JP6771420B2 - Automatic identification management method for each steel pipe - Google Patents

Automatic identification management method for each steel pipe Download PDF

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JP6771420B2
JP6771420B2 JP2017082813A JP2017082813A JP6771420B2 JP 6771420 B2 JP6771420 B2 JP 6771420B2 JP 2017082813 A JP2017082813 A JP 2017082813A JP 2017082813 A JP2017082813 A JP 2017082813A JP 6771420 B2 JP6771420 B2 JP 6771420B2
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steel pipe
dimensional code
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知哉 曽和
知哉 曽和
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JFE Steel Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、鋼管の製造工程で、その規格や製造情報を識別し、鋼管に施すべき加工処理を管理する鋼管の識別管理方法に係り、特に、複数の製造工程で加工処理が施される継目無鋼管の鋼管1本毎の自動識別管理方法に関する。 The present invention relates to a steel pipe identification management method for identifying specifications and manufacturing information in a steel pipe manufacturing process and controlling the processing to be performed on the steel pipe, and in particular, a seam in which the processing is performed in a plurality of manufacturing processes. The present invention relates to an automatic identification management method for each steel pipe of a steel-free pipe.

継目無鋼管は、ビレットの製造から加熱、圧延、熱処理、精整、検査など複数の製造工程を経て製造され、製造部門では、製品規格や要求性能毎に各製造工程で施す加工処理を複数の工場間を移動する鋼管に対し詳細に管理する必要がある。また、近年では、品質保証の観点から、各鋼管の製造履歴を自動で記録することによって製品1本毎の製造履歴を管理することも要求されるようになり、各製造工程において鋼管1本毎に所定の項目の製造情報(例えば、品種、圧延番号、カット番号、ピース番号等)を自動で付加し、後続の製造工程を行う工場で該製造情報を自動で読取る技術が必要となっている。 Seamless steel pipes are manufactured through multiple manufacturing processes such as billet manufacturing, heating, rolling, heat treatment, rectification, and inspection. In the manufacturing department, multiple processing processes are performed in each manufacturing process for each product standard and required performance. It is necessary to manage steel pipes moving between factories in detail. Further, in recent years, from the viewpoint of quality assurance, it has become required to manage the manufacturing history of each product by automatically recording the manufacturing history of each steel pipe, and for each steel pipe in each manufacturing process. There is a need for a technology that automatically adds manufacturing information (for example, product type, rolling number, cut number, piece number, etc.) of a predetermined item to the product and automatically reads the manufacturing information at a factory that performs a subsequent manufacturing process. ..

従来、鋼管1本毎の識別管理は、鋼管の内面または外面に製品規格などの所定の項目を印字する、あるいは所定の項目を印字したラベルを貼付する等の方法で行われてきた。しかし、上記の従来方法では、それぞれ以下のような問題点があった。 Conventionally, identification management for each steel pipe has been performed by printing a predetermined item such as a product standard on the inner surface or the outer surface of the steel pipe, or attaching a label on which the predetermined item is printed. However, the above-mentioned conventional methods have the following problems.

鋼管の内面または外面に印字する方法では、鋼管の外面に印字した場合は、鋼管が搬送中に回転するため、回転中に文字を判読することが困難であることに加え、擦れ等によって印字された文字が消失または不鮮明になって文字を認識する際に誤読する可能性があること、また、鋼管の内面に印字する場合は、印字場所が管端部に限定されるため印字する文字数に制限があるとともに、小径鋼管では、機械的に印字することが不可能である等の問題があった。また、印字したラベルを貼付する方法では、貼付したラベルを自動で剥がすことが困難であり、ラベルを剥がしやすい仕様にすると製造過程でラベルが剥離して脱落するという問題があった。 In the method of printing on the inner or outer surface of the steel pipe, when printing on the outer surface of the steel pipe, the steel pipe rotates during transportation, which makes it difficult to read the characters during rotation and prints due to rubbing or the like. There is a possibility of misreading when recognizing characters because the characters are lost or blurred, and when printing on the inner surface of a steel pipe, the printing location is limited to the end of the pipe, so the number of characters to be printed is limited. In addition, there is a problem that it is impossible to print mechanically with a small diameter steel pipe. Further, in the method of attaching the printed label, it is difficult to automatically peel off the attached label, and if the specifications are such that the label can be easily peeled off, there is a problem that the label is peeled off and falls off in the manufacturing process.

そこで、特許文献1に、電気的絶縁性を有する軽量固体のホルダーにICタグを装着し、前記ホルダーを、衝撃エネルギーの吸収が可能な接着媒体を介して鋼管の内面に貼り付ける一方で、前記鋼管の開口面に対向する位置に読取用アンテナを配設して、前記ICタグに保存された情報を前記読取用アンテナで読取る鋼管の識別管理方法が開示されている。 Therefore, in Patent Document 1, an IC tag is attached to a lightweight solid holder having electrical insulation, and the holder is attached to the inner surface of a steel pipe via an adhesive medium capable of absorbing impact energy. A method for identifying and managing a steel pipe in which a reading antenna is arranged at a position facing the opening surface of the steel pipe and the information stored in the IC tag is read by the reading antenna is disclosed.

また、特許文献2には、管情報を符号化したマトリクスコードを、幅の周角度が30°以下となるようにレーザー光により管端部に加工するステップと、鋼管が回転しながら搬送される際に、該マトリクスコードをリニアセンサー型カメラによって自動で読取るステップと、該マトリクスコードをエリアセンサー型カメラによって手動で読取るステップとを備え、マトリクスコードを読取ることで、それぞれの鋼管に応じた製造情報および品質情報を管番号毎に識別・記録することにより製造履歴を管理し、必要に応じて、管情報を取り出せるようにした鋼管の生産管理方法が開示されている。 Further, Patent Document 2 describes a step of processing a matrix code in which pipe information is encoded into a pipe end portion by laser light so that a circumferential angle of width is 30 ° or less, and a steel pipe is conveyed while rotating. At that time, a step of automatically reading the matrix code by the linear sensor type camera and a step of manually reading the matrix code by the area sensor type camera are provided, and by reading the matrix code, manufacturing information corresponding to each steel pipe is provided. Also, a production control method for steel pipes is disclosed in which the manufacturing history is managed by identifying and recording the quality information for each pipe number, and the pipe information can be taken out as needed.

特開2009−301391号公報JP-A-2009-301391 特許第5196082号公報Japanese Patent No. 5196082

しかしながら、特許文献1に開示されている方法では、ラベルを貼付する場合と同様にICタグの着脱を自動化することが困難であり、使用したICタグを回収して再利用する際にも人的作業負荷が発生するという問題があった。 However, with the method disclosed in Patent Document 1, it is difficult to automate the attachment / detachment of the IC tag as in the case of attaching the label, and it is also human when collecting and reusing the used IC tag. There was a problem that a workload was generated.

また、特許文献2に開示されている方法は、マトリクスコードをレーザー光によって管表面に加工する際に発生する熱が鋼管の組織等に影響を与えるため、最終製品に前記マトリクスコードを残すことが困難であるとともに、加工時間が長いという問題があった。 Further, in the method disclosed in Patent Document 2, since the heat generated when the matrix code is processed on the pipe surface by laser light affects the structure of the steel pipe and the like, the matrix code may be left in the final product. There was a problem that it was difficult and the processing time was long.

本発明は、上述のような問題点に鑑みてなされたものであり、自動読取り時の誤読が無く自動で識別でき、かつ貼付したラベルまたはICタグの着脱やレーザー加工部の切除などの人的作業を必要とすることのない鋼管1本毎の自動識別管理方法を提供することを目的とする。 The present invention has been made in view of the above-mentioned problems, can be automatically identified without misreading during automatic reading, and is human-like such as attaching / detaching affixed label or IC tag or cutting a laser-machined portion. An object of the present invention is to provide an automatic identification management method for each steel pipe that does not require work.

本発明者は、上述の課題を解決するため、鋼管の製造情報を鋼管に印字する方法、および印字された製造情報を自動で読取る方法などについて鋭意検討した結果、以下の要旨からなる発明を完成した。
(1)複数の製造工程で加工処理が施される鋼管の1本毎の自動識別管理方法であって、鋼管の製造情報を符号化した2次元コードを、該2次元コードを構成するセルをそれぞれ複数のドットに分割して当該鋼管の外表面に印字するステップと、前記鋼管が搬送されてきた際に、各カメラの視野の合計が前記鋼管の全周の外表面を覆うように配置された6台以上のカメラによって前記2次元コードの印字を自動で読取るステップと、を備え、前記読取り情報を管理情報として自動で記録し、前記管理情報を必要に応じて随時取り出せるようにしたことを特徴とする鋼管1本毎の自動識別管理方法。
(2)前記分割するドット数を4ドット、9ドット、または16ドットのいずれかとすることを特徴とする(1)に記載の鋼管1本毎の自動識別管理方法。
(3)前記鋼管の直径が165〜440mmであることを特徴とする(1)または(2)に記載の鋼管1本毎の自動識別管理方法。
The present inventor has completed an invention consisting of the following gist as a result of diligent studies on a method of printing steel pipe manufacturing information on a steel pipe and a method of automatically reading the printed manufacturing information in order to solve the above-mentioned problems. did.
(1) An automatic identification management method for each steel pipe that is processed in a plurality of manufacturing processes, and a two-dimensional code that encodes steel pipe manufacturing information is used as a cell that constitutes the two-dimensional code. A step of dividing each into a plurality of dots and printing on the outer surface of the steel pipe and a total of the fields of view of each camera when the steel pipe is conveyed are arranged so as to cover the outer surface of the entire circumference of the steel pipe. It is provided with a step of automatically reading the print of the two-dimensional code by six or more cameras, automatically recording the read information as management information, and making it possible to retrieve the management information at any time as needed. A featured automatic identification management method for each steel pipe.
(2) The automatic identification management method for each steel pipe according to (1), wherein the number of dots to be divided is any of 4 dots, 9 dots, or 16 dots.
(3) The automatic identification management method for each steel pipe according to (1) or (2), wherein the diameter of the steel pipe is 165 to 440 mm.

本発明により、自動読取り時の誤読が無く、貼付したラベルまたはICタグの着脱やレーザー加工部の切除などの人的作業を必要とすることのない鋼管1本毎の自動識別管理が可能となる。また、2次元コードを構成するセルをそれぞれ複数のドットに分割して印字することで、印字後の乾燥時間が従来の1/4以下に短縮でき、鋼管の生産性が向上できる。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to perform automatic identification management for each steel pipe without misreading at the time of automatic reading and without requiring human work such as attaching / detaching affixed label or IC tag or cutting a laser machined portion. .. Further, by dividing each cell constituting the two-dimensional code into a plurality of dots and printing, the drying time after printing can be shortened to 1/4 or less of the conventional one, and the productivity of the steel pipe can be improved.

2次元コードの印字を比較した図である。It is a figure which compared the printing of a two-dimensional code. 本発明における搬送スキッドにおける6台のカメラの配置例と各撮像領域を模式的に示す図である。It is a figure which shows typically the arrangement example of 6 cameras in the transport skid in this invention, and each image pickup area.

次に、本発明の実施形態について以下に説明する。
継目無鋼管は、製品規格や要求性能毎に、ビレットの製造から加熱、圧延、熱処理などのロット単位で処理するバッチ処理工程と、精整、検査などの管1本単位で処理する1本処理工程を経て製造される。そのため、製造部門では、特に、前記バッチ処理工程から前記1本処理工程へ移動する時点で、鋼管1本毎に識別し当該鋼管に施すべき加工処理を管理するための製造情報を鋼管に付加し、鋼管1本毎に識別管理して前記1本処理を施す必要がある。
Next, an embodiment of the present invention will be described below.
For seamless steel pipes, batch processing processes such as billet manufacturing, heating, rolling, and heat treatment are processed in lot units, and single pipe processing such as rectification and inspection is performed for each product standard and required performance. Manufactured through a process. Therefore, in the manufacturing department, in particular, at the time of moving from the batch processing step to the one processing step, manufacturing information for identifying each steel pipe and managing the processing to be performed on the steel pipe is added to the steel pipe. , It is necessary to identify and manage each steel pipe and perform the above-mentioned one treatment.

そこで、本発明では、まず、最終のバッチ処理工程である熱処理が施された後に、当該鋼管の製造情報を2次元コードに符号化し、該2次元コードを構成するセルをそれぞれ複数のドットに分割して前記鋼管の外表面に印字するステップを備える。2次元コードを構成する各セルを図1に示すように複数のドットに分割して印字することにより、分割しない場合に比べ、1ドット当たりの塗料面積が小さくなるため、印字後の塗料の乾燥時間が短縮され、塗料のたれや滲みを抑制することができる。例えば、図1(a)に示すように、印字サイズ48mm、16セル×16セルの2次元コードをドット径3mmのドット印字機で印字した従来法の場合、1ドット当たりの塗料面積は約7.1mmであるのに対し、図1(b)に示すように、前記2次元コードの各セルを4ドットに分割してドット径1.5mmのドット印字機で印字した本発明法の場合、1ドット当たりの塗料面積は従来法の約1/4である約1.8mmとなり、塗料面積に均等に塗料が付着したとすると塗料面積と塗料の乾燥時間は比例関係にあるため、塗料の乾燥時間が従来法の約1/4になる。さらに、鋼管の搬送過程で印字の擦れが発生した場合でも、図1(b)の2次元コードでは、各セルが4ドットに分割して印字されているため、印字されたすべてのドットが消滅する確率が低減し、後工程での読取率が低下することを抑制できる。また、分割するドット数は、4ドット、9ドットまたは16ドットのいずれかとすることが好ましい。セルを分割する際の最小の分割数が4ドット(縦2×横2)であり、また最大の分割数は、2次元コード(DataMatrix)の特性上最低でも縦8セルが必要であり、実用に使用する印字機のドット数縦32ドットを考慮すると、縦4×横4の16ドットを最大の分割数とすることが望ましい。 Therefore, in the present invention, first, after heat treatment, which is the final batch processing step, the manufacturing information of the steel pipe is encoded into a two-dimensional code, and the cells constituting the two-dimensional code are each divided into a plurality of dots. A step of printing on the outer surface of the steel pipe is provided. By dividing each cell constituting the two-dimensional code into a plurality of dots and printing as shown in FIG. 1, the paint area per dot becomes smaller than in the case where the two-dimensional code is not divided, so that the paint is dried after printing. The time is shortened, and the dripping and bleeding of the paint can be suppressed. For example, as shown in FIG. 1A, in the case of the conventional method in which a two-dimensional code having a print size of 48 mm and 16 cells × 16 cells is printed by a dot printing machine having a dot diameter of 3 mm, the paint area per dot is about 7. whereas a .1Mm 2, as shown in FIG. 1 (b), when the present invention method in which printing by dividing each cell of the two-dimensional code in 4 dots at dot printing machine dot diameter 1.5mm The paint area per dot is about 1.8 mm 2 , which is about 1/4 of the conventional method. If the paint adheres evenly to the paint area, the paint area and the paint drying time are in a proportional relationship. Drying time is about 1/4 of the conventional method. Further, even if the printing is rubbed during the transportation process of the steel pipe, in the two-dimensional code of FIG. 1B, each cell is divided into 4 dots and printed, so that all the printed dots disappear. It is possible to reduce the probability of printing and prevent the reading rate from decreasing in the subsequent process. Further, the number of dots to be divided is preferably any one of 4 dots, 9 dots or 16 dots. The minimum number of divisions when dividing cells is 4 dots (vertical 2 x horizontal 2), and the maximum number of divisions requires at least 8 vertical cells due to the characteristics of the two-dimensional code (DataMatrix), which is practical. Considering the number of dots of the printing machine used for the above 32 dots, it is desirable that 16 dots of 4 vertical × 4 horizontal be the maximum number of divisions.

また、2次元コードを印字する位置は、配置する読取用のカメラの位置や視野の範囲によって決まるが、対象とする鋼管の外径が165〜440mmである製造ラインの場合には、2次元コードの印字とスキッドレールとが干渉しない位置、すなわち管端から管軸方向に400〜600mmの位置とする。さらに、2次元コードが鋼管の外表面の複数個所に印字されていると読取率を向上することができるため、2次元コードを前記鋼管の当該位置の外表面円周上で等間隔の複数個所に印字することが好ましい。 The position for printing the two-dimensional code is determined by the position of the reading camera to be placed and the range of the field of view, but in the case of a production line where the outer diameter of the target steel pipe is 165 to 440 mm, the two-dimensional code is printed. position the printing and the skid rails do not interfere, i.e. shall be the position of 400 to 600 meters m from the pipe end in the axial direction of the tube. Further, if the two-dimensional code is printed on a plurality of places on the outer surface of the steel pipe, the reading rate can be improved. Therefore, the two-dimensional code is printed on the outer surface circumference of the steel pipe at a plurality of places at equal intervals. It is preferable to print on.

また、本発明では、図2に示すように、次工程に向けて搬送スキッドレール3上を回転しながら搬送される鋼管を搬送スキッドに配設されたストッパ4により一時停止させることが好ましい。移動距離が10m以上の一般的な搬送スキッドでは、搬送スキッドレール3上を回転して移動する鋼管の移動速度は1.5m/s以上となり、鋼管が回転移動中ではカメラによる前記2次元コードの読取率が90%以下となるため、カメラで読取る際に鋼管をストッパ4により一時(約100ms)停止させて読取率を向上させる。 Further, in the present invention, as shown in FIG. 2, it is preferable that the steel pipe transported while rotating on the transport skid rail 3 is temporarily stopped by the stopper 4 provided on the transport skid for the next step. In a general transport skid with a movement distance of 10 m or more, the moving speed of the steel pipe rotating and moving on the transport skid rail 3 is 1.5 m / s or more, and while the steel pipe is rotating and moving, the two-dimensional code by the camera is used. Since the reading rate is 90% or less, the steel pipe is temporarily stopped (about 100 ms) by the stopper 4 when reading with the camera to improve the reading rate.

次に、本発明では、各カメラの視野の合計が一時停止した鋼管の管端から管軸方向に300〜550mmの範囲における全周の外表面を覆うように最大径440mmの鋼管が停止した位置において中心から約700mm離れてサテライト状に配置された6台以上のカメラによって前記2次元コードの印字を自動で読取るステップを備える。6台以上のカメラを配置することにより、対象とする最大径から最小径の鋼管の全周の外表面を各カメラの視野を併せた全視野の範囲内とすることができ、前記鋼管の外表面に印字された前記2次元コードを確実に読取ることができる。 Next, in the present invention, the position where the steel pipe having a maximum diameter of 440 mm is stopped so as to cover the outer surface of the entire circumference in the range of 300 to 550 mm in the pipe axis direction from the pipe end of the steel pipe in which the total field of view of each camera is temporarily stopped. A step of automatically reading the printing of the two-dimensional code by six or more cameras arranged in a satellite shape at a distance of about 700 mm from the center is provided. By arranging 6 or more cameras, the outer surface of the entire circumference of the target maximum to minimum diameter steel pipe can be within the range of the entire field of view including the field of view of each camera, and the outside of the steel pipe. The two-dimensional code printed on the surface can be reliably read.

さらに、本発明では、前記読取り情報を工程の管理情報として自動で記録し、前記管理情報を必要に応じて随時取り出せるようにする。後続の工程では、搬送されてきた鋼管の製造履歴を含む情報を必要に応じて随時取り出せるため、鋼管1本毎に識別管理することができる。 Further, in the present invention, the read information is automatically recorded as process control information so that the control information can be retrieved at any time as needed. In the subsequent process, information including the manufacturing history of the conveyed steel pipes can be taken out at any time as needed, so that each steel pipe can be identified and managed.

なお、上述のカメラによる自動読取りで2次元コードの読取り不良が発生した場合にオペレータの人的介入で当該鋼管の識別管理ができるように、2次元コードに加え、鋼管1本毎を識別する識別管理番号等の文字を印字しておくことが望ましい。 In addition to the two-dimensional code, identification that identifies each steel pipe is performed so that the identification management of the steel pipe can be performed by human intervention of the operator when a reading failure of the two-dimensional code occurs in the automatic reading by the above-mentioned camera. It is desirable to print characters such as a control number.

また、本発明における2次元コードの印字は、鋼管製造工程において、鋼管の品質等に影響するものではないため、最終製品に品質情報として残すことも可能であり、出荷先における当該製品の識別管理に供することができる。 Further, since the printing of the two-dimensional code in the present invention does not affect the quality of the steel pipe in the steel pipe manufacturing process, it is possible to leave it as quality information in the final product, and the identification management of the product at the shipping destination. Can be offered to.

外径:165〜440mmの継目無鋼管を製造する工場において、鋼管を熱処理工程から精整工程へ移動させる際、精整工程の搬送スキッドへ搬送する前に当該鋼管の製造情報を符号化した2次元コードを印字し、前記鋼管が前記搬送スキッドに搬送された後、図2に示すように配置した6台のカメラで前記2次元コードを読取り、その読取精度から本発明によって鋼管1本毎の自動識別管理が可能であることを確認した。 In a factory that manufactures seamless steel pipes with an outer diameter of 165 to 440 mm, when moving a steel pipe from a heat treatment process to a rectification process, the production information of the steel pipe was encoded before being transferred to the transfer skid in the rectification process. After printing the dimensional code and transporting the steel pipe to the transport skid, the two-dimensional code is read by six cameras arranged as shown in FIG. 2, and from the reading accuracy, each steel pipe is read according to the present invention. It was confirmed that automatic identification management is possible.

2次元コードの印字には表1に示す仕様のマークテック社製印字機を使用し、精整工程の搬送スキッドのスキッドレールと干渉しない鋼管の管端から管軸方向に400mm入った位置の外表面に表3に示す型式の2次元コードを印字した。 A Marktech printing machine with the specifications shown in Table 1 is used to print the two-dimensional code, and the outside of the position 400 mm in the pipe axis direction from the pipe end of the steel pipe that does not interfere with the skid rail of the transport skid in the rectification process. The two-dimensional code of the model shown in Table 3 was printed on the surface.

また、印字した2次元コードの読取装置として、表2に示す仕様の2次元コード読取用カメラ(キーエンス社製オートフォーカスコードリーダSR−1000W)6台(カメラ51〜56)を、前記搬送スキッドにおいて前記印字した位置が撮像範囲となる管軸方向の垂直断面上で、図2に示すように、ストッパ4で停止した当該設備において最大径である外径440mmの鋼管2の同心円となる半径703mmの円周上の真上をカメラ51の配置位置として、前記円周上の円周方向60°間隔でサテライト状に配置した。この場合、各カメラのチューニング(事前設定)を当該カメラから600mmの位置で行うと、前記鋼管2の全周を隣接するカメラの視野が重複する領域とすることができ、鋼管2が停止した際に2次元コードの印字が鋼管2の外表面のどの円周方向位置であっても前記6台のカメラの内のいずれかのカメラで前記2次元コードを読取ることができる。 Further, as a device for reading the printed two-dimensional code, six two-dimensional code reading cameras (auto focus code reader SR-1000W manufactured by Keyence Co., Ltd.) (cameras 51 to 56) having the specifications shown in Table 2 are mounted on the transport skid. As shown in FIG. 2, on a vertical cross section in the direction of the tube axis where the printed position is the imaging range, a radius of 703 mm, which is a concentric circle of a steel tube 2 having an outer diameter of 440 mm, which is the maximum diameter in the facility stopped by the stopper 4. The cameras 51 were arranged in a satellite shape at intervals of 60 ° in the circumferential direction on the circumference, with the camera 51 placed directly above the circumference. In this case, if tuning (presetting) of each camera is performed at a position 600 mm from the camera, the entire circumference of the steel pipe 2 can be set as an area where the fields of view of adjacent cameras overlap, and when the steel pipe 2 stops. The two-dimensional code can be read by any one of the six cameras regardless of the circumferential position of the outer surface of the steel pipe 2.

そこで、上記のカメラ配置を本発明例として、当該工場において対象となる最小径(165mm)の鋼管1および最大径(440mm)の鋼管2に印字された2次元コードの読取りを行い、読取精度を読取率とマッチングレベル(2次元コードの印字品質による読取りやすさを100段階で評価する指標)で評価した。また、比較例として、前記6台のカメラの内の図2に示すカメラ51だけを読取装置とした場合の読取精度も評価した。 Therefore, using the above camera arrangement as an example of the present invention, the two-dimensional code printed on the steel pipe 1 having the minimum diameter (165 mm) and the steel pipe 2 having the maximum diameter (440 mm), which are the targets of the factory, is read to improve the reading accuracy. It was evaluated by the reading rate and the matching level (an index for evaluating the readability of the two-dimensional code according to the print quality on a 100-point scale). Further, as a comparative example, the reading accuracy when only the camera 51 shown in FIG. 2 among the six cameras was used as the reading device was also evaluated.

上記各鋼管に印字された2次元コードの読取精度を評価した結果、表3に示すように、本発明例は何れも優れた読取精度を有していることが明らかになった。したがって、読取り情報を管理情報として記録し、前記管理情報を必要に応じて随時取り出せるようにすることにより鋼管1本毎の自動識別管理ができることが確認された。 As a result of evaluating the reading accuracy of the two-dimensional code printed on each of the steel pipes, it was clarified that all of the examples of the present invention have excellent reading accuracy as shown in Table 3. Therefore, it was confirmed that automatic identification management for each steel pipe can be performed by recording the read information as management information and making it possible to retrieve the management information at any time as needed.

Figure 0006771420
Figure 0006771420

Figure 0006771420
Figure 0006771420

Figure 0006771420
Figure 0006771420

1 最小径(165mm)の鋼管
2 最大径(440mm)の鋼管
3 スキッドレール
4 ストッパ
51 カメラ
52 カメラ
53 カメラ
54 カメラ
55 カメラ
56 カメラ
1 Minimum diameter (165 mm) steel pipe 2 Maximum diameter (440 mm) steel pipe 3 Skid rail 4 Stopper 51 Camera 52 Camera 53 Camera 54 Camera 55 Camera 56 Camera

Claims (3)

複数の製造工程で加工処理が施される鋼管の1本毎の自動識別管理方法であって、
鋼管の製造情報を符号化した2次元コードを、該2次元コードを構成するセルをそれぞれ複数のドットに分割して当該鋼管の管端から管軸方向に400〜600mmの範囲の外表面にノズルから塗料を吹き付けて印字するステップと、
前記鋼管が搬送されてきた際に、各カメラの視野の合計が前記鋼管の全周の外表面を覆うように配置された6台以上のカメラによって前記2次元コードの印字を自動で読取るステップと、
を備え、
前記カメラで読取った前記2次元コードの情報を製造履歴の管理情報として自動で記録し、前記管理情報を必要に応じて随時取り出せるようにしたことを特徴とする鋼管1本毎の自動識別管理方法。
It is an automatic identification management method for each steel pipe that is processed in multiple manufacturing processes.
A two-dimensional code in which manufacturing information of a steel pipe is encoded is divided into a plurality of dots for each cell constituting the two-dimensional code, and a nozzle is provided on the outer surface in the range of 400 to 600 mm in the pipe axial direction from the pipe end of the steel pipe. Steps to spray paint from and print
When the steel pipe is conveyed, the step of automatically reading the print of the two-dimensional code by six or more cameras arranged so that the total field of view of each camera covers the outer surface of the entire circumference of the steel pipe. ,
With
Recorded automatically the information of the two-dimensional code Tsu read by the camera as the management information of the production history, automatic identification management of the steel tube one each, characterized in that, made available at any time when necessary the management information Method.
前記分割するドット数を4ドット、9ドット、または16ドットのいずれかとすることを特徴とする請求項1に記載の鋼管1本毎の自動識別管理方法。 The automatic identification management method for each steel pipe according to claim 1, wherein the number of dots to be divided is any of 4 dots, 9 dots, or 16 dots. 前記鋼管の直径が165〜440mmであることを特徴とする請求項1または2に記載の鋼管1本毎の自動識別管理方法。 The automatic identification management method for each steel pipe according to claim 1 or 2, wherein the diameter of the steel pipe is 165 to 440 mm.
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