Split type vehicle door and pre-bending compensation method thereof

Abstract

The invention relates to the technical field of vehicle door design, in particular to a split type vehicle door and a pre-bending compensation method thereof. The pre-bending compensation method comprises the steps that the vehicle door is divided into a large deformation area and a small deformation area according to a deformation prediction result; the small deformation area of the vehicle door is compensated and adjusted through the clamp; driving the large deformation area of the vehicle door to perform digital-analog rotation according to a preset calculation angle by taking a vehicle door window frame water tangent line as a rotating shaft; and the condition of the welding binding face of the large deformation area of the vehicle door is monitored, and the binding face mathematical model of the large deformation area of the vehicle door is reconstructed according to the monitoring result, so that the welding binding face of the large deformation area of the vehicle door is restored to the initial binding state. For a vehicle door area with large deformation, a process digital model is obtained by adopting a method that a product digital model rotates around a specific shaft by a specific angle. The large workload of CAE analysis and door frame digital-analog complete reconstruction is avoided, and therefore the problems that the digital-analog reconstruction period is long and precision is poor are solved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle door design, and in particular to a split vehicle door and a pre-bending compensation method thereof. Background Art

[0002] The automobile opening parts assembly includes the door assembly, the trunk lid assembly (or the back door assembly), and the hood assembly. They are relatively independent assembly parts in the whole vehicle. The door assembly is connected to the side panels through hinges, limiters and locks, and has clearance and surface difference requirements with the body side panels and fenders and other surrounding parts. In order to ensure the sealing requirements of rainproof, dustproof, sound insulation and noise reduction, one or two sealing strips are arranged between the door assembly and the body to form a sealed space, but the compression of the sealing strip will give the door a reaction force, which will cause the door sheet metal to deform.

[0003] In order to eliminate the influence of such deformation on the sealing performance, closing force and gap surface difference of the car door, the related technologies often adopt the method of fixture adjustment or pre-deformation for adjustment. In the first method: in the industrialization stage, the door frame part of the car door is forced to be corrected by adjusting the support surface of the fixture, and the relative distance between the door nut plate and the car door in the Y and Z directions is compensated by adjusting the fixture. The pre-deformation method requires reverse pre-deformation during sheet metal design based on CAE analysis, thereby alleviating the sheet metal deformation of the car door.

[0004] However, the fixture adjustment method can only be used for fine-tuning of the smaller deformation part, and it is difficult to apply it to large deformation adjustment. The pre-deformation method based on CAE analysis requires the establishment of a door model, the selection of grid units, and the application of uniformly distributed loads to obtain the deformation of the window frame. Based on this deformation, the door sheet metal process data is pre-bent and deformed. However, due to the limitations of structural characteristics, the area of ​​a single grid at the door window frame and the lower part of the door are quite different. Therefore, the uniformly distributed load is applied according to the grid area, resulting in low accuracy of the pre-bending analysis results of the opening and closing parts of the door in the prior art. In addition, the digital model is reconstructed, which is equivalent to reconstructing the digital model based on the deformation of each part of the door calculated by CAE. The workload is relatively large and the cycle is relatively long. Summary of the invention

[0005] In view of the related technology, in the pre-bending deformation processing of the door sheet metal process data, the deformation difference of various parts of the door is large. The pre-deformation method based on CAE analysis is used to pre-bend the opening and closing parts of the door, but the accuracy of the analysis result is low and the workload is large.

[0006] In a first aspect, an embodiment of the present application provides a pre-bending compensation method for a split vehicle door, the pre-bending compensation method comprising:

[0007] According to the deformation prediction result, the door is divided into a large deformation area and a small deformation area;

[0008] Compensation adjustment of small deformation areas of the door is carried out by means of a fixture;

[0009] Drive the large deformation area of ​​the door to perform digital model rotation according to the preset calculation angle with the door window frame water tangent line as the rotation axis;

[0010] The condition of the welding fitting surface in the large deformation area of ​​the car door is monitored, and the digital model of the fitting surface in the large deformation area of ​​the car door is reconstructed according to the monitoring results, so that the welding fitting surface in the large deformation area of ​​the car door is restored to the initial fitting state.

[0011] In combination with the first aspect, in one implementation, dividing the vehicle door into a large deformation area and a small deformation area according to the magnitude of the deformation includes:

[0012] The door frame assembly of the vehicle door is divided into a large deformation area, the door frame assembly includes a door frame part and a door frame connecting plate, and the door frame connecting plate is connected to both ends of the door frame part;

[0013] The door panel assembly of the vehicle door is divided into small deformation areas, and the door panel assembly includes a door inner panel, an inner panel reinforcement plate and a door outer panel.

[0014] In combination with the first aspect, in one implementation, the method of driving the large deformation area of ​​the door to perform digital-analog rotation according to a preset calculation angle with the door window frame water tangent line as the rotation axis includes:

[0015] Calculate the preset rotation angle based on the size of the door frame assembly;

[0016] The line connecting the two ends of the door frame connecting plate is used as the rotation axis to drive the door frame to rotate at a preset rotation angle.

[0017] In combination with the first aspect, in one implementation, calculating the preset rotation angle according to the size of the door frame assembly includes:

[0018] Take the first highest point of the door frame in the Z direction of the vehicle, and draw a perpendicular line from the first highest point to the rotation axis, which intersects the rotation axis at the zero boundary point;

[0019] Determine the second highest point of the door frame portion in the Z direction of the vehicle after the door frame portion is rotated according to the position of the door frame portion after the door frame portion is rotated;

[0020] The preset rotation angle of the door frame portion is calculated according to the positions of the first highest point and the second highest point of the door frame portion in the Z direction of the vehicle before and after the door frame portion is rotated.

[0021] In combination with the first aspect, in one implementation, the calculating the door frame rotation angle according to the highest points H1 and H1' in the vehicle Z direction before and after the door frame rotates includes:

[0022] Set the distance T between the first highest point and the second highest point, and calculate the preset rotation angle θ of the door frame according to the formula:

[0023] θ=arccos((D1 2 +D1 2 -T 2 ) / 2*D1*D1)

[0024] Wherein, D1 is the distance from the first highest point to the zero boundary point, and T is the distance between the first highest point and the second highest point.

[0025] In combination with the first aspect, in one implementation, setting the distance T between the first highest point and the second highest point includes:

[0026] The distance T between the first highest point and the second highest point was set to 1.5 mm.

[0027] In combination with the first aspect, in one implementation, monitoring the condition of the welding joint surface in the large deformation area of ​​the door includes:

[0028] After rotation, the fitting status of all fitting surfaces between the door frame, the door frame connecting plate and the door inner panel is tested.

[0029] In combination with the first aspect, in one implementation, reconstructing the digital model of the fitting surface of the large deformation area of ​​the door according to the monitoring result includes:

[0030] When the monitoring result shows that only the door frame and the door frame connecting plate are in a fitted state after rotation, and other fitting surfaces are not in a fitted state, the fitting surface of the door frame connecting plate is digitally reconstructed;

[0031] When the monitoring results show that the three-layer bonding surfaces of the rear door frame, the door frame connecting plate and the door inner panel are bonded together, the bonding surfaces of the door frame are digitally reconstructed.

[0032] In combination with the first aspect, in one implementation, compensating and adjusting the small deformation area of ​​the door by using a clamp includes: using a clamp to compensate and adjust the deformation of the door inner panel, the inner panel reinforcement plate and the door outer panel.

[0033] In a second aspect, an embodiment of the present application provides a split vehicle door, which is manufactured after deformation compensation processing is performed using any of the pre-bending compensation methods described above.

[0034] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0035] This application divides the vehicle door into large and small deformation areas, and then uses different pre-bending compensation methods to pre-bend the two areas. Furthermore, for the door area with larger deformation, this application adopts the method of rotating the product digital model around a specific axis at a specific angle to obtain the process digital model (digital model of industrial molds, inspection fixtures, and fixtures), and matches the welding overlap area of ​​the door frame and the door frame connecting plate in the door frame assembly, and changes the digital model locally and slightly. The large workload of CAE analysis and complete reconstruction of the door frame digital model is avoided, thereby solving the problem of long reconstruction cycle and poor accuracy of the digital model. The frequency and amplitude of subsequent industrial adjustments to the fixture are significantly reduced, ensuring the requirements of the clearance surface difference, sealing, and opening and closing force of the vehicle door, and ensuring quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a front view of a split door in an embodiment of the present application;

[0037] Figure 2 This is a front view of the door frame assembly in the embodiment of the present application;

[0038] Figure 3 A side view of a split door in an embodiment of the present application;

[0039] Figure 4 It is a partial schematic diagram of the door inner panel in the embodiment of the present application;

[0040] Figure 5 A partial cross-sectional view of a split vehicle door in an embodiment of the present application;

[0041] Figure 6 It is a schematic diagram of the split vehicle door before and after the door frame part rotates in the embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of the principle of the split door before and after the door frame part rotates in the embodiment of the present application;

[0043] Figure 8 It is a partial cross-sectional view of the door frame after rotation in the embodiment of the present application;

[0044] Fig. 9 It is a partial cross-sectional view of the second situation after the door frame part is rotated in the embodiment of the present application.

[0045] Description of the drawings: 1. Door frame assembly; 11. Door frame part; 111. First side door frame; 112. Second side door frame; 12. Door frame connecting plate; 121. Door frame front connecting plate; 122. Door frame middle connecting plate; 123. Door frame rear connecting plate; 2. Door inner panel; 3. Inner panel reinforcement plate; 4. Door outer panel; 5. Hinge nut plate assembly; 6. Vehicle body. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solution of the present application, 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 only 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 creative work are within the scope of protection of this application.

[0047] In view of the related technology, in the pre-bending deformation processing of the door sheet metal process data, the deformation difference of various parts of the door is large. The pre-deformation method based on CAE analysis is used to pre-bend the opening and closing parts of the door, but the accuracy of the analysis result is low and the workload is large.

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0049] In a first aspect, an embodiment of the present application provides a pre-bending compensation method for a split vehicle door, the pre-bending compensation method comprising:

[0050] Step S1: Divide the vehicle door into a large deformation area and a small deformation area according to the deformation prediction result.

[0051] In the first optional implementation provided by the present application, the vehicle door is divided into three regions according to the magnitude of deformation: a large deformation region Y1, a very small deformation region Y2, and a micro deformation region Y3. Figure 1 As shown, the area above the door projected along the vehicle Y direction by the straight line L1 is the deformation area Y1, where the front and rear end points of the door frame connecting plate 12 of the door frame assembly 1 are point M and point N respectively. Figure 2 As shown, L1 is a straight line passing through points M and N, i.e., the window frame water tangent line. The door frame connecting plate 12 comprises: a door frame front connecting plate 121, a door frame middle connecting plate 122, and a door frame rear connecting plate 123, which are welded together with the vehicle door inner plate 2 of the door panel assembly; the area between the straight line L1 and the straight line AC projected onto the vehicle door along the Y direction is the micro-deformation area Y3; the area between the straight line AC and the straight line BC projected onto the vehicle door along the Y direction is the extremely small deformation area Y2, which is simply a triangular area surrounded by the upper and lower hinges and the lock; the area below the vehicle door projected along the Y direction by the straight line BC is the micro-deformation area Y3.

[0052] It should be noted that if Figure 3 As shown, point A is the center of the upper screw hole of the upper hinge on the door inner panel 2, point B is the center of the lower screw hole of the lower hinge on the door inner panel 2, and points P1 and P2 are points on the trimming line of the lock hole on the door inner panel 2 (see Figure 4 ), point C is the center point of line segment P1P2.

[0053] In the second optional implementation provided by the present application, the door frame assembly 1 of the vehicle door is divided into a large deformation area, and the door frame assembly 1 includes a door frame portion 11 and a door frame connecting plate 12, and the door frame connecting plate 12 is connected to both ends of the door frame portion 11; the door panel assembly of the vehicle door is divided into a small deformation area, and the door panel assembly includes a vehicle door inner panel 2, an inner panel reinforcement plate 3 and a vehicle door outer panel 4.

[0054] Furthermore, the door panel assembly area includes two micro-deformation areas Y3 and one extremely small deformation area Y2. The door inner panel 2 area has a certain cross-sectional area after the door outer panel and the inner panel are hemmed, and the door as a whole has a certain strength. As for the door frame assembly 1, the door frame assembly 1 is the deformation area Y1. The part has a small cross-sectional area and is less strong than the door inner panel 2 area.

[0055] It should be noted that the deformation of the door frame assembly 1 is relatively large, and the deformation of the top point of the door frame assembly 1 (the side where the lock point C is located) is about 1.5 mm, and the deformation increases linearly from point C upward. The door frame connecting plate 12 includes: a door frame front connecting plate 121, a door frame middle connecting plate 122, and a door frame rear connecting plate 123. The above line L1 is the line connecting the two end points of the door frame connecting plate 122. The deformation compensation of the door frame assembly 1 is achieved by rotating the door frame digital model by a certain angle, and the data reconstruction method is not used for compensation.

[0056] Step S2: compensating and adjusting the small deformation area of ​​the door by using a fixture.

[0057] In some implementations, a clamp is used to compensate and adjust the deformation of the door inner panel 2 , the inner panel reinforcement plate 3 , and the door outer panel 4 .

[0058] It should be noted that the deformation of the door panel area is small (usually less than 0.5mm) and the difference in deformation between the upper and lower parts is small (less than 0.3mm). The deformation compensation can be achieved by adjusting the fixture instead of using the data reconstruction method.

[0059] Specifically, Figure 5 As shown, first, the door inner panel 2 and the door inner panel reinforcement plate 3 are welded together to form a subassembly, and then the subassembly is welded together with the hinge nut plate assembly 5 (with nuts welded thereon). Finally, the door outer panel 4 and the door inner panel 2 are hemmed by a hemming process. The relative position of the hinge nut plate assembly 5 and the inner panel reinforcement plate 3 is adjusted by fixture adjustment, thereby changing the position of the door outer panel 4 to the vehicle body 6, that is, compensating the compensation amount of the door panel area.

[0060] Step S3, driving the large deformation area of ​​the door to perform digital-analog rotation according to a preset calculation angle with the door window frame water tangent line as the rotation axis.

[0061] The above step S3 includes:

[0062] Step S3a, calculating a preset rotation angle according to the size of the door frame assembly 1.

[0063] Specifically, Figure 6 As shown, take the first highest point H1 of the door frame part 11 in the Z direction of the vehicle, draw a perpendicular line through the first highest point H1 to the rotation axis L1, and intersect the rotation axis L1 at the zero boundary point 0; determine the second highest point H1' which is the highest in the Z direction of the vehicle after the door frame part 11 is rotated according to the position of the door frame part 11 after rotation; calculate the preset rotation angle of the door frame part 11 according to the positions of the first highest point H1 and the second highest point H1' which are the highest in the Z direction of the vehicle before and after the rotation of the door frame part 11.

[0064] Furthermore, if Figure 6 and Figure 7 As shown, the door frame 11 rotates a certain angle toward the interior of the vehicle with the rotation axis L1 as the rotation axis to reach the point H1', ​​so that the distance from the point H1 to the point H1' is T, which is generally taken as T = 1.5 mm. According to the cosine theorem:

[0065] T 2 =D1 2 +D1 2 -2*D1*D1*cosθ

[0066] The distance T between the first highest point and the second highest point is set, and the preset rotation angle θ of the door frame portion 11 is calculated according to the above formula:

[0067] θ=arccos((D1 2 +D1 2 -T 2 ) / 2*D1*D1)

[0068] Wherein, D1 is the distance from the first highest point to the zero boundary point 0, and T is the distance between the first highest point H1 and the second highest point H1'. Preferably, the distance T between the first highest point and the second highest point is set to 1.5 mm.

[0069] Step S3b: Using the line connecting the two ends of the door frame connecting plate 12 as the rotation axis, drive the door frame portion 11 to rotate at a preset rotation angle.

[0070] It can be understood that the deformation compensation is achieved by rotating the door frame digital model by a certain angle, and the data reconstruction method is not used for compensation.

[0071] Step S4, monitoring the condition of the welding bonding surface in the large deformation area of ​​the vehicle door, and reconstructing the digital model of the bonding surface in the large deformation area of ​​the vehicle door according to the monitoring result, so that the welding bonding surface in the large deformation area of ​​the vehicle door is restored to the initial bonding state.

[0072] The above step S4 comprises:

[0073] Step S4a, after the rotation, the fitting states of all fitting surfaces between the door frame portion 11, the door frame connecting plate 12, and the vehicle door inner panel 2 are detected.

[0074] It should be noted that the front door frame connecting plate 121 and the rear door frame connecting plate 123 of the door frame assembly 1 have several welded joint surfaces with the first side door frame 111 and the second side door frame 112 of the door frame portion 11 before the compensatory rotation. After the compensatory rotation toward the inside of the vehicle, the welded joint surfaces have gaps (or interference) and are not in joint, and it is necessary to reconstruct the joint surface digital model to make them fit again (see Figure 4 ).

[0075] Step S4b, reconstructing the digital model of the fitting surface in the large deformation area of ​​the vehicle door according to the monitoring result, so that the welding fitting surface in the large deformation area of ​​the vehicle door is restored to the initial fitting state.

[0076] Specifically, due to the different conditions of the fitting surface, it is necessary to formulate a digital model reconstruction strategy based on the change state of the original fitting surface after rotation. The specific steps include:

[0077] Case 1: When the monitoring result shows that only the door frame portion 11 and the door frame connecting plate 12 are partially in contact with each other after rotation, and other contact surfaces are not in contact with each other, the contact surface of the door frame connecting plate 12 is digitally reconstructed;

[0078] Specifically, Figure 8 As shown in the figure, the dotted line frame part is the fitting surface area. When only the first side door frame 111 is fitted with the door frame rear connecting plate 123, the digital model of the fitting surface of the door frame rear connecting plate 123 is reconstructed.

[0079] Case 2: When the monitoring result shows that the three-layer bonding surfaces of the rear door frame portion 11, the door frame connecting plate 12 and the vehicle door inner panel 2 are bonded together, the bonding surface of the door frame portion 11 is digitally reconstructed.

[0080] Specifically, Fig. 9 As shown in the figure, the dotted line frame part is the bonding surface area, when the three layers of the door inner panel 2, the door frame front connecting plate 121, and the second side door frame 112 are welded and bonded together. In this case, the digital model of the door inner panel 2 cannot be changed, and the door frame front connecting plate 121 must be bonded with the door inner panel 2, so its digital model cannot be changed either. Only the digital model of the door frame welded on the outside can be changed to re-match with the connecting plate, so as to reconstruct the digital model of the second side door frame 112.

[0081] In a second aspect, the present application provides a method for preparing a split vehicle door, wherein the preparation steps include: a method for pre-bending compensation of a split vehicle door, the method comprising:

[0082] Step S1: Divide the vehicle door into a large deformation area and a small deformation area according to the deformation prediction result.

[0083] In the first optional implementation provided by the present application, the vehicle door is divided into three regions according to the magnitude of deformation: a large deformation region Y1, a very small deformation region Y2, and a micro deformation region Y3. Figure 1 As shown, the area above the door projected along the vehicle Y direction by the straight line L1 is the deformation area Y1, where the front and rear end points of the door frame connecting plate 12 of the door frame assembly 1 are point M and point N respectively. Figure 2 As shown, L1 is a straight line passing through points M and N, i.e., the window frame water tangent line. The door frame connecting plate 12 comprises: a door frame front connecting plate 121, a door frame middle connecting plate 122, and a door frame rear connecting plate 123, which are welded together with the vehicle door inner plate 2 of the door panel assembly; the area between the straight line L1 and the straight line AC projected onto the vehicle door along the Y direction is the micro-deformation area Y3; the area between the straight line AC and the straight line BC projected onto the vehicle door along the Y direction is the extremely small deformation area Y2, which is simply a triangular area surrounded by the upper and lower hinges and the lock; the area below the vehicle door projected along the Y direction by the straight line BC is the micro-deformation area Y3.

[0084] It should be noted that if Figure 3 As shown, point A is the center of the upper screw hole of the upper hinge on the door inner panel 2, point B is the center of the lower screw hole of the lower hinge on the door inner panel 2, and points P1 and P2 are points on the trimming line of the lock hole on the door inner panel 2 (see Figure 4 ), point C is the center point of line segment P1P2.

[0085] In the second optional implementation provided by the present application, the door frame assembly 1 of the vehicle door is divided into a large deformation area, and the door frame assembly 1 includes a door frame portion 11 and a door frame connecting plate 12, and the door frame connecting plate 12 is connected to both ends of the door frame portion 11; the door panel assembly of the vehicle door is divided into a small deformation area, and the door panel assembly includes a vehicle door inner panel 2, an inner panel reinforcement plate 3 and a vehicle door outer panel 4.

[0086] Furthermore, the door panel assembly area includes two micro-deformation areas Y3 and one extremely small deformation area Y2. The door inner panel 2 area has a certain cross-sectional area after the door outer panel and the inner panel are hemmed, and the door as a whole has a certain strength. As for the door frame assembly 1, the door frame assembly 1 is the deformation area Y1. The part has a small cross-sectional area and is less strong than the door inner panel 2 area.

[0087] It should be noted that the deformation of the door frame assembly 1 is relatively large, and the deformation of the top point of the door frame assembly 1 (the side where the lock point C is located) is about 1.5 mm, and the deformation increases linearly from point C upward. The door frame connecting plate 12 includes: a door frame front connecting plate 121, a door frame middle connecting plate 122, and a door frame rear connecting plate 123. The above line L1 is the line connecting the two end points of the door frame connecting plate 122. The deformation compensation of the door frame assembly 1 is achieved by rotating the door frame digital model by a certain angle, and the data reconstruction method is not used for compensation.

[0088] Step S2: compensating and adjusting the small deformation area of ​​the door by using a fixture.

[0089] In some implementations, a clamp is used to compensate and adjust the deformation of the door inner panel 2 , the inner panel reinforcement plate 3 , and the door outer panel 4 .

[0090] It should be noted that the deformation of the door panel area is small (usually less than 0.5mm) and the difference in deformation between the upper and lower parts is small (less than 0.3mm). The deformation compensation can be achieved by adjusting the fixture instead of using the data reconstruction method.

[0091] Specifically, Figure 5 As shown, first, the door inner panel 2 and the door inner panel reinforcement plate 3 are welded together to form a subassembly, and then the subassembly is welded together with the hinge nut plate assembly 5 (with nuts welded thereon). Finally, the door outer panel 4 and the door inner panel 2 are hemmed by a hemming process. The relative position of the hinge nut plate assembly 5 and the inner panel reinforcement plate 3 is adjusted by fixture adjustment, thereby changing the position of the door outer panel 4 to the vehicle body 6, that is, compensating the compensation amount of the door panel area.

[0092] Step S3, driving the large deformation area of ​​the door to perform digital-analog rotation according to a preset calculation angle with the door window frame water tangent line as the rotation axis.

[0093] The above step S3 includes:

[0094] Step S3a, calculating a preset rotation angle according to the size of the door frame assembly 1.

[0095] Specifically, Figure 6 As shown, take the first highest point H1 of the door frame part 11 in the Z direction of the vehicle, draw a perpendicular line through the first highest point H1 to the rotation axis L1, and intersect the rotation axis L1 at the zero boundary point 0; determine the second highest point H1' which is the highest in the Z direction of the vehicle after the door frame part 11 is rotated according to the position of the door frame part 11 after rotation; calculate the preset rotation angle of the door frame part 11 according to the positions of the first highest point H1 and the second highest point H1' which are the highest in the Z direction of the vehicle before and after the rotation of the door frame part 11.

[0096] Furthermore, if Figure 6 and Figure 7 As shown, the door frame 11 rotates a certain angle toward the interior of the vehicle with the rotation axis L1 as the rotation axis to reach the point H1', ​​so that the distance from the point H1 to the point H1' is T, which is generally taken as T = 1.5 mm. According to the cosine theorem:

[0097] T 2 =D1 2 +D1 2 -2*D1*D1*cosθ

[0098] The distance T between the first highest point and the second highest point is set, and the preset rotation angle θ of the door frame portion 11 is calculated according to the above formula:

[0099] θ=arccos((D1 2 +D1 2 -T 2 ) / 2*D1*D1)

[0100] Wherein, D1 is the distance from the first highest point to the zero boundary point 0, and T is the distance between the first highest point H1 and the second highest point H1'. Preferably, the distance T between the first highest point and the second highest point is set to 1.5 mm.

[0101] Step S3b: Using the line connecting the two ends of the door frame connecting plate 12 as the rotation axis, drive the door frame portion 11 to rotate at a preset rotation angle.

[0102] It can be understood that the deformation compensation is achieved by rotating the door frame digital model by a certain angle, and the data reconstruction method is not used for compensation.

[0103] Step S4, monitoring the condition of the welding bonding surface in the large deformation area of ​​the vehicle door, and reconstructing the digital model of the bonding surface in the large deformation area of ​​the vehicle door according to the monitoring result, so that the welding bonding surface in the large deformation area of ​​the vehicle door is restored to the initial bonding state.

[0104] The above step S4 comprises:

[0105] Step S4a, after the rotation, the fitting states of all fitting surfaces between the door frame portion 11, the door frame connecting plate 12, and the vehicle door inner panel 2 are detected.

[0106] It should be noted that the front door frame connecting plate 121 and the rear door frame connecting plate 123 of the door frame assembly 1 have several welded joint surfaces with the first side door frame 111 and the second side door frame 112 of the door frame portion 11 before the compensatory rotation. After the compensatory rotation toward the inside of the vehicle, the welded joint surfaces have gaps (or interference) and are not in joint, and it is necessary to reconstruct the joint surface digital model to make them fit again (see Figure 4 ).

[0107] Step S4b, reconstructing the digital model of the fitting surface in the large deformation area of ​​the vehicle door according to the monitoring result, so that the welding fitting surface in the large deformation area of ​​the vehicle door is restored to the initial fitting state.

[0108] Specifically, due to the different conditions of the fitting surface, it is necessary to formulate a digital model reconstruction strategy based on the change state of the original fitting surface after rotation. The specific steps include:

[0109] Case 1: When the monitoring result shows that only the door frame portion 11 and the door frame connecting plate 12 are partially in contact after rotation, and other contact surfaces are not in contact, the contact surface of the door frame connecting plate 12 is digitally reconstructed.

[0110] Specifically, Figure 8 As shown, the dotted line frame portion in the figure is the fitting surface area. When only the first side door frame 111 is fitted with the door frame rear connecting plate 123, the digital model of the fitting surface of the door frame rear connecting plate 123 is reconstructed.

[0111] Case 2: When the monitoring result shows that the three-layer bonding surfaces of the rear door frame portion 11, the door frame connecting plate 12 and the vehicle door inner panel 2 are bonded together, the bonding surface of the door frame portion 11 is digitally reconstructed.

[0112] Specifically, Fig. 9 As shown in the figure, the dotted line frame part is the bonding surface area, when the three layers of the door inner panel 2, the door frame front connecting plate 121, and the second side door frame 112 are welded and bonded together. In this case, the digital model of the door inner panel 2 cannot be changed, and the door frame front connecting plate 121 must be bonded with the door inner panel 2, so its digital model cannot be changed either. Only the digital model of the door frame welded on the outside can be changed to re-match with the connecting plate, so as to reconstruct the digital model of the second side door frame 112.

[0113] In a third aspect, the present application provides a split vehicle door, which is manufactured after deformation compensation processing using the pre-bending compensation method as described in any of the above items.

[0114] In summary, the present application divides the vehicle door into large and small deformation areas, and then adopts different pre-bending compensation methods to perform pre-bending compensation on the two areas. Furthermore, for the vehicle door area with larger deformation, the present application adopts the method of rotating the product digital model around a specific axis at a specific angle to obtain the process digital model (digital model of industrial molds, inspection fixtures, and fixtures), and the welding overlap area of ​​the door frame and the door frame connecting plate in the door frame assembly is matched, and the digital model is changed locally in small quantities. The large workload of CAE analysis and complete reconstruction of the door frame digital model is avoided, thereby solving the problem of long reconstruction cycle and poor accuracy of the digital model. The frequency and amplitude of subsequent industrial adjustments to the fixture are significantly reduced, ensuring the requirements of the clearance surface difference, sealing, and opening and closing force of the vehicle door, and ensuring quality.

[0115] 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.

[0116] 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.

[0117] 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 pre-bending compensation method for a split vehicle door, characterized in that: The pre-bending compensation method comprises: According to the deformation prediction result, the door is divided into a large deformation area and a small deformation area; Compensation adjustment of small deformation areas of the door is carried out by means of a fixture; Drive the large deformation area of ​​the door to perform digital model rotation according to the preset calculation angle with the door window frame water tangent line as the rotation axis; The condition of the welding fitting surface in the large deformation area of ​​the door is monitored, and the digital model of the fitting surface in the large deformation area of ​​the door is reconstructed according to the monitoring result, so that the welding fitting surface in the large deformation area of ​​the door is restored to the initial fitting state.

2. The pre-bending compensation method for a split vehicle door as claimed in claim 1, characterized in that: The door is divided into a large deformation area and a small deformation area according to the magnitude of the deformation, including: The door frame assembly (1) of the vehicle door is divided into a large deformation area, the door frame assembly (1) includes a door frame portion (11) and a door frame connecting plate (12), and the door frame connecting plate (12) is connected to both ends of the door frame portion (11); The door panel assembly of a vehicle door is divided into small deformation areas, and the door panel assembly comprises a vehicle door inner panel (2), an inner panel reinforcement plate (3) and a vehicle door outer panel (4).

3. The pre-bending compensation method for a split vehicle door as claimed in claim 2, characterized in that: The method of driving the large deformation area of ​​the door to perform digital-analog rotation according to a preset calculation angle with the door window frame water tangent line as the rotation axis includes: Calculating a preset rotation angle according to the size of the door frame assembly (1); The door frame portion (11) is driven to rotate at a preset rotation angle using a line connecting the two ends of the door frame connecting plate (12) as a rotation axis.

4. The pre-bending compensation method for a split vehicle door as claimed in claim 3, characterized in that: The step of calculating the preset rotation angle according to the size of the door frame assembly (1) comprises: Taking the first highest point of the door frame (11) in the Z direction of the vehicle, a perpendicular line is drawn from the first highest point to the rotation axis and intersects the rotation axis at a zero boundary point; Determining the second highest point of the door frame part (11) in the Z direction of the vehicle after the door frame part (11) is rotated according to the position of the door frame part (11) after the door frame part (11) is rotated; The preset rotation angle of the door frame part (11) is calculated according to the positions of the first highest point and the second highest point in the Z direction of the vehicle before and after the door frame part (11) rotates.

5. The pre-bending compensation method for a split vehicle door as claimed in claim 4, characterized in that: The method of calculating the rotation angle of the door frame part (11) according to the highest points H1 and H1' in the vehicle Z direction before and after the door frame part (11) rotates comprises: The distance T between the first highest point and the second highest point is set, and the preset rotation angle θ of the door frame part (11) is calculated according to the formula: θ=arccos((D1 2 +D1 2 -T 2 ) / 2*D1*D1) Wherein, D1 is the distance from the first highest point to the zero boundary point, and T is the distance between the first highest point and the second highest point.

6. The pre-bending compensation method for a split vehicle door as claimed in claim 5, characterized in that: The step of setting the distance T between the first highest point and the second highest point comprises: The distance T between the first highest point and the second highest point was set to 1.5 mm.

7. The pre-bending compensation method for a split vehicle door as claimed in claim 2, characterized in that: The monitoring of the welding joint surface condition in the large deformation area of ​​the door includes: After the rotation, the bonding state of all bonding surfaces between the door frame portion (11), the door frame connecting plate (12) and the vehicle door inner plate (2) is detected.

8. The pre-bending compensation method for a split vehicle door as claimed in claim 7, characterized in that: The step of reconstructing the digital model of the fitting surface in the large deformation area of ​​the door according to the monitoring result includes: When the monitoring result shows that only the door frame portion (11) and the door frame connecting plate (12) are partially in a fitting state after the rotation, and the other fitting surfaces are not in a fitting state, the fitting surface of the door frame connecting plate (12) is digitally reconstructed; When the monitoring result shows that the three-layer bonding surfaces of the rear door frame portion (11), the door frame connecting plate (12) and the vehicle door inner panel (2) are bonded together, the bonding surface of the door frame portion (11) is digitally reconstructed.

9. The pre-bending compensation method for a split vehicle door as claimed in claim 2, characterized in that: The method of compensating and adjusting the small deformation area of ​​the vehicle door by using a clamp comprises: using the clamp to compensate and adjust the deformation amount of the vehicle door inner panel (2), the inner panel reinforcement plate (3) and the vehicle door outer panel (4).

10. A split vehicle door, characterized in that: It is manufactured by performing deformation compensation processing using the pre-bending compensation method described in any one of claims 1 to 9.

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