Calculation method of door face difference adjustment and door installation method

Abstract

The invention discloses a method for calculating the adjustment amount of a vehicle door face difference and a method for installing and adjusting a vehicle door. The method for calculating the adjustment amount of a vehicle door face difference comprises: projecting an assembled vehicle door onto a plane perpendicular to a vehicle door panel, and obtaining on the plane the center distance between the centers of the upper and lower hinge nut holes of the vehicle door and the end point distance from the vehicle door end point to the center of the upper or lower hinge nut hole away from the end point; measuring the end point movement amount that needs to be adjusted for the end point; and solving the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the end point. The assembled vehicle door during the trial assembly process is projected onto a YZ plane, and by studying the orthographic projection profile of the vehicle door, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole is calculated so that the vehicle door actually reaches a qualified assembly face difference, thereby abstracting the calculation process of the adjustment amount, making theoretical calculation possible, and having an ingenious design, saving vehicle door installation and adjustment time, saving costs, and having a small workload and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of automobile doors, and in particular to a method for calculating a door face difference adjustment amount and a method for installing and adjusting the door. Background Art

[0002] The door system related to the dimension system consists of the door and the door hinge device. The door hinge device adopts a self-positioning installation method. The hinge installation hole on the door is a nut welded on the nut plate assembly on the door inner panel. The hole on the door inner panel is a through hole with a 1mm through hole on one side. Figure 1 . In order to ensure the Y-direction face difference between the front and rear doors, and the Y-direction face difference between the rear door and the rear triangular window, it is necessary to make necessary adjustments to the Y-direction of the door during the assembly and adjustment line. According to the Y-direction face difference of the actual installation of the door trial parts, it is a frequently used method to adjust the upper hinge mounting nut plate and the lower hinge mounting nut plate of the door separately or simultaneously in the Y-direction. This patent mainly focuses on the size compensation calculation method developed for the door size system composed of the door and the nut plate. The X direction of the vehicle refers to the front and rear direction of the vehicle, the Y direction refers to the left and right direction of the vehicle, and the Z direction refers to the vertical direction.

[0003] In the welding and assembly environment, the door size system is often affected by the stability of the precision of different batches of parts, resulting in different degrees of displacement changes in its appearance size, which ultimately affects the appearance gap and flushness size of the door system. Figure 2 and Figure 3 The figure shows a view looking down from the roof. Figure 2 The best ideal position is shown, and the Y-direction surface difference dimension of the front door outer panel and the rear door outer panel is F′=0; Figure 3 It indicates that the front door outer panel is offset to the outside by F relative to the rear door outer panel, and there is a surface difference, such as Figure 4 As shown, the front door outer panel is adjusted to the dotted line position during adjustment so that the door has an ideal surface difference value. In order to improve the appearance size, the driving door system needs to be compensated for the size.

[0004] One of the commonly used methods at present is to directly compensate the profile position of the relevant parts of the door according to the corresponding displacement size change. This method can effectively compensate for the dimensional changes of the door system in the welding and assembly environment, but the adjustment of the door profile position will lead to the adjustment of the tooling profiles such as the stamping die, welding and edging membrane of the door outer panel, door inner panel or door frame parts on the door, which is expensive and has a long adjustment cycle, thus affecting the time cycle for improving the problem defect. This method is currently only considered when there is a need to compensate for the profile of the window frame.

[0005] The second commonly used method is to adjust the position of the nut plate on the upper or lower hinge of the car door based on experience. By adjusting the nut plate positions of the upper and lower hinges in the Z direction or adjusting the nut plate positions of the upper and lower hinges in the Y direction at the same time, the car door can produce corresponding displacements up and down and inside and outside on the body-in-white. This is relatively intuitive and is not a problem studied in this patent. This patent is to study the displacement of the car door in the Y direction caused by adjusting the nut plate position of the upper hinge alone or adjusting the nut plate position of the lower hinge alone. At present, because the nut plates installed on the upper and lower hinges have a total of four mounting holes, the adjustment amount and effect are difficult to accurately predict in advance. There is no mature calculation formula. It is often necessary to adjust multiple times based on experience to achieve the target effect, which is time-consuming and requires a large workload for welding and adjustment. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for calculating the adjustment amount of a vehicle door face difference and a vehicle door installation method, so that the vehicle door installation process has low cost, short implementation period and strong operability.

[0007] In order to solve the above technical problems, the present invention provides a method for calculating the door face difference adjustment amount, comprising the following steps:

[0008] Step A1: Project the assembled vehicle door onto a plane perpendicular to the vehicle door panel, and on the plane: obtain the center distance between the center of the upper hinge nut hole of the vehicle door and the center of the lower hinge nut hole and the end point distance from the end point of the vehicle door to the center of the upper hinge nut hole or the center of the lower hinge nut hole away from the end point, wherein the end point includes the highest point or the lowest point;

[0009] Step A2: calculating the amount of movement of the endpoint that needs to be adjusted within the plane when the fixed posture of the door is adjusted so that the door has a qualified installation surface difference;

[0010] Step A3: In the plane, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the endpoint is solved according to the center distance, the endpoint distance and the endpoint movement amount.

[0011] In the vehicle's coordinate system, the plane is usually a YZ plane, that is, a cross section of the vehicle. After the door is installed, it is kept closed and then projected into the plane. That is, the projected door profile can show the door assembly posture and face difference. The Y direction mentioned later refers to the left and right direction of the vehicle, the X direction refers to the front and rear direction of the vehicle, and the Z direction refers to the up and down direction of the vehicle. The nut plate is welded on the door inner panel. There are several nuts on the nut plate to connect the hinges. These nuts are generally arranged symmetrically, so the geometric center of these nut holes is the center of the upper hinge nut hole and the center of the lower hinge nut hole.

[0012] In the above-mentioned door face difference adjustment amount calculation method, the door assembled during the trial assembly process is projected into a YZ plane, and by studying the positive projection contour of the door and by using the center distance, end point distance and end point movement amount that can be actually measured, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole is calculated so that the door actually reaches a qualified assembly face difference. This is the adjustment amount for adjusting the nut plate welding position in the subsequent door installation and adjustment process, thereby making theoretical calculation possible and ingeniously conceived. In addition, when a poor face difference occurs during the trial assembly of the door, the algorithm is used to quickly and accurately predict in advance, without the need for multiple installations and adjustments based on experience, thereby reducing the number of installation and adjustments during the trial assembly of the door. The method has strong operability, low cost, fast and efficient calculation, small workload, and greatly shortens the installation and adjustment time.

[0013] As an improvement of the door face difference adjustment amount calculation method of the present invention, the step A3 includes:

[0014] In the plane,

[0015] Step B1: The adjustment of the door fixing posture so that the door has a qualified installation surface difference is equivalent to: rotating the door by an angle with a straight line passing through the center of the upper hinge nut hole or the center of the lower hinge nut hole far away from the end point and perpendicular to the plane as the rotation axis, so that the end point moves by the end point movement amount, and the angle is recorded as the rotation angle, and the end point distance is recorded as the rotation radius;

[0016] Step B2: solving the rotation angle according to the rotation radius and the endpoint movement amount;

[0017] Step B3: Calculate the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the end point according to the rotation angle and the center distance.

[0018] When the door has assembly surface difference (generally -2 to 2mm), there are usually two main surface difference problems: one is that the deviation of the upper part of the door is large. At this time, the actual value of the deviation of the lower part of the door is very small, and the adjustment required for the corresponding lower hinge nut hole center is even smaller. Therefore, it can be simplified and the lower hinge nut hole center is regarded as fixed. That is, the endpoint in the door surface difference adjustment calculation method takes the highest point. In the YZ projection plane, by abstracting the adjustment of the upper part of the door in the Y direction as the rotation of the axis of the entire door around the center of the lower hinge nut hole, the theoretical calculation is reasonably simplified, which makes the theoretical calculation possible and shortens the calculation time. By measuring the highest point movement amount that needs to be compensated in the welding assembly environment in the YZ projection plane, the rotation angle of the upper part of the door is calculated, and then the adjustment amount of the center of the upper hinge nut hole of the door is calculated. In actual adjustment, since the adjustment amount is small and almost arranged along the Y direction, the nut plate can be translated from the initial position along the Y direction by an adjustment amount to complete the installation and adjustment.

[0019] The other is that the deviation of the lower part of the door is large. At this time, the actual value of the deviation of the upper part of the door is very small, and the amount of adjustment required for the corresponding upper hinge nut hole center is even smaller. Therefore, it can be simplified and the upper hinge nut hole center is considered to be fixed. That is, the endpoint of the door face difference adjustment calculation method takes the lowest point. In the YZ projection plane, by abstracting the adjustment of the lower part of the door in the Y direction as the rotation of the entire door around the axis of the upper hinge nut hole center, the theoretical calculation is reasonably simplified, and the theoretical calculation is further made possible. The specific calculation process is the same as the above endpoint taking the highest point.

[0020] A further improvement of the above-mentioned method for calculating the door face difference adjustment amount, the step B2 includes: in the plane, a first isosceles triangle is formed according to the endpoint, the center of the upper hinge nut hole or the center of the lower hinge nut hole away from the endpoint, and the position point formed after rotation of the endpoint, and the rotation radius is the length of two sides of the first isosceles triangle, the endpoint movement amount is the length of the third side of the first isosceles triangle, and the cosine theorem is used to calculate the angle between the two sides, which is the rotation angle.

[0021] The first isosceles triangle is formed by rotating the end points before and after and the center of the hinge nut hole on the rotating axis, and then the rotation angle is calculated using the cosine theorem, and the calculation is reasonable and accurate.

[0022] Another improvement of the above-mentioned method for calculating the door face difference adjustment amount, step B3 includes: in the plane, according to the second isosceles triangle formed by rotating the line connecting the center of the upper hinge nut hole and the center of the lower hinge nut hole by the rotation angle, using the cosine theorem to solve the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the end point.

[0023] Because when the nut plate welding position is subsequently adjusted according to the calculated adjustment amount, for convenience, the nut plate welding position is usually directly translated along the Y direction of the vehicle by an adjustment amount (note that this direction is based on the assumption that the door is assembled on the body and closed at this time). Although the calculated adjustment amount is slightly larger than the actual required adjustment amount, the difference is so small that the actual impact can be ignored.

[0024] Another improvement of the above-mentioned door face difference adjustment amount calculation method is that in step B3, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole is the adjustment amount along the left and right direction of the vehicle, that is, the Y-direction adjustment amount.

[0025] Furthermore, the step B3 comprises:

[0026] In the plane, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the endpoint is a right angle, and the diagonal of the right angle is the rotation angle, and the line connecting the center of the upper hinge nut hole and the center of the lower hinge nut hole is another right angle. The Y-axis adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the endpoint is solved according to the inverse tangent function.

[0027] The Y-axis adjustment amount is directly obtained through the inverse tangent function, which is closer to the actual required adjustment value, and the calculation is more accurate for subsequent adjustment operations.

[0028] As another improvement of the door face difference adjustment amount calculation method of the present invention, the endpoint is the highest point, and the step A2 measures the highest point movement amount, and the step A3 solves and obtains: the upper rotation radius, the upper rotation angle and the adjustment amount of the upper hinge nut hole center, in the plane:

[0029] The center distance is the height difference between the center of the upper hinge nut hole and the center of the lower hinge nut hole.

[0030] The value of the upper rotation radius is taken as the height difference between the highest point of the door and the center of the lower hinge nut hole,

[0031] The value of the tail rotation radius is taken as the height difference between the center of the lower hinge nut hole and the highest point of the vehicle door.

[0032] Since the value of the highest point movement is very small, it can be almost ignored compared with the values ​​of the center distance, upper rotation radius and tail rotation radius. Therefore, the center distance, upper rotation radius and tail rotation radius are very different from the height difference of the corresponding two end points, and the corresponding values ​​are taken to simplify the calculation process, improve efficiency, and the impact on the calculation results can be ignored. In addition, through the equivalent substitution of parameters, the calculation parameters that need to be obtained in step A3 of the door face difference adjustment calculation method: center distance, upper rotation radius (end point distance), etc. are all known quantities, and can be quickly obtained from the digital model, further simplifying the calculation process.

[0033] In the above-mentioned door face difference adjustment amount calculation method, the highest point movement amount is obtained by actual measurement and calculation. Measurement method: Use a gap face difference gauge, take the surface of the rear door as the reference zero surface, and measure the face difference between the surface of the front door and the surface of the rear door. A positive value indicates that the surface of the front door is higher than the surface of the rear door, that is, the front door is offset to the outside of the vehicle, and a negative value indicates that the surface of the front door is lower than the surface of the rear door. The highest point movement amount is obtained by measuring the distance from the highest point to the optimal position on the actual vehicle, thereby improving the accuracy of the theoretical calculation.

[0034] As another improvement of the door face difference adjustment amount calculation method of the present invention, the center of the upper hinge nut hole is the center of the line connecting the centers of the two nut holes of the door upper hinge mounting nut plate, that is, the geometric center of the nut hole on the nut plate mentioned above. Generally, the upper hinge mounting nut plate of the door has two nut holes arranged up and down. Taking the midpoint of the line connecting the centers of the two nut holes as the abstract center of the door upper hinge installation is accurate and reasonable. The same method is used to obtain the center of the lower hinge nut hole of the door.

[0035] As another improvement of the door face difference adjustment amount calculation method of the present invention, the endpoint is the highest point, and the step A2 measures the highest point movement amount, and the step A3 solves and obtains: the upper rotation radius, the upper rotation angle and the adjustment amount of the upper hinge nut hole center, and the method further includes:

[0036] Step A4: in the plane, calculating the passive movement amount of the lowest point of the door after rotating by the upper rotation angle with the straight line passing through the center of the lower hinge nut hole and perpendicular to the plane as the rotation axis, and measuring whether the door has a qualified installation surface difference if the lowest point of the door moves according to the passive movement amount, and if so, the adjustment amount of the center of the upper hinge nut hole is the required amount, and the door surface difference adjustment amount calculation method is terminated;

[0037] If not, change the value of the highest point movement within the tolerance range, and recalculate the adjustment amount of the upper hinge nut hole center and the passive movement of the lowest point, until the lowest point of the door moves according to the passive movement so that the door has a qualified installation surface difference. The final calculated adjustment amount of the upper hinge nut hole center is the required value. If changing the highest point movement within the tolerance range cannot make the lowest point of the door move according to the passive movement so that the door has a qualified installation surface difference, then the door size deviation cannot be calculated.

[0038] In the above-mentioned door face difference adjustment amount calculation method, the calculation of the passive movement amount includes:

[0039] In the plane, the distance from the lowest point of the door to the center of the lower hinge nut hole is obtained and recorded as the tail rotation radius;

[0040] The passive movement amount of the lowest point of the door is solved according to the upper rotation angle and the rear rotation radius.

[0041] Specifically, solving the passive movement amount of the lowest point of the door according to the upper rotation angle and the rear rotation radius includes: taking the rear rotation radius as the two sides of a triangle, taking the upper rotation angle as the angle between the two sides, and calculating the length of the third side according to the cosine theorem, which is the passive movement amount.

[0042] After the upper part of the door rotates, the corresponding lower part rotates passively. According to the tolerance requirements of the door face difference (for example, -2 to 2mm), the lowest point is measured to see whether it meets the requirements after being moved according to the passive movement amount. If it meets the requirements, the calculated adjustment amount of the center of the upper hinge nut hole is feasible and is adjusted according to the calculated adjustment amount; if it does not meet the requirements, the highest point movement amount is gradually adjusted within the tolerance range of the highest point passive movement amount, and the adjustment amount of the center of the upper hinge nut hole is recalculated. At the same time, the passive movement amount of the new lowest point is calculated, and then it is determined whether the lowest point meets the door face difference tolerance requirements after being moved and adjusted according to the passive movement amount. The adjustment is tried until it meets the door face difference tolerance requirements. If it still cannot be achieved, it indicates that the geometric size of the door parts is too large and the surface size of the parts needs to be rectified.

[0043] The passive movement of the lowest point when the door rotates is calculated through the upper rotation angle. Combined with the tolerance range of the door surface difference, it is judged whether the calculated Y-axis adjustment amount of the center of the upper hinge nut hole is reasonable, thereby improving accuracy and making the calculation process more rigorous.

[0044] In order to solve the above technical problems, the present invention provides a vehicle door installation and adjustment method, comprising the following steps:

[0045] Step 1: Weld the nut plate to the preset position of the door inner panel;

[0046] Step 2: Bolts are passed through the hinge holes and the door inner panel, and are threadedly connected with the nut holes of the nut plate to assemble the door onto the vehicle body;

[0047] Step 3: Measure the actual surface difference of the door.

[0048] If the actual face difference meets the requirement, the door installation method is terminated, and the nut plate is kept welded at the preset position for subsequent production.

[0049] If the actual flushness does not meet the requirement, the above-mentioned door flushness adjustment amount calculation method is used to calculate the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole;

[0050] Step 4: Move the welding position of the nut plate near the end point from the preset position along the Y direction of the vehicle by the adjustment amount as the welding position of the nut plate in subsequent production. (The Y direction of the vehicle refers to: assuming that the door is in the horizontal movement along the left and right direction of the vehicle after assembly and closing)

[0051] As an improvement to the above-mentioned door adjustment method, in step 3, if the actual face difference does not meet the requirement,

[0052] When the deviation of the upper part of the door is greater than that of the lower part, the above-mentioned door face difference adjustment amount calculation method is adopted, the endpoint is taken as the highest point, and the adjustment amount of the center of the upper hinge nut hole is calculated;

[0053] When the deviation of the upper part of the door is not greater than that of the lower part, the above-mentioned door face difference adjustment amount calculation method is adopted, the endpoint is taken as the lowest point, and the adjustment amount of the center of the lower hinge nut hole is calculated.

[0054] In the above-mentioned door installation and adjustment method, the adjustment amount of the upper hinge nut plate or the lower hinge nut plate is calculated by measuring the face difference after the trial door is assembled. When the deviation of the upper part of the door is greater than that of the lower part, the above-mentioned door face difference adjustment amount calculation method with the highest end point is adopted. When the deviation of the upper part is not greater than that of the lower part, the above-mentioned door face difference adjustment amount calculation method with the lowest end point is adopted. The Y-axis adjustment amount of the corresponding nut plate can be obtained quickly and accurately, and the adjustment of the nut plate welding tooling can be completed efficiently, saving the cost of installation and adjustment and improving efficiency.

[0055] In summary, by adopting the above-mentioned door face difference adjustment amount calculation method and door installation method, the endpoint movement amount that needs to be compensated for the upper (or lower) end point of the door in the welding assembly environment is used to calculate the adjustment amount required for the door hinge installation nut plate, thereby guiding the adjustment of the nut plate welding fixture. The cost required is low, the calculation is fast and accurate, the implementation period is short, and the operability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In the attached picture:

[0057] Figure 1 This is a structural diagram of the door nut mounting hole of the present invention.

[0058] Figure 2 It is a first top view schematic diagram of the upper surface difference of the vehicle door system of the present invention.

[0059] Figure 3 It is a second top view schematic diagram of the upper surface difference of the vehicle door system of the present invention.

[0060] Figure 4 It is a third top view schematic diagram of the upper surface difference of the vehicle door system of the present invention.

[0061] Figure 5 This is a projection view of the vehicle door of the present invention on the XY plane.

[0062] Figure 6 It is a schematic diagram of door adjustment of the present invention. DETAILED DESCRIPTION

[0063] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0064] Example 1

[0065] The present invention provides a method for calculating the adjustment amount of a door face difference. The method is introduced below by taking the highest point as the endpoint, and includes the following steps:

[0066] Step A1: Project the assembled door (closed state) onto a YZ plane. In the YZ plane, obtain the center distance between the center of the upper hinge nut hole and the center of the lower hinge nut hole, the distance from the highest point of the door to the center of the lower hinge nut hole, i.e., the upper rotation radius, and the distance from the lowest point of the door to the center of the lower hinge nut hole, i.e., the rear rotation radius. In the YZ plane, the door contour obtained by projection is as follows: Figure 5 As shown, the main panels of the door are projected perpendicular to the plane.

[0067] Step A2: Calculate the movement amount of the highest point that needs to be adjusted in the plane when the fixed posture of the door is adjusted so that the door has a qualified installation surface difference.

[0068] like Figure 5 As shown, the adjusted door panel surface is indicated by the dotted line. The displacement change of the highest point needs to be compensated by the movement amount, that is, the movement amount of the highest point is recorded as Ly; and the displacement change of the lowest point of the door needs to be compensated by the movement amount, that is, the movement amount of the lowest point is recorded as Ly′; It should also be noted that the door surface difference calculation method is used when Ly is greater than Ly′.

[0069] Step A3: In the YZ plane, calculate the adjustment amount of the upper hinge nut hole center or the lower hinge nut hole center close to the endpoint based on the center distance, endpoint distance and endpoint movement. In the YZ plane, the specific calculation process is as follows:

[0070] Step B1: Adjust the fixed posture of the door so that the door has a qualified installation surface difference. The equivalent method is: rotate the door at an angle with the straight line passing through the center of the lower hinge nut hole and perpendicular to the YZ plane as the rotation axis. After the rotation, the endpoint moves by the endpoint movement amount. This angle is recorded as the upper rotation angle, and the endpoint distance is recorded as the rotation radius.

[0071] First, set the parameters, such as Figure 6 As shown:

[0072] α: upper rotation angle;

[0073] P 1 : The center of the line connecting the centers of the two nut holes for installing the upper hinge is the center of the nut hole of the upper hinge. The position after rotation is recorded as P 1 ′;

[0074] P 2 : The center of the line connecting the two nut holes for installing the lower hinge is the center of the lower hinge nut hole. The position after rotation is recorded as P2 ′;

[0075] P 1 With P 2 The center distance is denoted as P 1 P 2 ;

[0076] After adjustment to make the door surface difference qualified, the hinge nut hole group on the door moved L in the Y direction. a That is, the Y-axis adjustment amount of the center of the upper hinge nut hole. The adjustment amount of the center of the upper hinge nut hole is L a ′; The door lower hinge nut hole group moves L in the opposite direction of Y b That is, the Y-axis adjustment amount of the center of the lower hinge nut hole. The adjustment amount of the center of the lower hinge nut hole is L b ′;

[0077] Door highest point U 1 , the lowest point of the door U 2 , after rotation, they are denoted as U 1 ′、U 2 ′;

[0078] Door highest point U 1 Center of lower hinge nut hole P 2 The distance is the upper rotation radius, denoted as R 1 , the lowest point of the door U 2 Center of lower hinge nut hole P 2 The distance is the tail rotation radius, denoted by R 2 ;

[0079] C 1 : The height difference between the center of the upper hinge nut hole and the center of the lower hinge nut hole;

[0080] L 1 : The height difference between the highest point of the door and the center of the upper hinge nut hole;

[0081] L 2 : The height difference between the center of the lower hinge nut hole and the lowest point of the door.

[0082] Since Ly is greater than Ly', and the values ​​of Ly and Ly' are generally between 1-3 mm, 1 , C 1 , L 2 The value of 240-450mm is very small compared to the value of 240-450mm, so the rotation adjustment action of the door is equivalent to the following Figure 6 Shown: Center P of upper hinge nut hole 1 The center of the following hinge nut holes is P 2 The rotation point is rotated by an angle of α, which is equivalent to the door passing through the center of the lower hinge nut hole P 2The axis perpendicular to the YZ plane is rotated by an angle α.

[0083] In addition, in order to simplify the calculation and quickly obtain the value from the digital model, let P 1 P 2 =C 1 , R 1 =L 1 +C 1 , R 2 =L 2 , the influence on the calculation results can be ignored.

[0084] Step B2: Calculate the upper rotation angle according to the upper rotation radius and the highest point movement. 1 are the two sides of the triangle, and the highest point movement amount Ly is the third side. The angle between the two sides is calculated according to the cosine theorem, which is the value of the upper rotation angle α.

[0085] According to the cosine formula, the functional relationship between the Y-axis adjustment amount La of the upper hinge mounting nut plate and the Y-axis movement amount Ly of the highest point of the door is:

[0086] Ly=R 1 2 +R 1 2 -2R 1 R 1 cosα;...(Ⅰ)

[0087] After simplification, Ly=(L 1 +C 1 ) 2 +(L 1 +C 1 ) 2 -2(L 1 +C 1 ) 2 cosα;...(Ⅱ)

[0088] Ly can be obtained by actual measurement and calculation, L 1 , C 1 For design dimensions, the upper rotation angle α can be calculated using the above formula (II).

[0089] Step B3: Calculate the adjustment amount of the center of the upper hinge nut hole based on the upper rotation angle and center distance.

[0090] Preferably, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole is the adjustment amount along the left-right direction of the vehicle, that is, the Y-axis adjustment amount. Specifically, the adjustment amount of the center of the upper hinge nut hole is calculated as a right angle, and the diagonal of the right angle is the upper rotation angle α, and the center distance is the other right angle. The Y-axis adjustment amount of the center of the upper hinge nut hole is solved according to the inverse tangent function. Since α is small, the triangle formed by the center of the upper hinge nut hole and the center of the lower hinge nut hole after rotation is simplified to a right triangle, and the Y-axis adjustment amount L of the center of the upper hinge nut hole is solved. a The formula is:

[0091] L a =C 1 / tanα; ...(Ⅳ);

[0092] Note that the maximum adjustment of the nut plate is ±1mm (the through hole of the door inner panel is ±1mm. If this value is exceeded, the door inner panel will cover the nut hole and it will not be feasible).

[0093] It should also be noted that when the welding position of the nut plate is subsequently adjusted according to the calculated adjustment amount, for convenience, the welding position of the nut plate is usually directly translated along the Y direction of the vehicle by an adjustment amount (note that this direction is based on the assumption that the door is assembled on the body and closed at this time). Although the calculated adjustment amount is slightly larger than the actual required adjustment amount, the difference is so small that the actual impact can be ignored.

[0094] Step A4: in the plane, calculate the passive movement amount after the lowest point of the door is rotated by an upper rotation angle with a straight line passing through the center of the lower hinge nut hole and perpendicular to the plane as the rotation axis, and calculate whether the door has a qualified installation face difference if the lowest point of the door moves according to the passive movement amount. If so, the adjustment amount of the center of the upper hinge nut hole is the required amount, and the door face difference adjustment amount calculation method is terminated;

[0095] If not, change the highest point movement value within the tolerance range, and recalculate the adjustment amount of the upper hinge nut hole center and the passive movement of the lowest point, until the lowest point of the door moves according to the passive movement so that the door has a qualified installation surface difference. The final calculated adjustment amount of the upper hinge nut hole center is the required amount. If changing the highest point movement within the tolerance range still cannot make the lowest point of the door move according to the passive movement so that the door has a qualified installation surface difference, then the door size deviation cannot be calculated.

[0096] The passive movement of the lowest point of the door is solved according to the upper rotation angle and the rear rotation radius. Similar to formula (II), the cosine theorem is used. The rear rotation radius is the two sides of the triangle, and the upper rotation angle is the angle between the two sides. The length of the third side is calculated according to the cosine theorem, which is the passive movement of the lowest point Ly′:

[0097] Ly′=L 2 2 +L 2 2 -2L 1 L 2 cosα;...(III).

[0098] Affected by the adjustment of the nut plate, the Y-direction displacement change Ly' of the lower part of the door system is calculated by the displacement Ly required to compensate for the Y-direction displacement change of the upper part of the door system. According to the tolerance requirement of the door surface difference (for example, -2 to 2mm), it is determined whether Ly' meets the requirement. If it does, the Y-direction adjustment amount L of the nut plate is a It is feasible to adjust according to the calculated adjustment amount; if Ly′ is out of tolerance, then within the tolerance range of Ly, adjust the movement amount Ly to be compensated, and recalculate the adjustment amount L of the nut plate a , and calculate the new Ly' at the same time, and then judge whether the lowest point position meets the tolerance requirements of the door surface difference after moving Ly', until it meets the requirements. If this calculation formula cannot meet the tolerance requirements of Ly and Ly' at the same time, it indicates that the geometric size of the door part is too large and the surface size of the part needs to be corrected.

[0099] The present invention provides a vehicle door installation and adjustment method, comprising the following steps:

[0100] Step 1: Weld the nut plate to the preset position of the door inner panel;

[0101] Step 2: Pass the bolts through the hinge holes and the door inner panel, and thread them into the nut holes of the nut plate to assemble the door onto the vehicle body;

[0102] Step 3: Measure the actual surface difference of the door.

[0103] If the actual face difference meets the requirement, the door adjustment method is terminated, and the nut plate is welded at the preset position for subsequent production.

[0104] If the actual flushness does not meet the requirement, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole is calculated by using the above-mentioned door flushness adjustment amount calculation method;

[0105] Step 4: Move the welding position of the nut plate near the end point from the preset position along the Y direction of the vehicle after the door is assembled and closed by an adjustment amount, which serves as the subsequent production nut plate welding position.

[0106] Optional, if the actual face difference does not meet the requirements,

[0107] When the deviation of the upper part of the door is greater than that of the lower part, the above door face difference adjustment calculation method is adopted, the endpoint is the highest point, and the adjustment amount of the center of the upper hinge nut hole is calculated;

[0108] When the deviation of the upper part of the door is not greater than that of the lower part, the above door surface difference adjustment method is used, the endpoint is taken as the lowest point, and the adjustment amount of the center of the lower hinge nut hole is calculated.

[0109] By adopting the above-mentioned door face difference adjustment amount calculation method and door installation method, the adjustment amount required for the door hinge installation nut plate is calculated through the movement amount that needs to be compensated for the Y-direction displacement change of the upper (or lower) door system in the welding assembly environment, thereby guiding the adjustment of the nut plate welding fixture. The cost required is low, the calculation is fast and accurate, the implementation period is short, and the operability is strong.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A method for calculating the door face difference adjustment amount, characterized in that: The steps include: Step A1: Project the assembled vehicle door onto a plane perpendicular to the vehicle door panel, and on the plane: obtain the center distance between the center of the upper hinge nut hole of the vehicle door and the center of the lower hinge nut hole and the end point distance from the end point of the vehicle door to the center of the upper hinge nut hole or the center of the lower hinge nut hole away from the end point, wherein the end point includes the highest point or the lowest point; Step A2: calculating the amount of movement of the endpoint that needs to be adjusted within the plane when the fixed posture of the door is adjusted so that the door has a qualified installation surface difference; Step A3: in the plane, solving the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the endpoint according to the center distance, the endpoint distance and the endpoint movement amount; The step A3 comprises: within the plane, Step B1: The adjustment of the door fixing posture so that the door has a qualified installation surface difference is equivalent to: rotating the door by an angle with a straight line passing through the center of the upper hinge nut hole or the center of the lower hinge nut hole far away from the end point and perpendicular to the plane as the rotation axis, so that the end point moves by the end point movement amount, and the angle is recorded as the rotation angle, and the end point distance is recorded as the rotation radius; Step B2: solving the rotation angle according to the rotation radius and the endpoint movement amount; Step B3: Calculate the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the end point according to the rotation angle and the center distance.

2. A method for calculating door face difference adjustment according to any one of claim 1, characterized in that: The step B2 comprises: In the plane, a first isosceles triangle is formed by the endpoint, the center of the upper hinge nut hole or the center of the lower hinge nut hole away from the endpoint, and the position point formed after rotation of the endpoint, and the rotation radius is the length of two sides of the first isosceles triangle, the endpoint movement amount is the length of the third side of the first isosceles triangle, and the angle between the two sides is calculated using the cosine theorem, which is the rotation angle.

3. The method for calculating the door face difference adjustment amount according to claim 1, characterized in that: In step B3, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole is the adjustment amount along the left-right direction of the vehicle, that is, the Y-direction adjustment amount.

4. The method for calculating the door face difference adjustment amount according to claim 3, characterized in that: The step B3 comprises: In the plane, the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the endpoint is a right angle, and the diagonal of the right angle is the rotation angle, and the line connecting the center of the upper hinge nut hole and the center of the lower hinge nut hole is another right angle. The Y-axis adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole close to the endpoint is solved according to the inverse tangent function.

5. The method for calculating the door face difference adjustment amount according to claim 1, characterized in that: The endpoint is the highest point, and the step A2 measures the movement of the highest point. The step A3 solves and obtains: the upper rotation radius, the upper rotation angle and the adjustment amount of the center of the upper hinge nut hole. The method further includes: Step A4: in the plane, calculating the passive movement amount of the lowest point of the door after rotating by the upper rotation angle with the straight line passing through the center of the lower hinge nut hole and perpendicular to the plane as the rotation axis, and measuring whether the door has a qualified installation surface difference if the lowest point of the door moves according to the passive movement amount, and if so, the adjustment amount of the center of the upper hinge nut hole is the required amount, and the door surface difference adjustment amount calculation method is terminated; If not, change the value of the highest point movement within the tolerance range, and recalculate the adjustment amount of the upper hinge nut hole center and the passive movement of the lowest point, until the lowest point of the door moves according to the passive movement so that the door has a qualified installation surface difference. The final calculated adjustment amount of the upper hinge nut hole center is the required value. If changing the highest point movement within the tolerance range cannot make the lowest point of the door move according to the passive movement so that the door has a qualified installation surface difference, then the door size deviation cannot be calculated.

6. A method for calculating door face difference adjustment according to any one of claim 5, characterized in that: The calculating the passive movement amount comprises: In the plane, the distance from the lowest point of the door to the center of the lower hinge nut hole is obtained and recorded as the tail rotation radius; The passive movement amount of the lowest point of the door is solved according to the upper rotation angle and the rear rotation radius.

7. The method for calculating the door face difference adjustment amount according to claim 6, characterized in that: The endpoint is the highest point, and the step A2 measures the movement of the highest point. The step A3 solves and obtains: the upper rotation radius, the upper rotation angle and the adjustment amount of the center of the upper hinge nut hole. In the plane: The center distance is the height difference between the center of the upper hinge nut hole and the center of the lower hinge nut hole. The value of the upper rotation radius is taken as the height difference between the highest point and the center of the lower hinge nut hole, The value of the tail rotation radius is taken as the height difference between the center of the lower hinge nut hole and the highest point.

8. A method for adjusting a vehicle door, characterized in that: The steps include: Step 1: Weld the nut plate to the preset position of the door inner panel; Step 2: Bolts are passed through the hinge holes and the door inner panel, and are threadedly connected with the nut holes of the nut plate to assemble the door onto the vehicle body; Step 3: Measure the actual surface difference of the door. If the actual face difference meets the requirement, the door installation method is terminated, and the nut plate is kept welded at the preset position for subsequent production. If the actual flushness does not meet the requirement, the door flushness adjustment amount calculation method as described in any one of claims 1 to 5 is used to calculate the adjustment amount of the center of the upper hinge nut hole or the center of the lower hinge nut hole; Step 4: Move the welding position of the nut plate near the end point from the preset position along the Y direction of the vehicle by the adjustment amount as the subsequent production of the nut plate welding position.

9. A vehicle door adjustment method according to claim 8, characterized in that: In step 3, if the actual face difference does not meet the requirement, When the deviation of the upper part of the door is greater than that of the lower part, the endpoint is taken as the highest point, and the adjustment amount of the center of the upper hinge nut hole is calculated; When the deviation of the upper part of the door is not greater than that of the lower part, the endpoint is taken as the lowest point, and the adjustment amount of the center of the lower hinge nut hole is calculated.

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