CN113547281A - Method for repairing surface cracks of leveling roller and performing nondestructive testing - Google Patents
Method for repairing surface cracks of leveling roller and performing nondestructive testing Download PDFInfo
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- CN113547281A CN113547281A CN202110759447.7A CN202110759447A CN113547281A CN 113547281 A CN113547281 A CN 113547281A CN 202110759447 A CN202110759447 A CN 202110759447A CN 113547281 A CN113547281 A CN 113547281A
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- leveling roller
- roller
- leveling
- cracks
- repairing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/91—Investigating the presence of flaws or contamination using penetration of dyes, e.g. fluorescent ink
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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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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention relates to the field of leveling roller detection and repair. A method for repairing surface cracks of a leveling roller and carrying out nondestructive testing comprises the following steps of adopting eddy current flaw detection to detect whether cracks exist in the middle of the surface of the leveling roller or not and repairing the cracks in the middle of the surface of the leveling roller by a grooving method; and detecting whether cracks exist on two sides of the surface of the leveling roller or not by adopting dye penetrant inspection, and repairing the cracks on the two sides of the surface of the leveling roller by adopting a large chamfering method. The method can effectively detect and identify the roller surface microcracks and other defects to modify the roller, avoids quality mismatch caused by mounting, efficiently and completely realizes the repairing of the leveling roller and the detection of the roll gap, and reduces the waiting time of the leveling roller.
Description
Technical Field
The invention relates to the field of leveling roller detection and repair.
Background
The flattening process is the final process of the cold-rolled stainless steel strip and plays an important role in the surface quality of the stainless steel.
The prior art is limited to immature detection means and repair methods, defects such as micro cracks on the surface of the leveling roller can not be detected frequently, and the quality of products is unqualified after the leveling roller is arranged on a machine. In the serious case, even if the defects of the roller surface can be seen by naked eyes, the anecdotal repair method and the detection method are not mature, the repair period is long, and the leveling roller is detained on site and even stays for the roller.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to detect the defects such as micro cracks found on the surface of the leveling roller and modify the defects.
The technical scheme adopted by the invention is as follows: a method for repairing surface cracks of a leveling roller and carrying out nondestructive testing comprises the following steps
Detecting whether cracks exist in the middle of the surface of the leveling roller or not by adopting eddy current flaw detection and repairing the cracks in the middle of the surface of the leveling roller by a grooving method;
and detecting whether cracks exist on two sides of the surface of the leveling roller or not by adopting dye penetrant inspection, and repairing the cracks on the two sides of the surface of the leveling roller by adopting a large chamfering method.
The middle part of the surface of the leveling roll refers to an area formed by points with the distance from a point on the effective surface of the leveling roll to the edge of the effective surface being more than or equal to 50mm, and the two sides of the surface of the leveling roll refer to the areas of the effective surface of the leveling roll except the middle part of the surface of the leveling roll.
The step of repairing through a grooving method is that a grinding wheel is used for grooving the inner part of the leveling roller at the position of the roller surface defect of the crack area, then eddy current flaw detection is carried out until the roller surface defect of the crack area does not exist any more, and then the roller surface is integrally ground through the grinding wheel until the roller surface is entirely leveled with the grooving of the roller surface defect area of the crack area.
The large chamfer method repairing means that crack areas on two sides of the surface of the leveling roller are chamfered by using a grinding wheel, then whether cracks exist in the crack areas on the two sides of the surface of the leveling roller or not is detected by adopting dye penetrant inspection, if the number of chamfer degrees is increased, the chamfer angles are continuously opened in the crack areas on the two sides of the surface of the leveling roller until the cracks do not exist in the crack areas on the two sides of the surface of the leveling roller, and then the non-crack areas on the two sides of the surface of the leveling roller are chamfered by using the grinding wheel, wherein the chamfer angles are the same as those in the crack areas on the two sides of the surface of the leveling roller.
The invention has the beneficial effects that: the method can effectively detect and identify the roller surface microcracks and other defects to modify the roller, avoids quality mismatch caused by mounting, efficiently and completely realizes the repairing of the leveling roller and the detection of the roll gap, and reduces the waiting time of the leveling roller.
Drawings
FIG. 1 is a schematic illustration of the construction of the leveling roll of the present invention;
wherein, 1, level roller surface middle part, 2, level roller surface both sides, 3, crackle, 4, parallel and level line, 5, chamfer line.
Detailed Description
The stainless steel surface is required to be leveled by a leveling machine in the final process of cold rolling the stainless steel strip, and if the leveling roller in the leveling machine has some defects, the stainless steel surface after passing through the leveling machine is still uneven and cannot meet the requirements.
In the actual use process, if the surface of the leveling roller has defects such as micro cracks, the detection is difficult, and the quality of the product is unqualified.
The embodiment provides a method for nondestructive detection and repair of surface cracks of a leveling roller, which comprises the following steps
Firstly, detecting whether cracks exist in the middle of the surface of the leveling roller by adopting eddy current inspection, wherein the middle of the surface of the leveling roller is an area formed by points with the distance of more than or equal to 50mm from a point on the effective surface of the leveling roller to the edge of the effective surface, and is shown in figure 1.
When the crack exists in the middle of the surface of the leveling roller, the crack can be repaired by a grooving method.
As shown in fig. 1, a crack 3 exists in the middle of the surface of the leveling roller, a grinding wheel is used for slotting the interior of the leveling roller at the roller surface defect position of the crack area, then eddy current flaw detection is carried out until the roller surface defect of the crack area does not exist any more, and then the whole roller surface is ground by the grinding wheel until the whole roller surface is flush with the slotting of the roller surface defect area of the crack area.
Note that: when the leveling roller repaired in the step is used, the leveling roller needs to be readjusted, installed and adjusted. In fact, in the repairing process, the leveling roller is necessarily required to be taken down and installed after being completely repaired, so that the leveling roller is not required to be emphasized in the patent.
And secondly, detecting whether cracks exist on two sides of the surface of the leveling roller by adopting dye penetrant inspection, wherein the two sides of the surface of the leveling roller refer to the areas of the effective surface of the leveling roller except the middle part of the surface of the leveling roller. In fact, is the area consisting of points on the active surface of the smoothing roller at a distance of less than 50mm from the edge of the active surface.
When cracks exist on the cracks and the two sides of the surface of the leveling roller, the crack areas on the two sides of the surface of the leveling roller can be repaired by a large chamfering method, chamfering is carried out by using a grinding wheel, then whether cracks exist in the crack areas on the two sides of the surface of the leveling roller or not is detected by adopting dye penetrant inspection, if the number of chamfering degrees is increased, chamfering is continuously carried out on the crack areas on the two sides of the surface of the leveling roller until cracks do not exist in the crack areas on the two sides of the surface of the leveling roller, and then chamfering is carried out on the non-crack areas on the two sides of the surface of the leveling roller by using the grinding wheel, wherein the chamfering is the same as that of the crack areas on the two sides of the surface of the leveling roller. The chamfer angle is generally about 45 degrees, but not more than 60 degrees, and the leveling roller needs to be replaced when the chamfer angle exceeds 60 degrees.
The condition that the quality is unqualified can be eliminated by using the roller surface micro-cracks which cannot be seen by naked eyes on a machine.
Claims (4)
1. A method for repairing surface cracks of a leveling roller and carrying out nondestructive testing is characterized by comprising the following steps: the method comprises the following steps
Detecting whether cracks exist in the middle of the surface of the leveling roller or not by adopting eddy current flaw detection and repairing the cracks in the middle of the surface of the leveling roller by a grooving method;
and detecting whether cracks exist on two sides of the surface of the leveling roller or not by adopting dye penetrant inspection, and repairing the cracks on the two sides of the surface of the leveling roller by adopting a large chamfering method.
2. The method for repairing cracks on the surface of the leveling roller and carrying out nondestructive testing on the surface of the leveling roller according to claim 1, wherein the method comprises the following steps: the middle part of the surface of the leveling roll refers to an area formed by points with the distance from a point on the effective surface of the leveling roll to the edge of the effective surface being more than or equal to 50mm, and the two sides of the surface of the leveling roll refer to the areas of the effective surface of the leveling roll except the middle part of the surface of the leveling roll.
3. The method for repairing cracks on the surface of the leveling roller and carrying out nondestructive testing on the surface of the leveling roller according to claim 1, wherein the method comprises the following steps: the step of repairing through a grooving method is that a grinding wheel is used for grooving the inner part of the leveling roller at the position of the roller surface defect of the crack area, then eddy current flaw detection is carried out until the roller surface defect of the crack area does not exist any more, and then the roller surface is integrally ground through the grinding wheel until the roller surface is entirely leveled with the grooving of the roller surface defect area of the crack area.
4. The method for repairing cracks on the surface of the leveling roller and carrying out nondestructive testing on the surface of the leveling roller according to claim 1, wherein the method comprises the following steps: the large chamfer method repairing means that crack areas on two sides of the surface of the leveling roller are chamfered by using a grinding wheel, then whether cracks exist in the crack areas on the two sides of the surface of the leveling roller or not is detected by adopting dye penetrant inspection, if the number of chamfer degrees is increased, the chamfer angles are continuously opened in the crack areas on the two sides of the surface of the leveling roller until the cracks do not exist in the crack areas on the two sides of the surface of the leveling roller, and then the non-crack areas on the two sides of the surface of the leveling roller are chamfered by using the grinding wheel, wherein the chamfer angles are the same as those in the crack areas on the two sides of the surface of the leveling roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110759447.7A CN113547281A (en) | 2021-07-06 | 2021-07-06 | Method for repairing surface cracks of leveling roller and performing nondestructive testing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110759447.7A CN113547281A (en) | 2021-07-06 | 2021-07-06 | Method for repairing surface cracks of leveling roller and performing nondestructive testing |
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| CN113547281A true CN113547281A (en) | 2021-10-26 |
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| CN202110759447.7A Pending CN113547281A (en) | 2021-07-06 | 2021-07-06 | Method for repairing surface cracks of leveling roller and performing nondestructive testing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2617883A (en) * | 2022-11-08 | 2023-10-25 | Univ Shanghai Maritime | An on-line monitoring system and a method of crack arresting via pulse current and crack state detecting using the same |
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Application publication date: 20211026 |
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