JP2008221267A - Plug bar center detecting apparatus for seamless steel tube - Google Patents

Plug bar center detecting apparatus for seamless steel tube Download PDF

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JP2008221267A
JP2008221267A JP2007061151A JP2007061151A JP2008221267A JP 2008221267 A JP2008221267 A JP 2008221267A JP 2007061151 A JP2007061151 A JP 2007061151A JP 2007061151 A JP2007061151 A JP 2007061151A JP 2008221267 A JP2008221267 A JP 2008221267A
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plug bar
plug
bar
axial center
tip
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JP4893384B2 (en
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Tomomitsu Kimura
智充 木村
Kenji Yokomakura
憲次 横枕
Shigeru Isoyama
茂 磯山
Kotaro Fujisawa
宏太郎 藤澤
Tsugio Makino
二男 牧野
Motohito Shiozumi
元仁 塩住
Yoshiki Fukutaka
善己 福高
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a detecting apparatus capable of detecting an axial center near the front end of a plug bar with satisfactory accuracy and simplicity even when the axial center bends in both of a Y direction and an X direction with respect to a reference axis (Z). <P>SOLUTION: The detecting apparatus includes a pair of cylinders which are arranged to face each other across the axial center of the plug bar at least at two points in the longitudinal direction of the plug bar, distance sensors which measure the movement before the rod of each cylinder bar abuts on the peripheral edge of the plug bar, and an operational equipment which calculates the angle of inclination of the axial center near the front end of the plug bar based on the signal of movement from the distance sensor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、継目無鋼管の製造に用いる圧延工具のプラグを交換する際、プラグバーの先端部近傍の軸心を検出する検出装置に関する。   The present invention relates to a detection device that detects an axial center in the vicinity of a tip portion of a plug bar when a plug of a rolling tool used for manufacturing a seamless steel pipe is replaced.

継目無鋼管の製造工程では、鋼管素材を穿孔圧延して中空素管とするピアサーミル、それで得られる中空素管を圧延しその肉厚を薄くするプラグミル、さらにそれで得られる素管の肉厚を均一にするリーラミルにおいて、圧延工具としてプラグおよびそれを支えるプラグバーが使用される。その際、プラグバーの方はある程度曲がりが生じた状態でも繰り返し用いられ、一方、プラグの方は製造上、製品品質に大きい影響を与えるため、劣化プラグを新品プラグと交換する交換作業が頻繁に実行される。   In the seamless steel pipe manufacturing process, a piercer mill that pierces and rolls steel pipe material into a hollow shell, a plug mill that rolls the resulting hollow shell to reduce its thickness, and the thickness of the resulting blank is uniform. In a reel mill, a plug and a plug bar that supports the plug are used as rolling tools. At that time, the plug bar is repeatedly used even if it is bent to some extent, while the plug has a great influence on the product quality in manufacturing, so replacement work for replacing a deteriorated plug with a new one is frequent. Executed.

この重量のあるプラグの交換作業を容易に行う自動着脱装置が普通、製造ラインに配置されている（特許文献１）。
特開平９−２３４５０４号公報 An automatic attachment / detachment device that facilitates the replacement work of the heavy plug is usually arranged on a production line (Patent Document 1).
JP-A-9-234504

しかし、特許文献１の着脱装置は、両者の芯ずれを機械的な力やサーボモータのトルク等により検知し、芯合わせする自動調芯機能を有しているものの、プラグバーの先端部近傍の軸心を検出するようにしていない。したがって、着脱装置のクランプでプラグを把持し、回転させながら、曲がりのないプラグバーの軸心にプラグの軸心を一致させ、接近または離隔させてプラグを着脱した場合、プラグバーの先端部近傍の曲がりが、たとえば１ｍで５〜１０ｍｍともなると、支障を来たすことがあった。すなわち、プラグをクランプで把持し、回転させてプラグを装着する際、あらかじめプラグの軸心の傾斜を、プラグバー先端の傾斜に合わせておかないと、プラグ側のねじと、プラグバー１の先端に設けたねじ金物２のねじ（バー側のねじという）との螺合工程で「かじり」が生じ、プラグの交換作業が失敗してしまうことがあった。なお図５には、プラグバーの先端部近傍に生じた曲がりを拡大して示した。つまり、実線で示す曲がりのないプラグバー１の場合、プラグ３の軸心の傾斜を基準のＺ軸に合わせ、また曲がりのあるプラグバーの場合、その傾斜をあらかじめ求めておき、求めた傾斜にプラグ３の軸心の傾斜を合わせる必要がある。   However, although the attachment / detachment device of Patent Document 1 has an automatic alignment function that detects the misalignment between the two by a mechanical force, a torque of a servo motor, or the like and aligns the center, The axis is not detected. Therefore, when the plug is attached / detached by gripping and rotating the plug with the clamp of the attaching / detaching device, aligning the axis of the plug with the axis of the plug bar without bending and approaching or separating it, the vicinity of the tip of the plug bar For example, when the bend is 1 to 5 to 10 mm, it may cause trouble. That is, when the plug is gripped with a clamp and rotated to mount the plug, the plug axis and the tip of the plug bar 1 must be adjusted in advance unless the inclination of the axis of the plug is adjusted to the inclination of the tip of the plug bar. In the screwing process with the screw (referred to as the bar-side screw) of the screw metal object 2 provided on the plug, there has been a case where the plug replacement operation fails. FIG. 5 shows an enlarged view of the bend that occurs near the tip of the plug bar. That is, in the case of the plug bar 1 without a bend indicated by the solid line, the inclination of the axis of the plug 3 is aligned with the reference Z axis, and in the case of a plug bar with a bend, the inclination is obtained in advance, and the obtained inclination is obtained. It is necessary to match the inclination of the axis of the plug 3.

普通、基準のＺ軸（曲がりのないプラグバー１の軸心１Ａ）に対し、プラグバーの先端部近傍の軸心１Ａがどの程度傾いているのかを検出するには、人手によって距離センサー等を用い、たとえばプラグバー長手方向の少なくとも２箇所で、Ｚ軸からプラグバー下面までのＹ方向距離を測定すれば、Ｙ方向にのみ曲がっているプラグバー１に対してはその傾斜角を以下で計算できる。   Usually, in order to detect how much the axis 1A near the tip of the plug bar is inclined with respect to the reference Z-axis (the axis 1A of the plug bar 1 without bending), a distance sensor or the like is manually used. For example, if the distance in the Y direction from the Z axis to the lower surface of the plug bar is measured at at least two points in the longitudinal direction of the plug bar, the inclination angle of the plug bar 1 bent only in the Y direction is calculated as follows: it can.

Ｙ方向への傾斜角＝（2箇所でのＹ方向距離の差）／Ｌ
ただし、Ｌ：プラグバー長手方向の２箇所での距離の差
だが、それだけでは、プラグバーの先端部近傍がＸ方向に曲がっている場合、その軸心を検出できず、その方向への傾斜角を求めることができないという問題があった。
また、プラグバー１の先端部近傍の軸心１ＡがＹ方向およびＸ方向へ曲がっていると、人手によって距離センサーを用い、その軸心を精度よく検出するには時間がかかり、また人手もいるという、問題があった。 Inclination angle in Y direction = (difference in Y direction distance at two locations) / L
However, L is the difference in the distance between the two locations in the longitudinal direction of the plug bar. However, if that is the only point, if the vicinity of the tip of the plug bar is bent in the X direction, its axis cannot be detected, and the inclination angle in that direction There was a problem that could not be asked.
Further, when the axis 1A near the tip of the plug bar 1 is bent in the Y direction and the X direction, it takes time to detect the axis accurately by using a distance sensor by hand, and there are also human hands. There was a problem.

本発明は、上記従来技術の問題点を解消し、基準軸（Ｚ軸）に対してプラグバーの先端部近傍の軸心がＹ方向およびＸ方向の両方へ曲がっている場合でもその軸心を精度よく簡便に検出することが可能な検出装置を提供することを目的とする。   The present invention solves the above-mentioned problems of the prior art, and even when the axis near the tip of the plug bar is bent in both the Y direction and the X direction with respect to the reference axis (Z axis), It is an object of the present invention to provide a detection device capable of detecting accurately and simply.

本発明は、以下のとおりである。
１．基準軸に対してプラグバーの先端部近傍の軸心を検出する検出装置であって、プラグバー長手方向の少なくとも２箇所にプラグバーの軸心を挟んで対向配置された一対のシリンダーと、それぞれのシリンダーのロッドが前記プラグバーの周縁に当接するまでの移動量を測定する距離センサーと、該距離センサーからの移動量の信号に基づいて前記プラグバーの先端部近傍の軸心の傾斜角を算出する演算装置と、を具備してなることを特徴とする継目無鋼管用プラグバー中心検出装置。 The present invention is as follows.
1. A detection device that detects an axial center in the vicinity of the tip of the plug bar with respect to a reference axis, and a pair of cylinders disposed opposite to each other with the axial center of the plug bar interposed between at least two locations in the longitudinal direction of the plug bar, A distance sensor for measuring the amount of movement until the rod of the cylinder contacts the peripheral edge of the plug bar, and the inclination angle of the shaft center near the tip of the plug bar based on a signal of the amount of movement from the distance sensor. An arithmetic device for calculation, comprising: a plug bar center detection device for seamless steel pipes.

２．前記演算装置は、プラグバー長手方向の少なくとも２箇所に対向配置された一対のシリンダーのロッドを、曲がりのないプラグバーに当接させたときの位置を基準位置として記憶する記憶部を有することを特徴とする１．に記載の継目無鋼管用プラグバー中心検出装置。   2. The arithmetic unit has a storage unit that stores, as a reference position, a position when a rod of a pair of cylinders opposed to each other in at least two positions in the longitudinal direction of the plug bar is brought into contact with a plug bar without bending. Features 1 The plug bar center detection device for seamless steel pipes described in 1.

本発明によれば、プラグを交換する際に、基準となるＺ軸に対してプラグバーの先端部近傍の軸心がＹ方向およびＸ方向の両方へ曲がっている場合でもプラグバーの軸心を精度よく簡便に検出することができる。
したがって、たとえばロボットアームに取り付けた着脱装置のクランプ爪でプラグを把持し、回転させながら、プラグバーに対して接近または離隔させてプラグを着脱するとき、プラグバーの曲がり量を考慮することで、プラグを着脱する工程のプラグ側のねじとバー側のねじと螺合させる螺合工程で「かじり」が生じることを抑制できる According to the present invention, when replacing the plug, the axis of the plug bar can be adjusted even when the axis near the tip of the plug bar is bent in both the Y direction and the X direction with respect to the reference Z axis. It can be detected easily with high accuracy.
Therefore, for example, when the plug is attached to or detached from the plug bar while moving it close to or away from the plug bar while holding the plug with the clamping claw of the attaching / detaching device attached to the robot arm and rotating, It is possible to suppress the occurrence of “galling” in the screwing process in which the screw on the plug side and the screw on the bar side are screwed in the process of attaching and detaching the plug.

まず、図1を用い、プラグバー中心検出装置について説明する。図１（ａ）は、ピアサーミル用のプラグバー中心検出装置の構成を示す正面図、図１（ｂ）はその側面図である。プラグバー１の先端部近傍の軸心１Ａの基準は、プラグバー１に曲がりがない場合の軸心１Ａとし、それをＺ軸とした。
ここで、L０は最も先端側に配置した一対のシリンダー４と、プラグバー先端との間のＺ方向距離を示し、Lは、プラグバー長手方向に配置したシリンダー４間のＺ方向距離を示す。一般的にL０は１００〜２００ｍｍ、Lは３００〜４００ｍｍとすることができる。 First, the plug bar center detection device will be described with reference to FIG. FIG. 1A is a front view showing a configuration of a plug bar center detecting device for a piercer mill, and FIG. 1B is a side view thereof. The reference for the axis 1A near the tip of the plug bar 1 is the axis 1A when the plug bar 1 is not bent, and this is the Z axis.
Here, L 0 indicates the Z-direction distance between the pair of cylinders 4 arranged at the most distal end side and the plug bar tip, and L indicates the Z-direction distance between the cylinders 4 arranged in the plug bar longitudinal direction. . In general, L 0 can be 100 to 200 mm, and L can be 300 to 400 mm.

この場合、プラグバー１の先端部近傍の軸心１Ａを検出する検出装置として、プラグバー長手方向の3箇所にプラグバー１の軸心１Ａを挟んで一対のリニアスケール付きシリンダー４を対向配置した。リニアスケール付きシリンダー４によれば、そのロッド４Ａがプラグバー１の周縁に当接するまでの移動量を正確に測定することが可能となる。５、６は、距離センサーであるリニアスケールから出力される移動量の信号を示す。ただし、図1には、リニアスケールからの移動量の信号５、６に基づいて、プラグバー１の先端部近傍の軸心１Ａの傾斜角を算出する演算装置の図示を省略した。   In this case, as a detection device for detecting the axial center 1A in the vicinity of the tip end portion of the plug bar 1, a pair of cylinders with linear scales 4 are arranged opposite to each other with the axial center 1A of the plug bar 1 in three locations in the longitudinal direction of the plug bar. . According to the cylinder 4 with a linear scale, it is possible to accurately measure the amount of movement until the rod 4A comes into contact with the peripheral edge of the plug bar 1. Reference numerals 5 and 6 denote movement amount signals output from a linear scale which is a distance sensor. However, in FIG. 1, an arithmetic unit that calculates the inclination angle of the axis 1 </ b> A in the vicinity of the tip of the plug bar 1 based on the movement amount signals 5 and 6 from the linear scale is omitted.

この例ではプラグバー長手方向の3箇所に一対のシリンダー４を対向配置したが、本発明では、プラグバー長手方向の少なくとも２箇所に一対のシリンダー４を対向配置することで、演算装置により後述するようにして、プラグバー１の先端部近傍の軸心１Ａの傾斜角α、βを算出することができる（図３、４参照）。
以上説明したように、本発明のプラグバー中心検出装置は、プラグバー長手方向の少なくとも２箇所にプラグバー１の軸心１Ａを挟んで対向配置された一対のシリンダー４と、それぞれのシリンダー４のロッド４Ａがプラグバー１の周縁に当接するまでの移動量を測定する距離センサー（この例ではリニアスケール）と、距離センサーからの移動量の信号５、６に基づいて先端部近傍の軸心の傾斜角を算出する演算装置と、を具備してなる。 In this example, a pair of cylinders 4 are arranged opposite to each other at three locations in the plug bar longitudinal direction. However, in the present invention, a pair of cylinders 4 are arranged opposite to each other in at least two locations in the plug bar longitudinal direction. In this way, the inclination angles α and β of the shaft center 1A in the vicinity of the tip of the plug bar 1 can be calculated (see FIGS. 3 and 4).
As described above, the plug bar center detecting device according to the present invention includes a pair of cylinders 4 arranged opposite to each other with the axis 1A of the plug bar 1 in between at least two places in the plug bar longitudinal direction, A distance sensor (in this example, a linear scale) that measures the amount of movement until the rod 4A comes into contact with the peripheral edge of the plug bar 1, and a shaft center near the tip based on the movement signals 5 and 6 from the distance sensor. And an arithmetic unit that calculates an inclination angle.

この演算装置は、曲がりのないプラグバー１に、プラグバー長手方向の少なくとも２箇所に対向配置された一対のシリンダー４のロッド４Ａを当接させたとき、距離センサーから出力される移動量の信号をロッド基準位置として記憶する記憶部を有することが、プラグバー１の先端部近傍の軸心１Ａを精度よく簡便に検出することができるので好ましい。
図２を用い、上述した本発明のプラグバー中心検出装置の検出原理を説明する。10は曲がりのないプラグバー断面の外縁を示し、20は曲がりのあるプラグバー断面の外縁をそれぞれ示す。ＯおよびＰは、円形の外縁10、20の中心である。 When the rod 4A of a pair of cylinders 4 arranged opposite to the plug bar 1 in the longitudinal direction of the plug bar is brought into contact with the plug bar 1 having no bending, the arithmetic unit outputs a movement amount signal output from the distance sensor. Is preferably stored as the rod reference position, since the axial center 1A in the vicinity of the tip of the plug bar 1 can be detected accurately and simply.
The detection principle of the above-described plug bar center detection device of the present invention will be described with reference to FIG. Reference numeral 10 denotes an outer edge of an unbent plug bar section, and reference numeral 20 denotes an outer edge of a bent plug bar section. O and P are the centers of the circular outer edges 10,20.

この図２で、左下のシリンダー４のロッド４Ａを曲がりのあるプラグバーの外縁20に当接させたときのロッド４Ａの移動量は、対向配置した右下のシリンダー４のロッド４Ａを同じ曲がりのあるプラグバーに当接させたときの移動量よりも大きい。つまり、曲がりのないプラグバー断面の外縁10にそれぞれのロッド４Ａを当接させたときのロッド位置を基準位置として記憶しておけば、対向配置された一対のシリンダー４のロッド４Ａを曲がりのあるプタグバーの外縁20に当接させることで、移動量の差が検出できる。この移動量の差を利用すれば、外縁10、20の形状が同じプラグバー１の外径であるという幾何学的な条件を考慮して、演算装置により曲がりのあるプラグバー１の外縁20の中心Ｐ（ΔＸ，ΔＹ）を決定することが容易にできる。また、同様にして、プラグバー長手方向の別な箇所に対向配置された一対のシリンダー４についても、そのロッド４Ａの移動量の差と幾何学的な条件とを考慮して、その箇所で曲がりのあるプラグバー１の断面の外縁の中心を決定することが容易にできる。   In FIG. 2, when the rod 4A of the lower left cylinder 4 is brought into contact with the outer edge 20 of the bent plug bar, the amount of movement of the rod 4A is the same as that of the rod 4A of the lower right cylinder 4 arranged oppositely. It is larger than the amount of movement when contacting a certain plug bar. That is, if the rod positions when the respective rods 4A are brought into contact with the outer edges 10 of the cross section of the plug bar without bending are stored as the reference positions, the rods 4A of the pair of cylinders 4 arranged to face each other are bent. By making contact with the outer edge 20 of the tag bar, the difference in the amount of movement can be detected. If the difference in the amount of movement is utilized, the geometrical condition that the outer edges 10 and 20 have the same outer diameter as the plug bar 1 is taken into consideration, and the outer edge 20 of the bent plug bar 1 is bent by the arithmetic unit. The center P (ΔX, ΔY) can be easily determined. Similarly, with respect to a pair of cylinders 4 arranged opposite to each other in the longitudinal direction of the plug bar, considering the difference in the amount of movement of the rod 4A and geometrical conditions, the cylinder 4 bends at that part. It is possible to easily determine the center of the outer edge of the cross section of the plug bar 1 having a gap.

したがって、ＰＱ間の平均的な傾斜角α、βを以下のようにして計算することができる。なお、図３、４にはその傾斜角α、βを図示した。
Ｙ方向への傾斜角α＝（2箇所でのＹ方向の軸心位置の差）／Ｌ
Ｘ方向への傾斜角β＝（2箇所でのＸ方向の軸心位置の差）／Ｌ
ここで、Ｌはプラグバー長手方向に配置したシリンダー４間のＺ方向距離。 Therefore, the average inclination angles α and β between the PQs can be calculated as follows. 3 and 4 show the inclination angles α and β.
Inclination angle α in the Y direction = (difference in axial center position in the Y direction at two locations) / L
Inclination angle β in the X direction = (difference in axial center position in the X direction at two locations) / L
Here, L is the distance in the Z direction between the cylinders 4 arranged in the longitudinal direction of the plug bar.

以上説明したことからわかるように、本発明の検出装置によれば、プラグバーを交換する際に、Ｚ軸に対してプラグバーの先端部近傍の軸心がＹ方向およびＸ方向の両方へ曲がっている場合でもその軸心を精度よく簡便に検出することができる。   As can be seen from the above description, according to the detection device of the present invention, when the plug bar is replaced, the axis near the tip of the plug bar is bent in both the Y direction and the X direction with respect to the Z axis. Even in such a case, the axis can be detected accurately and simply.

ピアサーミル用のプラグバー中心検出装置の構成を示す正面図（ａ）、側面図（ｂ）である。It is the front view (a) which shows the structure of the plug bar center detection apparatus for Piercer mill, and a side view (b). プラグバー中心検出装置による先端部近傍の軸心の検出原理を説明する特性図である。It is a characteristic view explaining the detection principle of the axial center of the front-end | tip part vicinity by a plug bar center detection apparatus. プラグバーの先端部近傍の軸心のＹ方向曲がり（傾斜角α）を示す特性図である。It is a characteristic view which shows the Y direction bending (inclination angle (alpha)) of the axial center of the front-end | tip part vicinity of a plug bar. プラグバーの先端部近傍の軸心のＸ方向曲がり（傾斜角β）を示す特性図である。It is a characteristic view which shows the X direction bending (inclination angle (beta)) of the axial center of the front-end | tip part vicinity of a plug bar. プラグバーの先端部近傍の曲がりを示す斜視図である。It is a perspective view which shows the curve of the front-end | tip part vicinity of a plug bar.

符号の説明Explanation of symbols

１ プラグバー
１Ａ 軸心
２ ねじ金物
３ プラグ
４ シリンダー
４Ａ ロッド
５、６ 移動量の信号
10 曲がりのないバー断面の外縁
20 曲がりのあるバー断面の外縁
L０、L Ｚ方向距離
Ｏ、Ｐ、Ｑ 点
α、β 傾斜角 1 Plug bar 1A Axle 2 Screw metal 3 Plug 4 Cylinder 4A Rod 5, 6 Travel distance signal
10 Outer edge of uncurved bar section
20 Outer edge of curved bar section
L 0 , L Z direction distance O, P, Q point α, β Inclination angle

Claims (2)

基準軸に対してプラグバーの先端部近傍の軸心を検出する検出装置であって、プラグバー長手方向の少なくとも２箇所にプラグバーの軸心を挟んで対向配置された一対のシリンダーと、それぞれのシリンダーのロッドが前記プラグバーの周縁に当接するまでの移動量を測定する距離センサーと、該距離センサーからの移動量の信号に基づいて前記プラグバーの先端部近傍の軸心の傾斜角を算出する演算装置と、を具備してなることを特徴とする継目無鋼管用プラグバー中心検出装置。   A detection device that detects an axial center in the vicinity of the tip of the plug bar with respect to a reference axis, and a pair of cylinders disposed opposite to each other with the axial center of the plug bar interposed between at least two locations in the longitudinal direction of the plug bar, A distance sensor for measuring the amount of movement until the rod of the cylinder contacts the peripheral edge of the plug bar, and the inclination angle of the shaft center near the tip of the plug bar based on a signal of the amount of movement from the distance sensor. An arithmetic device for calculation, comprising: a plug bar center detecting device for seamless steel pipes. 前記演算装置は、プラグバー長手方向の少なくとも２箇所に対向配置された一対のシリンダーのロッドを、曲がりのないプラグバーに当接させたときの位置を基準位置として記憶する記憶部を有することを特徴とする請求項１に記載の継目無鋼管用プラグバー中心検出装置。   The arithmetic unit has a storage unit that stores, as a reference position, a position when a rod of a pair of cylinders opposed to each other in at least two positions in the longitudinal direction of the plug bar is brought into contact with a plug bar without bending. The plug bar center detecting device for a seamless steel pipe according to claim 1,
JP2007061151A 2007-03-12 2007-03-12 Plug bar center detector for seamless steel pipes Active JP4893384B2 (en)

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DE102009035184A1 (en) 2008-08-29 2010-03-04 Koito Mfg. Co., Ltd. Dimming control system for a vehicle lamp

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JPS55165207A (en) * 1979-06-11 1980-12-23 Nippon Steel Corp Detecting method for plug in pipe forming mill
JPS5686608A (en) * 1979-12-17 1981-07-14 Mitsubishi Heavy Ind Ltd Plug interchanger
JPS5850407A (en) * 1981-09-21 1983-03-24 Nippon Kokan Kk <Nkk> Device for measuring bending of tube body end part
JPS58202909A (en) * 1982-05-20 1983-11-26 Kawasaki Steel Corp Plug bar for manufacturing seamless steel pipe
JPS61182602A (en) * 1985-02-07 1986-08-15 Audio Technica Corp Pickup for record player
JPH0318901A (en) * 1989-06-15 1991-01-28 Mitsubishi Heavy Ind Ltd Optimum load distributing device
JPH05269520A (en) * 1992-03-25 1993-10-19 Sumitomo Metal Ind Ltd Method for measuring eccentricity of horizontal extrusion press and core-measuring jig used therefor
JPH0796305A (en) * 1993-09-29 1995-04-11 Kawasaki Steel Corp Plug bar for producing seamless steel pipe
JPH09234504A (en) * 1996-02-29 1997-09-09 Kawasaki Steel Corp Method and equipment for attaching/detaching drilled plug
JPH11123413A (en) * 1997-10-15 1999-05-11 Sumitomo Metal Ind Ltd Device for changing mandrel and plug of piercing mill and changing method therefor
JPH11169916A (en) * 1997-12-12 1999-06-29 Sumitomo Metal Ind Ltd Device for attaching and detaching piercer plug
JP2001246404A (en) * 2000-03-03 2001-09-11 Sumitomo Metal Ind Ltd Method for operating insertion of mandrel bar

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009035184A1 (en) 2008-08-29 2010-03-04 Koito Mfg. Co., Ltd. Dimming control system for a vehicle lamp

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