JPS58151971A - On-line jointing device for hot-rolled material - Google Patents
On-line jointing device for hot-rolled materialInfo
- Publication number
- JPS58151971A JPS58151971A JP3404882A JP3404882A JPS58151971A JP S58151971 A JPS58151971 A JP S58151971A JP 3404882 A JP3404882 A JP 3404882A JP 3404882 A JP3404882 A JP 3404882A JP S58151971 A JPS58151971 A JP S58151971A
- Authority
- JP
- Japan
- Prior art keywords
- jointing
- electrode
- clamp
- rolling mill
- guide member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 238000005304 joining Methods 0.000 claims description 20
- 238000003466 welding Methods 0.000 abstract description 27
- 238000005098 hot rolling Methods 0.000 description 5
- 101100407060 Caenorhabditis elegans par-6 gene Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- OVSKIKFHRZPJSS-UHFFFAOYSA-N 2,4-D Chemical compound OC(=O)COC1=CC=C(Cl)C=C1Cl OVSKIKFHRZPJSS-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/08—Seam welding not restricted to one of the preceding subgroups
- B23K11/087—Seam welding not restricted to one of the preceding subgroups for rectilinear seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は熱間圧延材のオンライン接合装置に関するもの
である@
従来の熱間圧延ラインは第1図に示すように。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an online joining device for hot rolled materials. A conventional hot rolling line is as shown in FIG.
加熱炉1からスラブを1本づつ抽出し、粗圧延機群2に
おいて所定厚さまで圧延されてシートバーとなり、搬送
テーブル3により搬送され、仕上圧延機群4において薄
くされてストリップとなり、コイラー5によってコイル
状に巻き取られるようになっている。Slabs are extracted one by one from the heating furnace 1, rolled to a predetermined thickness in the rough rolling mill group 2 to become sheet bars, conveyed by the conveying table 3, thinned into strips in the finishing mill group 4, and then rolled into strips by the coiler 5. It is designed to be wound into a coil.
前記従来の熱間圧延ラインにおいては、スラブが一本ず
つ粗圧延及び仕上圧延される非連続圧延によって圧延さ
れることから、下記のような問題点がある。即ち、
(1)各スラブを夫々粗圧延機群2.及び仕上圧延機群
4の上下ロールに、円滑に噛み込ませる必要があり、各
スラブの先端形状及び板厚等を調整する必要がある・
(2)各スラブの先端部及び後端部は、温度が低下する
ため、製品材質が不均一になる。In the conventional hot rolling line, the slabs are rolled by discontinuous rolling in which each slab is rough-rolled and finished-rolled, so there are the following problems. That is, (1) Each slab is processed by a rough rolling mill group 2. It is necessary to smoothly engage the upper and lower rolls of finishing mill group 4, and it is necessary to adjust the tip shape and plate thickness of each slab. (2) The tip and rear ends of each slab should be As the temperature decreases, the product material becomes non-uniform.
(3)先行するスラブと後続するスラブとの間に、圧延
作業が宮なまれない空間が存在することになり、設備の
有効利用kが低く、生産能率も悪い。(3) A space exists between the preceding slab and the succeeding slab in which rolling operations cannot be performed, resulting in low effective utilization of equipment and poor production efficiency.
前記の非連続圧延を解決する手段として、スラブを走行
中に接合する連続EE延が提案された。As a means to solve the problem of discontinuous rolling, continuous EE rolling has been proposed in which slabs are joined while running.
熱間圧延の場合、通常スラブの厚みは250〜300謡
程度であり、これが、3〜4台の粗圧延機及び6〜7台
の仕上EE姑機によって製品厚へと圧延されるものであ
るが、いかなる厚みのものを、いかなる手段で走間接合
し、該接合部よりコイラーの直前に設置される走間シャ
ーまで、完全に連続化された圧延を実現するかは、検討
を要する重大な問題である。In the case of hot rolling, the thickness of the slab is usually about 250 to 300 mm, and this is rolled to the product thickness by 3 to 4 rough rolling mills and 6 to 7 finishing EE mills. However, it is important to consider how to join the materials of any thickness and by what means, and how to realize completely continuous rolling from the joint to the running shear installed just before the coiler. That's a problem.
即ち、厚いスラブ状態において、走間接合することは、
スラブのスピードが遅いので、この面からは作業が容易
であるが、逆に厚い状態のものをサイクルタイムとして
要求される短詩(約1分間)内に接合する手段そのもの
がない。In other words, running welding in a thick slab state is
Since the speed of the slab is slow, the work is easy from this point of view, but on the other hand, there is no means to join thick slabs within the required cycle time (about 1 minute).
又、数iの薄いス) IJツブ状態で走間接合すること
は、接合の面からは、容易になってくるが、走行スピー
ドが早くなり、機械の設計上及び接合部の走行距離の問
題からの技術的問題点が生じて来る。Also, while running welding in the IJ joint state is easier from a welding perspective, the running speed is faster, and there are problems with machine design and the running distance of the joint. Technical problems arise from this.
本兜明者等は、前記の諸問題につき検討を事ねた結果、
30〜40語厚(所謂シートバー)のスラブをフラッシ
ュバット瘉接法で接合することが、接合技術、走行スピ
ード、走行距離等諸観点から最適であるという結論に達
した。この場合、走行スピードは約t00m/m、走行
時間は各種設置も含めて約1分、L7たがって。After considering the above-mentioned issues, the present Kabuto Meisho et al.
It was concluded that joining slabs with a thickness of 30 to 40 words (so-called sheet bars) using the flash butt welding method is optimal from various viewpoints such as joining technology, running speed, and running distance. In this case, the running speed is about t00m/m, and the running time is about 1 minute, including various installations, so L7.
前記周辺技術を省みつつ、現在の一般的な熱間圧延ライ
ンの機器配置を考えると、シートバーのオンライン接合
機は最終粗圧延機と第1段仕上圧延機との間に設置され
るのが望ましい。Considering the equipment layout of the current general hot rolling line while taking into account the above-mentioned peripheral technology, it is assumed that the online joining machine for sheet bars is installed between the final rough rolling mill and the first stage finishing mill. is desirable.
しかしながら、フラッシュバット溶接にてシートバーを
突合せて溶接する場合に、シートバーを搬送するだめの
搬送テーブルとの干渉が一番の問題となる。即ち、フラ
ッシュバット溶接は第2図に示すように、シートバー6
.6′の端部を上下のクランプ兼用電極7.8で夫々挾
持し、夫々に電流を流してフラッシュ火花9を発生させ
、両シートバー6.6′ヲ夫々A、B方向に押し付けて
接合するものである。それ故、下クランプ兼用電極8が
搬送テーブル3のローラと干渉することになる@
前記ローラとの干渉を解決する手段として、本件特許出
願人は、ローラを揺動又は上下往復動可能にしたものを
提案した。し7がしながら。However, when the sheet bars are butt-welded using flash butt welding, interference with the conveying table that is used to convey the sheet bars becomes the biggest problem. That is, in flash butt welding, as shown in FIG.
.. The ends of the sheet bars 6.6' are clamped by the upper and lower clamp electrodes 7.8, and a current is applied to each to generate flash sparks 9, and both sheet bars 6.6' are pressed in the directions A and B to join them. It is something. Therefore, the lower clamp electrode 8 will interfere with the roller of the conveyance table 3. As a means to solve the interference with the roller, the applicant of this patent proposed a roller that can swing or move up and down. proposed. While I was there.
この手段は、約10.0mに亘るローラーテーブル(ピ
ッチ1mとすれば約100本)を可動式とすることは設
備費上の問題が残っている。In this method, there remains a problem in terms of equipment cost since the roller table (approximately 100 if the pitch is 1 m) is movable over a length of about 10.0 m.
そこで1本発明者等はローラを可動させずに固W式にす
べく種々研究を重ねた結果、走間接合機をテーブルロー
ラ上を移動させるように構成し、シートバーを上昇させ
て走間接合機に送ることにより好結果が得られることを
見出し、本発明と[2て提案したものである。Therefore, the inventors of the present invention have conducted various studies to create a fixed W type without moving the rollers, and as a result, they have constructed a running welding machine to move on table rollers, and raised the sheet bar to create a fixed W type. It was discovered that good results could be obtained by sending the wafer at multiple times, and the present invention and [2] were proposed.
本発明の構成を第3図以下、に示す実施例に基き詳細に
説明すると、接合機本体1oは第4゜5図に示すように
、シートバー6と平行する側壁に、夫々2本の支持腕1
1,11.11’、11’を水平に突出させ、走行車輪
12.−−一を回転自在に設けている。一方、テーブル
ローラ3のギヤボックス13及び軸受14の外側にレー
ル用架台15 、157をテーブルローラ5よリモ普く
設置し、夫々レール16 、167を固定して前記走行
車輪12.−−一を乗架して図示を省略した駆動機構に
より走行できるようになっている。The structure of the present invention will be explained in detail based on the embodiments shown in FIGS. 3 and below. As shown in FIGS. arm 1
1, 11. 11', 11' project horizontally, and the running wheels 12. --1 is rotatably provided. On the other hand, rail frames 15 and 157 are installed on the outside of the gear box 13 and bearing 14 of the table roller 3, and the rails 16 and 167 are fixed thereon, respectively. --1 can be mounted on the vehicle and run by a drive mechanism (not shown).
接合機本体10の内部には第3図に示すように、排出側
に接合ユニッ)15i[d定し、導入側に接合二二ツ)
15’((シートバー6の進行方向に沿って移動でき
るように設置する。両接合ユニツ)15.15’の上面
には夫々支片16゜16′ヲ突設し、一方の支片16に
接合用シリンダー17を枢着し、他方の支片16/にロ
ッド18を枢着して接合ユニット15′を移′IJIh
キせるようになっている。又、両接合ユニソ)15.j
5/の内部には夫々シートパー6を支持移動きせる上下
一対の駆動源(図示省略)と連結した挟圧ローラ19.
−−.−,19/、−−一を複数個設置し、接合ユニッ
ト15においては導入側に、接合ユニット15′におい
ては排出側に夫々下クランプ兼用を極20 、20’を
底面に置屋し、対向位置に上クランプ兼用電極21,2
17i昇降自在に設け、接合機本体1oの天板に固定し
た電源22にコード25 、23’で接続されている・
又、接合機本体1oの導入側側壁には両端部に夫々支片
24,24’を固定して作動@25を回動自在に支持し
ている。この作動l1qI]25には支片26 、26
’を介して導入ガイド部材27を固定しており1作動+
11125の軸端にはり、ンク28の一端を固足し、こ
のリンク28の他端を接合機本体10に支片29を介し
て枢着したガイド用流体機構30に枢着し、ガイド用流
体機構30の駆動により作動軸25を介して導入ガイド
部材27を振動させるように々っている。As shown in Fig. 3, inside the welding machine body 10, there is a welding unit (15i) on the discharge side and a welding unit (22i) on the inlet side.
15' ((installed so that it can move along the direction of movement of the seat bar 6. both joint units) 15. On the upper surface of 15', branch pieces 16° and 16' are respectively protruded, and one branch piece 16 has a The joining cylinder 17 is pivotally attached, the rod 18 is pivotally attached to the other branch 16/, and the joining unit 15' is moved.
It is now possible to press. Also, both junctions Uniso) 15. j
Inside the rollers 5/, there are pressure rollers 19 connected to a pair of upper and lower drive sources (not shown) that support and move the sheet pars 6, respectively.
---. -, 19/, ---1 are installed on the inlet side of the joining unit 15 and on the discharge side of the joining unit 15'. upper clamp electrodes 21, 2
17i is installed so that it can be raised and lowered freely, and is connected by cords 25 and 23' to a power supply 22 fixed to the top plate of the welding machine main body 1o.
Further, on the introduction side side wall of the welding machine main body 1o, support pieces 24 and 24' are fixed at both ends, respectively, to rotatably support the actuator @25. This operation l1qI]25 has branches 26, 26
'The introduction guide member 27 is fixed through 1 operation +
11125, one end of the link 28 is fixed, and the other end of this link 28 is pivotally connected to the guide fluid mechanism 30 which is pivotally connected to the welding machine main body 10 via the support piece 29. 30 vibrates the introduction guide member 27 via the operating shaft 25.
導入ガイド部材27は第5,4図に示すように、高さ方
向における中央に導入溝27aを設け、下ガイド板27
t+に複数個の下ピンチロール31.−−一を導入溝2
7aとはソ同一平面になるように取付ける。父、上ガイ
ド板27cには電導入側の下ピンチロール31と対向す
る位置に窓27(lを設けて上ピンチロール52を嵌入
している。この上ピンチロール62は上ガイド板27c
の内側に固定したビンチロールノ・ウジング35 、3
5’に固定した圧下シリンダ34に取付けた圧下ブロッ
ク35で昇降できるようになっている。又、上ピンチロ
ール32の一端には鎖車36を軸着し、接合機本体10
の天板に設置したモータ37に取付けた鎖車38とに鎖
帯39を掛け、駆動できるようになっている。As shown in FIGS. 5 and 4, the introduction guide member 27 has an introduction groove 27a in the center in the height direction, and the lower guide plate 27
Multiple lower pinch rolls 31. on t+. --Introduce groove 2
Install it so that it is on the same plane as 7a. The upper guide plate 27c is provided with a window 27 (l) at a position opposite to the lower pinch roll 31 on the power introduction side, and the upper pinch roll 52 is fitted therein.
Bintirollno Uzing 35, 3 fixed inside the
It can be raised and lowered by a lowering block 35 attached to a lowering cylinder 34 fixed at 5'. Further, a chain wheel 36 is pivotally attached to one end of the upper pinch roll 32, and the welding machine main body 10
A chain belt 39 is attached to a chain wheel 38 attached to a motor 37 installed on the top plate of the machine, so that it can be driven.
又、接合機本体10の排出側側壁には排出溝40を傾斜
状態で形成するように上下にガイド板41.42を固定
して排出ガイド部材43を形成している。Furthermore, a discharge guide member 43 is formed on the discharge side wall of the welding machine main body 10 by fixing guide plates 41 and 42 on the upper and lower sides so as to form the discharge groove 40 in an inclined state.
尚1図面では省略したが接合機本体10及び両接合ユニ
ツ) 15 、15’の側壁にはシートパー6が通過で
きるように溝が設けられている。Although not shown in the first drawing, grooves are provided in the side walls of the welding machine main body 10 and the welding units (15, 15') so that the sheet pars 6 can pass therethrough.
本実施例は前記のように構成したもので、ガイド用流体
機構30により導入ガイド部材27を第5図に示すよう
に傾斜させ、下ガイド板27blテーブルローラ3の上
面に位置するようにする。そして、両側の上クランプ兼
用電極21゜21′は共に上昇位置にある。This embodiment is constructed as described above, and the introduction guide member 27 is tilted by the guide fluid mechanism 30 as shown in FIG. 5, so that the lower guide plate 27bl is positioned on the upper surface of the table roller 3. The upper clamp electrodes 21 and 21' on both sides are both in the raised position.
前記の状態で先行シートバー6の粗圧延を行うと、シー
トバー6は導入ガイド部材27の導入溝27aから導入
され、上下ピンチロール52゜31により移動し、両接
合ユニット15 、15’の挟圧ローラ19.−−−,
19/、−−一を介して排出ガイド部材43の排出溝4
0から排出し、テーブルローラ3により仕上圧延機群4
に送られる。そして、先行シートパー6の後端部が接合
ユニット15の後端近傍に位置した時に、上クランプ兼
用電極21を下降させて、下クランプ兼用電極20とで
挾持する〔第6図(イ)参照〕。この状態において接合
機本体10は先行シートバー6と共にレール16 、1
6’上を仕上圧延機群4の方向に移動する。この時、後
続シートパー6′は粗圧延機群2で圧延されており、粗
圧砒機群2のワークロール(図示省略)のスピードを増
速しで接合機本体10に追付かせる。When the preceding sheet bar 6 is roughly rolled in the above-mentioned state, the sheet bar 6 is introduced from the introduction groove 27a of the introduction guide member 27, moved by the upper and lower pinch rolls 52°31, and rolled between both joining units 15 and 15'. Pressure roller 19. ---,
19/, -- the discharge groove 4 of the discharge guide member 43 via the
0 and finished rolling mill group 4 by table roller 3.
sent to. Then, when the rear end of the preceding sheet par 6 is located near the rear end of the joining unit 15, the upper clamp electrode 21 is lowered and clamped with the lower clamp electrode 20 [see FIG. 6 (a)]. . In this state, the welding machine main body 10 is connected to the rails 16 and 1 together with the preceding sheet bar 6.
6' in the direction of finishing rolling mill group 4. At this time, the subsequent sheet par 6' is being rolled by the rough rolling mill group 2, and the speed of the work rolls (not shown) of the rough rolling mill group 2 is increased to catch up with the joining machine main body 10.
この増速により、後続シートパー6′は先行ノートパー
6と同様に導入ガイド部材27を介して接合ユニット1
5′に導かれる。そして、先端が接合ユニット15′か
ら出た時に上クランプ兼用電極21′を下降させ、下ク
ランプ兼用電極20′とで挾持する。その後、接合用シ
リンダ17を駆動して接合ユニット15′を移動して両
シートバー6・6′の間隔を所冗寸法(300鴎厚の7
−トバーにおいては約10m18程匿)にセットし、電
源22から電流を供給してフラッシュバット溶接を行う
。Due to this speed increase, the succeeding sheet par 6' passes through the joining unit 1 through the introduction guide member 27 in the same way as the preceding note par 6.
5'. Then, when the tip comes out from the joining unit 15', the upper clamp electrode 21' is lowered and is clamped with the lower clamp electrode 20'. Thereafter, the joining cylinder 17 is driven to move the joining unit 15' and adjust the distance between the two seat bars 6 and 6' to an extra dimension (7 mm with a thickness of 300 mm).
- set to about 10m18 (at a distance of about 18m) at the top, and flash butt welding is performed by supplying current from the power source 22.
溶接後は雨上クランプ兼用電極21 、21’を夫々上
昇させてシートバー6.6′を開放し、上ピンチロール
32も上昇させ、接合機本体1゜を元位置に戻す。After welding, the rain clamp electrodes 21 and 21' are respectively raised to open the seat bar 6.6', the upper pinch roll 32 is also raised, and the welding machine body is returned to its original position by 1°.
本発明は前記のような構成作用を有するもので、接合機
本体10はテーブルローラ3の上方を移動するようにな
っているので、テーブルローラ3は従来のように昇降さ
せる必要がなく。The present invention has the above-mentioned configuration and function, and since the welding machine main body 10 moves above the table roller 3, there is no need to raise and lower the table roller 3 as in the conventional case.
固定式のものを用いることができ、設備費が安価となり
、故障が起りにくい。A fixed type can be used, equipment costs are low, and breakdowns are less likely to occur.
又、接合機本体10の導入側には導入ガイド部材27を
傾斜させて設けているので、シートバー6をテーブルロ
ーラ3がら円滑に導入することができる。Further, since the introduction guide member 27 is provided at an angle on the introduction side of the welding machine main body 10, the sheet bar 6 can be introduced smoothly along with the table rollers 3.
第1図は従来の熱間圧延ラインを示す配置図。
第2図はフラッシュバット溶接の要部を示す側面図、第
5図は本発明に係る熱間圧延材オンラーイン接合装置の
一実施例を示す縦断側面図、第4図はその平面図、第5
図は背面図、第6図は接合作業順序の概略図を夫々示す
。
尚1図中2は粗圧延機群、5はテーブルローラ、4は仕
上圧延機群、10は接合機本体、15゜15′は接合ユ
ニツ)、20.20’は下クランプ兼用電極、21.2
1’は上クランプ兼用電極。
27は導入ガイド部材である。
%吐出願人 川崎候鉄株式会社
第1図
第2図FIG. 1 is a layout diagram showing a conventional hot rolling line. FIG. 2 is a side view showing the main parts of flash butt welding, FIG.
The figure shows a rear view, and FIG. 6 shows a schematic diagram of the joining operation sequence. In Figure 1, 2 is a rough rolling mill group, 5 is a table roller, 4 is a finishing rolling mill group, 10 is a welding machine main body, 15°15' is a welding unit), 20.20' is a lower clamp electrode, 21. 2
1' is the electrode that also serves as the upper clamp. 27 is an introduction guide member. Applicant: Kawasaki Kuutetsu Co., Ltd. Figure 1 Figure 2
Claims (1)
の上方に、上下クラスプ兼用電極を有する2個の接合ユ
ニットを内蔵し、導入側に傾斜した導入ガイド部材を設
けた接合機本体を走行自在に設置したことを特徴とする
熱間圧延材のオンライン接合装#、aAbove the table rollers installed between the rough rolling mill group and the finishing rolling mill group, there are two built-in joining units with electrodes that can be used for both upper and lower clasps, and the joining machine body runs on the main body of the joining machine, which is equipped with an introduction guide member that is slanted toward the introduction side. Online joining equipment for hot rolled materials #, a characterized by being freely installed
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3404882A JPS58151971A (en) | 1982-03-05 | 1982-03-05 | On-line jointing device for hot-rolled material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3404882A JPS58151971A (en) | 1982-03-05 | 1982-03-05 | On-line jointing device for hot-rolled material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58151971A true JPS58151971A (en) | 1983-09-09 |
Family
ID=12403411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3404882A Pending JPS58151971A (en) | 1982-03-05 | 1982-03-05 | On-line jointing device for hot-rolled material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58151971A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61182877A (en) * | 1985-02-08 | 1986-08-15 | Mitsubishi Heavy Ind Ltd | Sheet bar running joining device |
US6296428B1 (en) | 1998-11-24 | 2001-10-02 | Nkk Corporation | Burr removing method and apparatus |
-
1982
- 1982-03-05 JP JP3404882A patent/JPS58151971A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61182877A (en) * | 1985-02-08 | 1986-08-15 | Mitsubishi Heavy Ind Ltd | Sheet bar running joining device |
US6296428B1 (en) | 1998-11-24 | 2001-10-02 | Nkk Corporation | Burr removing method and apparatus |
US6402441B2 (en) | 1998-11-24 | 2002-06-11 | Nkk Corporation | Burr removing method and apparatus |
US6648564B2 (en) | 1998-11-24 | 2003-11-18 | Nkk Corporation | Burr removing method and apparatus |
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