Detection method and detection device for boundary dimension of forge piece

Abstract

The invention discloses a detection method and detection device for the boundary dimension of a forge piece. The detection device comprises a rack, and an annular detection frame and a driving module are arranged on the rack in a sliding mode; a detection module is arranged on the annular detection frame, and a clamping module and a controller are arranged on the rack; the controller is electrically connected with the driving module and the detection module. The invention also discloses a corresponding defect detection method. The method comprises the following steps: firstly, setting a standard comparison model and standard detection parameters; then respectively acquiring a standard surface point coordinate set and an actual distance parameter set, calculating an actual surface point coordinate set according to the actual distance parameter set, and matching the standard surface point coordinate set with the actual surface point coordinate set; and finally, comparing according to the standard comparison model, and outputting a detection result. Omnibearing measurement of the surface size of the forge piece is achieved through the annular detection frame, the full-size point cloud picture is generated, the detection precision is high, and meanwhile automatic data collection is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection equipment, in particular to a detection method and a detection device for the shape size of a forged piece. BACKGROUND

[0002] Forging is an important metal processing method in the prior art, and the basic principle of forging is the principle of constant volume and the flowability of metal. Due to the unevenness of metal flow in the forging process, some areas may lack material, and some areas may have excess defects. For the above defects, the prior art generally uses a customized caliper for manual review measurement, which not only has low measurement efficiency, but also has low detection accuracy. SUMMARY

[0003] The main purpose of the present application is to provide a detection method and a detection device for the shape size of a forged piece, aiming to solve the defect of low detection accuracy in the prior art.

[0004] The present application achieves the above-mentioned purpose through the following technical solutions: A detection method for the shape size of a forged piece, comprising the following steps: Setting a standard comparison model and standard detection parameters; Obtaining a standard surface point coordinate set of a standard forged piece, wherein the standard surface point coordinate set is calculated based on the standard detection parameters; Obtaining an actual distance parameter set of a forged piece to be detected, and calculating an actual surface point coordinate set according to the actual distance parameter set; wherein the actual distance parameter set is tested based on the standard detection parameters; Matching the standard surface point coordinate set and the actual surface point coordinate set to generate a plurality of comparison calculation groups; Comparing each comparison calculation group according to the standard comparison model, and outputting a detection result.

[0005] Optionally, the calculation expression of the actual surface point coordinate set is ; wherein i represents the sampling point number, t represents the sampling time number, R represents the initial distance of each sampling point, represents the actual distance parameter, represents the deflection polar angle of the sampling point numbered i, and the calculation formula is N represents the total number of sampling points.

[0006] Optionally, the calculation expression of the standard comparison model is , wherein represents the radial deviation, and the expression is : represents the polar radius coordinate of the standard surface point, polar coordinate representing the actual surface point; and respectively represent the allowed upper deviation value and the allowed lower deviation value of the radial deviation; the standard detection parameter includes a sampling period T and a sampling speed v.

[0007] Optionally, the standard surface point coordinate set of the standard forging is acquired, including the following steps: a standard polar coordinate system and a standard three-dimensional numerical model of the standard forging are constructed; the positions of the standard surface points are determined by segmentally taking points on the standard three-dimensional numerical model according to the standard detection parameter; the standard surface point coordinate set is determined according to the positions of the standard surface points and the size parameters of the forging.

[0008] Optionally, the standard surface point coordinate set and the actual surface point coordinate set are matched to generate a plurality of comparison calculation groups, including the following steps: the standard surface point coordinate set and the actual surface point coordinate set are acquired; a one-to-one mapping relationship is established between the standard surface point coordinate set and the actual surface point coordinate set according to the sampling time number and the sampling point position number; the corresponding standard surface points and the actual surface points are collected into the same calculation group according to the one-to-one mapping relationship to generate the comparison calculation group.

[0009] Correspondingly, the application also discloses a detection device based on the above detection method, which comprises a rack; a ring-shaped detection frame is slidingly arranged on the rack; a driving module connected with the ring-shaped detection frame in power is further arranged on the rack; a detection module is arranged on the inner wall of the ring-shaped detection frame, and the detection module is used for acquiring the actual distance parameter of the forging to be detected; a clamping module is arranged on the rack, and the clamping module is used for fixing the forging to be detected; a controller is electrically connected with the driving module and the detection module.

[0010] Optionally, a slide rail is arranged on the rack, a base is slidingly arranged on the slide rail, the ring-shaped detection frame is connected with the base; the driving module comprises a driving motor and a driving screw connected in power, and the driving screw is connected with the base in screw thread.

[0011] Optionally, the detection module comprises a plurality of infrared distance sensors, the ring-shaped detection frame is uniformly provided with mounting holes, each infrared distance sensor is arranged in each mounting hole, and the extension lines of the detection directions of the infrared distance sensors intersect at the center of the ring-shaped detection frame.

[0012] Optionally, the clamping module includes a first adjusting rail and a second adjusting rail, which are located at opposite ends of the annular testing frame along the axial direction of the frame. Clamping seats for fixing the forging to be tested are slidably arranged on both the first and second adjusting rails.

[0013] Optionally, each of the two clamping seats has a pin on its opposite side, and the two pins and the annular detection frame are coaxially arranged.

[0014] Compared with the prior art, this application has the following beneficial effects: This application includes a frame, on which a ring-shaped detection frame and a drive module for driving the ring-shaped detection frame are slidably disposed; a detection module for acquiring the actual distance parameters of the forging to be inspected is disposed on the ring-shaped detection frame; a clamping module and a controller are disposed on the frame; the clamping module is used to fix the forging to be inspected; the controller is electrically connected to the drive module and the detection module respectively. Accordingly, this application also discloses a corresponding defect detection method. First, a standard comparison model and standard detection parameters are set. Then, a standard surface point coordinate set and an actual distance parameter set are obtained respectively. The actual surface point coordinate set is calculated based on the actual distance parameter set. Then, the standard surface point coordinate set and the actual surface point coordinate set are matched to generate several comparison calculation groups. Finally, each calculation group is compared according to the standard comparison model, and the detection results are output. This application arranges the detection device around the axis of the forging to be inspected using a ring-shaped detection frame, thereby achieving comprehensive coverage detection of the entire surface of the forging. By connecting the various measurement points in the same sampling period in series, the contour curve of a certain cross section can be obtained. Combined with the axial sliding of the ring-shaped detection frame under the control of the drive module, relevant parameters of different end faces can be continuously collected, and finally, the positioning of different cross sections can be achieved by sampling time and moving speed, thereby generating a full-size point cloud map of the forging. When a certain area of ​​the forging is short of material, the actual surface point coordinates at the same point will shift towards the axis of the forging relative to the standard surface point coordinates, and the actual surface point coordinates will be smaller than the standard surface point coordinates; conversely, the parameters will be larger. If it is qualified, the parameter deviation will be zero or within the allowable deviation range. By comparing the above parameters, it is possible to quickly determine which areas of the forging have a shortage of material and which areas have an excess, thereby quickly identifying the forging status of the entire forging.

[0015] Secondly, this application achieves accurate distance measurement through an infrared distance sensor. At the same time, the point cloud density can be controlled by controlling the sampling period, the number of infrared distance sensors, and the moving speed, thereby realizing the manual adjustment of sampling accuracy to meet different sampling accuracy requirements and improve detection accuracy. Finally, compared with the prior art, the technical solution described in this application can realize the dimensional inspection of forgings. Compared with the fixed-point inspection of some key areas in the prior art, its inspection parameters are more comprehensive. Therefore, it can judge the processing quality of the entire forging, and its inspection results are more accurate and comprehensive. At the same time, since this application realizes non-contact and automated inspection through equipment, it not only has higher inspection efficiency, but also avoids damage to forgings caused by contact inspection. Attached Figure Description

[0016] Figure 1 A flowchart illustrating a method for detecting the external dimensions of a forging, provided in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the standard polar coordinate system; Figure 3 This is a schematic diagram of the structure of a detection device provided in Embodiment 2 of this application; Figure 4 An exploded view of a detection device provided in Embodiment 2 of this application; Figure 5 A cross-sectional view of a detection device provided in Embodiment 2 of this application; Reference numerals: 1-Frame, 2-Ring detection frame, 3-Controller, 4-Slide rail, 5-Base, 6-Drive motor, 7-Drive screw, 8-Infrared distance sensor, 9-Mounting hole, 10-First adjustment rail, 11-Second adjustment rail, 12-Clamping seat, 13-Ejector pin, 14-Slotted photoelectric sensor, 15-Telescopic adjustment rod, 16-Baffle.

[0017] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] Implementation Method 1 Reference Figures 1 to 2 This embodiment, as an optional embodiment of this application, discloses a method for detecting the external dimensions of forgings, including the following steps: S1. Set the standard comparison model and standard detection parameters; The calculation expression for the standard alignment model is as follows: ,in Representing radial deviation, its expression is: : and These represent the upper and lower allowable deviation values ​​for radial deviation, respectively; the standard detection parameters include the sampling period T and the sampling speed v. The standard detection parameters mentioned above are confirmed according to the actual situation, or the system preset parameters can be used; the sampling period T specifically refers to the sampling period of the infrared distance sensor, and the sampling speed v refers to the moving speed of the annular detection frame along the axial direction of the forging; S2. Obtain the standard surface point coordinate set of the standard forging, wherein the standard surface point coordinate set is calculated based on the standard detection parameters; S21. Construct a standard polar coordinate system and a standard three-dimensional digital model of a standard forging; A standard polar coordinate system is constructed, the origin of which is preferably the center of the annular detection frame. Since the positions of each infrared detection device are fixed, their polar angles remain constant. (See specific details...) Figure 2 ; A standard three-dimensional digital model was then constructed based on the standard dimensions of the forging. S22. Based on the standard detection parameters, segment points are taken on the standard three-dimensional digital model to determine the position of each standard surface point; Set standard detection parameters, namely, set the sampling period T and sampling speed v; Subsequently, points are taken in segments on the standard three-dimensional digital model according to the sampling period T and the sampling speed v, thereby determining the position of each standard surface point, that is, calibrating the standard surface points on the outer surface of the standard three-dimensional model. S23. Determine the coordinate set of standard surface points based on the position of the standard surface points and the dimensional parameters of the forging; Since the standard 3D model is generated based on the standard dimensions of the forging, the coordinate set of the standard surface points can be accurately calculated by combining the standard dimensions of the forging and the positions of the calibrated standard surface points. It should be noted that since the standard 3D digital model is generated based on the standard dimensional parameters of the forging, all its parameters can be automatically generated from the dimensional parameters of the forging. In addition, the above parameters can also be obtained by actually measuring standard physical samples. The difference is that the measurement by physical samples needs to be calculated by conversion formula. The specific calculation method is exactly the same as the conversion method of the actual surface point coordinate set. S3. Obtain the actual distance parameter set of the forging to be inspected, and calculate the actual surface point coordinate set based on the actual distance parameter set; wherein the actual distance parameter set is based on the standard inspection parameters. The calculation expression for the actual surface point coordinate set is as follows: Where i represents the sampling point number, t represents the sampling time number, and R represents the initial distance between each sampling point. Indicates the actual distance parameter. The polar angle of the sampling point numbered i is represented by the formula: N represents the total number of sampling points; it should be noted that the polar angle of the sampling point numbered 1 is 0°.

[0023] It should be noted that the actual distance parameters are the detection parameters of each infrared distance sensor; refer to Figure 2 As can be seen, since the positions of each infrared distance sensor are fixed, its polar radius is a constant value in polar coordinates, which is the initial distance R of each sampling point. The sum of the polar radius of the actual surface point and the actual distance parameter is the initial distance R, thus obtaining the calculation expression of the actual surface point coordinate set.

[0024] S4. Match the standard surface point coordinate set with the actual surface point coordinate set to generate several comparison calculation groups; S41. Obtain the standard surface point coordinate set and the actual surface point coordinate set; S42. Establish a one-to-one mapping relationship between the standard surface point coordinate set and the actual surface point coordinate set according to the sampling time number and the sampling point number; Since the standard surface point coordinate set and the actual surface point coordinate set are both obtained based on the same standard detection parameters, points with the same sampling time number and sampling point number can be determined as the same point, thereby establishing a one-to-one mapping relationship between the standard surface point coordinate set and the actual surface point coordinate set, and thus associating the standard surface point coordinates and actual surface point coordinates of the same point. S43. Based on the one-to-one mapping relationship, the corresponding standard surface points and the actual surface points are grouped into the same calculation group to generate a comparison calculation group; The coordinates of standard surface points, which are associated through a one-to-one mapping relationship, and the coordinates of actual surface points are grouped into the same calculation group. Since the above data have the same polar angle, the corresponding polar angle is removed to generate the comparison calculation group. ; S5. Perform comparisons on each comparison calculation group according to the standard comparison model and output the detection results; The calculation expression for the standard alignment model is as follows: ,in Representing radial deviation, its expression is: : Represents the polar radius coordinates of a point on the standard surface. Represents the polar radius coordinates of the actual surface point; and These represent the allowable upper and lower deviation values ​​for radial deviation, respectively. The radial deviation of each surface point is calculated according to the formula for radial deviation, and the forming status of each surface point is determined by the standard comparison model mentioned above. Then, the results are statistically analyzed to determine the number of surface points with insufficient material, the number of qualified surface points, and the number of surface points with excess material. Finally, the proportion of surface points with insufficient material, qualified material, and excess material is calculated based on the total number of surface points. The above proportions are then compared with the set standard ratio, and the test results are output based on the comparison results. If the proportion of missing material exceeds the standard value, it can be determined that the forging has a forging defect of missing material. If it also has an excessive proportion exceeding the set standard value, it can also be determined that it has an excessive defect.

[0025] Implementation Method 2 ReferenceFigures 3 to 5 This embodiment, as an optional implementation of this application, discloses a detection device, including a frame 1. The frame 1 is generally arranged in the form of a flat plate structure. Along the length direction of the frame 1, a slide rail 4 is provided on the frame 1, and a base 5 is slidably arranged on the slide rail 4. At the same time, a drive module is also provided on the frame 1. The drive module includes a drive motor 6 and a drive screw 7, wherein the drive screw 7 is threadedly connected to the base 5, and the drive motor 6 and the drive screw 7 are connected through a coupling. Furthermore, a connecting sleeve is provided on the top surface of the base 5, and a connecting rod is provided inside the connecting sleeve. The defect detection device also includes an annular detection frame 2, the bottom of which is connected to the connecting rod. The annular detection frame 2 is a circular ring. Around the axis of the annular detection frame 2, a plurality of mounting holes 9 are provided on it. Each mounting hole 9 penetrates its inner surface and outer surface in the radial direction. The defect detection device also includes a detection module, which includes a plurality of infrared distance sensors 8, each of which is placed in a mounting hole 9, and the infrared rays of each of which converge at the center of the annular detection frame 2. Furthermore, the mounting hole 9 is a T-shaped hole, which can effectively control the installation position of each infrared distance sensor 8, ensure the accuracy of the initial distance R, and thus improve the reliability and accuracy of the detection results.

[0026] Furthermore, the defect detection device also includes a clamping module, which includes a first adjusting rail 10 and a second adjusting rail 11. Along the axial direction of the annular detection frame 2, the first adjusting rail 10 and the second adjusting rail 11 are respectively placed at both ends of the annular detection frame 2. At the same time, clamping seats 12 are provided on both the first adjusting rail 10 and the second adjusting rail 11. A pin 13 is provided on the side of the two clamping seats 12 that faces each other. The two pins 13 are coaxial with the annular detection frame 2. Furthermore, locking screws are provided on the two clamping seats 12, which can fix the two clamping seats 12 to ensure stable clamping and fixing of the forging. Furthermore, the defect detection device also includes a reference point marking module, which includes a slotted photoelectric sensor 14 and a telescopic adjustment rod. The slotted photoelectric sensor 14 is disposed on any clamping seat 12, and the telescopic adjustment rod 15 is disposed on the base 5. A baffle 16 is provided at the free end of the telescopic adjustment rod 15. The position of the baffle 16 is controlled by controlling the length of the telescopic adjustment rod 15, thereby controlling the contact time between the baffle 16 and the slotted photoelectric sensor 14. While the slotted photoelectric sensor 14 is blocked by the baffle 16, each of the infrared distance sensors 8 starts to work and collect data. The above-described structure effectively controls the start time of each infrared distance sensor 8, thereby controlling the starting point of data acquisition and ensuring that the standard surface point coordinate set can be accurately aligned with the actual surface point coordinate set, thus improving the accuracy and reliability of detection.

[0027] It should be noted that the slotted photoelectric sensor 14 can also be mounted on the frame 1. In this case, it is necessary to ensure that the clamping seat 12 is always in a fixed state to ensure the accuracy of positioning. When using the testing device described in this application, the annular testing frame is reset by the driving device, then the distance between the two clamping seats is increased, the forging to be tested is installed between the two clamping seats, and then the distance between the two clamping seats is reduced, thereby ensuring that the two ejector pins are inserted into the ejector pin holes on both ends of the forging, and the two ejector pin holes are coaxial; finally, the forging can be fixed by locking the clamping seats. During the inspection, the ring inspection frame moves from one end to the other along the axis of the forging at a sampling speed v under the control of the drive module. When the baffle contacts the slotted photoelectric sensor, the slotted photoelectric sensor sends a start signal, thereby controlling each infrared distance sensor to start and perform the first inspection. Subsequently, the infrared distance sensor performs continuous sampling according to the sampling period T. The application utilizes a ring-shaped inspection frame to arrange the inspection device around the axis of the forging to be inspected, thereby achieving comprehensive coverage inspection of the entire forging surface. By connecting the various measurement points within the same sampling period in series, the contour curve of a certain cross-section can be obtained. Combined with the axial sliding of the ring-shaped inspection frame under the control of the drive module, relevant parameters from different end faces can be continuously collected. Finally, the positioning of different cross-sections is achieved through sampling time and moving speed, thereby generating a full-size point cloud map of the forging. When a certain area of ​​the forging is short of material, the actual surface point coordinates at the same location shift towards the forging axis relative to the standard surface point coordinates, resulting in a smaller actual surface point coordinates compared to the standard surface point coordinates; conversely, the parameters are larger. If the forging is qualified, the parameter deviation is zero or within the allowable deviation range. By comparing the above parameters, it is possible to quickly determine which areas of the forging have short material and which areas have excessive material, thus quickly identifying the forging status of the entire forging.

[0028] Secondly, this application achieves accurate distance measurement through an infrared distance sensor. At the same time, the point cloud density can be controlled by controlling the sampling period, the number of infrared distance sensors, and the moving speed, thereby realizing the manual adjustment of sampling accuracy to meet different sampling accuracy requirements and improve detection accuracy. Finally, compared with the prior art, the technical solution described in this application can realize the dimensional inspection of forgings. Compared with the fixed-point inspection of some key areas in the prior art, its inspection parameters are more comprehensive. Therefore, it can judge the processing quality of the entire forging, and its inspection results are more accurate and comprehensive. At the same time, since this application realizes non-contact and automated inspection through equipment, it not only has higher inspection efficiency, but also avoids damage to forgings caused by contact inspection.

[0029] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for detecting the dimensions of a forged piece, characterized in that, The method comprises the following steps: Setting a standard comparison model and standard detection parameters; Obtaining a standard surface point coordinate set of a standard forging, wherein the standard surface point coordinate set is calculated based on the standard detection parameters; Obtaining an actual distance parameter set of a forging to be detected, and calculating an actual surface point coordinate set based on the actual distance parameter set, wherein the actual distance parameter set is tested based on the standard detection parameters; Matching the standard surface point coordinate set and the actual surface point coordinate set to generate a plurality of comparison calculation groups; According to the standard comparison model, each comparison calculation group is compared, and a detection result is output.

2. A method for detecting the dimensions of a forged product according to claim 1, characterized in that, The calculation expression of the actual surface point coordinate set is ; wherein i represents the sampling point number, t represents the sampling time number, R represents the initial distance of each sampling point, represents the actual distance parameter, represents the deflection polar angle of the sampling point numbered i, and the calculation formula is N represents the total number of sampling points.

3. The method for detecting the outer dimensions of a forged piece according to claim 1, characterized in that, The standard comparison standard surface point polar radius coordinate calculation expression is wherein represents a radial deviation, and its expression is : represents a polar radius coordinate of a standard surface point, represents a polar radius coordinate of an actual surface point; and respectively represent an allowed upper deviation value and an allowed lower deviation value of the radial deviation; and the standard detection parameters include a sampling period T and a sampling speed v.

4. The method for detecting the outer dimensions of a forged piece according to claim 1, characterized in that, The method for obtaining the standard surface point coordinate set of the standard forging comprises the following steps: Constructing a standard polar coordinate system and a standard three-dimensional numerical model of the standard forging; According to the standard detection parameters, points are taken on the standard three-dimensional numerical model to determine the positions of the standard surface points; According to the positions of the standard surface points and the size parameters of the forging, the standard surface point coordinate set is determined.

5. The method for detecting the outer dimensions of a forged piece according to claim 1, characterized in that, The method for matching the standard surface point coordinate set and the actual surface point coordinate set to generate a plurality of comparison calculation groups comprises the following steps: Obtaining the standard surface point coordinate set and the actual surface point coordinate set; According to the sampling time number and the sampling point position number, a one-to-one mapping relationship is established between the standard surface point coordinate set and the actual surface point coordinate set; According to the one-to-one mapping relationship, the corresponding standard surface points and the actual surface points are collected into the same calculation group to generate a comparison calculation group.

6. The measuring apparatus for the measuring method of the outer dimensions of a forged piece according to any one of claims 1 to 5, characterized in that, A rack (1) is provided; A ring-shaped detection frame (2) is slidingly arranged on the rack (1); a driving module is further arranged on the rack (1) and connected with the ring-shaped detection frame (2) in power; A detection module is arranged on the inner wall of the ring-shaped detection frame (2), and is used to obtain actual distance parameters of a forging to be detected; A clamping module is arranged on the rack (1) and used to fix the forging to be detected; A controller (3) is electrically connected with the driving module and the detection module.

7. The detection device of claim 6, wherein, A slide rail (4) is arranged on the rack (1), a base (5) is slidingly arranged on the slide rail (4), the ring-shaped detection frame (2) is connected with the base (5); the driving module comprises a driving motor (6) and a driving lead screw (7) connected in power, and the driving lead screw (7) is connected with the base (5) in screw thread.

8. The detection device of claim 6, wherein, The detection module comprises a plurality of infrared distance sensors (8), the ring-shaped detection frame (2) is uniformly provided with mounting holes (9), each infrared distance sensor (8) is arranged in each mounting hole (9), and the extension lines of the detection directions of the infrared distance sensors (8) intersect at the center of the ring-shaped detection frame (2).

9. The detection device of claim 6, wherein, The clamping module comprises a first adjusting track (10) and a second adjusting track (11), which are arranged at two ends of the annular detection frame (2) along the axial direction of the annular detection frame (2), and a clamping seat (12) for fixing a forging to be detected is slidably arranged on the first adjusting track (10) and the second adjusting track (11).

10. The detection device of claim 9, wherein, The two clamping seats (12) are coaxially arranged with the annular detection frame (2) and are provided with a thimble (13) on the side facing each other.

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