CN110307801B - Method for detecting out-of-roundness of large-diameter elbow pipe opening - Google Patents
Method for detecting out-of-roundness of large-diameter elbow pipe opening Download PDFInfo
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- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention belongs to the technical field of non-roundness detection of large-diameter elbow pipe orifices, and particularly discloses a non-roundness detection method of a large-diameter elbow pipe orifice, which comprises the following steps: step one, photographing an image of a pipe orifice of a bent pipe; secondly, preprocessing an image of the orifice of the bent pipe; step three, calculating the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe; step four, calculating out-of-roundness of the pipe orifice of the bent pipe; and step five, obtaining a rounding suggestion. The method for detecting the out-of-roundness of the orifice of the large-caliber bent pipe; the detection efficiency of the out-of-roundness of the elbow pipe orifice is greatly improved, the detection convenience of the out-of-roundness of the elbow pipe orifice is improved, the number of workers for detecting the out-of-roundness of the elbow pipe orifice is reduced, and the accuracy of the out-of-roundness detection of the elbow pipe orifice is improved; meanwhile, the specific circle rolling times and the reference circle rolling numerical value of the circle rolling procedure of the elbow pipe orifice are provided, and the circle rolling times of the elbow pipe orifice are reduced.
Description
Technical Field
The invention relates to the technical field of non-roundness detection of large-diameter elbow pipe orifices, in particular to a non-roundness detection method of a large-diameter elbow pipe orifice.
Background
In the pipeline engineering of the industries such as petroleum, chemical engineering, natural gas transportation, metallurgy, nuclear power stations, heat supply and the like, a large number of pipelines such as straight pipes, bent pipes and the like are in butt welding work, and the out-of-round pipe orifices can obviously reduce the welding quality and seriously affect the service life of the conveying pipelines. The long-term statistical results at home and abroad show that: the failure rate of the bent pipe is obviously higher than that of the straight pipe, on one hand, the problems exist in the metal material and the bent pipe process, for example: in the production process of the large-caliber steel hot-bending elbow, due to the clamping of the pipe orifice and the action of the internal stress of the pipe orifice, the pipe orifice is out of round, and the roundness of the pipe orifice of the elbow is unqualified. On the other hand, the stress state of the pipeline and the pipeline operating environment. Due to the existence of initial out-of-roundness, additional bending stress is generated under the action of internal pressure, so that the stress of the pipeline is not uniform, and the theoretical service life of the bent pipe is greatly influenced. Calculation shows that under the action of internal pressure, thermal expansion, external load bending moment, temperature difference and other factors, the circumferential stress of the bent pipe rises along with the increase of out-of-roundness, and when the circumferential stress reaches or exceeds a certain limit value, the creep failure process caused by the creep deformation of the pipeline in the circumferential direction of the section is accelerated. In addition, the roundness of the orifice of the bent pipe directly influences the subsequent groove processing of semi-finished products and the butt joint and welding of finished product pipelines. Therefore, the non-roundness of the bent pipe is an important index for testing the quality of the bent pipe, and is specified according to the national standard specification: the non-roundness of the bent pipe refers to the ratio of the difference between the maximum diameter and the minimum diameter on the same circular section of the bent part of the pipe to the nominal diameter, and the non-roundness of the bent pipe is a project which needs to be checked during manufacturing and installation of the bent pipe, so that the pipe orifice roundness calibration treatment is required after the bent pipe is bent, and the pipe orifice roundness is ensured to be not greater than the specified limit value.
In the prior art, "circle calibration" is a necessary process step in the production process of a hot-bending bend, and the circle calibration of the bend of the type is not mature in the aspects of production process, detection method and the like. Generally, the original methods are mostly adopted for domestic calibration of the out-of-roundness of the orifice of the large-diameter elbow in the following ways: the jack is placed at the edge of the inner wall of the pipe orifice, the pipe orifice out-of-roundness detection method is very crude in a mode of pressing by a manual operation jack, a measuring rule measuring method is mainly adopted, different measuring points need to be taken from the circumferential direction of the pipe orifice, the production efficiency is low, the detection result only has a qualitative concept but no quantitative conclusion, and the product quality cannot be guaranteed. The circular degree mode for rounding the pipe orifice of the bent pipe is high in labor intensity and low in working efficiency, and the problems that the production efficiency is low, the process is complicated and complicated, the energy consumption is high, the labor cost is high, the product precision is low and the like are directly caused due to the fact that the detection means is backward. The inventor develops a method for detecting out-of-roundness of the orifice of the large-caliber bent pipe based on the defects in the prior art, and can well solve the problems in the prior art.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides the method for detecting the out-of-roundness of the orifice of the large-diameter bent pipe, which is simple, scientific and reasonable in operation, convenient and fast to use and high in intelligent automation degree; according to the APP client side third-party application program based on the mobile phone, a camera of the mobile phone is aligned to a large-caliber pipe orifice to shoot, a circular shooting area on an APP client side interface is aligned to the large-caliber pipe orifice, the shot picture is subjected to graying processing and a pipe orifice contour mathematical model is extracted, the maximum diameter and the minimum diameter of the pipe orifice are calculated, images are stored at the same time, then digital information of the picture is transmitted to a database on a server through a wireless network, and the maximum diameter, the minimum diameter, the out-of-roundness, a system detection judgment result and rounding suggestion information of the pipe orifice of a bent pipe are displayed on the APP client side interface of the mobile phone through the processing of the database on the.
The invention provides a method for detecting out-of-roundness of a large-diameter elbow pipe orifice, which comprises the following steps:
step one, photographing an image of a pipe orifice of a bent pipe: opening a mobile phone APP client interface, aligning a camera of a mobile phone to a pipeline port, enabling the pipeline port displayed in the camera to fall into a circular picture shooting alignment area of the mobile phone APP client interface, and clicking a shooting key to perform freeze shooting; if the picture of the pipe orifice of the bent pipe is not shot well, a re-shooting key can be clicked, and the shooting action is repeated;
step two, preprocessing the image of the pipe orifice of the bent pipe: after the picture is shot in the step one in a freeze-frame mode, an operator presses a read-in picture on a mobile phone APP client side interface and operates a program key, digital information of the picture is transmitted to an image processing module on a server by using a mobile phone network, the image processing module performs gray processing, noise reduction processing and binarization processing on the picture of the orifice of the elbow pipe with colors, and an edge image of the orifice of the elbow pipe is extracted;
step three, calculating the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe: calculating the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe through an image processing module on a server according to the distance of the edge of the image of the pipe orifice of the bent pipe subjected to gray processing in the step two in the coordinate; the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe are respectively displayed in a maximum diameter display frame and a minimum diameter display frame on a mobile phone APP client interface;
step four, calculating out-of-roundness of the pipe orifice of the bent pipe: according to the specific numerical values of the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe in the third step, calculating the numerical value of the out-of-roundness coefficient K by using an out-of-roundness calculation formula, wherein the specific out-of-roundness coefficient value is directly displayed in an out-of-roundness display frame on the APP client interface of the mobile phone by the numerical value of the out-of-roundness coefficient K; meanwhile, the maximum diameter area of the elbow pipe orifice can be determined according to the maximum diameter of the elbow pipe orifice;
step five, obtaining a circle correction suggestion: inputting the numerical values of the maximum diameter, the minimum diameter and the out-of-roundness coefficient K of the elbow pipe orifice into the auxiliary design system of the pipe orifice roundness correction parameter in the third step and the fourth step, calculating by using the roundness correction expert database to obtain a judgment detection result and a roundness correction suggestion, and displaying the specific roundness correction suggestion in a detection judgment result display frame and a roundness correction suggestion display frame on the mobile phone APP client interface.
In the first step, the authority of calling a camera under a mobile phone is obtained, and meanwhile, the file management authority is obtained, so that the storage position after a photo is taken is convenient; and then, calling a camera to take a picture, and cutting the circle through a circle cutting algorithm after the picture is taken successfully, and storing the circle into a well-defined folder.
In the second step, after the image processing module on the server is used for carrying out gray scale processing on the picture of the pipe orifice of the bent pipe, the image processing module is used for carrying out noise processing on the picture of the pipe orifice of the bent pipe, and meanwhile, the picture of the pipe orifice of the bent pipe subjected to noise reduction processing is subjected to binarization processing, so that the picture of the pipe orifice of the bent pipe is changed into a binary image only having black and white dichroism.
In the third step, extracting pixel points of the image processed in the second step, and storing each coordinate of the pixel points in a matrix; traversing all data by an exhaustion method, and obtaining a numerical value of the maximum diameter every two data to obtain the maximum diameter value of the circular contour; the minimum value of the one stored in the same matrix is the minimum diameter.
In the fourth step, the out-of-roundness calculation formula is as follows: k = [ (Dmax-Dmin)/D ]. 100%; wherein K is the out-of-roundness factor; dmax is the maximum diameter of the orifice of the elbow; dmin is the minimum diameter of the orifice of the bent pipe; d is the nominal diameter.
In the fifth step, the circle calibration parameter aided design system combines the influence factor levels when the circle calibration processing is carried out as follows: parameters such as ambient temperature and wall thickness, the auxiliary design system for the pipe orifice roundness correction parameters based on the expert database, the recommended pipe orifice roundness correction technological parameters are automatically output after the parameters such as pipe orifice roundness deviation and the maximum diameter area are input, and the recommended pipe orifice roundness correction technological parameters are displayed through a mobile phone APP interface.
And in the fifth step, the roundness correction expert database finds out the regular influence relationship between each influence factor and process parameter and the pipe orifice deformation by analyzing the influence factors of the pipe orifice roundness correction processing deformation and combining the roundness correction process big data, establishes the roundness correction expert database, and imports the database information into the auxiliary roundness correction system.
In the fifth step, the roundness correction expert database assists the numerical values of the maximum diameter, the minimum diameter and the out-of-roundness coefficient K of the pipe orifice of the bent pipe input by the design system according to the roundness correction parameters; meanwhile, a circle correction expert database is used for calculating a judgment detection result and a circle correction suggestion by combining circle correction process parameters.
In the first step, the image of the opening of the bent pipe is photographed: opening a mobile phone APP client interface, aligning a camera of a mobile phone to a pipeline port, enabling the pipeline port displayed in the camera to fall into a circular picture shooting alignment area of the mobile phone APP client interface, and clicking a shooting key to perform freeze shooting; if the picture of the pipe orifice of the bent pipe is not shot well, a re-shooting key can be clicked, and the shooting action is repeated; the main purpose of doing so is to avoid the influence on the picture shooting quality of the elbow pipe orifice in the reflected light environment of the elbow pipe orifice; on the other hand can shoot the not good return bend mouth of pipe picture of quality again through the setting of key of shooing again to this improves the shooting quality of return bend mouth of pipe picture.
In the second step, after the picture is shot in the first step in a freeze-frame mode, an operator presses a read-in picture on a mobile phone APP client interface and runs a program key, digital information of the picture is transmitted to an image processing module on a server by using a mobile phone network, the image processing module performs gray processing, noise reduction processing and binarization processing on the picture of the orifice of the elbow pipe with colors, and an edge image of the orifice of the elbow pipe is extracted; the main purpose of doing so is to reduce the interference factors of the edge image of the bent pipe orifice extracted by the image processing module through the gray processing, the noise reduction processing and the binarization processing of the bent pipe orifice image. Because the image of the pipe orifice of the bent pipe cannot be influenced by environmental factors in the process of shooting the image, the image needs to be preprocessed, and the image is analyzed, processed and processed to meet the technical requirement of an image processing module for extracting pixels of the image of the pipe orifice of the bent pipe.
In the third step, extracting pixel points of the image processed in the second step, and storing each coordinate of the pixel points in a matrix; traversing all data by an exhaustion method, and obtaining a numerical value of the maximum diameter every two data to obtain the maximum diameter value of the circular contour; the minimum value of the one stored in the same matrix is the minimum diameter; the main purpose of doing so is to traverse all data by an exhaustive method through the image processing module according to the pixel points of the elbow pipe orifice, thereby finally calculating the maximum diameter and the minimum diameter of the elbow pipe orifice picture.
In the fourth step, according to the specific numerical values of the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe in the third step, a non-roundness calculation formula is utilized, wherein the non-roundness calculation formula is as follows: k = [ (Dmax-Dmin)/D ]. 100%; calculating a numerical value of the out-of-roundness coefficient K, wherein the numerical value of the out-of-roundness coefficient K directly displays a specific out-of-roundness coefficient value in an out-of-roundness display frame on a mobile phone APP client interface; meanwhile, the maximum diameter area of the elbow pipe orifice can be determined according to the maximum diameter of the elbow pipe orifice; the main purpose of doing so is to calculate out the out-of-roundness coefficient K of the elbow pipe orifice through the out-of-roundness calculation formula modeled in the image processing module, wherein the out-of-roundness coefficient K is smaller and the out-of-roundness of the elbow pipe orifice is more rounded, and the out-of-roundness coefficient K is larger and the out-of-roundness of the elbow pipe orifice is more rounded, so that rounding needs to be performed.
Inputting the numerical values of the maximum diameter, the minimum diameter and the out-of-roundness coefficient K of the elbow pipe orifice in the third step and the fourth step into an auxiliary design system for pipe orifice roundness correction parameters, calculating by using a roundness correction expert database to obtain a judgment detection result and a roundness correction suggestion, and displaying a specific roundness correction suggestion in a detection judgment result display frame and a roundness correction suggestion display frame on a mobile phone APP client interface; the main purpose of this is to accurately obtain the rounding recommendation for the elbow orifice.
The mobile phone APP client side has two important functions: on one hand, a circular picture shooting alignment area, a shooting key click and a re-shooting key are utilized to obtain a high-quality elbow pipe orifice image by utilizing a mobile phone APP client interface; on the other hand, as a carrier for transmitting and receiving the image, the image is transmitted to the server, an image processing module deployed on the server processes the image, and the intelligent processing program for processing the image result is presented to the user.
The invention has the beneficial effects that the invention provides the method for detecting the out-of-roundness of the orifice of the large-caliber bent pipe, and the method has simple, scientific and reasonable operation, convenient and fast use and high intelligent automation degree; the detection efficiency of the out-of-roundness of the elbow pipe orifice is greatly improved, the detection convenience of the out-of-roundness of the elbow pipe orifice is improved, the number of workers for detecting the out-of-roundness of the elbow pipe orifice is reduced, and the accuracy of the out-of-roundness detection of the elbow pipe orifice is improved; meanwhile, the specific circle rolling times and the reference circle rolling numerical value of the circle rolling procedure of the elbow pipe orifice are provided, and the circle rolling times of the elbow pipe orifice are reduced.
Drawings
FIG. 1 is a schematic diagram of a photographing interface display of a mobile phone APP client side according to the present invention;
FIG. 2 is a schematic diagram of a processing result interface of a mobile phone APP client according to the present invention;
FIG. 3 is a flow chart of the invention for rounding the pipe orifice of the bent pipe based on the client of the mobile phone APP;
the labels in the figure are: 1. cell-phone APP customer end interface, 2, the key of shooing, 3, the key of shooing again, 4, read in the picture and operate the program key, 5, withdraw from the program key, 6, the picture is shot the alignment area, 7, the maximum diameter display frame, 8, the minimum diameter display frame, 9, out-of-roundness display frame, 10, detection judgment result display frame, 11, school circle suggestion display frame.
Detailed Description
The invention is further described with reference to the following specific embodiments, and provides a method for detecting out-of-roundness of a large-diameter bent pipe orifice, comprising the following steps:
step one, photographing an image of a pipe orifice of a bent pipe: opening a mobile phone APP client interface 1, aligning a camera of a mobile phone to a pipeline port, enabling the pipeline port displayed in the camera to fall into a circular picture shooting alignment area 6 of the mobile phone APP client interface, and clicking a shooting key 2 to carry out freeze shooting; if the picture of the pipe orifice of the bent pipe is not shot well, the re-photographing key 3 can be clicked, and the photographing action is repeated;
step two, preprocessing the image of the pipe orifice of the bent pipe: after the picture is shot in a freeze-frame mode in the step one, an operator presses a read-in picture on a mobile phone APP client side interface 1 and operates a program key 2, digital information of the picture is transmitted to an image processing module on a server by using a mobile phone network, the image processing module performs gray processing, noise reduction processing and binarization processing on the picture of the orifice of the elbow pipe with colors, and an edge image of the orifice of the elbow pipe is extracted;
step three, calculating the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe: calculating the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe through an image processing module on a server according to the distance of the edge of the image of the pipe orifice of the bent pipe subjected to gray processing in the step two in the coordinate; the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe are respectively displayed in a maximum diameter display frame 5 and a minimum diameter display frame 6 on a mobile phone APP client interface 1 to form specific numerical values;
step four, calculating out-of-roundness of the pipe orifice of the bent pipe: according to the specific numerical values of the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe in the third step, calculating the numerical value of the out-of-roundness coefficient K by using an out-of-roundness calculation formula, wherein the specific out-of-roundness coefficient value is directly displayed in an out-of-roundness display frame 7 on the mobile phone APP client interface 1 by the numerical value of the out-of-roundness coefficient K; meanwhile, the maximum diameter area of the elbow pipe orifice can be determined according to the maximum diameter of the elbow pipe orifice;
step five, obtaining a circle correction suggestion: inputting the numerical values of the maximum diameter, the minimum diameter and the out-of-roundness coefficient K of the elbow pipe orifice into the auxiliary design system of the pipe orifice roundness correction parameter in the third step and the fourth step, calculating by using the roundness correction expert database to obtain a judgment detection result and a roundness correction suggestion, and displaying the specific roundness correction suggestion in a detection judgment result display frame 10 and a roundness correction suggestion display frame 11 on the mobile phone APP client interface 1.
In the first step, the authority of calling a camera under a mobile phone is obtained, and meanwhile, the file management authority is obtained, so that the storage position after a photo is taken is convenient; and then, calling a camera to take a picture, and cutting the circle through a circle cutting algorithm after the picture is taken successfully, and storing the circle into a well-defined folder.
In the second step, after the image processing module on the server is used for carrying out gray scale processing on the picture of the pipe orifice of the bent pipe, the image processing module is used for carrying out noise processing on the picture of the pipe orifice of the bent pipe, and meanwhile, the picture of the pipe orifice of the bent pipe subjected to noise reduction processing is subjected to binarization processing, so that the picture of the pipe orifice of the bent pipe is changed into a binary image only having black and white dichroism.
In the third step, extracting pixel points of the image processed in the second step, and storing each coordinate of the pixel points in a matrix; traversing all data by an exhaustion method, and obtaining a numerical value of the maximum diameter every two data to obtain the maximum diameter value of the circular contour; the minimum value of the one stored in the same matrix is the minimum diameter.
In the fourth step, the out-of-roundness calculation formula is as follows: k = [ (Dmax-Dmin)/D ]. 100%; wherein K is the out-of-roundness factor; dmax is the maximum diameter of the orifice of the elbow; dmin is the minimum diameter of the orifice of the bent pipe; d is the nominal diameter.
In the fifth step, the circle calibration parameter aided design system combines the influence factor levels when the circle calibration processing is carried out as follows: parameters such as ambient temperature and wall thickness, the auxiliary design system for the pipe orifice roundness correction parameters based on the expert database, the recommended pipe orifice roundness correction technological parameters are automatically output after the parameters such as pipe orifice roundness deviation and the maximum diameter area are input, and the recommended pipe orifice roundness correction technological parameters are displayed through a mobile phone APP interface.
And in the fifth step, the roundness correction expert database finds out the regular influence relationship between each influence factor and process parameter and the pipe orifice deformation by analyzing the influence factors of the pipe orifice roundness correction processing deformation and combining the roundness correction process big data, establishes the roundness correction expert database, and imports the database information into the auxiliary roundness correction system.
In the fifth step, the roundness correction expert database assists the numerical values of the maximum diameter, the minimum diameter and the out-of-roundness coefficient K of the pipe orifice of the bent pipe input by the design system according to the roundness correction parameters; meanwhile, a circle correction expert database is used for calculating a judgment detection result and a circle correction suggestion by combining circle correction process parameters.
The technical solution of the present invention is not limited to the above-mentioned scope, and the above description is only a preferred embodiment of the present invention, and any conventional modifications or equivalent substitutions made by those skilled in the art according to the above description are included in the protection scope of the present invention. The technical contents not described in detail in the present invention are all known techniques.
Claims (6)
1. A method for detecting out-of-roundness of a large-diameter elbow pipe opening comprises the following steps: the method is characterized in that: step one, photographing an image of a pipe orifice of a bent pipe: opening a mobile phone APP client interface, aligning a camera of a mobile phone to a pipeline port, enabling the pipeline port displayed in the camera to fall into a circular picture shooting alignment area of the mobile phone APP client interface, and clicking a shooting key to perform freeze shooting; if the picture of the pipe orifice of the bent pipe is not shot well, a re-shooting key can be clicked, and the shooting action is repeated; step two, preprocessing the image of the pipe orifice of the bent pipe: after the picture is shot in the step one in a freeze-frame mode, an operator presses a read-in picture on a mobile phone APP client side interface and operates a program key, digital information of the picture is transmitted to an image processing module on a server by using a mobile phone network, the image processing module performs gray processing, noise reduction processing and binarization processing on the picture of the orifice of the elbow pipe with colors, and an edge image of the orifice of the elbow pipe is extracted; step three, calculating the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe: calculating the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe through an image processing module on a server according to the distance of the edge of the image of the pipe orifice of the bent pipe subjected to gray processing in the step two in the coordinate; the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe are respectively displayed in a maximum diameter display frame and a minimum diameter display frame on a mobile phone APP client interface; step four, calculating out-of-roundness of the pipe orifice of the bent pipe: according to the specific numerical values of the maximum diameter and the minimum diameter of the pipe orifice of the bent pipe in the third step, calculating the numerical value of the out-of-roundness coefficient K by using an out-of-roundness calculation formula, wherein the specific out-of-roundness coefficient value is directly displayed in an out-of-roundness display frame on the APP client interface of the mobile phone by the numerical value of the out-of-roundness coefficient K; meanwhile, the maximum diameter area of the elbow pipe orifice can be determined according to the maximum diameter of the elbow pipe orifice;
step five, obtaining a circle correction suggestion: inputting the numerical values of the maximum diameter, the minimum diameter and the out-of-roundness coefficient K of the elbow pipe orifice into the auxiliary design system of the pipe orifice roundness correction parameter in the third step and the fourth step, calculating by using the roundness correction expert database to obtain a judgment detection result and a roundness correction suggestion, and displaying the specific roundness correction suggestion in a detection judgment result display frame and a roundness correction suggestion display frame on the mobile phone APP client interface.
2. The method for detecting the out-of-roundness of the orifice of the large-diameter elbow pipe according to claim 1, wherein the method comprises the following steps: in the first step, the authority of calling a camera under a mobile phone is obtained, and meanwhile, the file management authority is obtained, so that the storage position after a photo is taken is convenient; and then, calling a camera to take a picture, and cutting the circle through a circle cutting algorithm after the picture is taken successfully, and storing the circle into a well-defined folder.
3. The method for detecting the out-of-roundness of the orifice of the large-diameter elbow pipe according to claim 1, wherein the method comprises the following steps: in the second step, after the image processing module on the server is used for carrying out gray scale processing on the picture of the pipe orifice of the bent pipe, the image processing module is used for carrying out noise processing on the picture of the pipe orifice of the bent pipe, and meanwhile, the picture of the pipe orifice of the bent pipe subjected to noise reduction processing is subjected to binarization processing, so that the picture of the pipe orifice of the bent pipe is changed into a binary image only having black and white dichroism.
4. The method for detecting the out-of-roundness of the orifice of the large-diameter elbow pipe according to claim 1, wherein the method comprises the following steps: in the third step, extracting pixel points of the image processed in the second step, and storing each coordinate of the pixel points in a matrix; traversing all data by an exhaustion method, and obtaining a numerical value of the maximum diameter every two data to obtain the maximum diameter value of the circular contour; the minimum value of the one stored in the same matrix is the minimum diameter.
5. The method for detecting the out-of-roundness of the orifice of the large-diameter elbow pipe according to claim 1, wherein the method comprises the following steps: in the fourth step, the out-of-roundness calculation formula is as follows: k = [ (Dmax-Dmin)/D ]. 100%; wherein K is the out-of-roundness factor; dmax is the maximum diameter of the orifice of the elbow; dmin is the minimum diameter of the orifice of the bent pipe; d is the nominal diameter.
6. The method for detecting the out-of-roundness of the orifice of the large-diameter elbow pipe according to claim 1, wherein the method comprises the following steps: the circle calibration parameter aided design system combines the influence factor level when the circle calibration processing: and (3) parameters of ambient temperature and wall thickness, and automatically outputting recommended pipe orifice rounding process parameters after inputting pipe orifice out-of-roundness and maximum diameter region parameters to the pipe orifice rounding parameter aided design system based on the expert database, and displaying the parameters through a mobile phone APP interface.
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Application publication date: 20191008 Assignee: Luoyang wheel Technology Development Co.,Ltd. Assignor: LUOYANG INSTITUTE OF SCIENCE AND TECHNOLOGY Contract record no.: X2023980031952 Denomination of invention: A method for measuring the out-of-roundness of the large diameter elbow nozzle Granted publication date: 20201201 License type: Common License Record date: 20230209 |