JPH07290352A - How to care for surface defects on metal pieces - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a method for caring for a surface defect portion of a metal piece, in which the surface defect portion is accurately recognized and reliably removed by grinding when the surface defect portion of the metal piece is cared for. [Arrangement] A grinding range display frame is arranged at a surface defect portion discovered by artificially inspecting the surface of a metal piece, and a defect display plate in which a defect type and a grinding depth are displayed in characters in the immediate vicinity of the grinding range display frame. , The grinding range display frame and the defect display plate are photographed with a TV camera, the grinding range, defect type, and grinding depth are read by a mark reader based on the signals, and maintenance is performed via the maintenance controller. The machine is instructed to grind the surface defects of the metal piece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a surface defect portion of a metal piece.

[0002]

2. Description of the Related Art As a method of cleaning a surface defect portion of a metal piece, a pattern and a color classified according to the position, range, type and depth of the defect portion are marked on the metal surface, and this mark is applied to a control computer. Japanese Patent Publication No. 54-30390 discloses that a defective portion on a metal surface is automatically ablated by controlling the ablation nozzle machine based on the input and classification. Further, in Japanese Examined Patent Publication (Kokoku) No. 5-75489, marking is made on the material to be marked, and it is judged whether or not the marking is surely made. It is disclosed that the amount of paint discharged is increased for accurate marking.

[0003]

However, in the case of repairing a defective surface of a metal piece such as the former, there is no device capable of accurately recognizing all the figures and the like arranged on the defective surface of the metal surface. Recognition rate is 10
It cannot be 0%, so that there are drawbacks such as reduction of product yield and deterioration of product quality.

Further, in the latter case, the surface of the material to be marked is marked, and in the case of a defective mark, marking is performed by a marking adjustment command. However, there is no means for correcting the marked material which has been marked. However, there is a problem that processing trouble may occur due to misrecognition due to defective marks. The present invention has been made in order to advantageously solve such a problem, while providing a display of the defect portion that can surely recognize the defects on the surface of the metal piece, if it can not be accurately recognized, It is an object of the present invention to provide a method for repairing and removing a defective portion by making a correction as perceived by.

[0005]

A feature of the present invention is that a grinding range display frame is arranged at a surface defect portion discovered by artificially inspecting the surface of a metal piece, and the grinding range display frame is Place the defect display plate that displays the defect type and grinding depth in the immediate vicinity, and then take a picture of the grinding range display frame and the defect display plate with the TV camera and use the signals to grind the grinding range, defect type, and grinding. The present invention relates to a method for cleaning a surface defect portion of a metal piece, which comprises reading the depth with a mark reader and then instructing the maintenance device through a maintenance controller to grind the surface defect portion of the metal piece.

[0006]

According to the present invention, first, in order to make sure that the mark reader can recognize the surface defect portion of the metal piece, the grinding range display frame is arranged on the surface defect portion from the inspection result to clarify the range of the surface defect portion. By doing so, the surface defect portion can be reliably captured by the image capturing by the television camera, and the recognition of the surface defect portion by the mark reader connected to the television camera can be easily and accurately captured. The grinding range display frame may be a frame prepared in advance or may be displayed by hand marking. At the same time, in the immediate vicinity of the grinding range display frame, defect types, for example, cut T, pinhole P, inclusion K, crack W, point defect S, area defect H, and other E are classified and classified by type. In addition to those that are symbolized with letters such as alphabets and numbers that show the grinding depth,
A defect display plate with characters is placed on the surface defect. Note that these symbols are generally displayed by hand marking. It is preferable that the grinding range display frame and the defect display plate have a white system (for example, made of aluminum) that can be clearly photographed by a television camera. Further, it is preferable that the grinding range display frame can be freely expanded and contracted depending on the size of the surface defect portion. It should be noted that, as the shape of the frame, it is optimal that the grinding wheel can be easily moved by grinding and that the shape can be changed to a square or a rectangle so that the grinding can be performed quickly and accurately. Further, as the defect display plate, for example, in the case of caring for a steel slab, it is preferable that the surface is matte black and the characters are white. As described above, the defect types are classified and displayed, and the mark reader recognizes the defect types and the grinding depth, and inputs these to the high-level production control computer, for example, to control the occurrence of defects, and also to enter the maintenance results. Therefore, it is also used for maintenance result management and used as quality control data.

Next, since the depths of the defects as described above are individually changed, they are indicated by the grinding depth. How many times to grind to that depth is determined by a grinder (eg grinder).
Judge on the side. For example, in the case of ultra low carbon steel slab,
Since it is substantially uniform, the grinding depth (amount) may be a constant amount, and a constant grinding amount may be stored. However,
Since the amount of grinding per one time becomes small in high carbon steel, special steel, etc., the grinding machine side grinds to the predetermined depth by increasing the number of grindings, as instructed by the grinding depth.

In this way, after the artificial display of the grinding range display frame and the defect type and the grinding depth character display on the surface defect portion of the metal piece, or after hand marking,
Then, it is taken with a TV camera and guided to a mark reader. In this mark reader, when the reliability of the mark reading is low, for example, when the recognition of the grinding range display frame, the character recognition of the defect display plate and the hand marking are inaccurate or abnormal, an alarm is issued and inspection is performed. It is corrected by the correction device by the staff. This correction device stores an original image in which the surface defects are marked, displays it on the correction device cathode ray tube when the reading is inaccurate or abnormal, and displays the original image and the read image in an overlapping manner for easy and easy operation. It can be corrected accurately, and the result of this correction is input to the mark reader.

Next, in the mark reader, the defect type and the like are input to the computer for high-level production control, and at the same time, to the maintenance controller, and in the maintenance controller, the metal piece contact length and width of the grindstone which is the maintenance device. Also, the grinding direction (grinding range display frame shape or hand marking shape), the grinding direction, the grinding speed, the number of times of grinding wheel reciprocation, etc. are determined based on the size of the grinding range, etc. And surely grind the surface defect portion.

In order to grind the surface defective portion of the metal piece, the entire surface within the grinding range is ground by reciprocating grinding within the grinding range several times with a grindstone (a grinder, etc.) of a maintenance device. Therefore, the grinding range is as described above. It is preferable to set a rectangle or a square by a display frame or hand marking. In the case of a rectangle, by moving the grindstone in the long side direction and grinding, the number of times of changing the grinding position is smaller than that in the moving grinding in the short side direction, and the grinding time can be shortened. On the other hand, in the case of a square, the number of times the grinding position is changed is the same for both horizontal and vertical grinding, but it is determined based on the running of the grinder (grinder, etc.) and the acceleration / deceleration control function difference of the traverse. Traverse grinding is efficient for.

[0011]

EXAMPLE An example of the method of the present invention will be described below using the illustrated apparatus. In FIG. 1, first, a grinding range display frame 3 and a defect display plate 4 for each defect type are placed on a surface defect portion 2 of a metal piece 1 by placing a frame or plate prepared in advance, or by hand marking with a choke 15. Place by displaying with. Next, the television camera 5 photographs the portion surrounded by the grinding range display frame 3 and the portion of the defect display plate 4 for each defect type, and inputs it to the mark reader 6. By this input, the mark reader 6 recognizes it, determines the grinding range and the grinding order when there are a plurality of grinding points, and inputs the result to the upper production control computer 7 and at the same time to the maintenance controller 8. Then, the grinding position, speed, grinding direction, grinding reciprocation number, grinding distance, etc. are instructed to the care device 9, and based on this, the care device 9 moves the grindstone 10 to the surface defect portion 2 within the grinding range of the metal piece 1. Position it, grind away, and clean it. The mark reader 6
When the input from the TV camera 5 is incorrect or abnormal, the alarm is issued from the alarm device 12 at the same time as input to the correction device 11, and the inspector is notified and the inspector displays the marked original image on the correction device 11. , The read image is superimposed and displayed, the read image is corrected along with the original image and input to the mark reading device 6, and the result is input to the upper production control computer 7 and the maintenance controller 8, The maintenance device 9 is instructed. The data input to the higher-level production control computer 7 is stored and used as quality control data.

Next, an example of the grinding range display frame 3 will be described with reference to FIG. By inserting the four connecting middle frames 14 into the four key-shaped outer frames 13, the middle frames 14 can be slidably inserted, extracted, and expanded / contracted, depending on the distribution of defective portions. The shape of the square or rectangle can be changed to a square or rectangle, and the size of the square or rectangle can be arbitrarily formed.

Next, an example will be given in which the grinding range display frame 3, the defect display plate 4 and the like are arranged on the surface defect portion 2 of the metal piece 1. Figure 3
In the above, the inspector indicates that the surface defect portion 2 of the metal piece 1
Is recognized, and the chalk 15 is attached to the surface defect portion 2 as shown by b.
Etc., then, as shown in c, grinding range display frame 3
Then, the defect display plate 4 is arranged in the immediate vicinity of the grinding range display frame 3, and the surface defect portion 2 is cared for as shown in FIG. In addition, in the small surface defect part 2 etc., the grinding range display frame 3
It is possible to omit the arrangement of the defect display plate 4.

[0014]

According to the present invention, the position of the surface defect portion can be accurately recognized by the grinding range display frame, and the defect type and the like can be accurately recognized by the defect display plate.
The surface defect portion of the metal piece can be surely removed by grinding, so that the quality can be remarkably improved. Further, when the mark reading is inaccurate by hand mark or the like, the surface defect portion can be accurately recognized by the correction, which is excellent in that the grinding removal of the surface defect portion of the metal piece can be further improved. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a grinding range display frame used in the present invention.

FIG. 3 is an explanatory view showing an embodiment of the arrangement of a grinding range display frame and a defect display plate on a surface defect portion of a metal piece and hand marking display according to the present invention.

[Explanation of symbols]

 1 Metal Fragment 2 Surface Defect 3 Grinding Area Display Frame 4 Defect Display 5 TV Camera 6 Mark Reader 7 Higher Production Control Calculator 8 Maintenance Controller 9 Maintenance Device 11 Correction Device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyasu Mitsuoka 5-3 Tokai-cho, Tokai-shi, Aichi Pref.Nippon Steel Works (72) Inventor Toru Kakuhari 12 Nakamachi, Muroran-shi, Hokkaido Nittetsu Hokkaido Control System Co., Ltd.

Claims (3)

[Claims] 1. A defect in which a grinding range display frame is arranged at a surface defect portion discovered by artificially inspecting the surface of a metal piece, and a defect type and a grinding depth are displayed in characters in the immediate vicinity of the grinding range display frame. After arranging the display board, the television camera takes a picture of the grinding range display frame and the defect display board, and based on the signals, the grinding range, the defect type and the grinding depth are read by the mark reader and the maintenance controller. A method for cleaning a surface defect portion of a metal piece, which comprises instructing a maintenance device through the tool to grind the surface defect portion of the metal piece. 2. The method for cleaning a surface defect portion of a metal piece according to claim 1, wherein character display of a defect type and a grinding depth of the grinding range display frame and the defect display plate is performed by hand marking. 3. An alarm is issued when the reliability of the recognition result of the grinding range, the kind of defect, and the grinding depth guided to the mark reader based on the signal captured by the TV camera is low, and the result is artificial. The method for repairing a surface defect portion of a metal piece according to claim 1 or 2, wherein the correct defect information is corrected by a correction device based on the original image and is guided to a mark reader.