JP2017030647A - Skeleton component for automobile and method for manufacturing skeleton component for automobile - Google Patents

Skeleton component for automobile and method for manufacturing skeleton component for automobile Download PDF

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JP2017030647A
JP2017030647A JP2015154709A JP2015154709A JP2017030647A JP 2017030647 A JP2017030647 A JP 2017030647A JP 2015154709 A JP2015154709 A JP 2015154709A JP 2015154709 A JP2015154709 A JP 2015154709A JP 2017030647 A JP2017030647 A JP 2017030647A
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steel plate
shaped cross
substantially hat
sectional shape
welding
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JP6299702B2 (en
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亜怜 原
Arei Hara
亜怜 原
木谷 靖
Yasushi Kitani
靖 木谷
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To reduce deformation caused by thermal strain and improve dimensional accuracy while securing sufficient peeling strength.SOLUTION: In a skeleton component for an automobile, when as for a welded position coordinate is represented by such a coordination system that an end of a contact position between a flange portion and another frame component or a panel component is 0, a flange outer end side of the flange portion is represented by (-) and a vertical wall side in a substantial hat shape is represented by (+), a position X represented by relationship of -4t≤X≤-2t (t: plate thickness of frame component of substantial hat shape) is welded by one-sided welding.SELECTED DRAWING: Figure 1

Description

本発明は、自動車用骨格部品および自動車用骨格部品の製造方法に関する。   The present invention relates to a framework component for automobiles and a method for manufacturing a framework component for automobiles.

従来から、フランジ部分を有する自動車用骨格部品の溶接には、抵抗スポット溶接が用いられている。しかし、抵抗スポット溶接は、時間がかかるという問題や、分流によって発熱量が低下するために、溶接点のピッチを狭く出来ないという問題、さらには溶接機のガンによる空間的な制約を受けるという問題があり、近年では、従来のスポット溶接に加えて、レーザ溶接を利用することが検討されている。   Conventionally, resistance spot welding has been used for welding automobile frame parts having flange portions. However, resistance spot welding has the problem that it takes time, the problem is that the pitch of the welding points cannot be narrowed because the amount of heat generation is reduced due to the diversion, and the problem that it is subject to spatial restrictions due to the gun of the welding machine. In recent years, the use of laser welding in addition to conventional spot welding has been studied.

例えば、特許文献1には、レーザ・アークハイブリッド溶接方法を用いて製造される、「断面形状が略ハット形状のフレーム部品のフランジ部と、該フランジ部に対向して配置する他のフレーム部品またはパネル部品とを溶接して閉断面を構成する自動車用骨格部品であって、溶接位置座標を、前記フランジ部と前記他のフレーム部品またはパネル部品との接触位置の端部を0とし、前記フランジ部のフランジ外端側を(−)、前記略ハット形状における縦壁側を(+)とした座標系で表し、前記略ハット形状の縦壁部とフランジ部を繋ぐ円弧状部の半径をR(mm)としたときに、下式で表される位置Xを片側溶接方法にて連続溶接してなることを特徴とする自動車用骨格部品。   For example, Patent Document 1 discloses that “a flange part of a frame part having a substantially hat-shaped cross-section and another frame part disposed opposite to the flange part, manufactured using a laser-arc hybrid welding method,” A frame part for an automobile which forms a closed section by welding a panel part, wherein the welding position coordinates are set to 0 at the end of the contact position between the flange part and the other frame part or panel part, and the flange The outer edge side of the flange is represented by a coordinate system with (−) and the vertical wall side of the substantially hat shape is represented by (+), and the radius of the arcuate portion connecting the vertical wall portion of the substantially hat shape and the flange portion is R. A framework part for an automobile, wherein the position X represented by the following formula is continuously welded by a one-side welding method when (mm).

+√(2Ra−a)≧X>1.5 ただし、R≧2 (単位:mm)
a:溶接可能な間隙量」が開示されている。
+ √ (2Ra−a 2 ) ≧ X> 1.5 where R ≧ 2 (unit: mm)
“a: Amount of gap that can be welded” is disclosed.

また、特許文献2には、「折り曲げ部、および該折り曲げ部に続くフランジを有する一の鋼板と、他の一または複数の鋼板とを前記フランジで重ね合わせ、該重ね合わせ部に、第1のレーザ溶接を行って第1のレーザ溶接部を形成し、該第1のレーザ溶接部の温度がMf点未満に低下した後に、形成された前記第1のレーザ溶接部に関して前記折り曲げ部の反対側となる前記第1のレーザ溶接部の近傍の領域に、第2のレーザ溶接を行って第2のレーザ溶接部を形成するとともに、該第2のレーザ溶接により前記第1のレーザ溶接部の熱影響部を焼き戻し処理して当該熱影響部の硬さを前記第2のレーザ溶接部の熱影響部の硬さの90%以下とすることによってレーザ溶接構造部材を製造することを特徴とするレーザ溶接構造部材の製造方法」が開示されている。   Patent Document 2 states that “one steel plate having a bent portion and a flange following the bent portion and one or more other steel plates are overlapped with the flange, and the first portion is placed on the overlap portion. Laser welding is performed to form a first laser weld, and after the temperature of the first laser weld decreases to below the Mf point, the opposite side of the bend with respect to the first laser weld formed The second laser welding is performed to form a second laser welding portion in a region in the vicinity of the first laser welding portion, and the heat of the first laser welding portion is obtained by the second laser welding. A laser-welded structural member is manufactured by tempering the affected part so that the hardness of the heat-affected part is 90% or less of the hardness of the heat-affected part of the second laser welded part. Method for manufacturing laser welded structural member There has been disclosed.

また、特許文献3には、「少なくとも一方がハット型断面形状鋼板からなる閉断面構造の衝撃吸収部材において、前記ハット型断面形状鋼板のフランジ部の長手方向に沿って断続的に形成された溶接ビードの1箇所当たりの溶接長Lと溶接ピッチλの比(L/λ)が0.2以上0.95以下であり、かつ前記フランジ部の重ね合わせ面での溶融幅Wと板厚tの比(W/t)が1.0以上、3.0以下であることを特徴とする衝撃吸収特性に優れた衝撃吸収部材」が開示されている。   Patent Document 3 states that “welding formed intermittently along the longitudinal direction of the flange portion of the hat-shaped cross-sectional steel plate in a shock-absorbing member having a closed cross-sectional structure made of a steel plate having a hat-shaped cross-sectional shape. The ratio (L / λ) of the weld length L to the weld pitch λ per one place of the bead is 0.2 or more and 0.95 or less, and the melt width W and the plate thickness t on the overlapping surface of the flange portion An impact-absorbing member excellent in impact-absorbing characteristics characterized in that the ratio (W / t) is 1.0 or more and 3.0 or less is disclosed.

特開2012−240118号公報JP2012-240118A 特開2010−12504号公報JP 2010-12504 A 特開2006−142917号公報JP 2006-142917 A

しかしながら、特許文献1では、略ハット形状のフランジ部と、他の部品とが接触していない部分を連続溶接するため、入熱量が多くなって熱歪が大きくなり、寸法精度が落ちるという問題がある。   However, in patent document 1, since the substantially hat-shaped flange part and the part which the other components are not contacting are continuously welded, there is a problem that the amount of heat input increases, thermal distortion increases, and dimensional accuracy decreases. is there.

また、特許文献3は、衝撃吸収特性に着目したものであり、はく離強度については何ら考慮されていない。そのため、特許文献3の範囲を満たす部品であっても、十分なはく離強度を得ることができないという問題がある。   Patent Document 3 focuses on shock absorption characteristics, and does not consider any peeling strength. Therefore, there is a problem that even a part satisfying the range of Patent Document 3 cannot obtain a sufficient peel strength.

本発明は、このような問題点に対してなされたものであり、十分なはく離強度を確保しながら、熱歪による変形を低減させて寸法精度を向上させることができる自動車用骨格部品および自動車用骨格部品の製造方法を提供することを目的とする。   The present invention has been made with respect to such problems, and it is possible to reduce the deformation due to thermal strain and improve the dimensional accuracy by securing sufficient peeling strength, and the skeletal component for an automobile and the automobile. It aims at providing the manufacturing method of frame parts.

本発明は、上記のような目的を達成するために、以下のような特徴を有している。
[1] 一方が略ハット型断面形状の鋼板であり、他方が略ハット型断面形状の鋼板またはパネル形状の鋼板であり、前記一方の略ハット型断面形状の鋼板のフランジ部と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板とを重ね合わせて溶接することで閉断面が構成された自動車用骨格部品であって、
一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板との接触部の閉断面側の端部を0とし、前記フランジ部のフランジ外端側を(−)、前記一方の略ハット型断面形状の鋼板の略ハット形状における縦壁側を(+)とした座標系で表したときに、溶接位置座標が下式で表される位置Xにおいて片側溶接にて溶接されており、
前記フランジ部の長手方向に沿って断続的に形成された溶接ビードにおける、溶接ピッチλに対する1箇所当たりの溶接長lの比(l/λ)が0.4以上0.7未満であり、かつ、前記一方の略ハット型断面形状の鋼板の板厚tに対する前記フランジ部の重ね合わせ面での溶融幅wの比(w/t)が0.3以上かつ1.0以下である自動車用骨格部品。
−4t≦X≦−2t
ただし、tは、一方の略ハット型断面形状の鋼板の板厚であり、t≦2.0 (単位:mm)をみたす。
[2] 一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板は、引張強度が980MPa以上である板厚1.0〜2.0mmの高張力鋼板であり、成分組成が、質量%で、0.07%<C≦0.25%、P+S<0.03%、Mn≧1.8%、Si>1.2%を満たす[1]に記載の自動車用骨格部品。
[3] 一方が略ハット型断面形状の鋼板であり、他方が略ハット型断面形状の鋼板またはパネル形状の鋼板であり、前記一方の略ハット型断面形状の鋼板のフランジ部と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板とを重ね合わせて溶接することで閉断面が構成された自動車用骨格部品の製造方法であって、
一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板との接触部の閉断面側の端部を0とし、前記フランジ部のフランジ外端側を(−)、前記一方の略ハット型断面形状の鋼板の略ハット形状における縦壁側を(+)とした座標系で表したときに、溶接位置座標が下式で表される位置Xを片側溶接にて溶接し、
前記フランジ部の長手方向に沿って断続的に溶接ビードを形成し、
溶接ピッチλに対する1箇所当たりの溶接長lの比(l/λ)が0.4以上0.7未満であり、かつ、前記一方の略ハット型断面形状の鋼板の板厚tに対する前記フランジ部の重ね合わせ面での溶融幅wの比(w/t)が0.3以上かつ1.0以下となるように溶接する自動車用骨格部品の製造方法。
−4t≦X≦−2t
ただし、tは、一方の略ハット型断面形状の鋼板の板厚であり、t≦2.0 (単位:mm)をみたす。
[4] 一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板は、引張強度が980MPa以上である板厚1.0〜2.0mmの高張力鋼板であり、成分組成が、質量%で、0.07%<C≦0.25%、P+S<0.03%、Mn≧1.8%、Si>1.2%を満たす[3]に記載の自動車用骨格部品の製造方法。
In order to achieve the above object, the present invention has the following features.
[1] One is a steel plate having a substantially hat-shaped cross-sectional shape, the other is a steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape, the flange portion of the one steel plate having a substantially hat-shaped cross-sectional shape, and the other approximately A frame part for an automobile in which a closed cross-section is configured by overlapping and welding a hat-shaped cross-sectional steel sheet or a panel-shaped steel sheet,
The end on the closed cross section side of the contact portion between one steel plate having a substantially hat-shaped cross-sectional shape and the other steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape is defined as 0, and the flange outer end side of the flange portion is defined as ( -) When the vertical wall side of the substantially hat-shaped steel plate having the substantially hat-shaped cross-section is represented by a coordinate system with (+) as the welding position coordinates, one-side welding is performed at a position X represented by the following equation. Welded with
In a weld bead formed intermittently along the longitudinal direction of the flange portion, the ratio (l / λ) of the weld length l per location to the weld pitch λ is 0.4 or more and less than 0.7, and The framework for automobiles in which the ratio (w / t) of the melt width w at the overlapping surface of the flange portion to the thickness t of the steel plate having the substantially hat-shaped cross section is 0.3 or more and 1.0 or less. parts.
−4t ≦ X ≦ −2t
However, t is the plate | board thickness of one substantially hat-shaped cross-section steel plate, and satisfies t <= 2.0 (unit: mm).
[2] One steel plate having a substantially hat-shaped cross section and the other steel plate having a substantially hat-shaped cross section or a panel-shaped steel plate are high-tensile steel plates having a tensile strength of 980 MPa or more and a thickness of 1.0 to 2.0 mm. The component composition is 0.07% <C ≦ 0.25%, P + S <0.03%, Mn ≧ 1.8%, and Si> 1.2% in mass%, according to [1] Automotive framework parts.
[3] One is a steel plate having a substantially hat-shaped cross-sectional shape, and the other is a steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape. A manufacturing method of a framework part for an automobile in which a closed cross-section is configured by superimposing and welding a hat-shaped cross-sectional steel sheet or a panel-shaped steel sheet,
The end on the closed cross section side of the contact portion between one steel plate having a substantially hat-shaped cross-sectional shape and the other steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape is defined as 0, and the flange outer end side of the flange portion is defined as ( -) When the vertical wall side of the substantially hat-shaped steel plate having the substantially hat-shaped cross-sectional shape is represented by a coordinate system with (+), the position X where the welding position coordinates are represented by the following equation is welded on one side. Welding with
Forming a weld bead intermittently along the longitudinal direction of the flange,
The flange portion with respect to the plate thickness t of the steel plate having the substantially hat-shaped cross-section, wherein the ratio (l / λ) of the welding length l per place to the welding pitch λ is 0.4 or more and less than 0.7. The manufacturing method of the frame component for motor vehicles which welds so that ratio (w / t) of the fusion | melting width w in the superimposition surface may become 0.3 or more and 1.0 or less.
−4t ≦ X ≦ −2t
However, t is the plate | board thickness of one substantially hat-shaped cross-section steel plate, and satisfies t <= 2.0 (unit: mm).
[4] One steel plate having a substantially hat-shaped cross-section and the other steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape are high-tensile steel plates having a tensile strength of 980 MPa or more and a thickness of 1.0 to 2.0 mm. The component composition is 0.07% <C ≦ 0.25%, P + S <0.03%, Mn ≧ 1.8%, and Si> 1.2% in mass%, according to [3] Manufacturing method for automotive framework parts.

本発明によれば、自動車用骨格部品の十分なはく離強度を確保しながら、熱歪による変形を低減させて寸法精度を向上させることができる。   ADVANTAGE OF THE INVENTION According to this invention, while ensuring sufficient peeling strength of the frame | skeleton component for motor vehicles, the deformation | transformation by a thermal strain can be reduced and a dimensional accuracy can be improved.

本発明の実施の形態に係る自動車用骨格部品を示す斜視図である。It is a perspective view which shows the frame component for motor vehicles based on embodiment of this invention. 本発明の実施の形態に係る自動車用骨格部品の溶接ビード周辺を示す断面図である。It is sectional drawing which shows the welding bead periphery of the frame component for motor vehicles based on embodiment of this invention. 本発明の実施の形態に係る自動車用骨格部品の一部の平面図である。1 is a plan view of a part of an automobile skeleton component according to an embodiment of the present invention. 実施例におけるはく離試験片を示す図である。It is a figure which shows the peeling test piece in an Example. 実施例における溶接ピッチλと溶接長lとの関係を示す図である。It is a figure which shows the relationship between the welding pitch (lambda) and the welding length l in an Example.

以下、添付した図面を参照して、本発明の実施の形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図1は、本発明の実施の形態に係る自動車用骨格部品の構成を示す斜視図である。   FIG. 1 is a perspective view showing a configuration of an automotive framework component according to an embodiment of the present invention.

本発明に係る自動車用骨格部品は、略ハット型断面形状の鋼板1とパネル形状の鋼板2を有している。略ハット型断面形状の鋼板1は、縦壁部1aとフランジ部1bを有している。略ハット型断面形状の鋼板1のフランジ部1bとパネル形状の鋼板2とを重ね合わせ、重ね合わせた場所に、フランジ部1bの長手方向に沿って断続的にレーザ10を照射することで、直線状の溶接ビード3をフランジ部1bの長手方向に沿って断続的に形成する。略ハット型断面形状の鋼板1とパネル形状の鋼板2とで閉断面が構成される。   The automobile frame component according to the present invention includes a steel plate 1 having a substantially hat-shaped cross section and a steel plate 2 having a panel shape. The steel plate 1 having a substantially hat-shaped cross section has a vertical wall portion 1a and a flange portion 1b. The flange portion 1b of the steel plate 1 having a substantially hat-shaped cross section and the panel-shaped steel plate 2 are overlapped, and the laser 10 is intermittently irradiated along the longitudinal direction of the flange portion 1b to the overlapped portion, thereby generating a straight line. The weld bead 3 is formed intermittently along the longitudinal direction of the flange portion 1b. The steel plate 1 having a substantially hat-shaped cross section and the steel plate 2 having a panel shape form a closed cross section.

図2は、本発明の実施の形態に係る自動車用骨格部品の溶接ビード周辺を示す断面図である。本発明に係る自動車用骨格部品は、溶接位置座標を、略ハット型断面形状の鋼板1とパネル形状の鋼板2との接触部の閉断面側の端部を0とし、フランジ部1bのフランジ外端側を(−)、略ハット形状における縦壁部1a側を(+)とした座標系で表したときに、下式で表される位置Xが片側溶接方法にて溶接されている。
−4t≦X≦−2t
ただし、tは、略ハット型断面形状の鋼板1の板厚であり、t≦2.0 (単位:mm)をみたす。
FIG. 2 is a cross-sectional view showing the periphery of the weld bead of the automobile frame component according to the embodiment of the present invention. In the skeletal component for automobiles according to the present invention, the welding position coordinates are set to 0 on the closed cross-section side end portion of the contact portion between the steel plate 1 having a substantially hat-shaped cross section and the steel plate 2 having a panel shape. When expressed in a coordinate system in which the end side is (−) and the vertical wall portion 1a side in the substantially hat shape is (+), the position X represented by the following formula is welded by a one-side welding method.
−4t ≦ X ≦ −2t
However, t is the plate | board thickness of the steel plate 1 of substantially hat-shaped cross-sectional shape, and satisfies t <= 2.0 (unit: mm).

溶接位置Xを、上式のように設定した理由は以下の通りである。   The reason why the welding position X is set as in the above equation is as follows.

溶接位置Xを−2tよりも、略ハット型断面形状の鋼板1とパネル形状の鋼板2との接触部の閉断面側の端部(0)に近づけると、L字引張試験の際に、溶接ビード3部分より破断し、はく離強度も低くなる。   When the welding position X is closer to the end (0) on the closed cross-section side of the contact portion between the steel plate 1 having a substantially hat-shaped cross section and the steel plate 2 having a panel shape than -2t, welding is performed during the L-shaped tensile test. It breaks from the bead 3 part, and the peel strength also becomes low.

一方、溶接位置Xを−4tよりも略ハット型断面形状の鋼板1とパネル形状の鋼板2との閉断面側の接触部の端部(0)から遠ざけると、溶接ビード3にかかるモーメントが大きくなり、はく離強度が低くなる。   On the other hand, if the welding position X is moved away from the end (0) of the contact portion on the closed cross section side between the steel plate 1 having a substantially hat-shaped cross section and the steel plate 2 having a panel shape rather than −4t, the moment applied to the weld bead 3 increases. And peeling strength is lowered.

そのため、溶接位置Xを、−4t≦X≦−2tと規定した。   Therefore, the welding position X is defined as −4t ≦ X ≦ −2t.

さらに、本発明に係る自動車用骨格部品は、溶接ビード3における、溶接ピッチλに対する1箇所当たりの溶接長lの比(l/λ)が0.4以上0.7未満であり、かつ、略ハット型断面形状の鋼板1のフランジ部1bの板厚tに対する略ハット型断面形状の鋼板1の重ね合わせ面での溶融幅w(図2)の比(w/t)が0.3以上かつ1.0以下となるように溶接ビード3が形成されている。   Further, in the automobile frame component according to the present invention, the ratio (l / λ) of the weld length l per one place to the weld pitch λ in the weld bead 3 is 0.4 or more and less than 0.7, and is substantially The ratio (w / t) of the melt width w (FIG. 2) at the overlap surface of the steel plate 1 having a substantially hat-shaped cross-section to the plate thickness t of the flange portion 1b of the steel plate 1 having the hat-shaped cross-sectional shape is 0.3 or more and The weld bead 3 is formed so as to be 1.0 or less.

なお、図3に示すように、溶接ピッチλは、隣接する溶接ビード3の長手方向の中心間の距離であり、溶接長lは、溶接ビード3の長手方向の長さである。   As shown in FIG. 3, the welding pitch λ is the distance between the centers of the adjacent weld beads 3 in the longitudinal direction, and the weld length l is the length of the weld beads 3 in the longitudinal direction.

溶接ピッチλに対する1箇所当たりの溶接長lの比(l/λ)を、上述のように設定した理由は以下の通りである。   The reason why the ratio (l / λ) of the welding length l per place to the welding pitch λ is set as described above is as follows.

溶接ピッチλに対する1箇所当たりの溶接長lの比(l/λ)が小さい方が、熱歪による変形を評価するための指標となる角変形(縦壁部1aとフランジ部1bのなす角の溶接前後の変化量)の抑制の観点からは有利である。そのため、この効果を十分に得るために、上限値を0.7未満とした。しかしながら、はく離強度を確保するために最低限必要な溶接長lが決まっているため、その溶接長lに対応する値(0.4)を下限とした。   The smaller the ratio (l / λ) of the welding length l per spot to the welding pitch λ is, the angular deformation (the angle formed by the vertical wall portion 1a and the flange portion 1b) becomes an index for evaluating deformation due to thermal strain. This is advantageous from the viewpoint of suppressing the amount of change before and after welding. Therefore, in order to sufficiently obtain this effect, the upper limit value is set to less than 0.7. However, since the minimum weld length l required to ensure the peel strength is determined, the value (0.4) corresponding to the weld length l is set as the lower limit.

略ハット型断面形状の鋼板1の板厚tに対するフランジ部1bの重ね合わせ面での溶融幅wの比(w/t)を上述のように設定した理由は以下の通りである。   The reason why the ratio (w / t) of the melt width w at the overlapping surface of the flange portion 1b to the plate thickness t of the steel plate 1 having a substantially hat-shaped cross section is set as described above is as follows.

略ハット型断面形状の鋼板1の板厚tに対する重ね合わせ面での溶融幅wの比(w/t)が0.3未満の場合には、溶接ビード3の強度が不足して引張試験中に溶接ビード3で破断し、十分なはく離強度が確保できない。一方、略ハット型断面形状の鋼板1の板厚tに対する略ハット型断面形状の鋼板1の重ね合わせ面での溶融幅wの比(w/t)が1.0を超える場合には、角変形が大きくなって寸法精度が低下し、部品外観の点でも不良と判断される。   When the ratio (w / t) of the melt width w at the overlap surface to the plate thickness t of the steel plate 1 having a substantially hat-shaped cross-sectional shape is less than 0.3, the strength of the weld bead 3 is insufficient and the tensile test is in progress. In addition, the weld bead 3 breaks and a sufficient peel strength cannot be ensured. On the other hand, when the ratio (w / t) of the melt width w at the overlapping surface of the steel plate 1 having a substantially hat-shaped cross-section to the thickness t of the steel plate 1 having a substantially hat-shaped cross-sectional shape exceeds 1.0, The deformation becomes large and the dimensional accuracy is lowered, and it is judged that the part is also defective in terms of the appearance of the part.

このように、本発明では、溶接位置座標を、上記のような位置Xとなるように片側溶接を行い、溶接ピッチλ、溶接長lおよび溶融幅wを所定の範囲とすることで、十分なはく離強度を確保しながら、熱歪による変形を低減して寸法精度を向上させることができる。   As described above, in the present invention, it is sufficient to perform one-side welding so that the welding position coordinates are set to the position X as described above, and the welding pitch λ, the welding length l, and the melting width w are set within a predetermined range. While ensuring the peel strength, deformation due to thermal strain can be reduced and dimensional accuracy can be improved.

なお、本発明を適用する略ハット形状のフレーム部品1と、パネル形状の鋼板2は、いずれも、引張強度が980MPa以上である板厚1.0〜2.0mmの高張力鋼板であり、成分組成が、質量%で、0.07%<C≦0.25%、P+S<0.03%、Mn≧1.8%、Si>1.2%を満たし、残部がFeおよび不可避的不純物であることが好ましい。なお、必要に応じて、Cu、Ni、Cr、Mo、Nb、V、Ti、Alなどの添加元素を加えてもよい。   Both the substantially hat-shaped frame component 1 and the panel-shaped steel plate 2 to which the present invention is applied are high-tensile steel plates having a tensile strength of 980 MPa or more and a plate thickness of 1.0 to 2.0 mm. The composition is 0.07% <C ≦ 0.25%, P + S <0.03%, Mn ≧ 1.8%, Si> 1.2% by mass%, the balance being Fe and inevitable impurities Preferably there is. If necessary, additional elements such as Cu, Ni, Cr, Mo, Nb, V, Ti, and Al may be added.

以下に、各成分の限定理由を述べる。なお、成分組成の説明における「%」は、質量%を示すものとする。
[0.07%<C≦0.25%]
Cは、微細な炭化物を形成し、析出強化(分散強化)により鋼板の強度を増加させる作用を有する元素である。このような効果を得て、所望の高強度を確保するためには、0.07%以上の含有を必要とする。一方、0.25%を超える含有は、粗大な炭化物の析出を招き、所望の高強度および加工性を確保できなくなる。
[P+S<0.03%]
Pは、偏析傾向が強く、多量の含有は延靭性の低下を招く。Sは、Mn、Ti等と結合し、鋼中では硫化物として存在し、多量の含有は同じく延靭性の低下を招く。したがって、本発明では、PおよびSは、できるだけ低減することが好ましいが、精錬コストの高騰を招くため、P+S<0.03%とする。
[Mn≧1.8%]
Mnは、固溶して鋼板の強度を増加させるとともに、γ→α変態点を低下させ、焼入れ性を向上させる作用を有する元素である。γ→α変態点が低温である場合には、巻き取り前には炭化物の析出が抑制され、微細炭化物を析出させることができる。このような効果を確保するためには、1.8%以上の含有を必要とする。
[Si>1.2%]
Siは、固溶して、鋼板の強度を増加する作用を有する元素であり、このような効果を確保するためには、1.2%より多く含有することを要する。
The reasons for limiting each component will be described below. In the description of the component composition, “%” represents mass%.
[0.07% <C ≦ 0.25%]
C is an element that has the effect of forming fine carbides and increasing the strength of the steel sheet by precipitation strengthening (dispersion strengthening). In order to obtain such an effect and ensure a desired high strength, the content of 0.07% or more is required. On the other hand, if the content exceeds 0.25%, coarse carbides precipitate, and the desired high strength and workability cannot be ensured.
[P + S <0.03%]
P has a strong segregation tendency, and a large amount causes a reduction in ductility. S combines with Mn, Ti, etc., and exists as a sulfide in the steel, and a large amount also causes a reduction in ductility. Therefore, in the present invention, it is preferable to reduce P and S as much as possible, but in order to increase the refining cost, P + S <0.03%.
[Mn ≧ 1.8%]
Mn is an element having a function of increasing the strength of the steel sheet by solid solution and decreasing the γ → α transformation point and improving the hardenability. When the γ → α transformation point is a low temperature, precipitation of carbides is suppressed before winding and fine carbides can be precipitated. In order to ensure such an effect, the content of 1.8% or more is required.
[Si> 1.2%]
Si is an element having an effect of increasing the strength of the steel sheet by solid solution, and in order to secure such an effect, it is necessary to contain more than 1.2%.

本発明は、自動車用骨格部品のうちセンターピラーに適用することが好ましい。センターピラーでは、はく離強度を確保することが重要であり、本発明をセンターピラーに適用することで、十分なはく離強度を有するセンターピラーを提供することができる。   The present invention is preferably applied to a center pillar among automotive framework parts. In the center pillar, it is important to ensure the peeling strength. By applying the present invention to the center pillar, a center pillar having a sufficient peeling strength can be provided.

また、上述では、略ハット型断面形状の鋼板1とパネル形状の鋼板2とを溶接して自動車用骨格部品を構成するとして説明したが、略ハット型断面形状の鋼板1を2つ用意し、2つの略ハット型断面形状の鋼板1のフランジ部1b同士を重ね合わせた自動車用骨格部品としてもよい。   Further, in the above description, the steel plate 1 having a substantially hat-shaped cross section and the steel plate 2 having a panel shape are welded to form an automobile skeleton component. It is good also as the frame | skeleton components for motor vehicles which piled up the flange parts 1b of the steel plates 1 of two substantially hat type cross-sectional shapes.

引張強さが980MPaクラス、1180MPaクラス、板厚が1.2mm、1.6mm、1.8mmである鋼板を用い、図4に示すように、L字の断面形状に曲げ加工を施した。L字の鋼板8は、長辺8aと短辺8bを有しており、長辺8aが自動車用骨格部品の略ハット型断面形状の鋼板1の縦壁部1aに相当し、短辺8bがフランジ部1bに相当している。同じ鋼種・同じ板厚のL字の鋼板8を、短辺8b同士で重ね合わせた後、重ね合わせた部分を長手方向に断続的にレーザ溶接して溶接ビード3を形成し、試験片を作製した。L字の鋼板8は、幅100mm、長辺8aの長さ120mm、短辺8bの長さ30mmである。   Using a steel plate having a tensile strength of 980 MPa class, 1180 MPa class, and plate thicknesses of 1.2 mm, 1.6 mm, and 1.8 mm, the L-shaped cross-sectional shape was bent as shown in FIG. The L-shaped steel plate 8 has a long side 8a and a short side 8b, and the long side 8a corresponds to the vertical wall portion 1a of the steel plate 1 having a substantially hat-shaped cross-sectional shape of an automotive framework component, and the short side 8b It corresponds to the flange portion 1b. After superposing L-shaped steel plates 8 of the same steel type and the same thickness at the short sides 8b, the overlapped portions are intermittently laser welded in the longitudinal direction to form a weld bead 3 to produce a test piece. did. The L-shaped steel plate 8 has a width of 100 mm, a long side 8a of 120 mm in length, and a short side 8b of 30 mm in length.

レーザ溶接により形成する溶接ビードの条件を、表1に示す。溶接位置座標を、試験片のフランジ部同士の接触部の縦壁部1a側の端部を0とし、試験片のフランジ外端側を(−)、試験片における縦壁側を(+)とした座標系で表した時の溶接位置をX、溶接ピッチλに対する1箇所当たりの溶接長lの比をl/λ、L字の鋼板8の板厚tに対するL字の鋼板8の重ね合わせ面での溶融幅wの比をw/tとし、それぞれの値を種々変えて試験を行った。図5に、実施例における溶接ピッチλと溶接長lとの関係を示す。   Table 1 shows the conditions of the weld bead formed by laser welding. The welding position coordinates are 0 for the end of the contact portion between the flange portions of the test piece on the vertical wall portion 1a side, (−) for the flange outer end side of the test piece, and (+) for the vertical wall side of the test piece. The welding position when expressed in the coordinate system is X, the ratio of the welding length l per spot to the welding pitch λ is 1 / λ, and the L-shaped steel plate 8 overlap surface with the plate thickness t of the L-shaped steel plate 8 The ratio of the melt width w was set to w / t, and the test was performed by changing each value. FIG. 5 shows the relationship between the welding pitch λ and the welding length l in the example.

なお、溶融幅wは、L字の鋼板8の鋼板重ね合わせ面における複数の溶接ビード3の幅の平均値を示し、溶接後に、溶接ビード3周辺の断面観察をして測定した。   The melt width w is an average value of the widths of the plurality of weld beads 3 on the steel plate overlapping surface of the L-shaped steel plate 8, and was measured by observing a cross section around the weld beads 3 after welding.

レーザ溶接にはファイバーレーザを用いた。レーザ溶接では、レーザ出力、上側のL字の鋼板表面(8b)でのビーム直径、および溶接速度を調節し、溶接ビード3の溶融幅wを調整した。溶接は大気中で行った。   A fiber laser was used for laser welding. In laser welding, the laser output, the beam diameter on the upper L-shaped steel plate surface (8b), and the welding speed were adjusted, and the melt width w of the weld bead 3 was adjusted. Welding was performed in air.

表1に、引張試験および角変形の計測結果を示す。また、表1の鋼の化学組成を表2に示す。   Table 1 shows the measurement results of the tensile test and the angular deformation. Table 2 shows the chemical composition of the steels in Table 1.

なお、引張試験は10mm/minの速度で行い、角変形の計測はレーザ変位計で溶接後の鋼板の変形量を計測し、試験片寸法より角度(図4における溶接前と溶接後の角度θの変化量[rad])に換算して行った。   The tensile test is performed at a speed of 10 mm / min, and the angular deformation is measured by measuring the amount of deformation of the steel sheet after welding with a laser displacement meter. The angle is determined from the specimen size (the angle θ before and after welding in FIG. 4). The amount of change in [rad]) was converted.

板厚1.6mmの試験片では、No.4の試験片のはく離強度、角変形量を基準とし、この基準値に対するはく離強度が10%以上低い、もしくは角変形量が10%より多いものを「NG」とした。   For a test piece with a plate thickness of 1.6 mm, No. The peel strength and angular deformation amount of the test piece No. 4 were used as references, and “NG” was given when the peel strength with respect to this reference value was 10% or more lower or the angular deformation amount was more than 10%.

板厚1.2mmの試験片では、No.16の試験片のはく離強度、角変形量を基準とし、この基準値に対するはく離強度が10%以上低い、もしくは角変形量が10%より多いものを「NG」とした。   For a test piece having a thickness of 1.2 mm, No. The peel strength and angular deformation amount of the 16 test pieces were used as references, and “NG” was given when the peel strength with respect to this reference value was 10% or more lower or the angular deformation amount was more than 10%.

板厚1.8mmの試験片では、No.21の試験片のはく離強度、角変形量を基準とし、この基準値に対するはく離強度が10%以上低い、もしくは角変形量が10%より多いものを「NG」とした。   For a test piece having a thickness of 1.8 mm, No. Based on the peel strength and the amount of angular deformation of 21 test pieces, those having a peel strength lower than 10% or more than 10% with respect to the reference value or having an angular deformation amount of more than 10% were defined as “NG”.

Figure 2017030647
Figure 2017030647

Figure 2017030647
Figure 2017030647

1 略ハット型断面形状の鋼板
1a 縦壁部
1b フランジ部
2 パネル形状の鋼板
3 溶接ビード
8 L字の鋼板
8a 長辺
8b 短辺
DESCRIPTION OF SYMBOLS 1 Steel plate of substantially hat type cross-sectional shape 1a Vertical wall part 1b Flange part 2 Panel-shaped steel plate 3 Weld bead 8 L-shaped steel plate 8a Long side 8b Short side

Claims (4)

一方が略ハット型断面形状の鋼板であり、他方が略ハット型断面形状の鋼板またはパネル形状の鋼板であり、前記一方の略ハット型断面形状の鋼板のフランジ部と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板とを重ね合わせて溶接することで閉断面が構成された自動車用骨格部品であって、
一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板との接触部の閉断面側の端部を0とし、前記フランジ部のフランジ外端側を(−)、前記一方の略ハット型断面形状の鋼板の略ハット形状における縦壁側を(+)とした座標系で表したときに、溶接位置座標が下式で表される位置Xにおいて片側溶接にて溶接されており、
前記フランジ部の長手方向に沿って断続的に形成された溶接ビードにおける、溶接ピッチλに対する1箇所当たりの溶接長lの比(l/λ)が0.4以上0.7未満であり、かつ、前記一方の略ハット型断面形状の鋼板の板厚tに対する前記フランジ部の重ね合わせ面での溶融幅wの比(w/t)が0.3以上かつ1.0以下である自動車用骨格部品。
−4t≦X≦−2t
ただし、tは、一方の略ハット型断面形状の鋼板の板厚であり、t≦2.0 (単位:mm)をみたす。
One is a steel plate having a substantially hat-shaped cross-sectional shape, the other is a steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape, the flange portion of the steel plate having the one substantially hat-shaped cross-sectional shape, and the other substantially hat-shaped cross-section. It is a framework component for automobiles in which a closed cross section is configured by overlapping and welding a shape steel plate or a panel shape steel plate,
The end on the closed cross section side of the contact portion between one steel plate having a substantially hat-shaped cross-sectional shape and the other steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape is defined as 0, and the flange outer end side of the flange portion is defined as ( -) When the vertical wall side of the substantially hat-shaped steel plate having the substantially hat-shaped cross-section is represented by a coordinate system with (+) as the welding position coordinates, one-side welding is performed at a position X represented by the following equation. Welded with
In a weld bead formed intermittently along the longitudinal direction of the flange portion, the ratio (l / λ) of the weld length l per location to the weld pitch λ is 0.4 or more and less than 0.7, and The framework for automobiles in which the ratio (w / t) of the melt width w at the overlapping surface of the flange portion to the thickness t of the steel plate having the substantially hat-shaped cross section is 0.3 or more and 1.0 or less. parts.
−4t ≦ X ≦ −2t
However, t is the plate | board thickness of one substantially hat-shaped cross-section steel plate, and satisfies t <= 2.0 (unit: mm).
一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板は、引張強度が980MPa以上である板厚1.0〜2.0mmの高張力鋼板であり、成分組成が、質量%で、0.07%<C≦0.25%、P+S<0.03%、Mn≧1.8%、Si>1.2%を満たす請求項1に記載の自動車用骨格部品。   One steel plate having a substantially hat-shaped cross-sectional shape and the other steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape are high-tensile steel plates having a tensile strength of 980 MPa or more and a thickness of 1.0 to 2.0 mm. The composition for an automobile according to claim 1, wherein the component composition satisfies 0.07% <C ≦ 0.25%, P + S <0.03%, Mn ≧ 1.8%, and Si> 1.2% by mass%. Skeletal parts. 一方が略ハット型断面形状の鋼板であり、他方が略ハット型断面形状の鋼板またはパネル形状の鋼板であり、前記一方の略ハット型断面形状の鋼板のフランジ部と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板とを重ね合わせて溶接することで閉断面が構成された自動車用骨格部品の製造方法であって、
一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板との接触部の閉断面側の端部を0とし、前記フランジ部のフランジ外端側を(−)、前記一方の略ハット型断面形状の鋼板の略ハット形状における縦壁側を(+)とした座標系で表したときに、溶接位置座標が下式で表される位置Xを片側溶接にて溶接し、
前記フランジ部の長手方向に沿って断続的に溶接ビードを形成し、
溶接ピッチλに対する1箇所当たりの溶接長lの比(l/λ)が0.4以上0.7未満であり、かつ、前記一方の略ハット型断面形状の鋼板の板厚tに対する前記フランジ部の重ね合わせ面での溶融幅wの比(w/t)が0.3以上かつ1.0以下となるように溶接する自動車用骨格部品の製造方法。
−4t≦X≦−2t
ただし、tは、一方の略ハット型断面形状の鋼板の板厚であり、t≦2.0 (単位:mm)をみたす。
One is a steel plate having a substantially hat-shaped cross-sectional shape, the other is a steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape, the flange portion of the steel plate having the one substantially hat-shaped cross-sectional shape, and the other substantially hat-shaped cross-section. A method of manufacturing a framework component for an automobile in which a closed cross section is configured by overlapping and welding a shape steel plate or a panel shape steel plate,
The end on the closed cross section side of the contact portion between one steel plate having a substantially hat-shaped cross-sectional shape and the other steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape is defined as 0, and the flange outer end side of the flange portion is defined as ( -) When the vertical wall side of the substantially hat-shaped steel plate having the substantially hat-shaped cross-sectional shape is represented by a coordinate system with (+), the position X where the welding position coordinates are represented by the following equation is welded on one side. Welding with
Forming a weld bead intermittently along the longitudinal direction of the flange,
The flange portion with respect to the plate thickness t of the steel plate having the substantially hat-shaped cross-section, wherein the ratio (l / λ) of the welding length l per place to the welding pitch λ is 0.4 or more and less than 0.7. The manufacturing method of the frame component for motor vehicles which welds so that ratio (w / t) of the fusion | melting width w in the superimposition surface may become 0.3 or more and 1.0 or less.
−4t ≦ X ≦ −2t
However, t is the plate | board thickness of one substantially hat-shaped cross-section steel plate, and satisfies t <= 2.0 (unit: mm).
一方の略ハット型断面形状の鋼板と、他方の略ハット型断面形状の鋼板またはパネル形状の鋼板は、引張強度が980MPa以上である板厚1.0〜2.0mmの高張力鋼板であり、成分組成が、質量%で、0.07%<C≦0.25%、P+S<0.03%、Mn≧1.8%、Si>1.2%を満たす請求項3に記載の自動車用骨格部品の製造方法。   One steel plate having a substantially hat-shaped cross-sectional shape and the other steel plate having a substantially hat-shaped cross-sectional shape or a steel plate having a panel shape are high-tensile steel plates having a tensile strength of 980 MPa or more and a thickness of 1.0 to 2.0 mm. The component composition satisfies 0.07% <C ≦ 0.25%, P + S <0.03%, Mn ≧ 1.8%, and Si> 1.2% in mass%. Manufacturing method of skeleton parts.
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