JP7081531B2 - Manufacturing method of tailored blank material - Google Patents
Manufacturing method of tailored blank material Download PDFInfo
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- JP7081531B2 JP7081531B2 JP2019032698A JP2019032698A JP7081531B2 JP 7081531 B2 JP7081531 B2 JP 7081531B2 JP 2019032698 A JP2019032698 A JP 2019032698A JP 2019032698 A JP2019032698 A JP 2019032698A JP 7081531 B2 JP7081531 B2 JP 7081531B2
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Description
本発明はテーラードブランク材の製造方法に関し、特に、部位に応じて厚みが異なるテーラードブランク材の製造方法に関する。 The present invention relates to a method for producing a tailored blank material, and more particularly to a method for producing a tailored blank material having a different thickness depending on a portion.
特許文献１に開示の曲げ加工部材の製造方法では、まず、本体である金属板において曲げ加工される位置に開口を形成し、この開口に金属製の補強板を嵌め込む。さらに、補強板を金属板に溶接した後、金属板を曲げ加工する。
In the method for manufacturing a bending member disclosed in
発明者等は、上記した曲げ加工部材の製造方法について以下の課題を発見した。 The inventors have discovered the following problems with respect to the above-mentioned method for manufacturing a bending member.
上記した曲げ加工部材の製造方法では、開口部や溶接方法等の品質管理を厳格に行うことを必要とし、製造コストが高くなる傾向にある。よって、製造コストに改善の余地がある。また、金属板と補強板との厚みが異なると、金属板と補強板との境界の断面において角部があることが多い。そのため、応力がそれらの溶接部に集中し、疲労強度が低下するおそれがある。金属板と補強板との境界があり、外観品質に改善の余地があった。 In the above-mentioned method for manufacturing a bending member, it is necessary to strictly control the quality of openings, welding methods, etc., and the manufacturing cost tends to be high. Therefore, there is room for improvement in manufacturing costs. Further, when the thicknesses of the metal plate and the reinforcing plate are different, there are often corners in the cross section of the boundary between the metal plate and the reinforcing plate. Therefore, stress may be concentrated on those welds and the fatigue strength may decrease. There was a boundary between the metal plate and the reinforcing plate, and there was room for improvement in the appearance quality.
本発明は、疲労強度が低下するおそれを抑制しつつ製造コスト及び外観品質の改善を図るものとする。 The present invention aims to improve the manufacturing cost and the appearance quality while suppressing the possibility that the fatigue strength is lowered.
本発明に係るテーラードブランク材の製造方法は、
鋼板をプレス加工することによって、前記鋼板に凹部を形成するステップと、
肉盛溶接を前記凹部に複数回実施し、所定の方向に延びた形状を有し、かつ並列配置された複数の溶接ビードを前記凹部に配置することによって、肉盛溶接部を前記凹部に形成するステップと、
前記肉盛溶接部の上面を機械加工するステップと、を備え、
前記肉盛溶接部を前記凹部に形成するステップでは、
前記複数の溶接ビード同士が相互に重なる溶接ラップ部は、前記凹部の開口面と、前記溶接ラップ部を含む前記溶接ビード同士の表面とに区画される谷状空間と断面積が略同じである。
The method for producing a tailored blank material according to the present invention is as follows.
The step of forming a recess in the steel sheet by pressing the steel sheet,
An overlay weld is formed in the recess by performing overlay welding a plurality of times in the recess and arranging a plurality of weld beads having a shape extending in a predetermined direction and arranged in parallel in the recess. Steps to do and
A step of machining the upper surface of the overlay welded portion is provided.
In the step of forming the overlay welded portion in the recess,
The weld wrap portion in which the plurality of weld beads overlap each other has substantially the same cross-sectional area as the valley-shaped space defined by the opening surface of the recess and the surface of the weld beads including the weld wrap portion. ..
このような構成によれば、製造されたテーラードブランク材の一方の主面において厚みが変化する部位とその近傍の部位は、一体の鋼板によって構成される。よって、厚みが変化する部位は、その断面において角部がなく、滑らかに傾斜する、又は曲がる。よって、疲労強度が低下するおそれを抑制する。品質管理を厳格に行うことを必要とし、製造コスト及び外観品質の改善を図る。 According to such a configuration, a portion where the thickness changes and a portion in the vicinity thereof on one main surface of the manufactured tailored blank material are composed of an integral steel plate. Therefore, the portion where the thickness changes has no corner in the cross section and is smoothly inclined or bent. Therefore, the possibility that the fatigue strength is lowered is suppressed. Strict quality control is required to improve manufacturing costs and appearance quality.
本発明は、疲労強度が低下するおそれを抑制しつつ製造コスト及び外観品質の改善を図ることができる。 INDUSTRIAL APPLICABILITY The present invention can improve the manufacturing cost and the appearance quality while suppressing the possibility that the fatigue strength is lowered.
以下、本発明を適用した具体的な実施形態について、図面を参照しながら詳細に説明する。ただし、本発明が以下の実施形態に限定される訳ではない。また、説明を明確にするため、以下の記載及び図面は、適宜、簡略化されている。 Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings are appropriately simplified.
（実施の形態１）
図１～図３を参照して実施の形態１について説明する。図１は、実施の形態１に係るテーラードブランク材の製造方法の各ステップのワークを示す斜視図である。図２は、実施の形態１に係るテーラードブランク材の製造方法の各ステップのワークを示す断面図である。図２は、図１が示すワークの断面を示す。図２は、図１の矢視図である。図３は、成形体の要部の断面図である。図３は、図２が示すワークによる成形体の要部を示す。
(Embodiment 1)
The first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a work of each step of the method for manufacturing a tailored blank material according to the first embodiment. FIG. 2 is a cross-sectional view showing a work of each step of the method for manufacturing a tailored blank material according to the first embodiment. FIG. 2 shows a cross section of the work shown in FIG. FIG. 2 is an arrow view of FIG. 1. FIG. 3 is a cross-sectional view of a main part of the molded body. FIG. 3 shows a main part of a molded body made of the work shown in FIG.
なお、当然のことながら、図１及びその他の図面に示した右手系ｘｙｚ座標は、構成要素の位置関係を説明するための便宜的なものである。通常、ｚ軸プラス向きが鉛直上向き、ｘｙ平面が水平面であり、図面間で共通である。 As a matter of course, the right-handed xyz coordinates shown in FIG. 1 and other drawings are for convenience to explain the positional relationship of the components. Normally, the z-axis plus direction is vertically upward, and the xy plane is a horizontal plane, which is common between drawings.
図１及び図２に示すように、まず、鋼板Ｗ１の所定の部位をプレス加工し、増厚部Ｗ１ｃを鋼板Ｗ１に形成する（プレス加工ステップＳＴ１）。鋼板Ｗ１は、第１の主面Ｗ１ａと、第２の主面Ｗ１ｂとを備える板状体である。鋼板Ｗ１は、プレス加工によって加工することができる鉄鋼材料からなる。プレス加工ステップＳＴ１は、鋼板Ｗ１を切り抜くと同時に行うと、生産性が良い。 As shown in FIGS. 1 and 2, first, a predetermined portion of the steel sheet W1 is press-processed to form a thickened portion W1c on the steel sheet W1 (pressing step ST1). The steel plate W1 is a plate-like body including a first main surface W1a and a second main surface W1b. The steel plate W1 is made of a steel material that can be processed by press working. If the press working step ST1 is performed at the same time as cutting out the steel plate W1, the productivity is good.
増厚部Ｗ１ｃは、第１の主面Ｗ１ａにおいて凹んだ凹部Ｗ１ｅを備える。凹部Ｗ１ｅは、第１の主面Ｗ１ａに開口する開口面Ｌ１ａを有する。凹部Ｗ１ｅにおける開口面Ｌ１ａは、鋼板Ｗ１の第１の主面Ｗ１ａと同じ平面上にある。開口面Ｌ１ａと第１の主面Ｗ１ａとは連続する。 The thickening portion W1c includes a recess W1e recessed in the first main surface W1a. The recess W1e has an opening surface L1a that opens into the first main surface W1a. The opening surface L1a in the recess W1e is on the same plane as the first main surface W1a of the steel plate W1. The opening surface L1a and the first main surface W1a are continuous.
図３に示すように、凹部Ｗ１ｅは、内壁面Ｗ１ｆと、座面Ｗ１ｇとを備える。内壁面Ｗ１ｆは、第１の主面Ｗ１ａから第２の主面Ｗ１ｂ側へ、第１の主面Ｗ１ａに対して傾斜する方向に延びて、座面Ｗ１ｇに接続する。座面Ｗ１ｇは、開口面Ｌ１ａと第１の主面Ｗ１ａと略平行に延びるとよい。 As shown in FIG. 3, the recess W1e includes an inner wall surface W1f and a seat surface W1g. The inner wall surface W1f extends from the first main surface W1a toward the second main surface W1b in a direction inclined with respect to the first main surface W1a, and is connected to the seat surface W1g. The seat surface W1g may extend substantially parallel to the opening surface L1a and the first main surface W1a.
また、増厚部Ｗ１ｃは、第２の主面Ｗ１ｂから張り出た張出面Ｗ１ｄを備える。張出面Ｗ１ｄは、底面Ｗ１ｈと、外壁面Ｗ１ｉとを備える。外壁面Ｗ１ｉは、第２の主面Ｗ１ｂから張り出す方向に傾斜して延びて、底面Ｗ１ｈに接続する。底面Ｗ１ｈは、第２の主面Ｗ１ｂと略平行に延びるとよい。外壁面Ｗ１ｉと第２の主面Ｗ１ｂとが交差した交差部Ｗ１ｊは、所定の曲率Ｒ１を有する。外壁面Ｗ１ｉと底面Ｗ１ｈとが交差した交差部Ｗ１ｋは、所定の曲率Ｒ２を有する。曲率Ｒ１、Ｒ２は、許容応力に応じて、適宜変更するとよい。 Further, the thickening portion W1c includes an overhanging surface W1d protruding from the second main surface W1b. The overhanging surface W1d includes a bottom surface W1h and an outer wall surface W1i. The outer wall surface W1i is inclined and extends in a direction protruding from the second main surface W1b, and is connected to the bottom surface W1h. The bottom surface W1h may extend substantially parallel to the second main surface W1b. The intersection W1j where the outer wall surface W1i and the second main surface W1b intersect has a predetermined curvature R1. The intersection W1k where the outer wall surface W1i and the bottom surface W1h intersect has a predetermined curvature R2. The curvatures R1 and R2 may be appropriately changed according to the allowable stress.
なお、プレス加工ステップＳＴ１を完了した時点では、増厚部Ｗ１ｃはその周辺の部位から張り出ているが、凹部Ｗ１ｅを備えている。そのため、増厚部Ｗ１ｃの肉厚はその周辺の部位と殆ど同じ厚みである。しかし、次のステップである肉盛溶接加工ステップＳＴ２を完了した時点では、増厚部Ｗ１ｃは、肉盛溶接部Ｗ２を凹部Ｗ１ｅに充填したため、その厚みが増大しており、増厚部Ｗ１ｃは、その周辺の部位と比較して厚い。 When the press working step ST1 is completed, the thickened portion W1c projects from a portion around the thickened portion W1c, but has a recess W1e. Therefore, the wall thickness of the thickened portion W1c is almost the same as that of the peripheral portion. However, when the next step, the overlay welding step ST2, is completed, the thickness of the thickened portion W1c is increased because the overlay welded portion W2 is filled in the recess W1e, and the thickened portion W1c has a thickened portion W1c. , Thick compared to the surrounding area.
また、鋼板Ｗ１の引張強度が９８０ＭＰａ以下であると好ましい。鋼板Ｗ１の引張強度が９８０ＭＰａ以下である場合、本製造方法による成形体Ｗ１０のＨＡＺ（熱影響）部が軟化することを抑制する。そのため、成形体Ｗ１０は、良好な静的強度及び疲労強度を維持するＨＡＺ部を備える。 Further, it is preferable that the tensile strength of the steel sheet W1 is 980 MPa or less. When the tensile strength of the steel sheet W1 is 980 MPa or less, the HAZ (heat-affected zone) portion of the molded body W10 according to this manufacturing method is suppressed from softening. Therefore, the molded body W10 includes a HAZ portion that maintains good static strength and fatigue strength.
続いて、肉盛溶接を凹部Ｗ１ｅに複数回実施して、肉盛溶接部Ｗ２を凹部Ｗ１ｅの内側に形成する（肉盛溶接加工ステップＳＴ２）。具体的には、肉盛溶接を凹部Ｗ１ｅに複数回実施することによって、複数の溶接ビードを凹部Ｗ１ｅに配置し、肉盛溶接部Ｗ２を凹部Ｗ１ｅに形成する。肉盛溶接は、アーク溶接を用いて行うとよい。アーク溶接は、他の溶接方法と比較して、溶接時間が短く、コストが小さい傾向にあるからである。また、溶接ワイヤは、所望する増厚部Ｗ１ｃの機械的強度に応じて、選択するとよい。 Subsequently, overlay welding is performed a plurality of times in the recess W1e to form the overlay weld W2 inside the recess W1e (overlay welding step ST2). Specifically, by performing overlay welding a plurality of times in the recess W1e, a plurality of weld beads are arranged in the recess W1e, and the overlay weld portion W2 is formed in the recess W1e. Overlay welding may be performed using arc welding. This is because arc welding tends to have a shorter welding time and lower cost than other welding methods. Further, the welding wire may be selected according to the desired mechanical strength of the thickened portion W1c.
例えば、図４に示すように、肉盛溶接部Ｗ２は、複数の溶接ビードＷ２１、Ｗ２２、Ｗ２３、Ｗ２４を備える。複数の溶接ビードＷ２１、Ｗ２２、Ｗ２３が座面Ｗ１ｇ上において所定の方向（図４では、ｘ軸方向）に並列配置されるように、複数回、肉盛溶接を凹部Ｗ１ｅに実施するとよい。複数の溶接ビードＷ２１、Ｗ２２、Ｗ２３、Ｗ２４は、それぞれ座面Ｗ１ｇ上において所定の方向（図４では、ｙ軸方向）に延びた形状を有するとよい。隣接する溶接ビード同士が重なり合うように、複数回、肉盛溶接を凹部Ｗ１ｅにする。 For example, as shown in FIG. 4, the overlay welded portion W2 includes a plurality of weld beads W21, W22, W23, and W24. Overlay welding may be performed on the recess W1e a plurality of times so that the plurality of weld beads W21, W22, and W23 are arranged in parallel on the seat surface W1g in a predetermined direction (x-axis direction in FIG. 4). The plurality of weld beads W21, W22, W23, and W24 may each have a shape extending in a predetermined direction (in the y-axis direction in FIG. 4) on the seat surface W1g. The overlay welding is made into the recess W1e multiple times so that the adjacent welding beads overlap each other.
肉盛溶接部Ｗ２は、溶接ラップ部Ｗ３１、Ｗ３２、Ｗ３３を備える。複数の溶接ビードＷ２１、Ｗ２２、Ｗ２３、Ｗ２４が延びる方向に沿う仮想軸（図４では、ｙ軸）と交差する断面（図４では、ｚｘ平面）において、溶接ラップ部Ｗ３１は、溶接ビードＷ２１、Ｗ２２が相互に重なる部位である。同様に、溶接ラップ部Ｗ３２は、当該断面において、溶接ビードＷ２２、Ｗ２３同士が相互に重なる部位である。溶接ラップ部Ｗ３３は、当該断面において、溶接ビードＷ２３、Ｗ２４同士が相互に重なる部位である。溶接ビードＷ２１、Ｗ２２、Ｗ２３、Ｗ２４の断面形状は、開口面Ｌ１ａ側に山状に張り出るとよく、その頂点は、開口面Ｌ１ａ、又は開口面Ｌ１ａよりも上方（ここでは、ｚ軸プラス側）に位置するとよい。 The overlay welded portion W2 includes welded lap portions W31, W32, and W33. In the cross section (zx plane in FIG. 4) intersecting the virtual axis (y-axis in FIG. 4) along the direction in which the plurality of weld beads W21, W22, W23, W24 extend, the weld wrap portion W31 is the weld bead W21. It is a part where W22 overlaps with each other. Similarly, the weld wrap portion W32 is a portion where the weld beads W22 and W23 overlap each other in the cross section. The weld wrap portion W33 is a portion where the weld beads W23 and W24 overlap each other in the cross section. The cross-sectional shapes of the weld beads W21, W22, W23, and W24 may project in a mountain shape toward the opening surface L1a, and the apex thereof is above the opening surface L1a or the opening surface L1a (here, the z-axis plus side). ) Should be located.
凹部Ｗ１ｅの開口面Ｌ１ａと、溶接ラップ部Ｗ３１を含む溶接ビードＷ２１、Ｗ２２の表面に区画される谷状空間Ｖ３１がある。同様に、溶接ラップ部Ｗ３２を含む溶接ビードＷ２２、Ｗ２３の表面に区画される谷状空間Ｖ３２がある。同様に、溶接ラップ部Ｗ３３を含む溶接ビードＷ２３、Ｗ２４の表面に区画される谷状空間Ｖ３３がある。図４に示す断面において、溶接ラップ部Ｗ３１、Ｗ３２、Ｗ３３は、それぞれ、谷状空間Ｖ３１、Ｖ３２、Ｖ３３と断面積が略同じである。これによって、肉盛溶接加工ステップＳＴ２の完了後において、比較的平坦な面を確保することができる。この理由の１つとして、例えば、凹部Ｗ１ｅの容積と、溶接ラップ部Ｗ３１、Ｗ３２、Ｗ３３の体積との差が小さくなることが挙げられる。次工程の機械加工ステップＳＴ３において、機械加工の取り代を低減することができる。 There is an opening surface L1a of the recess W1e and a valley-shaped space V31 partitioned on the surfaces of the weld beads W21 and W22 including the weld wrap portion W31. Similarly, there is a valley-shaped space V32 partitioned on the surfaces of the weld beads W22 and W23 including the weld wrap portion W32. Similarly, there is a valley-shaped space V33 partitioned on the surface of the weld beads W23 and W24 including the weld wrap portion W33. In the cross section shown in FIG. 4, the weld wrap portions W31, W32, and W33 have substantially the same cross-sectional area as the valley-shaped spaces V31, V32, and V33, respectively. As a result, a relatively flat surface can be secured after the completion of the overlay welding step ST2. One of the reasons for this is that, for example, the difference between the volume of the recess W1e and the volumes of the welded wrap portions W31, W32, and W33 becomes small. In the machining step ST3 of the next process, the machining allowance can be reduced.
肉盛溶接部Ｗ２は、溶接ラップ部Ｗ３１、Ｗ３２、Ｗ３３等により、図４に示す断面積よりも大きな断面積を備える。肉盛溶接部Ｗ２の上面Ｗ２ａは、うねった形状を備える。肉盛溶接部Ｗ２が凹部Ｗ１ｅを埋める、又は充填する。図２に示すように、肉盛溶接部Ｗ２の余盛り高さＢＨ１は、凹部Ｗ１ｅの座面Ｗ１ｇから開口面Ｌ１ａまでの座面高さＳＨ１を超えるとよい。つまり、肉盛溶接部Ｗ２の少なくとも一部は、開口面Ｌ１ａを越えていてもよい。 The overlay weld portion W2 has a cross-sectional area larger than the cross-sectional area shown in FIG. 4 due to the weld wrap portions W31, W32, W33 and the like. The upper surface W2a of the overlay welded portion W2 has an undulating shape. The overlay weld W2 fills or fills the recess W1e. As shown in FIG. 2, the extra height BH1 of the overlay welded portion W2 may exceed the seat height SH1 from the seat surface W1g of the recess W1e to the opening surface L1a. That is, at least a part of the overlay welded portion W2 may exceed the opening surface L1a.
最後に、肉盛溶接部Ｗ２の上面Ｗ２ａを機械加工し、成形体Ｗ１０を形成する（機械加工ステップＳＴ３）。肉盛溶接部Ｗ２の上面Ｗ２ａは、凹部Ｗ１ｅの開口面Ｌ１ａ面に倣うように機械加工される。言い換えると、隣り合う肉盛溶接部Ｗ２の上面Ｗ２ａと鋼板Ｗ１の第１の主面Ｗ１ａとは、段差なく殆ど同じ平面上に位置する。 Finally, the upper surface W2a of the overlay welded portion W2 is machined to form the molded body W10 (machining step ST3). The upper surface W2a of the overlay welded portion W2 is machined so as to follow the opening surface L1a surface of the recess W1e. In other words, the upper surface W2a of the adjacent overlay welded portions W2 and the first main surface W1a of the steel plate W1 are located on almost the same plane without any step.
以上より、成形体Ｗ１０を製造することができる。成形体Ｗ１０は、テーラードブランク材として利用できる。 From the above, the molded product W10 can be manufactured. The molded body W10 can be used as a tailored blank material.
ここで、図３に示すように、成形体Ｗ１０は、一方の第２の主面Ｗ１ｂにおいて、増厚部Ｗ１ｃから、増厚部Ｗ１ｃの周辺の部位にかけて、厚みが減少して変化する。増厚部Ｗ１ｃとその周辺の部位とは、１枚の鋼板Ｗ１によって構成される。よって、厚みが変化する増厚部Ｗ１ｃとその周辺の部位とは、その断面において角部がなく、滑らかに傾斜する、又は曲がる。よって、疲労強度が低下するおそれを抑制する。品質管理を厳格に行う必要が無いため製造コストの低減を図ることできる。 Here, as shown in FIG. 3, the thickness of the molded body W10 decreases and changes from the thickened portion W1c to the peripheral portion of the thickened portion W1c on one of the second main surfaces W1b. The thickened portion W1c and the peripheral portion thereof are composed of one steel plate W1. Therefore, the thickened portion W1c whose thickness changes and the portion around the thickened portion W1c have no corners in the cross section thereof, and are smoothly inclined or bent. Therefore, the possibility that the fatigue strength is lowered is suppressed. Since it is not necessary to carry out strict quality control, it is possible to reduce the manufacturing cost.
また、成形体Ｗ１０の第２の主面Ｗ１ｂは、１枚の鋼板Ｗ１によって構成され、連続した表面を備え、切れ目や境界を確認することができない。第１の主面Ｗ１ａは、鋼板Ｗ１と肉盛溶接部Ｗ２とによって構成され、鋼板Ｗ１と肉盛溶接部Ｗ２との境界を備え、その境界を確認することができる。第２の主面Ｗ１ｂは、切れ目や境界が無く、連続しており、第１の主面Ｗ１ａは、第２の主面Ｗ１ｂ等、切れ目や境界のある主面と比較して、美観に優れる。そのため、成形体Ｗ１０は、第２の主面Ｗ１ｂが外観に現れるように配置される外観部品として利用されると、好ましい。 Further, the second main surface W1b of the molded body W10 is composed of one steel plate W1 and has a continuous surface, so that a cut or a boundary cannot be confirmed. The first main surface W1a is composed of a steel plate W1 and an overlay welded portion W2, has a boundary between the steel plate W1 and the overlay welded portion W2, and the boundary can be confirmed. The second main surface W1b has no breaks or boundaries and is continuous, and the first main surface W1a is superior in aesthetics to the main surfaces having cuts or boundaries such as the second main surface W1b. .. Therefore, it is preferable that the molded body W10 is used as an appearance component in which the second main surface W1b is arranged so as to appear in the appearance.
（実験）
次に、溶接した鋼板について行った実験について説明する。
(experiment)
Next, an experiment performed on a welded steel sheet will be described.
当該実験では、主に引張強度が異なる鋼板を用いて、所定の溶接条件で、溶接を行なった。溶接条件は、上記した肉盛溶接加工ステップＳＴ２と同じ条件に設定した。さらに、その溶接した鋼板の溶接金属、ＨＡＺ（熱影響）部、及び母材におけるビッカース硬さを測定した。その測定した結果を図５に示す。なお、図５の凡例に示す各数字は、鋼板の引張強度を示し、図５の凡例に示す「ＨＳ」は、ホットスタンプ（1500MPa級）を示す。 In this experiment, welding was performed under predetermined welding conditions mainly using steel plates having different tensile strengths. The welding conditions were set to the same conditions as the overlay welding processing step ST2 described above. Further, the Vickers hardness of the weld metal, the HAZ (heat-affected zone) portion, and the base metal of the welded steel sheet was measured. The measurement result is shown in FIG. In addition, each number shown in the legend of FIG. 5 indicates the tensile strength of the steel sheet, and “HS” shown in the legend of FIG. 5 indicates a hot stamp (1500 MPa class).
図５に示すように、引張強度９８０ＭＰａを越えた鋼板を用いた場合、ＨＡＺ部は、溶接金属、及び母材と比較して、ビッカース硬さが小さかった。よって、引張強度９８０ＭＰａを越えた鋼板は、鋼板Ｗ１として用いると、静的強度や疲労強度が低下するおそれがある。 As shown in FIG. 5, when a steel plate having a tensile strength exceeding 980 MPa was used, the HAZ portion had a smaller Vickers hardness than the weld metal and the base metal. Therefore, if a steel sheet having a tensile strength exceeding 980 MPa is used as the steel sheet W1, the static strength and fatigue strength may decrease.
引張強度９８０ＭＰａ以下の鋼板を用いた場合、ＨＡＺ部は、溶接金属と比較してビッカース硬さが小さいものの、母材と比較してビッカース硬さが大きく変化せず、同程度の値を示した。よって、引張強度９８０ＭＰａ以下の鋼板は、引張強度９８０ＭＰａを越えた鋼板と比較して、鋼板Ｗ１として用いると、静的強度や疲労強度が大きく低下しない。したがって、鋼板Ｗ１として、引張強度９８０ＭＰａを越えた鋼板よりも引張強度９８０ＭＰａ以下の鋼板を用いると好ましい。 When a steel plate with a tensile strength of 980 MPa or less was used, the Vickers hardness of the HAZ portion was smaller than that of the weld metal, but the Vickers hardness did not change significantly as compared with the base metal, showing the same value. .. Therefore, when a steel sheet having a tensile strength of 980 MPa or less is used as the steel sheet W1 as compared with a steel sheet having a tensile strength of more than 980 MPa, the static strength and fatigue strength do not significantly decrease. Therefore, as the steel sheet W1, it is preferable to use a steel sheet having a tensile strength of 980 MPa or less rather than a steel sheet having a tensile strength of more than 980 MPa.
なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。 The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.
Ｗ１ 鋼板
Ｗ１ａ 第１の主面 Ｗ１ｂ 第２の主面
Ｗ１ｃ 増厚部 Ｗ１ｄ 張出面
Ｗ１ｅ 凹部 Ｗ１ｆ 内壁面
Ｗ１ｇ 座面 Ｗ１ｈ 底面
Ｗ１ｉ 外壁面 Ｗ１ｊ、Ｗ１ｋ 交差部
Ｗ２ 肉盛溶接部
Ｗ２１、Ｗ２２、Ｗ２３、Ｗ２４ 溶接ビード
Ｗ２ａ 上面
Ｗ３１、Ｗ３２、Ｗ３３ 溶接ラップ部
Ｗ１０ 成形体
Ｌ１ａ 開口面 Ｖ３１、Ｖ３２、Ｖ３３ 谷状空間
ＳＴ１ プレス加工ステップ ＳＴ２ 肉盛溶接加工ステップ
ＳＴ３ 機械加工ステップ
W1 Steel plate W1a First main surface W1b Second main surface W1c Thickened part W1d Overhanging surface W1e Recessed surface W1f Inner wall surface W1g Seat surface W1h Bottom surface W1i Outer wall surface W1j, W1k Crossing part W2 Overlay welded part W21, W22, W23, W24 Welding bead W2a Top surface W31, W32, W33 Welding wrap W10 Molded body L1a Opening surface V31, V32, V33 Valley-shaped space ST1 Pressing step ST2 Overlay welding step ST3 Machining step
Claims (1)
肉盛溶接を前記凹部に複数回実施し、所定の方向に延びた形状を有し、かつ並列配置された複数の溶接ビードを前記凹部に配置することによって、肉盛溶接部を前記凹部に形成するステップと、
前記肉盛溶接部の上面を機械加工するステップと、を備え、
前記肉盛溶接部を前記凹部に形成するステップでは、
前記複数の溶接ビード同士が相互に重なる溶接ラップ部は、前記凹部の開口面と、前記溶接ラップ部を含む前記溶接ビード同士の表面とに区画される谷状空間と断面積が略同じである、
テーラードブランク材の製造方法。 The step of forming a recess in the steel sheet by pressing the steel sheet,
An overlay weld is formed in the recess by performing overlay welding a plurality of times in the recess and arranging a plurality of weld beads having a shape extending in a predetermined direction and arranged in parallel in the recess. Steps to do and
A step of machining the upper surface of the overlay welded portion is provided.
In the step of forming the overlay welded portion in the recess,
The weld wrap portion in which the plurality of weld beads overlap each other has substantially the same cross-sectional area as the valley-shaped space defined by the opening surface of the recess and the surface of the weld beads including the weld wrap portion. ,
Manufacturing method of tailored blank material.
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| JP2003285122A (en) | 2002-03-26 | 2003-10-07 | Honda Motor Co Ltd | Press forming method for assembled blank material |
| US20090266135A1 (en) | 2008-04-23 | 2009-10-29 | Benteler Automobiltechnik Gmbh | Method of producing sheet metal blanks having a varing thickness |
| WO2017141639A1 (en) | 2016-02-16 | 2017-08-24 | 株式会社神戸製鋼所 | Layering control device, layering control method, and program |
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| JP2003285122A (en) | 2002-03-26 | 2003-10-07 | Honda Motor Co Ltd | Press forming method for assembled blank material |
| US20090266135A1 (en) | 2008-04-23 | 2009-10-29 | Benteler Automobiltechnik Gmbh | Method of producing sheet metal blanks having a varing thickness |
| WO2017141639A1 (en) | 2016-02-16 | 2017-08-24 | 株式会社神戸製鋼所 | Layering control device, layering control method, and program |
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