A method for checking minimum clearance based on dynamic tolerance analysis

Abstract

The present invention relates to the technical field of door interference clearance verification, and specifically to a minimum clearance verification method based on dynamic tolerance analysis, the method comprising the following steps: establishing a basic data model including a vehicle body, a vehicle body end hinge, a vehicle door, a vehicle door end hinge and a virtual positioning fixture; establishing positioning points, assembly points or rotation points on the vehicle body, the vehicle body end hinge, the vehicle door and the vehicle door end hinge that match the connecting parts and the virtual positioning fixture and have tolerances; establishing measurement surfaces on the vehicle door and the vehicle body, and establishing measurement relationships; based on the positioning points, assembly points and rotation points and the basic data model, assembling the vehicle body and the vehicle door, rotating the vehicle door, and obtaining the clearance between the vehicle door and the vehicle body during the rotation process according to the measurement relationship between the measurement surface on the vehicle door and the measurement surface on the vehicle body. The method can solve the problem in the prior art that the output motion trajectory is modeled by a kinematic pair, but the tolerance of each link cannot be input, resulting in the verification result deviating from the actual working condition.

Description

Technical Field

[0001] The invention relates to the technical field of door interference clearance verification, and in particular to a minimum clearance verification method based on dynamic tolerance analysis. Background Art

[0002] Door interference clearance refers to the gap between the outer edge of the door and the inner edge of the door frame during the door closing process, which will affect whether the door can be closed normally. Usually, the main structure of the door and door frame will be designed separately first, and then the interference clearance will be checked to achieve the matching of the door and door frame.

[0003] In the prior art, ADAMS software is used to perform accurate motion simulation on sliding doors. According to the actual kinematic pair relationship between the various components of the sliding door, a rotation pair is added between the rotating components, and a contact pair is added between the fitted components. Then, motion simulation is performed to output the sliding door motion envelope trajectory. The obtained motion envelope trajectory is consistent with the actual running trajectory of the sliding door. The DTS (gap step difference) around the sliding door is checked using the envelope trajectory to obtain a reasonable DTS.

[0004] The motion trajectory output by this solution is modeled through kinematic pairs. Although it is analyzed according to the motion process, it is impossible to input the tolerance of each link, and the verification result deviates from the actual working conditions. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a minimum clearance calibration method based on dynamic tolerance analysis, which can solve the problem that the motion trajectory output in the prior art is modeled by a kinematic pair. Although it is analyzed according to the motion process, the tolerance of each link cannot be input, resulting in the calibration result deviating from the actual working conditions.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0007] The present invention provides a minimum clearance verification method based on dynamic tolerance analysis, which is characterized by comprising the following steps:

[0008] Establish a basic data model including the body, body end hinges, doors, door end hinges and virtual positioning fixtures;

[0009] Establishing positioning points, assembly points or rotation points with tolerances on the vehicle body, vehicle body end hinges, vehicle doors and vehicle door end hinges, which match the connected parts and virtual positioning fixtures;

[0010] Establish measurement surfaces on the door and the body, and establish the measurement relationship between the measurement surface on the door and the measurement surface on the body;

[0011] Based on the positioning points, assembly points, rotation points and basic data models, after the door and hinge transfer the assembly tolerance, the body and door are assembled and the door is rotated. According to the measurement relationship between the measuring surface on the door and the measuring surface on the body, the gap between the door and the body during the rotation process is obtained.

[0012] In some optional solutions, the establishment of the measurement profile on the vehicle door and the vehicle body includes:

[0013] Extract body side profile, door side profile and rotation axis from the basic data model;

[0014] Select the side profile of the door and the rotation axis, and within the door closing angle range, use the axial line of the rotation axis as the center line, rotate and copy the side profile of the door and the rotation axis at a set angle to obtain multiple side profiles of the door at different angles;

[0015] Obtain the minimum gap between the door side profile and the vehicle body side profile at different angles, and the measurement area corresponding to the minimum gap;

[0016] A measurement area corresponding to the smallest gap among all gaps between the door side profile and the vehicle body side profile is determined as a measurement profile.

[0017] In some optional embodiments, the set angle is 1°.

[0018] In some optional solutions, the establishment of positioning points, assembly points or rotation points on the vehicle body, vehicle body end hinge, vehicle door and vehicle door end hinge that match the connecting parts and the virtual positioning fixture and have tolerances includes:

[0019] Establishing an assembly positioning point on the vehicle body end hinge that matches the virtual positioning fixture and has a tolerance, and establishing a first rotation point that matches the door end hinge axis;

[0020] Establishing a first X-direction assembly point on the door end hinge that is assembled with the door and has a tolerance, and establishing a second rotation point that matches the hinge axis at the vehicle body end;

[0021] Establish two Z-direction assembly points on the body that match the door end hinges and body end hinges;

[0022] A second X-axis assembly point with a tolerance is established on the door to be assembled with the door end hinge, and a positioning point with a tolerance is established to match the virtual positioning fixture.

[0023] In some optional solutions, the assembling of the vehicle body and the door based on the positioning points, the assembly points, the rotation points and the basic data model includes:

[0024] Based on the positioning points, assemble the door to the virtual positioning fixture;

[0025] Assembling the door end hinge and the body end hinge to the virtual positioning fixture based on the assembly positioning point;

[0026] The vehicle door is assembled to the vehicle body based on two Z-direction assembly points, and the vehicle body is fixed, and the door end hinge is connected to the vehicle door based on a first X-direction assembly point and a second X-direction assembly point;

[0027] Based on the first rotation point and the second rotation point, the body end hinge and the door end hinge are optionally assembled.

[0028] In some optional solutions, the vehicle door is a tailgate, and the two Z-direction assembly points are determined according to manual Y-direction alignment.

[0029] In some optional solutions, the establishment of a basic data model including a vehicle body, a vehicle body end hinge, a vehicle door, a vehicle door end hinge and a virtual positioning fixture includes:

[0030] Establish a body part model, a body end hinge part model, a door part model and a door end hinge part model, and establish a virtual positioning fixture model;

[0031] Combine the body part model with the body end hinge part model, and combine the door part model with the door end hinge part model;

[0032] The combined body part model and body end hinge part model, door part model and door end hinge part model, and virtual positioning fixture model are hung into the same combined file to obtain a basic data model.

[0033] In some optional solutions, the vehicle door is a tailgate, the body end hinge includes a left body end hinge and a right body end hinge, and the door end hinge includes a left door end hinge and a right door end hinge.

[0034] In some optional solutions, the step of rotating the door and obtaining the gap between the door and the vehicle body during the rotation process according to the measurement relationship between the measurement surface on the door and the measurement surface on the vehicle body includes:

[0035] Set the initial value, end value and number of iterations of the door rotation;

[0036] The door is rotated, and the gap between the measuring surface on the door and the measuring surface on the body is measured to obtain the gap between the door and the body during the rotation process.

[0037] In some optional schemes, after measuring the gap between the measuring surface on the door and the measuring surface on the body and obtaining the gap between the door and the body during rotation, the minimum value of all measured gaps between the measuring surface on the door and the measuring surface on the body is determined as the minimum gap.

[0038] Compared with the prior art, the advantages of the present invention are as follows: first, a basic data model including a vehicle body, a vehicle body end hinge, a vehicle door, a vehicle door end hinge and a virtual positioning fixture is established; then, a positioning point, an assembly point or a rotation point matching the connecting parts and the virtual positioning fixture and having tolerances is established on the vehicle body, the vehicle body end hinge, the vehicle door and the vehicle door end hinge; then, a measuring profile is established on the vehicle door and the vehicle body, and a measuring relationship between the measuring profile on the vehicle door and the measuring profile on the vehicle body is established; finally, based on the positioning point, the assembly point and the rotation point and the basic data model, the vehicle body and the vehicle door are assembled, the vehicle door is rotated, and the gap between the vehicle door and the vehicle body during the rotation process is obtained according to the measuring relationship between the measuring profile on the vehicle door and the measuring profile on the vehicle body. In this scheme, a virtual positioning fixture is used to establish positioning points or assembly points with tolerances on the connecting parts of the vehicle body, the vehicle body end hinge, the vehicle door and the vehicle door end hinge. In the subsequent assembly process, assembly is performed based on the positioning point, the assembly point or the rotation point, and when the vehicle door is rotated, the assembly tolerance is considered in real time when the gap between the vehicle door and the vehicle body is measured. In this way, the detected gap between the door and the body is attached with tolerance, and the test results are meaningful for reference. It can provide valuable basis for subsequent tolerance adjustment and design adjustment. In addition, by establishing measurement surfaces on the door and the body, when rotating the door, it is not necessary to measure the gap between the entire door and the body, which can not only improve the calculation efficiency, but also measure the minimum gap between the door and the body when the door rotates relative to the body, providing accurate and efficient support for subsequent modification or optimization plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 Schematic diagram of the structure of a minimum gap verification method based on dynamic tolerance analysis in an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of establishing assembly positioning points in an embodiment of the present invention;

[0042] Figure 3 It is a schematic diagram of establishing a first rotation point in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0045] Figure 1 FIG. 1 is a schematic diagram of the structure of the minimum gap calibration method based on dynamic tolerance analysis in an embodiment of the present invention. Figure 1 As shown, the present invention provides a minimum clearance verification method based on dynamic tolerance analysis, comprising the following steps:

[0046] S1: Establish a basic data model including the body, body end hinges, doors, door end hinges and virtual positioning fixtures.

[0047] In some optional embodiments, the establishment of the basic data model includes the following steps:

[0048] S11: establishing a body part model, a body end hinge part model, a door part model and a door end hinge part model, and establishing a virtual positioning fixture model;

[0049] S12: combining the body part model and the body end hinge part model, and combining the door part model and the door end hinge part model;

[0050] S13: Hanging the combined vehicle body model and vehicle body end hinge model, the door model and door end hinge model, and the virtual positioning fixture model into the same combined file to obtain a basic data model.

[0051] In this embodiment, taking the vehicle door as a tailgate as an example, the vehicle body end hinge includes a left vehicle body end hinge and a right vehicle body end hinge, and the vehicle door end hinge includes a left door end hinge and a right door end hinge.

[0052] Specifically, a body part model, a body end hinge part model, a door part model and a door end hinge part model are established, and a virtual positioning fixture model is established;

[0053] Convert the body and body exterior (area to be checked) into the same PART file to form a body model named BODY; convert the left body end hinge into a PART file named left hinge down; convert the right body end hinge into a PART file named right hinge down to form a body end hinge model; convert the tailgate and the exterior on the tailgate (area to be checked) into the same PART file named tailgate to form a door model; convert the left door end hinge into a PART file named left hinge up; convert the right door end hinge into a PART file named right hinge up to form a door end hinge model; create a virtual positioning fixture model PART file named JIG to form a virtual positioning fixture model.

[0054] The body part model and the body end hinge part model are combined, as well as the door part model and the door end hinge part model are combined, specifically including:

[0055] Hang the left and right body end hinges and the body into the same PRODUCT, named Product2; hang the left and right door end hinges and the tailgate into the same PRODUCT, named Product3;

[0056] The combined body model and body end hinge model, door model and door end hinge model, and virtual positioning fixture model are hung into the same combined file to obtain the basic data model, which specifically includes:

[0057] Hang the left and right body end hinges and the body into the same PRODUCT to obtain Product2, hang the left and right door end hinges and the tailgate into the same PRODUCT to obtain Product3, and a newly created virtual positioning fixture model PART file named JIG are hung into the same PRODUCT file to complete data processing and obtain the basic data model test.

[0058] In this embodiment, the models of various components are firstly established to prepare for the subsequent assembly.

[0059] S2: Establish positioning points, assembly points or rotation points with tolerances on the body, body end hinges, doors and door end hinges, which match the connected parts and virtual positioning fixtures.

[0060] In some optional embodiments, step S2 includes:

[0061] S21: Establishing an assembly positioning point on the vehicle body end hinge that matches the virtual positioning fixture and has a tolerance, and establishing a first rotation point that matches the door end hinge axis.

[0062] like Figure 2 As shown in the figure, the point move_left_hinge_to_jig is the assembly positioning point, including three Z-axis assembly positioning points, move_left_hinge_to_jig_Z1-Z3, and one Y-axis assembly positioning point, move_left_hinge_to_jig_Y. Figure 3 As shown, the left_hinge_axis shown in the figure is the first rotation point.

[0063] S22: establishing a first X-direction assembly point on the door end hinge that is assembled with the door and has a tolerance, and establishing a second rotation point that matches the hinge axis at the vehicle body end;

[0064] S23: Establish two Z-direction assembly points on the vehicle body that match the door end hinge and the vehicle body end hinge;

[0065] S24: establishing a second X-direction assembly point with a tolerance on the door for assembly with the door end hinge, and establishing a positioning point with a tolerance matching the virtual positioning fixture.

[0066] In some optional embodiments, the vehicle door is a tailgate, and the two Z-axis assembly points are determined according to manual Y-axis alignment.

[0067] In this embodiment, a virtual positioning fixture is used to establish positioning points or assembly points with tolerances on the vehicle body, vehicle body end hinges, vehicle doors, and vehicle door end hinges. In the subsequent assembly process, assembly is performed based on positioning points, assembly points, or rotation points. When the door is turned, the tolerance can be considered in real time when the gap between the door and the vehicle body is measured. Since the minimum gap between the door and the vehicle body generally occurs during the process of the door closing, the assembly tolerance between the door and the vehicle body must be considered in real time during the process of the door closing. In this way, the gap between the door and the vehicle body detected is accompanied by tolerances, and the detection results are of reference significance. It can provide valuable basis for subsequent tolerance adjustment and design scheme adjustment.

[0068] S3: Establish measurement surfaces on the door and the body, and establish a measurement relationship between the measurement surface on the door and the measurement surface on the body.

[0069] In some optional embodiments, establishing measurement profiles on the door and the body includes:

[0070] S31: Extract the body side profile, door side profile and rotation axis from the basic data model.

[0071] S32: Selecting a door side profile and a rotation axis, rotating and copying the door side profile and the rotation axis at a set angle within the door closing angle range with the axial line of the rotation axis as the center line, and obtaining a plurality of door side profiles at different angles.

[0072] S33: Acquire the minimum gap between the door side profile and the vehicle body side profile at different angles, and the measurement area corresponding to the minimum gap.

[0073] S34: Determine a measurement area corresponding to the smallest gap among all gaps between the door side profile and the vehicle body side profile as a measurement profile.

[0074] In some optional embodiments, the set angle is 1°.

[0075] In this embodiment, if the data of the entire door and body are directly simulated, the processing volume of the entire data will be very large, the operation efficiency will be low, and the design efficiency will be affected. In order to improve efficiency in this scheme. It is necessary to select appropriate areas on the door and the body. When the door rotates, only the spacing between the corresponding selected areas on the door and the body is detected. This will reduce the data of the simulation operation, thereby saving operation time and improving operation efficiency. However, the corresponding selected areas on the door and the body also need to be selected appropriately, and the measurement results will have reference value, that is, only when the selected selected areas are appropriate, when the door rotates, only the spacing between the corresponding selected areas on the door and the body is measured, and the minimum spacing between the corresponding selected areas on the door and the body is obtained, it can represent the minimum gap between the door and the body. In addition, in order to further improve the efficiency of the simulation operation, when selecting the corresponding areas on the door and the body, it is necessary to select smaller areas as much as possible to reduce the calculation data and improve the efficiency of the simulation operation.

[0076] In order to improve the calculation speed, this solution will not choose to calculate the door side profile and all the door side profiles. In this solution, the body side profile, door side profile and rotation axis are extracted from the basic data model, the door side profile and rotation axis are selected, and the axial line of the rotation axis is used as the center line within the door closing angle range. The door side profile and rotation axis are rotated and copied at a set angle to obtain multiple door side profiles at different angles, and the gaps between the door side profile and the body side profile at different angles are measured. When measuring, the minimum gap between the door side profile and the body side profile at each angle is selected, and the measurement area of ​​the door side profile and the body side profile corresponding to the minimum gap is found, that is, the measurement position corresponding to the minimum gap between the door side profile and the body side profile on the door side profile and the body side profile, and the measurement area corresponding to the minimum gap between all the gaps between the door side profile and the body side profile at different rotation angles is used as the measurement surface. Through the above method, the measurement area that best represents the risk area can be determined and used as the measurement surface for subsequent tolerance rotation simulation of the entire door. This can not only improve the calculation efficiency, but also measure the minimum gap between the door and the body when the door rotates relative to the body, providing accurate and efficient support for subsequent modification or optimization plans.

[0077] S4: Based on the positioning points, assembly points, rotation points and basic data model, after the door and hinge transfer the assembly tolerance, the body and door are assembled and the door is rotated. According to the measurement relationship between the measuring surface on the door and the measuring surface on the body, the gap between the door and the body during the rotation process is obtained.

[0078] In some optional embodiments, the step of assembling the vehicle body and the vehicle door based on the positioning points, the assembly points, the rotation points and the basic data model includes:

[0079] S41: Based on the positioning points, assemble the vehicle door to the virtual positioning fixture.

[0080] S42: Assembling the door end hinge and the body end hinge to the virtual positioning fixture based on the assembly positioning point.

[0081] S43: Assemble the vehicle door to the vehicle body based on two Z-direction assembly points, and fix the vehicle body; and connect the vehicle door end hinge to the vehicle door based on the first X-direction assembly point and the second X-direction assembly point.

[0082] S44: Based on the first rotation point and the second rotation point, the body end hinge and the door end hinge are optionally assembled.

[0083] The step of rotating the door and obtaining the gap between the door and the vehicle body during the rotation process according to the measurement relationship between the measurement surface on the door and the measurement surface on the vehicle body comprises:

[0084] The initial value, end value and iteration number of the door rotation are set; the door is rotated, and the gap between the measuring surface on the door and the measuring surface on the body is measured to obtain the gap between the door and the body during the rotation process.

[0085] In this embodiment, the initial value and the end value of the door rotation are set, that is, the initial angle of the door rotation and the angle when the door is closed are set. The number of iterations is the angle of each rotation, and the number of iterations is set to 5000 in this example.

[0086] In some optional embodiments, after measuring the gap between the measuring surface on the door and the measuring surface on the body and obtaining the gap between the door and the body during rotation, the minimum value of all gaps between the measuring surface on the door and the measuring surface on the body is determined as the minimum gap.

[0087] In summary, firstly, a basic data model including the body, body end hinge, door, door end hinge and virtual positioning fixture is established; then, positioning points, assembly points or rotation points with tolerances are established on the body, body end hinge, door and door end hinge to match the connected parts and virtual positioning fixture; then, measurement surfaces are established on the door and body, and the measurement relationship between the measurement surface on the door and the measurement surface on the body is established; finally, based on the positioning points, assembly points and rotation points and the basic data model, the body and door are assembled to rotate the door, and the gap between the door and the body during the rotation process is obtained according to the measurement relationship between the measurement surface on the door and the measurement surface on the body. In this scheme, a virtual positioning fixture is used to establish positioning points or assembly points with tolerances on the body, body end hinge, door and door end hinge to connect the parts. In the subsequent assembly process, assembly is performed based on the positioning points, assembly points or rotation points. When the door is rotated, the assembly tolerance is considered in real time when the gap between the door and the body is measured. In this way, the detected gap between the door and the body is attached with tolerance, and the test results are meaningful for reference. It can provide valuable basis for subsequent tolerance adjustment and design adjustment. In addition, by establishing measurement surfaces on the door and the body, when rotating the door, it is not necessary to measure the gap between the entire door and the body, which can not only improve the calculation efficiency, but also measure the minimum gap between the door and the body when the door rotates relative to the body, providing accurate and efficient support for subsequent modification or optimization plans.

[0088] In addition, compared with the existing technology, it is impossible to accurately judge whether the output verification results are acceptable, which affects the size of the DTS seam and the refinement of the whole vehicle; for verification results that do not meet the design specifications, it is impossible to optimize the verification results based on the adjustment of the manufacturing plan. This solution uses 3DCS software to bring the manufacturing process tolerance into the motion verification model, which is more in line with the actual situation. It can also output the normal distribution curve of the tolerance and the contribution factor affecting the distribution, optimize the contribution factor, and output a verification result with tolerance for each motion posture. For the worst verification result, it can output the tolerance contribution of each link, and can optimize the parts with larger tolerance contribution.

[0089] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0090] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0091] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A minimum clearance verification method based on dynamic tolerance analysis, characterized in that: The following steps are involved: Establish a basic data model including the body, body end hinges, doors, door end hinges and virtual positioning fixtures; Establishing positioning points, assembly points or rotation points with tolerances on the vehicle body, vehicle body end hinges, vehicle doors and vehicle door end hinges, which match the connected parts and virtual positioning fixtures; Establish measurement surfaces on the door and the body, and establish the measurement relationship between the measurement surface on the door and the measurement surface on the body; Based on the positioning points, assembly points, rotation points and basic data models, after the door and hinge transfer the assembly tolerance, the body and door are assembled, the door is rotated, and the gap between the door and the body during the rotation process is obtained according to the measurement relationship between the measurement surface on the door and the measurement surface on the body; The step of establishing the measuring profile on the door and the body includes: Extract body side profile, door side profile and rotation axis from the basic data model; Select the side profile of the door and the rotation axis, and within the door closing angle range, use the axial line of the rotation axis as the center line, rotate and copy the side profile of the door and the rotation axis at a set angle to obtain multiple side profiles of the door at different angles; Obtain the minimum gap between the door side profile and the vehicle body side profile at different angles, and the measurement area corresponding to the minimum gap; Determine a measurement area corresponding to the smallest gap among all gaps between the side profile of the door and the side profile of the vehicle body as a measurement profile; The establishment of positioning points, assembly points or rotation points with tolerances on the vehicle body, vehicle body end hinges, vehicle doors and vehicle door end hinges, which match the connecting parts and virtual positioning fixtures thereof, includes: Establishing an assembly positioning point on the vehicle body end hinge that matches the virtual positioning fixture and has a tolerance, and establishing a first rotation point that matches the door end hinge axis; Establishing a first X-direction assembly point on the door end hinge that is assembled with the door and has a tolerance, and establishing a second rotation point that matches the hinge axis at the vehicle body end; Establish two Z-direction mounting points on the vehicle body to match the door end hinges and the vehicle body end hinges; A second X-axis assembly point with a tolerance is established on the door to be assembled with the door end hinge, and a positioning point with a tolerance is established to match the virtual positioning fixture.

2. The minimum gap verification method based on dynamic tolerance analysis according to claim 1, characterized in that: The setting angle is 1°.

3. The minimum clearance verification method based on dynamic tolerance analysis according to claim 1, characterized in that: The method of assembling the vehicle body and the vehicle door after transferring the assembly tolerance of the vehicle door and the hinge based on the positioning point, the assembly point, the rotation point and the basic data model includes: Based on the positioning points, assemble the door to the virtual positioning fixture; Assembling the door end hinge and the body end hinge to the virtual positioning fixture based on the assembly positioning point; The vehicle door is assembled to the vehicle body based on two Z-direction assembly points, and the vehicle body is fixed, and the door end hinge is connected to the vehicle door based on a first X-direction assembly point and a second X-direction assembly point; Based on the first rotation point and the second rotation point, the body end hinge and the door end hinge are optionally assembled.

4. The minimum gap verification method based on dynamic tolerance analysis according to claim 3 is characterized in that: The vehicle door is a tailgate, and the two Z-direction assembly points are determined according to manual adjustment of Y-direction centering.

5. The minimum gap verification method based on dynamic tolerance analysis according to claim 1, characterized in that: The establishment of the basic data model including the vehicle body, vehicle body end hinges, vehicle doors, vehicle door end hinges and virtual positioning fixtures includes: Establish a body part model, a body end hinge part model, a door part model and a door end hinge part model, and establish a virtual positioning fixture model; Combine the body part model with the body end hinge part model, and combine the door part model with the door end hinge part model; The combined body part model and body end hinge part model, door part model and door end hinge part model, and virtual positioning fixture model are hung into the same combined file to obtain a basic data model.

6. The minimum gap verification method based on dynamic tolerance analysis according to claim 5, characterized in that: The vehicle door is a tailgate, the vehicle body end hinge comprises a left vehicle body end hinge and a right vehicle body end hinge, and the vehicle door end hinge comprises a left vehicle door end hinge and a right vehicle door end hinge.

7. The minimum clearance verification method based on dynamic tolerance analysis according to claim 1, characterized in that: The step of rotating the door and obtaining the gap between the door and the vehicle body during the rotation process according to the measurement relationship between the measurement surface on the door and the measurement surface on the vehicle body comprises: Set the initial value, end value and number of iterations of the door rotation; The door is rotated, and the gap between the measuring surface on the door and the measuring surface on the body is measured to obtain the gap between the door and the body during the rotation process.

8. The minimum clearance verification method based on dynamic tolerance analysis according to claim 1, characterized in that: After measuring the gap between the measuring surface on the door and the measuring surface on the body and obtaining the gap between the door and the body during rotation, the minimum value of all the gaps between the measuring surface on the door and the measuring surface on the body is determined as the minimum gap.

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