
CN107243538A (zh) * | 2017-08-08 | 2017-10-13 | 天津天锻航空科技有限公司 | 一种由小周长圆管成形大周长矩形的方法 |
CN111957804B (zh) * | 2020-07-20 | 2021-06-29 | 燕山大学 | 用于薄壁管材充液弯曲成形的装置及其成形方法 |
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CN102164690A (zh) | 2011-08-24 |
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KR101322229B1 (ko) | 2013-10-28 |
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