Stud welding interference detection method and system

Abstract

The invention provides a stud welding interference detection method and system. The stud welding interference detection method comprises the following steps: S1, identifying a part, a clamp, a stud and a guide sleeve under a selected imported product node; s2, a first screening value and a second screening value are determined respectively, and welding guns with the radius of welding gun electrode tips not larger than the first screening value and the length of gun bodies not larger than the second screening value in the welding gun database are called for selection; s3, the welding gun selected in the S2 is used for executing pre-interference detection on all the studs on the part one by one; and S4, performing welding gun simulation rotation interference detection on the stud of which the detection result of the pre-interference detection in the S3 is unqualified for verification. According to the invention, the pre-interference checking is carried out through the pre-interference detection, and the welding gun simulation rotation interference detection is carried out for verification only if the pre-interference detection is unqualified, so that the workload is greatly reduced, and the working efficiency of the interference detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive automated design, and particularly to a method and system for interference detection of stud welding. Background Art

[0002] When designing the stud welding process, it is necessary to perform interference detection on whether the welding gun can reach the welding position smoothly to perform welding operations on the studs. The specific interference detection items include whether the welding gun will collide and interfere with parts, fixtures, and bushings. Among them, the welding gun is a pistol-type welding gun, and the fixture is used to accurately position and reliably clamp the parts to ensure the position accuracy and stability of the parts during welding, so that the studs can be accurately welded to the predetermined positions on the parts; the bushings are fixed on the fixture and correspond to the studs on the parts one by one, and the guide holes of the bushings are used to guide and cooperate with the welding gun electrode heads of the welding gun to ensure the stable posture of the welding gun during welding operations.

[0003] When performing interference inspection on the node design in the welding digital mock-up environment, if it is found that the welding gun interferes with parts, studs on the parts, fixtures, bushings, etc. in the product node, it is necessary to optimize and adjust the fixture structure, welding gun movement path, bushing position, part shape, etc. in the product node until the interference is eliminated. If the above interference detection work is performed and judged manually, it will not only waste a lot of working time and increase costs, but also there may be situations where errors occur due to insufficient personal experience. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method and system for interference detection of stud welding, which is beneficial to reducing the workload and improving the efficiency and accuracy of stud welding interference detection.

[0005] To achieve the above purpose, the present invention provides a method for interference detection of stud welding, which includes: S1. Identify parts, fixtures, studs, and bushings under the selected imported product node; S2. Determine the first screening value and the second screening value respectively, and retrieve welding guns in the welding gun database whose radius of the welding gun electrode head is not greater than the first screening value and the gun body length is not greater than the second screening value for selection; S3. Use the welding gun selected in S2 to perform pre-interference detection on all studs on the parts one by one; S4. Perform welding gun simulation rotation interference detection on the studs with unqualified detection results in the pre-interference detection in S3 for verification.

[0006] Further, the welding gun is a pistol-type welding gun, which includes a gun body and a handle, and the welding gun electrode head is located at the front of the axial direction of the gun body.

[0007] Further, the method for determining the first screening value in S2 is: Perform the first operation on each stud on the part. The first operation includes: taking the center point of the axis of the stud as the center, making an infinite plane perpendicular to the axis of the stud, obtaining the vertical distance of the interference points where other digital models intersect with this infinite plane relative to the axis of the stud, and selecting the minimum value among the vertical distances as the first distance of the stud; After performing the first operation on all the studs on the part, select the minimum value among the first distances corresponding to each stud as the first screening value.

[0008] Furthermore, the method for determining the second screening value in S2 is as follows: Perform the second operation on each stud on the part. The second operation includes: taking the center point of the connection surface between the stud and the part as the starting point, establishing a vector normal perpendicular to the connection surface and with the extending direction consistent with the protruding direction of the stud. When this vector normal intersects with other surfaces of the part, extract the intersecting surfaces multiple times, then extract the intersection points of the vector normal and each extracted surface, measure the distances from the starting point to each intersection point, and take the minimum value L min , and obtain the second distance A corresponding to the stud through Equation 1: A = 120mm - L min -H Equation 1 In Equation 1, A is the second distance corresponding to each stud respectively, and L min is the minimum distance from the starting point to the intersection point corresponding to each stud, and H is the axial length of each stud itself; After performing the second operation on all the studs on the part, select the minimum value among the second distances corresponding to each stud as the second screening value.

[0009] Furthermore, the pre-interference detection includes: S31. Position and assemble the center line of the welding torch electrode head with the center line of the stud; S32. Successively make three detection circular surfaces perpendicular to the axis of the welding torch body and with the center located on the axis of the welding torch body: the first detection circular surface, the second detection circular surface, and the third detection circular surface. S33. Check whether each detection circular surface intersects with other digital models. If none of the detection circular surfaces intersect with other digital models, it is determined that the pre-interference detection result corresponding to the stud is pre-inspection qualified, and this pre-inspection qualification is defined as Class A pre-inspection qualification. If at least one detection circular surface intersects with other digital models, obtain the intersection area on the detection circular surface, and then obtain the non-intersection areas on each detection circular surface to form non-intersection area included angle surfaces with the center of the detection circular surface as the included angle point. Project and superimpose the non-intersection area included angle surfaces of the three detection circular surfaces along the center line direction of the welding torch electrode head, and measure the included angles of each overlapping area after superposition. Select the largest overlapping area included angle among them. If the largest overlapping area included angle is greater than the preset interference detection angle, it is determined that the pre-interference detection result corresponding to the stud is pre-inspection qualified, and this pre-inspection qualification is defined as Class B pre-inspection qualification. If the largest included angle is less than the preset interference detection angle, it is determined that the pre-interference detection result corresponding to the stud is unqualified. S34. Conduct solid interference verification on those with pre-inspection qualified results in S33: Specifically, first construct a verification solid, which is a verification solid generated by lofting with the interference verification sector areas respectively created on the second detection circular surface, the third detection circular surface, and the first detection circular surface in sequence, with the axis of the welding torch body as the guide line. Then check whether the verification solid intersects with other digital models. If there is no intersection, it is determined that the final result of the interference detection corresponding to the stud is qualified. If there is an intersection, it is determined that the pre-interference detection result corresponding to the stud is unqualified. The creation rule of the interference verification sector area is as follows: The center of the interference verification sector area is the center of the corresponding detection circular surface. The included angles of the interference verification sector areas on the three detection circular surfaces are equal and project and face each other for coincidence, and the included angle of the interference verification sector area is equal to the preset interference detection angle. Moreover, if it is Class A pre-inspection qualified, the position of the interference verification sector area on the corresponding detection circular surface is randomly selected. If it is Class B pre-inspection qualified, the interference verification sector area is located within the largest overlapping area described in S33.

[0010] Furthermore, in S32, The first detection circular surface coincides with the point on the handle of the welding torch with the longest perpendicular distance from the axis of the torch body, and the radius of the first detection circular surface is the maximum perpendicular distance between the end of the handle of the welding torch and the axis of the torch body. The center of the second detection circular surface is located at the midpoint of the axis of the welding torch electrode head, and the radius of the second detection circular surface is the radius of the welding torch electrode head. The center of the third detection circular surface is located at the midpoint of the first detection circular surface and the second detection circular surface, and the radius of the third detection circular surface is equal to the median value of the radius of the first detection circular surface and the radius of the second detection circular surface.

[0011] Further, in S4, the welding torch simulation rotation interference detection includes: positioning and assembling the center line of the welding torch electrode head and the center line of the stud, and then rotating the welding torch 360° around the axis of the welding torch electrode head to detect whether there is a non-interference continuous rotation angle greater than the preset interference detection angle during the rotation of the welding torch. If it exists, the interference detection result corresponding to the stud is corrected to be qualified; if not, the interference detection result corresponding to the stud is determined to be unqualified.

[0012] To achieve the above object, the present invention also provides a system for stud welding interference detection, including: An import and recognition module, configured to import and recognize parts, fixtures, studs, and bushings under the product node; A welding torch recommendation module, configured to retrieve a welding torch with the radius of the welding torch electrode head not greater than a first screening value and the length of the torch body not greater than a second screening value from the welding torch database for selection; A pre-interference detection module, configured to perform pre-interference detection on each stud on the part using the selected welding torch one by one; A welding torch simulation rotation interference detection module, configured to perform welding torch simulation rotation interference detection on the studs with unqualified pre-interference detection results for verification.

[0013] To achieve the above object, the present invention also provides an electronic device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements a method for stud welding interference detection as described above.

[0014] To achieve the above object, the present invention also provides a computer storage medium, which stores computer instructions for causing a computer to execute a method for stud welding interference detection as described above.

[0015] Compared with the prior art, the method for stud welding interference detection provided by the present invention performs pre-interference investigation through pre-interference detection, and only performs welding torch simulation rotation interference detection for verification on those with unqualified pre-interference detection, greatly reducing the workload and improving the working efficiency of interference detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flowchart of the method for stud welding interference detection provided by an embodiment of the present invention; Figure 2 Schematic diagram of the main interface of a software embodiment designed for the detection method based on the present invention; Figure 3 Partial design structure diagram of a product node; Figure 4 Schematic diagram of a welding gun; Figure 5 Schematic diagram of three detection circular surfaces; Figure 6 Example diagram of the overlapping area of the included angle surfaces of the non-intersecting areas of three detection circular surfaces; Figure 7 Example diagram for creating a verification entity. Specific implementation manners

[0018] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0019] It should be noted that the terms "include" and "have" and any variations thereof in the present invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] In the prior art, it is necessary for manual labor to search for and confirm the stud positions in the design model of the product node, manually perform the gun insertion operation and the assembly rotation operation for interference detection, and finally export the gun insertion data. Manual processing is prone to errors and wastes a large amount of time cost for processing the massive data of the entire vehicle. If software operation is adopted, the overall speed and efficiency will be greatly increased. By comparing through the set logic, the production of the output can be completed more quickly and efficiently, greatly reducing the requirements for professional technology, and professional engineers can be responsible for more professional work; moreover, through the form of software for design and review, the overall design efficiency is improved and the accuracy is increased.

[0021] As shown in the figure, an embodiment of the present invention provides a method for interference detection of stud welding, which includes the following steps: S1. Identify the parts, fixtures, studs, and bushings under the selected and imported product node; Specifically, as Figure 2 shown, the user opens the product model in CATIA, clicks the "Node Selection" function, and then manually selects the required product node on the product in the CATIA interface. The software will read the product node number and display it in the corresponding input OR display box; among them, multiple selection operations are supported for inputting the product node; After the product node is selected, the import is executed. The studs on the part, the fixture for clamping and fixing the part, and the bushings that correspond to the studs one by one and are fixed on the fixture are imported together with the part. The specific import method belongs to the prior art and will not be elaborated herein. The method of the present invention mainly performs interference detection of stud welding on the above-mentioned design elements of the product node.

[0022] The bushings correspond to the studs on the part one by one and are fixed on the fixture. The guide holes of the bushings are used for guiding and mating with the welding torch electrode head of the welding torch to ensure the stable posture of the welding torch during welding operations. As Figure 3 shown, stud 2a and stud 2b are designed on part 1. Bushing 4a corresponding to stud 2a and bushing 4b corresponding to stud 2b are fixed on fixture 3. The guide hole 40 of each bushing is used for guiding and mating with the welding torch electrode head of the welding torch.

[0023] After the product node is imported, the part, stud, fixture, and bushing therein are respectively identified. For example: The stud identification is mainly to determine the characteristic attribute information of the stud itself, the position information of the stud on the part, etc. The specific identification method belongs to the prior art and will not be elaborated herein.

[0024] S2. Respectively determine the first screening value and the second screening value, and retrieve the welding torches in the welding torch database whose welding torch electrode head radius is not greater than the first screening value and the torch body length is not greater than the second screening value for selection; As Figure 4 shown, the welding torch is a pistol-type welding torch, which includes a torch body 51 and a handle 52. The welding torch electrode head 511 is located at the front part of the axial direction of the torch body 51. In the figure, a is the torch body length and b is the handle length.

[0025] Furthermore, the method for determining the first screening value is: Perform a first operation on each stud on the part one by one. The first operation includes: taking the center point of the axis of the stud as the center, making an infinite plane perpendicular to the axis of the stud, obtaining the vertical distance of the interference point where other digital models intersect with this infinite plane relative to the axis of the stud, and selecting the smallest value among the vertical distances as the first distance of the stud; As Figure 3 shown, taking stud 2a as an example to perform the first operation: taking the center point of the axis of stud 2a as the center, making an infinite plane Y perpendicular to the axis of the stud, obtaining the vertical distance of the interference point where other digital models intersect with this infinite plane relative to the axis of the stud. Regarding the digital model situation around stud 2a, the smallest value among the vertical distances of the interference points where the hole wall of the guide hole 40 of bushing 4a intersects with this infinite plane relative to the axis of the stud is the first distance corresponding to this stud.

[0026] After all the studs on the part have completed the first operation, select the minimum value among the first distances corresponding to each stud as the first screening value.

[0027] The method for determining the second screening value is as follows: Perform the second operation on each stud on the part one by one. The second operation includes: taking the center point of the connection surface between the stud and the part as the starting point, establishing a vector normal perpendicular to the connection surface and with an extension direction consistent (coincident or parallel) with the protruding direction of the stud. When this vector normal intersects with other surfaces of the part, extract the intersecting surfaces multiple times, then extract the intersection points of the vector normal and each extracted surface, measure the distances from the starting point to each intersection point, and take the minimum value L min , and obtain the second distance A corresponding to the stud through Equation 1: A = 120mm - L min -H Equation 1 In Equation 1, A is the second distance corresponding to each stud respectively, L min is the minimum distance from the starting point to the intersection point corresponding to each stud, and H is the axial length of each stud itself; the units of all parameters in Equation 1 are mm. The axial length of the stud can be extracted from the stud database.

[0028] After all the studs on the part have completed the second operation, select the minimum value among the second distances corresponding to each stud as the second screening value.

[0029] S3. Use the welding torch selected in S2 to perform pre-interference detection on each stud on the part one by one. The pre-interference detection includes: S31. Position and assemble the center line of the welding torch electrode head with the center line of the stud; S32. Successively make three detection circular surfaces perpendicular to the axis of the welding torch body 51 and with the center located on the axis of the welding torch body 51: the first detection circular surface B1, the second detection circular surface B2, and the third detection circular surface B3 (as Figure 5 shown), where the first detection circular surface B1 coincides with the point on the welding torch handle 52 that has the longest perpendicular distance from the axis of the torch body 51, and the radius of the first detection circular surface B1 is the maximum perpendicular distance between the end of the welding torch handle 52 and the axis of the torch body 51; The second detection circular surface B2 (combined with Figure 6 shown) has its center located at the midpoint of the axis of the welding torch electrode head 511, and the radius of the second detection circular surface is the radius of the welding torch electrode head 511; it should be noted that due to being blocked by the guide sleeve, Figure 5 the second detection circular surface is not shown in

[0030] The center of the third detection circular surface B3 is located at the midpoint of the first detection circular surface B1 and the second detection circular surface, and the radius of the third detection circular surface B3 is equal to the median value of the radii of the first detection circular surface B1 and the second detection circular surface; S33. Check whether each detection circular surface intersects with other digital models. If none of the detection circular surfaces intersects with other digital models, it is determined that the pre-interference detection result corresponding to the stud is pre-inspection qualified, and this pre-inspection qualified situation is defined as Class A pre-inspection qualification; if at least one detection circular surface intersects with other digital models, obtain the intersection area on the detection circular surface, and then obtain the non-intersection areas on each detection circular surface to form a non-intersection area included angle surface with the center of the detection circular surface as the included angle point. Project and superimpose the non-intersection area included angle surfaces of the three detection circular surfaces along the center line direction of the welding torch electrode head, and measure the included angles of each overlapping area after superposition. Select the largest overlapping area included angle among them. If the largest overlapping area included angle is greater than the preset interference detection angle, it is determined that the pre-interference detection result corresponding to the stud is pre-inspection qualified, and this pre-inspection qualified situation is defined as Class B pre-inspection qualification; if the largest overlapping area included angle is less than the preset interference detection angle, it is determined that the pre-interference detection result corresponding to the stud is unqualified.

[0031] The situation of Class A pre-inspection qualification is relatively simple and will not be elaborated with examples in this article.

[0032] An example of Class B pre-inspection qualification is as Figure 6 shown. The intersection area where the first detection circular surface B1 corresponding to a certain stud intersects with other digital models (parts, jigs or bushings) is obtained as B10, and the intersection area where the third detection circular surface B3 intersects with other digital models is obtained as B21. Then, the non-intersection areas on each detection circular surface can be used to form a non-intersection area included angle surface with the center of the detection circular surface as the included angle point. Project and superimpose the non-intersection area included angle surfaces of the three detection circular surfaces along the center line direction of the welding torch electrode head to obtain two overlapping areas, and measure the included angles of the two overlapping areas as α1 and α2 respectively. Select the largest overlapping area included angle α2 among them. The preset interference detection angle is 20°. Since α2 is greater than 20°, it is determined that the interference detection result corresponding to the stud is pre-inspection qualified and belongs to Class B pre-inspection qualification.

[0033] S34. Conduct entity interference verification for those with pre-interference detection results of pre-inspection qualified in S33: Specifically, first construct a verification entity. The verification entity is a verification entity generated by lofting with the axis of the gun body 51 of the welding torch as the guide line and the interference verification sector areas created on the second detection circular surface B2, the third detection circular surface B3, and the first detection circular surface B1 in sequence; Then check whether the verification entity intersects with other digital models. If there is no intersection, it is determined that the final result of the interference detection corresponding to the stud is qualified; if there is an intersection, it is determined that the pre-interference detection result corresponding to the stud is unqualified; The creation rule of the interference verification fan-shaped area is as follows: The center of the interference verification fan-shaped area is the center of the corresponding detection circular surface. The included angles of the interference verification fan-shaped areas on the three detection circular surfaces are equal and their projections are exactly coincident, and the included angle of the interference verification fan-shaped area is equal to the preset interference detection angle; Moreover, if the pre-inspection of type A is qualified, the position of the interference verification fan-shaped area on the corresponding detection circular surface is randomly selected. If the pre-inspection of type B is qualified, the interference verification fan-shaped area is located within the maximum coincidence area described in S33.

[0034] For example, as Figure 7 shown, taking the axis of the gun body 51 of the welding torch as the guiding line Y1, Q2 shows the interference verification fan-shaped area created on the second detection circular surface B2, Q3 shows the interference verification fan-shaped area created on the third detection circular surface B3, and Q1 shows the interference verification fan-shaped area created on the first detection circular surface B1. The included angles of Q1, Q3, and Q2 are equal and their projections are exactly coincident, and the included angle is equal to the preset interference angle of 20°. For the case where the pre-inspection of type A is qualified, the creation position of the interference verification fan-shaped area can be randomly selected. For the case where the pre-inspection of type B is qualified, the interference verification fan-shaped area should be created within the maximum coincidence area described in S33.

[0035] Taking Y1 as the guiding line, lofting is performed in the order of Q2, Q3, and Q1 to generate a verification solid, and then it is checked whether the verification solid intersects with other digital models. This can not only avoid missing the interference situation where other digital models invade between B1 and B3, and B3 and B2, but also the volume of the verification solid is very small, greatly reducing the computing amount and effectively improving the overall work efficiency. Although the creation position of the interference verification fan-shaped area for the qualified pre-inspection of type A is randomly selected, there is still subsequent S4 to verify the unqualified situation, and there will be no misdetection situation, and at the same time, the verification workload of S4 is also reduced.

[0036] S4. For the studs with unqualified pre-interference detection results in S3, perform welding torch simulation rotation interference detection for verification. The welding torch simulation rotation interference detection belongs to the prior art. It mainly positions and assembles the center line of the welding torch electrode head of the welding torch and the center line of the stud, and then rotates the welding torch 360° around the axis of the welding torch electrode head to detect whether there is a situation where the non-interference continuous rotation angle is greater than the preset interference detection angle during the rotation of the welding torch. If it exists, the corresponding interference detection result of the stud is corrected to be qualified. If it does not exist, the corresponding interference detection result of the stud is determined to be unqualified.

[0037] The collation and output of the interference detection results belong to the prior art and will not be elaborated in this article.

[0038] Since the torch simulation rotation interference detection in S4 requires simulating the interference detection of torch insertion and rotation, it has a large amount of computation and takes a long time. Therefore, the present invention designs a pre-interference detection. Only those that fail the pre-interference detection are subjected to the torch simulation rotation interference detection for verification, which can greatly reduce the workload, improve the overall detection efficiency of the system, and also provide a torch insertion angle solution for the subsequent torch insertion data.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for interference detection of stud welding, characterized in that, Including: S1. Identify parts, jigs, studs, and bushings under the selected imported product nodes; S2. Determine the first screening value and the second screening value respectively, and retrieve welding torches in the welding torch database whose electrode tip radius is not greater than the first screening value and whose torch body length is not greater than the second screening value for selection; S3. Use the welding torch selected in S2 to perform pre-interference detection on each stud on the part one by one; S4. Perform welding torch simulation rotation interference detection on the studs with unqualified pre-interference detection results in S3 for verification.

2. The method for interference detection of stud welding according to claim 1, characterized in that, The welding torch is a pistol-type welding torch, which includes a torch body and a handle, and the welding torch electrode tip is located at the front part of the axial direction of the torch body.

3. A method for interference detection of stud welding according to claim 1, characterized in that, The method for determining the first screening value in S2 is as follows: Perform the first operation on each stud on the part one by one. The first operation includes: taking the center point of the axis of the stud as the center, making an infinite plane perpendicular to the axis of the stud, obtaining the vertical distance of the interference points where other digital models intersect with this infinite plane relative to the axis of the stud, and selecting the minimum value among the vertical distances as the first distance of the stud; After all the studs on the part have completed the first operation, select the minimum value among the first distances corresponding to each stud as the first screening value.

4. A method for interference detection of stud welding according to claim 1, characterized in that, The method for determining the second screening value in S2 is as follows: Perform a second operation on each stud on the part, the second operation including: taking the center point of the connection surface between the stud and the part as the starting point, establishing a vector normal perpendicular to the connection surface and with an extending direction consistent with the protruding direction of the stud, when the vector normal intersects with other surfaces of the part, multiply extract the intersecting surfaces, then extract the intersection points of the vector normal and each extracted surface, measure the distances from the starting point to each intersection point, and take the minimum value L among them min , and obtain the second distance A corresponding to the stud through Equation 1: A = 120mm - L min - Type 1 of H In Formula 1, A is the second distance corresponding to each stud, L min is the minimum distance from the starting point to the intersection point corresponding to each stud, and H is the axial length of each stud itself; After all the studs on the part have completed the second operation, select the minimum value among the second distances corresponding to each stud as the second screening value.

5. A method for interference detection of stud welding according to claim 1, characterized in that, The pre-interference detection includes: S31. Position and assemble the center line of the welding torch electrode tip and the center line of the stud; S32. Successively make three detection circular surfaces perpendicular to the axis of the welding torch body and with the center of the circle located on the axis of the welding torch body: the first detection circular surface, the second detection circular surface, and the third detection circular surface; S33. Check whether each detection circular surface intersects with other digital models. If none of the detection circular surfaces intersects with other digital models, it is determined that the pre-interference detection result corresponding to the stud is pre-inspection qualified, and this pre-inspection qualified is defined as Class A pre-inspection qualified; if at least one detection circular surface intersects with other digital models, obtain the intersection area on the detection circular surface, and then obtain the non-intersection area on each detection circular surface to form a non-intersection area included angle surface with the center of the detection circular surface as the included angle point. Project and stack the non-intersection area included angle surfaces of the three detection circular surfaces along the center line direction of the welding torch electrode tip, and measure the included angle of each overlapping area after stacking. Select the maximum overlapping area included angle among them. If the maximum overlapping area included angle is greater than the preset interference detection angle, it is determined that the pre-interference detection result corresponding to the stud is pre-inspection qualified, and this pre-inspection qualified situation is defined as Class B pre-inspection qualified; if the maximum overlapping area included angle is less than the preset interference detection angle, it is determined that the pre-interference detection result corresponding to the stud is unqualified; S34. Perform solid interference verification on the pre-interference detection results in S33 that are pre-inspection qualified: Specifically, first construct a verification solid. The verification solid is a verification solid generated by lofting with interference verification fan-shaped areas created on the second detection circular surface, the third detection circular surface, and the first detection circular surface in sequence with the axis of the welding torch body as the guiding line. Then, check whether the verification entity intersects with other digital models. If there is no intersection, it is determined that the final result of the interference detection corresponding to the stud is qualified; if there is an intersection, it is determined that the pre-interference detection result corresponding to the stud is unqualified. The creation rule of the interference verification sector area is as follows: The center of the interference verification sector area is the center of the corresponding inspection circular surface. The angles of the interference verification sector areas on the three inspection circular surfaces are equal and their projections are exactly coincident, and the angle of the interference verification sector area is equal to the preset interference detection angle. Moreover, if the pre-inspection of type A is qualified, the position of the interference verification sector area on the corresponding inspection circular surface is randomly selected; if the pre-inspection of type B is qualified, the interference verification sector area is located within the maximum coincidence area described in S33.

6. A method for interference detection of stud welding according to claim 5, characterized in that, In S32, The first inspection circular surface coincides with the point on the handle of the welding torch that has the longest perpendicular distance from the axis of the gun body, and the radius of the first inspection circular surface is the maximum perpendicular distance between the end of the handle of the welding torch and the axis of the gun body. The center of the second inspection circular surface is located at the midpoint of the axis of the electrode head of the welding torch, and the radius of the second inspection circular surface is the radius of the electrode head of the welding torch. The center of the third inspection circular surface is located at the midpoint between the first inspection circular surface and the second inspection circular surface, and the radius of the third inspection circular surface is equal to the median of the radius of the first inspection circular surface and the radius of the second inspection circular surface.

7. The method for stud welding interference detection according to claim 1, characterized in that, In S4, the welding torch simulation rotation interference detection includes: positioning and assembling the center line of the electrode head of the welding torch with the center line of the stud, and then rotating the welding torch 360° around the axis of the electrode head of the welding torch to detect whether there is a non-interference continuous rotation angle greater than the preset interference detection angle during the rotation of the welding torch: if there is, correct the interference detection result corresponding to the stud to be qualified; if not, determine that the interference detection result corresponding to the stud is unqualified.

8. A system for interference detection in stud welding, characterized in that, It includes: An import and recognition module, which is used to import and recognize parts, fixtures, studs, and bushings under the product node. A welding torch recommendation module, which is used to retrieve welding torches in the welding torch database with the radius of the electrode head of the welding torch not greater than the first screening value and the length of the gun body not greater than the second screening value for selection. A pre-interference detection module, which is used to perform pre-interference detection on each stud on the part using the selected welding torch one by one. A welding torch simulation rotation interference detection module, which is used to perform welding torch simulation rotation interference detection on the studs with unqualified pre-interference detection results for verification.

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