JP3369256B2 - Lap seam welding method for steel plate - Google Patents
Lap seam welding method for steel plateInfo
- Publication number
- JP3369256B2 JP3369256B2 JP16301493A JP16301493A JP3369256B2 JP 3369256 B2 JP3369256 B2 JP 3369256B2 JP 16301493 A JP16301493 A JP 16301493A JP 16301493 A JP16301493 A JP 16301493A JP 3369256 B2 JP3369256 B2 JP 3369256B2
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- steel sheet
- seam welding
- thickness
- lap seam
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、鋼板の連続処理ライン
における、先行鋼板と後行鋼板の端部同士を重ね合わせ
て溶接することで両鋼板を接合するラップシーム溶接方
法に関するものである。
【０００２】
【従来の技術】鋼板の生産を連続的に実施する連続処理
ラインにおいては、例えば，特開平４−２８８９０９号
公報等に記載されているように、ラップシーム溶接方法
によって鋼板同士を接合することが広く行われている。
そのラップシーム溶接は、図４に示すように、先行鋼板
７の尾端部，及び後行鋼板８の先端部をそれぞれクラン
プ装置１，２で挟持し、対置する両鋼板７，８の端部を
シャーで切断して揃えた後、パスラインに沿って両クラ
ンプ装置１，２を相対的に接近させることで、先行鋼板
７の尾端部と後行鋼板８の先端部を所定の重ね代幅だけ
上下に重ね合わせる。その状態で、上下に対向する一対
の円板電極１３ａ，１３ｂによって上記重ね部分を加圧
保持すると同時に通電して溶接する。
【０００３】
【発明が解決しようとする課題】しかしながら、上記の
ような従来のラップシーム溶接方法では、単に、パスラ
インに沿って先行鋼板７と後行鋼板８を相対的に接近さ
せて端部同士を重ね合わせるので、先行鋼板７の下面と
後行鋼板８の下面とが同一平面上に位置している。
【０００４】このため、処理する鋼板が高張力材等の高
剛性の鋼板の場合には、重ね合わせる先行鋼板７と後行
鋼板８の端部がそれぞれ上下に大きく曲がることで、両
者の重ね合わせ面がそれぞれ反対方向に円弧を描いた状
態となって密着し難く、溶接不良が発生する恐れがあっ
た。本発明は、上記のような問題点に着目してなされた
もので、高剛性の鋼板であても、前後鋼板の重ね面を密
着させることを目的としている。
【０００５】
【課題を解決するための手段】上記目的を達成するため
に、本発明の鋼板のラップシーム溶接方法は、先行鋼板
の尾端部と後行鋼板の先端部とをそれぞれクランプ装置
で挟持した後、先行鋼板と後行鋼板の端部同士を重ね合
わせて溶接するラップシーム溶接方法において、先行鋼
板の板厚ｔ1 ，及び後行鋼板の板厚ｔ2 を測定し、測定
した板厚値に応じて、相対的に、上記重ね合わせた際に
下側となる鋼板の下面が、上側となる鋼板の下面より、
ａ×（ｔ1 ＋ｔ2 ）〔但し、０．４≧ａ≧０．１〕だけ
下げた状態となるように上記クランプ装置による挟持位
置を上下方向に動かした後、上記先行鋼板と後行鋼板の
端部を重ね合わせて溶接することを特徴としている。
【０００６】
【作用】先行鋼板の尾端部と後行鋼板の先端部とをそれ
ぞれクランプ装置で挟持して、重ね合わせ部で下側に位
置する鋼板側を、相対的に他方の鋼板よりも測定した板
厚値に応じて下方にオフセットさせてから重ね合わせる
ことで、重ね合わされる両鋼板端部の上下方向への曲が
りがそれぞれ小さくなる。これによって、重ね合わされ
る端部の各接触面が描く円弧が平面に近づき、よって、
両者の重ね合わせ面が密着し易くなり、鋼板が高張力鋼
等の高剛性材であっても溶接不良が低減する。
【０００７】なお、上記下方へのオフセット量を、ａ×
（ｔ1 ＋ｔ2 ）〔但し、０．４≧ａ≧０．１〕としたの
は、次の理由による。ラップシーム溶接の場合、重ね合
わせ部の板厚が先行鋼板と後行鋼板との平均板厚の１．
２〜１．８倍であれば、良好な溶接部品が得られること
が経験的にわかっている。平均板厚の１．８倍を超える
と充分な溶接強度が得られず、一方、１．２未満にする
には電極に加圧力を大きくしなければならないため、電
極の鋼板幅方向移動中に鋼板にしわが発生したり、引き
ちぎりが発生する恐れがある。
【０００８】このため、上記ａを、
（１．２〜１．８−１）×１／２ ＝ ０．１〜０．４
とした。
【０００９】
【実施例】本発明の実施例を図面に基づいて説明する。
まず構成を説明すると、図２に示すように、パスライン
に沿い且つ所定間隔をあけて入側クランプ装置１と出側
クランプ装置２とが対向配置され、その両クランプ装置
１，２の間に溶接機本体３が配置されて溶接機が構成さ
れ、その溶接機の入側には、搬送されてくる鋼板の板厚
を測定する板厚計４が配設されている。その板厚計４は
コントローラ５に接続されていて、測定した板厚値に応
じた板厚信号をコントローラ５に供給可能となってい
る。
【００１０】また、上記各クランプ装置１，２は、それ
ぞれパスラインを挟んで上下に対向する一対のクランプ
から構成され、図示しない油圧シリンダ装置によって駆
動されてそれぞれ鋼板を上下から挟持固定するようにな
っている。さらに、入側クランプ装置１の下端部には、
図１に示すように、モータ等を主構成部品とする位置制
御装置６が設置されていて、その位置制御装置６の作動
によって該入側クランプ装置１が昇降可能となってい
る。その位置制御装置６は、コントローラ５に接続され
ていて、該コントローラ５からの駆動信号によって駆動
制御されるようになっている。
【００１１】コントローラ５は、上記板厚計４からの板
厚信号をもとに、先行鋼板７及び後行鋼板８の板厚の加
算をし、その加算値をａ倍（例えば，ａ＝０．２）して
オフセット値Ｓを算出し、そのオフセット値Ｓの距離だ
け、設定されているパスラインから入側クランプ装置１
が下方に移動するように、位置制御装置６を介して該入
側クランプ装置１を上下動するようになっている。
【００１２】また、溶接機本体３は、図３に示すよう
に、縦断面コ字形状のキャリッジフレーム１０が、アク
チュエータ１１によって板幅方向へ往復移動可能となっ
ていて、前進した状態では、該キャリッジフレーム１０
の上下の腕部１０ａ，１０ｂがパスラインを挟んで上下
に対向するようになっている。そして、上記キャリッジ
フレーム１０の腕部１０ａ，１０ｂに上下に対向するシ
ャー１２及び円板電極１３がそれぞれ設置されている。
【００１３】上記シャー１２は、上下に刃先を対向した
上刃１２ａと下刃１２ｂの組が２対，パスライン方向
（腕部１０ａ，１０ｂの幅方向）へ所定間隔をあけて配
置され、それぞれ板幅方向（枠部の進退方向）へ直線状
に延びるようにして上記上下の腕部１０ａ，１０ｂに設
置されていて、上刃１２ａが同期をとって上下動するこ
とで、パスライン方向に対置させた先行鋼板７と後行鋼
板８の端部を同時に切断可能となっている。
【００１４】また、円板電極１３は上電極１３ａと下電
極１３ｂとからなり、その上下の電極１３ａ，１３ｂ
が、それぞれ上下の腕部１０ａ，１０ｂに対向設置さ
れ、図示しない油圧シリンダ装置によって上下方向に移
動可能となって、鋼板の重ね合わせ部を加圧保持すると
同時に通電して溶着するようになっている。そして、上
記のような溶接機による溶接では、溶接機入側で、搬送
されてくる鋼板の板厚が逐次，板厚計４で測定され、そ
の板厚信号がコントローラ５に供給され、さらに、先行
鋼板７の尾端部が出側クランプ装置２によって挟持さ
れ、後行鋼板８の先端部が入側クランプ装置１によって
挟持される。
【００１５】次に、予め後退していたキャリッジフレー
ム１０が前進し、油圧シリンダを駆動して上刃１２ａを
下降させて、上記両鋼板７，８の端部を同時に切断す
る。これによって、両鋼板７，８の端部は一定距離をも
って対置した状態となる。次に、上刃１２ａを上昇させ
た後に、コントローラ５が、前述のように上記板厚信号
よりオフセット値Ｓを算出し、入側クランプ装置１を該
オフセット値Ｓだけ設定パスラインよりも下方に位置す
るように、位置制御装置６を介して上下動させる。これ
によって、後行鋼板８の下面が先行鋼板７の下面よりも
上記オフセット値Ｓだけ下方にオフセットした状態とな
る。
【００１６】次に、入側クランプ装置１を出側クランプ
装置２に向けて前進させて、所定の重ね代幅で，先行鋼
板７と後行鋼板８の端部を相互に重ね合わせる。このと
き、後行鋼板８を下方にオフセットさせたことで、重ね
合わせ部を形成する各鋼板端部の上下方向への曲がりが
従来よりも小さくなって、両鋼板７，８の端部は従来よ
りも広い面積で接触するようになる。
【００１７】次に、上下の電極１３ａ，１３ｂ間がパス
ライン上に位置するようにキャリッジフレーム１０を移
動させ、その上下の電極１３ａ，１３ｂを上下方向に移
動させて、該上下の電極１３ａ，１３ｂによって上記重
ね合わせ部を加圧保持すると同時に通電して溶着する。
このように、本実施例では、先行鋼板７と後行鋼板８の
重ね合わせ部の接触面積が従来よりも広くなって、接合
する鋼板が高張力材等の高剛性材であっても良好なシー
ム溶接が可能となる。
【００１８】なお、上記実施例では、後行鋼板８を下方
にオフセットするように制御しているが、相対的に先行
鋼板７を上方にオフセットさせるように制御してもよ
い。また、後行鋼板８が重ね合わせ部で上側にくるよう
であれば、該後行鋼板８が上方にオフセットするように
入側クランプ装置１を上下動させる。
【００１９】
【発明の効果】以上説明してきたように、本発明の鋼板
のラップシーム溶接方法では、簡単な方法で、接合する
鋼板が高張力材等の高剛性材であっても良好なシーム溶
接が可能となって、溶接不良を低減することが出来ると
いう効果がある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining two steel sheets by overlapping and welding the ends of a preceding steel sheet and a following steel sheet in a continuous steel sheet processing line. And a lap seam welding method. 2. Description of the Related Art In a continuous processing line for continuously producing steel sheets, steel sheets are joined by a lap seam welding method as described in, for example, Japanese Patent Laid-Open No. 4-288909. It is widely done.
In the lap seam welding, as shown in FIG. 4, the tail end of the preceding steel plate 7 and the tip end of the succeeding steel plate 8 are clamped by the clamp devices 1 and 2 respectively, and the end portions of the opposite steel plates 7 and 8 are opposed to each other. Are cut and aligned with a shear, and then the clamping devices 1 and 2 are moved relatively close to each other along the pass line so that the tail end of the preceding steel plate 7 and the front end of the succeeding steel plate 8 have a predetermined overlap margin. Overlap only up and down by width. In this state, the overlapping portion is pressurized and held by a pair of vertically opposed disk electrodes 13a and 13b, and at the same time, welding is performed by energizing. [0003] However, in the conventional lap seam welding method as described above, the leading steel plate 7 and the following steel plate 8 are simply brought relatively close to each other along the pass line, and the end portion is made to end. Since they are overlapped with each other, the lower surface of the preceding steel plate 7 and the lower surface of the following steel plate 8 are located on the same plane. For this reason, when the steel plate to be treated is a high-rigidity steel plate such as a high-tensile material, the ends of the leading steel plate 7 and the trailing steel plate 8 to be superimposed are bent greatly up and down, so that the superimposition of both steel plates is performed. The surfaces drawn arcs in opposite directions, making it difficult for the surfaces to adhere to each other, and possibly causing poor welding. The present invention has been made in view of the above-described problems, and has an object to make the overlapping surfaces of the front and rear steel plates adhere to each other even with a highly rigid steel plate. [0005] To achieve the above object, resolving means for provided a steel sheet method lap seam welding of the present invention, prior steel
Clamping device for the tail end of the
In the lap seam welding method in which the ends of the preceding steel sheet and the succeeding steel sheet are overlapped and welded, the thickness t 1 of the preceding steel sheet and the thickness t 2 of the following steel sheet are measured and measured.
Depending on the thickness of the steel sheet, the lower surface of the lower steel plate when superposed is lower than the lower surface of the upper steel plate,
a × (t 1 + t 2 ) [however, 0.4 ≧ a ≧ 0.1] so as to be in a state of being lowered by the clamping device.
After moving the device up and down,
It is characterized in that the ends are overlapped and welded. The tail end of the preceding steel plate and the front end of the following steel plate are separated from each other.
A plate that is clamped by each clamp device and the lower side of the steel plate at the overlapped part is measured relative to the other steel plate
In Rukoto overlay from is offset downward in accordance with the thickness value, bending becomes smaller each in the vertical direction of both the steel sheet edge portions to be overlapped. This causes the arc drawn by each contact surface of the overlapped ends to approach a plane, thus
The superposed surfaces of the two easily come into close contact with each other, and poor welding is reduced even if the steel plate is a high- rigidity material such as high- tensile steel. Note that the downward offset amount is represented by a ×
(T 1 + t 2 ) [where 0.4 ≧ a ≧ 0.1] is based on the following reason. In the case of lap seam welding, the thickness of the overlapped portion is equal to the average thickness of the preceding steel sheet and the following steel sheet.
It has been empirically known that if the ratio is 2 to 1.8 times, a good welded part can be obtained. If the average thickness exceeds 1.8 times, sufficient welding strength cannot be obtained. On the other hand, if the average thickness is less than 1.2, the electrode must be applied with a large pressing force. The steel plate may be wrinkled or torn. For this reason, the value a is set to (1.2 to 1.8-1) × 1/2 = 0.1 to 0.4. An embodiment of the present invention will be described with reference to the drawings.
First, the configuration will be described. As shown in FIG. 2, an entrance-side clamp device 1 and an exit-side clamp device 2 are arranged facing each other along a pass line and at a predetermined interval. The welding machine body 3 is arranged to constitute a welding machine, and a thickness gauge 4 for measuring the thickness of the conveyed steel plate is arranged on the entrance side of the welding machine. The thickness gauge 4 is connected to the controller 5 and can supply a thickness signal corresponding to the measured thickness value to the controller 5. Each of the clamp devices 1 and 2 is composed of a pair of clamps vertically opposed to each other with a pass line therebetween, and is driven by a hydraulic cylinder device (not shown) to clamp and fix the steel plate from above and below. Has become. Furthermore, at the lower end of the entrance-side clamp device 1,
As shown in FIG. 1, a position control device 6 having a motor or the like as a main component is installed, and the entrance-side clamp device 1 can be moved up and down by the operation of the position control device 6. The position control device 6 is connected to the controller 5 and is driven and controlled by a drive signal from the controller 5. The controller 5 adds the thicknesses of the preceding steel plate 7 and the following steel plate 8 based on the thickness signal from the thickness gauge 4 and multiplies the added value by a times (for example, a = 0). .. 2) to calculate the offset value S, and enter the input-side clamp device 1 from the set pass line by the distance of the offset value S.
The entrance-side clamp device 1 is moved up and down via the position control device 6 so as to move downward. As shown in FIG. 3, the carriage frame 10 having a U-shaped vertical cross section can be reciprocated in the plate width direction by an actuator 11, and when the welding machine body 3 is moved forward, as shown in FIG. Carriage frame 10
The upper and lower arms 10a and 10b are vertically opposed to each other across a pass line. Further, a shear 12 and a disk electrode 13 which are vertically opposed to the arm portions 10a and 10b of the carriage frame 10, respectively, are provided. The shear 12 has two pairs of upper blades 12a and lower blades 12b whose cutting edges are opposed to each other at predetermined intervals in the pass line direction (the width direction of the arms 10a and 10b). The upper blades 12a and 10b are installed on the upper and lower arms 10a and 10b so as to extend linearly in the plate width direction (the forward and backward directions of the frame portion). The ends of the leading steel plate 7 and the trailing steel plate 8 that are opposed to each other can be cut at the same time. The disk electrode 13 comprises an upper electrode 13a and a lower electrode 13b, and the upper and lower electrodes 13a, 13b
Are installed opposite to the upper and lower arms 10a and 10b, respectively, and can be moved in the vertical direction by a hydraulic cylinder device (not shown). I have. In the welding by the welding machine as described above, the thickness of the conveyed steel plate is sequentially measured by the thickness gauge 4 on the entrance side of the welding machine, and the thickness signal is supplied to the controller 5. The tail end of the preceding steel plate 7 is clamped by the exit clamp device 2, and the tip end of the succeeding steel plate 8 is clamped by the entrance clamp device 1. Next, the carriage frame 10, which has been retracted in advance, moves forward, drives the hydraulic cylinder to lower the upper blade 12a, and cuts the ends of the steel plates 7, 8 at the same time. As a result, the ends of the steel plates 7 and 8 face each other with a certain distance. Next, after raising the upper blade 12a, the controller 5 calculates the offset value S from the thickness signal as described above, and moves the entry-side clamp device 1 by the offset value S below the set pass line. It is moved up and down via the position control device 6 so as to be located. As a result, the lower surface of the succeeding steel plate 8 is offset below the lower surface of the preceding steel plate 7 by the offset value S. Next, the entrance-side clamp device 1 is advanced toward the exit-side clamp device 2, and the ends of the preceding steel plate 7 and the succeeding steel plate 8 are overlapped with each other with a predetermined overlap width. At this time, since the trailing steel sheet 8 is offset downward, the bending of the ends of the steel sheets forming the overlapped portion in the vertical direction becomes smaller than before, and the ends of both the steel sheets 7 and 8 become the conventional. It comes into contact with a larger area than that. Next, the carriage frame 10 is moved so that the space between the upper and lower electrodes 13a and 13b is located on the pass line, and the upper and lower electrodes 13a and 13b are moved in the vertical direction. At 13b, the overlapping portion is pressed and held, and at the same time, is electrically connected and welded.
As described above, in the present embodiment, the contact area of the superposed portion of the preceding steel plate 7 and the following steel plate 8 becomes larger than before, and even if the steel plate to be joined is a high-rigidity material such as a high-tensile material, it is favorable. Seam welding becomes possible. In the above embodiment, the following steel plate 8 is controlled to be offset downward, but it may be controlled to relatively offset the preceding steel plate 7 upward. If the trailing steel plate 8 comes to the upper side at the overlapping portion, the entry-side clamp device 1 is moved up and down so that the trailing steel plate 8 is offset upward. As described above, according to the lap seam welding method for a steel sheet of the present invention, a good seam can be obtained by a simple method even if the steel sheet to be joined is a high-rigidity material such as a high-tensile material. There is an effect that welding becomes possible and welding defects can be reduced.
【図面の簡単な説明】
【図１】本発明に係る実施例のラップシーム溶接方法を
示す概略構成図である。
【図２】本発明に係る実施例の溶接機を示す図である。
【図３】本発明に係る実施例の溶接機本体を示す図であ
る。
【図４】従来のラップシーム溶接方法を示す概略構成図
である。
【符号の説明】
１，２ クランプ装置
４ 板厚計
５ コントローラ
６ 位置制御装置
７ 先行鋼板
８ 後行鋼板
１３ａ，１３ｂ 電極BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing a lap seam welding method according to an embodiment of the present invention. FIG. 2 is a view showing a welding machine according to an embodiment of the present invention. FIG. 3 is a view showing a welding machine main body according to an embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing a conventional lap seam welding method. [Description of Signs] 1, 2 Clamping device 4 Thickness gauge 5 Controller 6 Position control device 7 Leading steel plate 8 Trailing steel plate 13a, 13b Electrode
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小松 富夫 千葉県千葉市中央区川崎町１番地 川崎 製鉄株式会社千葉製鉄所内 (72)発明者 清野 芳一 千葉県千葉市中央区川崎町１番地 川崎 製鉄株式会社千葉製鉄所内 (56)参考文献 特開 平４−250334（ＪＰ，Ａ) 実開 平３−31075（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 11/06 B21B 15/00 B23K 11/24 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tomio Komatsu 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Works Co., Ltd. Chiba Works (72) Inventor Yoshikazu Kiino 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki (56) References JP-A-4-250334 (JP, A) JP-A-3-31075 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) B23K 11/06 B21B 15/00 B23K 11/24
Claims (1)
をそれぞれクランプ装置で挟持した後、先行鋼板と後行
鋼板の端部同士を重ね合わせて溶接するラップシーム溶
接方法において、先行鋼板の板厚ｔ1 ，及び後行鋼板の
板厚ｔ2 を測定し、測定した板厚値に応じて、相対的
に、上記重ね合わせた際に下側となる鋼板の下面が、上
側となる鋼板の下面より、ａ×（ｔ1 ＋ｔ2 ）〔但し、
０．４≧ａ≧０．１〕だけ下げた状態となるように上記
クランプ装置による挟持位置を上下方向に動かした後、
上記先行鋼板と後行鋼板の端部を重ね合わせて溶接する
ことを特徴とする鋼板のラップシーム溶接方法。(57) [Claims 1] The tail end of the preceding steel plate and the front end of the following steel plate
In the lap seam welding method in which the ends of the preceding steel sheet and the succeeding steel sheet are overlapped and welded after each of them is clamped by the clamp device, the thickness t 1 of the preceding steel sheet and the thickness t 2 of the following steel sheet are measured. Then, in accordance with the measured thickness, the lower surface of the steel plate that is lower when the sheets are superposed is relatively a × (t 1 + t 2 ) [where,
0.4 ≧ a ≧ 0.1] so that the state of lowering the only the
After moving the holding position by the clamp device up and down,
A lap seam welding method for a steel sheet, wherein the ends of the preceding steel sheet and the following steel sheet are overlapped and welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16301493A JP3369256B2 (en) | 1993-06-30 | 1993-06-30 | Lap seam welding method for steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16301493A JP3369256B2 (en) | 1993-06-30 | 1993-06-30 | Lap seam welding method for steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0716755A JPH0716755A (en) | 1995-01-20 |
| JP3369256B2 true JP3369256B2 (en) | 2003-01-20 |
Family
ID=15765560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16301493A Expired - Fee Related JP3369256B2 (en) | 1993-06-30 | 1993-06-30 | Lap seam welding method for steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3369256B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100340808B1 (en) * | 1997-12-20 | 2002-10-18 | 주식회사 포스코 | A method for adjusting level of lower electrode wheel in mash seam welding |
| JP2007167895A (en) * | 2005-12-21 | 2007-07-05 | Nachi Fujikoshi Corp | Seam welding apparatus, seam welding robot system and seam welding method |
| CN105312797B (en) * | 2014-07-10 | 2017-02-15 | 宝山钢铁股份有限公司 | Clamping device for preventing location play of welding machine |
-
1993
- 1993-06-30 JP JP16301493A patent/JP3369256B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0716755A (en) | 1995-01-20 |
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