JP4786401B2 - Method for manufacturing butt-welded metal sheet - Google Patents

Method for manufacturing butt-welded metal sheet Download PDF

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JP4786401B2
JP4786401B2 JP2006112346A JP2006112346A JP4786401B2 JP 4786401 B2 JP4786401 B2 JP 4786401B2 JP 2006112346 A JP2006112346 A JP 2006112346A JP 2006112346 A JP2006112346 A JP 2006112346A JP 4786401 B2 JP4786401 B2 JP 4786401B2
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博雄 石橋
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Nippon Steel Corp
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本発明は、金属薄板のレーザー突合せ溶接による突合せ溶接金属板(テーラードブランク材)の製造方法に関するもので、更に詳しくは、プレス等の塑性加工に供される溶接金属薄板をレーザー突合せ溶接することで突合せ溶接金属板とする製造方法に関するものである。   The present invention relates to a method of manufacturing a butt weld metal plate (tailored blank material) by laser butt welding of a metal thin plate, and more specifically, by laser butt welding a weld metal thin plate used for plastic working such as a press. The present invention relates to a method of manufacturing a butt weld metal plate.

近年、レーザー溶接により複数の金属板を事前に突合せ接合し、その金属板をプレス成型等の塑性加工による二次加工にて所望の形状に成型する技術の適用が、自動車向けとして一般化しつつある。異種または異厚の金属板をプレス成型以前に接合し(例えば、特許文献1参照)、一枚の金属板としてプレスを行えば、製品の部分的な補強や軽量化を促す効果がある。   In recent years, the application of a technology for joining a plurality of metal plates in advance by laser welding and forming the metal plates into a desired shape by secondary processing by plastic processing such as press molding is becoming common for automobiles. . If different types or different thickness metal plates are joined before press molding (see, for example, Patent Document 1) and pressed as a single metal plate, there is an effect of promoting partial reinforcement and weight reduction of the product.

レーザーによる突合せ溶接時に生じる問題点は、レーザー光の集光性が高いため、端面でもって互いに接しあう薄板をきわめて正確に位置決めして溶接する必要であり、かつ薄板が薄板間に極狭いギャップを有することしか許さない点にある。良好な溶接シーム品質を得るためには原則としてギャップは0.05〜0.08mm幅を有することしか許されない。このことは取りも直さず両薄板各々が同一直線状から0.04mmの偏差しか許されないことを意味している。   The problem that arises during laser butt welding is the high condensing ability of the laser beam, so it is necessary to position and weld the thin plates that are in contact with each other very precisely at the end face, and the thin plate has an extremely narrow gap between the thin plates. It is in the point which only allows it to have. In order to obtain good weld seam quality, in principle the gap is only allowed to have a width of 0.05 to 0.08 mm. This means that both the thin plates are allowed only a deviation of 0.04 mm from the same straight line.

異種または異厚の金属板(テーラードブランク材と称される)の製造は、ジグもしくはパレット上に素材となる金属板(以下ブランク板と称することがある)を並べてその突合せ線に沿って溶接トーチを動かして溶接を行うことが多い。例えば、図7に示すように、突合せた鋼板10、鋼板11同士のギャップ部分にレーザートーチ12からレーザービーム14を溶接ゾーン16に照射し、レーザートーチを突合せ線に沿って溶接進行方向15に移動もしくは、固定されたレーザートーチに対し鋼板を溶接進行方向15に移動しながら、溶接ビード13を形成してテーラードブランク材とするものである。   Manufacture of dissimilar or different thickness metal plates (referred to as tailored blanks) is a welding torch along the butt line by arranging metal plates (hereinafter sometimes referred to as blank plates) on a jig or pallet. In many cases, welding is performed. For example, as shown in FIG. 7, a laser beam 14 is irradiated to a welding zone 16 from a laser torch 12 to a gap portion between the butt steel plates 10 and 11, and the laser torch is moved in the welding progress direction 15 along the butt line. Alternatively, the weld bead 13 is formed while the steel plate is moved in the welding progress direction 15 with respect to the fixed laser torch to obtain a tailored blank material.

このようにテーラードブランク材を製造する場合、ブランク板は既に打ち抜きプレスなどで精密に外形をせん断加工したものである。例えば、図1に示すような3枚の金属板(ブランク板)1、2、3を突合せて溶接線5及び溶接線6に沿ってレーザー溶接してテーラードブランク材を製造する場合には、突合せ角度(θ)4を精密にせん断する必要がある。突合せ角度を精密にするものではないが、溶接工程において、一対の被溶接部材を突合せ溶接するに先立ち、その端面を研削加工することにより端面精度を向上させて溶接性度の向上を図ったレーザー溶接システムは提案されている(例えば、特許文献2参照)。   Thus, when manufacturing a tailored blank material, the blank board has already sheared the outer shape with a punching press or the like. For example, when manufacturing a tailored blank material by laser welding along the weld line 5 and the weld line 6 by joining three metal plates (blank plates) 1, 2 and 3 as shown in FIG. It is necessary to precisely shear the angle (θ) 4. Although the butt angle is not precise, a laser that improves the end face accuracy and improves the weldability by grinding the end faces before butt welding the pair of welded members in the welding process. A welding system has been proposed (see, for example, Patent Document 2).

また、複数の薄鋼板を互いに突合せて仮付け溶接により固定し、その固定状態で、薄鋼板の突合せ部をコイニング加工して、ビード幅を狭めた後、突合せ部をレーザー溶接する方法も提案されている(例えば、特許文献3参照)が、この方法ではコイニング加工が要求され、生産性の向上に問題がある。   In addition, a method is also proposed in which a plurality of thin steel plates are butted together and fixed by tack welding, and the butt portion of the thin steel plate is coined in the fixed state to narrow the bead width, and then the butt portion is laser welded. However, this method requires coining and has a problem in improving productivity.

突合せ角度(θ)があるテーラードブランク材を製造する場合には、もしもこの突合せ角度が不正確な場合には、図6に示すように突合せギャップが大きな突合せギャップ7に拡大し、レーザー溶接することができず、かつ溶接品質に影響を及ぼす。レーザー突合せ溶接に要求される突合せギャップを0.08mm以下とするためにはこの突合せ角度の精度を、設計値の0.005〜0.01度の誤差範囲内でブランク板にすることが求められ、工業的にこれを実現するのはどのような精密な金型を持ってしても現在の技術では困難である。   When manufacturing tailored blanks with a butt angle (θ), if this butt angle is inaccurate, the butt gap is enlarged to a larger butt gap 7 as shown in FIG. 6 and laser welding is performed. Cannot be performed, and the welding quality is affected. In order to make the butt gap required for laser butt welding 0.08 mm or less, it is required that the accuracy of the butt angle be a blank plate within an error range of 0.005 to 0.01 degrees of the design value. It is difficult to achieve this industrially with the current technology, no matter what precision mold is used.

突合せレーザー溶接に突合せギャップが生じる場合は、従来技術においては、例えばフィラーワイヤーを用いてそのギャップを埋める必要があった(例えば、特許文献4参照)。しかし、その場合、フィラーワイヤー供給装置が必要で設備投資が嵩むという問題があった。又ギャップ量変動が大きい場合にはそれに応じてフィラーワイヤーの供給速度を変える必要があり、その制御機構は、自動ギャップ測定装置を含み複雑なものである。
本発明は、突合せギャップの生じやすい3枚以上の金属板を溶接する突合せ溶接金属板の製造方法においても容易にレーザー溶接を可能とする技術を提供しようとするものである。
When a butt gap is generated in butt laser welding, in the conventional technique, it is necessary to fill the gap using, for example, a filler wire (see, for example, Patent Document 4). However, in that case, there is a problem that a filler wire supply device is required and the capital investment increases. When the gap amount fluctuation is large, it is necessary to change the supply speed of the filler wire accordingly, and the control mechanism is complicated including an automatic gap measuring device.
The present invention intends to provide a technique capable of easily performing laser welding even in a method of manufacturing a butt-welded metal plate in which three or more metal plates that are likely to generate a butt gap are welded.

テーラードブランクの材料となるブランク板は、その圧延時や熱処理時に発生した残留歪や残留応力を大なり小なり内部に抱合しており、これを型抜きプレスを用いて所望の形状のブランク板としても、その時点で残留歪や残留応力の開放により形状が崩れてしまう。   The blank plate, which is the material for tailored blanks, has the residual strain and residual stress generated during rolling and heat treatment entrapped in the interior to a greater or lesser extent, and this is used as a blank plate of the desired shape using a die-cutting press. However, at that time, the shape collapses due to the release of residual strain and residual stress.

したがって、たとえどのような精度のブランク金型をもってしても、このような高い精度で安定的にブランク板を製造することは出来ない。このような理由から、図1に示すような3枚の金属板を突合せ溶接してなるテーラードブランク材、若しくは、図2に示すような4枚の金属板を突合せ溶接してなるテーラードブランク材は歩留まり落ちによるコスト増を抱えながら製造されているのが現状である。   Therefore, even if it has a blank metal mold | die of what precision, a blank board cannot be manufactured stably with such a high precision. For this reason, a tailored blank material formed by butt welding three metal plates as shown in FIG. 1 or a tailored blank material formed by butt welding four metal plates as shown in FIG. Currently, it is manufactured with increased costs due to falling yields.

特開平5−57467号公報JP-A-5-57467 特開2004−243393号公報JP 2004-243393 A 特開平6−238472号公報JP-A-6-238472 特開平5−50274号公報JP-A-5-50274

そこで、本発明は上記のような現状に鑑み、3枚以上の金属板を突合せ溶接してなる、突合せ溶接金属板(テーラードブランク材)において、溶接する金属板の精密な打ち抜き加工の必要性を排除し、歩留まり落ちすることなく、工業的に安定して3枚以上の金属板を溶接して最初の突合せ溶接の溶接線と次の突合せ溶接の溶接線の交わる角度が鋭角の突合せ角度θを有する突合わせ溶接金属板を製造することができる、突合せ溶接金属板(テーラードブランク材)の製造方法を提供するものである。 Therefore, in view of the present situation as described above, the present invention relates to the need for precise punching of a metal plate to be welded in a butt weld metal plate (tailored blank material) formed by butt welding three or more metal plates. Eliminate and industrially stably weld 3 or more metal plates without dropping yield, and the angle where the weld line of the first butt weld and the weld line of the next butt weld intersect is an acute butt angle θ. it is possible to produce a butt weld metal plate having, there is provided a method for producing a butt welding metal sheets (tailored blank).

かかる課題を解決するための手段として本発明者は、3枚以上の金属板を突合せ溶接してなる、突合せ溶接金属板を製造するに際して、最初に2枚の金属板を突合せ溶接した後、当該突合せ溶接金属板に切断加工を行い、別の3枚目の金属板の切断加工を行った端面に切断加工をした突合せ溶接金属板の切断端面を突合せ次の突合せ溶接して製造することで、精密な打ち抜き加工の必要性を排除し、工業的に安定して最初の突合せ溶接の溶接線と次の突合せ溶接の溶接線の交わる角度が鋭角の突合せ角度θを有する突合せ溶接金属板(テーラードブランク)を製造することができることを見出して本発明を完成した。 As a means for solving such a problem, the present inventor, when manufacturing a butt weld metal plate formed by butt welding three or more metal plates, first butt welds two metal plates, perform cutting in butt welding metal plate, possible to butt the cut edge of the butt weld the metal plate was cut into the end face was cut in different third sheet metal plate is prepared by following butt welding Thus, the need for precise punching is eliminated, and the butt-welded metal plate having an acute butt angle θ where the angle between the weld line of the first butt weld and the weld line of the next butt weld is an industrially stable ( The present invention was completed by finding that a tailored blank material could be produced.

本発明の要旨は、以下の通りである。   The gist of the present invention is as follows.

(1) 3枚の金属板(1、2、3)をレーザー突合せ溶接してなる、突合せ溶接金属板の製造方法において、2枚の金属板(1、2)の端面を突合せ、突合せ部をレーザー溶接して突合せ溶接金属板(a1)を作製した後、当該突合せ溶接金属板(a1)の突合せ溶接した溶接線(6)横切る切断線で当該突合せ溶接金属板(a1)の切断加工(9)を行い、引き続き切断加工した当該突合せ溶接金属板(a1)の切断加工端面を別の金属板(3)の端面に、当該突合せ溶接金属板(a1)の溶接線(6)と前記別の金属板(3)の端面との突合せ角度(θ)が鋭角となるように突合せ、突合せ部に溶接線(5)を形成するレーザー突合せ溶接(17)することを特徴とする、溶接線が鋭角の突合せ角度θを有する突合せ溶接金属板の製造方法。 (1) formed by laser butt welding three metal plates (1,2,3), in the manufacturing method of butt welding metal plate, abutting the end face of the two metal plates (1, 2), the butt portion After laser welding to produce a butt-welded metal plate (a1) , the butt-welded metal plate (a1) is cut by a cutting line across the butt-welded weld line (6) of the butt-welded metal plate (a1) ( 9) and the cutting end face of the butt-welded metal plate (a1), which has been cut, is applied to the end face of another metal plate (3) and the weld line (6) of the butt-welded metal plate (a1) The welding line is characterized in that the butting angle (θ) with the end face of the metal plate (3) is abutted so as to be an acute angle, and laser butt welding (17) is performed to form a welding line (5) at the butting portion. manufacture of butt welding metal plate having an acute butt angle θ Law.

4枚の金属板(1、2、3、8)をレーザー突合せ溶接してなる、突合せ溶接金属板の製造方法において、2枚ずつの金属板(1、2および3、8)の端面をそれぞれ突合せ、突合せ部をレーザー溶接して2枚の突合せ溶接金属板(a2、a3)を作製した後、当該夫々の突合せ溶接金属板(a2、a3)について突合せ溶接したそれぞれの溶接線(6a、6b)を横切る切断線で当該それぞれの突合せ溶接金属板の切断加工(17)を行い、引き続き切断加工した当該それぞれの突合せ溶接金属板(a2、a3)の切断加工端面を、当該それぞれの突合せ溶接金属板(a2、a3)の各溶接線(6a、6b)と当該それぞれの突合せ溶接金属板(a2、a3)の端面との突合せ角度(θ)が鋭角となるように突合せ、突合せ部に溶接線(5)を形成する突合せレーザー溶接することを特徴とする、溶接線が鋭角の突合せ角度θを有する突合せ溶接金属板の製造方法。 ( 2 ) In a method for producing a butt-welded metal plate formed by laser butt welding four metal plates (1 , 2, 3, 8), two metal plates (1, 2, and 3, 8) Each end face is butted and laser welding is performed on the butted portion to produce two butt welded metal plates (a2, a3), and then each weld line (butting welded on each of the butt welded metal plates (a2, a3)) ( 6a, 6b) is cut along the respective butt-welded metal plates (17) along the cutting line, and the cut end faces of the respective butt-welded metal plates (a2, a3) are cut into the respective butt-welded metal plates (a2, a3) . Butt and butt sections so that the butt angle (θ) between each weld line (6a, 6b) of the butt weld metal plate (a2, a3) and the end face of each butt weld metal plate (a2, a3) is an acute angle Dissolved in Characterized by butt laser welding to form a line (5) The method of butt welding the metal plate weld line has an acute butt angle theta.

前記突合せ部をレーザー溶接して作製する突合せ溶接金属板(a1、a2またはa3)は、3枚以上の金属板を並列して突合せ、突合せ部をレーザー溶接した突合せ溶接金属板であることを特徴とする上記(1)または(2)に記載の溶接線が鋭角の突合せ角度θを有する突合せ溶接金属板の製造方法。 (3) the butt welding metal plate making by laser welding the butted portion (a1, a2 or a3) is butt in parallel three or more metal plates, are butt-welded metal plate was laser welded butt portion A method for producing a butt-welded metal sheet, wherein the weld line according to (1) or (2) has an acute butt angle θ .

本発明によれば、3枚以上の金属板をレーザー突合せ溶接してなる、突合せ角度θを持つ突合せ溶接金属板(テーラードブランク材)を製造する場合に、突合せ溶接金属板(ブランク板)の精密な打ち抜き加工の必要性を排除し、工業的に安定して製造することができるという顕著な効果を奏する。 According to the present invention, when producing a butt weld metal plate (tailored blank material) having a butt angle θ formed by laser butt welding three or more metal plates, the precision of the butt weld metal plate (blank plate) is obtained. This eliminates the need for a punching process, and has a remarkable effect that it can be manufactured industrially stably.

以下図を参酌して本発明を詳細に説明する。
図1は、3枚の金属板(ブランク板)を突合せ溶接してなる突合せ溶接金属板(以下テーラードブランク材ということがある)の製造例を示す図である。
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a manufacturing example of a butt-welded metal plate (hereinafter sometimes referred to as a tailored blank material) formed by butt welding three metal plates (blank plates).

図1に示すような3枚の金属板(ブランク板)1、2及び3を突合せて、溶接線5及び溶接線6に沿ってレーザー溶接してテーラードブランク材を製造する場合には、突合せ角度(θ)4を精密にせん断する必要がある。例えば、板厚の異なる薄鋼板を突合せ溶接する場合に、レーザー溶接では、ビード幅が狭いため溶接部での厚みの変化が大きく、溶接鋼板をプレス成形すると、板厚の薄い鋼板側の溶接部近傍に応力が集中し、溶接部近傍に割れが発生しやすい。また、レーザー溶接でビード幅が広いとレーザー出力を増加、あるいは溶接速度を低下させてもレーザー光線は薄鋼板を貫通して良好なビードを形成することが困難である。したがって、プレス成形性の良い突合せ溶接薄鋼板を得るためには、適正で精度の良いビード幅とすることが要求される。   When a tailored blank material is manufactured by welding three metal plates (blank plates) 1, 2 and 3 as shown in FIG. (Θ) 4 needs to be sheared precisely. For example, when butt welding thin steel plates with different plate thicknesses, laser welding has a large bead width, so the change in the thickness of the welded portion is large. Stress concentrates in the vicinity, and cracks are likely to occur near the weld. Further, if the bead width is wide by laser welding, it is difficult for the laser beam to penetrate the thin steel plate to form a good bead even if the laser output is increased or the welding speed is decreased. Therefore, in order to obtain a butt welded thin steel sheet with good press formability, it is required to have an appropriate and accurate bead width.

通常、十分な精度をもった金型によって突合せ溶接金属板(鋼板ブランク板)を打ち抜き加工をしても、鋼板ブランク時における製品の角度精度は最大0.1度程度の誤差が見込まれる。突合せ角度のばらつきが正規分布であると仮定し、所要突合せ角度を0.005度とすれば、それを満足する確率は0.12と予想される。図1に示すような溶接線が交わる状態で溶接した3枚のブランクからなるテーラードブランク材としては、金属板1及び金属板2の突合せ角が同時に所要突合せ精度範囲内でないと成立しないので、所要突合せ角度となる確率は0.014である。ゆえに、従来技術のように、既にブランクした金属板を一度にパレット上に突合せて、その突合せ線に沿って溶接を行う場合の、工程歩留まりは1.4%と予想され、従来技術では工業的に成り立たない。   Normally, even if a butt-welded metal plate (steel plate blank plate) is punched out with a mold having sufficient accuracy, an error of about 0.1 degree in the maximum angle accuracy of the product at the time of steel plate blank is expected. If the variation in the butt angle is assumed to be a normal distribution and the required butt angle is 0.005 degrees, the probability of satisfying it is expected to be 0.12. As a tailored blank material consisting of three blanks welded in a state where the welding lines as shown in FIG. 1 cross, the butt angle of the metal plate 1 and the metal plate 2 cannot be established unless they are within the required butt accuracy range at the same time. The probability of a butt angle is 0.014. Therefore, the process yield is expected to be 1.4% when the already blanked metal plate is butted on the pallet at the same time and welding is performed along the butt line as in the prior art. It does not hold.

そこで、本発明は一度金属板を突合せ溶接した後、当該突合せ溶接金属板に切断加工を行い、別の金属板の切断加工を行った端面に突合せ溶接して突合せ溶接金属板を製造することで、突合せする金属板の精密な打ち抜き加工の必要性を排除し、工業的に安定してプレス成形性の良い突合せ溶接金属板(テーラードブランク)を製造することができるようにしたものである。   Therefore, the present invention is to manufacture a butt welded metal plate by butt welding a metal plate once, then cutting the butt welded metal plate, and butt welding the end surface of the other metal plate cut. This eliminates the need for precise punching of the metal plates to be butt-joined, and makes it possible to produce a butt-welded metal plate (tailored blank) that is industrially stable and has good press formability.

図3〜図5は、本発明による、テーラードブランク材の製造手順を示す図である。   3-5 is a figure which shows the manufacturing procedure of the tailored blank material by this invention.

先ず、図3に示すように、2枚の金属板1と金属板2とを溶接線6に沿って突合せ溶接して突合せ溶接金属板とする。次に、図4に示すように、突合せ溶接金属板a1の次の溶接予定線(最初の溶接線と交わる溶接線となる)をせん断装置にてせん断加工(切断加工)9する。せん断加工を行なう際には、切断加工時にその切断線に一回目(最初)の溶接線6を含む(横切る)ように行ない、他の金属板との突合せ端面を形成する。次に、図5に示すように、せん断加工を行った突合せ溶接金属板a1のせん断線に次の3枚目の金属板3ブランク材を突合せてレーザー突合せ溶接17をする。 First, as shown in FIG. 3, the two metal plates 1 and 2 are butt welded along the weld line 6 to obtain a butt weld metal plate . Next, as shown in FIG. 4, the next welding planned line of the butt weld metal plate a1 (which becomes a welding line intersecting with the first welding line) is sheared (cut) 9 by a shearing device. When the shearing process is performed, the first (first) welding line 6 is included (crossed) in the cutting line at the time of the cutting process to form a butt end face with another metal plate. Next, as shown in FIG. 5, laser butt welding 17 is performed by butting the next third metal plate 3 blank material to the shear line of the butt- welded metal plate a <b> 1 subjected to the shearing process.

このことにより、図1のような突合せ角度(θ)があるテーラードブランク材を、溶接前に金属板の精密な打ち抜き加工を行う必要性を排除し、工業的に安定して製造することが可能となる。たとえ突合せ溶接する3枚目の金属板(ブランク板)の突合せ角度が、設計値の0.005〜0.01度の誤差範囲に入っていなくても、溶接を実施する前に一度せん断加工(切断加工)を実施することによって、突合せ予定線の直線度を問題無い状態にすることが出来、多少不正確なせん断形状のものでも品質上問題なく溶接線6と溶接線5とが鋭角の突合せ角度(θ)4を有する突合せ溶接金属板(テーラードブランク材)を製造することが可能である。 This makes it possible to manufacture tailored blanks with a butt angle (θ) as shown in Fig. 1 in an industrially stable manner, eliminating the need for precise punching of metal plates before welding. It becomes. Even if the butt angle of the third metal plate (blank plate) to be butt welded is not within the error range of 0.005 to 0.01 degrees of the design value, it is sheared once before performing welding ( By performing the cutting process, the straightness of the butt planned line can be made into a problem-free state, and even if the shape is somewhat inaccurate, the weld line 6 and the weld line 5 have a sharp angle butt without any quality problem. It is possible to manufacture a butt weld metal plate (tailored blank material) having an angle (θ) 4 .

また、図2に示すような溶接線(6a、6b)と溶接線5とが90度未満の鋭角の突合せ角度(θ)4で2箇所存在する状態となる4枚の金属板を突合せ溶接した突合せ溶接金属板(テーラードブランク材を製造する場合には、先ず2枚の金属板1及び2並びに金属板3及び8を別々に最初に2枚ずつ突合せ溶接して2枚の突合せ溶接金属板(a2、a3)を作製する。次に、突合せ溶接した夫々の突合せ溶接金属板(a2、a3)の溶接予定線をせん断装置にて、図4に示す突合せ溶接金属板の例の場合と同様に、突合せ溶接金属板(a2、a3)をせん断加工(切断加工)する。切断加工時に切断線に予めなされた溶接線5を含むように行ない突合せ端面を形成する。次いで、2枚の突合せ溶接金属板(a2、a3)を溶接予定線で突合せて溶接線5となるレーザー突合せ溶接する。このような溶接手順で溶接することにより、2つの突合せ角度θを持ったテーラードブランク材を、溶接前に金属板の精密な打ち抜き加工を行うことなしに製造することができる。なお、最初に2枚の金属板を突合せ溶接して突合せ溶接金属板(テーラードブランク半製品)としたが、必要に応じて図示してないが2枚の場合と同様に、3枚以上の金属板を並列させて最初に突合せ溶接して突合せ溶接金属板(テーラードブランク半製品)としも良い。これによって、複数の金属板を突合せ溶接したテーラードブランク材が得られる。また、上記に説明した、図1または図2の製造手順を組み合わせて、繰り返し行なうことによって複数の突合せ角度θを持ったテーラードブランク材を製造することが可能となる。 Further, four metal plates in which two welding lines (6a, 6b) and a welding line 5 as shown in FIG. 2 exist at two acute butt angles (θ) 4 of less than 90 degrees are butt welded. When producing butt-welded metal plates ( tailored blanks ) , first, two metal plates 1 and 2 and metal plates 3 and 8 are first butt-welded separately, and then two butt-welded metal plates. (A2, a3) are produced . Next, in the same manner as in the case of the butt weld metal plate shown in FIG. 4, the welding line of each butt weld metal plate (a2, a3) butt welded is measured with a shearing device . a3) is sheared (cut). A butt end face is formed by including the weld line 5 made in advance in the cutting line during the cutting process. Next, the two butt-welded metal plates (a2, a3) are butt-welded at the planned welding line to be laser butt-welded to become the weld line 5 . By welding in such a welding procedure, a tailored blank material having two butting angles θ can be manufactured without performing precise punching of a metal plate before welding. Although two metal plates were first butt welded to produce a butt-welded metal plate (tailored blank semi-finished product) , three or more metals were used as required, although not shown if necessary. It is good also as a butt-welded metal plate (tailored blank semi-finished product) by carrying out butt welding first with a parallel plate. Thereby, the tailored blank material which butt-welded the some metal plate is obtained. Moreover, it becomes possible to manufacture a tailored blank material having a plurality of butt angles θ by repeatedly combining the manufacturing procedures described above with reference to FIG. 1 or FIG.

本発明のテーラードブランク材を製造するために使用する少なくとも1枚の金属板は、板厚2mm以下、特に1mm以下の薄鋼板を使用することが好ましい。そして、突合せ溶接する薄鋼板は、板厚及び強度の一方又は双方が異なる薄鋼板を使用することができる。また、このような薄鋼板を突合せ溶接する場合には、レーザー突合せ溶接によって溶接することが適している。即ち,アーク溶接等の他の溶接方法では、溶接入力が過大となり、薄鋼板の溶接では溶け落ち欠陥が発生するからである。また、特に、鋭角の突合せ角度を有するテーラードブランク材の製造は困難であるが、本発明によれば容易に製造することができる。   The at least one metal plate used for producing the tailored blank material of the present invention is preferably a thin steel plate having a thickness of 2 mm or less, particularly 1 mm or less. And the thin steel plate which butt-welds can use the thin steel plate from which one or both of board thickness and intensity | strength differs. Moreover, when butt welding such a thin steel plate, it is suitable to weld by laser butt welding. That is, in other welding methods such as arc welding, the welding input becomes excessive, and when a thin steel plate is welded, a burn-out defect occurs. In particular, although it is difficult to manufacture a tailored blank material having an acute butt angle, according to the present invention, it can be easily manufactured.

実施例に基づいて本発明を説明する。
図1に示すように鋭角の突合わせ角度(θ)を有する板厚が異なる突合せ溶接金属板(テーラードブランク材を製造する溶接試験を実施した。試験に供した金属板1は厚さ1.4mmの軟鋼板、金属板2は厚さ1.2mmの軟鋼板、金属板3は厚さ1.0mmの軟鋼板である3板の金属板を用いた。トータルのテーラードブランク材の完成サイズは約1m×1mとした。
The present invention will be described based on examples.
As shown in FIG. 1, the welding test which manufactures the butt-welded metal plate ( tailored blank material ) from which the plate | board thickness which has an acute butt angle ((theta)) from which thickness differs was implemented. The metal plate 1 subjected to the test is a mild steel plate having a thickness of 1.4 mm, the metal plate 2 is a mild steel plate having a thickness of 1.2 mm, and the metal plate 3 is a mild steel plate having a thickness of 1.0 mm. Using. The finished size of the total tailored blank was about 1 m × 1 m.

(比較例)
先ず、従来技術として、ブランク工程でそれぞれせん断した3枚の金属板を平らな定盤上で並べて突合せ、金属板上面からエアシリンダーにてクランプして固定した。そして、3枚の金属板の突合せた溶接線(突合せ角度θ:80度)に沿って炭酸ガスレーザーを照射しながら溶接(出力1.5kw、溶接速度2.0m/min)を行いテーラードブランク材を製造した。このようにして100枚のテーラードブランク材を製造し、プレス加工を行ったところ、突合せギャップ起因による溶接不良が原因で、98枚にプレス加工時に溶接部の割れが発生し、良品は2枚しか採取することが出来無かった。
(Comparative example)
First, as a conventional technique, three metal plates each sheared in a blank process were arranged and butted on a flat surface plate, and clamped and fixed from the upper surface of the metal plate with an air cylinder. The weld line (butt angle theta: 80 degrees) which butt of three metal plates along the weld while irradiating a carbon dioxide gas laser (output 1.5 kw, welding speed 2.0 m / min) line have tailored blanks to The material was manufactured . In this way, 100 tailored blanks were manufactured and pressed. As a result of welding failure due to the butt gap, cracks in the welded part occurred during the press processing on 98 sheets, and only 2 non-defective products were produced. It was not possible to collect.

(発明例)
これに対し、本発明技術を適用して、先ずブランクとした2枚の金属板1および2を平らな定盤上で並べて突合せ、最初に従来技術と同様に炭酸ガスレーザーで突合せ溶接した後、その金属板1及び2からなるテーラードブランクの半完成品と、これと突合せ溶接する金属板3との突合せ溶接予定線を、せん断装置にてせん断加工し、金属板1及び2からなるテーラードブランクの半完成品に金属板3を鋭角の突合せ角度(θ)4で突合せ、炭酸ガスレーザーで突合せ溶接して突合せ溶接金属板(テーラードブランク材)を製造した。このようにして100枚製造し、プレス加工を行ったところ、突合せギャップ起因による溶接不良が原因で、1枚しかプレス加工時に溶接部の割れが発生せず、良品は99枚採取することが出来た。
(Invention example)
On the other hand, by applying the technology of the present invention, first, the two metal plates 1 and 2 made into a blank are butt-laid on a flat surface plate, and first butt-welded with a carbon dioxide laser as in the prior art, a semifinished product of tailored blanks made of the metal plate 1 and 2, and the butt welding planned line of the metal plate 3 to butt welding this, shearing by the shearing device, the tailored blank made of a metal plate 1 and 2 The semifinished product was butted with a metal plate 3 at an acute butt angle (θ) 4 and butt welded with a carbon dioxide laser to produce a butt weld metal plate (tailored blank material) . When 100 sheets were manufactured in this way and pressed, only one sheet caused cracks in the welded part due to poor welding due to the butt gap, and 99 good products could be collected. It was.

本発明のように溶接を実施する前に一度せん断加工を実施することによって、突合せ溶接予定線の直線度を問題無い状態にすることが出来、多少不正確なせん断形状のものでも品質上問題なく製造することが可能であった。また、本発明技術を適用した、図2に示すように4枚の金属板からなる突合せ溶接金属板(テーラードブランク材)の場合も同様の効果が得られ、金属板の数を多くしても同様な効果が得られることは上記試験から分かる。 By carrying out the shearing process once before carrying out the welding as in the present invention, the straightness of the butt welding planned line can be made into a problem-free state, and even a somewhat inaccurate shear shape has no problem in quality. It was possible to manufacture. In addition, the same effect can be obtained in the case of a butt-welded metal plate (tailored blank material) composed of four metal plates as shown in FIG. 2 to which the present invention technology is applied, and even if the number of metal plates is increased. It can be seen from the above test that similar effects can be obtained.

本発明は自動車向け等のテーラードブランク材に利用されるものであるが、特に、当該テーラードブランク材を管状に曲げ加工して溶接することにより、部分的に強度、板厚が異なった管状部材として用いることができる。   The present invention is used for tailored blank materials for automobiles and the like, and in particular, as a tubular member having partially different strength and thickness by bending the tailored blank material into a tubular shape and welding it. Can be used.

3枚の金属板を突合せ溶接してなるテーラードブランク材の例を示す図である。It is a figure which shows the example of the tailored blank material formed by butt-welding three metal plates. 4枚の金属板を突合せ溶接してなるテーラードブランク材の例を示す図である。It is a figure which shows the example of the tailored blank material formed by butt-welding four metal plates. 最初に2枚の金属板を突合せ溶接するテーラードブランク材の製造手順を示す図である。It is a figure which shows the manufacture procedure of the tailored blank material which butt-welds two metal plates first. 2枚の金属板を溶接した後のせん断加工を行うテーラードブランク材の製造手順を示す図である。It is a figure which shows the manufacturing procedure of the tailored blank material which performs the shearing process after welding two metal plates. せん断加工後に3枚目の金属板を溶接するテーラードブランク材の製造手順を示す図である。It is a figure which shows the manufacture procedure of the tailored blank material which welds the 3rd metal plate after a shearing process. 従来技術による不正確な突合せ角度の問題が生じるテーラードブランク材の製造例を示す図である。It is a figure which shows the manufacture example of the tailored blank material which the problem of the inaccurate butting angle by a prior art produces. テーラードブランク材のレーザー突合せ溶接プロセスを示す図である。It is a figure which shows the laser butt welding process of a tailored blank material.

1 金属板
2 金属板
3 金属板
4 突合せ角度(θ)
5 溶接線
6 溶接線
7 大きな突合せギャップ
8 金属板
9 せん断加工
10 鋼板
11 鋼板
12 レーザートーチ
13 溶接ビード
14 レーザービーム
15 溶接進行方向
16 溶接ゾーン
17 溶接
a1、a2、a3 突合せ溶接金属板
6a、6b 溶接線
1 Metal plate 2 Metal plate 3 Metal plate 4 Butt angle (θ)
5 Welding Line 6 Welding Line 7 Large Butt Gap 8 Metal Plate 9 Shearing 10 Steel Plate 11 Steel Plate 12 Laser Torch 13 Weld Bead 14 Laser Beam 15 Welding Direction 16 Weld Zone
17 Welding
a1, a2, a3 Butt weld metal plate
6a, 6b Welding line

Claims (3)

3枚の金属板(1、2、3)をレーザー突合せ溶接してなる、突合せ溶接金属板の製造方法において、2枚の金属板(1、2)の端面を突合せ、突合せ部をレーザー溶接して突合せ溶接金属板(a1)を作製した後、当該突合せ溶接金属板(a1)の突合せ溶接した溶接線(6)横切る切断線で当該突合せ溶接金属板(a1)の切断加工(9)を行い、引き続き切断加工した当該突合せ溶接金属板(a1)の切断加工端面を別の金属板(3)の端面に、当該突合せ溶接金属板(a1)の溶接線(6)と前記別の金属板(3)の端面との突合せ角度(θ)が鋭角となるように突合せ、突合せ部に溶接線(5)を形成するレーザー突合せ溶接(17)することを特徴とする、溶接線が鋭角の突合せ角度θを有する突合せ溶接金属板の製造方法。 Comprising three metal plates (1, 2, 3) by laser butt welding, in the manufacturing method of the butt welding metal plate, abutting the end face of the two metal plates (1, 2), the butted portion by laser welding After producing the butt weld metal plate (a1), the cutting process (9) of the butt weld metal plate (a1) is performed with a cutting line crossing the weld line (6) butt welded of the butt weld metal plate (a1). The cut end face of the butt-welded metal plate (a1), which has been performed and subsequently cut , is connected to the end face of another metal plate (3) , and the weld line (6) of the butt-welded metal plate (a1) and the other metal plate (3) Butt angle (θ) with the end face is an acute angle, and laser butt welding (17) is performed to form a weld line (5) at the butt portion. A method for manufacturing a butt-welded metal plate having an angle θ . 4枚の金属板(1、2、3、8)をレーザー突合せ溶接してなる、突合せ溶接金属板の製造方法において、2枚ずつの金属板(1、2および3、8)の端面をそれぞれ突合せ、突合せ部をレーザー溶接して2枚の突合せ溶接金属板(a2、a3)を作製した後、当該夫々の突合せ溶接金属板(a2、a3)について突合せ溶接したそれぞれの溶接線(6a、6b)を横切る切断線で当該それぞれの突合せ溶接金属板の切断加工(17)を行い、引き続き切断加工した当該それぞれの突合せ溶接金属板(a2、a3)の切断加工端面を、当該それぞれの突合せ溶接金属板(a2、a3)の各溶接線(6a、6b)と当該それぞれの突合せ溶接金属板(a2、a3)の端面との突合せ角度(θ)が鋭角となるように突合せ、突合せ部に溶接線(5)を形成する突合せレーザー溶接することを特徴とする、溶接線が鋭角の突合せ角度θを有する突合せ溶接金属板の製造方法。 In the method of manufacturing a butt-welded metal plate formed by laser butt welding four metal plates (1 , 2, 3, 8), the end surfaces of the two metal plates (1, 2, and 3, 8) each The butt welds are laser welded to produce two butt weld metal plates (a2, a3), and then the respective weld lines (6a, 6b) butt welded to the respective butt weld metal plates (a2, a3). The cutting process (17) of the respective butt-welded metal plate is performed at a cutting line crossing the butt-welded metal plate, and then the cut end faces of the respective butt-welded metal plates (a2, a3) that have been cut are used as the respective butt-welded metal sheets. Butt so that the butt angle (θ) between each weld line (6a, 6b) of plate (a2, a3) and the end face of each butt weld metal plate (a2, a3) is an acute angle, and the weld line at the butt portion (5 Characterized by butt laser welding to form a method for butt welding sheet metal welding wire has an acute butt angle theta. 前記突合せ部をレーザー溶接して作製する突合せ溶接金属板(a1、a2またはa3)は、3枚以上の金属板を並列して突合せ、突合せ部をレーザー溶接した突合せ溶接金属板であることを特徴とする請求項1または2に記載の溶接線が鋭角の突合せ角度θを有する突合せ溶接金属板の製造方法。 Wherein the butt welding metal plate abutting portion making by laser welding (a1, a2 or a3) is butt in parallel three or more metal plates are butt-welded metal plate having a laser welded butt portion method for producing a butt welding metal plate weld line has an acute butt angle θ according to claim 1 or 2,.
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