JP2000197969A - Blank for integrally forming and forming method thereof - Google Patents
Blank for integrally forming and forming method thereofInfo
- Publication number
- JP2000197969A JP2000197969A JP10370523A JP37052398A JP2000197969A JP 2000197969 A JP2000197969 A JP 2000197969A JP 10370523 A JP10370523 A JP 10370523A JP 37052398 A JP37052398 A JP 37052398A JP 2000197969 A JP2000197969 A JP 2000197969A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- line
- blank
- weld
- forming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は主に自動車のボディ
やシャシー用のプレス部品製造に利用される一体化成形
用ブランク（テーラードブランク）技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated molding blank (tailored blank) technology mainly used for manufacturing pressed parts for an automobile body and a chassis.
【０００２】[0002]
【従来の技術】従来のプレスおよびプレス品の組立技術
は、一枚の金属板を所定の形状に切断し（この切断した
金属板はブランクと呼ばれる）、その後、プレス成形
し、プレス品を溶接・接着等で組み立てて構造物とする
方式であった。2. Description of the Related Art Conventional press and pressed product assembling techniques involve cutting one metal plate into a predetermined shape (the cut metal plate is called a blank), then press-forming and welding the pressed product. -It was a method of assembling by gluing etc. to make a structure.
【０００３】これに対し、１９６０年代初期から、プレ
ス成形する前にいくつかの金属板（ブランク）を突き合
わせ、レーザ溶接やマッシュシーム溶接によって１枚の
ブランクとし、その後プレスする技術が普及してきた。
この技術は、テーラーメイドの溶接ブランクということ
で、「テーラードブランク」と呼ばれている。On the other hand, since the early 1960's, a technique of butting several metal plates (blanks) before press forming, forming one blank by laser welding or mash seam welding, and then pressing has been widespread.
This technique is called a "tailored blank" because it is a tailor-made welding blank.
【０００４】このテーラードブランク技術では以下に述
べる多くのメリットがある。 (a) 従来、スクラップとして処理されていた小型の鋼板
を溶接によりつなぎ合わせて大型のブランクとして用い
ることができ、材料の有効利用が可能になる。[0004] This tailored blank technique has many advantages described below. (a) Conventionally, small steel plates that have been treated as scrap can be joined together by welding and used as a large blank, and the material can be effectively used.
【０００５】(b) 従来はプレス部品の強度不足を補うた
めに、部分的に補強部材を接合していたが、テーラード
ブランクを用いればあらかじめ強度が必要な場所に高強
度材またはより厚い材料を用いて強度が確保でき、補強
部材のコストを削減できる。(B) Conventionally, a reinforcing member was partially joined in order to compensate for insufficient strength of a pressed part. However, if a tailored blank is used, a high-strength material or a thicker material is previously placed in a place where strength is required. When used, the strength can be secured, and the cost of the reinforcing member can be reduced.
【０００６】(c) 高価な材料（高張力鋼板、表面処理鋼
板）の使用量が抑えられ、材料費を削減できる。また、
車体の軽量化にもつながる。(C) The amount of expensive materials (high-strength steel sheets, surface-treated steel sheets) used can be reduced, and material costs can be reduced. Also,
It also leads to a lighter body.
【０００７】(d) 自動車の衝突時に最適な車体変形が得
られるよう、所定の強度部材を配置することができ、衝
突安全性に優れた部品や車体の設計が可能になる。(D) Predetermined strength members can be arranged so that optimum vehicle deformation can be obtained at the time of a collision of an automobile, and components and vehicle bodies with excellent collision safety can be designed.
【０００８】図１は実用化されている突合わせ溶接によ
るテーラードブランクの溶接方式を示す模式図であり同
図(a) はレーザ溶接、同図(b) はマッシュシーム溶接の
場合である。同図において、符号１は金属板Ａ、２は金
属板Ｂ、４は溶接部である。通常、金属板Ａが基本とな
る金属板、金属板Ｂが補強材などの付加的金属板であ
る。溶接方式にはこの他電子ビーム溶接、アーク溶接、
高周波加熱溶接もある。FIG. 1 is a schematic diagram showing a welding system for tailored blanks by butt welding which has been put into practical use. FIG. 1 (a) shows a case of laser welding and FIG. 1 (b) shows a case of mash seam welding. In the figure, reference numeral 1 denotes a metal plate A, 2 denotes a metal plate B, and 4 denotes a welded portion. Usually, the metal plate A is a basic metal plate, and the metal plate B is an additional metal plate such as a reinforcing material. Other welding methods include electron beam welding, arc welding,
There is also high-frequency heating welding.
【０００９】同図(a) のレーザ溶接法は２枚の金属板を
突きあわせ、炭酸ガスレーザやＮｄ−ＹＡＧレーザビー
ムで溶融溶接する方法である。The laser welding method shown in FIG. 1A is a method in which two metal plates are butted and welded with a carbon dioxide gas laser or an Nd-YAG laser beam.
【００１０】同図(b) のマッシュシーム溶接は金属板端
部同士を２ｍｍ程度重ねて、回転円盤電極で加圧しなが
ら通電加熱し、重ね部をつぶしながら接合する方法であ
る。なお、マッシュシーム溶接では板端部をわずかに重
ねるものの、金属板の大部分は重なっておらず、本発明
でいう重ねられた金属板を線溶接したブランクではな
い。すなわち、同図の例は重ね溶接ではなく、突きあわ
せ溶接として分類される。The mash seam welding shown in FIG. 1B is a method in which metal plate ends are overlapped by about 2 mm, energized and heated while pressing with a rotating disk electrode, and joined while crushing the overlapped portions. In the mash seam welding, although the plate edges are slightly overlapped, most of the metal plates do not overlap, and the mash seam welding is not a blank obtained by wire welding the overlapped metal plates according to the present invention. That is, the example shown in the figure is classified as butt welding, not lap welding.
【００１１】突きあわせ溶接によるテーラードブランク
には多くの長所がある反面、以下の問題点もある。Although tailored blanks formed by butt welding have many advantages, they also have the following problems.
【００１２】(a) レーザ溶接による突き合わせ溶接で
は、接合される板の端部の切断精度およびレーザビーム
の位置決め精度が要求される。この精度が十分でない
と、不良品が多く発生する。そのため、切断装置、溶接
時の位置決め装置には高価な装置を用いる必要がある。(A) In butt welding by laser welding, cutting accuracy of the end of a plate to be joined and positioning accuracy of a laser beam are required. If the accuracy is not sufficient, many defective products are generated. Therefore, it is necessary to use expensive devices for the cutting device and the positioning device at the time of welding.
【００１３】一方、マッシュシーム溶接はレーザ溶接ほ
ど厳しい端面精度が要求されないが、電極により１トン
程度の加圧力を負荷するため、重ね代がずれやすく、強
力なクランプ力を有するクランプ機構が必要になる。こ
のためレーザ溶接ほどではないが、高価な装置が必要で
ある。[0013] On the other hand, mash seam welding does not require strict end face accuracy as compared with laser welding. However, since a pressing force of about 1 ton is applied by an electrode, the overlap margin is likely to shift, and a clamping mechanism having a strong clamping force is required. Become. For this reason, expensive equipment is required, although not as much as laser welding.
【００１４】(b) 溶接部が非直線となるような部品を接
合するとプレス部品の設計自由度が広がりテーラードブ
ランクの利点を最大限に引き出すことができる。しか
し、マッシュシーム溶接では回転円盤電極を用いるため
非直線溶接が極めて困難または不可能である。また、レ
ーザ溶接では非直線溶接が可能ではあるが、前記(a) に
述べた開先精度管理が直線溶接の場合より格段に難しく
なり、技術的、コスト的な問題から実用化は難しい。(B) By joining parts whose welds are non-linear, the degree of freedom in designing pressed parts is increased, and the advantages of tailored blanks can be maximized. However, in mash seam welding, non-linear welding is extremely difficult or impossible because a rotating disk electrode is used. In addition, although non-linear welding is possible in laser welding, the groove precision control described in (a) above is much more difficult than in linear welding, and practical application is difficult due to technical and cost problems.
【００１５】(c) プレス後の部品に溶接線が存在するた
めに、見栄えが悪く、自動車ボディの外板部品には適用
できない。また、溶接部は耐食性が劣り、高耐食性が要
求される部品には適用が難しい。耐食性が要求される部
位に適用する場合は、厚く塗装を施したり、塗装後シー
ラーで保護するなどの対策を講じる必要がある。(C) Since the welded line exists on the pressed part, the appearance is poor and cannot be applied to the outer plate part of the automobile body. Also, the welded portion has poor corrosion resistance, and is difficult to apply to parts requiring high corrosion resistance. When applying to parts where corrosion resistance is required, it is necessary to take measures such as applying a thick coating and protecting with a sealer after coating.
【００１６】上記の問題を解決すべく、２枚の鋼板を重
ね、その重なった面で多数スポット溶接した後にプレス
成形する技術が文献（ The Patchwork Techniqu For Pr
operMaterial Placement on Panels : Industrial Appl
ication on The New Peugeot 206.IBEC'98 Paper No.98
2402 ）に開示されている。In order to solve the above-mentioned problem, a technique of stacking two steel sheets, performing spot forming on a number of spot welds on the overlapped surface, and then press forming is described in The Patchwork Techniqu For Pr.
operMaterial Placement on Panels: Industrial Appl
ication on The New Peugeot 206.IBEC'98 Paper No.98
2402).
【００１７】図２は文献に開示された多数のスポット溶
接による一体成形用ブランクの溶接部の概要を示す模式
図である。同図において図１と同一部品は同一符号で表
す。同図に示すように、同文献に開示された方法は、重
ね合わせ部に多数のスポット溶接を行う方式である。こ
の方法は従来のレーザ溶接やマッシュシーム溶接による
突き合わせ方式のテーラードブランクに比べ、精度の高
い開先管理が不要で、位置決めクランプが簡単であり、
安価なスポット溶接法で製造されるため、低コストでテ
ーラードブランクが製造可能である。また、突合わせ部
端面が非直線の場合でも製造可能である点も長所であ
る。FIG. 2 is a schematic view showing an outline of a welded portion of a blank for integral molding by a large number of spot weldings disclosed in the literature. In the figure, the same parts as those in FIG. 1 are represented by the same reference numerals. As shown in the figure, the method disclosed in the document is a method of performing a large number of spot weldings on an overlapped portion. This method does not require high-precision groove management compared to conventional butt-type tailored blanks by laser welding or mash seam welding, simplifies positioning clamps,
Since it is manufactured by an inexpensive spot welding method, a tailored blank can be manufactured at low cost. Another advantage is that it can be manufactured even when the end face of the butted portion is non-linear.
【００１８】しかし、同文献に開始された技術はスポッ
ト溶接による点接合が基本であり、プレス成形時に溶接
部に大きな負荷がかかり、溶接部近傍でしわ、割れなど
の不良が発生しやすい。また、点接合であるためにプレ
ス後の部材の機械的性質（静的強度、疲労強度、剛性）
などが十分でない。さらに、２枚の鋼板の端部を重ねる
溶接方法であるために、鋼板のすきまに塗料がまわりこ
みにくく、すきま内でも腐食が生じやすいため耐食性が
劣るという問題がある。[0018] However, the technique started in the literature is basically spot welding by spot welding, and a large load is applied to the welded portion at the time of press forming, and defects such as wrinkles and cracks are likely to occur near the welded portion. In addition, the mechanical properties (static strength, fatigue strength, rigidity) of the pressed member due to point bonding
Is not enough. Furthermore, since the welding method involves overlapping the ends of two steel sheets, there is a problem that the coating material is unlikely to flow into the gaps between the steel sheets, and corrosion is easily generated even in the gaps, resulting in poor corrosion resistance.
【００１９】さらに、上記(c) の外観品質の問題はこの
方法によっても解決できない。すなわち、スポット溶接
であるため、両面とも打点による圧痕が形成され、外板
には適用できない。また、塗装後においても圧痕部表面
から腐食が発生する恐れも高い。Furthermore, the problem of appearance quality (c) cannot be solved by this method. That is, since spot welding is used, indentations are formed on both surfaces by hitting points and cannot be applied to the outer plate. In addition, there is a high possibility that corrosion occurs from the surface of the indented portion even after painting.
【００２０】[0020]
【発明が解決しようとする課題】本発明は目的は従来の
テーラードブランクが持つ長所を損なうことなく、下記
の要求を満たすブランクおよびその製造方法を提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a blank and a method for manufacturing the same which satisfy the following requirements without impairing the advantages of the conventional tailored blank.
【００２１】(a) 接合前部品の精度が要求されず、成形
時に簡単なクランプで製造できる。 (b) 接合前部品の端部が非直線でも製造できる。 (c) 成形後の部品の強度特性、耐食性が優れている。 (d) 外板への適用が可能な、表面品質を有する。(A) The precision of the parts before joining is not required, and the parts can be manufactured by simple clamps during molding. (b) It can be manufactured even if the end of the part before joining is non-linear. (c) The molded parts have excellent strength properties and corrosion resistance. (d) It has surface quality that can be applied to skins.
【００２２】[0022]
【課題を解決するための手段】上記の目的を実現するた
めに、発明者は鋭意検討を重ねた結果、以下の知見を得
た。Means for Solving the Problems In order to achieve the above object, the inventor has made intensive studies and as a result obtained the following knowledge.
【００２３】(a) 金属板同士を結合するのに点溶接は強
度的に不十分で、成形性も低い。また耐食性がよくな
い。(A) Spot welding is insufficient in strength to bond metal plates to each other and has low formability. Also, the corrosion resistance is not good.
【００２４】図３はスポット溶接と線溶接の比較を説明
する模式図であり同図(a) はスポット溶接試片の側面
図、同図(b) は線溶接の試片の側面図、同図(c) は線溶
接でのプレス割れの模式図である。同図において図１〜
２と同一部品は同一符号で表す。試片の材料には０．８
ｍｍと１．２ｍｍの冷延鋼板（ＳＰＣＣ）を用い、同図
(a) および(b) に示すように、部分重ね方式でスポット
溶接（ナゲット径：約４ｍｍ）およびレーザ溶接して試
片を作成した。これらのブランクを直径５０ｍｍの球頭
ポンチを用いて、張り出し試験により成形性を調査し
た。その結果、レーザ溶接による線溶接材は同図(c) に
示すように、０．８ｍｍの母材内で破断したのに対し、
スポット溶接による点溶接材は溶接部で破断した（図示
せず）。また、限界張り出し高さは、レーザ溶接材では
約３５ｍｍ、スポット溶接材では１０ｍｍであり、線溶
接の方が成形性に優れることがわかった。FIGS. 3A and 3B are schematic views illustrating a comparison between spot welding and wire welding. FIG. 3A is a side view of a spot welding specimen, and FIG. 3B is a side view of a wire welding specimen. Figure (c) is a schematic diagram of press cracking in wire welding. In FIG.
2 are denoted by the same reference numerals. 0.8 for specimen material
mm and 1.2 mm cold rolled steel sheet (SPCC)
As shown in (a) and (b), a specimen was prepared by spot welding (nugget diameter: about 4 mm) and laser welding in a partial overlap method. The moldability of these blanks was examined by an overhang test using a ball-head punch having a diameter of 50 mm. As a result, the wire-welded material by laser welding broke in the base material of 0.8 mm as shown in FIG.
The spot welding material by spot welding broke at the weld (not shown). In addition, the critical overhang height was about 35 mm for the laser welding material and 10 mm for the spot welding material, and it was found that the wire welding was superior in formability.
【００２５】また、線溶接はスポット溶接のような金属
板の波打ちがないため、金属板間の隙間が小さく、水な
どの侵入が防止できるので耐食性が高い。とくにすみ肉
溶接を行えば、金属板間の隙間がなくなり、耐食性は一
層向上する。Further, since wire welding does not have a wavy shape of a metal plate unlike spot welding, a gap between the metal plates is small and penetration of water or the like can be prevented, so that corrosion resistance is high. In particular, if fillet welding is performed, there is no gap between the metal plates, and the corrosion resistance is further improved.
【００２６】(b) シーム溶接の溶接線は直線状の制限が
あるが、レーザ溶接を用いれば、曲線化が可能であり、
部品板接合の自由度が大きくなる。(B) Although the welding line of seam welding has a linear limitation, it can be curved by using laser welding.
The degree of freedom in joining the component plates increases.
【００２７】(c) ２枚以上の金属板を突き合わせるので
はなく、面で重ね合わせ、その重なった部分の輪郭線近
傍を溶接して金属板を結合するようにすれば、溶接前部
品の打抜き加工の精度および溶接の位置決め精度はあま
り高くなくてもよい。クランプ時の保持力もあまり大き
くしなくてよい。(C) Rather than abutting two or more metal plates, they are superimposed on a surface, and the metal plate is joined by welding the vicinity of the contour of the overlapped portion, so that the parts before welding can be formed. The accuracy of the punching process and the positioning accuracy of the welding need not be very high. The holding force at the time of clamping need not be so large.
【００２８】線溶接は重なった部分の輪郭線の全周（外
周）にわたって連続的に線溶接するのがよい。溶接強度
が確保できるからであるが、部分的、断続的であっても
よい。しかし、輪郭線上近傍を部分的、断続的に線溶接
した場合、対角線上に相当する位置（輪郭線上の対向す
る部分）でも線溶接しておかないと、成形時または使用
時に２枚の金属板のせん断ずれが大きくなる。The line welding is preferably performed continuously over the entire periphery (outer periphery) of the outline of the overlapping portion. This is because the welding strength can be secured, but it may be partial or intermittent. However, if the line near the contour is partially or intermittently welded, the two metal plates must be welded together at the position corresponding to the diagonal line (opposite portion on the contour) unless they are formed or used. Shear deviation increases.
【００２９】輪郭線が非直線の場合はシーム溶接ができ
ないが、短い直線部分のみをシーム溶接し、さらに金属
板が重なった部分の輪郭線上の対向部分もシーム溶接す
ることによって、強度を維持しつつ、安価なシーム溶接
を使うことができる。Although seam welding cannot be performed when the contour is non-straight, the strength is maintained by seam welding only the short straight part, and also seam welding the opposing part on the contour of the part where the metal plates overlap. Meanwhile, inexpensive seam welding can be used.
【００３０】(d) 外観を形成する金属板の内側に１枚の
補強部材を重ねると、外観を形成する金属板を一体物と
して成形できる。これは、突合わせ溶接したブランクに
比較して、外観性に優れる。とくに、線溶接の溶融痕が
外側に出ないようにすると一層優れた外観が得られる。(D) When one reinforcing member is superposed on the inside of the metal plate forming the appearance, the metal plate forming the appearance can be formed as an integral body. This is superior in appearance in comparison with a butt-welded blank. In particular, a better appearance can be obtained if the welding traces of wire welding are prevented from appearing outside.
【００３１】本発明は上記の知見に基づいて完成したも
ので、その要旨は以下の(1) から(4) にある。The present invention has been completed based on the above findings, and the gist of the invention lies in the following (1) to (4).
【００３２】(1) 重ねられた２枚以上の金属板が、重な
った部分の輪郭線近傍で線溶接によって結合され、該輪
郭線上の該線溶接部に対向する部分の近傍で少なくとも
１個所線溶接によって結合されていることを特徴とする
一体化成形用ブランク。(1) Two or more superposed metal plates are joined by wire welding near the contour of the overlapped portion, and at least one wire is located near a portion of the contour facing the wire weld. An integrated molding blank characterized by being joined by welding.
【００３３】(2) 線溶接がすみ肉溶接であることを特徴
とする前記(1) 項に記載の一体化成形用ブランク。(2) The blank for integrated molding according to the above (1), wherein the wire welding is fillet welding.
【００３４】(3) 重ねられた金属板の外側面の少なくと
も１面に線溶接起因の溶融部がないことを特徴とする前
記(1) または(2) 項に記載の一体化成形用ブランク。(3) The blank for integral molding according to the above (1) or (2), wherein at least one of the outer surfaces of the stacked metal plates has no molten portion caused by wire welding.
【００３５】(4) ポンチおよびダイを用いて行うプレス
成形において、前記(3) 項に記載の一体化成形用ブラン
クを、線溶接起因の溶融部のない面をダイ側にして成形
することを特徴とするブランクの一体化成形方法。(4) In the press molding performed using a punch and a die, the blank for integral molding described in the above (3) is formed by setting the surface having no molten portion caused by wire welding to the die side. Characteristic integrated blanking method.
【００３６】ここで、本発明にいう２枚の金属板が「重
なっている」状態とは、図１(b) のマッシュシーム溶接
のように溶接線近傍のみで２枚の金属板が線状に重なっ
ている状態ではなく、金属板同士が被成形面の一部また
は全部の範囲にわたって面状に重なっており、重なった
部分が２次元的に広がった輪郭線を形成し、プレス成形
時にはこれらの金属板が重なりあった状態のまま一体で
成形されるものであることを意味する。また、「該線溶
接部に対向する該輪郭線上の部分」とは、輪郭線が正多
角形・長方形などの単純な形状の場合は対角線上の部分
である。一般図形では、図７の説明で後述するように、
ある溶接線部分に対して、成形中および／または成形部
品の使用中に、重なった金属板間に作用するせん断応力
が対応し、互いに逆方向で双方がバランスする関係にあ
る部分をいう。Here, the "overlapping" state of the two metal plates according to the present invention means that the two metal plates are linear only in the vicinity of the welding line as in mash seam welding in FIG. 1 (b). Instead of overlapping, the metal plates overlap in a planar manner over a part or the entire area of the surface to be molded, and the overlapped portion forms a two-dimensionally expanded contour line. Means that the metal plates are integrally formed in an overlapping state. In addition, the “portion on the contour line facing the line weld” is a diagonal portion when the contour line is a simple shape such as a regular polygon or a rectangle. In the general figure, as described later in the description of FIG. 7,
A portion where a certain welding line portion corresponds to a shear stress acting between the overlapped metal plates during forming and / or during use of a formed part, and the two are balanced in opposite directions to each other.
【００３７】[0037]
【発明の実施の形態】本発明の一体成形用ブランクは２
枚以上の金属板が重ねられ、重なった部分の輪郭線近傍
で線溶接によって接合され、該輪郭線上の該線溶接部分
が対向する部分も線溶接によって接合されている。BEST MODE FOR CARRYING OUT THE INVENTION The blank for integral molding according to the present invention is 2
Two or more metal plates are stacked and joined by wire welding in the vicinity of the contour of the overlapped portion, and the portion of the contour facing the wire welding portion is also joined by wire welding.
【００３８】溶接がスポット溶接のような点溶接である
と、成形時に溶接点に荷重が集中し、割れが生じやすく
なるからである。また、成形できても部材の強度ばらつ
きが大きく信頼性が低下する。点溶接でも打点数が多く
なると一点あたりの負荷荷重が小さくなり、上記のよう
な問題は改善されるが、打点数が増えることは施工上非
効率的である。[0038] If the welding is spot welding such as spot welding, the load is concentrated on the welding point at the time of forming and cracks are likely to occur. Further, even if molding can be performed, the strength of the members greatly varies, and the reliability is reduced. Even in spot welding, when the number of spots increases, the applied load per point decreases, and the above-described problem is improved. However, increasing the number of spots is inefficient in construction.
【００３９】図４は本発明に係るブランクの溶接部付近
の状態を示す模式図で同図(a) はレーザ溶接またはアー
ク溶接によるすみ肉重ね溶接の場合、同図(b) はレーザ
溶接またはアーク溶接による代つき重ね溶接の場合、同
図(c) はシーム溶接による代つき重ね溶接の場合であ
る。同図において図１〜３と同一部品は同一符号で表
す。また、本発明の詳細説明では図４(b) および(c) の
ように、金属板の重なった部分の輪郭線の内側を溶接す
る場合を「代つき」溶接という。FIG. 4 is a schematic view showing the state of the vicinity of the welded portion of the blank according to the present invention. FIG. 4 (a) shows the case of fillet lap welding by laser welding or arc welding, and FIG. FIG. 3C shows the case of the lap welding by seam welding. In this figure, the same parts as those in FIGS. In the detailed description of the present invention, the case where the inside of the contour of the overlapping portion of the metal plate is welded as shown in FIGS.
【００４０】同図(a) のようなすみ肉重ね溶接の場合は
切断・打抜きの精度を高くし、溶接位置決めの精度を高
くする必要があるが、クランプ装置は簡単な装置でもよ
く、耐食性向上の長所（後述）がある。In the case of fillet lap welding as shown in FIG. 3 (a), it is necessary to increase the precision of cutting and punching and the precision of welding positioning. However, a simple clamping device may be used and the corrosion resistance is improved. There are advantages (described later).
【００４１】一方、同図(b) または(c) のように代つき
溶接として、同図に示す幅Ｗが３〜１０ｍｍの範囲で許
容すれば、切断・打抜きの精度も溶接位置決め精度もさ
ほど高くする必要がなく、クランプ装置も簡単な装置で
製造可能である。On the other hand, if the width W shown in the figure is allowed in the range of 3 to 10 mm as marginal welding as shown in FIG. There is no need to increase the height, and the clamping device can be manufactured with a simple device.
【００４２】図５は本発明に係るブランクの材料の金属
板を重ねる方法を示す模式図であり同図(a) は完全重ね
方式、同図(b) は部分重ね方式、同図(c) は端面揃え重
ね方式の場合である。同図において図１〜４と同一部品
は同一符号で表す。FIGS. 5A and 5B are schematic views showing a method of laminating a metal plate of a blank material according to the present invention, wherein FIG. 5A is a complete lamination method, FIG. 5B is a partial lamination method, and FIG. Is the case of the end face alignment and overlapping method. In the figure, the same parts as those in FIGS.
【００４３】本発明の重ね方式は同図(a) 〜(c) のいず
れでも良い。同図(a) に示す完全重ね方式ではいずれか
の金属板が完全に他の金属板に接している。自動車部品
の部分補強を目的としたものではこの方式が最も一般的
である。The superposition method of the present invention may be any of the drawings (a) to (c). In the complete stacking method shown in FIG. 2A, one of the metal plates is completely in contact with the other metal plate. This method is the most common for partial reinforcement of automobile parts.
【００４４】同図(b) の部分重ね方式では、重なり部分
の面幅５は２次元としての広がりを有し、金属板Ａ１と
金属板Ｂ２とが同時に成形される。重なり部分の面幅５
は部分的に狭い部分があってもよいが、全ての部分で狭
い（例えば５ｍｍ未満）と、実質的に突き合わせ溶接と
なり、本発明の範囲外である。同図(b) の２枚の金属板
の部分重ね方式はプレス成形部品になったとき、いずれ
かの重ね線が外側に出てくるので外装用の部品には好適
ではない。In the partial stacking method shown in FIG. 3B, the surface width 5 of the overlapping portion has a two-dimensional spread, and the metal plate A1 and the metal plate B2 are formed simultaneously. Surface width of overlapping part 5
Although there may be a partially narrow portion, if all portions are narrow (for example, less than 5 mm), butt welding is substantially performed, which is outside the scope of the present invention. The partial overlap method of the two metal plates shown in FIG. 1B is not suitable for a part for exterior use since one of the overlapping lines comes out to the outside when a press-formed part is formed.
【００４５】同図(c) の端面揃え重ね方式は溶接前部品
の切断・打抜き精度および端面を揃える位置決め精度お
よび溶接の狙い精度が要求されるので本発明の長所が若
干失われる。The end face alignment and lapping method shown in FIG. 3C requires cutting / punching accuracy of the parts before welding, positioning accuracy for aligning the end faces, and aiming accuracy of welding, so that the advantages of the present invention are slightly lost.
【００４６】図６は３枚の金属板が重ね合わされている
各種の状態を示す模式図で、同図(a) は完全重ね、同図
(b) は部分重ね、同図(c) は端面揃え重ねの場合であ
る。同図において図１〜５と同一部品は同一符号で表
す。符号３は金属板Ｃであり、図５の２枚重ねの金属板
の構成に、さらに補強するための付加材に相当する。FIGS. 6A and 6B are schematic views showing various states in which three metal plates are superimposed. FIG.
(b) shows the case of partial overlap, and FIG. (c) shows the case of end face alignment. In the figure, the same parts as those in FIGS. Reference numeral 3 denotes a metal plate C, which corresponds to an additional material for further reinforcing the configuration of the two-layer metal plate shown in FIG.
【００４７】同図に示すように本発明においては金属板
が３枚もしくはそれ以上が接合されていてもよい。ま
た、本発明のブランクには、完全重ね、部分重ねおよび
端面揃え重ねが混在してもよい。As shown in the figure, in the present invention, three or more metal plates may be joined. Further, the blank of the present invention may include a mixture of a complete overlap, a partial overlap and an end face alignment overlap.
【００４８】本発明の一体成形用ブランクは、金属板の
重なった部分の輪郭線近傍で線溶接されており、この線
溶接部に対向する該輪郭線上の部分の近傍で少なくとも
１個所が線溶接によって結合されている。The blank for integral molding according to the present invention is wire-welded near the contour of the overlapping portion of the metal plate, and at least one portion is wire-welded near the portion on the contour facing the wire-welded portion. Are joined by
【００４９】輪郭線上の対向する線溶接の位置とは、そ
の位置で溶接されていると、ブランクの成形中、および
／または同部品の使用中に付加される金属板間のせん断
応力がバランスするような溶接位置同士をいう。The position of the opposing line welds on the contour line, when welded at that position, balances the shear stress between the metal plates applied during blank forming and / or use of the part. Such welding positions are referred to.
【００５０】図７は本発明の一体化成形ブランクにおけ
る線溶接位置を例示した模式図であり、同図(a-1) はコ
の字成形前の一体化成形用ブランク、同図(a-2) はこれ
を成形したもの、同図(b-1) は張り出し成形前の一体化
成形用ブランク、同図(b-2)はこれを成形したもの、同
図(c-1) は補強板となる金属板Ｂの形状がＣ字型となっ
た押し出し成形前の一体化成形用ブランク、同図(c-2)
はこれを成形したものである。同図において図１と同一
部品は同一符号で表す。同図を用いて、本発明の輪郭線
上で互いに対向する関係にある溶接線について説明す
る。FIG. 7 is a schematic view exemplifying a wire welding position in the integrated molding blank of the present invention, and FIG. 7 (a-1) is an integrated molding blank before U-shape molding, and FIG. Fig. 2 (b) is a molded product, Fig. (B-1) is a blank for integral molding before overhang molding, Fig. (B-2) is a molded product, and Fig. (C-1) is reinforcement The blank for integral molding before extrusion molding, in which the shape of the metal plate B to be a plate is C-shaped, FIG.
Is a molding of this. In the figure, the same parts as those in FIG. 1 are represented by the same reference numerals. With reference to the figure, the welding lines having a relationship facing each other on the contour line of the present invention will be described.
【００５１】図７(a-1) において、溶接線Ｘ〜Ｚは金属
板Ｂ２の輪郭線のやや内側にある。溶接線Ｘと溶接線Ｙ
とは輪郭線上で対向した位置にある。すなわち、同図(a
-2)のように成形するとき、溶接線ＸとＹとは金属板間
で溶接線方向のせん断応力を受けるが、互いにバランス
する。使用状態では例えば、梁構造として同図(a-2)の
上方から荷重を受ける負荷を受けるとき、溶接線ＸとＹ
とは同図左右方向に互いに逆方向のせん断応力を受ける
ため、両溶接線は対向した位置関係にある。しかし、同
図(a-1) の溶接線Ｚは対向する位置に溶接線はない。本
発明の一体化成形用ブランクでは、対向する位置で少な
くとも１個所線溶接によって結合されていることを要件
としているので、同図(a-1) の一体化成形用ブランクも
本発明範囲に属する。しかし、仮にＹとＺの溶接線のみ
であれば、本発明の要件を満たさない。In FIG. 7 (a-1), the welding lines X to Z are slightly inside the contour of the metal plate B2. Welding line X and welding line Y
Is located at a position facing the contour line. That is, FIG.
When forming as in -2), the welding lines X and Y receive shear stress in the direction of the welding line between the metal plates, but balance each other. In the use state, for example, when receiving a load receiving a load from above in FIG.
In this figure, since both sides receive shear stresses in opposite directions in the left-right direction in FIG. However, there is no welding line at the position facing the welding line Z in FIG. Since the blank for integral molding of the present invention is required to be joined by at least one line welding at opposing positions, the blank for integral molding of the same figure (a-1) also belongs to the scope of the present invention. . However, if only the Y and Z welding lines are used, the requirements of the present invention are not satisfied.
【００５２】図７(b-1) の場合、すみ肉溶接された溶接
線ＸとＹとが対向し、溶接線ＲとＳとが対向している。
同図(b-2) のように張り出し成形をするには、円盤状の
補強材の金属板Ｂ２の中心を対象軸にした溶接線を設け
るのが望ましいからであるからである。In the case of FIG. 7 (b-1), the weld lines X and Y of the fillet weld are opposed to each other, and the weld lines R and S are opposed to each other.
This is because it is desirable to provide a welding line centered on the center of the disk-shaped reinforcing metal plate B2 in the overhang forming as shown in FIG.
【００５３】図７(c-1) では溶接線Ｘに対して、溶接線
ＹおよびＺとが対向している。また、溶接線Ｒに対して
は、溶接線Ｓも溶接線Ｔも対向しているといえる。すな
わち、対向する溶接線とは、必ずしも本数が１：１で対
応するものではなく、成形時および／または使用時に互
いに逆方向のせん断応力が負荷されバランスする部分が
１：複数の対向関係もありうる。対向する溶接線同士の
溶接線長さが等しくなくてもよいが、溶接線長さの差ま
たは比は±２０％以内で等しくするのが好ましい。In FIG. 7 (c-1), the welding lines Y and Z are opposed to the welding line X. Also, it can be said that the welding line S and the welding line T are opposed to the welding line R. In other words, the facing welding line does not necessarily correspond to the number of welding lines at 1: 1. There is also a plurality of facing parts in which shear stresses in opposite directions are applied and balanced during molding and / or use. sell. The length of the welding line between the opposing welding lines may not be equal, but the difference or ratio of the length of the welding line is preferably equalized within ± 20%.
【００５４】本発明の一体化成形用ブランクでは、線溶
接の位置は金属板の輪郭線近傍とする。すみ肉溶接は輪
郭線上で溶接する。重ねレーザ溶接、重ねシーム溶接な
どで、溶接幅代をとる場合、輪郭線の近傍とは通常内側
１０ｍｍ以内の部分である。In the blank for integrated molding of the present invention, the position of the wire welding is near the contour of the metal plate. Fillet welding is performed on the contour line. When a welding width is taken by lap laser welding, lap seam welding or the like, the vicinity of the contour is usually a portion within 10 mm inside.
【００５５】溶接線の長さは長いほど好ましい。最小長
さは接合部の形状、プレス時の変形様式により異なるの
で一概に決めることはできないが、発明者らが行った試
験では、溶接長さが輪郭線の長さの５０％以上あれば、
溶接部での破断が起きていない。このことから、溶接線
の長さは重なった部分の輪郭線の長さの５０％以上の長
さを確保するのが好ましい。また、完全重ね方式では重
ねた金属板の周囲長さの５０％以上の長さとするのが好
ましい。The longer the length of the welding line, the better. Since the minimum length differs depending on the shape of the joint and the deformation mode at the time of pressing, it cannot be determined unconditionally. However, in the test conducted by the inventors, if the welding length is 50% or more of the length of the contour line,
No break at the weld. For this reason, it is preferable that the length of the welding line be 50% or more of the length of the contour line of the overlapped portion. In the complete stacking method, the length is preferably 50% or more of the peripheral length of the stacked metal plates.
【００５６】線溶接は一つの連続した溶接線でもよく、
また、断続した溶接線でもよい。つまり、全溶接長が１
００ｍｍとは１本の１００ｍｍの溶接線でも、１０ｍｍ
の溶接線が１０本ある場合でも良い。ただし、溶接線が
断続していると、非溶接部分への塗料の回り込みが悪
く、水が浸入した場合には重ね面内部から腐食が広がる
恐れがあるので連続した溶接線の方が好ましい。The line welding may be one continuous welding line,
Also, an intermittent welding line may be used. In other words, the total welding length is 1
00mm means 10mm even with one 100mm welding line
May be ten. However, if the welding line is intermittent, the paint does not easily flow into the non-welded part, and if water enters, corrosion may spread from the inside of the overlapped surface. Therefore, a continuous welding line is preferable.
【００５７】本発明では対向する位置同士に溶接線があ
れば、そのほかに点溶接、線溶接があっても差し支えな
い。輪郭線の中の中央部で補強のため線溶接または点溶
接を付加的に行ってもよい。In the present invention, as long as there are welding lines at opposing positions, other spot welding and line welding may be performed. Line welding or spot welding may be additionally performed at the center of the contour line for reinforcement.
【００５８】本発明のブランクを製造する際の溶接法は
線溶接であればどのような方法でもよく、抵抗溶接、溶
融溶接いづれの溶接法でもよい。抵抗溶接としては円盤
電極を用いた重ねシーム溶接があげられる。溶融溶接と
しては、ＭＡＧ溶接や炭酸ガス溶接のようなガスシール
ドメタルアーク溶接。ＴＩＧ溶接プラズマアーク溶接の
ようなガスシールド溶接。また、レーザビーム溶接や電
子ビーム溶接があげられる。The welding method for producing the blank of the present invention may be any method as long as it is line welding, and may be resistance welding or fusion welding. As the resistance welding, lap seam welding using a disk electrode is given. As fusion welding, gas shielded metal arc welding such as MAG welding and carbon dioxide gas welding. Gas shield welding such as TIG welding plasma arc welding. Also, laser beam welding and electron beam welding can be mentioned.
【００５９】本発明のブランクで重ねシーム溶接のよう
な抵抗溶接でも良好な表面品質を得ることは可能である
が、材料両面に電極が接触するため、電極による痕跡が
残る場合がある。Although good surface quality can be obtained by resistance welding such as lap seam welding with the blank of the present invention, traces may be left by the electrodes because the electrodes are in contact with both surfaces of the material.
【００６０】良好な表面を得るには、溶融溶接法では、
入熱面の反対側（下側）の金属板の下面（裏面）が溶融
しない条件（非貫通条件）で溶接するのが好ましい。溶
融溶接で裏面が溶融しない条件で溶接すると、裏面側は
熱影響によるテンパーカラーと称する変色が若干生じる
が、塗装後は溶接の痕跡が全く表れない。In order to obtain a good surface, in the fusion welding method,
It is preferable to perform welding under the condition that the lower surface (back surface) of the metal plate on the opposite side (lower side) of the heat input surface does not melt (non-penetrating condition). When welding is performed under the condition that the back surface does not melt by fusion welding, discoloration called a temper color occurs slightly on the back surface side due to heat, but no trace of welding appears after painting.
【００６１】この下面側を成形部品の外側にすれば、自
動車外板部品にも適用可能である。一般的に、外板の外
装面は金型のダイ側になるので、本発明での成形方法
は、金型のダイ側をブランクの裏面とするのがよい。If this lower surface is outside the molded part, the present invention can be applied to an automobile outer panel part. Generally, the exterior surface of the outer plate is on the die side of the mold, and therefore, in the molding method of the present invention, the die side of the mold is preferably used as the back surface of the blank.
【００６２】溶け込みの大きさは特に限定しないが、健
全な継手強度が得られ、かつ裏面の溶融を避けるため
に、裏面側（下板）の板厚の２５〜７５％程度の溶け込
み深さをねらうのが好ましいと考えられる。Although the size of the penetration is not particularly limited, a penetration depth of about 25 to 75% of the thickness of the back surface (lower plate) is required to obtain a sound joint strength and avoid melting of the back surface. It is considered preferable to aim.
【００６３】このような溶接条件は例えば、冷延鋼板の
レーザ溶接では、２枚の鋼板厚さが０．４〜６．０ｍｍ
（好ましくは０．６〜３．０ｍｍ）、炭酸ガスレーザ出
力１〜１０ｋＷ、焦点径０．０１〜１ｍｍ溶接速度１〜
１０ｍ／ｍｉｎとすれば、下側鋼板の板厚の２５〜７５
％程度が溶け込み、下面には溶融部がない状態が得られ
る。Such welding conditions are, for example, in laser welding of a cold rolled steel sheet, the thickness of the two steel sheets is 0.4 to 6.0 mm.
(Preferably 0.6 to 3.0 mm), carbon dioxide laser output 1 to 10 kW, focal diameter 0.01 to 1 mm, welding speed 1 to 1
If it is 10 m / min, the thickness of the lower steel plate is 25 to 75.
%, And a state in which the lower surface has no fused portion is obtained.
【００６４】本発明のブランクの長所を最大にするには
すみ肉重ね溶接を用いるのが望ましい。図４(b) または
(c) に示す代付き重ね溶接のように溶接代があると、エ
ッジ部でプレス成形の金型を痛める危険がある。また、
エッジ部は塗膜が乗りにくく、耐食性が劣る。さらに、
金属板間のすきまに塗料が回り込みにくく、すきま部の
耐食性も劣るためである。さらに、溶接代は部材の強度
に対する貢献が小さく、重量増加の悪影響もある。To maximize the advantages of the blank of the present invention, it is desirable to use fillet lap welding. Fig. 4 (b) or
If there is a welding margin like the lap welding with margin shown in (c), there is a risk of damaging the press-molding die at the edge. Also,
At the edge portion, the coating film is hard to ride, and the corrosion resistance is poor. further,
This is because the paint does not easily flow into the gap between the metal plates, and the corrosion resistance of the gap is inferior. Further, the welding margin has a small contribution to the strength of the member, and has an adverse effect of an increase in weight.
【００６５】これに対して、すみ肉重ね溶接とは、図３
(a) に示すように重ねた金属板の端部を溶接する方法で
ある。すみ肉溶接では金属板の端面が溶融し、これと接
する他の金属板も溶融して接合されるものである。すみ
肉溶接の溶接部の盛り上がりは、通常元の金属板の厚さ
以下であるため、プレス成形時、金型に疵を付けにくい
ので好ましい。あるいは、ＭＡＧ溶接やＴＩＧ溶接の場
合は溶接金属が金属板の輪郭線に沿って供給され双方の
金属板が接合される。溶接条件によっては供給された金
属が金属板の厚さ以上に盛り上がり、金型を傷つけた
り、成形品に圧痕をもたらしたりするので要注意であ
る。すみ肉重ね溶接においても裏面が溶融しない条件で
溶接することが望ましい。On the other hand, fillet lap welding corresponds to FIG.
This is a method of welding the ends of the stacked metal plates as shown in FIG. In fillet welding, an end face of a metal plate is melted, and other metal plates in contact with the end face are also melted and joined. The swelling of the welded portion of the fillet welding is usually less than the thickness of the original metal plate, and thus it is preferable because the mold is not easily damaged during press forming. Alternatively, in the case of MAG welding or TIG welding, the weld metal is supplied along the contour of the metal plate and both metal plates are joined. It is necessary to be careful because the supplied metal rises more than the thickness of the metal plate depending on the welding conditions, damaging the mold and causing indentations on the molded product. In fillet lap welding, it is desirable to perform welding under the condition that the back surface does not melt.
【００６６】[0066]
【実施例】（実施例１）炭酸ガスレーザ溶接を用いた従
来法の突き合わせ溶接によるブランクと、本発明の重ね
溶接によるブランクを多数に試作し、その不良率を調べ
た。EXAMPLES (Example 1) A large number of blanks produced by conventional butt welding using carbon dioxide laser welding and blanks produced by lap welding according to the present invention were produced on a trial basis, and their defect rates were examined.
【００６７】図８は本実施例１の試験片の形状を示す概
要図で、同図(a) は平面図、同図(b) 従来例の場合の側
面図、同図(b) は本発明例の場合の側面図である。同図
において図１〜６と同一部品は同一符号で表す。同図
(a) に示すように従来例の試験片は０．８ｍｍと１．６
ｍｍの冷延鋼板を突き合わせ溶接した。切断面はシャー
リングマシンにて切断した面である。FIG. 8 is a schematic view showing the shape of the test piece of the first embodiment. FIG. 8 (a) is a plan view, FIG. 8 (b) is a side view of the conventional example, and FIG. It is a side view in the case of an invention example. In the figure, the same parts as those in FIGS. Same figure
As shown in (a), the test piece of the conventional example is 0.8 mm and 1.6 mm.
mm cold-rolled steel plates were butt-welded. The cut surface is a surface cut by a shearing machine.
【００６８】一方、同図(b) に示すように本発明例の重
ね溶接によるブランクは０．８ｍｍの冷延鋼板上に０．
８ｍｍの冷延鋼板を重ね、その重ね部をすみ肉溶接し
た。溶接条件はいずれも出力３ｋＷ、溶接速度は５ｍ／
ｍｉｎである。On the other hand, as shown in FIG. 6B, the blanks obtained by lap welding of the present invention were prepared on 0.8 mm cold-rolled steel sheets.
8 mm cold-rolled steel sheets were overlapped, and the overlapped portions were fillet welded. The welding conditions were all 3kW output and the welding speed was 5m /
min.
【００６９】本発明例および従来例の試験片をそれぞれ
１００個作成し、溶接部を外観観察して不良品数を調べ
た。One hundred test pieces were prepared for each of the present invention and the conventional example, and the appearance of the weld was observed to determine the number of defective products.
【００７０】図９は試験片のレーザ溶接結果の外観を示
す模式図であり、同図(a) は突合わせ溶接の未架橋不良
の場合、同図(b) は突合わせ溶接のアンダカット不良の
場合、同図(c) は突合わせ溶接の良品の場合、同図(d)
は重ね溶接の良品の場合である。同図(a) の未架橋およ
び同図(b) のアンダカットを不良として数えた。FIGS. 9A and 9B are schematic diagrams showing the appearance of the results of laser welding of the test pieces. FIG. 9A shows the case where the butt welding is not cross-linked, and FIG. 9B shows the case where the butt welding is undercut. In the case of, the same figure (c)
Is the case of good lap welding. Uncrosslinked in FIG. 7A and undercut in FIG. 7B were counted as defective.
【００７１】溶接試験の結果、従来例のブランクでは３
７％のアンダーカットおよび６％の未架橋が生じた。一
方、本発明例では不良の発生は皆無であった。As a result of the welding test, the blank of the conventional example was 3
There was 7% undercut and 6% uncrosslinked. On the other hand, in the example of the present invention, no defect occurred.
【００７２】（実施例２）非直線の溶接線をもつブラン
クの溶接試験を行った。図１０は円状の溶接線をもつ試
験片の形状を示す概要図であり、同図(a) は平面図、同
図(b) は従来例の突合わせ溶接の場合の側面図、同図
(c) は本発明例の重ね溶接の場合の側面図である。同図
において図１と同一部品は同一符号で表す。Example 2 A welding test was performed on a blank having a non-linear welding line. FIG. 10 is a schematic view showing the shape of a test piece having a circular welding line. FIG. 10 (a) is a plan view, and FIG. 10 (b) is a side view of a conventional butt welding.
(c) is a side view in the case of the lap welding of the example of the present invention. In the figure, the same parts as those in FIG. 1 are represented by the same reference numerals.
【００７３】同図(a) に示すように、従来例の試験片は
０．８ｍｍおよび１．６ｍｍ厚の冷延鋼板をパンチによ
り円盤状の金属板Ｂ２を打ち抜き、開口部のある金属板
Ａ１はめ込んで溶接をした。As shown in FIG. 7A, the test piece of the conventional example is formed by punching a disc-shaped metal plate B2 from a cold-rolled steel plate having a thickness of 0.8 mm and 1.6 mm by punching, and forming a metal plate A1 having an opening. It was fitted and welded.
【００７４】本発明例の試験片は０．８ｍｍ厚の冷延鋼
板の金属板Ａ１と、０．８ｍｍ厚の円盤状の金属板Ｂ２
を重ね、すみ肉溶接した。従来例および本発明例とも、
材料を位置決めジグで位置をセットした後、ＮＣテーブ
ルを円形に動かして円溶接を行った。溶接条件は実施例
１と同様である。これらの試験片をそれぞれ１０個作成
した。The test piece of the present invention is made of a cold-rolled steel plate A1 having a thickness of 0.8 mm and a disk-shaped metal plate B2 having a thickness of 0.8 mm.
Were overlapped and the fillet was welded. In both the conventional example and the present invention,
After setting the position of the material with a positioning jig, the NC table was moved in a circular shape to perform circular welding. The welding conditions are the same as in the first embodiment. Each of these test pieces was made 10 pieces.
【００７５】溶接試験の結果、比較例では１０ヶともア
ンダカットが生じたのに対し、発明例では不良の発生は
皆無であった。As a result of the welding test, undercuts occurred in all of the ten comparative examples, whereas no defects occurred in the inventive examples.
【００７６】（実施例３）次に、ブランクの耐食性を調
査した。図１１は耐食試験用の試験片の形状を示す概要
図であり、同図(a) は従来例のレーザ溶接による突き合
わせ溶接の場合の側面図、同図(b) は従来例のスポット
溶接による重ね溶接の場合の側面図、同図(c) は本発明
例のレーザ溶接による重ね溶接の場合の側面図であり、
同図(c-1) は代付き重ね溶接で溶融部が貫通している場
合の側面図、同図(c-2) はすみ肉重ね溶接で溶融部が貫
通している場合の側面図、同図(c-3) はすみ肉重ね溶接
で非貫通の場合の側面図を示す。これらの試験片には２
０μｍの電着塗装を施し、表面と裏面の塩水噴霧試験行
った。耐食性の評価はさび発生までの時間（日数）を指
標とした。試験結果を表１に示す。Example 3 Next, the corrosion resistance of the blank was investigated. FIG. 11 is a schematic view showing the shape of a test piece for a corrosion resistance test. FIG. 11 (a) is a side view of a conventional example of butt welding by laser welding, and FIG. Side view in the case of lap welding, the same figure (c) is a side view in the case of lap welding by laser welding of the present invention example,
Fig. (C-1) is a side view of the case where the molten portion is penetrated by substitute lap welding, and Fig. (C-2) is a side view of the case where the molten portion is penetrated by the fillet lap welding. Figure (c-3) shows a side view in the case of non-penetration by fillet lap welding. These specimens have 2
A 0 μm electrodeposition coating was applied, and a salt spray test was performed on the front and back surfaces. The evaluation of corrosion resistance was based on the time (days) until the occurrence of rust. Table 1 shows the test results.
【００７７】同表に示すように従来例の試験片Ｎｏ．１
（突合わせ溶接、図１１(a) に相当）では表面（溶接入
熱側）裏面とも溶接部に腐食が発生した。溶接部は酸化
物を完全には除去していないので、溶接起因による酸化
物のため塗料皮膜の付着性を低め、耐食性が劣化したも
のと思われる。試験片Ｎｏ．２（スポット溶接、：図１
１(b) ）の場合、重ね合わせの端面が短時間で腐食し、
重ねた鋼板間にも赤錆が発生した。隙間には塗料回り込
まず耐食性を劣化させたものと思われる。試験片Ｎｏ．
３は（代付きレーザ溶接貫通、図１１(c-1) ：）本発明
例ではあるが、表面は試験片Ｎｏ．２と同様、短時間で
腐食した。表面端部の条件はＮｏ．２と同等のためであ
る。試験片Ｎｏ．４はレーザすみ肉溶接貫通（図(c-2)
）であり、表面の耐食性はＮｏ．１〜３よりも良好で
ある。裏面の溶融部は熱影響を受けて酸化しており、耐
食性はＮｏ．３より若干優れるものの十分ではなかっ
た。試験片Ｎｏ．５はレーザすみ肉溶接非貫通（図(c-
3) ）であり、表面溶接部の耐食性はＮｏ．４と同等で
あるが、裏面は溶接による溶融部がないため、耐食性が
極めて良好であった。As shown in the table, the test piece No. 1
In the butt welding (corresponding to FIG. 11 (a)), corrosion occurred in the weld on both the front surface (weld heat input side) and the back surface. Since the oxides were not completely removed from the welded portion, it is considered that the oxides caused by welding reduced the adhesion of the paint film and deteriorated the corrosion resistance. Test piece No. 2 (Spot welding: Fig. 1
In the case of 1 (b)), the end face of the overlap is corroded in a short time,
Red rust also occurred between the stacked steel sheets. It is considered that the corrosion resistance was degraded because the paint did not enter the gap. Test piece No.
No. 3 is an example of the present invention (laser welding penetration with a margin, FIG. 11 (c-1): Corrosion occurred in a short time as in the case of 2. The condition of the surface edge is No. Because it is equivalent to 2. Test piece No. 4 is laser fillet weld penetration (Figure (c-2)
), And the corrosion resistance of the surface is no. Better than 1-3. The melted portion on the back surface is oxidized under the influence of heat, and the corrosion resistance is No. 1. Although slightly better than 3, it was not enough. Test piece No. 5 is a laser fillet weld non-penetrating (Figure (c-
3)), and the corrosion resistance of the surface weld was 4, but the corrosion resistance was extremely good because there was no welded portion on the back surface.
【００７８】[0078]
【表１】 [Table 1]
【００７９】[0079]
【発明の効果】本発明によって安価なテーラードブラン
クが製造でき、また、切断線が非直線の材料にも適用可
能である。さらに、本発明を適用して得られた成形品は
耐食性・外観性にも優れ、自動車用外装材部品への適用
が可能である。According to the present invention, an inexpensive tailored blank can be manufactured, and the present invention can be applied to a material having a non-linear cutting line. Furthermore, the molded article obtained by applying the present invention is excellent in corrosion resistance and appearance, and can be applied to exterior parts for automobiles.
【図１】突合わせ溶接によるテーラードブランクの溶接
方式を示す模式図であり同図(a) はレーザ溶接、同図
(b) はマッシュシーム溶接の場合である。FIG. 1 is a schematic view showing a tailored blank welding method by butt welding, wherein FIG.
(b) shows the case of mash seam welding.
【図２】スポット溶接による一体成形用ブランクの溶接
部の概要を示す模式図である。FIG. 2 is a schematic view showing an outline of a welded portion of a blank for integral molding by spot welding.
【図３】スポット溶接と線溶接の比較を説明する模式図
であり同図(a) はスポット溶接試片の側面図、同図(b)
は線溶接の試片の側面図、同図(c) は線溶接でのプレス
割れの模式図である。FIG. 3 is a schematic view for explaining a comparison between spot welding and wire welding, wherein FIG. 3 (a) is a side view of a spot welding specimen and FIG. 3 (b).
FIG. 1 is a side view of a wire-welded specimen, and FIG. 2C is a schematic view of a press crack in wire welding.
【図４】本発明に係るブランクの溶接部付近の状態を示
す模式図で同図(a) はレーザ溶接またはアーク溶接によ
るすみ肉重ね溶接の場合、同図(b) はレーザ溶接または
アーク溶接による代つき重ね溶接の場合、同図(c) はシ
ーム溶接による代つき重ね溶接の場合である。FIGS. 4A and 4B are schematic diagrams showing the state of the vicinity of a welded portion of a blank according to the present invention. FIG. 4A shows a case of fillet lap welding by laser welding or arc welding, and FIG. (C) shows the case of the lap welding by seam welding.
【図５】本発明に係るブランクの材料の金属板を重ねる
方法を示す模式図であり同図(a) は完全重ね方式、同図
(b) は部分重ね方式、同図(c) は端面揃え重ね方式場合
である。FIG. 5 is a schematic view showing a method of stacking a metal plate of a blank material according to the present invention, wherein FIG.
(b) shows the case of the partial overlap method, and (c) shows the case of the end face alignment method.
【図６】３枚の金属板が重ね合わされている各種の状態
を示す模式図で、同図(a) は完全重ね、同図(b) は部分
重ね、同図(c) は端面揃え重ねの場合である。FIGS. 6A and 6B are schematic views showing various states in which three metal plates are overlapped, wherein FIG. 6A is a complete overlap, FIG. 6B is a partial overlap, and FIG. Is the case.
【図７】本発明の一体化成形ブランクにおける線溶接位
置を例示した模式図であり、同図(a-1) はコの字成形前
の一体化成形用ブランク、同図(a-2) はこれを成形した
もの、同図(b-1) は張り出し成形前の一体化成形用ブラ
ンク、同図(b-2) はこれを成形したもの、同図(c-1) は
補強板となる金属板Ｂの形状がＣ字型となった押し出し
成形前の一体化成形用ブランク、同図(c-2) はこれを成
形したものである。FIG. 7 is a schematic view illustrating a wire welding position in the integrated molding blank of the present invention, wherein FIG. 7 (a-1) is an integral molding blank before U-shape molding, and FIG. Fig. (B-1) is a blank for integral molding before bulging, Fig. (B-2) is a molded one, and Fig. (C-1) is a reinforcing plate. The metal plate B has a C-shape and is formed into a C-shaped blank for integral molding before extrusion molding. FIG.
【図８】試験片の形状を示す概要図で、同図(a) は平面
図、同図(b) 従来例の場合の側面図、同図(b) は本発明
例の場合の側面図である。8 (a) is a plan view, FIG. 8 (b) is a side view of a conventional example, and FIG. 8 (b) is a side view of an example of the present invention. It is.
【図９】試験片のレーザ溶接結果の外観を示す模式図で
あり、同図(a) は突合わせ溶接の未架橋不良の場合、同
図(b) は突合わせ溶接のアンダカット不良の場合、同図
(c) は突合わせ溶接の良品の場合、同図(d) は重ね溶接
の良品の場合である。FIG. 9 is a schematic view showing an appearance of a laser welding result of a test piece, in which FIG. 9A shows a case where butt welding is not cross-linked and FIG. 9B shows a case where butt welding is undercut. , The same figure
(c) shows the case of a good butt weld, and (d) shows the case of a good lap weld.
【図１０】円状の溶接線をもつ試験片の形状を示す概要
図であり、同図(a) は平面図、同図(b) は従来例の突合
わせ溶接の場合側面図、同図(c) は本発明例の重ね溶接
の場合の側面図である。FIG. 10 is a schematic view showing the shape of a test piece having a circular welding line, wherein FIG. 10 (a) is a plan view, and FIG. 10 (b) is a side view of the conventional butt welding; (c) is a side view in the case of the lap welding of the example of the present invention.
【図１１】耐食試験用の試験片の形状を示す概要図であ
り、同図(a) は従来例のレーザ溶接による突き合わせ溶
接の場合の側面図、同図(b) は従来例のスポット溶接重
ね溶接の場合の側面図、同図(c) は本発明例のレーザ溶
接による重ね溶接の場合の側面図であり、同図(c-1) は
代付き重ね溶接で溶融部が貫通している場合の側面図、
同図(c-2) はすみ肉重ね溶接で溶融部が貫通している場
合の側面図、同図(c-3) はすみ肉重ね溶接で非貫通の場
合の側面図を示す。FIG. 11 is a schematic view showing the shape of a test piece for a corrosion resistance test. FIG. 11 (a) is a side view of butt welding by laser welding of a conventional example, and FIG. 11 (b) is spot welding of a conventional example. Side view in the case of lap welding, FIG. 3 (c) is a side view in the case of lap welding by laser welding of the present invention example, and FIG. Side view,
FIG. 3 (c-2) is a side view of the case where the molten portion is penetrated by fillet lap welding, and FIG. 3 (c-3) is a side view of the case where no penetration is performed by fillet lap welding.
１：金属板Ａ ２：金属板Ｂ ３：金属板Ｃ ４：溶接部 ５：重なり部分の面幅 1: metal plate A 2: metal plate B 3: metal plate C 4: welded part 5: surface width of overlapping portion
Claims (4)
た部分の輪郭線の近傍で線溶接によって結合され、該輪
郭線上の該線溶接部に対向する部分の近傍で少なくとも
１個所線溶接によって結合されていることを特徴とする
一体化成形用ブランク。1. A superposed two or more metal plates are joined by wire welding near a contour of an overlapped portion, and at least one wire near a portion of the contour facing the wire weld. An integrated molding blank characterized by being joined by welding.
する請求項１に記載の一体化成形用ブランク。2. The integrated molding blank according to claim 1, wherein the line welding is fillet welding.
１面に線溶接起因の溶融部がないことを特徴とする請求
項１または２に記載の一体化成形用ブランク。3. The integrated molding blank according to claim 1, wherein at least one of the outer surfaces of the superposed metal plates has no molten portion caused by wire welding.
形において、請求項３に記載の一体化成形用ブランク
を、線溶接起因の溶融部のない面をダイ側にして成形す
ることを特徴とするブランクの一体化成形方法。4. The press forming using a punch and a die, wherein the blank for integral forming according to claim 3 is formed with the surface having no molten portion caused by wire welding being on the die side. An integrated molding method for blanks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10370523A JP2000197969A (en) | 1998-12-25 | 1998-12-25 | Blank for integrally forming and forming method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10370523A JP2000197969A (en) | 1998-12-25 | 1998-12-25 | Blank for integrally forming and forming method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000197969A true JP2000197969A (en) | 2000-07-18 |
Family
ID=18497139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10370523A Pending JP2000197969A (en) | 1998-12-25 | 1998-12-25 | Blank for integrally forming and forming method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000197969A (en) |
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