WO2010035883A1 - Procédé de mise en forme de section transversale irrégulière et article moulé ayant une section transversale en parallélogramme et possédant d'excellentes propriétés de soudabilité par points - Google Patents

Procédé de mise en forme de section transversale irrégulière et article moulé ayant une section transversale en parallélogramme et possédant d'excellentes propriétés de soudabilité par points Download PDF

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Publication number
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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WO
WIPO (PCT)
Prior art keywords
cross
mpa
section
internal pressure
pipe
Prior art date
Application number
PCT/JP2009/067123
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English (en)
Japanese (ja)
Inventor
新宮豊久
鈴木孝司
園部治
橋本裕二
池田倫正
佐藤昭夫
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to KR1020117006739A priority Critical patent/KR101322229B1/ko
Priority to KR1020137017515A priority patent/KR20130083492A/ko
Priority to EP09816295.1A priority patent/EP2351623B1/fr
Priority to CN2009801377816A priority patent/CN102164690A/zh
Publication of WO2010035883A1 publication Critical patent/WO2010035883A1/fr

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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
    • 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.

Abstract

Dans les techniques antérieures de mise en forme de sections transversales de forme irrégulière, il était difficile d'obtenir, par soudage par points, un article moulé ayant une section transversale de forme irrégulière aux dimensions extrêmement précises. Concrètement, sur un élément tube (10) dont la résistance à la traction est supérieure ou égale à 590 MPa, soit en n'appliquant aucune pression interne, soit en appliquant une pression interne inférieure ou égale à 50 MPa grâce à un fluide, l'on réalise un usinage par écrasement sur un moule dont la section transversale est de forme irrégulière (1, 1A) et dont au moins une face possède une portion plane; puis, grâce au fluide susmentionné, par application d'une pression interne telle que la pression interne maximale devient supérieure ou égale à Pmin [MPa] mentionné ci-dessous, l'élément tube susmentionné est mis en forme avec une forme de section transversale irrégulière. Pmin= 0,045 x TS
PCT/JP2009/067123 2008-09-25 2009-09-24 Procédé de mise en forme de section transversale irrégulière et article moulé ayant une section transversale en parallélogramme et possédant d'excellentes propriétés de soudabilité par points WO2010035883A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020117006739A KR101322229B1 (ko) 2008-09-25 2009-09-24 이형 단면으로의 성형 방법 및 스폿 용접성이 우수한 사변형 단면 성형품
KR1020137017515A KR20130083492A (ko) 2008-09-25 2009-09-24 이형 단면으로의 성형 방법 및 스폿 용접성이 우수한 사변형 단면 성형품
EP09816295.1A EP2351623B1 (fr) 2008-09-25 2009-09-24 Procede de mise en forme de section transversale irreguliere et article moule ayant une section transversale en parallelogramme et possedant d'excellentes proprietes de soudabilite par points
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

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2008-246268 2008-09-25
JP2008246271 2008-09-25
JP2008246268 2008-09-25
JP2008-246271 2008-09-25

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WO2010035883A1 true WO2010035883A1 (fr) 2010-04-01

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EP (1) EP2351623B1 (fr)
KR (2) KR20130083492A (fr)
CN (1) CN102164690A (fr)
WO (1) WO2010035883A1 (fr)

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Publication number Priority date Publication date Assignee Title
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
US20150315666A1 (en) 2014-04-30 2015-11-05 Ford Global Technologies, Llc Induction annealing as a method for expanded hydroformed tube formability
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
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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JP2000246361A (ja) 1999-03-02 2000-09-12 F Tech:Kk パイプ材のハイドロフォーミング方法
JP2001096316A (ja) * 1999-09-27 2001-04-10 Nkk Corp 鋼管のハイドロフォーミング方法
JP2002220069A (ja) * 2001-01-25 2002-08-06 Mitsubishi Motors Corp 車体部材
JP2004255445A (ja) * 2003-02-27 2004-09-16 Nippon Steel Corp ハイドロフォーム加工方法及びハイドロフォーム加工用金型

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JP4631130B2 (ja) 2000-05-25 2011-02-16 住友金属工業株式会社 異形管状製品およびその製造方法
IT1320503B1 (it) * 2000-06-16 2003-12-10 Iveco Fiat Procedimento per la produzione di assali per veicoli industriali.
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JP2000246361A (ja) 1999-03-02 2000-09-12 F Tech:Kk パイプ材のハイドロフォーミング方法
JP2001096316A (ja) * 1999-09-27 2001-04-10 Nkk Corp 鋼管のハイドロフォーミング方法
JP2002220069A (ja) * 2001-01-25 2002-08-06 Mitsubishi Motors Corp 車体部材
JP2004255445A (ja) * 2003-02-27 2004-09-16 Nippon Steel Corp ハイドロフォーム加工方法及びハイドロフォーム加工用金型

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Title
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Publication number Publication date
EP2351623A4 (fr) 2012-10-31
EP2351623A1 (fr) 2011-08-03
KR20110046557A (ko) 2011-05-04
CN102164690A (zh) 2011-08-24
KR20130083492A (ko) 2013-07-22
EP2351623B1 (fr) 2016-08-17
KR101322229B1 (ko) 2013-10-28

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