JPS59174275A - Scarfing and mending device for metallic material - Google Patents

Abstract

PURPOSE:To scarf away automatically the defective part on the surface of a metallic material in the stage of removing by scarfing the defective part on the surface of the metallic material by detecting the spark in the defective part owing to radiation of a scarfing flame with an image pickup device and moving a scarfer to the defective part according to the result thereof. CONSTITUTION:While a metallic material 1 such as a steel billet or the like is conveyed on rollers 2 in an inspection part A, a flame is injected from a scarfer 5 attached to a traveling carriage 4 movable on traveling rails 3 atop the material and the luminance thereof is taken with a television camera 6. The operation is performed over the entire surface of the billet 1 and the defective spark generated in a defective part such as slag inclusion, pinhole or the like is detected. The billet 1 is then fed to a scarfing and mending part B, where a conveying roll 2' and a geared motor 10 for driving are controlled by the detection signal of said defective spark to adjust the conveying speed of the billet 1; at the same time, the defective part is automatically scarfed away by a scarfer 9a in the part B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solvent cleaning device for metal materials, and specifically, a solvent for automatically removing surface defects such as slag, pinholes, and sand stains existing on the surface of metal materials. This paper proposes a care device.

Conventionally, a worker holding a manual solvent torch positions himself on the surface of a steel billet, applies a solvent to the surface of the steel billet, and removes defects in the surface layer. The generation fft of high-brightness sparks was visually observed through dimming glasses, and the solvent was removed more deeply from areas where a large amount of sparks were generated. However, when using this method, the posture of the worker performing the solvent treatment is poor and the fatigue is severe, and it cannot be applied to hot-worked steel slabs. After that, it is necessary to reheat and hot-roll, which causes a large loss of heat energy and time, and furthermore, the result of the above work! Sometimes it turns out that there is no defect in the i14RM piece, and in this case, there are problems such as a lot of wasted time and efficient maintenance. In addition, maintenance work using this method depends on the operator's experience and J.
! i! Since the process is carried out by +, there is a problem that there are large individual differences and it is not possible to perform even care.

The present invention has been made in view of the above circumstances, and utilizes defect sparks generated from defects existing in the surface layer of the steel piece when the tip surface + S part is treated with a solvent flame to remove defects. It is an object of the present invention to provide an automatic solvent cleaning device δ that achieves f1 efficiency of cleaning work and uniformity of cleaning by performing constant electricity and pinpointing defect positions.

The present invention will be described below with reference to drawings showing embodiments thereof. Figure 1 shows the structure of the solvent cleaning device according to the present invention.
FIG. 2 is an enlarged cross-sectional view taken along the line II--II of FIG. 1, partially broken away. The solvent treatment device includes a mechanical section A of the d cutting inspection section installed on the downstream side in the conveying direction of the steel billet 1 (hereinafter, the solvent inspection section installation side will be referred to as the upstream side) and a signal processing system (third (see figure), a mechanism part B of the solvent handling part installed on the downstream side, and a control system connected to this (see figure 3).

The steel billet l is conveyed by a roller conveyor consisting of conveyor rolls 2, 2, . . . with its longitudinal direction perpendicular to the extending direction of the conveyor rolls 2, 2, . At a position slightly away from the shaft end of the conveyor roll 2゜2, running rails 3, 3 are installed in parallel and oppositely at right angles to the extending direction of the conveyor roll 2゜2. Fixed mounting plates 3a, 3a, 3a, 3
It is fixed onto a base (not shown) via a. Both of the running rails 3 and 3' have convex cross sections, and a rack 3b is formed at the top of one of the running rails 3 over its entire length in the longitudinal direction. These running rails 3
．． A traveling carriage 4 is placed on the traveling rails 3 so as to be movable in the longitudinal direction of the traveling rails 3, 3. The running trolley 4 is a box body that is long in the direction in which the transport rolls 2, 2, . A geared motor 7 is attached to its outer surface so that the output shaft 7a is inserted therethrough.

A pinion 7c is fitted in the center of the output shaft 7a inserted into the carriage width 4, and an opening is provided on the lower surface of the carriage 4 located below the pinion 7c.
A part of the circumferential surface of the rack 3 is exposed from this 060 part.
It meshes with b. Further, a pulse generator 7b has its rotating portion fastened to the tip N of the output shaft 7a, and is fixed within the traveling carriage 4 by means not shown. The pulse generator 7b outputs a number of pulses according to the rotation angle or rotation speed of the guard motor 7, that is, the amount of change in the position of the traveling carriage 4 that is moved on the traveling rail 3°3 by the rotation of the guard motor 7. . This output pulse is input to a central processing unit 20, which will be described later.

Wheels (not shown) that engage with and roll on the traveling rail 3 are attached to the lower surface of the traveling carriage 4 facing the traveling rail 3'. A central portion in the longitudinal direction of the traveling trolley 4,
A solvent container 5 whose tip end is inclined downward toward the steel billet I is inserted and fixed to the side wall of the traveling cart 4 located on the upstream side. On the upper surface of the traveling trolley 4, which is a suitable distance away from the fixing position of the solvent container 5 toward the traveling rail 3, the optical axis of the vehicle is placed so as to face the area where the solvent flame from the solvent container 5 is radiated onto W (one side L). A television camera 6 is fixed, and a light reduction filter 6a is attached to the optical part of the television camera 6.
is installed.

The solvent test controller 8 is an electric circuit that controls the forward/reverse rotation and stop of the guard motor 7 and the ignition and extinguishing of the solvent container 5, respectively.When a solvent test start command signal is given from an operation section (not shown), the running trolley starts. 4 in the longitudinal direction of steel billet 1 -
The guard motor 7 is rotated in the normal direction to move it from one side to the other, and the solvent container 5 is ignited. Then, when a solvent test stop signal is given, the guard motor 7 is stopped, the solvent container 5 is extinguished, and the guard motor 7 is reversed to cause the traveling cart 4 to be sent backward.

Next, the mechanism section B of the solvent handling section will be explained.

The steel piece 1 that has been inspected for defects in the solvent inspection section mentioned above is transferred to the mechanical section B of the solvent handling section by conveyor rolls 2, 2..., 2.
It is sent to installation position 1. Solvent containers 9a, 9 in the maintenance section
a..., 9 a are attached to the upstream side wall of a gate-shaped pedestal 9 constructed so as to straddle the conveyance area of the steel billet 1, separated from each other by an appropriate length l1jt+. These solvent vessels 9a,
9a..., 9a is a piece of steel lOI at the crater! The number and separation distance are selected so that t6 cutting can be performed over the entire length of the steel billet in the width direction. A geared motor IO for adjusting the feed speed of the steel billet 1 is connected to the drive shaft of the conveyance roll 2 disposed near the upstream side of the installation fβ position of the frame 9. Guard motor lO
The number of revolutions is controlled by a signal from a drive control path 22, which will be described later, and the transfer speed of the steel piece 1 in the mechanism section B of the solvent handling section is adjusted. One rotating shaft in the gear box of the guard motor 10 protrudes from the gear box, and the rotating part of the rotary encoder 10a is connected to the leading end thereof. The low rotation encoder 10a outputs a number of pulses according to the rotation angle or rotation speed of the guard motor 10, that is, the transfer speed of the steel billet 1 transferred by the rotation of the guard motor 10, or the amount of change in the position in the transfer direction. . This output pulse is input to a central processing unit 20, which will be described later.

A light emitting element 11a and a light receiving element 11b are provided above the conveying roll 2 to detect the steel piece 1 passing over the conveying roll 2.
A photosensor consisting of is arranged. The output of the light receiving element 11b of the photosensor is given to the central processing unit 20.

FIG. 3 is a block diagram showing the signal processing system of the solvent testing section and the control system of the solvent handling section, and FIG. 4 is a signal waveform diagram for explaining the operation of the signal processing system.

The television camera 6 detects the surface i'i of the steel billet 1 from the solvent vessel 5.
[02. sprayed against r. It is provided to image sparks (hereinafter referred to as defective sparks) that are higher in brightness than the solvent flame that occurs when a defect exists in the surface layer of the solvent flame and the steel billet 1 made of a mixed gas such as C2H2, The captured image is scanned by a vertical synchronizing signal and a horizontal synchronizing signal given from a synchronizing signal generator 12, and is given as an image signal to a level discrimination circuit 13 and a differential binarization circuit 14. FIG. 4(a) schematically shows one scanning line segment of the image signal, and the level discrimination circuit 13 has a threshold value (indicated by a dashed-dotted line) at a level slightly 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. 4 (b) is generated which becomes high level. is applied to one input terminal of the AND circuit 15. The differential binarization circuit 14 first differentiates the image signal and converts it into a fourth
Obtain a differential signal as shown in Figure V → and apply it to a predetermined threshold value (
A pulse signal as shown in FIG. 4) is applied to the other input terminal of the AND circuit 15, which becomes high level when the differential signal is at a level higher than the threshold value. : The threshold value of the component biadultization circuit 14 is set to a value slightly lower than the differential clarity corresponding to the level change of the image signal due to defective sparks. The AND circuit 15 outputs a pulse signal as shown in FIG. 4(E) which becomes high level when both pulse signal inputs are high level, and supplies this to the counter 16 as a counting enable signal.

Since the image signal of the portion corresponding to the defective spark in the captured image rises steeply and shows a high instantaneous value, the level discrimination circuit 13,
Corresponding pulses appear in both output pulse signals of the differential binarization circuit 14. On the other hand, the high-intensity part of the flame [portion A in FIG. Since the change in is slow, the output of the differential binarization circuit 14 of the corresponding part becomes a low level, and in the end, the AND circuit outputs the number of pulses having a time width corresponding to the size of the defective spark. That will happen.

The counter 16 receives a clock pulse whose frequency is sufficiently higher than the time width of the pulse signal output from the AND circuit 15 [Fig.
)] is given as a counting object from the oscillator 17, and the counter 16 counts this clock pulse as shown in FIG. 4(g) while the output of the AND circuit 15 is at a high level. Vertical synchronization signal of synchronization signal generation *12 is grade judgment circuit 1
8 as a timing signal for reading the count value of the counter 16, and also as a clear signal to the counter 16. Therefore, the counter 16 counts the number of clock pulses related to the number and size of defective sparks in one field of the image captured by the camera 6 to quantify the amount or degree of defective sparks generated. This count value is given to the grade determination circuit 18. The grade determination circuit 18 compares the output signal from the counter 16 with a plurality of preset comparison reference values, and centrally processes signals indicating the necessity of solvent and the depth of solvent treatment for each field of the captured image. Output to the device 20.

The central processing unit 20 determines the position of the steel piece 1 in the solvent inspection section,
The conveyance speed of the steel slab 1 in the solvent handling section is determined based on the input information of the necessity of cleaning and the depth, and the control is performed to achieve this. 1. The above-mentioned solvent inspection start command signal is sent to the central processing unit. 20, and the central processing unit 20 starts counting the output pulses of the pulse generator 7b from this point on, and uses the count value at the time when the output signal from the grade determination circuit 18 is input. , the handling position in the longitudinal direction of the steel piece 1 is specified, and the corresponding material stores in the memory 21 the counted value and the signals of the necessity of handling and the depth given from the grade determination circuit 18. Then, when the solvent test stop command signal is input, the processing for one steel billet 1 is completed. As a result, in the memory 21, information on the position of the steel billet 1 imaged by the television camera 6 and maintenance information corresponding to defects in the imaged image are stored in association with each other. Then, the steel piece 1 that has been subjected to the solvent test is transferred to the installation position of the mechanical part B of the solvent handling part in the subsequent process.

The central processing unit 20 discriminates between the steel pieces that do not require solvent treatment and those that do, from the data stored in the memory 21, and the steel pieces that do not require solvent treatment are placed in the solvent treatment section machine 114. When transferred to section B, a predetermined signal is issued to the drive control circuit 22 of the guard motor 10 to cause the guard motor 10 to rotate at a relatively high speed, and the product is transferred directly to the subsequent process. On the other hand, when the 'A4 piece that requires solvent treatment is transferred to the mechanism section B of the solvent treatment section, the tip detection signal of the steel piece input from the light receiving element 11b of the photosensor is detected. When received, it starts counting the output pulses of the rotary encoder lOa, and also controls the rotation speed of the guard motor 10 and the solvent dispensers 9a, 9a.
..., 9a is ignited. Solvent container 9a.

The control of ignition and extinguishing of 9a--, 9a is performed by issuing a control signal from the central processing unit 20 to the solvent type control circuit 23. This will start the solvent treatment, but
The central processing unit 20 compares the count value of the output pulses of the rotary encoder 10a with the data in the memory 21 to determine the cleaning depth corresponding to the position on the steel piece 1 that is hit by the solvent flame from the solvent dispenser 9a. In other words, a control signal is issued to the drive control circuit 22 to change the speed at which the steel billet 1 is transferred by the conveyor roll 2' to a high or low level in accordance with the shallowness of the cleaning depth. The drive control circuit 22 consists of a D/A converter, etc., and has a control circuit 11 for the guard motor lO.
Issue a speed signal. When the central processing unit 20 receives a signal from the light receiving element 11b of the photosensor that detects the passing of the rear end of the steel billet 1, it issues a constant signal to the drive control circuit 22 and the solvent type control circuit 23. The rotational speed of the motor 10 is returned to a predetermined rotational speed, and the solvent dispensers 9a, 9a are
..., extinguish the flame at 9a.

In the above-described embodiment, the defect inspection by the solvent inspection section is carried out on the central part in the width direction of the steel billet 1 which is exposed to the flame radiation from the solvent vessel 5, but this part does not detect defects in the longitudinal direction of the steel billet 1. Since the distribution is representative, the solvent treatment in the solvent treatment section is made to be uniform over the entire width.

In addition, in the above-described embodiment, the solvent inspection section was configured to use a traveling trolley to test the solvent on the steel pieces placed on the conveyor rolls, but the solvent tester and television camera for inspection were fixed, and the steel pieces were placed on the conveyor rolls. In the above-mentioned embodiment, the solvent cleaning part is fixed on the frame and the cleaning solvent device is used to perform the cleaning with the solvent. It is also possible to have a configuration in which the conveyance of the steel piece is stopped and the maintenance solvent machine is run.

Furthermore, the depth of cleaning does not depend on the relative moving speed between the solvent vessel and the steel billet, but may depend on the size of the solvent flame from the solvent vessel.

Furthermore, it is also possible to configure the device so that the solvent container for defect inspection and the scraper for cleaning are shared.

As detailed above, the present invention apparatus includes an inspection solvent device that emits a solvent flame onto the surface layer of a metal material in order to detect defects;
a device for imaging the solvent flame that can move relative to the metal material; a signal discrimination circuit for discriminating components related to defective sparks generated from the defect from an output signal of the imaging device; and the No. 4a discrimination circuit. a defect quantification circuit that quantifies the amount of defective sparks generated based on the output signal of the metal material; a detector that detects the relative position of the imaging device and the metal material; It is equipped with a calculation means for determining the position of the defect and the degree of cleaning, and a cleaning solvent container that can be moved relative to the metal material, and the cleaning solvent container is driven and controlled based on the calculation result of the calculation means. Since the new structure allows defects to be detected and solvent cleaning to be performed automatically without the need for visual inspection, it is possible to save labor, and since it can also be applied to hot-worked steel pieces, there is no need to use conventional methods. Since there is no need to cool the test material once, there is no loss of thermal energy, and there is no wasted time between the solvent inspection process and the solvent cleaning process (you can enjoy a high rate of solvent cleaning, etc.) The present invention has excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic plan view of the mechanical part of the solvent cleaning device according to the present invention, and FIG. 2 is a partially fragmented view of FIG. 1. 3 is a block diagram showing the signal processing system of the solvent inspection section and the control system of the solvent handling section, and FIG. 4 is a signal waveform diagram for explaining the operation of the signal processing system. It is. 1... Steel piece, 2, 2... 2, 2...
Transport roll, 3.3... Traveling rail, 4... Traveling trolley, 6... Television camera, 7, 10... Guard motor, 7b... Pulse generator, 9a, 9a... 9a ...Solvent container for cleaning, 10a...
- Rotary encoder, 11a... Light emitting element of photosensor, 11b... Light receiving element of photosensor, 13... Level discrimination circuit, 1
4... Differential binarization circuit, 15... AND circuit,
16... Counter, 18... Grade determination circuit, 20...
...Central processing unit. Patent Applicant Sumitomo Metal Industries Co., Ltd. Representative Patent Attorney Noboru Kono Fudo Trap 1 (B a Trap 2 Figure. ~, -111111#1lII Garden----- Construction 4
figure

Claims (1)

[Scope of Claims] 1. In a metal material solvent cleaning device that detects defects existing in the surface layer of a metal material and removes the solvent with flame, a solvent flame is applied to the surface layer of the metal material in order to detect defects. An inspection solvent container that emits radiation, an imaging device that images the solvent flame that is movable relative to the metal material, and detects components related to defective sparks generated from the defect from the output signal of the imaging device. a signal discrimination circuit for discriminating; a defect quantification circuit for quantifying the amount of defective sparks generated based on the output signal of the signal discrimination circuit; a detector for detecting the relative position of the imaging device and the metal material; It is equipped with a calculation means for determining the position of a defect in a metal material and the degree of maintenance based on the output of a device and a defect quantification circuit, and a cleaning solvent container that can be moved relative to the metal material, and the calculation means A solvent cleaning device for metal materials, characterized in that the cleaning solvent device is driven and controlled according to the results.