CN111624215A - Method for the non-destructive testing of internal assembly defects of a part - Google Patents
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- CN111624215A CN111624215A CN202010455294.2A CN202010455294A CN111624215A CN 111624215 A CN111624215 A CN 111624215A CN 202010455294 A CN202010455294 A CN 202010455294A CN 111624215 A CN111624215 A CN 111624215A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000007547 defect Effects 0.000 title claims abstract description 24
- 238000009659 non-destructive testing Methods 0.000 title abstract description 8
- 238000002591 computed tomography Methods 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 238000003325 tomography Methods 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 6
- 230000001066 destructive effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013527 convolutional neural network Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 230000005693 optoelectronics Effects 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/04—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
- G01T1/2914—Measurement of spatial distribution of radiation
- G01T1/2985—In depth localisation, e.g. using positron emitters; Tomographic imaging (longitudinal and transverse section imaging; apparatus for radiation diagnosis sequentially in different planes, steroscopic radiation diagnosis)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/30—Accessories, mechanical or electrical features
- G01N2223/33—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/646—Specific applications or type of materials flaws, defects
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Abstract
The invention relates to the field of nondestructive testing. The invention relates to a method for non-destructive testing of internal assembly defects of a part, said method comprising at least the following steps: a) determining at least one scanning angle for computer tomography suitable for the part to be detected according to the structure of the part to be detected; b) scanning the part to be measured at the at least one scanning angle by utilizing a computer tomography device to obtain a tomography image at each scanning angle in the at least one scanning angle; and c) analyzing the internal assembly state of the tested part according to the tomography image to determine whether an internal assembly defect exists. The detection method has wide applicability and high accuracy, particularly can accurately detect whether internal components of parts, particularly sealing rings are assembled in place or not, and meets the control requirements of vehicle enterprises on the quality of the parts.
Description
Technical Field
The invention relates to a method for non-destructive testing of internal assembly defects of a part.
Background
The seal ring is a common component that is commonly installed in a variety of devices and equipment. These seals are typically used to seal against fluids in a chamber and prevent the ingress of foreign objects, in different liquids and gases, at a given temperature and pressure, and in a static or moving state. If the seal ring is not installed in place during the manufacturing process, the sealing function of the entire device or apparatus may fail, thereby exposing the device or apparatus to the risk of fluid leakage or foreign object intrusion.
The prior art methods for detecting whether a seal ring is in place are generally of two types. One is by disassembling the equipment for viewing. However, this method has a drawback in that the mounting state is often damaged, and thus it is impossible to accurately determine whether the assembly of the seal ring is accurate and in place. Moreover, this method is not particularly suitable as an on-line inspection method integrated on a production line of parts or workpieces, due to the need to disassemble the equipment. Another method is to detect the tightness of the closed cavity, such as by pumping gas or liquid into the cavity and monitoring the gas or liquid loss rate or the pressure change in the cavity, to infer whether the seal ring is properly installed in the design position. However, this method inevitably has direct or indirect influence on the inside of the chamber, and thus has a limited range of applications.
The document "detection of assembly correctness of internal parts of complex structural components based on X-ray" (wutong et al, progress in laser and optoelectronics, 2018) discloses detection of missing mounting of parts based on a convolutional neural network classification recognition algorithm and a computed tomography detection technique. However, this approach requires the pre-construction of a data set for a particular workpiece, which is associated with considerable time and economic costs. Moreover, this method has a problem that it is difficult to accurately detect whether the inner member of the part is assembled in place.
The application of industrial CT to the detection of large complex casings (jiang shao qing, nondestructive testing, vol.39, No. 2 in 2017) discloses that the problems of conformity measurement of key dimensions and measurement of local wall thickness are solved by using image reconstruction and dimension measurement technologies. However, the method is suitable for detecting large and complex casings, and is not suitable for internal assembly defects in other occasions, particularly defects of whether internal components of parts are assembled in place or not.
Therefore, it is desirable to provide a technical solution which has a wide applicability and a high degree of accuracy, and which can accurately detect whether or not an internal member of a part is assembled in place, in particular.
Disclosure of Invention
This object is achieved by a method for non-destructive testing of internal assembly defects of a part according to the invention, comprising at least the following steps:
a) determining at least one scanning angle for Computed Tomography (CT) suitable for the part to be measured according to the structure of the part to be measured;
b) scanning the part to be measured at the at least one scanning angle by utilizing a computer tomography device to obtain a tomography image at each scanning angle in the at least one scanning angle; and
c) and analyzing the internal assembly state of the tested part according to the tomography image to determine whether internal assembly defects exist.
It is to be noted here that in the present context the term "part" should be understood broadly as any assembly of at least two components, which may or may not assume a certain function, and which may or may not have a final form.
It is noted here that in the context of the present text, the term "internal assembly defect" should be understood broadly as all possible assembly defects not visible from the outside of the part, including but not limited to: missing, shifting, assembly errors, no assembly in place, transposition and/or dislocation of internal components of the parts.
According to an alternative embodiment, step a) comprises at least the following steps:
a1) providing an image capable of reflecting the correct internal assembly state of the measured part;
a2) determining an assembly interface between an internal component to be detected and other components of the part to be detected according to the image; and
a3) determining the at least one scan angle based on the characteristics of the assembly interface, the at least one scan angle being set to: so that the tomographic image acquired at the at least one scanning angle can present the fitting state at the fitting interface.
According to an alternative embodiment, step a2) and step a3) are implemented as:
a 2') determining that the internal component to be detected of the part to be detected is easy to have a dangerous part which is not installed in place and/or a key part which can represent the assembling state of the internal component to be detected; and
a 3') setting the at least one scan angle for the assembly interface at the critical site and/or at the critical site.
According to an alternative embodiment, step a 2') is implemented as: the critical area and/or the critical area is determined based on the characteristics of the part to be tested, the technical experience of the person concerned and/or the part for which a problem has occurred.
According to an alternative embodiment, the characteristics of the assembly interface include the shape, position and/or orientation of the assembly interface.
According to an alternative embodiment, the image in step a1) is a design drawing of the part under test or a tomographic image of a qualified part under test obtained by means of a computed tomography technique.
According to an alternative embodiment, the occlusion of the assembly interface by the inner component to be detected itself and/or by other components of the part to be detected is taken into account when determining the scanning angle.
According to an alternative embodiment, step c) comprises at least the following steps:
c1) comparing the tomographic image acquired in step b) with an image reflecting the correct internal assembly state of the part to be tested, scan angle by scan angle; and
c2) if the difference exists between the two parts under at least one scanning angle, the conclusion that the tested part has the internal assembly defect related to the internal component to be tested is obtained; and otherwise, if the two parts do not have difference under each scanning angle, the conclusion that the detected part does not have the internal assembly defect related to the internal component to be detected is obtained.
According to an alternative embodiment, step c) further comprises the steps of:
if the fault scanning image of the tested part under a scanning angle is found to have difference with the image capable of reflecting the correct internal assembly state of the tested part, an additional scanning angle is further designed for executing supplementary scanning aiming at the position with the difference.
According to an alternative embodiment, the method is adapted to detect whether a sealing ring for closing the cavity is fitted in place, in particular, the at least one scanning angle comprises at least one scanning angle in a radial direction of the sealing ring.
The invention achieves the following beneficial technical effects:
belonging to non-destructive tests, so as not to affect and destroy the internal state of the chamber;
the problem of mounting the seal ring in the closed chamber or container can be accurately found;
the sealing ring mounting device can be integrated on a part production line, and each part is subjected to online inspection in the production process so as to ensure the accuracy of the mounting position of the sealing ring, thereby improving the product delivery quality and realizing the quality control of a vehicle enterprise on the product; and
the method can be used as a post analysis means for searching the fault source of a problem product, for example, the nondestructive testing method can be used for analyzing and judging the reason of water inflow when water inflow occurs in the use process of automobile parts, such as closed cavities of motors and the like.
Other advantages and advantageous embodiments of the inventive subject matter are apparent from the description, the drawings, and the claims.
Drawings
Further features and advantages of the present invention will be further elucidated by the following detailed description of an embodiment thereof, with reference to the accompanying drawings. The attached drawings are as follows:
FIG. 1 shows a flow diagram illustrating a method for non-destructive inspection of internal assembly defects of a part in accordance with an exemplary embodiment of the present invention;
FIG. 2 shows a flow diagram of one step of a method according to an exemplary embodiment of the invention;
FIG. 3 shows a flow chart of another step of a method according to an exemplary embodiment of the invention;
FIG. 4 shows a flowchart of an application example of a method according to an exemplary embodiment of the present invention;
FIG. 5 shows a photograph of a motor under test according to an exemplary embodiment of the present invention;
FIG. 6 shows a view of the three-dimensional design drawing of the motor under test shown in FIG. 5;
FIGS. 7A, 7B and 7C respectively show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image of the tested motor shown in FIG. 5 at a first scanning angle;
FIGS. 8A, 8B and 8C respectively show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image of the tested motor shown in FIG. 5 at a second scanning angle;
FIGS. 9A, 9B and 9C respectively show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image of the tested motor shown in FIG. 5 at a third scanning angle;
FIGS. 10A, 10B and 10C respectively show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image of the tested motor shown in FIG. 5 at a fourth scanning angle;
11A, 11B and 11C show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image, respectively, of the tested motor shown in FIG. 5 at a fifth scanning angle;
12A, 12B and 12C show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image, respectively, of the tested motor shown in FIG. 5 at a sixth scanning angle;
FIGS. 13A, 13B and 13C respectively show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image of the tested motor shown in FIG. 5 at a seventh scanning angle; and is
Fig. 14A, 14B and 14C show a design image, a two-dimensional CT projection image and a three-dimensional CT projection image of the measured motor shown in fig. 5 at an eighth scanning angle, respectively.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
FIG. 1 shows a flow diagram of a method for non-destructive inspection of internal assembly defects of a part, according to an exemplary embodiment of the present invention.
In step S1, at least one scan angle for computed tomography suitable for the part under test is determined based on the configuration of the part under test. According to an exemplary embodiment of the present invention, the step S1 includes at least the steps described below in conjunction with fig. 2.
In step S11, an image reflecting the correct internal assembly state of the part under test is acquired. The image may be, for example, a two-dimensional or three-dimensional design drawing of the part to be measured, or a tomographic image of a qualified part acquired by means of a computed tomography technique.
In step S12, an assembly interface between the internal component to be inspected and other components of the part under test, in particular a whole or part assembly interface of the internal component to be inspected, in particular a key assembly interface which can represent the assembly state of the internal component to be inspected, is determined based on the image.
In step S13, the at least one scan angle is determined according to the characteristics of the assembly interface, such as shape, position and orientation, the at least one scan angle being set to: so that the scanned image acquired by means of the computed tomography under the at least one scanning angle can comprehensively and clearly present the assembly state at the assembly interface.
In addition, possible shielding of the interior component to be detected and/or of other components of the component to be detected from the assembly interface can also be taken into account when determining the scanning angle.
According to an exemplary embodiment of the present invention, the steps S12 and S13 may be implemented as: the method comprises the steps of determining a dangerous part of an internal component to be detected, wherein the dangerous part is easy to be installed in a poor position, based on the characteristics (such as structure, materials and operation mode) of a part to be detected, the technical experience of related personnel and/or the part with problems, and designing at least one scanning angle for subsequent computed tomography according to an assembly interface at the dangerous part. By adopting the mode, targeted detection behaviors can be implemented, so that the detection efficiency can be improved. This is particularly advantageous for on-line inspection applications on a production line.
Next, in step S2, a scan is performed on the part under test at the at least one scan angle using a computed tomography apparatus, particularly an industrial CT apparatus, to obtain a tomographic image, e.g., a two-dimensional or three-dimensional projection map, at each of the at least one scan angle.
In step S3, the internal assembly state of the part under test is analyzed from the tomographic image to determine whether or not there is an assembly defect. According to an exemplary embodiment of the present invention, the step S3 includes at least the steps described below in conjunction with fig. 3.
In step S31, the tomographic image of the part under test acquired in step S2 and the image acquired in step S1 are compared angle by angle. If there is a difference between the two at least one scanning angle with respect to the assembly interface, then it is concluded in step S32 that the part under test has an assembly defect associated with the internal component to be inspected. On the contrary, if there is no difference between the two at each scanning angle, it is concluded in step S33 that the part under test has no assembly defect related to the internal member to be detected.
In an exemplary embodiment, step S3 may further include: if the fault scanning image of the tested part under a certain scanning angle is found to be possibly different from the fault scanning image (or design drawing) of the qualified part, an additional scanning angle can be further designed aiming at the different part to execute supplementary scanning, so that the assembling condition at the part can be more accurately detected and confirmed.
An exemplary application example of the method according to the invention is explained below in connection with fig. 4. In this example, the method is used to detect whether a closed cavity, in particular a motor 300 (see fig. 5), more particularly a sealing ring 310 in a motor for a sun blind for a door panel of a motor vehicle (see fig. 6), is fitted in place.
In step S211, a three-dimensional design drawing of the motor 300 under test is provided, which, as shown in fig. 6, depicts the proper assembly state of the gasket 310 in the motor 300.
In step S212, the correct mounting position of the gasket 310 in the motor 300 and the assembly interface of the gasket 310 with other motor components are determined according to the three-dimensional design drawing.
In step S213, at least one, for example, 8 scan angles for the computed tomography scan suitable for the seal ring 310 are set depending on the mounting position and the fitting interface of the seal ring 310.
In this example, the sealing ring 310 in the form of a ring should be arranged between the inner circumferential wall 320 and the outer circumferential wall 330 as designed. Thus, the assembly interface of the seal ring 310 with the circumferential walls 320 and 330 is primarily circumferentially extending. For this purpose, several, for example six, radial scanning angles (as shown in fig. 7A, 8A, 9A, 10A, 11A and 12A) are selected, since the radial scanning angles allow optimal viewing of the circumferentially extending assembly interface. In addition, a top scan angle (as shown in fig. 13A) and a bottom scan angle (as shown in fig. 14A) are provided to fully check the assembly of the sealing ring 310.
In step S220, the CT apparatus is used to perform scanning on the motor 300 under test at the eight scanning angles, and the projection views shown in FIGS. 7B-7C, 8B-8C, 9B-9C, 10B-10C, 11B-11C, and 12B-12C are obtained, respectively. In these projection views, the seal ring 310 and its surroundings are outlined in a circle.
In step S231, the projection drawing and the design drawing are compared angle by angle. It is found by comparison that the assembly state of the portion 400 captured by the seal ring 310 at the scanning angle shown in fig. 10 is significantly different from the correct assembly state shown in the design drawing. Thus, it is determined in step S232 that the seal ring 310 is not assembled in a correct manner, thereby resulting in poor sealability of the motor 300 under test.
This example implements: whether the water inlet of the motor is caused by the fact that the sealing ring is not installed in place can be verified under the condition that the motor is not disassembled or damaged.
The method for non-destructively detecting the internal assembly defect of the part according to the present invention is not limited to the detection of the assembly problem of the seal ring, but can be widely applied to the detection of various possible internal assembly defects in various occasions.
Although some embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. The appended claims and their equivalents are intended to cover all such modifications, substitutions and changes as fall within the true scope and spirit of the invention.
Claims (10)
1. A method for non-destructive inspection of internal assembly defects of a part, said method comprising at least the following steps:
a) determining at least one scanning angle for computer tomography suitable for the part to be detected according to the structure of the part to be detected;
b) scanning the part to be measured at the at least one scanning angle by utilizing a computer tomography device to obtain a tomography image at each scanning angle in the at least one scanning angle; and
c) and analyzing the internal assembly state of the tested part according to the tomography image to determine whether internal assembly defects exist.
2. Method according to claim 1, characterized in that step a) comprises at least the following steps:
a1) providing an image capable of reflecting the correct internal assembly state of the measured part;
a2) determining an assembly interface between an internal component to be detected and other components of the part to be detected according to the image; and
a3) determining the at least one scan angle based on the characteristics of the assembly interface, the at least one scan angle being set to: so that the tomographic image acquired at the at least one scanning angle can present the fitting state at the fitting interface.
3. The method according to claim 2, characterized in that step a2) and step a3) are carried out as:
a 2') determining that the internal component to be detected of the part to be detected is easy to have a dangerous part which is not installed in place and/or a key part which can represent the assembling state of the internal component to be detected; and
a 3') setting the at least one scan angle for the assembly interface at the critical site and/or at the critical site.
4. The method of claim 3,
step a 2') is performed as: the critical area and/or the critical area is determined based on the characteristics of the part to be tested, the technical experience of the person concerned and/or the part for which a problem has occurred.
5. The method according to any one of claims 2 to 4,
the characteristics of the assembly interface include the shape, location and/or orientation of the assembly interface.
6. The method according to any one of claims 2 to 5,
the image in step a1) is a design drawing of the part to be tested or a tomographic image of a qualified part to be tested obtained by means of a computed tomography technique.
7. The method according to any one of claims 2 to 6,
when the scanning angle is determined, the shielding of the internal component to be detected and/or other components of the part to be detected on the assembly interface is considered.
8. Method according to any of claims 2 to 7, characterized in that step c) comprises at least the following steps:
c1) comparing the tomographic image acquired in step b) with an image reflecting the correct internal assembly state of the part to be tested, scan angle by scan angle; and
c2) if the difference exists between the two parts under at least one scanning angle, the conclusion that the tested part has the internal assembly defect related to the internal component to be tested is obtained; and otherwise, if the two parts do not have difference under each scanning angle, the conclusion that the detected part does not have the internal assembly defect related to the internal component to be detected is obtained.
9. The method of claim 8, wherein step c) further comprises the steps of:
if the fault scanning image of the tested part under a scanning angle is found to have difference with the image capable of reflecting the correct internal assembly state of the tested part, an additional scanning angle is further designed for executing supplementary scanning aiming at the position with the difference.
10. The method according to any of the preceding claims,
the method is suitable for detecting whether an inner component of a part to be detected is assembled in place, particularly for detecting whether a sealing ring (310) for closing a cavity is assembled in place, and particularly the at least one scanning angle comprises at least one scanning angle along the radial direction of the sealing ring (310).
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| CN202010455294.2A CN111624215A (en) | 2020-05-26 | 2020-05-26 | Method for the non-destructive testing of internal assembly defects of a part |
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| CN202010455294.2A CN111624215A (en) | 2020-05-26 | 2020-05-26 | Method for the non-destructive testing of internal assembly defects of a part |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793317A (en) * | 2021-09-13 | 2021-12-14 | 合肥艾克斯特智能科技有限公司 | Plate part identification code spraying method |
| CN114782778A (en) * | 2022-04-25 | 2022-07-22 | 广东工业大学 | Assembly state monitoring method and system based on machine vision technology |
-
2020
- 2020-05-26 CN CN202010455294.2A patent/CN111624215A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793317A (en) * | 2021-09-13 | 2021-12-14 | 合肥艾克斯特智能科技有限公司 | Plate part identification code spraying method |
| CN114782778A (en) * | 2022-04-25 | 2022-07-22 | 广东工业大学 | Assembly state monitoring method and system based on machine vision technology |
| CN114782778B (en) * | 2022-04-25 | 2023-01-06 | 广东工业大学 | Assembly state monitoring method and system based on machine vision technology |
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