JPH0411821B2 - - Google Patents
Info
- Publication number
- JPH0411821B2 JPH0411821B2 JP58029845A JP2984583A JPH0411821B2 JP H0411821 B2 JPH0411821 B2 JP H0411821B2 JP 58029845 A JP58029845 A JP 58029845A JP 2984583 A JP2984583 A JP 2984583A JP H0411821 B2 JPH0411821 B2 JP H0411821B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- cutting
- metal material
- level
- 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 - Lifetime
Links
- 230000007547 defect Effects 0.000 claims description 17
- 230000002950 deficient Effects 0.000 claims description 14
- 239000007769 metal material Substances 0.000 claims description 13
- 238000007689 inspection Methods 0.000 claims description 10
- 239000002344 surface layer Substances 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- -1 pinholes Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
Description
【発明の詳細な説明】
本発明は金属材の欠陥検査に使用する装置に関
し、具体的には金属材の表層部に存在するノロカ
ミ、ピンホール、砂カミ等の表層部欠陥を検出す
ることにより溶削手入の要否を判定する欠陥検査
に使用する装置を提案するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus used for defect inspection of metal materials, and specifically, by detecting surface defects such as slag, pinholes, and sand stains existing on the surface of metal materials. This paper proposes a device used for defect inspection to determine whether or not cutting treatment is necessary.
鋼片の表面直下つまり表層部欠陥の溶削手入方
法としては、従来ハンドスカーフのトーチを保持
した作業者が鋼片上に位置し、鋼片表面をスカー
フイング（溶削）し、欠陥が存在する場合に発生
する輝度の高い火花の発生量を減光メガネを通し
て目視観察し、火花の発生量が多い箇所は更に深
く溶削除去することが行なわれていた。しかしな
がら、この方法による場合はスカーフイングを行
なう作業者の姿勢が悪くなり、疲労が甚だしいこ
と、熱間鋼片には元より適用できず、この場合に
は熱間鋼片を一旦冷却した後、上記作業を行な
い、その後再加熱して熱間圧延を行なう必要があ
り、この間の熱エネルギのロス、時間的ロスが大
きいこと、更には欠陥の存在しない鋼片について
も上記作業を行う必要があり、この場合には多大
の無駄時間が生じる等、能率よく溶削手入が行な
えないという問題点があつた。また、この方法に
よる手入作業は作業者の経験と勘により行なわれ
る為、個人誤差が大きくむらのない手入作業が行
なえないという問題点もあつた。 Traditionally, a worker holding a handscarf torch positions himself on the steel piece and scarfs (cuts) the surface of the steel piece to remove defects in the surface layer. The amount of high-brightness sparks generated during this process was visually observed through dimming glasses, and areas where a large amount of sparks were generated were removed by deeper melting. However, when using this method, the posture of the worker performing scarfing becomes poor, resulting in severe fatigue, and it cannot be applied to hot-worked steel billets. After performing the above operations, it is necessary to reheat and hot-roll the steel, which results in a large loss of thermal energy and time, and furthermore, it is necessary to perform the above operations even on steel slabs with no defects. In this case, there were problems such as a large amount of wasted time and the inability to carry out efficient cutting procedures. Furthermore, since maintenance work using this method is performed based on the experience and intuition of the operator, there is a problem in that individual errors are large and uniform maintenance work cannot be performed.
本発明は斯かる事情に鑑みてなされたものであ
り、欠陥を光学的に検出し、更にはこの検出値に
基いて溶削手入の要否を判定する金属材の欠陥検
査装置を提供することを目的とする。 The present invention has been made in view of such circumstances, and provides a defect inspection device for metal materials that optically detects defects and further determines whether or not melting treatment is necessary based on the detected value. The purpose is to
本発明に係る金属材の欠陥検査装置は、溶削火
炎にて金属材表層部を溶削した場合に、金属材の
表層部に存する欠陥から発生する欠陥火花を検知
する金属材の欠陥検査装置において、前記金属材
との相対移動を可能とした、前記溶削火炎を撮像
する撮像装置と、該撮像装置の出力信号から所定
レベル以上の部分を抽出するレベル弁別回路と、
前記出力信号を微分し、微分信号から所定レベル
以上の部分を抽出する微分２値化回路と、レベル
弁別回路及び微分２値化回路の抽出信号の論理積
をとる論理積回路と、該論理積回路の出力信号に
基いて欠陥火花の発生量を定量する回路とを具備
し、その定量結果に基いて欠陥を検出することを
特徴とする。 A defect inspection device for metal materials according to the present invention detects defective sparks generated from defects in the surface layer of the metal material when the surface layer of the metal material is cut by a cutting flame. an imaging device for imaging the cutting flame, which is movable relative to the metal material; and a level discrimination circuit for extracting a portion of a predetermined level or higher from an output signal of the imaging device;
a differential binarization circuit that differentiates the output signal and extracts a portion of a predetermined level or higher from the differential signal; an AND circuit that takes the AND of the extracted signals of the level discrimination circuit and the differential binarization circuit; The present invention is characterized by comprising a circuit for quantifying the amount of defective sparks generated based on an output signal of the circuit, and detecting a defect based on the quantitative result.
以下本発明をその実施例を示す図面に基づいて
詳述する。第１図は本発明の溶削検査装置の機構
部の略示平面図、第２図は一部を破砕して示す第
１図の−線による拡大断面図である。鋼片１
は搬送ロール２，２……２からなるローラコンベ
アにてその長手方向を搬送ロール２，２……２の
延設方向（以下Ｙ軸方向といい、同一半面内にて
これと直交する方向を以下Ｘ軸方向という）と直
角にして本発明装置の設置位置迄送られてくる。
走行レール３，３′は搬送ロール２，２を挟んで
Ｘ軸方向に平行に並設され、その両端部に固着さ
れた取付板３ａ，３ａ，３ａ，３ａを介して図示
しない基台上に固着されている。走行レール３，
３′の断面は共に凸状に形成されていて、一方の
走行レール３の頂部にはＸ軸方向全長にわたつて
ラツク３ｂが形成されている。これらの走行レー
ル３，３′には走行台車４がＸ軸方向への移動が
可能に載置されている。走行台車４はＹ軸方向に
長い箱体であり、走行レール３側に位置する長手
方向端面には適大の穴が開設されており、この穴
に出力軸７ａを挿通するようにして、ギヤード・
モータ７がその外面に取付けられている。走行台
車４内に挿通された出力軸７ａの先端部にはピニ
オン８を嵌着してあり、ピニオン８の下側に位置
する走行台車４の下面には開口部が設けられ、ピ
ニオン８の周面の一部がこの開口部から露出し、
前記ラツク３ｂと噛合している。走行レーダ３′
と対向する走行台車４の下面部分には走行レール
３′と係合して転動する車輪（図示せず）が取付
けられている。走行台車４の長手方向中央部であ
つて、Ｘ軸の正方向側に位置する走行台車４の側
壁には、その先端部を鋼片１側に下傾した溶削火
口５が挿通固着されている。溶削火口５の固着位
置から走行レール３側に適長離隔した走行台車４
の上面には、その光軸を溶削火口５からの溶削火
炎が鋼片１上に放射される領域に臨ませてテレビ
カメラ６が固着され、その光学部には減光用の光
学フイルム６ａが取付けられている。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a schematic plan view of the mechanical part of the cutting inspection apparatus of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line - - in FIG. 1, partially broken away. Steel piece 1
is a roller conveyor consisting of transport rolls 2, 2...2, and its longitudinal direction is the extension direction of the transport rolls 2, 2...2 (hereinafter referred to as the Y-axis direction, and the direction perpendicular to this within the same half plane is It is fed to the installation position of the device of the present invention at right angles to the X-axis direction (hereinafter referred to as the X-axis direction).
The traveling rails 3, 3' are arranged parallel to each other in the X-axis direction with the transport rolls 2, 2 in between, and are mounted on a base (not shown) via mounting plates 3a, 3a, 3a, 3a fixed to both ends thereof. It is fixed. Traveling rail 3,
Both rails 3' have a convex cross section, and a rack 3b is formed at the top of one of the running rails 3 over the entire length in the X-axis direction. A traveling carriage 4 is mounted on these traveling rails 3, 3' so as to be movable in the X-axis direction. The traveling trolley 4 is a box body long in the Y-axis direction, and a hole of an appropriate size is provided in the longitudinal end face located on the traveling rail 3 side, and the output shaft 7a is inserted through this hole to connect the gear・
A motor 7 is mounted on its outer surface. A pinion 8 is fitted to the tip of the output shaft 7a inserted into the traveling truck 4, and an opening is provided on the lower surface of the traveling truck 4 located below the pinion 8, so that the periphery of the pinion 8 can be opened. A portion of the surface is exposed through this opening,
It meshes with the rack 3b. Traveling radar 3'
Wheels (not shown) that roll while engaging with the traveling rail 3' are attached to the lower surface of the traveling carriage 4 facing the traveling rail 3'. In the side wall of the traveling vehicle 4 located in the longitudinal center of the traveling vehicle 4 and on the positive side of the X-axis, a welding spout 5 whose tip end is inclined downward toward the steel billet 1 side is inserted and fixed. There is. A traveling trolley 4 is spaced an appropriate distance from the fixed position of the cutting crater 5 toward the traveling rail 3 side.
A television camera 6 is fixed to the top surface with its optical axis facing the area where the cutting flame from the cutting nozzle 5 is radiated onto the steel piece 1, and an optical film for dimming is installed in the optical part of the television camera 6. 6a is attached.
第３図は本発明に使用する信号処理系のブロツ
ク図、第４図はその動作説明のための信号波形図
である。テレビカメラ６は、前記溶削火口５から
鋼片１の表面に対して吹付けられるO2，C2H2等
の混合ガスからなる溶削火炎及び鋼片１の表層部
に欠陥が存在する場合に発生する、溶削火炎の輝
度よりも高い火花（以下欠陥火花という）を撮像
するべく設けてあり、その撮像画像は同期信号発
生器１１から与えられる垂直同期信号及び水平同
期信号によつて走査され、画像信号としてレベル
弁別回路１２及び微分２値化回路１３に与えられ
る。第４図イは画像信号の一部を略示している
が、レベル弁別回路１２には前記欠陥火花の像の
輝度よりも少し低いレベルのしきい値（一点鎖線
で示す）が設定されており、画像信号をこのしき
い値と比較することにより２値化し、画像信号が
しきい値よりも高いレベルである場合にハイレベ
ルとなる第４図ロに示す如きパルス信号を論理積
回路１４の１入力端子へ与える。微分２値化回路
１３は画像信号をまず微分して第４図ハに示す如
き微分信号を得、これを所定しきい値（一点鎖線
で示す）と比較して微分信号がしきい値より高レ
ベルである場合にハイレベルとなる第４図ニに示
す如きパルス信号を論理積回路１４の他入力端子
へ与える。微分２値化回路１３のしきい値は欠陥
火花による画像信号のレベル変化に応じた微分値
よりも少し低い値としてある。論理積回路１４は
両パルス信号入力が共にハイレベルの場合にハイ
レベルとなる第４図ホに示す如きパルス信号に出
力し、これをカウンタ１５へ計数イネーブル信号
として与える。 FIG. 3 is a block diagram of a signal processing system used in the present invention, and FIG. 4 is a signal waveform diagram for explaining its operation. The television camera 6 detects a cutting flame made of a mixed gas of O 2 , C 2 H 2, etc. that is blown onto the surface of the steel billet 1 from the cutting tip 5 and defects present in the surface layer of the steel billet 1. The device is provided to capture an image of sparks (hereinafter referred to as defective sparks) that occur when the brightness is higher than that of the fusing flame, and the captured image is generated by the vertical synchronization signal and horizontal synchronization signal given from the synchronization signal generator 11. It is scanned and given to the level discrimination circuit 12 and differential binarization circuit 13 as an image signal. FIG. 4A schematically shows a part of the image signal, and the level discrimination circuit 12 is set with a threshold value (indicated by a chain line) that is a little lower than the brightness of the image of the defective spark. , the image signal is binarized by comparing it with this threshold value, and when the image signal is at a higher level than the threshold value, a pulse signal as shown in FIG. 1 input terminal. The differential binarization circuit 13 first differentiates the image signal to obtain a differential signal as shown in FIG. A pulse signal as shown in FIG. 4D, which becomes high level when the signal is at a high level, is applied to the other input terminal of the AND circuit 14. The threshold value of the differential binarization circuit 13 is set to a value slightly lower than the differential value corresponding to the level change of the image signal due to defective sparks. The AND circuit 14 outputs a pulse signal, as shown in FIG.
撮像画像中の欠陥火花に相当する部分の画像信
号は急峻に立上つて高い瞬時値を示すのでレベル
弁別回路は、微分２値化回路１３の両出力パルス
信号にはそれに対応するパルスが現れる。一方、
火炎の高輝度部分〔第４図イのＡ部分〕は場合に
よつてはレベル弁別回路１２のしきい値よりも高
くなつてレベル弁別回路１２からはハイレベル信
号が得られるが、画像信号の変化は緩慢であるの
で、該当部分の微分２値化回路１３の出力はロー
レベルとなり、結局論理積回路１４からは欠陥火
花の大きさに応じた時間幅を有するパルスがその
個数分だけ出力されることになる。 Since the image signal of the portion corresponding to the defective spark in the captured image rises steeply and exhibits a high instantaneous value, the level discrimination circuit has pulses corresponding thereto appearing in both output pulse signals of the differential binarization circuit 13. on the other hand,
In some cases, the high-intensity part of the flame [part A in Figure 4A] becomes higher than the threshold of the level discrimination circuit 12, and a high-level signal is obtained from the level discrimination circuit 12, but the image signal Since the change is slow, the output of the differential binarization circuit 13 of the corresponding part becomes a low level, and the AND circuit 14 eventually outputs the number of pulses having a time width corresponding to the size of the defective spark. That will happen.
カウンタ１５には論理積回路１４が出力するパ
ルス信号の時間幅よりも十分高周波のクロツクパ
ルス〔第４図ヘ〕が発振器１６から計数対象とし
て与えられ、カウンタ１５は論理積回路１４の出
力がハイレベルである間第４図トに示す様にこの
クロツクパルスを計数する。同期信号発生器１１
の垂直同期信号は等級判定回路１７へカウンタ１
５の計数値を読込むタイミング信号として与えら
れ、またカウンタ１５へクリア信号として与えら
れる。従つて、カウンタ１５はテレビカメラ６の
撮像画像の１フレーム分における欠陥火花の個数
と大きさとに関連するクロツクパルス数の計数を
行なつて欠陥火花の発生量又は発生程度を定量化
することになり、この計数値は等級判定回路１７
にストアされる。 The counter 15 is given a clock pulse (see FIG. 4) with a frequency sufficiently higher than the time width of the pulse signal output by the AND circuit 14 from the oscillator 16 to be counted, and the counter 15 receives the clock pulse (see FIG. 4) from the oscillator 16 when the output of the AND circuit 14 is at a high level. During this period, the clock pulses are counted as shown in FIG. Synchronous signal generator 11
The vertical synchronization signal is sent to the class judgment circuit 17 by the counter 1
It is given as a timing signal to read the count value of 5, and also given to the counter 15 as a clear signal. Therefore, the counter 15 counts the number of clock pulses related to the number and size of defective sparks in one frame of the image captured by the television camera 6, thereby quantifying the amount or degree of occurrence of defective sparks. , this count value is determined by the grade judgment circuit 17
Stored in
溶削コントローラ１８はギヤード・モータ７の
回転、停止及び溶削開口５の着火、消火を制御す
る電気回路であつて、溶削開始指令信号が与えら
れると走行台車４を鋼片１の一側から他側に向け
てＸ軸方向に移動させるギヤード・モータ７を駆
動させると共に溶削火口５に着火する。そして溶
削停止指令信号が与えられるとギヤード・モータ
７を停止させ、また溶削火口５の消火を行ない、
ギヤード・モータ７を逆転して走行台車４を逆送
させる。そして、溶削コントローラ１８は溶削開
始指令信号が与えられるとこれに同期して等級判
定回路１７へ所定信号を発して溶削の開始を報
じ、また溶削停止信号が与えられるとこれに同期
して等級判定回路１７へ所定信号を発して溶削の
終了を報じる。等級判定回路１７はこの両信号の
間における複数のフイールドの画像についてのカ
ウンタ１５からの読込値につきその平均値及び最
大値を算出し、これを平均値、最大値の夫々につ
き予め設定してある基準値と比較し、それらが基
準値よりも大である場合は次工程に設置された全
面溶削手入装置（図示せず）の駆動制御回路へ始
動指令信号を発し、或は所定の警報を発する。 The cutting controller 18 is an electric circuit that controls the rotation and stopping of the geared motor 7 and the ignition and extinguishing of the cutting opening 5. When a cutting start command signal is given, the cutting controller 18 moves the traveling cart 4 to one side of the steel piece 1. The geared motor 7 is driven to move the machine in the X-axis direction toward the other side, and the fusing nozzle 5 is ignited. When a fusing stop command signal is given, the geared motor 7 is stopped, and the fusing nozzle 5 is extinguished.
The geared motor 7 is reversely rotated to send the traveling carriage 4 backward. When the fusing controller 18 is given the fusing start command signal, it synchronizes with this and issues a predetermined signal to the grade determination circuit 17 to report the start of fusing, and when the fusing stop signal is given, it synchronizes with this. Then, a predetermined signal is issued to the grade determination circuit 17 to report the completion of the melt cutting. The grade determination circuit 17 calculates the average value and maximum value of the values read from the counter 15 for images of a plurality of fields between these two signals, and sets these values in advance for each of the average value and maximum value. Compare the values with the standard values, and if they are larger than the standard values, issue a start command signal to the drive control circuit of the full-surface cutting care device (not shown) installed in the next process, or issue a predetermined alarm. emits.
なお、上述の実施例では搬送ロール上に定置さ
れた鋼片上を走行台車にて溶削検査をする構成と
したが、搬送ロールの延設方向に架設した架台に
溶削火口及びテレビカメラを固着し、搬送ロール
にて鋼片を移動させることによつて溶削検査の走
査を行なつてもよい。 In addition, in the above-mentioned embodiment, the steel piece placed on the conveyance roll was inspected by a traveling trolley, but the melting nozzle and the television camera were fixed to a pedestal installed in the extending direction of the conveyance roll. However, scanning for the cutting inspection may be performed by moving the steel piece using a conveyor roll.
叙上の如き本発明による場合は目視によらず、
自動的に欠陥検査ができるので省人が可能であ
り、また熱間金属材にも適用できるので従来の如
く被検査材を一旦冷却する必要がなく熱エネルギ
のロス、時間的ロスがなく検査−手入工程の能率
は著しく向上する。また本発明装置は欠陥を定量
化できるので品質管理上有益なデータを蓄積する
ことができる。そしてレベル弁別回路、微分２値
化回路により、画像信号を処理するものであるの
で、溶削火口と鋼片との距離或は溶削火口から鋼
片に吹付けられる火炎ガス中の酸素分圧等に因り
局部的に溶削火炎が高輝度となつていても、これ
より高輝度の欠陥火花のみを微分２値化回路で検
出できるので溶削火炎を欠陥火花と誤検出するこ
とがない。更に欠陥火花の検出に微分２値化回路
のみを用いる場合は、高輝度でない部分での瞬時
的雑音による誤検出の可能性があるが、レベル弁
別回路出力との論理積をとることでこのような誤
検出も排除でき、高精度の検出が可能である。 In the case of the present invention as described above, without visual inspection,
Defect inspection can be performed automatically, which saves manpower.Also, since it can be applied to hot metal materials, there is no need to cool down the inspected material as in the past, and there is no loss of thermal energy or time. The efficiency of the maintenance process is significantly improved. Furthermore, since the apparatus of the present invention can quantify defects, data useful for quality control can be accumulated. Since the image signal is processed by a level discrimination circuit and a differential binarization circuit, the distance between the melting nozzle and the steel piece or the partial pressure of oxygen in the flame gas sprayed from the melting nozzle onto the steel piece is determined. Even if the cutting flame is locally high in brightness due to reasons such as this, the differential binarization circuit can detect only the defective sparks with higher brightness than this, so the cutting flame will not be mistakenly detected as a defective spark. Furthermore, if only a differential binarization circuit is used to detect defective sparks, there is a possibility of false detection due to instantaneous noise in areas that are not high brightness, but this can be avoided by performing a logical product with the level discrimination circuit output. It is possible to eliminate false detections and achieve highly accurate detection.
図面は本発明の実施例を示すものであり、第１
図は本発明溶削検査装置の機構部の略示平面図、
第２図は一部を破砕して示す第１図の−線に
よる拡大断面図、第３図は本発明に使用する信号
処理系のブロツク図、第４図イ〜トはその動作説
明のための波形図である。
１……鋼片、３，３′……走行レール、４……
走行台車、６……テレビカメラ、１２……レベル
弁別回路、１３……微分２値化回路、１４……論
理積回路、１５……カウンタ、１７……等級判定
回路。
The drawings show embodiments of the present invention.
The figure is a schematic plan view of the mechanical part of the cutting inspection device of the present invention.
Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1 with a part broken away, Fig. 3 is a block diagram of the signal processing system used in the present invention, and Fig. 4 I to I are for explaining its operation. FIG. 1... Steel piece, 3, 3'... Running rail, 4...
Traveling trolley, 6... Television camera, 12... Level discrimination circuit, 13... Differential binarization circuit, 14... AND circuit, 15... Counter, 17... Grade determination circuit.
Claims (1)
に、金属材の表層部に存する欠陥から発生する欠
陥火花を検知する金属材の欠陥検査装置におい
て、前記金属材との相対移動を可能とした、前記
溶削火炎を撮像する撮像装置と、該撮像装置の出
力信号から所定レベル以上の部分を抽出するレベ
ル弁別回路と、前記出力信号を微分し、微分信号
から所定レベル以上の部分を抽出する微分２値化
回路と、レベル弁別回路及び微分２値化回路の抽
出信号の論理積をとる論理積回路と、該論理積回
路の出力信号に基いて欠陥火花の発生量を定量す
る回路とを具備し、その定量結果に基いて欠陥を
検出することを特徴とする金属材の欠陥検査装
置。1. In a metal material defect inspection device that detects defective sparks generated from defects existing in the surface layer of a metal material when the surface layer of the metal material is melt-cut with a cutting flame, it is possible to move relative to the metal material. an imaging device that images the cutting flame; a level discrimination circuit that extracts a portion above a predetermined level from an output signal of the imaging device; and a level discrimination circuit that differentiates the output signal and extracts a portion above a predetermined level from the differential signal. A differential binarization circuit to extract, an AND circuit that takes the AND of the extraction signals of the level discrimination circuit and the differential binarization circuit, and a circuit that quantifies the amount of defective sparks generated based on the output signal of the AND circuit. What is claimed is: 1. A defect inspection device for metal materials, comprising: and detecting defects based on the quantitative results.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2984583A JPS59154346A (en) | 1983-02-23 | 1983-02-23 | Defect examining method and device of metallic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2984583A JPS59154346A (en) | 1983-02-23 | 1983-02-23 | Defect examining method and device of metallic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59154346A JPS59154346A (en) | 1984-09-03 |
| JPH0411821B2 true JPH0411821B2 (en) | 1992-03-02 |
Family
ID=12287328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2984583A Granted JPS59154346A (en) | 1983-02-23 | 1983-02-23 | Defect examining method and device of metallic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59154346A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2509115B2 (en) * | 1991-09-26 | 1996-06-19 | 新日本製鐵株式会社 | Surface slab surface defect detection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419798A (en) * | 1977-07-14 | 1979-02-14 | Ishikawajima Harima Heavy Ind | Crack detecting method |
-
1983
- 1983-02-23 JP JP2984583A patent/JPS59154346A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419798A (en) * | 1977-07-14 | 1979-02-14 | Ishikawajima Harima Heavy Ind | Crack detecting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59154346A (en) | 1984-09-03 |
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