CN115494075A - Online detection system and method for roll mark defects on surface of cold-rolled sheet - Google Patents
Online detection system and method for roll mark defects on surface of cold-rolled sheet Download PDFInfo
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- CN115494075A CN115494075A CN202211289667.9A CN202211289667A CN115494075A CN 115494075 A CN115494075 A CN 115494075A CN 202211289667 A CN202211289667 A CN 202211289667A CN 115494075 A CN115494075 A CN 115494075A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to an online real-time detection method for roll mark defects on the surface of a cold-rolled sheet, which is characterized in that a swing arm type mechanical arm is arranged above a moving strip steel, the moving strip steel is polished in a polishing mode through the swing arm type mechanical arm to display the roll mark defects on the surface of the strip steel, a set of ash wiping devices are arranged on the surface of the polished strip steel to wipe off the polishing ash on the surface of the strip steel, a machine vision system is adopted to collect images of the polished strip steel surface, the polished images are analyzed line by line to identify the roll mark defects displayed after polishing and displayed in a detection picture, and meanwhile, the computer stores the surface images obtained by polishing in a computer so as to further screen the defects on the surface of the strip steel. By adopting the detection method, the workload of manual defect screening can be greatly reduced, the defect detection efficiency is improved, and the surface quality of the cold-rolled sheet is improved.
Description
Technical Field
The invention relates to a detection system and a detection method, in particular to an online detection method for roll mark defects on the surface of a cold-rolled sheet, and belongs to the technical field of production of automobile sheets in the metallurgical industry.
Background
The cold-rolled sheet is widely applied to industries closely related to the life of people, such as automobiles, household appliances and the like, and along with the improvement of the living standard of people, people put forward higher requirements on the quality of products. The production process of the cold-rolled sheet is complex, the steel strip is subjected to rolling in the rolling process, once sundries adhere to the surfaces of various rollers, the sundries leave roller marks on the surface of the steel strip, and the rolled steel strip is subjected to degreasing, annealing, finishing and other processes. Once the cold-rolled sheet with roll mark defects is used as the shell of automobile and household electrical products, obvious bright spots or black spots are formed after painting, and users will disagree on the quality improvement of the products, thereby causing great solution loss. For the production enterprises of cold-rolled sheets, because the production rhythm is fast, once the defects of roll marks are found, the rollers with foreign matters on the surfaces must be found in time, and huge economic loss is avoided.
The roll mark type defects generally mean that tiny bulges or depressions (including roll marks, vibration lines, surface foreign matters and the like) exist on the surface of the strip steel, the physical height of the defects is only a few micrometers, the defects are usually difficult to distinguish by naked eyes, and a traditional vision system is beyond the limits. The only available method for detecting the defects at present is to polish the surface of the strip steel by adopting a special oilstone in a polishing way, wherein uniform polishing marks are formed on the surface of the strip steel, bright spots which are convenient to identify are formed once the surface of the strip steel has convex roll marks, and black spots are formed if the surface of the strip steel has concave roll marks. As the diameters of the rollers of the production line are fixed for the production enterprises of the cold-rolled sheets, the problems of the rollers of the type on the unit can be roughly judged by checking the periodicity of the roller marks, and the faults on the surfaces of the rollers can be eliminated in time.
At present, the inspection of the roll mark defects on the surface of the cold-rolled plate at home and abroad is realized by adopting a manual polishing and grinding mode, an operator holds a grinding oilstone to polish and grind the surface of the whole plate, and the operator can observe the whole plate while grinding the whole plate so as to discover the defects in time. For a cold-rolled sheet production factory, in order to set defects, the distance of 2 times of the maximum roller circumference of a unit is required to be ground regularly, and two operators are respectively positioned at two sides of strip steel to carry out grinding and defect setting. Obviously, the method for identifying the defects by polishing and grinding not only has large labor workload and low efficiency, but also has artificial factors and often appears the condition of missing detection. The polishing mode becomes an important factor for restricting the performance of the unit capacity, and the performance of the unit capacity is limited.
The difficulty of identifying the roll mark defects on the surface of the strip steel has the following three points: 1) The defect has different sizes and is represented by area and height, and some small roll marks have the area of only 1mm 2 However, the physical height of the defect is typically only on the order of microns; 2) Some roll mark defects are located on the subsurface of the material (e.g., galvanized sheet); 3) The surface of the plate is usually provided with a certain degree of unevenness (wave shape). Aiming at the characteristics of the roller mark defects, the conventional detection method usually comprises the step of manually stopping or sampling for detection, wherein the detection method comprises the step of slightly polishing the surface of a plate by manually holding special polishing oilstones in a hand, and the defect can not be detected without stopping while polishing and observing. An automatic defect detection system is adopted, the problem of polishing uniformity is solved, and the polishing oilstone can be required to be adaptive to the shape of the surface of the strip steel under the condition of small pressure to ensure uniform polishing; secondly, the polished image is required to be capable of filtering polishing traces; the polishing dust formed after polishing can be automatically removed without affecting the surface quality of the plate and the image identification effect.
In view of the lagging mode of the detection of the roller mark defects on the surface of the current strip steel, the intelligent polishing and grinding of the surface of the strip steel, automatic surface ash wiping, automatic acquisition of images of the surface of the strip steel are provided on the basis of fully mastering the polishing and grinding requirements required by defect identification, the defects on the surface of the strip steel are detected by a method of machine vision and manual discrimination, the detection of the roller mark defects on the surface of the strip steel in online operation is realized, the detection rate and the detection effect of the defects are greatly improved, the intelligent manufacturing level of the cold-rolled sheet manufacturing is improved, the detection efficiency of the roller mark defects is greatly improved, the detection time is shortened, the unit productivity is improved, and the product quality is improved.
Disclosure of Invention
The invention provides an on-line detection method for roll mark defects on the surface of a cold-rolled sheet, aiming at the problems in the prior art, and realizes the detection of the roll mark defects on the surface of strip steel under the condition of strip steel operation.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides an on-line measuring system of cold-rolled sheet surface roll mark class defect which characterized in that, detecting system includes belted steel surface polishing system of polishing, belted steel surface ash wiping system and belted steel surface image detecting system, and detecting system installs on the production line of unit, under the condition of belted steel crawling speed, realizes the detection of belted steel surface roll mark class defect.
The strip steel surface polishing and grinding system comprises a gantry frame, a movable guide rail, a worm gear speed reducer, a servo motor, a transmission shaft, a swing arm, a cylinder, a flexible grinding head, a permanent magnet and grinding oilstone, the whole grinding machine is installed on the fixed gantry frame, the movable guide rail is arranged on the gantry frame, the grinding machine is driven by the servo motor, the servo motor passes through the worm gear speed reducer, the swing arm (with the length of 500 mm) is installed on an output shaft of the worm gear speed reducer, the head of the swing arm is connected with the cylinder, the flexible grinding head is connected below the cylinder and is connected with the grinding oilstone through the permanent magnet, the length L =150mm of the grinding oilstone, the initial positions of two groups of grinding swing arms are horizontal, the swing arms contract to the inside of two supports at 180 degrees, and the strip steel cannot touch the grinding head when the unit operates at normal speed and under the condition of strip steel shaking.
As an improvement of the invention, in order to ensure that the grinding oilstone can keep flexible and close contact with the strip steel, a plurality of groups of springs are arranged in the flexible grinding head, and the grinding head has omnibearing flexibility by combining with a cylinder connected with the springs, thereby ensuring that the grinding head can be adaptive to the shape of the strip steel surface. In order to achieve the required polishing effect, the contact force between the polishing head and the strip steel is usually 1-3kgf, the polishing force is adjusted by adjusting the working pressure of an air cylinder under the condition of certain polishing head structure, and the working pressure of the air cylinder is 0.5-2kg/cm 2 ；
The grinding oilstone is a component which is contacted with the strip steel, and comprises a soft steel sheet, a support frame, a polyurethane elastomer (30-50 mm thick) and an abrasive material (a disc-shaped or strip-shaped oilstone strip). In order to ensure the suction force of the flexible polishing head and the polished oilstone, the thickness of the soft steel sheet is 1-2mm, in order to ensure that the polished oilstone has certain elasticity, the thickness of the polyurethane material is 30-50mm, the hardness of the polyurethane material is 30-60A, the grinding material adopts a disc-shaped or strip-shaped grinding material, the thickness of the disc-shaped or strip-shaped grinding material is 5-10mm, the material is corundum or silicon carbide, and the fineness of the grinding material is 500-800 meshes.
As an improvement of the present invention, in the polishing process, the polisher is stationary, and the strip moves forward at a certain speed (n 2, unit: mm/min), and the polishing traces on the strip surface during the polishing process are shown in FIG. 5. To realize the polishing of the whole board surface, the polishing arm swings back and forth by an angle A, and the swing speed (n 1, unit: (degree/min)) of the swing arm is not less than:
n1≧A×n2/2L
the width scope that the swing arm back and forth swing once can cover belted steel among the polishing process does: r × sin (A/2).
As an improvement of the invention, the image acquisition system comprises a bracket, 4 line group cameras, a line light source with the length of 1800mm and a set of lifting mechanism, wherein the 4 line group cameras are arranged on the bracket, and the lifting mechanism is arranged on one side of the bracket. As the distance between the light source and the strip steel is required to be 300 +/-10 mm during image detection, and the light source is required to be at least 500mm away from the strip steel in non-detection time, a set of lifting mechanism is additionally arranged for the system, so that the position between the light source and the strip steel is variable.
The polishing dust remaining on the surface of the strip steel after polishing is erased by the dust wiping mechanism, and the structure diagram 6 of the dust wiping mechanism shows that the swinging direction of the dust wiping mechanism is the reverse direction of the movement of the strip steel. In order to not affect the normal production of the unit, the ash wiping rod is positioned in a position parallel to the strip steel, when the ash is required to be wiped, the ash wiping rod swings to a position vertical to the strip steel through the rotary air cylinder, the ash wiping rod is pressed down through the air cylinder, and the ash wiping rod is in close contact with the surface of the strip steel through the flexibility of the ash wiping rod and the ash wiping cloth on the ash wiping rod. The working mode is as follows: after the polishing and grinding machine is put into use, the ash wiping rod swings to a position vertical to the strip steel, the ash wiping rod is pressed down through the air cylinder, after polishing and grinding are finished, the ash wiping rod rotates to a position horizontal to the running direction of the strip steel through the rotating air cylinder, and the ash wiping rod is lifted. The height of the ash wiping rod lifted by the up-and-down moving cylinder is 10-50mm away from the strip steel, and the swinging angle of the ash wiping rod is 90 degrees.
The identification of roll mark defects on the steel strip surface after polishing is realized by combining machine vision with a manual identification method, the image acquisition on the polished surface is shown in figure 7, the image acquisition is completed by a group of line group cameras, the adoption frequency of the line group cameras is 1000-30000HZ, the acquired images are transmitted to an operating room of a unit through optical fibers, field quality inspection personnel can observe images continuously moving on the steel strip surface in real time, a computer stores the acquired images into photos, meanwhile, the AI analysis technology is adopted to prompt the photos with defects on the surface, and after polishing and polishing are finished, quality inspection personnel confirm the photos.
An online detection method for roll mark defects on the surface of a cold-rolled sheet comprises the following steps:
step 1: the detection system receives unit information;
when the unit needs to be polished, the upper computer of the detection system reduces the running speed of the strip steel of the unit to 10-30m/min, and then sends the current information of the strip steel, the running speed of the unit and a polishing starting signal to the polisher;
and 2, step: calculating polishing and grinding parameters;
after the detection system receives a detection signal sent by the upper computer, the system PLC indicates two grinding arms of the polishing and grinding machine to move towards the middle of the strip steel, the actual width of the strip steel is detected, the position (X) and the swing speed n1 of the two grinding swing arms are calculated according to the actual width of the current strip steel and the actual running speed of the strip steel, and a completion signal is sent to the PLC after the calculation is completed and the grinding arms reach the designated positions;
and step 3: starting a polishing ash erasing mechanism;
after the detection system receives a detection signal sent by an upper computer, the PLC of the system indicates a rotary cylinder in the ash polishing and erasing mechanism to swing an ash wiping arm by 90 degrees to be perpendicular to the moving direction of the strip steel, an up-and-down moving cylinder on the ash wiping arm presses down the ash wiping arm, so that an ash wiping cloth on the ash wiping arm is in soft contact with the strip steel, and a completion signal is sent to the PLC after the PLC is successfully started;
and 4, step 4: starting an image acquisition system;
after the detection system receives a detection signal sent by an upper computer, the system PLC instructs the image acquisition system to move the linear light source downwards to a rated position away from the strip steel, starts each camera in the image acquisition system, starts the image processing system, and sends a completion signal to the PLC after the start is successful;
and 5: the detection system starts working;
after the system PLC receives the completion signal of the step 2-4, the system PLC indicates the detection system to start working, the polishing polisher starts polishing operation, the image acquisition system continuously acquires the surface images of the strip steel, the image analysis system gives out the images of the defects and the types of the defects (such as roll marks, zinc slag, vibration lines, scratches and the like), and the detection result is displayed on the picture of the computer;
step 6: manually further discriminating defect types;
when the detection system PLC receives the polishing completion sent by the upper computer, the moving speed of the strip steel is reduced to 0, the polishing machine, the ash wiping machine and the image acquisition system stop working, the acquired image is rechecked manually, the accuracy of the defect type judged by the image identification system is judged, suspected defects in the image are further screened, and if necessary, the real condition of the surface of the strip steel is actually observed on a unit;
and 7: detection end and detection result output;
after the detection is manually confirmed to be finished, the computer automatically generates a detection report, the polishing arm is lifted to the initial state, the dust wiping arm is lifted after the dust wiping mechanism rotates for 90 degrees, the camera light source is lifted, meanwhile, a detection finished signal is sent to the unit, and the detection task is finished
Compared with the prior art, the invention has the following advantages:
the detection system can realize the surface of the strip steel to be 0.5mm 2 The full-automatic detection system realizes the inspection of the surface of the strip steel under the condition of the crawling speed of the strip steel, has the characteristics of high detection speed and high detection precision, and can detect the defects of roll marks and the like in large and small sizesThe heavy polishing work and the troublesome setting work are liberated, and the productivity of the unit is greatly improved.
Drawings
FIG. 1 is a schematic view of a polishing and grinding machine;
FIG. 2 is a schematic view of the entire inspection system;
FIG. 3 is a schematic view of a structure of a polished oilstone;
FIG. 4 is a schematic view of an image acquisition system;
FIG. 5 is a schematic view of an image acquisition process;
FIG. 6 is a schematic diagram of an ash wiping process;
FIGS. 7 and 8 show the traces of polishing;
FIG. 9 is a schematic diagram of the detection process.
In the figure: the device comprises a gantry frame 1, a movable servo motor 2, a movable guide rail 3, a swinging servo motor 4, a worm gear speed reducer 5, a transmission shaft 6, a swinging arm 7, a distance measuring sensor 8, a cylinder 9, a flexible polishing head 10, a polishing oilstone 11, a strip steel 12, a strip steel 22, an image acquisition system 23, an ash wiping system 24, a polishing polisher 25, an inspection table 31, soft steel 32, a support frame 33, a polyurethane flexible body 34, an abrasive material 41, a control box 42, a support II 43, a line group camera 44, a line light source 45 and a lifting mechanism.
Detailed Description
For the purpose of promoting an understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Example 1: referring to fig. 1, the on-line detection system for the roll mark defects on the surface of the cold-rolled sheet comprises a strip steel surface polishing and grinding system, a strip steel surface ash wiping system and a strip steel surface image detection system, wherein the detection system is installed on a production line of a unit, and the detection of the roll mark defects on the surface of the strip steel is realized under the condition of the strip steel crawling speed.
The strip steel surface polishing and grinding system comprises a gantry frame 1, a movable guide rail 3, a worm gear speed reducer 5, a servo motor, a transmission shaft 6, a swing arm 7, a cylinder 9, a flexible grinding head 10, a permanent magnet and grinding oilstones 11, wherein the whole grinding machine is installed on the fixed gantry frame, the movable guide rail 3 is arranged on the gantry frame 1, the grinding machine is driven by the servo motor, the servo motor passes through the worm gear speed reducer, a swing arm (with the length of 500 mm) is installed on an output shaft of the worm gear speed reducer, the head of the swing arm is connected with the cylinder, the flexible grinding head is connected below the cylinder and is connected with the grinding oilstones through the permanent magnet, the length L =150mm of the grinding oilstones, the initial positions of two groups of grinding swing arms are horizontal positions and contract to the insides of supports on two sides by 180 degrees, and the strip steel can not touch the grinding head when the groups operate at normal speed and under the condition of strip steel shaking.
In order to ensure that the polishing oilstone can keep flexible and close contact with the strip steel, a plurality of groups of springs are arranged in the flexible polishing head, and the flexible polishing head is combined with a cylinder connected with the springs, so that the polishing head can have omnibearing flexibility, and the polishing head can be ensured to be adaptive to the shape of the strip steel surface. In order to achieve the required grinding effect, the contact force between the grinding head and the strip steel is usually 1-3kg, the grinding force is adjusted by adjusting the working pressure of an air cylinder under the condition of certain grinding head structure, and the working pressure of the air cylinder is 0.5-2kg/cm 2 ；
The grinding whetstone is a member contacting the strip steel, and has a structure as shown in fig. 4, and includes a soft steel sheet, a holder, a polyurethane elastomer (30-50 mm thick), and an abrasive (disk-shaped or strip-shaped whetstone). In order to ensure the suction force of the flexible polishing head and the polished oilstone, the thickness of the soft steel sheet is 1-2mm, in order to ensure that the polished oilstone has certain elasticity, the thickness of the polyurethane material is 30-50mm, the hardness of the polyurethane material is 30-60A, the grinding material adopts a disc-shaped or strip-shaped grinding material, the thickness of the disc-shaped or strip-shaped grinding material is 5-10mm, the material is corundum or silicon carbide, and the fineness of the grinding material is 500-800 meshes.
In the polishing process, the polisher is stationary, and the strip moves forward at a certain speed (n 2, unit: mm/min), and the polishing traces on the surface of the strip during the polishing process are shown in FIG. 5. To realize polishing of the whole board, a A angle of the arm of polishing back and forth swing, the swing speed (n 1, unit) of the swing arm is not less than:
n1≤2×A×A×n2×cos(A/2)/L
the width range that the swing arm can cover belted steel once making a round trip to swing among the polishing process does: r × sin (A/2).
The image acquisition system comprises a support, 4 line group cameras, a line light source with the length of 1800mm and a set of lifting mechanism, wherein the 4 line group cameras are arranged on the support, and the lifting mechanism is arranged on one side of the support. As the distance between the light source and the strip steel is required to be 300 +/-10 mm during image detection, and the light source is required to be at least 500mm away from the strip steel in non-detection time, a set of lifting mechanism is additionally arranged for the system, so that the position between the light source and the strip steel is variable.
Example 1:
referring to fig. 1-9, in a finishing unit for producing an automobile sheet, the thickness of the produced automobile sheet with galvanized surface is 0.5-2.0mm, the width of the automobile sheet is 1200-1800mm, the normal running speed of the unit is 200m/min, the running speed during detection is 10m/min, and the roll mark defect on the surface of the galvanized automobile sheet needs to be detected, and the roll mark detection on the unit is implemented specifically as follows:
1) The roll mark detection system is arranged above the machine set inspection station, the detection system protects the polishing and grinding system, the grinding ash erasing system is equipped with the grinding image automatic acquisition system, and the whole system is controlled by a PLC and is communicated with the machine set. When the surface of the galvanized automobile plate needs to be polished, the unit sends a polishing instruction to the detection system PLC, after the detection system finishes all detection works, the detection system returns to an initial state, and meanwhile, a detection result is returned to the unit, so that the current detection is finished.
2) According to the actual width of belted steel on the unit, polish for satisfying the full plate, adopt two groups polishing mechanism, it constitutes as shown in fig. 8, the polisher is installed on fixed portal frame, the polisher is driven by servo motor, servo motor passes through worm gear and reduces speed, install swing arm (length 500 mm) on worm gear and reduction gear's the output shaft, the head of swing arm is connected with the cylinder, the cylinder below is connected with flexible head of polishing, flexible head of polishing links to each other with the whetstone of polishing through permanent magnet, the length L =150mm of whetstone. The two groups of grinding swing arms are at horizontal positions at the initial positions and are contracted into the two-side bracket at an angle of 180 degrees, so that the strip steel can not touch the grinding head when the unit runs at normal speed and under the condition of strip steel shaking.
3) After the detection system receives a polishing instruction issued by the unit, the detection system receives information (width, thickness, type of belt feel, length check and the like) sent by the unit to the strip steel, the polisher moves from two sides to the middle under the driving of the movable servo motor, the distance measuring sensor below the servo motor finds the edge position of the strip steel, the system can calculate the real width W of the strip steel, and the swing angle A (degree) of the swing arm, the distance X between the two swing arms and the swing speed (n 1, degree/min) of the swing arm can be calculated according to the real width, as shown in fig. 8:
A＝0.83×180×arccos(W/1000)/π(°)
X＝0.83×W/2(mm)
n1≤2×A×A×n2×cos(A/2)/L(°/min)
4) After the detection system calculates and obtains the polishing parameters, the polishing arm swings to a designated position, the air cylinder on the polishing arm is pressed down, and the polisher starts to work. The pressure of the cylinder is adjusted according to the type and thickness of the strip steel, and the variation range of the pressure of the compressed air for the cylinder is 0.5-2kg/cm 2 。
5) After the polishing and grinding machine is started, the detection system starts the grinding ash erasing system, the ash wiping rod swings to a position vertical to the strip steel under the action of the rotary air cylinder, and the ash wiping rod is pressed down through the air cylinder to start ash wiping operation.
6) The image acquisition system consists of a bracket, 4 line group cameras, a line light source with the length of 1800mm and a set of lifting mechanism. Because the distance between the light source and the strip steel is required to be 300 +/-10 mm during image detection, and the light source is required to be at least 500mm away from the strip steel within the non-detection time, a set of lifting mechanism is additionally arranged for the system, so that the position between the light source and the strip steel is variable.
7) After the polishing and grinding machine is started, the detection system starts the image acquisition system, when the polishing and grinding machine starts to work, the system PLC sends out an instruction to move a linear light source to a specified position, the image acquisition system starts to work, the acquired image is transmitted to an operation room of a unit through an optical fiber, on-site quality inspectors can observe images of continuous movement of the surface of the strip steel in real time, the computer stores the acquired images as photos, meanwhile, an AI analysis technology is adopted to prompt the photos with defects on the surface, and after the polishing and grinding are finished, the quality inspectors confirm the photos.
The original appearance of the defects on the surface of the galvanized automobile plate, which are detected by adopting the operation method, can not find the roll mark defects on the surface of the plate, and the defects on the surface of the plate, such as the dark concave points and the bright convex points, can be obviously detected by the detection method. This detection effect benefits from at first adopting the polishing method of this patent of polishing, and the trace of polishing that adopts the machine to polish obtained is obviously superior to artifical polishing, and the trace of polishing that the machine was polished obtained is more even, and detection effect obtains obvious promotion. The detection method only needs about 25 seconds for completing the detection of the length of 6 meters, the manual polishing detection method at least needs 5 minutes, and the detection efficiency is greatly improved
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (7)
1. The utility model provides an online real-time detection system of cold rolled sheet surface roll mark class defect, its characterized in that, detecting system includes belted steel surface polishing system of polishing, and belted steel surface ash of polishing is erased system and belted steel surface image acquisition and is established other system, and whole detecting system is controlled by PLC, realizes the communication with the unit, and detecting system installs on the production line of unit, under the condition of belted steel crawl speed, realizes the detection of belted steel surface roll mark class defect.
2. The system for online real-time detection of roll marks on the surface of a cold-rolled sheet according to claim 1, wherein the system for polishing and grinding the surface of the strip steel comprises a gantry frame, a movable guide rail, a worm gear reducer, a servo motor, a transmission shaft, two groups of swing arms, a cylinder, a flexible grinding head, a permanent magnet and a grinding oilstone, the whole grinding machine is mounted on the fixed gantry frame, the movable guide rail is arranged on the gantry frame, the grinding machine is driven by the servo motor, the worm gear reducer is driven by the servo motor, the swing arms are mounted on an output shaft of the worm gear reducer, the cylinder is connected to the heads of the swing arms, the flexible grinding head is connected to the lower part of the cylinder, the flexible grinding head is connected with the grinding oilstone through the permanent magnet, the length L of the grinding oilstone is 100-200mm, the two groups of grinding swing arms are horizontal at initial positions and contract into the gantry frame at 180 degrees to two sides, and the strip steel cannot touch the grinding head when the machine operates at normal speed and under the condition of strip steel shaking.
3. The system for on-line real-time detection of roll mark defects on the surface of a cold-rolled sheet according to claim 2, wherein a plurality of groups of springs are arranged in the flexible polishing head, the polishing head has omnibearing flexibility through a cylinder connected with the springs, the polishing head is ensured to be adaptive to the shape of the strip steel surface, the pressure of the cylinder of the polishing head is adjusted according to the steel type, and the working pressure of the cylinder is 0.5-2kg/cm 2 ；
The polished oilstone comprises a soft steel sheet, a support frame, a polyurethane elastomer (30-50 mm thick) and an abrasive (disk-shaped or strip-shaped oilstone strips) from top to bottom, wherein the thickness of the soft steel sheet is 1-2mm, the thickness of the polyurethane material is 30-50mm, the hardness of the polyurethane material is 30-60A, the abrasive adopts the disk-shaped or strip-shaped abrasive, the thickness of the abrasive is 5-10mm, the material is corundum or silicon carbide, and the fineness of the abrasive is 500-800 meshes.
4. The on-line real-time detection system for roll mark defects on the surface of a cold-rolled sheet according to claim 2,
in the polishing and grinding process, the grinding arm swings back and forth by an angle A, and the swing speed (n 1, unit: (degree/min)) of the swing arm is not less than:
n1≧A×n2/2L
the width range that the swing arm can cover belted steel once making a round trip to swing among the polishing process does: r × sin (A/2).
5. The on-line detection system for the roll mark defects on the surface of the cold-rolled sheet according to claim 2, wherein the image acquisition system comprises a detection support, 4 line scanning cameras, a line light source capable of covering the maximum product width of a unit and a set of light source lifting mechanism, the 4 line scanning cameras are controlled by a synchronous data acquisition unit to realize synchronous acquisition of images of the strip steel surface defects, and the acquired images are screened in a mode of combining artificial intelligence with manual identification.
6. The on-line real-time detection system for roll marks on the surface of a cold-rolled sheet according to claim 2, wherein a polishing ash wiping system is arranged on the surface of the polished strip steel.
7. An on-line detection method for roll mark defects on the surface of a cold-rolled sheet is characterized by being realized by adopting the detection system of any one of claims 1 to 6, and the detection method comprises the following steps:
step 1: the detection system receives unit information;
when the unit needs to be polished, the upper computer of the detection system reduces the running speed of the strip steel of the unit to 10-30m/min, and then sends the current information of the strip steel, the running speed of the unit and a polishing starting signal to the polisher;
step 2: calculating polishing and grinding parameters;
after the detection system receives a detection signal sent by the upper computer, the system PLC instructs the two grinding arms of the polishing and grinding machine to move towards the middle of the strip steel, detects the actual width of the strip steel, calculates the position (X) and the swing speed n1 of the two grinding swing arms according to the current actual width and the actual running speed of the strip steel, and sends a completion signal to the PLC after the calculation is completed and the grinding arms reach the designated positions;
and step 3: starting a polishing ash erasing mechanism;
after the detection system receives a detection signal sent by an upper computer, the PLC of the system instructs a rotary cylinder in the ash polishing and erasing mechanism to swing an ash wiping arm by 90 degrees in the direction perpendicular to the moving direction of the strip steel, an up-and-down moving cylinder on the ash wiping arm presses down the ash wiping arm, so that ash wiping cloth on the ash wiping arm is in soft contact with the strip steel, and a completion signal is sent to the PLC after the ash wiping cloth is successfully started;
and 4, step 4: starting an image acquisition system;
after the detection system receives a detection signal sent by the upper computer, the system PLC instructs the image acquisition system to move the linear light source downwards to a rated position away from the strip steel, starts each camera in the image acquisition system, starts the image processing system, and sends a completion signal to the PLC after the start is successful;
and 5: the detection system starts working;
after the system PLC receives the completion signal of the step 2-4, the system PLC indicates the detection system to start working, the polishing and grinding machine starts grinding operation, the image acquisition system continuously acquires the surface images of the strip steel, the image analysis system gives the images of the defects and the types of the defects, and the detection result is displayed on the picture of the computer;
and 6: manually discriminating defect types;
when the detection system PLC receives the polishing completion sent by the upper computer, the moving speed of the strip steel is reduced to 0m/min, the polishing machine, the ash wiping machine and the image acquisition system stop working, the acquired images are rechecked manually, and the real condition of the surface of the strip steel is actually observed on a unit if necessary;
and 7: detection end and detection result output;
after the detection is manually confirmed to be finished, the computer automatically generates a detection report, the polishing arm is lifted to return to the initial state, the dust wiping arm is lifted after the dust wiping mechanism rotates for 90 degrees, the camera light source is lifted, and meanwhile, a detection finished signal is sent to the unit to finish the detection task.
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| CN202211289667.9A CN115494075A (en) | 2022-10-20 | 2022-10-20 | Online detection system and method for roll mark defects on surface of cold-rolled sheet |
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| CN202211289667.9A CN115494075A (en) | 2022-10-20 | 2022-10-20 | Online detection system and method for roll mark defects on surface of cold-rolled sheet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117548494A (en) * | 2024-01-02 | 2024-02-13 | 沧州中铁装备制造材料有限公司 | Automatic number reporting intelligent management system for steel rolling processing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117548494A (en) * | 2024-01-02 | 2024-02-13 | 沧州中铁装备制造材料有限公司 | Automatic number reporting intelligent management system for steel rolling processing |
| CN117548494B (en) * | 2024-01-02 | 2024-03-29 | 沧州中铁装备制造材料有限公司 | Automatic number reporting intelligent management system for steel rolling processing |
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