CN111141820A - Crack roller judging method - Google Patents
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- CN111141820A CN111141820A CN201911363631.9A CN201911363631A CN111141820A CN 111141820 A CN111141820 A CN 111141820A CN 201911363631 A CN201911363631 A CN 201911363631A CN 111141820 A CN111141820 A CN 111141820A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 147
- 239000000523 sample Substances 0.000 claims description 55
- 239000013078 crystal Substances 0.000 claims description 25
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 230000004323 axial length Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 12
- 239000010959 steel Substances 0.000 abstract description 12
- 238000005096 rolling process Methods 0.000 abstract description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves
Abstract
The invention discloses a method for judging a crack roller, which belongs to the technical field of steel rolling and comprises the following steps: step A, judging whether the accident roller has cracks or not; b, detecting and recording the crack position of the roller; step C, detecting the maximum depth of the cracks of the cracked roller; d, detecting whether the crack roller bonding layer is damaged or not; e, detecting whether the working layer of the crack roller is normal or not; and F, tracking and comparing the crack roller. According to the specific use condition of the rollers made of different materials, the corresponding detection and judgment method is adopted, so that excessive grinding and abnormal loss of the rollers caused by the fact that the rollers are only put on the mill after the cracks are ground are avoided, the workload of a grinding machine and a lathe is reduced, and the waiting of the rollers of the rolling mill caused by low roller preparation efficiency is avoided.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for judging a crack roller.
Background
At present, after a rolling accident occurs in a hot continuous rolling line, accident cracks on the surface of an accident roller are generally removed and then the hot continuous rolling line is used on a machine, so that the safety of the operation of the rolling line and the use of the roller is ensured. On one hand, the accident crack rollers are completely ground, a large number of grinding machines and lathes are needed to grind the accident crack rollers on the machine, so that the workload of the grinding machines and lathes is increased, meanwhile, the standby rollers are tensed when a large number of accident rollers wait for grinding, even the rolling lines wait for the roller to stop, on the other hand, the accident rollers are ground only when the accident rollers are completely ground, so that a large number of abnormal losses of the rollers are caused, the roller consumption is obviously increased, the service life of the rollers is shortened, and the production cost is improved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for judging a crack roller, which adopts a corresponding detection and judgment method according to the specific use condition of the rollers made of different materials, avoids excessive grinding and abnormal loss of the roller caused by that the crack roller can be installed on the machine only by grinding the crack, simultaneously reduces the workload of a grinding machine and a lathe, and avoids the waiting of the roller of the rolling mill caused by low roller preparation efficiency.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for judging a cracked roller comprises the following steps:
step A, judging whether the accident roller has cracks or not, replacing the accident roller, grinding according to the normal grinding quantity, and then carrying out ultrasonic surface wave detection by adopting a 1MHz-2MHz detection frequency and a detection probe matched with the detection frequency or detecting whether the cracks exist or not by adopting eddy current flaw detection; if the ultrasonic surface wave detects no crack or the eddy current flaw detection result does not exceed the eddy current set threshold, the roller is used as a normal roller, if the ultrasonic surface wave detects a crack or the eddy current flaw detection result exceeds the eddy current set threshold, the roller is judged as a crack roller, and the eddy current flaw detection result is recorded and filed;
b, detecting and recording the crack position of the roller, detecting the crack roller by adopting 1MHz-2MHz detection frequency and a detection probe matched with the detection frequency and carrying out ultrasonic surface wave detection on the crack roller, and determining and recording the crack position, length, width and shape according to the graduation on the circumference of the operation side and the axial length from the end face of the operation side;
step C, detecting the maximum depth of the cracks of the crack roller, detecting the depth of the cracks by adopting a 2.5MHz detection frequency and an inclined probe matched with the detection frequency, and recording the maximum depth value of the cracks;
d, detecting whether the crack roller bonding layer is damaged, detecting cracks of the crack roller and the conditions of the crack roller and the surrounding bonding layer by adopting a 2MHz detection frequency and an ultrasonic single crystal straight probe matched with the detection frequency, judging that the crack roller with the detection result consistent with a normal area is a normal crack roller of the bonding layer, and discarding the crack roller with full-screen reflection or multiple reflection of the detection result;
e, detecting whether the working layer of the crack roller is normal, detecting the cracks of the normal crack roller of the bonding layer and the conditions in the surrounding working layer by adopting 2MHz detection frequency and an ultrasonic bicrystal probe matched with the detection frequency, continuously and normally using the roller without a protruding reflected wave between the initial wave and the bottom wave of the bicrystal detection waveform, and grinding the roller with the protruding reflected wave between the initial wave and the bottom wave of the bicrystal detection waveform according to the maximum depth value of the crack recorded in the step C until the bicrystal detection does not have the protruding reflected wave and then using the roller;
and F, tracking and comparing the crack roller, putting the roller on a machine with the crack into use, tracking and comparing the detection result of the inclined probe and the ultrasonic twin-crystal probe after each time of off-machine, or tracking the eddy current flaw detection result at the same time, wherein the maximum depth value of the flaw detection crack of the inclined probe is gradually reduced, the shape and the size of the crack are basically unchanged, or the value of the eddy current flaw detection crack is unchanged or reduced, no protruding reflected wave exists in the twin-crystal flaw detection crack and the surrounding working layer, putting the roller into use, the maximum depth value of the flaw detection crack of the inclined probe is increased, or the shape and the size of the crack are increased, or the value of the eddy current flaw detection crack is increased at the same time, a reflected wave exists between the initial wave and the bottom wave of the twin-crystal detection waveform, and grinding the roller to be put.
The technical scheme of the invention is further improved as follows: and F, tracking the crack roller for use until the crack is completely eliminated, and using the roller as a normal roller.
The technical scheme of the invention is further improved as follows: the roller comprises the following chemical components in percentage by weight: c: 2.00-3.00%, Si: 0.30-1.00%, Mn: 0.60-1.50%, Cr: 13.00-20.00%, Ni: 0.80-2.20%, Mo: 0.40-2.20%, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further improved as follows: and B, setting the threshold value of the eddy current in the step A to be that the crack value is less than or equal to 0.2mm and the soft point value is less than or equal to 0.6 mm.
The technical scheme of the invention is further improved as follows: and the normal grinding amount in the step A is 0.25mm-0.35 mm.
Due to the adoption of the technical scheme, the invention has the technical progress that:
according to the specific use condition of the rollers made of different materials, the corresponding detection and judgment method is adopted, so that excessive grinding and abnormal loss of the rollers caused by the fact that the rollers are only put on the mill after the cracks are ground are avoided, the workload of a grinding machine and a lathe is reduced, and the waiting of the rollers of the rolling mill caused by low roller preparation efficiency is avoided.
The method for detecting and judging the flaw of the accident crack roller not only improves the efficiency of a grinding machine and reduces the consumption of the roller, improves the utilization rate and the service life of the accident crack roller, but also pointedly tracks the later use condition of the accident crack roller according to the change conditions of detection results such as vortex, an inclined probe, bicrystal and the like, avoids the peeling and the accident loss such as steel piling, steel clamping and the like caused by further crack expansion of the accident crack roller in the use process, and ensures the safe operation and the stability of the roller.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
example 1
A method for judging a cracked roller comprises the following steps:
step A, judging whether the accident roller has cracks, changing the accident roller, grinding the accident roller by 0.31mm according to the normal grinding amount, and then carrying out ultrasonic surface wave detection by adopting a 1MHz detection frequency and a detection probe matched with the detection frequency to detect the cracks, wherein the accident roller is judged to be a crack roller, the accident roller in the embodiment is a steel clamping accident roller with the diameter of 680.42mm, the residual effective working layer is 10.42mm, and the chemical components and the weight percentage of the components are as follows: c: 2.05%, Si: 0.47%, Mn: 1.33%, Cr: 18.75%, Ni: 2.10%, Mo: 1.66 percent, and the balance of Fe and inevitable impurities;
b, detecting and recording the crack position of the roller, detecting the crack roller by adopting 1MHz detection frequency and a detection probe matched with the detection frequency, detecting the crack roller by adopting ultrasonic surface waves, taking the upward pointing direction of a vertical bisector of the lettering of the operation side lettering head as a point 0, and recording the position, the length, the width and the shape of the crack belt, wherein a steel clamping net-shaped thermal crack belt exists on a roller surface which is arranged on a circumferential clockwise 93-degree axial generatrix and is 926mm away from the operation side and 452mm-1378mm in length, and the circumferential width of the crack belt is 24 mm;
step C, detecting the maximum depth of the cracks of the cracked roller, detecting the depth of the cracks by adopting a 2.5MHz detection frequency and an inclined probe matched with the detection frequency, and recording the maximum depth value of the cracks as H =9.5 mm;
d, detecting whether the bonding layer of the crack roller is damaged, detecting the crack of the crack roller and the conditions of the crack roller and the surrounding bonding layer by adopting a 2MHz detection frequency and an ultrasonic single crystal straight probe matched with the 2MHz detection frequency, wherein the depth of the crack and the surrounding bonding layer is 28mm and the wave height is 17% f.s, the depth of the bonding layer in a normal area is 26-31mm and the wave height is 14-21% f.s, and judging that the bonding layer is a normal crack roller by comparing the detection result with the normal area;
step E, detecting whether the working layer of the crack roller is normal, detecting the cracks of the normal crack roller of the bonding layer and the conditions in the surrounding working layer by adopting 2MHz detection frequency and an ultrasonic double-crystal probe matched with the detection frequency, wherein no protruding reflected wave exists between the initial wave and the bottom wave of the double-crystal detection waveform, and judging that the accident roller is qualified and continuously putting into use and recording;
step F, tracking and comparing the crack roller, wherein after the roller with the crack machine put into use in the embodiment is subjected to offline every time, grinding about 0.3mm according to a normal roller, tracking and comparing detection results of an oblique probe and an ultrasonic double-crystal probe, the maximum depth value of a crack detected by the oblique probe is gradually reduced, when the roller is used to be scrapped normally, the diameter 670mm of the steel clamping accident roller is 4.3mm, no protruding reflected wave exists in a double-crystal detection working layer during the period, the axial length of a crack belt is shortened from 926mm to 484mm, and the width of the crack belt in the circumferential direction is narrowed to 11 mm.
Example 2
Step A, judging whether the accident roller has cracks, replacing the accident roller, grinding the accident roller by 0.29mm according to the normal grinding amount, then detecting the cracks by adopting 1MHz detection frequency and a detection probe matched with the detection frequency, and judging the accident roller as the crack roller, wherein the accident roller in the embodiment is a steel clamping accident roller with the diameter of 705.63mm, the residual effective working layer is 35.63mm, and the chemical components and the weight percentage of the components are as follows: c: 2.61%, Si: 0.85%, Mn: 0.92%, Cr: 14.82%, Ni: 0.95%, Mo: 0.58% of Fe and the balance of inevitable impurities;
b, detecting and recording the crack position of the roller, detecting the crack roller by adopting 1MHz-2MHz detection frequency and a detection probe matched with the detection frequency, detecting the crack roller by adopting ultrasonic surface waves, taking the upward pointing direction of a vertical bisector of the lettering head at the operation side as a point 0, and recording the position, the length, the width and the shape of the crack belt, wherein a steel clamping net-shaped thermal crack belt exists on a roller surface which is located on an axial generatrix of 174 degrees clockwise of the circumference and is 336mm-1509mm long and 1173mm away from the operation side, the circumferential width of the crack belt is 17 mm;
step C, detecting the maximum depth of the cracks of the cracked roller, detecting the depth of the cracks by adopting a 2.5MHz detection frequency and an inclined probe matched with the detection frequency, and recording the maximum depth value of the cracks as H =6.9 mm;
d, detecting whether the bonding layer of the crack roller is damaged, detecting the crack of the crack roller and the conditions of the crack roller and the surrounding bonding layer by adopting a 2MHz detection frequency and an ultrasonic single crystal straight probe matched with the 2MHz detection frequency, detecting the crack and the surrounding bonding layer with the depth of 45mm and the wave height of 13% f.s, and judging the bonding layer with the normal crack roller by comparing the detection result with the normal region, wherein the bonding layer with the normal region has the depth of 40-47mm and the wave height of 10-20% f.s;
step E, detecting whether the working layer of the crack roller is normal, detecting the cracks of the normal crack roller of the bonding layer and the conditions in the surrounding working layer by adopting 2MHz detection frequency and an ultrasonic double-crystal probe matched with the detection frequency, wherein no protruding reflected wave exists between the initial wave and the bottom wave of the double-crystal detection waveform, and judging that the accident roller is qualified and continuously putting into use and recording;
and F, tracking and comparing the crack roller, namely, after the roller with the crack upper machine put into use is subjected to off-line every time and is ground about 0.3mm according to a normal roller, tracking and comparing detection results of an oblique probe and an ultrasonic double-crystal probe, gradually reducing the maximum depth value of a crack detected by the oblique probe, completely eliminating the crack detected by the steel clamping accident roller when the roller is used to the diameter of 690.83mm when the roller is normally scrapped, and detecting that no protruding reflected wave exists in a detection working layer by the ultrasonic double-crystal probe during the period.
Example 3
Step A, judging whether the accident roller has cracks, changing the accident roller, grinding by 0.26mm according to the normal grinding amount, and detecting whether the cracks exist by adopting eddy current inspection, wherein the accident roller in the embodiment is a tail-flick accident roller with the diameter of 771.59mm, the residual effective working layer is 11.59mm, and the chemical components and the weight percentage of each component are as follows: c: 2.25%, Si: 0.42%, Mn: 1.08%, Cr: 19.52%, Ni: 1.64%, Mo: 1.97 percent, the balance of Fe and inevitable impurities, setting a threshold value of the eddy current to be that a crack value is less than or equal to 0.2mm, a soft point value is less than or equal to 0.6mm, judging the fault roller as a crack roller according to the eddy current flaw detection result that an overproof reading exists at a position which is about 560mm away from the operation side, the crack value is 2.5mm, and the soft point value is 3.0mm, and recording and archiving the eddy current flaw detection result;
b, detecting and recording the crack position of the roller, detecting the crack roller by adopting 1MHz detection frequency and a detection probe matched with the detection frequency, detecting the crack roller by adopting ultrasonic surface waves, and recording the position, the length, the width and the shape of a crack belt by using an X-shaped drift crack on a circumferential clockwise 55-degree axial generatrix and a roller surface which is away from an operation side 563mm, wherein the upward pointing direction of a vertical bisector of the lettering of an operation side lettering head is a 0 point;
step C, detecting the maximum depth of the cracks of the cracked roller, detecting the depth of the cracks by adopting a 2.5MHz detection frequency and an inclined probe matched with the detection frequency, and recording the maximum depth value of the cracks as H =4.7 mm;
and D, detecting whether the bonding layer of the crack roller is damaged, detecting the crack of the crack roller and the conditions of the crack and the surrounding bonding layer by adopting a 2MHz detection frequency and an ultrasonic single crystal straight probe matched with the 2MHz detection frequency, detecting the crack and the bonding layer depth of the crack roller within the range of about 200mm of the radius of the crack and the surrounding, wherein the wave height exceeds 100% f.s and multiple reflection defect waves exist, the crack roller is scrapped without continuously detecting whether the working layer of the crack roller is normal or not, and the scrapped crack roller is not installed on a machine or is not subjected to tracking comparison of the crack.
Example 4
Step A, judging whether the accident roller has cracks, changing the accident roller, grinding the accident roller by 0.32mm according to the normal grinding amount, and detecting whether the cracks exist by adopting eddy current inspection, wherein the accident roller in the embodiment is a tail-flick accident roller with the diameter of 784.61mm, the residual effective working layer is 24.61mm, and the chemical components and the weight percentage of each component are as follows: c: 2.87%, Si: 0.82%, Mn: 1.25%, Cr: 13.41%, Ni: 1.25%, Mo: 0.63 percent of Fe and inevitable impurities, setting the threshold value of the eddy current as the crack value is less than or equal to 0.2mm, the soft point value is less than or equal to 0.6mm, judging the fault roller as a crack roller according to the eddy current flaw detection result that the overproof reading exists at the position 490mm away from the operation side, the crack value is 3.0mm and the soft point value is 3.0mm, and recording and archiving the eddy current flaw detection result;
b, detecting and recording the crack position of the roller, detecting the crack roller by adopting 1MHz detection frequency and a detection probe matched with the detection frequency, detecting the crack roller by adopting ultrasonic surface waves, and recording the position, the length, the width and the shape of a crack zone, wherein an X-shaped drift crack exists on a circumferential clockwise 214-degree axial generatrix with the upward pointing direction of a vertical bisector of the lettering head at an operation side as a 0 point and on a roller surface with the distance of 490mm from the operation side, the length of the crack is 95 mm;
step C, detecting the maximum depth of the cracks of the cracked roller, detecting the depth of the cracks by adopting a 2.5MHz detection frequency and an inclined probe matched with the detection frequency, and recording the maximum depth value of the cracks as H =9.4 mm;
d, detecting whether the bonding layer of the crack roller is damaged, detecting the crack of the crack roller and the conditions of the crack roller and the surrounding bonding layer by adopting a 2MHz detection frequency and an ultrasonic single crystal straight probe matched with the 2MHz detection frequency, detecting the crack and the surrounding bonding layer with the depth of 32mm and the wave height of 15% f.s, and determining the bonding layer with the depth of 29-36mm and the wave height of 10-22% f.s in a normal area, and comparing the detection result with the normal area to determine that the bonding layer is the normal crack roller;
step E, detecting whether the working layer of the crack roller is normal, detecting the cracks of the normal crack roller of the bonding layer and the conditions in the surrounding working layer by adopting 2MHz detection frequency and an ultrasonic double-crystal probe matched with the detection frequency, wherein no protruding reflected wave exists between the initial wave and the bottom wave of the double-crystal detection waveform, and judging that the accident roller is qualified and continuously putting into use and recording;
step F, tracking and comparing the crack roller, wherein the roller with the crack machine put into use in the embodiment is ground about 0.3mm according to a normal roller after being off-line every time, and then a slant probe, an ultrasonic bicrystal probe detection result and an eddy current flaw detection result are tracked and compared, the maximum depth value of the eddy current flaw detection becomes smaller gradually, the depth of the slant probe detection flaw becomes smaller and the crack becomes thinner gradually, when the roller is used to be scrapped normally, the tail-flicking accident roller is used to be 762.37mm in diameter, the crack value and the soft point value of the eddy current detection result are respectively 0 and 0.2, and no protruding reflected wave exists in the ultrasonic bicrystal probe detection working layer in the period.
Example 5
Step A, judging whether the accident roller has cracks, changing the accident roller, grinding by 0.28mm according to the normal grinding amount, and detecting whether the cracks exist by adopting eddy current inspection, wherein the accident roller in the embodiment is a tail-flick accident roller with the diameter of 797.49mm, the residual effective working layer is 37.49mm, and the chemical components and the weight percentage of each component are as follows: c: 1.63%, Si: 0.56%, Mn: 1.13%, Cr: 16.71%, Ni: 1.06%, Mo: 1.43 percent, the balance of Fe and inevitable impurities, setting a threshold value of the eddy current to be that a crack value is less than or equal to 0.2mm, a soft point value is less than or equal to 0.6mm, judging the fault roller as a crack roller according to the eddy current flaw detection result of the embodiment that an overproof reading exists at a position 1300mm away from an operation side, the crack value is 1.8, and the soft point value is 3.0, and recording and archiving the eddy current flaw detection result;
b, detecting and recording the crack position of the roller, detecting the crack roller by adopting 1MHz-2MHz detection frequency and a detection probe matched with the detection frequency, detecting the crack roller by adopting ultrasonic surface waves, and recording the position, the length, the width and the shape of a crack belt by using an X-shaped drift crack on a circumferential clockwise 270-degree axial generatrix and a roller surface which is 1275mm away from an operation side, wherein the upward pointing direction of a vertical bisector of lettering of an operation side lettering head is a 0 point;
step C, detecting the maximum depth of the cracks of the cracked roller, detecting the depth of the cracks by adopting a 2.5MHz detection frequency and an inclined probe matched with the detection frequency, and recording the maximum depth value of the cracks as H =10.2 mm;
d, detecting whether the bonding layer of the crack roller is damaged, detecting the crack of the crack roller and the conditions of the crack roller and the surrounding bonding layer by adopting a 2MHz detection frequency and an ultrasonic single crystal straight probe matched with the 2MHz detection frequency, detecting the crack and the surrounding bonding layer with the depth of 35mm and the wave height of 18% f.s, and determining the bonding layer with the depth of 32-40mm and the wave height of 9-25% f.s in a normal area, and comparing the detection result with the normal area to determine that the bonding layer is the normal crack roller;
step E, detecting whether the working layer of the crack roller is normal, detecting the cracks of the normal crack roller of the bonding layer and the conditions in the surrounding working layer by adopting 2MHz detection frequency and an ultrasonic double-crystal probe matched with the detection frequency, wherein no protruding reflected wave exists between the initial wave and the bottom wave of the double-crystal detection waveform, and judging that the accident roller is qualified and continuously putting into use and recording;
step F, tracking and comparing the crack roller, wherein the roller with the crack machine put into use in the embodiment is ground about 0.3mm according to a normal roller after being off-line every time, and then a slant probe, an ultrasonic bicrystal probe detection result and an eddy current flaw detection result are tracked and compared, the maximum depth value of the eddy current detection crack is gradually reduced, the depth of the slant probe detection crack is reduced, the crack is gradually reduced, when the roller is used to be scrapped normally, the tail-flicking accident roller diameter is 768.55mm, the crack value and the soft point value of the eddy current detection result are respectively 0 and 0.2, the surface wave detection crack is completely eliminated, and no protruding reflected wave exists in the.
The method for detecting and judging the flaw of the accident crack roller not only improves the efficiency of a grinding machine and reduces the consumption of the roller, improves the utilization rate and the service life of the accident crack roller, but also pointedly tracks the later use condition of the accident crack roller according to the change conditions of detection results such as vortex, an inclined probe, bicrystal and the like, avoids the peeling and the accident loss such as steel piling, steel clamping and the like caused by further crack expansion of the accident crack roller in the use process, and ensures the safe operation and the stability of the roller.
Claims (5)
1. A method for judging a cracked roll, comprising the steps of:
step A, judging whether the accident roller has cracks or not, replacing the accident roller, grinding according to the normal grinding quantity, and then carrying out ultrasonic surface wave detection by adopting a 1MHz-2MHz detection frequency and a detection probe matched with the detection frequency or detecting whether the cracks exist or not by adopting eddy current flaw detection; if the ultrasonic surface wave detects no crack or the eddy current flaw detection result does not exceed the eddy current set threshold, the roller is used as a normal roller, if the ultrasonic surface wave detects a crack or the eddy current flaw detection result exceeds the eddy current set threshold, the roller is judged as a crack roller, and the eddy current flaw detection result is recorded and filed;
b, detecting and recording the crack position of the roller, detecting the crack roller by adopting 1MHz-2MHz detection frequency and a detection probe matched with the detection frequency and carrying out ultrasonic surface wave detection on the crack roller, and determining and recording the crack position, length, width and shape according to the graduation on the circumference of the operation side and the axial length from the end face of the operation side;
step C, detecting the maximum depth of the cracks of the crack roller, detecting the depth of the cracks by adopting a 2.5MHz detection frequency and an inclined probe matched with the detection frequency, and recording the maximum depth value of the cracks;
d, detecting whether the crack roller bonding layer is damaged, detecting cracks of the crack roller and the conditions of the crack roller and the surrounding bonding layer by adopting a 2MHz detection frequency and an ultrasonic single crystal straight probe matched with the detection frequency, judging that the crack roller with the detection result consistent with a normal area is a normal crack roller of the bonding layer, and discarding the crack roller with full-screen reflection or multiple reflection of the detection result;
e, detecting whether the working layer of the crack roller is normal, detecting the cracks of the normal crack roller of the bonding layer and the conditions in the surrounding working layer by adopting 2MHz detection frequency and an ultrasonic bicrystal probe matched with the detection frequency, continuously and normally using the roller without a protruding reflected wave between the initial wave and the bottom wave of the bicrystal detection waveform, and grinding the roller with the protruding reflected wave between the initial wave and the bottom wave of the bicrystal detection waveform according to the maximum depth value of the crack recorded in the step C until the bicrystal detection does not have the protruding reflected wave and then using the roller;
and F, tracking and comparing the crack roller, putting the roller on a machine with the crack into use, tracking and comparing the detection result of the inclined probe and the ultrasonic twin-crystal probe after each time of off-machine, or tracking the eddy current flaw detection result at the same time, wherein the maximum depth value of the flaw detection crack of the inclined probe is gradually reduced, the shape and the size of the crack are basically unchanged, or the value of the eddy current flaw detection crack is unchanged or reduced, no protruding reflected wave exists in the twin-crystal flaw detection crack and the surrounding working layer, putting the roller into use, the maximum depth value of the flaw detection crack of the inclined probe is increased, or the shape and the size of the crack are increased, or the value of the eddy current flaw detection crack is increased at the same time, a reflected wave exists between the initial wave and the bottom wave of the twin-crystal detection waveform, and grinding the roller to be put.
2. The method for determining a cracked roller as claimed in claim 1, wherein: and F, tracking the crack roller for use until the crack is completely eliminated, and using the roller as a normal roller.
3. The method for determining a cracked roller as claimed in claim 1, wherein: the roller comprises the following chemical components in percentage by weight: c: 2.00-3.00%, Si: 0.30-1.00%, Mn: 0.60-1.50%, Cr: 13.00-20.00%, Ni: 0.80-2.20%, Mo: 0.40-2.20%, and the balance of Fe and inevitable impurities.
4. The method for determining a cracked roller as claimed in claim 1, wherein: step A
The set threshold value of the eddy current is that the crack value is less than or equal to 0.2mm, and the soft point value is less than or equal to 0.6 mm.
5. The method for determining a cracked roller as claimed in claim 1, wherein: and the normal grinding amount in the step A is 0.25mm-0.35 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363631.9A CN111141820B (en) | 2019-12-26 | 2019-12-26 | Determination method for crack roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911363631.9A CN111141820B (en) | 2019-12-26 | 2019-12-26 | Determination method for crack roller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113547388A (en) * | 2021-06-30 | 2021-10-26 | 中车太原机车车辆有限公司 | Detection grinding method for coupler knuckle traction table |
| CN116309517A (en) * | 2023-03-31 | 2023-06-23 | 广东汇锦科技有限公司 | Wire rod roller flaw detection method and system for enameled wire |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11183442A (en) * | 1997-12-22 | 1999-07-09 | Sumitomo Metal Ind Ltd | Method and apparatus for flaw detection of crack on rolled roll |
| CN103056391A (en) * | 2011-10-19 | 2013-04-24 | 上海宝钢工业检测公司 | Remanufacturing method of scrap finish rolling high speed steel working roll |
| CN103616435A (en) * | 2013-12-02 | 2014-03-05 | 湖州市银鑫轧辊有限公司 | Roller defect detecting method |
| CN103926311A (en) * | 2013-01-15 | 2014-07-16 | 宝山钢铁股份有限公司 | Ultrasonic detecting method for microscopic cracks of roller surface layer |
| CN104458898A (en) * | 2014-11-28 | 2015-03-25 | 本钢板材股份有限公司 | Treatment method of high-speed steel roller surface cracks |
| CN105319268A (en) * | 2014-07-29 | 2016-02-10 | 上海宝钢工业技术服务有限公司 | Color grade determination method for defect in roller through airborne flaw detector |
| CN109142526A (en) * | 2018-08-24 | 2019-01-04 | 株洲硬质合金集团有限公司 | A kind of detection method of hard alloy roll internal flaw |
| CN110202007A (en) * | 2019-07-05 | 2019-09-06 | 安徽楚江高新电材有限公司 | A method of extending roll working life |
-
2019
- 2019-12-26 CN CN201911363631.9A patent/CN111141820B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11183442A (en) * | 1997-12-22 | 1999-07-09 | Sumitomo Metal Ind Ltd | Method and apparatus for flaw detection of crack on rolled roll |
| CN103056391A (en) * | 2011-10-19 | 2013-04-24 | 上海宝钢工业检测公司 | Remanufacturing method of scrap finish rolling high speed steel working roll |
| CN103926311A (en) * | 2013-01-15 | 2014-07-16 | 宝山钢铁股份有限公司 | Ultrasonic detecting method for microscopic cracks of roller surface layer |
| CN103616435A (en) * | 2013-12-02 | 2014-03-05 | 湖州市银鑫轧辊有限公司 | Roller defect detecting method |
| CN105319268A (en) * | 2014-07-29 | 2016-02-10 | 上海宝钢工业技术服务有限公司 | Color grade determination method for defect in roller through airborne flaw detector |
| CN104458898A (en) * | 2014-11-28 | 2015-03-25 | 本钢板材股份有限公司 | Treatment method of high-speed steel roller surface cracks |
| CN109142526A (en) * | 2018-08-24 | 2019-01-04 | 株洲硬质合金集团有限公司 | A kind of detection method of hard alloy roll internal flaw |
| CN110202007A (en) * | 2019-07-05 | 2019-09-06 | 安徽楚江高新电材有限公司 | A method of extending roll working life |
Non-Patent Citations (7)
| Title |
|---|
| 刘彩华 等: ""济钢ASP粗轧机轧辊失效分析与修复措施"", 《轧钢》, vol. 26, no. 6, pages 35 - 39 * |
| 刘彩华等: "济钢ASP粗轧机轧辊失效分析与修复措施", 《轧钢》 * |
| 刘彩华等: "济钢ASP粗轧机轧辊失效分析与修复措施", 《轧钢》, no. 06, 15 December 2009 (2009-12-15), pages 35 - 39 * |
| 王蕊;马;侯红娟;: "轧辊失效原因分析及预防措施", 太原科技大学学报, no. 1 * |
| 王金秀;王效强;: "热轧宽带ICDP轧辊涡流检测技术的应用", 山东冶金, no. 05 * |
| 赵亮等: "高铬钢粗轧辊带裂纹在CSP轧机上使用探索", 《金属世界》 * |
| 赵亮等: "高铬钢粗轧辊带裂纹在CSP轧机上使用探索", 《金属世界》, no. 01, 15 January 2017 (2017-01-15) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113547388A (en) * | 2021-06-30 | 2021-10-26 | 中车太原机车车辆有限公司 | Detection grinding method for coupler knuckle traction table |
| CN116309517A (en) * | 2023-03-31 | 2023-06-23 | 广东汇锦科技有限公司 | Wire rod roller flaw detection method and system for enameled wire |
| CN116309517B (en) * | 2023-03-31 | 2023-09-01 | 广东汇锦科技有限公司 | Wire rod roller flaw detection method and system for enameled wire |
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