JPH0957302A - Method for joining hot steel and joining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make finish rolling continuous by cutting and joining hot steel after rough rolling on a rolling line. SOLUTION: In order to execute pressure welding of the end parts 11, 21 of the hot steels 1, 2, before pressure welding, the entire width of both end parts 11, 21 are obliquely cut so that thickness is gradually reduced toward the end part, both end parts 11, 21 are respectively cut into a staircase shape, or both end parts 11, 21 are arranged on the same plane and the butting parts of both hot steels 1, 2 are cut in parallel under a reducing atmosphere 51, and both cut slopes or both staircase-shaped surfaces 12, 22 are overlapped, or the butting parts are butted against each other and, by executing pressure welding under the reducing atmosphere 51, the hot steels 1, 2 are joined. Further, before pressure welding, the rear end part 11 of a preceding material 1 and the tip part 21 of the succeeding material 2 are overlapped, the overlapped part is cut with a rotary saw blade under the reducing atmosphere 51, the cut faces are butted against each other under the reducing atmosphere 51 and, by executing pressure welding, the hot steels are joined.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】この発明は、鋼材の連続熱間
圧延ライン等において、熱間鋼材（たとえば900℃以上
というような熱いままの鋼材）を効率よく、しかも確実
に接合する方法、および接合装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently and reliably joining hot steel materials (steel materials that remain hot, such as 900 ° C. or higher) in a continuous hot rolling line for steel materials, and the like. Regarding the device.

【０００２】[0002]

【従来の技術】製鉄工場では、省エネルギー、製品歩留
りの向上、生産性の向上等を目的として、製造工程の連
続化が精力的に進められている。その中でも、熱延鋼板
（ホットコイル）を製造する熱間圧延工程の連続化は重
要な課題の一つとなっている。2. Description of the Related Art In an ironworks, continuous production processes are being vigorously promoted for the purpose of energy saving, improvement of product yield, improvement of productivity, and the like. Among them, continuation of the hot rolling process for producing a hot-rolled steel sheet (hot coil) is one of the important issues.

【０００３】従来の熱間圧延においては、加熱後のスラ
ブを１枚ずつ粗圧延機と仕上圧延機に供給して間欠的に
圧延を行っていた。このような間欠圧延は、それ自体が
非能率的なだけでなく、特に被圧延材の板厚が薄い場合
には、その先端が変形してガイドロールに突っ掛けた
り、後端が圧延機を抜けるときに絞り込まれて圧延ロー
ルを損傷することが多い。これらのトラブルが発生する
と、圧延ラインを停止して補修やロール交換を行うこと
を余儀なくされる。このようなトラブルを防止するには
圧延速度を遅くしなければならず、圧延の能率は一層低
下する。In the conventional hot rolling, the heated slabs are supplied one by one to a rough rolling machine and a finishing rolling machine to perform rolling intermittently. Such intermittent rolling is not only inefficient in itself, but also when the material to be rolled has a small thickness, its tip deforms and hits a guide roll, or its trailing end is a rolling mill. It is often squeezed when it comes off and damages the roll. When these troubles occur, it is inevitable to stop the rolling line and perform repairs or roll replacement. To prevent such troubles, the rolling speed must be reduced, and the rolling efficiency is further reduced.

【０００４】また、熱延鋼板の先端および後端では、そ
の中央部に比べて圧延速度のバランスが崩れ、適正な圧
延温度範囲から外れるので、寸法外れが発生し易い。更
に、熱延鋼板の先端では、板幅方向の中央部が圧延方向
に突き出して板幅が狭くなり、後端では逆に板幅中央部
が窪むフィッシュテイルという現象が起きる。その外、
先端が圧延ロールに噛み込む時やダウンコイラーによる
巻取り開始時に、急激な張力の上昇があり板幅が狭くな
るという問題もある。このように仕上圧延後の鋼板の先
端および後端は、製品として寸法不良になるから、その
部分は切り捨てなければならず、生産歩留りの低下が大
きい。Further, at the front and rear ends of the hot-rolled steel sheet, the rolling speed is out of balance as compared with the central portion, and the rolling temperature is out of the proper rolling temperature range. Further, at the leading end of the hot-rolled steel sheet, a central portion in the plate width direction protrudes in the rolling direction to reduce the plate width, and at the rear end, a fishtail phenomenon occurs in which the central portion of the plate width is depressed. Besides that,
There is also a problem that the width of the strip becomes narrow due to a sharp increase in tension when the tip bites into the rolling roll or at the start of winding by the down coiler. As described above, the leading end and the trailing end of the steel sheet after the finish rolling have dimensional defects as a product, so that the part must be cut off, and the production yield is greatly reduced.

【０００５】上記のような問題を解消するために、近
年、粗圧延機と仕上圧延機の間で、先行する粗圧延済み
の鋼材（以下、先行鋼板という）と、後続する粗圧延済
みの鋼材（以下、後行鋼板という）とを接合し、仕上圧
延を連続的に行う方法が提案されている。この場合の接
合は、スケールを除去 (脱スケール) した鋼板の端部を
突き合わせ、または重ね合わせて圧接することによって
行うのが最も実際的である。In order to solve the above problems, in recent years, a preceding rough-rolled steel material (hereinafter referred to as a preceding steel plate) and a subsequent rough-rolled steel material are provided between a rough rolling mill and a finish rolling mill. A method has been proposed in which (hereinafter, referred to as a trailing steel plate) is joined and finish rolling is continuously performed. In this case, joining is most practically performed by abutting the ends of the steel plates from which scale has been removed (descaled) or by overlapping and pressing them.

【０００６】本出願人は、熱延鋼板の重ね合わせ部また
は突き合わせ部を還元雰囲気の下で加熱し、およびスケ
ールを還元し、熱延鋼板の幅方向に圧接する方法を特開
平５−8058号公報で提案した。還元雰囲気の下で加熱す
れば、積極的にスケールを除去しなくとも圧接できるの
で、熱延鋼板の接合を簡単に能率よく行うことができる
のである。The applicant of the present invention discloses a method of heating the lapped portion or butt portion of the hot-rolled steel sheet in a reducing atmosphere, reducing the scale, and press-contacting the hot-rolled steel sheet in the width direction thereof. Proposed in the bulletin. By heating in a reducing atmosphere, pressure welding can be performed without positively removing the scale, so that the hot-rolled steel sheets can be joined easily and efficiently.

【０００７】しかし、還元雰囲気の下での加熱だけで還
元できるスケールの厚さには限界があり、数10μｍ以上
の厚いスケールが生成している鋼板、あるいは還元され
にくい組成のスケールが生成している鋼板の場合には、
圧接の前に積極的に脱スケールすることが必要となる。
本出願人の一人は、この脱スケールを行う方法について
も次に示すような提案を行った。However, there is a limit to the thickness of the scale that can be reduced only by heating in a reducing atmosphere, and a steel plate on which a thick scale of several tens of μm or more is formed or a scale having a composition that is difficult to reduce is formed. In the case of
Aggressive descaling is required before welding.
One of the applicants also proposed the following method for performing the descaling.

【０００８】1) 熱間鋼材の接合面のスケールをホット
スカーフィングによって除去し、直ちに圧接する方法
（特開平5-50111 号公報参照）。1) A method in which the scale on the joint surface of a hot steel material is removed by hot scarfing and pressure welding is immediately performed (see Japanese Patent Laid-Open No. 5-50111).

【０００９】2) 先行鋼材の後端部と後行鋼材の先端部
をそれぞれ上下一対の金型で挟み、両材の接合面同士を
すり合わせてスケールを除去した後、金型を電極として
通電加熱し、圧接する方法（特開平5-245507号公報参
照）。2) The rear end portion of the preceding steel material and the front end portion of the following steel material are sandwiched by a pair of upper and lower molds, and the joining surfaces of both materials are rubbed together to remove the scale, and then the mold is used as an electrode for electric heating. And pressure contact (see Japanese Patent Laid-Open No. 5-245507).

【００１０】3) 熱間鋼材の突き合わせ部をホットスカ
ーファーで脱スケールした後、突き合わせ面を含まない
突き合わせ両端部の板幅を、厚さ方向に圧下して接合す
る方法（特開平6-7805号公報参照）。3) A method of descaling the abutting portion of the hot steel material with a hot scarf, and then joining by pressing down the plate widths of the abutting end portions not including the abutting surface in the thickness direction (JP-A-6-7805). (See Japanese Patent Publication).

【００１１】4) 熱間鋼材表面のスケールをホットスカ
ーファーで除去し、還元炎でシールドしながら圧接する
方法（特開平6-114575号公報参照）。4) A method in which the scale on the surface of the hot steel material is removed by a hot scarf and pressure welding is performed while shielding with a reducing flame (see Japanese Patent Laid-Open No. 6-114575).

【００１２】5) 熱間鋼材同士を突き合わせた後、先行
材と後行材を押しつけながら、その突き合わせ部に酸素
を吹き付けて溶削しつつ（非酸化性雰囲気で）圧接する
方法(特開平6-155046号公報参照）。5) A method in which hot steel materials are butted against each other, and then the preceding material and the following material are pressed against each other, and oxygen is blown to the butted portions to melt and ablate them (in a non-oxidizing atmosphere). -155046).

【００１３】6) ブラシロールとそのブラシロールを使
用して熱間鋼材を脱スケールした後、熱間圧接する方法
（特開平6-200388号公報参照）。6) A brush roll and a method of descaling a hot steel material using the brush roll, followed by hot pressure welding (see JP-A-6-200388).

【００１４】7) 熱間鋼材の接合部を還元雰囲気の下で
脱スケールした後、その接合部を重ね合わせて圧接する
方法（特開平6-312277号公報参照）。7) A method of descaling the joint portion of the hot steel material in a reducing atmosphere, and then superimposing the joint portion and pressure welding (see Japanese Patent Laid-Open No. 6-312277).

【００１５】8) 粗圧延後の熱間鋼材を圧延ライン中
で、回転切削工具によって機械的に脱スケールして圧接
する方法（特開平6-335785号公報参照）。8) A method of mechanically descaling and pressure-welding a hot-rolled steel material after rough rolling in a rolling line with a rotary cutting tool (see JP-A-6-335785).

【００１６】[0016]

【発明が解決しようとする課題】熱間圧延ラインの粗圧
延機から仕上圧延機までの間にある鋼材は、およそ 900
〜1150℃の高温である。従って、この間で脱スケールを
行っても、接合までに時間がかかれば再びスケールが生
成してしまう。還元雰囲気の下でホットスカーファーや
ブラシロールを用いて脱スケールする方法も提案されて
いる。しかし、ホットスカーファーでは再酸化し、ブラ
シロールは脱スケールが十分でなく、接合強度を低下さ
せることになる。また、回転切削工具による脱スケール
の方法は、工具を高速度鋼製にしても耐熱性が不十分
で、先端が摩耗し、実用的でない。The steel material between the rough rolling mill and the finishing mill in the hot rolling line is approximately 900.
High temperature of ~ 1150 ° C. Therefore, even if descaling is performed during this period, scale will be generated again if it takes time before joining. A method of descaling using a hot scarfer or a brush roll in a reducing atmosphere has also been proposed. However, it reoxidizes in the hot scarf, and the descaling of the brush roll is not sufficient, resulting in a decrease in bonding strength. Further, the descaling method using a rotary cutting tool is not practical even if the tool is made of high-speed steel because the heat resistance is insufficient and the tip is worn.

【００１７】本発明の目的は、高温の鋼材の接合すべき
面を、還元雰囲気の下で切削加工または切断加工を行
い、還元雰囲気の下で圧接して、健全な接合部を得る方
法を提供することにある。An object of the present invention is to provide a method for obtaining a sound joint by performing a cutting process or a cutting process on a surface of a high temperature steel material to be joined under a reducing atmosphere and pressing the surface under pressure under a reducing atmosphere. To do.

【００１８】[0018]

【課題を解決するための手段】本発明は、図１に示す下
記〜の熱間鋼材の接合方法と、図２から図８までに
示す下記〜の熱間鋼材の接合装置を要旨とする。The gist of the present invention is the following joining method for hot steel materials shown in FIG. 1 and the joining apparatus for hot steel materials shown below in FIGS. 2 to 8.

【００１９】熱間鋼材の端部を圧接する方法であっ
て、圧接に先立ち先行材(1、先行鋼板)の後端部(11)と
後行材(2、後行鋼板) の先端部(21)を還元雰囲気(51)の
下で切削または切断し、還元雰囲気の下で切削面または
切断面(12,22) を重ね合わせた後、または突き合わせた
後、還元雰囲気の下で圧接する熱間鋼材の接合方法。A method of pressure welding the ends of a hot steel material, wherein the front end portion (11) of the preceding material (1, leading steel plate) and the leading end portion (2, trailing steel plate) of the preceding material (1) 21) is cut or cut under reducing atmosphere (51), and the cutting or cutting surfaces (12,22) are superposed or butted together under reducing atmosphere, and then heat is applied under pressure in reducing atmosphere. Method of joining steel materials.

【００２０】両鋼材の端部を重ね合わせて圧接する方
法であって、両端部の全幅を厚さが端部に向かって漸減
する斜め切削を行い、切削された両傾斜面(12,22) を重
ね合わせて還元雰囲気の下で圧接する熱間鋼材の接合方
法（図１(a) 参照）。A method in which the ends of both steel materials are overlapped and pressure-welded, and oblique cutting is performed in which the entire width of both ends gradually decreases toward the ends, and both inclined surfaces (12, 22) are cut. A method for joining hot steel materials in which they are superposed and pressed together in a reducing atmosphere (see Fig. 1 (a)).

【００２１】上記の切削加工は、両端部をそれぞれ階段
状に還元雰囲気の下で切削する加工でもよい。この場合
は還元雰囲気の下で階段状に切削された切削面(12,22)
を重ね合わせて圧接する（図１(b) 参照）。The above-mentioned cutting process may be a process in which both ends are cut stepwise in a reducing atmosphere. In this case, the cutting surface (12,22) cut in steps under the reducing atmosphere
And press-connect them (see Fig. 1 (b)).

【００２２】両鋼材の端部を突き合わせて圧接する方
法であって、両端部を同一平面内に配置し、還元雰囲気
の下で両材料の端部（突き合わせ部）を平行に切削し、
還元雰囲気の下で両切削面(12,22) を突き合わせて圧接
する熱間鋼材の接合方法（図１(d) 参照）。A method in which the ends of both steel materials are butted against each other and pressure-welded, both ends are arranged in the same plane, and the ends (butted parts) of both materials are cut in parallel under a reducing atmosphere,
A joining method for hot steel materials in which both cutting surfaces (12, 22) are butted against each other and pressed together in a reducing atmosphere (see Fig. 1 (d)).

【００２３】上記の切削加工は、両端部を重ね合わせ、
重ね合わせ部を回転鋸歯で還元雰囲気の下で同時に切断
する加工であってもよい（図８参照）。In the above cutting process, both ends are overlapped,
Alternatively, the overlapping portions may be cut simultaneously with a rotating saw tooth under a reducing atmosphere (see FIG. 8).

【００２４】熱間鋼材の端部を重ね合わせて圧接する
装置であって、先行材(1) の後端部(11)と後行材(2) の
先端部(21)とをそれぞれ把持する把持装置(3,3')と、前
記把持装置で上下段違い状に平行に置かれた先行材の後
端部と後行材の先端部との間に配設された回転切削装置
(61,61')と、それぞれの熱間鋼材先端部の片面を厚さが
端部に向かって漸減する方向に斜めに切削する前記回転
切削装置を移動させる装置(8) と、前記斜め切削された
面(12,22) を重ね合わせ押圧する装置(4,4')と、熱間鋼
材の切削部(12,22) および押圧部を還元雰囲気に保つ装
置、たとえば還元性ガスなどを吹き付ける装置(5) とか
らなる熱間鋼材の接合装置（図２、図３および図４参
照）。A device for superimposing the end portions of hot steel materials and press-contacting each other, and grips the rear end portion (11) of the preceding material (1) and the front end portion (21) of the following material (2), respectively. A gripping device (3, 3 ') and a rotary cutting device disposed between the trailing end of the preceding material and the leading end of the trailing material placed in parallel in the gripping device in a step-up and down manner.
(61, 61 '), a device (8) for moving the rotary cutting device that obliquely cuts one surface of each hot steel tip in a direction in which the thickness gradually decreases toward the end, and the oblique cutting A device (4, 4 ') for overlapping and pressing the formed surfaces (12, 22) and a device for keeping the cutting part (12, 22) and pressing part of the hot steel material in a reducing atmosphere, for example, spraying a reducing gas An apparatus (5) for joining hot steel materials (see FIGS. 2, 3 and 4).

【００２５】熱間鋼材の端部を重ね合わせて圧接する
装置であって、先行材の後端部と後行材の先端部とをそ
れぞれ把持する把持装置と、前記把持装置で上下段違い
状に平行に置かれた先行材の後端部と後行材の先端部と
の間に配設され、先行材後端部と後行材先端部をそれぞ
れ階段状に切削する装置(62,61) と、階段状に切削する
装置を熱間鋼材の幅方向に移動させる装置(7) と、階段
状に切削された端部を重ね合わせて押圧する装置と、熱
間鋼材の切削部および押圧部を還元雰囲気に保つ装置と
からなる熱間鋼材の接合装置（図５および図６参照）。A device for superposing the end portions of hot steel materials and press-contacting each other, and a gripping device for gripping the trailing end portion of the preceding material and the leading end portion of the trailing material, respectively, and the gripping device in a stepped manner. A device that is placed between the trailing edge of the preceding material and the leading edge of the following material placed in parallel, and cuts the trailing edge of the preceding material and the leading edge of the following material in steps (62,61). And a device for moving a device for cutting in steps in the width direction of the hot steel material (7), a device for overlapping and pressing the ends cut in steps, and a cutting part and a pressing part for the hot steel product. And a device for maintaining a reducing atmosphere in a hot steel joining device (see FIGS. 5 and 6).

【００２６】熱間鋼材の端部を突き合わせて圧接する
装置であって、熱間鋼材の先行材の後端部と後行材の先
端部を同一平面内に把持する把持装置と、熱間鋼材の先
行材後端部と後行材先端部との間に挿入し、両材料を同
一平面内で平行に切削する切削装置(61)と、前記切削装
置を熱間鋼材の厚さ方向または幅方向に移動させる装置
と、切削された端面を突き合わせ押圧する装置と、熱間
鋼材の切削部および押圧部を還元雰囲気に保つ装置とか
らなる熱間鋼材の接合装置（図７参照）。A device for abutting and pressing the ends of the hot-working steel material into pressure contact with each other, and a device for gripping the trailing end of the preceding material of the hot-working steel and the tip of the following material in the same plane, and a hot-working steel material. Inserting between the trailing edge of the preceding material and the leading edge of the trailing material, a cutting device (61) for cutting both materials in parallel in the same plane, and the cutting device in the thickness direction or width of the hot steel material. A joining device for hot steel materials comprising a device for moving in the direction, a device for butting and pressing a cut end surface, and a device for maintaining a cutting portion and a pressing portion of the hot steel material in a reducing atmosphere (see FIG. 7).

【００２７】熱間鋼材の端部を突き合わせて圧接する
装置であって、熱間鋼材の先行材の後端部と後行材の先
端部とをそれぞれ把持し重ね合わせて把持する装置と、
重ね合わせ部を幅方向に進行する回転鋸歯装置(63)と、
回転鋸歯装置を熱間鋼材の幅方向に移動させる装置(7)
と、鋸断された端面を突き合わせ押圧する装置と、熱間
鋼材の下面の鋸断部および押圧部を還元雰囲気に保つ装
置とからなる熱間鋼材の接合装置（図８参照）。A device for abutting and pressing the ends of the hot-working steel material, wherein the trailing end part of the preceding material and the leading end part of the following material of the hot-working steel product are respectively gripped and overlapped with each other,
A rotating sawtooth device (63) that advances the overlapping portion in the width direction,
Device for moving the rotating saw blade device in the width direction of hot steel (7)
And a device for pressing the sawed end faces against each other and a device for maintaining a sawing part and a pressing part on the lower surface of the hot steel product in a reducing atmosphere (see FIG. 8).

【００２８】上記の本発明方法で行う「切削または切
断」というのは、剪断加工でなく回転切削工具などを用
いた切削加工である。例えば、回転切削工具は、図2(b)
および図3(b)に示すような円筒状または円板状の回転体
の表面に、刃（バイト）が配設されているものであり、
タングステンカーバイドなどの超硬合金、セラミックス
などの使い捨て工具（スローアウェイチップ）を組み込
んだものが望ましい。The "cutting or cutting" carried out by the method of the present invention is not a shearing process but a cutting process using a rotary cutting tool or the like. For example, the rotary cutting tool is shown in Fig. 2 (b).
And a blade (bite) is arranged on the surface of a cylindrical or disk-shaped rotating body as shown in FIG. 3 (b),
Cemented carbide such as tungsten carbide and disposable tools (throwaway tips) such as ceramics are preferable.

【００２９】この発明に用いる切削工具は、高温の鋼板
を切削し、直火還元炎による高温にさらされる場合もあ
るので、耐熱性に優れた材料を用いるのが好ましく、超
硬合金やセラミックスなどが用いられる。従来鋼材の切
削に広く使用されている高速度鋼では、高温の鋼材に接
触する刃先が直ぐに損耗してしまう。The cutting tool used in the present invention may cut a high-temperature steel plate and may be exposed to a high temperature due to a direct flame reducing flame. Therefore, it is preferable to use a material excellent in heat resistance, such as cemented carbide or ceramics. Is used. In high-speed steel that has been widely used for cutting conventional steel materials, the cutting edge that comes into contact with high-temperature steel materials is immediately worn away.

【００３０】スローアウェイチップは、バイトホルダー
に機械的に取り付けられている。従って、刃先まで所定
の高さを有しているので、切削中に吹き付ける還元雰囲
気の流れをよくするとともに、刃先の交換が容易で作業
の効率向上とコスト削減の効果が得られる。The throw-away tip is mechanically attached to the bite holder. Therefore, since the cutting edge has a predetermined height, the flow of the reducing atmosphere to be blown during cutting is improved, and the cutting edge can be easily replaced, thereby improving the work efficiency and reducing the cost.

【００３１】この発明の装置に用いる鋼板の把持装置の
把持部および押圧装置の押圧治具は、高温の鋼板と接触
するので耐熱性に優れた材料を用いる。耐熱性に優れた
材料には、Si₃N₄ 、Al₂O₃ などのセラミックスが用いら
れる。The grip portion of the steel plate gripping device and the pressing jig of the pressing device used in the apparatus of the present invention are made of a material having excellent heat resistance because they come into contact with a high temperature steel plate. Ceramics such as Si ₃ N ₄ and Al ₂ O ₃ are used as materials having excellent heat resistance.

【００３２】[0032]

【発明の実施の形態】図１は、本発明方法の接合の態様
を示す図であり、(a) 〜(c) は鋼板を重ね合わせてその
厚さ方向に押圧して接合する状態を示す図、(d) は鋼板
を突き合わせてその長手方向に押圧して接合する状態を
示す図である。１は先行鋼板、11は先行鋼板の後端部、
２は後行鋼板、21は後行鋼板の先端部、３は先行鋼板を
把持する把持装置、3'は後行鋼板を把持する把持装置、
４は接合のための押圧力を加える下押圧装置、4'は４と
同作用をもつ上押圧装置、５は還元雰囲気ガス51などを
吹き付ける吹き付け装置である。また、５は還元炎を発
生させるバーナーであってもよい。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing a mode of joining in the method of the present invention, and (a) to (c) show a state in which steel sheets are superposed and pressed in the thickness direction to join them. FIG. 3D is a diagram showing a state where steel plates are butted and pressed in the longitudinal direction to be joined. 1 is the leading steel plate, 11 is the trailing edge of the leading steel plate,
2 is a trailing steel plate, 21 is a tip portion of the trailing steel plate, 3 is a gripping device that grips the leading steel plate, 3'is a gripping device that grips the trailing steel plate,
Reference numeral 4 is a lower pressing device for applying a pressing force for joining, 4'is an upper pressing device having the same function as 4, and 5 is a spraying device for spraying the reducing atmosphere gas 51 and the like. Further, 5 may be a burner that generates a reducing flame.

【００３３】接合は、鋼板の接合部の形状によって重ね
合わせて行う方法と、突き合わせて行う方法とがある。There are two methods of joining, one is by superimposing and the other is by butting, depending on the shape of the joining portion of the steel plates.

【００３４】重ね合わせて行う方法は、図１(a) に示す
ように接合部を斜めに切削したもの、同図(b) のように
階段状に切削したもの、同図(c) のように溝状の切欠を
つけたものなどがある。いずれも把持装置３、3'で鋼板
1,2 を把持し、切削面12,22を重ね合わせ、いずれかの
押圧装置（例えば上押圧装置4'）で鋼板の厚さ方向に圧
下する。圧下と同時に、いずれかの把持装置（この場合
には後行鋼板把持装置3'）を圧下量に応じて移動させる
か、または把持装置を開放する。なお、接合の際には、
吹き付け装置５から還元雰囲気ガス51などを吹き付け、
酸化を防止する。ここで還元雰囲気ガスを吹き付けるの
は、切削面をそのまま放置すると１秒間に約10μｍのス
ケールが発生するので、これを防止し高い接合強度を得
るためである。The overlapping method is as shown in FIG. 1 (a), where the joint is cut diagonally, as shown in FIG. 1 (b) in a stepwise manner, and as shown in FIG. 1 (c). There is something with a groove-shaped cutout. Both are gripping devices 3 and 3 '
1, 2 are gripped, the cutting surfaces 12, 22 are overlapped, and any pressing device (for example, upper pressing device 4 ′) is pressed down in the thickness direction of the steel plate. Simultaneously with the rolling reduction, one of the gripping devices (in this case, the trailing steel plate gripping device 3 ′) is moved according to the amount of rolling reduction, or the gripping device is opened. In addition, at the time of joining,
A reducing atmosphere gas 51 or the like is sprayed from the spraying device 5,
Prevents oxidation. The reducing atmosphere gas is blown here to prevent generation of a scale of about 10 μm per second when the cutting surface is left as it is, and to obtain high bonding strength.

【００３５】突き合わせて行う方法は、図１(d) に示す
ように切削または切断後、鋼板を把持装置で把持し、切
削部または切断面12,22 を同一平面に突き合わせ、さら
に把持装置を鋼板の長手方向に移動し、押圧して接合す
る。また、接合の際には、吹き付け装置５から還元雰囲
気ガス51などを吹き付け、酸化を防止する。As shown in FIG. 1 (d), the method of butting is performed by holding the steel plate with a gripping device after cutting or cutting, butting the cutting portions or cutting surfaces 12 and 22 in the same plane, and further holding the gripping device with the steel plate. Move in the longitudinal direction and press to join. At the time of joining, reducing atmosphere gas 51 or the like is blown from the blowing device 5 to prevent oxidation.

【００３６】Ｉ．鋼板を重ね合わせて接合する場合： Ａ．接合部を斜めに切削する方法；図２は、圧接に先立
って行う接合部の切削状態を示す図であり、(a) は正面
図、(b) は回転切削装置の平面図である。61は回転切削
装置、611 は回転切削装置の回転刃として配置された刃
（バイト）、４は切削の背力を支えるとともに接合のた
めの押圧力を加える下押圧装置、4'は４と同作用をもつ
上押圧装置である。I. When steel sheets are overlapped and joined: A. Method of cutting joint part at an angle; FIG. 2 is a diagram showing a cutting state of the joint part prior to pressure welding, (a) is a front view, and (b) is a plan view of a rotary cutting device. 61 is a rotary cutting device, 611 is a blade (bite) arranged as a rotary blade of the rotary cutting device, 4 is a lower pressing device for supporting a back force of cutting and applying a pressing force for joining, and 4'is the same as 4. It is an upper pressing device having an action.

【００３７】回転切削装置61は、強靱鋼などで製作され
た円筒状のバイト取付け治具612 の円周面に、超硬合金
またはセラミックスなどの使い捨て工具（スローアウェ
イチップ）を取り付けたバイト611 を組み込んだもので
ある。The rotary cutting device 61 includes a tool 611 in which a disposable tool (throwaway tip) such as a cemented carbide or ceramics is mounted on the circumferential surface of a cylindrical tool mounting jig 612 made of tough steel. It is built in.

【００３８】図２に示す装置を使用して、次のように本
発明の切削方法が実施される。The cutting method of the present invention is carried out as follows using the apparatus shown in FIG.

【００３９】まず、先行鋼板１の後端部11が下押圧装置
４の位置に送られたとき、先行鋼板把持装置３で先行鋼
板を把持する。一方、後行鋼板２の先端部21を後行鋼板
把持装置3'で把持し、図１(a) に示すように先行鋼板と
接合すべき長さだけ、所定の間隔をもって上下段違い状
に平行となるように、後行鋼板を移動させる。所定の間
隔とは、回転切削装置61に設けられた刃611 の刃先が描
く軌跡の直径から最大切削深さｄを差し引いた値に相当
し、最終的には上押圧装置4'を押し下げて調節する。First, when the rear end portion 11 of the preceding steel plate 1 is sent to the position of the lower pressing device 4, the preceding steel plate gripping device 3 grips the preceding steel plate. On the other hand, the leading end 21 of the trailing steel plate 2 is gripped by the trailing steel plate gripping device 3 ', and as shown in FIG. The trailing steel plate is moved so that The predetermined interval corresponds to a value obtained by subtracting the maximum cutting depth d from the diameter of the locus drawn by the cutting edge of the blade 611 provided on the rotary cutting device 61, and is finally adjusted by pushing down the upper pressing device 4 ′. To do.

【００４０】両鋼板が所定の間隔に配置されると、回転
切削装置61の回転軸が一点鎖線で示す軌跡に沿って移動
させられ、傾斜をもった軌跡部（切削の系内）で、両鋼
板の端部11,21 の片面を厚さが端部に向かって漸減する
方向に斜めに切削する。切削中は、吹き付け装置５から
還元雰囲気ガスなどを吹き付け、切削面が酸化されない
ようにする。また、同図に示すように両鋼板を同時に切
削してもよく、別々に切削してもよい。切削した後には
回転切削装置は、切削の系外に離れる。なお、切削の系
に入るとき、および離れるときに両鋼板の先端端部を切
削するのが好ましい。When both steel plates are arranged at a predetermined interval, the rotary shaft of the rotary cutting device 61 is moved along the locus indicated by the alternate long and short dash line, and the locus part having an inclination (within the cutting system) One side of the edges 11, 21 of the steel sheet is cut diagonally in the direction in which the thickness gradually decreases toward the edges. During cutting, a reducing atmosphere gas or the like is blown from the blowing device 5 to prevent the cutting surface from being oxidized. Further, both steel plates may be cut at the same time as shown in the figure, or may be cut separately. After cutting, the rotary cutting device leaves the cutting system. In addition, it is preferable to cut the tip ends of both steel plates when entering and leaving the cutting system.

【００４１】回転切削装置は、図2(b)に示すように、鋼
板の幅よりも長い円筒状のバイト取付け治具612 の円周
上に、バイト611 を千鳥状または螺旋状に組み込まれ、
回転することによって鋼板の全幅を切削することができ
る。バイト611 は、超硬合金やセラミックス製のスロー
アウェイチップをバイトホルダーに機械的に取り付けた
ものであり、公知のものが使用できる。バイト取付け治
具612 は、上記バイトホルダーを千鳥状または螺旋状に
固定するもので、回転・移動装置によって回転・移動で
きるようになっている。In the rotary cutting device, as shown in FIG. 2 (b), the cutting tools 611 are assembled in a zigzag or spiral shape on the circumference of a cylindrical cutting tool fixture 612 longer than the width of the steel plate.
By rotating, the entire width of the steel plate can be cut. The cutting tool 611 is one in which a throw-away tip made of cemented carbide or ceramics is mechanically attached to a cutting tool holder, and a known tool can be used. The tool attaching jig 612 fixes the above-mentioned tool holder in a zigzag or spiral shape, and can be rotated / moved by a rotating / moving device.

【００４２】両鋼板の切削が終わると、例えば図1(a)に
示すように、後行鋼板把持装置3'と上押圧装置4'によっ
て後行鋼板を下に移動し、上下の押圧装置４、4'で押圧
して、圧接する。なお、押圧する際には、前記吹き付け
装置５から還元雰囲気ガスなどを吹き付けながら行い、
切削から圧接が完了するまで還元雰囲気ガスなどの中で
行って、酸化を防止する。When the cutting of both steel plates is completed, as shown in FIG. 1 (a), for example, the trailing steel plate gripping device 3'and the upper pressing device 4'move the trailing steel plate downward to move the upper and lower pressing devices 4 '. , 4 ', and press contact. In addition, when pressing, it is performed while spraying a reducing atmosphere gas from the spraying device 5,
It is performed in a reducing atmosphere gas or the like from cutting to completion of pressure welding to prevent oxidation.

【００４３】図３は、円板状回転切削装置を使用した場
合の切削状態を示す図であり、(a)は正面図、(b) は円
板状回転切削装置の平面図である。円板状回転切削装置
61'は、円板状バイト取付け治具612'の両表面に、バイ
ト611 を組み込んだものである。図のように回転軸が所
定の角度（斜め切断の傾斜角）をもった円板状回転切削
装置61' を、回転させながら鋼板の幅方向に送ることに
よって、鋼板の端部を斜めに切削することができる。3A and 3B are views showing a cutting state when the disc-shaped rotary cutting device is used. FIG. 3A is a front view and FIG. 3B is a plan view of the disc-shaped rotary cutting device. Disc-shaped rotary cutting device
61 'is a tool in which a cutting tool 612 is incorporated on both surfaces of a disk-shaped tool mounting jig 612'. As shown in the figure, the end of the steel plate is cut diagonally by feeding the disk-shaped rotary cutting device 61 'with the rotation axis at a predetermined angle (diagonal angle of oblique cutting) in the width direction of the steel plate while rotating it. can do.

【００４４】斜め切削する前の鋼板の端面は、剪断機で
切断され、その切断部は鋼板の上面が剪断刃で押し込ま
れて傾斜部（ダレ）が発生する。斜め切削は、この傾斜
部に沿って行うことができ、これによって切削動力を小
さく、また装置も簡単なものにできるという利点があ
る。The end surface of the steel sheet before being diagonally cut is cut by a shearing machine, and at the cut portion, the upper surface of the steel sheet is pushed by a shearing blade to generate an inclined portion (sag). Oblique cutting can be performed along this inclined portion, which has the advantage that the cutting power can be reduced and the device can be simplified.

【００４５】図４は、回転切削装置の移動装置を示す図
である。回転切削装置61は、移動アーム81によって支持
され、伝導装置を介して電動機（図示せず）で回転する
構造となっている。移動アームは、移動用圧力装置82に
よって角移動し、回転切削装置を円弧状に移動する。移
動台83は、移動アームを支持し、傾斜面84に沿って油圧
などの圧力装置によって摺動する。FIG. 4 is a diagram showing a moving device of the rotary cutting device. The rotary cutting device 61 is supported by a moving arm 81 and has a structure in which it is rotated by an electric motor (not shown) via a transmission device. The moving arm is angularly moved by the moving pressure device 82 to move the rotary cutting device in an arc shape. The moving table 83 supports the moving arm and slides along the inclined surface 84 by a pressure device such as hydraulic pressure.

【００４６】先行鋼板1 が押圧装置4 の上にセットされ
ると、移動アーム81が角移動され、続いて傾斜面84に沿
って切削開始点まで移動される。次に後行鋼板2 を所定
の位置にセットし、回転切削装置を回転させながら、傾
斜面84に沿って引上げ、両鋼材の端部を斜めに切削す
る。When the preceding steel plate 1 is set on the pressing device 4, the moving arm 81 is angularly moved, and then is moved along the inclined surface 84 to the cutting start point. Next, the trailing steel plate 2 is set at a predetermined position, and while the rotary cutting device is being rotated, it is pulled up along the inclined surface 84 and the end portions of both steel materials are cut obliquely.

【００４７】Ｂ．接合部を階段状に切削する場合；図５
は、接合部を階段状に切削する状態を示す図であり、
(a) は切削の状態を示す正面図、(b) は階段状に切削す
る切削装置の平面図、(c) は同切削装置の断面図であ
る。62は二枚の鋼板の先端部を同時に階段状に切削する
階段状切削装置、621 は階段状切削装置に組み込まれた
平削りバイト、624 はバイト取付け治具、７は階段状切
削装置を送り方向に移動する移動装置、71は移動装置の
ネジ棒、72は移動装置の案内棒である。階段状に切削す
る切削装置62は、同図(b) 、(c)に示すようにバイト取
付け治具624 の基準面625,626 からの高さが切削の時期
が遅くなる方向に漸増する平削りバイト621 を、例えば
千鳥状に配置して構成する。B. When cutting the joint in steps: Fig. 5
Is a diagram showing a state of cutting the joint portion in a stepwise manner,
(a) is a front view showing a cutting state, (b) is a plan view of a cutting device for cutting in steps, and (c) is a sectional view of the cutting device. 62 is a step cutting device that simultaneously cuts the tips of two steel plates into a step, 621 is a planing tool incorporated in the step cutting device, 624 is a tool for attaching a bit, and 7 is a step cutting device. The moving device moves in the direction, 71 is a screw rod of the moving device, and 72 is a guide rod of the moving device. As shown in (b) and (c) of the figure, the cutting device 62 that cuts in a stepwise manner is a planing tool in which the height from the reference surface 625,626 of the tool mounting jig 624 gradually increases in the direction in which the timing of cutting is delayed. 621 are arranged in a staggered pattern, for example.

【００４８】切削は、図5(a)に示すように階段状に切削
する切削装置62を、鋼板１、２の幅方向（紙面の垂直方
向）に移動させ、端部の切削部12,13,22,23 を同時に平
面削り的に切削する。幅方向の移動は、公知の手段、例
えば案内棒72（または案内板）などを摺動させながら、
回転するネジ棒71または油圧装置（図示せず）で行うこ
とができる。切削に際し、鋼板の把持方法、押圧装置お
よび還元雰囲気ガスなどの吹き付け装置の使用方法は、
図２で説明した場合と同様である。For cutting, as shown in FIG. 5 (a), a cutting device 62 for cutting in steps is moved in the width direction of the steel plates 1 and 2 (perpendicular to the paper surface), and the cutting parts 12 and 13 at the ends are moved. Cut 22,22,23 at the same time by planing. The movement in the width direction is performed by sliding a known means, for example, a guide rod 72 (or a guide plate),
This can be done with a rotating threaded rod 71 or a hydraulic device (not shown). At the time of cutting, the method of holding the steel plate, the method of using the pressing device and the device for spraying reducing atmosphere gas,
This is similar to the case described in FIG.

【００４９】階段状に切削した場合の接合方法は、図１
(b) に示すように図１(a) と同様な手順で行う場合と、
板厚方向の押圧と鋼板を把持した装置で長手方向の押圧
を併用して圧接することもできる。The joining method in the case of cutting stepwise is shown in FIG.
As shown in (b), the same procedure as in Fig. 1 (a)
The pressing in the plate thickness direction and the pressing in the longitudinal direction can be used together by a device that grips the steel plate for press contact.

【００５０】図６は、階段状に切削する別の態様を示す
図であり、３つの回転切削装置を回転させながら鋼板の
幅方向に送り、切削する状態を示す図であり、(a) は正
面図、(b) は後行鋼板の前方から見た図である。この装
置は、鋼板の端面を切削する２つの回転切削装置と、鋼
板の上・下面を切削する１つの回転切削装置を図のよう
に配置し、それぞれの回転切削装置を回転させながら鋼
板の幅方向に送ることによって、鋼板の端面と鋼板の上
・下面を階段状に切削するものである。FIG. 6 is a diagram showing another mode of stepwise cutting, showing a state in which three rotary cutting devices are rotated and fed in the width direction of the steel sheet to perform cutting, and (a) is The front view, (b) is the view seen from the front of the trailing steel plate. This device has two rotary cutting devices for cutting the end surface of the steel plate and one rotary cutting device for cutting the upper and lower surfaces of the steel plate as shown in the figure. By feeding in the direction, the end surface of the steel sheet and the upper and lower surfaces of the steel sheet are cut in steps.

【００５１】図１(c) に示す接合方法は、例えば図５お
よび図６で示す切削装置に、先端を鋭角に尖らしたバイ
トを、上下に１列に配置した切削装置を用いて切削する
ことによって、また先端を鋭角とした楔を上下に設け、
圧痕を付けることによって製作することができる。In the joining method shown in FIG. 1 (c), for example, the cutting device shown in FIGS. 5 and 6 is cut by using a cutting device in which cutting tools having sharply pointed tips are arranged in one row vertically. Also, by setting a wedge with a sharp tip at the top and bottom,
It can be manufactured by making indentations.

【００５２】II．鋼板を突き合わせて接合する場合： Ａ．鋼板を同一平面内に配置し、両材料の端部（突き合
わせ部）が平行になるように切削する場合；図７は、鋼
材を突き合わせて接合する場合の接合部の切削状態を示
す図であり、(a) は回転切削装置を鋼板の厚さ方向に移
動させ切削する状態を示す図、(b)および(c) は回転切
削装置を鋼板の幅方向に移動させ切削する状態を示す図
である。回転切削装置は、図２で示したものと同様であ
るが、幅方向に移動する平削りバイトタイプであっても
よい。II. When steel plates are butted and joined: A. When the steel sheets are arranged in the same plane and cut so that the ends (butting portions) of both materials are parallel to each other; FIG. 7 is a diagram showing a cutting state of the joining portion when the steel materials are butted and joined. , (A) is a diagram showing a state in which the rotary cutting device is moved in the thickness direction of the steel sheet for cutting, and (b) and (c) are diagrams showing a state in which the rotary cutting device is moved in the width direction of the steel sheet for cutting. is there. The rotary cutting device is similar to that shown in FIG. 2, but may be a planing bite type that moves in the width direction.

【００５３】切削は、図7(a)に示すように、鋼板１、２
を把持装置３、3'によって同一平面となるように把持
し、例えば板幅よりも長い切削部を有する回転切削装置
61を、鋼板の板厚方向に移動して切削する。また、同図
(b) および(c) に示す切削は、板厚よりも長い切削部を
有する回転切削装置61を、鋼板の板幅方向に移動して切
削する。なお、切削に際し、鋼板の把持方法および還元
雰囲気ガスなどの吹き付け装置の使用方法などは、図２
で説明した場合と同様である。また、切削した場合に
は、切削部が直線となりダレが生じない。このため接合
面積が大きくなり、高い接合強度が得られる。As shown in FIG. 7 (a), the cutting is performed on steel plates 1, 2
Is held by the gripping devices 3 and 3 ′ so as to be in the same plane, and has, for example, a cutting portion having a cutting portion longer than the plate width.
61 is moved in the plate thickness direction of the steel plate and cut. Also, the same figure
In the cutting shown in (b) and (c), a rotary cutting device 61 having a cutting portion longer than the plate thickness is moved in the plate width direction of the steel plate for cutting. For cutting the steel plate and using a reducing atmosphere gas blowing device, see Fig.
This is similar to the case described in. Further, when cut, the cut portion becomes a straight line, and sagging does not occur. For this reason, the bonding area becomes large and high bonding strength can be obtained.

【００５４】接合は、図１(d) に示すように、鋼板１、
２を把持装置３、3'によって同一平面となるように突き
合わせ、いずれかの把持装置に、公知の手段、例えば油
圧などの推力（鋼板を長手方向に押圧する力）を加え、
接合する。推力を加えることによって、接合面の凹凸を
均し、新生面を発生させて熱拡散を活発にして高い接合
力が得られる。As shown in FIG. 1 (d), the joint is made of steel plate 1,
2 are butted so as to be flush with each other by the gripping devices 3 and 3 ′, and a known means, for example, a thrust force such as hydraulic pressure (a force for pressing the steel plate in the longitudinal direction) is applied to any of the gripping devices,
To join. By applying a thrust force, the unevenness of the joint surface is leveled, a new surface is generated, heat diffusion is activated, and a high joint force is obtained.

【００５５】Ｂ．鋼板を重ね合わせ、重ね合わせ部を鋸
断する方法；図８は、重ね合わせた鋼板を鋸断する状態
を示す図である。63は回転鋸歯装置、７は公知の鋸歯移
動装置である。B. Method of stacking steel plates and sawing the stacked parts; FIG. 8 is a diagram showing a state of sawing the stacked steel plates. Reference numeral 63 is a rotary saw tooth device, and 7 is a known saw tooth moving device.

【００５６】移動装置７は、先端に回転鋸歯装置が取り
付けられたブラケット73を、２本の案内棒72で支え、ネ
ジ棒71を回転させることによってブラケットを移動さ
せ、回転鋸歯装置を移動させるものである。The moving device 7 supports a bracket 73 having a rotary saw-tooth device attached to the tip thereof with two guide rods 72, and rotates the screw rod 71 to move the bracket to move the rotary saw-tooth device. Is.

【００５７】切断は、両鋼板１、２を重ね合わせ、重ね
合わせ部を把持装置３、3'によって把持し、回転する鋸
歯装置63を鋸歯移動装置７によって鋼板の幅方向に移動
して切断する。鋸断に際して、鋼板の下側に吹き付け装
置５を設け、還元雰囲気ガスなどを吹き付け、切断され
た面の酸化を防止する。For cutting, both steel plates 1 and 2 are overlapped, the overlapping portions are gripped by the gripping devices 3 and 3 ', and the rotating saw tooth device 63 is moved by the saw tooth moving device 7 in the width direction of the steel plates to cut. . At the time of sawing, a blowing device 5 is provided on the lower side of the steel plate to blow a reducing atmosphere gas or the like to prevent oxidation of the cut surface.

【００５８】鋸断した場合の接合は、切断完了後に把持
装置を開放し、鋼板の端部（切り捨て部）14,24 を除去
した後、再び把持装置で把持し、鋼板を鋼板の厚さ方向
に移動させ、図１(d) に示すように同一平面に突き合わ
せ、鋼板の長手方向に押圧して行う。なお、接合作業中
は還元雰囲気ガスなどを吹き付け、酸化を防止する。For joining in the case of sawing, after the cutting is completed, the gripping device is opened, the end portions (cut-off portions) 14 and 24 of the steel plate are removed, and then the gripping device grips the steel plate again in the thickness direction of the steel plate. Then, as shown in FIG. 1 (d), they are abutted on the same plane and pressed in the longitudinal direction of the steel plate. During the joining work, a reducing atmosphere gas or the like is blown to prevent oxidation.

【００５９】これら上述の本発明の接合方法は、鋼板の
接合すべき部分を還元雰囲気中で切削し、還元雰囲気中
で接合するので接合力が高まり、圧延に際して破断など
の不具合が発生しない。In the above-described joining method of the present invention, the portions of the steel sheet to be joined are cut in a reducing atmosphere and joined in a reducing atmosphere, so that the joining force is increased and problems such as breakage do not occur during rolling.

【００６０】[0060]

【実施例】【Example】

〔実施例１〕板厚さ30mm、板幅 300mm、板長さ1000mmの
鋼板（Ｃ:0.1重量％、Si:0.5重量％、Mn:1.2重量％）を
1050℃に加熱して、図２に示す切削装置を用い、重ね合
わせ部の斜め切削を行った。Example 1 A steel plate (C: 0.1% by weight, Si: 0.5% by weight, Mn: 1.2% by weight) having a plate thickness of 30 mm, a plate width of 300 mm and a plate length of 1000 mm was used.
After heating to 1050 ° C., diagonal cutting of the overlapping portion was performed using the cutting device shown in FIG.

【００６１】切削装置は、図２に示すような円筒状回転
切削装置であり、長さが350 mmの円筒状バイト取付け治
具の表面に、刃先の軌跡が示す直径が308 mmとなるよう
にバイトを千鳥状に取り付けたものである。切削条件
は、回転速度1000rpm 、送り速度83.3 mm/s(5000mm/mi
n) として、重ね合わせ代30mmを勾配1/20の傾斜切削を
行った。The cutting device is a cylindrical rotary cutting device as shown in FIG. 2, so that the diameter indicated by the locus of the cutting edge is 308 mm on the surface of a cylindrical tool mounting jig having a length of 350 mm. The bites are attached in a staggered manner. The cutting conditions are a rotation speed of 1000 rpm and a feed rate of 83.3 mm / s (5000 mm / mi
As n), the overlap margin of 30 mm was cut with a slope of 1/20.

【００６２】切削に先立ち、直火還元炎を切削部に吹き
付け、切削は還元雰囲気の下で行なった。還元炎は、ノ
ズル内混合方式のバーナーを鋼板の幅方向に配置し、リ
ング状のスリットノズルからＬＰＧガス（６Ｎm³/hr ）
と酸素濃度60％の酸素富化空気（空気比ｍ＝0.6 ）の混
合ガスを燃焼させ、生成させた。なお、空気比ｍは、実
際に使用した空気量を完全燃焼に必要な空気量で除した
値である。Prior to cutting, a direct flame reducing flame was blown onto the cutting portion, and the cutting was performed in a reducing atmosphere. For reducing flame, a burner of mixing method in the nozzle is arranged in the width direction of the steel sheet, and LPG gas (6 Nm ³ / hr) is output from a ring-shaped slit nozzle.
And a mixed gas of oxygen-enriched air having an oxygen concentration of 60% (air ratio m = 0.6) was combusted and produced. The air ratio m is a value obtained by dividing the actually used air amount by the air amount required for complete combustion.

【００６３】切削後、還元炎を吹き付けたまま切削部を
重ね合わせ、300 トンプレスを用い鋼板の厚さ方向に押
圧し、重ね合わせ部が元の厚さとほぼ等しくなるまで圧
下し、接合した。このときの接合に必要な加圧力は210
トンであった。After cutting, the cut parts were overlapped while the reducing flame was being blown, and pressed in the thickness direction of the steel sheet using a 300 ton press, and the overlapped part was pressed down until it became substantially equal to the original thickness and joined. The pressure required for joining at this time is 210
It was a ton.

【００６４】接合後、冷却して接合部および母材から引
張試験片（幅15mm、厚さ30mm、長さ400 mm）を採取し、
室温で引張試験を行ったところ、全て母材部で破断し
た。破断強度は 250〜300 Ｎ/mm²であった。また、接合
部断面の顕微鏡観察を行った結果、接合界面には有害な
酸化物や介在物が観察されなかった。After joining, the specimen was cooled and tensile test pieces (width 15 mm, thickness 30 mm, length 400 mm) were taken from the joint and the base material,
When the tensile test was performed at room temperature, all fractured at the base metal part. The breaking strength was 250 to 300 N / mm ² . As a result of microscopic observation of the cross section of the joint, no harmful oxides or inclusions were observed at the joint interface.

【００６５】上記のように引張試験の結果、接合部で破
断しないことは、圧延中に接合部で破断することがな
く、圧延の連続化が可能となる。As described above, the fact that the joint does not break as a result of the tensile test makes it possible to continue the rolling without breaking the joint during rolling.

【００６６】〔実施例２〕実施例１に使用した鋼板を10
50℃に加熱して、図５に示す切削装置を用い、重ね合わ
せ部の階段状切削を行った。Example 2 The steel plate used in Example 1 was
After heating to 50 ° C., the cutting device shown in FIG. 5 was used to perform stepwise cutting of the overlapping portion.

【００６７】切削装置は、図５に示すような高さの異な
る平削りバイト621 を、バイト取付け治具624 の直交す
る基準面625 、626 に、千鳥状に多数組み込んだ階段状
切削装置62である。刃幅10mmの平削りバイト４本を２
列、15mmの４本を１列に千鳥状に組み込み、基準面から
刃先までの高さを、それぞれ0.75mm（切り込み量に相
当）違わせた。The cutting device is a step cutting device 62 in which a plurality of planing cutting tools 621 having different heights as shown in FIG. 5 are assembled in a zigzag manner on the reference planes 625 and 626 of the cutting tool mounting jig 624 at right angles. is there. Two 4 planing tools with a blade width of 10 mm
Four rows of 15 mm each were installed in a row in a zigzag manner, and the heights from the reference plane to the cutting edge were changed by 0.75 mm (corresponding to the depth of cut).

【００６８】この階段状切削装置を板幅方向に100 mm/s
の切削速度で移動させることによって、全板幅にわたり
重ね合わせ代30mm、鋼板の厚さ方向３mmの切削を行っ
た。なお、切削は、実施例１と同様に直火還元炎を吹き
付けて行った。This step-shaped cutting device was used in the plate width direction at 100 mm / s.
By moving at a cutting speed of, the overlapping margin was 30 mm and the steel plate was cut in the thickness direction of 3 mm over the entire width of the plate. The cutting was performed by blowing a direct flame reducing flame as in Example 1.

【００６９】切削後、還元炎を吹き付けたまま、切削部
を重ね合わせ、300 トンプレスを用い鋼板の厚さ方向に
押圧し、重ね合わせ部が元の厚さとほぼ等しくなるまで
圧下し、接合した。このときの接合に必要な加圧力は21
0 トンであった。After cutting, the cutting parts were overlapped with each other while the reducing flame was being blown, and pressed in the thickness direction of the steel sheet using a 300 ton press, and the superposed part was pressed down until it became almost equal to the original thickness and joined. . The pressure required for joining at this time is 21
It was 0 ton.

【００７０】接合後、鋼板温度が1000℃のとき引張試験
を行ったところ、破断は接合部でなく母材であった。そ
のときの接合強度は40〜50Ｎ/mm²であった。また、接合
部断面の顕微鏡観察を行った結果、接合界面には酸化物
や介在物が観察されなかった。なお、熱間仕上げ圧延機
では、鋼板にかかる張力は40Ｎ/mm²未満であり、1000℃
での接合強度が40Ｎ/mm²あれば十分である。After the joining, a tensile test was conducted at a steel plate temperature of 1000 ° C., and it was found that the fracture was not in the joined portion but in the base material. The bonding strength at that time was 40 to 50 N / mm ² . As a result of microscopic observation of the cross section of the joint, no oxide or inclusion was observed at the joint interface. In the hot finish rolling mill, the tension applied to the steel sheet is less than 40 N / mm ² ,
A bonding strength of 40 N / mm ² is sufficient.

【００７１】〔実施例３〕実施例１に使用した鋼板を10
50℃に加熱して、図７に示す切削装置を用い、ある間隔
を設け、同一平面内に突き合わせて配置された２つの鋼
板の端面を、同時に平行に切削した。Example 3 The steel sheet used in Example 1 was replaced by 10
After heating to 50 ° C., using the cutting device shown in FIG. 7, the end faces of two steel plates arranged at a certain interval and abutting in the same plane were cut in parallel at the same time.

【００７２】切削装置は、図7(a)に示すように、実施例
１に使用したのと同様な円筒状回転切削装置61を、回転
させながら板厚方向に移動させるものを使用した。ま
た、切削条件は、実施例１と同様である。As shown in FIG. 7 (a), the cutting device used was a cylindrical rotary cutting device 61 similar to that used in Example 1, which was moved in the plate thickness direction while being rotated. The cutting conditions are the same as in Example 1.

【００７３】切削後、把持装置３、3'で同一平面内に突
き合わせ、鋼板の長手方向に180 トンの推力を加え、ア
プセット量が６mmおよび15mmの接合を行った。After cutting, they were abutted in the same plane by the gripping devices 3 and 3 ', 180 tons of thrust was applied in the longitudinal direction of the steel plates, and welding with upset amounts of 6 mm and 15 mm was performed.

【００７４】接合後、冷却して接合部から引張試験片を
採取し、室温で引張試験を行ったところ、破断強度は20
0 Ｎ/mm²および250 Ｎ/mm²であった。また、接合部断面
の顕微鏡観察を行った結果、接合界面には酸化物や介在
物が観察されなかった。After the joining, the tensile strength was 20 when the tensile test piece was sampled from the joint after cooling and subjected to the tensile test at room temperature.
It was 0 N / mm ² and 250 N / mm ² . As a result of microscopic observation of the cross section of the joint, no oxide or inclusion was observed at the joint interface.

【００７５】〔実施例４〕実施例１に使用した鋼板を10
50℃に加熱して、図８に示す切削装置を用い、２つの鋼
板の端部を重ね合わせ、回転鋸歯装置で同時に切断し
た。Example 4 The steel sheet used in Example 1 was
It heated at 50 degreeC, the edge part of two steel plates was piled up using the cutting device shown in FIG. 8, and it cut simultaneously by the rotary saw-tooth device.

【００７６】切削装置は、図８に示すように、回転鋸歯
装置64の鋸歯を回転させながら、鋸歯移動装置７によっ
て板幅方向に移動させるものである。回転鋸歯は、刃先
の直径1000mm、歯数314 、幅６mmとして、回転速度200r
pm（切削速度628 ｍ/min）、送り速度100 mm/sで移動さ
せた。As shown in FIG. 8, the cutting device rotates the saw teeth of the rotary saw tooth device 64 while moving them in the plate width direction by the saw tooth moving device 7. The rotating saw blade has a blade edge diameter of 1000 mm, a number of teeth of 314 and a width of 6 mm, and a rotation speed of 200 r.
It was moved at pm (cutting speed 628 m / min) and feed rate 100 mm / s.

【００７７】切削後、把持装置３、3'で同一平面内に突
き合わせ、鋼板の長手方向に180 トンの推力を加え、ア
プセット量が６mmおよび15mmの接合を行った。After the cutting, the holding devices 3 and 3'abut against each other in the same plane, and a thrust of 180 tons is applied in the longitudinal direction of the steel plates to join the upset amounts of 6 mm and 15 mm.

【００７８】接合後、冷却して接合部から引張試験片を
採取し、室温で引張試験を行ったところ、破断強度は20
0 Ｎ/mm²および250 Ｎ/mm²であった。また、接合部断面
の顕微鏡観察を行った結果、接合界面には有害な酸化物
や介在物が観察されなかった。After the joining, the tensile strength was 20 when the tensile test piece was sampled from the joint after cooling and subjected to the tensile test at room temperature.
It was 0 N / mm ² and 250 N / mm ² . As a result of microscopic observation of the cross section of the joint, no harmful oxides or inclusions were observed at the joint interface.

【００７９】[0079]

【発明の効果】本発明方法の接合によれば、接合部の切
削または切断が還元雰囲気の下で確実に、しかも迅速に
実施でき、この酸化物のない切削面と還元炎による直火
加熱との相乗的な効果によって、接合強度の高い熱間鋼
材の接合ができる。こうして接合された鋼板は、次の仕
上圧延で破断することなく、連続的に圧延ができる。According to the joining method of the present invention, the joining portion can be cut or cut reliably and rapidly in a reducing atmosphere, and this oxide-free cutting surface and direct flame heating by a reducing flame are used. Due to the synergistic effect of, it is possible to join hot steel materials having high joining strength. The steel plates thus joined can be continuously rolled without breaking in the next finish rolling.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明方法の接合の態様を示す図であり、(a)
〜(c) は鋼板を重ね合わせてその厚さ方向に押圧して接
合する状態を示す図、(d) は鋼板を突き合わせてその長
手方向に押圧して接合する状態を示す図である。FIG. 1 is a diagram showing a bonding mode of the method of the present invention, (a)
6A to 6C are diagrams showing a state in which steel sheets are superposed and pressed in the thickness direction to be joined, and FIG. 8D is a diagram showing a state in which steel sheets are butted and pressed in the longitudinal direction to be joined.

【図２】圧接に先立って行う接合部の切削状態を示す図
であり、(a) は正面図、(b) は回転切削工具の平面図で
ある。FIG. 2 is a view showing a cutting state of a joint portion which is performed prior to pressure welding, (a) is a front view, and (b) is a plan view of a rotary cutting tool.

【図３】回転切削装置に円板状回転切削装置を使用した
場合の切削状態を示す図であり、(a) は正面図、(b) は
円板状回転切削工具の平面図である。FIG. 3 is a view showing a cutting state when a disc-shaped rotary cutting device is used as the rotary cutting device, (a) is a front view, and (b) is a plan view of the disc-shaped rotary cutting tool.

【図４】回転切削装置とその移動装置を示す図である。FIG. 4 is a diagram showing a rotary cutting device and its moving device.

【図５】接合部を階段状に切削する状態を示す図であ
り、(a) は切削の状態を示す図、(b) は階段状に切削す
る切削装置の平面図、(c) は同切削装置の断面図であ
る。5A and 5B are diagrams showing a state in which a joint is cut in a stepwise manner, in which FIG. 5A is a diagram showing a cutting state, FIG. 5B is a plan view of a cutting device for cutting in a stepwise manner, and FIG. It is sectional drawing of a cutting device.

【図６】階段状に切削する別の態様を示す図であり、３
つの回転切削装置を回転させながら鋼板の幅方向に移動
し切削する状態を示す図であり、(a) は正面図、(b) は
後行鋼板の前方から見た図である。FIG. 6 is a diagram showing another mode of cutting in steps.
It is a figure which shows the state which moves in the width direction of a steel plate and rotates while rotating two rotary cutting devices, (a) is a front view, (b) is the figure seen from the front of a trailing steel plate.

【図７】鋼材を突き合わせて接合する場合の接合部の切
削状態を示す図であり、(a) は回転切削装置21を鋼板の
厚さ方向に移動させ切削する状態を示す図、(b) および
(c) は回転切削装置21を鋼板の幅方向に移動させ切削す
る状態を示す図である。FIG. 7 is a view showing a cutting state of a joint portion when steel materials are butt-joined to each other, (a) shows a state in which a rotary cutting device 21 is moved in a thickness direction of a steel sheet and is cut, (b) and
(c) is a diagram showing a state in which the rotary cutting device 21 is moved in the width direction of the steel sheet for cutting.

【図８】重ね合わせた鋼板を鋸断する状態を示す図であ
る。FIG. 8 is a diagram showing a state in which steel plates that have been overlapped are sawed.

【符号の説明】[Explanation of symbols]

１：先行鋼板 ２：後行鋼板 ３：先行鋼板把持装置 3'：後行鋼板把持装置 ４：下押圧装置 4'：上押圧装置 ５：吹き付け装置 61：回転切削装置 611:バイト 612:円筒状バイト取付け治具 62：階段状切削装置 621:平削りバイト 624:バイト取付け治具 625,626:バイト取付け治具基準面 63：回転鋸歯装置 ７：鋸歯移動装置 71: ネジ棒 72: 案内棒 73: ブラケット 74：案内棒固定治具 75: ネジ棒駆動装置 ８：回転切削装置の移動装置 81：移動アーム 82：移動用圧力装置 83：移動台 84：傾斜面 1: Leading steel plate 2: Trailing steel plate 3: Leading steel plate gripping device 3 ': Trailing steel plate gripping device 4: Bottom pressing device 4': Top pressing device 5: Spraying device 61: Rotary cutting device 611: Bit 612: Cylindrical Tool holder jig 62: Step cutting tool 621: Planing tool 624: Tool holder jig 625,626: Tool holder jig reference surface 63: Rotating saw blade device 7: Saw blade moving device 71: Screw rod 72: Guide rod 73: Bracket 74: Guide rod fixing jig 75: Screw rod drive device 8: Moving device for rotary cutting device 81: Moving arm 82: Pressure device for moving 83: Moving stand 84: Inclined surface

フロントページの続き (51)Int.Cl.⁶ 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２３Ｋ 31/00 Ｂ２３Ｋ 31/00 Ｐ (72)発明者 岡田 誠司 大阪府大阪市中央区北浜４丁目５番33号住 友金属工業株式会社内 (72)発明者 沖 正海 東京都千代田区大手町１丁目１番１号住友 金属工業株式会社内 (72)発明者 田添 信広 神奈川県横浜市磯子区新中原町１番地石川 島播磨重工業株式会社横浜エンジニアリン グセンター内 (72)発明者 岩波 紀夫 神奈川県横浜市磯子区新中原町１番地石川 島播磨重工業株式会社横浜エンジニアリン グセンター内Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location B23K 31/00 B23K 31/00 P (72) Inventor Seiji Okada 4-533 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture No. Sumitomo Metal Industries, Ltd. (72) Inventor Masami Oki 1-1-1, Otemachi, Chiyoda-ku, Tokyo Sumitomo Metal Industries, Ltd. (72) Nobuhiro Tazoe 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Address Ishikawa Shima-Harima Heavy Industries Co., Ltd. Yokohama Engineering Center (72) Inventor Norio Iwanami 1 Shinagawa Nakajima-cho, Isogo-ku, Yokohama, Kanagawa Ishikawa Shima Harima Heavy Industries Co., Ltd. Yokohama Engineering Center

Claims (9)

【特許請求の範囲】[Claims] 【請求項１】熱間鋼材の端部を圧接する方法であって、
圧接に先立ち先行材の後端部と後行材の先端部を還元雰
囲気の下で切削または切断し、還元雰囲気の下で切削部
または切断部を重ね合わせた後、または突き合わせた
後、還元雰囲気の下で圧接することを特徴とする熱間鋼
材の接合方法。1. A method for press-bonding the ends of a hot steel material, which comprises:
Prior to crimping, the trailing edge of the preceding material and the leading edge of the following material are cut or cut in a reducing atmosphere, and the cutting or cutting portions are overlapped in a reducing atmosphere, or after abutting, the reducing atmosphere A method for joining hot steel materials, which comprises performing pressure welding under the pressure. 【請求項２】熱間鋼材の端部を重ね合わせて圧接する方
法であって、圧接に先立ち先行材の後端部と後行材の先
端部を還元雰囲気の下で全幅の厚さが端部に向かって漸
減する斜め切削を行い、切削された両傾斜面を還元雰囲
気の下で重ね合わせ、還元雰囲気の下で圧接することを
特徴とする熱間鋼材の接合方法。2. A method of superimposing the end portions of hot steel materials and press-contacting each other, wherein the rear end portion of the preceding material and the front end portion of the following material have a full-width end under a reducing atmosphere prior to the pressure welding. A method for joining hot steel materials, which comprises performing oblique cutting that gradually decreases toward a portion, overlapping the cut inclined surfaces under a reducing atmosphere, and performing pressure welding under a reducing atmosphere. 【請求項３】熱間鋼材の端部を重ね合わせて圧接する方
法であって、圧接に先立ち先行材の後端部と後行材の先
端部を還元雰囲気の下でそれぞれ階段状に切削し、還元
雰囲気の下で階段状に切削された部分を重ね合わせ、還
元雰囲気の下で圧接することを特徴とする熱間鋼材の接
合方法。3. A method in which the end portions of hot steel materials are overlapped and pressure-welded to each other, and the rear end portion of the preceding material and the tip end portion of the following material are each cut in a stepwise manner under a reducing atmosphere prior to the pressure welding. A method for joining hot steel products, characterized in that stepwise cut portions are overlapped in a reducing atmosphere and pressure welding is performed in the reducing atmosphere. 【請求項４】熱間鋼材の端部を突き合わせて圧接する方
法であって、圧接に先立ち先行材の後端部と後行材の先
端部を同一平面内に配置し、還元雰囲気の下で両材料の
先端部（突き合わせ部）を平行に切削し、還元雰囲気の
下で両切削面を突き合わせ、還元雰囲気の下で圧接する
ことを特徴とする熱間鋼材の接合方法。4. A method of abutting the ends of a hot-worked steel material in abutting contact with each other, wherein the trailing end portion of the preceding material and the leading end portion of the following material are arranged in the same plane prior to the pressure welding, and under a reducing atmosphere. A method for joining hot steel materials, characterized in that the tip portions (butting portions) of both materials are cut in parallel, both cutting surfaces are butted under a reducing atmosphere, and pressure welding is performed under a reducing atmosphere. 【請求項５】熱間鋼材の端部を突き合わせて圧接する方
法であって、圧接に先立ち先行材の後端部と後行材の先
端部を重ね合わせ、重ね合わせ部を還元雰囲気の下で回
転鋸歯で切断し、還元雰囲気の下で切断面を突き合わ
せ、還元雰囲気の下で圧接することを特徴とする熱間鋼
材の接合方法。5. A method of abutting the ends of a hot steel material together for pressure welding, wherein the trailing end of the preceding material and the leading end of the following material are overlapped prior to the pressure welding, and the overlapped portion is under a reducing atmosphere. A method for joining hot steel materials, which comprises cutting with a rotary saw blade, butting the cut surfaces against each other in a reducing atmosphere, and pressing under a reducing atmosphere. 【請求項６】熱間鋼材の端部を重ね合わせて圧接する装
置であって、先行材の後端部と後行材の先端部とをそれ
ぞれ把持する把持装置と、前記把持装置で上下段違い状
に平行に置かれた先行材の後端部と後行材の先端部との
間に配設された回転切削装置と、それぞれの熱間鋼材先
端部の片面を厚さが端部に向かって漸減する方向に斜め
に切削する前記回転切削装置を移動させる装置と、前記
斜め切削された面を重ね合わせ押圧する装置と、熱間鋼
材の切削部および押圧部を還元雰囲気に保つ装置とから
なる熱間鋼材の接合装置。6. A device for overlapping and press-contacting ends of hot steel materials, which comprises a gripping device for gripping a trailing end of a preceding material and a leading end of a trailing material, respectively, and a step difference between the gripping device. In parallel with each other, the rotary cutting device is arranged between the trailing edge of the preceding material and the leading edge of the following material, and the thickness of one side of each hot steel tip is directed toward the edge. From a device that moves the rotary cutting device that obliquely cuts in a direction that gradually decreases, a device that overlaps and presses the obliquely cut surfaces, and a device that maintains the cutting portion and pressing portion of the hot steel material in a reducing atmosphere Hot steel joining equipment. 【請求項７】熱間鋼材の端部を重ね合わせて圧接する装
置であって、先行材の後端部と後行材の先端部とをそれ
ぞれ把持する把持装置と、前記把持装置で上下段違い状
に平行に置かれた先行材の後端部と後行材の先端部との
間に配設され、先行材後端部と後行材先端部をそれぞれ
階段状に切削する装置と、階段状に切削する装置を熱間
鋼材の幅方向に移動させる装置と、階段状に切削された
端部を重ね合わせて押圧する装置と、熱間鋼材の切削部
および押圧部を還元雰囲気に保つ装置とからなる熱間鋼
材の接合装置。7. A device for superimposing the end portions of hot steel materials and press-contacting each other, wherein the gripping device grips a trailing end portion of a preceding material and a leading end portion of a trailing material, respectively, and the gripping device is vertically different. Placed between the trailing edge of the preceding material and the leading edge of the trailing material, which are placed in parallel with each other, and cutting the trailing edge of the leading material and the leading edge of the trailing material in steps, For moving a cutting device in the width direction of the hot steel product, a device for overlapping and pressing the end parts cut in steps, and a device for keeping the cutting part and the pressing part of the hot steel product in a reducing atmosphere A joining device for hot steel materials. 【請求項８】熱間鋼材の端部を突き合わせて圧接する装
置であって、熱間鋼材の先行材の後端部と後行材の先端
部を同一平面内に把持する把持装置と、熱間鋼材の先行
材後端部と後行材先端部との間に挿入し、両材料を同一
平面内で平行に切削する切削装置と、前記切削装置を熱
間鋼材の厚さ方向または幅方向に移動させる装置と、切
削された端面を突き合わせ押圧する装置と、熱間鋼材の
切削部および突き合わせ部を還元雰囲気に保つ装置とか
らなる熱間鋼材の接合装置。8. A device for abutting and pressing the ends of a hot-working steel material against each other, and a device for gripping the trailing end of the preceding material of the hot-working steel and the leading end of the following material in the same plane, A cutting device that is inserted between the trailing end part and the leading end part of the trailing steel of the hot steel, and cuts both materials in parallel in the same plane, and the cutting device is the thickness direction or the width direction of the hot steel. A device for joining hot steel products, which comprises: a device for moving the end faces of the hot steel products to be pressed against each other; and a device for maintaining the cutting portion and the butted parts of the hot steel products in a reducing atmosphere. 【請求項９】熱間鋼材の端部を突き合わせて圧接する装
置であって、熱間鋼材の先行材の後端部と後行材の先端
部を重ね合わせて把持する把持装置と、重ね合わせ部を
切断する回転鋸歯装置と、回転鋸歯装置を熱間鋼材の幅
方向に移動させる装置と、鋸断された端面を突き合わせ
押圧する装置と、熱間鋼材の鋸断部および突き合わせ部
を還元雰囲気に保つ装置とからなる熱間鋼材の接合装
置。9. A device for abutting and pressing the ends of a hot-working steel material together, and a gripping device for superposing and holding a trailing end portion of a preceding material and a leading end portion of a following material of the hot-working steel material, Rotating sawtooth device for cutting parts, a device for moving the rotating sawtooth device in the width direction of hot steel, a device for butting and pressing the sawed end face, and a reducing atmosphere for the sawing and butting parts of hot steel A hot steel joining device consisting of a device for keeping hot steel.