CN110646509B - Nondestructive testing method for cutting edge of hob ring of tunnel boring machine - Google Patents
Nondestructive testing method for cutting edge of hob ring of tunnel boring machine Download PDFInfo
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- CN110646509B CN110646509B CN201910885154.6A CN201910885154A CN110646509B CN 110646509 B CN110646509 B CN 110646509B CN 201910885154 A CN201910885154 A CN 201910885154A CN 110646509 B CN110646509 B CN 110646509B
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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
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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
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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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
Abstract
A nondestructive testing method for the edge of a hob cutter ring of a tunnel boring machine belongs to the technical field of nondestructive testing, and aims to solve the problems that in the prior art, the hob cutter ring cannot realize nondestructive testing to obtain internal defect information, and further the problems that the boring process of the tunnel boring machine is unstable, the cost is high, and the progress of engineering construction is difficult to guarantee. The detection method of the invention respectively carries out flaw detection on four parts of the edge part radial direction, the edge part outer circumference circumferential direction, the cutter ring inner arc circumferential direction and the transition part of the edge part and the edge part of the cutter ring of the hob; the radial detection range of the edge part of the cutter ring is that the hob cutter ring is detected from the outer circumference to the cutter width within 20mm, and the detection mode adopts an ultrasonic flaw detector for nondestructive flaw detection; adopting an ultrasonic flaw detector for nondestructive flaw detection on the circumferential detection mode of the outer circumference of the blade part; adopting an ultrasonic flaw detector for nondestructive flaw detection on the circumferential detection mode of the inner circular arc of the cutter ring; the detection range of the transition position between the end part of the cutter ring and the blade part is to detect the position with the cutter width between 20mm and 30mm, and the detection mode adopts magnetic powder detection.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to a nondestructive testing method for a hob cutter ring edge of a tunnel boring machine.
Background
The hob ring is a key part of a cutter of a full-face tunnel boring machine, plays a role in lifting the tunnel boring machine in the boring process, and therefore is required to have comprehensive mechanical properties such as high hardness, high wear resistance, high impact toughness and the like, and the inside of the hob ring is not allowed to have the defects of cracks, inclusion, folding, scabbing, layered fracture, non-metal inclusion, carbide segregation, shrinkage pipe residue, cracking, uneven crystal grains and the like. Due to the existence of any defect, the hob ring can be subjected to abnormal wear, edge curling, edge breaking, fracture and other failure modes under extremely severe working environments. The focus of ultrasonic volume flaw detection on the disc cutter ring is the outer edge part which is a core area for breaking rock, and a high-abrasion area, if a volume internal defect exists, the disc cutter ring is easy to have brittle fracture or block collapse from outside to inside along the radial direction, so that the whole cutter fails. Due to the high stress area of the inner diameter base body part, which is subjected to radial load and is subjected to prestress by the interference hot sleeving, if a volume internal defect exists, the cutter ring of the hob is easy to generate brittle fracture from inside to outside along the radial direction, and the whole cutter fails. Therefore, the forged and formed cutter ring is of great importance for nondestructive inspection before leaving factory, and the cutter ring qualified through inspection is sent to a client to ensure the stable performance of the cutter ring in the subsequent tunneling process of the tunneling machine, reduce the tunneling cost and ensure the engineering construction progress. The detection technology of the hob ring is relatively difficult, and no detection rule and method for the test piece are available at present in China.
Disclosure of Invention
The invention aims to provide a nondestructive testing method for the edge of a hob cutter ring of a tunnel boring machine, which solves the problems that the hob cutter ring in the prior art cannot realize nondestructive testing to obtain internal defect information and further causes the problems that the boring process of the tunnel boring machine is unstable, the cost is high and the engineering construction progress is difficult to guarantee.
In order to achieve the purpose, the nondestructive testing method for the blade part of the hob ring of the tunnel boring machine comprises the following steps: performing flaw detection on four parts of the edge part of the cutter ring of the hob, the circumferential direction of the outer circumference of the edge part, the circumferential direction of the inner circular arc of the cutter ring and the transition part of the end part and the edge part of the cutter ring respectively;
the radial detection range of the edge part of the cutter ring is that the hob cutter ring is detected from the outer circumference to the cutter width within 20mm, and the detection mode adopts an ultrasonic flaw detector for nondestructive flaw detection;
adopting an ultrasonic flaw detector for nondestructive flaw detection on the circumferential detection mode of the outer circumference of the blade part;
adopting an ultrasonic flaw detector for nondestructive flaw detection on the circumferential detection mode of the inner circular arc of the cutter ring;
the detection range of the transition position between the end part of the cutter ring and the blade part is to detect the position with the cutter width between 20mm and 30mm, and the detection mode adopts magnetic powder detection.
The radial detection step of the cutting part of the hob ring is as follows:
1) adopting a reference block CS-2-4# as a standard AVG curve, setting an instrument detection range during detection, storing the current instrument state, setting the current instrument state into a blank data set, and recording a storage number;
2) detecting the radial direction of the edge part of the hob ring by an ultrasonic flaw detector; when a reflected echo is detected to appear between a start wave and a bottom wave, judging that a radial defect exists in the blade part of the cutter ring, when the defect echo reaches a first line of an AVG curve in the step 1), indicating that the defect exists in the blade part, wherein the defect is equivalent to the size of a phi 2 flat-bottom hole, when the echo reaches a second line of the AVG curve in the step 1), indicating that the defect exists in the blade part, wherein the defect is equivalent to the size of a phi 3 flat-bottom hole, and when the echo reaches a third line of the AVG curve in the step 1), indicating that the defect exists in the blade part, wherein the defect is equivalent to the; when no reflection echo appears between the initial wave and the bottom wave, the blade edge of the cutter ring has no radial defect.
The detection steps of the circumferential direction of the outer circumference of the edge part of the hob ring are as follows:
1) adopting a reference block CS-2-7# as a standard AVG curve, setting an instrument detection range during detection, storing the current instrument state, setting the current instrument state into a blank data set, and recording a storage number;
2) detecting the circumferential direction of the outer circumference of the edge part of the hob ring by using an ultrasonic flaw detector; when a reflected echo is detected to appear between a start wave and a bottom wave, the blade part of the cutter ring is considered to have a circumferential defect, when the defect echo reaches a first line of an AVG curve in the step 1), the defect with the size equivalent to a phi 2 flat-bottom hole is illustrated, when the echo reaches a second line of the AVG curve in the step 1), the defect with the size equivalent to a phi 3 flat-bottom hole is illustrated, and when the echo reaches a third line of the AVG curve in the step 1), the defect with the size equivalent to a phi 4 flat-bottom hole is illustrated; when no reflection echo appears between the initial wave and the bottom wave, the blade edge of the cutter ring has no circumferential defect.
The detection steps of the circumferential direction of the inner circular arc of the hob ring of the hob are as follows:
1) manufacturing a hob cutter comparison test block which has the same diameter as the inner circular arc of the hob cutter ring and an outer diameter larger than the outer diameter of the hob cutter ring to be tested, and manually setting defects on the hob cutter comparison test block;
2) manufacturing a DAC curve by using the hob reference block in the step 1) by using an ultrasonic flaw detector, and setting dB distance between three lines of the DAC curve and workpiece surface compensation;
3) carrying out flaw detection on the circumferential direction of an inner circular arc of a hob ring to be detected, and detecting the thickness of the hob ring, wherein reflection echoes appearing between 0mm and 90mm are defective waves; judging that the reflected echo is in a zone I, a zone II or a zone III of a DAC curve according to the position of the highest point of the reflected echo, and directly judging the waste when the reflected echo reaches or exceeds a waste judgment line; when the reflected echo is below the rejection line, whether the cutter ring is available or not is judged according to the requirements of the used standard.
The reference block is made of blank of annular forging of hob ring, a section of circular arc with the arc length of 200mm and the thickness of 80mm is taken, and is subjected to heat treatment along with the hob ring, the heat treatment black skin is removed, and the blank is processed into a smooth surface with the surface smoothness Ra of less than or equal to 6.3 mu m; phi 2 transverse through holes are arranged at the positions 10mm, 30mm, 50mm and 70mm away from the inner arc surface on the left side, and phi 2 transverse through holes are arranged at the positions 20mm, 40mm, 60mm and 80mm away from the inner arc surface on the right side.
The detection step to the cutter ring tip of hobbing cutter ring and cutting part transition department be:
1) the sensitivity of the D-type electromagnetic yoke is checked by using a standard test piece, and after the standard test piece shows magnetic marks, the sensitivity of the D-type electromagnetic yoke is proved to meet the requirement, and magnetic powder inspection can be carried out;
2) removing oil stains, burrs and scale substances on the surface of the detected cutter ring, and applying a contrast enhancer to the area to be detected;
3) one D-type electromagnetic yoke feeler is in surface contact with the end part of a detected cutter ring, the other D-type electromagnetic yoke feeler is in surface contact with the edge part of the detected cutter ring, is perpendicular to a detection surface at an angle of 45 degrees, is magnetized, and applies magnetic suspension for 1-3 s;
4) stopping magnetizing after stopping applying the magnetic suspension for at least 1 s; then rotating the D-type electromagnetic yoke by 90 degrees and magnetizing the D-type electromagnetic yoke again in a direction vertical to the detection surface;
5) repeating the steps 3) -4) at least once, observing the aggregation condition of the magnetic powder, and if the magnetic powder is aggregated to two ends of an antenna of the D-type electromagnetic yoke, indicating that the detection area of the cutter ring has no defects; if the magnetic powder is gathered at any position of the detection surface, the defect exists in the detection area of the cutter ring.
The invention has the beneficial effects that: the invention is a nondestructive testing method of the blade of a hob ring of a tunnel boring machine, which adopts two technologies of ultrasonic wave and magnetic particle inspection, wherein the ultrasonic inspection is only suitable for objects with regular shapes, when the invention inspects the flaw in the area within 20mm of the blade of the hob ring in the circumferential direction and the radial direction, the ultrasonic inspection technology is adopted, the transition arc part is not a main working surface, the structural shape of the area is special, the crystal grains are fine, the thickness change is large, but the maximum depth is not more than 6mm, therefore, the flaw detection is carried out by adopting the magnetic particle inspection technology, the defects of micro cracks and the like on the surface and the near surface of the hob ring can be detected, the two technologies are combined and used, the technical problem of nondestructive inspection of the blade of the irregular blade of the hob ring in the field is solved, a product with stable performance and reliable quality is provided for customers. The method is simple to operate and low in cost, and an ideal detection effect is achieved.
Drawings
FIG. 1 is a top view of a hob ring structure to be detected;
FIG. 2 is a front sectional view of a hob ring structure to be detected;
FIG. 3 is a schematic structural diagram of a reference block in the nondestructive testing method for the edge of the hob ring of the tunnel boring machine according to the present invention;
FIG. 4 is a schematic diagram illustrating detection of the edge of the cutter ring by the nondestructive testing method for the edge of the hob cutter ring of the tunnel boring machine according to the present invention;
FIG. 5 is a schematic diagram of magnetic particle inspection in the nondestructive testing method for the edge of the hob ring of the tunnel boring machine
Wherein: 1. the cutter ring comprises a cutter ring edge part 2, a cutter ring edge part outer circumference 3, a cutter ring inner arc 4, a transition part 5, a cutter ring end part 6, a D-type electromagnetic yoke 601 and a feeler; 7. hobbing cutter reference block, 701, horizontal through hole.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The hob ring has a special structural shape, so that no test rules of the test piece exist at present in China, the technical difficulty is high, the domestic parallel analysis and research shows that the technical problem cannot be solved only by ultrasonic flaw detection, and two technologies of ultrasonic flaw detection and magnetic particle flaw detection need to be used simultaneously.
Referring to the attached drawings 1 and 2, the nondestructive testing method for the blade part 1 of the hob cutter ring of the tunnel boring machine comprises the following steps: flaw detection is respectively carried out on four positions of the edge part 1 of the cutter ring of the hob, the circumferential direction of the outer circumference 2 of the edge part, the circumferential direction of the inner arc 3 of the cutter ring and the transition part 4 of the end part 5 of the cutter ring and the edge part;
the radial detection range of the edge part 1 of the cutter ring is that the hob cutter ring is detected from the outer circumference to the cutter width within 20mm, and the detection mode adopts an ultrasonic flaw detector for nondestructive flaw detection;
the circumferential detection mode of the outer circumference 2 of the blade part adopts an ultrasonic flaw detector for nondestructive flaw detection;
adopting an ultrasonic flaw detector for nondestructive flaw detection on the circumferential detection mode of the inner circular arc 3 of the cutter ring;
the detection range of the transition part 4 between the end part 5 of the cutter ring and the edge part is to detect the part with the cutter width between 20mm and 30mm, and the detection mode adopts magnetic powder detection.
The radial detection step of the cutting part of the hob ring is as follows:
1) adopting a reference block CS-2-4# as a standard AVG curve, setting an instrument detection range during detection, storing the current instrument state, setting the current instrument state into a blank data set, and recording a storage number;
2) detecting the edge part of the hob ring radially by using an ultrasonic flaw detector, and calling a set flaw detection process from the ultrasonic flaw detector; when a reflected echo is detected to appear between a starting wave and a bottom wave, judging that the blade part 1 has a radial defect, when the defect echo reaches a first line of an AVG curve in the step 1), indicating that the defect has the size equivalent to a phi 2 flat-bottom hole, when the echo reaches a second line of the AVG curve in the step 1), indicating that the defect has the size equivalent to a phi 3 flat-bottom hole, and when the echo reaches a third line of the AVG curve in the step 1), indicating that the defect has the size equivalent to a phi 4 flat-bottom hole; when no reflection echo appears between the initial wave and the bottom wave, the knife ring blade 1 has no radial defect.
The detection steps of 2 circumferences of the outer circumference of the cutting part of the hob ring are as follows:
1) adopting a reference block CS-2-7# as a standard AVG curve, setting an instrument detection range during detection, storing the current instrument state, setting the current instrument state into a blank data set, and recording a storage number;
2) detecting the circumferential direction of the outer circumference 2 of the edge part of the hob ring by using an ultrasonic flaw detector, and calling a set flaw detection process from the ultrasonic flaw detector; when a reflected echo is detected to appear between a start wave and a bottom wave, the cutter ring blade 1 is considered to have a circumferential defect, when the defect echo reaches a first line of an AVG curve in the step 1), the defect with the size equivalent to a phi 2 flat-bottom hole is shown, when the echo reaches a second line of the AVG curve in the step 1), the defect with the size equivalent to a phi 3 flat-bottom hole is shown, and when the echo reaches a third line of the AVG curve in the step 1), the defect with the size equivalent to a phi 4 flat-bottom hole is shown; when no reflection echo appears between the initial wave and the bottom wave, the knife ring blade 1 has no circumferential defect.
The detection steps of the circumferential direction of the cutter ring inner circular arc 3 of the hob cutter ring are as follows:
1) referring to the attached figure 3, a hob comparison test block 7 which has the same diameter as the inner circular arc of the hob ring and the outer diameter of which is larger than the outer diameter of the hob ring to be tested is manufactured, and a defect is manually arranged on the hob comparison test block 7;
2) manufacturing a DAC curve by using the hob comparison test block 7 in the step 1) by using an ultrasonic flaw detector, and setting dB distance between three lines of the DAC curve and workpiece surface compensation;
3) carrying out flaw detection on the circumferential direction of an inner circular arc 3 of the hob ring to be detected, wherein the thickness (generally 90mm) of the hob ring is detected, and all reflected echoes appearing between 0mm and 90mm are defective waves; judging that the reflected echo is in a zone I, a zone II or a zone III of a DAC curve according to the position of the highest point of the reflected echo, and directly judging the waste when the reflected echo reaches or exceeds a waste judgment line; when the reflected echo is below the rejection line, whether the cutter ring is available or not is judged according to the requirements of the used standard.
The reference block is made of blank of annular forging of hob ring, a section of circular arc with the arc length of 200mm and the thickness of 80mm is taken, and is subjected to heat treatment along with the hob ring, the heat treatment black skin is removed, and the blank is processed into a smooth surface with the surface smoothness Ra of less than or equal to 6.3 mu m; phi 2 lateral through holes 701 are provided at positions 10mm, 30mm, 50mm and 70mm from the inner circular arc surface on the left side, and phi 2 lateral through holes 701 are provided at positions 20mm, 40mm, 60mm and 80mm from the inner circular arc surface on the right side.
Referring to the attached figure 4, the magnetic powder inspection is adopted for the part of the TBM cutter ring between 20mm and 30mm of the blade width, the magnetic powder inspection can reach the position 6mm away from the surface, and the distance between A and B in the embodiment is (31-29)/2 which is 1mm, so that the magnetic powder inspection detection condition is completely met. The detection steps of the cutter ring end part 5 and the blade part transition part 4 of the hob cutter ring are as follows:
1) the magnetic powder detection is adopted, the detection method adopts a continuous method, the magnetization method adopts a magnetic yoke method, a standard test piece is used for detecting the sensitivity of the D-shaped electromagnetic yoke 6 in operation, and after the standard test piece shows magnetic marks, the sensitivity of the standard test piece is proved to meet the requirement, and the magnetic powder inspection can be carried out;
2) removing oil stains, burrs and scale substances on the surface of the detected cutter ring, and applying a contrast enhancer to the area to be detected;
3) one of the feelers 601 of the D-type electromagnetic yoke 6 is in surface contact with the 5 surface of the end part of the detected cutter ring, the other feeler is in surface contact with the 1 surface of the edge part of the detected cutter ring, the feeler is perpendicular to the detection surface at 45 degrees with reference to the attached drawing 5, magnetization is carried out, and magnetic suspension is applied for 1-3 s;
4) stopping magnetizing after stopping applying the magnetic suspension for at least 1 s; then the D-type electromagnetic yoke 6 is rotated by 90 degrees and is perpendicular to the detection surface for magnetization again;
5) in order to prevent missing detection and ensure the magnetization effect, repeating the steps 3) -4) at least once until the area to be detected on the upper surface of the cutter ring is completely covered; observing the aggregation condition of the magnetic powder, and if the magnetic powder is aggregated to two ends of an antenna 601 of the D-shaped electromagnetic yoke 6, indicating that the detection area of the cutter ring has no defects; if the magnetic powder is gathered at any position of the detection surface, the defect exists in the detection area of the cutter ring.
Claims (2)
1. A nondestructive testing method for the edge part of a hob cutter ring of a tunnel boring machine is characterized by comprising the following steps: flaw detection is respectively carried out on four parts of the edge part (1) of the hob ring, the circumferential direction of the outer circumference (2) of the edge part, the circumferential direction of the inner arc (3) of the hob ring and the transition part (4) of the edge part and the end part (5) of the hob ring;
the radial detection range of the edge part (1) of the cutter ring is that the hob ring is detected from the outer circumference to the cutter width within 20mm, and the detection mode adopts an ultrasonic flaw detector for nondestructive flaw detection;
the circumferential detection mode of the outer circumference (2) of the blade part adopts an ultrasonic flaw detector for nondestructive flaw detection;
the circumferential detection mode of the inner circular arc (3) of the cutter ring adopts an ultrasonic flaw detector for nondestructive flaw detection;
the detection range of the transition part (4) between the end part (5) and the blade part of the cutter ring is that the part with the cutter width of 20mm-30mm is detected, and the detection mode adopts magnetic powder detection;
the radial detection step of the cutting part of the hob ring is as follows:
1) adopting a reference block CS-2-4# as a standard AVG curve, setting an instrument detection range during detection, storing the current instrument state, setting the current instrument state into a blank data set, and recording a storage number;
2) detecting the radial direction of the edge part of the hob ring by an ultrasonic flaw detector; when a reflected echo is detected to appear between a starting wave and a bottom wave, judging that the cutter ring blade (1) has a radial defect, when the defect echo reaches a first line of an AVG curve in the step 1), indicating that the defect has a size equivalent to a phi 2 flat-bottom hole, when the echo reaches a second line of the AVG curve in the step 1), indicating that the defect has a size equivalent to a phi 3 flat-bottom hole, and when the echo reaches a third line of the AVG curve in the step 1), indicating that the defect has a size equivalent to a phi 4 flat-bottom hole; when no reflection echo appears between the initial wave and the bottom wave, the blade part (1) of the cutter ring has no radial defect;
the detection steps of the circumferential direction of the outer circumference (2) of the edge part of the hob ring are as follows:
1) adopting a reference block CS-2-7# as a standard AVG curve, setting an instrument detection range during detection, storing the current instrument state, setting the current instrument state into a blank data set, and recording a storage number;
2) detecting the circumferential direction of the outer circumference (2) of the edge part of the hob ring by an ultrasonic flaw detector; when a reflected echo is detected to appear between a starting wave and a bottom wave, the cutter ring blade (1) is considered to have a circumferential defect, when the defect echo reaches a first line of an AVG curve in the step 1), the defect with the size equivalent to a phi 2 flat-bottom hole is shown, when the echo reaches a second line of the AVG curve in the step 1), the defect with the size equivalent to a phi 3 flat-bottom hole is shown, and when the echo reaches a third line of the AVG curve in the step 1), the defect with the size equivalent to a phi 4 flat-bottom hole is shown; when no reflection echo appears between the initial wave and the bottom wave, the blade part (1) of the cutter ring has no circumferential defect;
the circumferential detection steps of the inner circle arc (3) of the hob ring of the hob are as follows:
1) manufacturing a hob comparison test block (7) which has the same diameter as the inner circular arc of the hob ring and an outer diameter larger than the outer diameter of the hob ring to be tested, and manually setting defects on the hob comparison test block (7);
2) an ultrasonic flaw detector is adopted to make a DAC curve by using the hob comparison test block (7) in the step 1), and the dB distance between three lines of the DAC curve and the workpiece surface compensation are set;
3) carrying out flaw detection on the circumferential direction of an inner circular arc (3) of the hob ring to be detected, and detecting the thickness of the hob ring, wherein reflected echoes appearing between 0mm and 90mm are defective waves; judging that the reflected echo is in a zone I, a zone II or a zone III of a DAC curve according to the position of the highest point of the reflected echo, and directly judging the waste when the reflected echo reaches or exceeds a waste judgment line; when the reflected echo is below the rejection line, judging whether the cutter ring is available according to the requirements of the used standard;
the detection steps of the transition part (4) between the cutter ring end part (5) and the blade part of the hob cutter ring are as follows:
1) the sensitivity of the D-type electromagnetic yoke (6) is checked by using a standard test piece, and after the standard test piece shows magnetic marks, the sensitivity is proved to meet the requirement, and magnetic powder inspection can be carried out;
2) removing oil stains, burrs and scale substances on the surface of the detected cutter ring, and applying a contrast enhancer to the area to be detected;
3) one antenna (601) of the D-type electromagnetic yoke (6) is in surface contact with the end part (5) of the detected cutter ring, the other antenna is in surface contact with the blade part (1) of the detected cutter ring, the angle of the other antenna is 45 degrees and is vertical to the detection surface, magnetization is carried out, and magnetic suspension is applied for 1 s-3 s;
4) stopping magnetizing after stopping applying the magnetic suspension for at least 1 s; then the D-shaped electromagnetic yoke (6) is rotated by 90 degrees and is perpendicular to the detection surface for magnetization again;
5) repeating the steps 3) to 4) at least once, observing the aggregation condition of the magnetic powder, and if the magnetic powder is aggregated to two ends of an antenna (601) of a D-type electromagnetic yoke (6), indicating that the detection area of the cutter ring has no defects; if the magnetic powder is gathered at any position of the detection surface, the defect exists in the detection area of the cutter ring.
2. The nondestructive testing method for the blade part of the hob ring of the tunnel boring machine according to claim 1, wherein the reference block is made of a blank of an annular forging of the hob ring, a section of arc with an arc length of 200mm and a thickness of 80mm is taken, and is subjected to heat treatment along with the hob ring, so that a heat-treated black skin is removed, and a smooth surface with a surface finish degree Ra of less than or equal to 6.3 μm is processed; phi 2 transverse through holes (701) are arranged at positions 10mm, 30mm, 50mm and 70mm away from the inner arc surface on the left side, and phi 2 transverse through holes (701) are arranged at positions 20mm, 40mm, 60mm and 80mm away from the inner arc surface on the right side.
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| JPH08201355A (en) * | 1995-01-20 | 1996-08-09 | Akebono Brake Ind Co Ltd | Defect detecting method for friction material |
| CN1818640A (en) * | 2006-03-03 | 2006-08-16 | 广州市盾建地下工程有限公司 | Cutter wear inspection during tunnelling process of tunnel tunneller |
| CN103226151B (en) * | 2013-01-25 | 2016-06-22 | 中南大学 | A kind of development machine cutterhead disk cutter colony's operating state monitoring system and method |
| CN206299383U (en) * | 2016-12-30 | 2017-07-04 | 葫芦岛力天重工机械有限公司 | Rock tunnel(ling) machine point sword hob-cutter structure |
| CN206959810U (en) * | 2017-06-08 | 2018-02-02 | 四川汇智众创科技有限公司 | A kind of shield machine roller cutter wears amount detecting device |
| CN207813619U (en) * | 2017-12-26 | 2018-09-04 | 四川广正科技有限公司 | A kind of combination cutter ring of disc cutter for rock tunnel(ling) machine |
| CN110017147A (en) * | 2019-05-09 | 2019-07-16 | 中国电建集团铁路建设有限公司 | A kind of shield cutter abrasion real-time monitoring system and monitoring method |
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