Front door composite inspection fixture and inspection method thereof

Abstract

The present invention relates to the field of automobile door detection technology, and discloses a front door composite inspection fixture, including a base plate, a vertical base surface installed on the base plate, a plurality of auxiliary support blocks for supporting the door provided at the lower part of the base surface, a plurality of reference surfaces for surface support of the door, reference pins for positioning the interior of the door and the edging film, a hinge installation reference mounting block simulating the hinge mounting hole of the door, a hinge reference mounting block simulating the hinge mounting hole of the vehicle body, a pressure plate for pressing the door, a door detection block for detecting the door, a sealing ring detection pin for detecting the sealing ring, and a face difference table rapid correction block. The present invention also discloses a detection method for the front door composite inspection fixture. The front door composite inspection fixture and its detection method of the present invention can measure the process accuracy of each single product and assembly of the front door, assist process and quality personnel to quickly find out the cause of poor accuracy and solve it, improve the quality maturation speed, and save labor.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile door detection, and in particular to a front door composite inspection tool and a detection method thereof. Background Art

[0002] After the car's front door is hingedly mounted on the body, the construction conditions of the front door and its surroundings (gaps, step differences) are an important part of the appearance. Consumers tend to pay intuitive and comprehensive attention to this aspect when purchasing a car. This also affects consumers' determination to purchase the car. Therefore, the accuracy of the front and rear doors naturally becomes a key control point for OEMs.

[0003] At the same time, as the opening and closing parts of the car, the car door is produced by combining multiple parts through welding, gluing, hemming, bolting, etc. The accuracy of not only the component parts such as the door frame, inner panel, and outer panel has a direct impact on the appearance of the finished car, but also the various processing processes have an impact. Therefore, the front door has different states and benchmarks during the production process: for example, on the welding fixture, this is called the fixture state, and the benchmark with the same setting as the fixture (fixture benchmark) needs to be used to check the accuracy; hemming in the hemming mold is called the mold state, and the benchmark with the same setting as the mold needs to be used to check the accuracy; using the mounting holes of the upper and lower hinges of the front door to confirm the door accuracy is called the hinge installation benchmark; confirming the accuracy after installing the upper and lower hinges of the front door is called the hinge benchmark; matching the front and rear doors based on the state of the finished vehicle to confirm the accuracy is called the matching benchmark. The above five benchmarks can not only confirm the accuracy of the front door assembly, but also the accuracy of each state in the process, helping process personnel quickly confirm the accuracy of the front door at each link in the process from single product to completed vehicle, and enable rapid mastery.

[0004] If you want to achieve rapid product quality, you need to quickly determine whether the accuracy of the inner panel, outer panel, and door frame products meets the drawings, and whether the sub-assemblies and assemblies have accuracy fluctuations or deterioration in accuracy during various process steps. At the same time, you need to confirm the accuracy of the sub-assemblies and assemblies under different benchmarks (fixture benchmark, mold benchmark, hinge installation benchmark, and hinge benchmark) to quickly confirm the impact of connecting parts or tooling fixtures and hemming molds on accuracy. However, many OEMs can only confirm the accuracy of the final processed front door through inspection fixtures, but have no way to confirm the process accuracy. Summary of the Invention

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned technology and provide a front door composite inspection fixture and its inspection method, which can measure the process accuracy of each single product and assembly of the front door, assist process and quality personnel to quickly find the cause of poor accuracy and solve it, improve the quality maturation speed, and save labor.

[0006] To achieve the above-mentioned purpose, the front door composite inspection fixture designed by the present invention includes a base plate, a vertical base surface is installed on the base plate, and a plurality of auxiliary support blocks for supporting the vehicle door are provided at the lower part of the base surface. The base surface is also provided with a plurality of reference surfaces for surface supporting the vehicle door, reference pins for positioning the interior of the vehicle door and the edging film, a hinge installation reference mounting block simulating the hinge mounting hole of the vehicle door, a hinge reference mounting block simulating the hinge mounting hole of the vehicle body, a pressure plate for pressing the vehicle door, a vehicle door detection block for detecting the vehicle door, a sealing ring detection pin for detecting the sealing ring, and a face difference table quick correction block.

[0007] Preferably, at least one three-coordinate detection reference hole is provided on each of the four corners of the base surface, and the distribution of the reference surface, reference pin, hinge mounting reference mounting block, hinge reference mounting block and three-coordinate detection reference hole is consistent with the drawing requirements under the standard coordinate system state of the vehicle body.

[0008] Preferably, the reference pin includes a reference pin head and a connecting block installed on the base surface, the connecting block is provided with a reference pin hole, the reference pin head includes a boss on the top, a connecting rod is provided below the boss, the connecting rod passes through the connecting block through the reference pin hole, the lower part of the connecting rod is threadedly connected to a tightening handle with an internal set groove, and a U-shaped adjustment block for adjusting the height of the reference pin head is provided between the boss and the connecting block.

[0009] Preferably, the bottom surface of the hinge mounting reference mounting block is connected to the base surface by bolts, and the vertical surface of the hinge mounting reference mounting block is provided with two first mounting holes. When the hinge mounting reference mounting block is forwardly mounted on the base surface, the first mounting holes are forwardly matched with the door hinge mounting holes; when the hinge mounting reference mounting block is reversely mounted on the base surface, the first mounting holes are reversely matched with the door hinge mounting holes.

[0010] Preferably, the bottom surface of the hinge reference mounting block is connected to the base surface by bolts, and the top of the hinge reference mounting block is provided with two second mounting holes matching the hinge mounting holes of the vehicle body.

[0011] Preferably, the vehicle door detection block includes a fixed vehicle door detection block, a sliding vehicle door detection block and a detachable vehicle door detection block.

[0012] Preferably, the sealing ring detection pin is arranged at the position where the front door assembly presses the vehicle body sealing strip according to measurement requirements.

[0013] Preferably, the flushness table quick correction block is stepped, and the height difference is the thickness of the front door outer panel.

[0014] Preferably, the second mounting hole on the hinge reference mounting block is stepped, the stepped holes are concentric, and one of the holes is a threaded hole.

[0015] A method for testing the front door composite inspection fixture, when testing the front door inner panel, includes the following steps:

[0016] A1: Remove the reference surface corresponding to the front door outer panel and retract the reference pin corresponding to the front door hemming mold to the lowest position to prevent interference between the measured object and the inspection fixture, which may cause inaccurate measurement data.

[0017] B1: Install the corresponding reference pins and reference surfaces of the front door inner panel, install the door detection block and lock it;

[0018] C1: Install the front door inner panel on the inspection fixture and press it lightly with a pressing plate;

[0019] D1: Place the reference end of the facet gauge on the high step of the facet gauge quick correction block, and the facet gauge measuring needle on the low step of the facet gauge quick correction block, and return the facet gauge to 0;

[0020] E1: Use a flush gauge, gap gauge, or caliper to test the gap and flushness. Use a seal ring detection pin to measure the flushness of the front door inner panel where it presses against the body seal. The flush gauge reading is the actual flushness of the front door inner panel. The gap value is the actual gap, which can be compared with the standard.

[0021] F1: To measure the position of the hole at the bottom of the gauge, insert the inner marking pin into the corresponding hole of the gauge so that the burr contacts the inner panel of the front door. Then rotate the inner marking pin to mark a circle on the inner panel. This circle is the theoretical position of the hole to be measured. Compare the circular mark with the hole on the inner panel to confirm the accuracy of the measured circle. To measure the position of the hole at the top of the gauge, insert the outer marking pin into the corresponding hole of the gauge so that the burr contacts the inner panel of the front door. Then rotate the outer marking pin to mark a circle on the single product. This circle is the theoretical position of the hole to be measured. Compare the circular mark with the hole on the inner panel to confirm the accuracy of the measured circle.

[0022] G1: To test the position of the vehicle body seal, gradually rotate the seal ring detection pin until the tip just touches the front door inner panel, then tighten it. After all other tests are completed, remove the front door inner panel and observe the scale value displayed on the seal ring detection pin.

[0023] When testing the front door outer panel, the following steps are included:

[0024] A2: Move the reference pins corresponding to the front door hemming mold, the reference pins corresponding to the front door inner panel, and the reference surface corresponding to the front door inner panel back to the lowest position;

[0025] B2: Install the corresponding reference surface of the front door outer panel, install the door detection block and lock it;

[0026] C2: Install the front door outer panel on the inspection fixture and press it lightly with a pressing plate;

[0027] D2: Adjust the auxiliary support block at the bottom of the front door outer panel until the gap between the front door outer panel and the door detection block is 2.7mm, and adjust the gap between the front door outer panel and the door detection block to be uniform;

[0028] E2: Place the reference end of the fluctuating gauge and the measuring needle on the same step of the fluctuating gauge quick correction block, and return the fluctuating gauge to 0;

[0029] F2: Use a flushness gauge, gap gauge or caliper to detect the gap and flushness. The flushness gauge reading is the actual flushness of the front door outer panel. The gap value is the actual gap, which can be compared with the standard.

[0030] When testing the front door frame, the following steps are included:

[0031] A3: Install the corresponding reference pins on the front door inner panel and the corresponding reference surface on the front door frame, install the door detection block and lock it;

[0032] B3: Install the front door frame on the inspection fixture;

[0033] C3: Place the reference end of the fluctuating gauge and the measuring needle on the same step of the fluctuating gauge quick correction block, and return the fluctuating gauge to 0;

[0034] D3: Use a flushness gauge, gap gauge, or caliper to test the gap and flushness. Use a seal ring detection pin to measure the flushness where the front door inner panel presses against the body seal. The flushness gauge reading is the actual flushness of the front door frame. The gap value is the actual gap, which can be compared with the standard.

[0035] E3: The hole measurement method is the same as F1;

[0036] F3: The detection method of pressing the body sealing strip position is the same as G1;

[0037] When inspecting the front door assembly using a fixture reference, the following steps are included:

[0038] A4: Remove the hinge installation reference blocks corresponding to the rear door and front door and the reference surface corresponding to the front door outer panel, and retract the reference pin corresponding to the front door hemming mold to the lowest position;

[0039] B4: Install the reference pins and reference surfaces corresponding to the front door inner panel, install the door detection block and lock it;

[0040] C4: Install the front door assembly on the inspection fixture and press it lightly with a pressure plate;

[0041] D4: Place the reference end of the fluctuating gauge and the measuring needle on the same step of the fluctuating gauge quick correction block, and return the fluctuating gauge to 0;

[0042] E4: Use a flush gauge, gap gauge, or caliper to test the gap and flushness. Use a seal ring detection pin to measure the flushness where the front door inner panel presses against the body seal strip. The flush gauge reading is the actual flushness of the front door assembly using the fixture as a reference. The gap value is the actual gap, which can be compared with the standard.

[0043] F4: The hole measurement method is the same as F1;

[0044] G4: For the opening accuracy of the door frame after the edge is hemmed, use an opening stop gauge to measure. The opening stop gauge has three steps. The second step width is the median value of the theoretical value of the measured opening, the first step width is the lower limit of the theoretical value of the measured opening, and the third step width is the upper limit of the theoretical value of the measured opening. If the first step of the opening stop gauge cannot be inserted into the opening, the opening is too small. If there is still a gap after the third step is inserted, the opening is too large. If the second step is just inserted into the opening, the opening is close to the middle value.

[0045] H4: The detection method for pressing the body sealing strip position is the same as G1;

[0046] When testing the front door assembly using the mold reference, the following steps are included:

[0047] A5: Remove the hinge mounting blocks corresponding to the rear door and front door and the reference surface corresponding to the front door outer panel, and retract the reference pin corresponding to the front door inner panel reference to the lowest position;

[0048] B5: Install the reference pins corresponding to the front door hemming mold and the reference surface corresponding to the front door inner panel, install the door detection block and lock it;

[0049] C5: Install the front door assembly on the inspection fixture and press it lightly with a pressure plate;

[0050] D5: Place the reference end of the fluctuating gauge and the measuring needle on the same step of the fluctuating gauge quick correction block, and return the fluctuating gauge to 0;

[0051] E5: Use a flush gauge, gap gauge, or caliper to test the gap and flushness. Use a seal ring detection pin to measure the flushness where the front door inner panel presses against the body seal strip. The flush gauge reading is the actual flushness of the front door assembly using the hemming die as a reference. The gap value is the actual gap, which can be compared with the standard.

[0052] F5: The hole measurement method is the same as F1;

[0053] G5: The measurement method of opening accuracy is the same as G4;

[0054] H5: The detection method for pressing the body sealing strip position is the same as G1;

[0055] The impact of the hemming mold on the assembly accuracy can be determined, and countermeasures can be taken against defects caused by the mold to quickly improve accuracy.

[0056] When inspecting the front door assembly using the hinge installation reference, the following steps are included:

[0057] A6: Remove the corresponding reference surfaces of the front door outer panel and the front door inner panel, and retract the corresponding reference pins of the front door inner panel and the front door hemming mold to the lowest position;

[0058] B6: Install the hinge mounting base block corresponding to the front door, install the door detection block and lock it;

[0059] C6: Place the front door assembly on the inspection fixture and support it with auxiliary support blocks. Use the mounting bolts to install the front door on the corresponding hinge mounting reference mounting blocks. After installation, remove the auxiliary support blocks.

[0060] D6: Place the reference end of the fluctuating gauge and the measuring needle on the same step of the fluctuating gauge quick correction block, and return the fluctuating gauge to 0;

[0061] E6: Use a flush gauge, gap gauge, or caliper to test the gap and flushness. Use a seal ring detection pin to measure the flushness where the front door inner panel presses against the body seal. The flush gauge reading is the actual flushness of the front door assembly using the hinge installation reference. The gap value is the actual gap, which can be compared with the standard.

[0062] F6: The hole measurement method is the same as F1;

[0063] G6: The measurement method of opening accuracy is the same as G4;

[0064] H6: The detection method for pressing the body sealing strip position is the same as G1;

[0065] Similarly, install the hinge installation reference mounting block corresponding to the rear door, install the rear door assembly using the hinge installation reference mounting block corresponding to the rear door, and determine the matching clearance and face difference between the front door assembly and the rear door assembly in the standard state;

[0066] When inspecting the front door assembly using the hinge reference, the following steps are included:

[0067] A7: Remove the hinge installation reference blocks corresponding to the front and rear doors, remove the reference surfaces corresponding to the front door outer panel and the front door inner panel, retract the reference pins corresponding to the front door inner panel and the front door hemming mold to the lowest position, and install the hinge reference installation blocks corresponding to the front door;

[0068] B7: Install the door detection block and lock it;

[0069] C7: Install the hinges on the front door assembly, place it on the inspection fixture, and support it with auxiliary support blocks. Use the mounting bolts to install the front door assembly on the hinge mounting reference mounting blocks corresponding to the front door. After installation, remove the auxiliary support blocks.

[0070] D7: Place the reference end of the fluctuating gauge and the measuring needle on the same step of the fluctuating gauge quick correction block, and return the fluctuating gauge to 0;

[0071] E7: Use a flushness gauge, gap gauge, or caliper to check the gap and flushness. Use a seal ring detection pin to measure the flushness where the front door inner panel presses against the body seal strip.

[0072] F7: The hole measurement method is the same as F1;

[0073] G7: The measurement method of opening accuracy is the same as G4;

[0074] H7: The detection method for pressing the body sealing strip position is the same as G1;

[0075] Similarly, install the hinge reference mounting block corresponding to the rear door, install the rear door assembly using the hinge reference mounting block corresponding to the rear door, and determine the matching clearance and face difference between the front door assembly and the rear door assembly in the hinged state;

[0076] Testing the hinges on the front door involves the following steps:

[0077] A8: Install the hinge base mounting block corresponding to the front door in reverse order, and install the hinge base mounting block corresponding to the front door normally;

[0078] B8: Install the hinges on the front door to the corresponding hinge reference mounting blocks;

[0079] C8: Use an external marking detection pin to mark the holes on the front door where the hinge and the front door assembly meet to check the position accuracy;

[0080] D8: The inspection method for the hinges on the rear door is similar to that for the front door.

[0081] The confirmation of the pre-deformation amount of the front door assembly welding includes the following steps:

[0082] A9: Remove the hinge installation reference blocks corresponding to the front and rear doors, remove the reference surfaces corresponding to the front door outer panel and the front door inner panel, retract the reference pin corresponding to the front door hemming mold to the lowest position, and install the hinge reference installation blocks corresponding to the front door;

[0083] B9: Install the door detection block and lock it;

[0084] C9: Install the hinges on the front door assembly, place it on the inspection fixture, and support it with auxiliary support blocks. Use the mounting bolts to install the front door on the corresponding hinge reference mounting blocks. Install the interior components on the front door assembly. After installation, remove the auxiliary support blocks.

[0085] D9: Place the reference end of the fluctuating gauge and the measuring needle on the same step of the fluctuating gauge quick correction block, and return the fluctuating gauge to 0;

[0086] E9: Use a flushness gauge, gap gauge, or caliper to measure the gap and step difference. If the gap is not in the theoretical state required for the finished vehicle, repeat D9 to F9 until the door gap and step difference meet the requirements of the finished vehicle.

[0087] F9: Remove the interior parts from the front door assembly, or remove the front door assembly with the interior parts from the hinges and reinstall the front door assembly without the interior parts on the hinges;

[0088] G9: Measure the gap and step difference between the front door assembly and the inspection fixture. This state is the installation state that the front door assembly needs to reach during welding. This state can ensure that the gap and step difference of the final completed vehicle meet the requirements of delivery to consumers.

[0089] Compared with the prior art, the present invention has the following advantages:

[0090] 1. It can detect multiple parts including front door frame, front door inner panel, front door outer panel, front door inner panel sub-assembly, front door assembly, etc.

[0091] 2. It can simultaneously detect the fixture benchmark, mold benchmark, hinge installation benchmark and hinge benchmark of the front door, and can also detect the engineering process accuracy and the matching accuracy of the front and rear doors under different benchmarks;

[0092] 3. Since the same inspection block is used for the measurement of different single products, sub-assemblies and assemblies, the error of measurement data between different inspection tools is eliminated. At the same time, the number of inspection tools is reduced, the size is small, the use is flexible, and the cost is lower, which greatly improves the speed and efficiency of quality maturation. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] Figure 1 This is a schematic structural diagram of the front door composite inspection fixture of the present invention;

[0094] Figure 2 Schematic diagram of the positioning structure of the front door composite inspection fixture of the present invention;

[0095] Figure 3 for Figure 2 Schematic diagram of the structure of the center hinge installation reference installation block;

[0096] Figure 4 for Figure 2 Schematic diagram of the structure of the middle hinge reference mounting block;

[0097] Figure 5 for Figure 2 Schematic diagram of the structure of the middle reference pin;

[0098] Figure 6 This is a schematic diagram of the state of confirming the matching quality of the front door and back door in the present invention;

[0099] Figure 7 A schematic diagram of the front door assembly detection according to the present invention;

[0100] Figure 8 This is a schematic diagram of the front door frame detection performed by the present invention;

[0101] Figure 9 A schematic diagram of the front door inner panel detection according to the present invention;

[0102] Figure 10 A schematic diagram of the front door outer panel detection according to the present invention;

[0103] Figure 11 A schematic diagram of a hinge installation benchmark detection state according to the present invention;

[0104] Figure 12 This is a schematic diagram of the hinge benchmark detection state of the present invention.

[0105] The components in the figure are numbered as follows:

[0106] Base plate 1, base surface 2, auxiliary support block 3, reference surface 4, reference pin 5, hinge mounting reference mounting block 6, hinge reference mounting block 7, pressure plate 8, vehicle door detection block 9, sealing ring detection pin 10, flushness table quick correction block 11, three-coordinate detection reference hole 12, reference pin head 51, connecting block 52, reference pin hole 53, boss 54, connecting rod 55, tightening handle 56, U-shaped adjustment block 57, first mounting hole 61, second mounting hole 71, front door inner panel 101, front door outer panel 102, front door frame 103, front door assembly 104, rear door assembly 105, hinge 106. DETAILED DESCRIPTION

[0107] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0108] like Figure 1 and Figure 2 As shown, the present invention provides a front door composite inspection fixture, comprising a base plate 1, a vertical base surface 2 being mounted on the base plate 1, a plurality of auxiliary support blocks 3 for supporting the vehicle door being provided at the lower portion of the base surface 2, a plurality of reference surfaces 4 for surface supporting the vehicle door, a reference pin 5 for positioning the interior of the vehicle door and the edging film, a hinge mounting reference mounting block 6 for simulating the hinge mounting hole of the vehicle door, a hinge reference mounting block 7 for simulating the hinge mounting hole of the vehicle body, a pressure plate 8 for pressing the vehicle door, a vehicle door detection block 9 for detecting the vehicle door, a sealing ring detection pin 10 for detecting the sealing ring, and a face difference table quick correction block 11.

[0109] Among them, at least one three-coordinate detection reference hole 12 is provided on each of the four corners of the base surface 2, and the distribution of the reference surface 4, the reference pin 5, the hinge installation reference mounting block 6, the hinge reference mounting block 7 and the three-coordinate detection reference hole 12 is consistent with the drawing requirements under the standard coordinate system state of the vehicle body.

[0110] like Figure 3 As shown, the bottom surface of the hinge mounting reference mounting block 6 is connected to the base surface 2 by bolts, and two first mounting holes 61 are provided on the vertical surface of the hinge mounting reference mounting block 6. When the hinge mounting reference mounting block 6 is mounted on the base surface 2 in the forward direction, the first mounting holes 61 are positively matched with the door hinge mounting holes. When the hinge mounting reference mounting block 6 is mounted on the base surface 2 in the reverse direction, the first mounting holes 61 are reversely matched with the door hinge mounting holes.

[0111] like Figure 4 As shown, the bottom surface of the hinge reference mounting block 7 is connected to the base surface 2 by bolts, and the top of the hinge reference mounting block 7 is provided with two second mounting holes 71 matching the vehicle body hinge mounting holes.

[0112] like Figure 5 As shown, the reference pin 5 includes a reference pin head 51 and a connecting block 52 installed on the base surface 2, a reference pin hole 53 is provided on the connecting block 52, the reference pin head 51 includes a boss 54 on the top, and a connecting rod 55 is provided below the boss 54. The connecting rod 55 passes through the connecting block 52 through the reference pin hole 53, and the lower part of the connecting rod 55 is connected to a tightening handle 56 with an internal set groove through a thread, and a U-shaped adjustment block 57 for adjusting the height of the reference pin head 51 is provided between the boss 54 and the connecting block 52.

[0113] In addition, the door detection block 9 includes a fixed door detection block 9, a sliding door detection block 9 and a detachable door detection block 9. The sealing ring detection pin 10 is arranged at the position where the front door assembly 104 presses the vehicle body sealing strip according to measurement needs. The surface difference table quick correction block 11 is stepped, and the height difference is the thickness of the front door outer panel 102. The second mounting hole 71 on the hinge reference mounting block 7 is stepped, the step holes are concentric, and one of them is a threaded hole.

[0114] In this embodiment, the reference pin 5 can be retracted to the lowest position to avoid interference with the object to be detected.

[0115] When the front door composite inspection tool of this embodiment is used, when inspecting the front door inner panel 101, Figure 9 As shown, the following steps are included:

[0116] A1: Remove the reference surface 4 corresponding to the front door outer panel 102 and retract the reference pin 5 corresponding to the front door hemming mold to the lowest position to prevent inaccurate measurement data from interfering with the measured object and the inspection fixture.

[0117] B1: Install the reference pin 5 and reference surface 4 corresponding to the front door inner panel 101, install the door detection block 9 and lock it;

[0118] C1: Install the front door inner panel 101 on the inspection fixture and press it lightly with the pressing plate 8;

[0119] D1: Place the reference end of the fluting gauge on the high step of the fluting gauge quick correction block 11, and the fluting gauge measuring needle on the low step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0120] E1: Use a flushness gauge, gap gauge, or caliper to test the gap and flushness. Use the seal ring detection pin 10 to measure the flushness of the front door inner panel 101 where it presses against the vehicle body seal strip. The flushness gauge reading is the actual flushness of the front door inner panel 101. The gap value is the actual gap, which can be compared with the standard.

[0121] F1: To measure the position of the lower hole of the gauge, insert the inner marking detection pin into the corresponding hole of the gauge so that the burr contacts the front door inner panel 101. Then rotate the inner marking detection pin to mark a circle on the front door inner panel 101. This circle is the theoretical position of the hole to be measured. Compare the circular mark with the hole in the front door inner panel 101 to confirm the accuracy of the measured circle. To measure the position of the upper hole of the gauge, insert the outer marking detection pin into the corresponding hole of the gauge so that the burr contacts the front door inner panel 101. Then rotate the outer marking detection pin to mark a circle on the single product. This circle is the theoretical position of the hole to be measured. Compare the circular mark with the hole in the front door inner panel 101 to confirm the accuracy of the measured circle.

[0122] G1: To test the position of the vehicle body seal strip, gradually rotate the seal ring detection pin 10 until the tip just touches the front door inner panel 101, then tighten it. After all other tests are completed, remove the front door inner panel 101 and observe the scale value displayed on the seal ring detection pin 10.

[0123] When testing the front door outer panel 102, if Figure 10 As shown, the following steps are included:

[0124] A2: Move the reference pin 5 corresponding to the front door hemming mold, the reference pin 5 corresponding to the front door inner panel 101, and the reference surface 4 corresponding to the front door inner panel 101 back to the lowest position;

[0125] B2: Install the reference surface 4 corresponding to the front door outer panel 102, install the door detection block 9 and lock it;

[0126] C2: Install the front door outer panel 102 on the inspection fixture and press it lightly with the pressing plate 8;

[0127] D2: Adjust the auxiliary support block 3 at the bottom of the front door outer panel 102 until the gap between the front door outer panel 102 and the door detection block 9 is 2.7 mm, and adjust the gap between the front and rear of the front door outer panel 102 and the door detection block 9 to be uniform;

[0128] E2: Place the reference end of the fluting gauge and the measuring needle on the same step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0129] F2: Use a flushness gauge, gap gauge or caliper to detect the gap and flushness. The flushness gauge reading is the actual flushness of the front door outer panel 102. The gap value is the actual gap, which can be compared with the standard.

[0130] When the front door frame 103 is detected, Figure 8 As shown, the following steps are included:

[0131] A3: Install the reference pin 5 corresponding to the front door inner panel 101 and the reference surface 4 corresponding to the front door frame 103, install the door detection block 9 and lock it;

[0132] B3: Install the front door frame 103 on the inspection fixture;

[0133] C3: Place the reference end of the fluting gauge and the measuring needle on the same step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0134] D3: Use a flushness gauge, gap gauge, or caliper to test the gap and flushness. Use the seal ring detection pin 10 to measure the flushness of the front door inner panel 101 where it presses against the vehicle body seal strip. The flushness gauge reading is the actual flushness of the front door frame 103. The gap value is the actual gap, which can be compared with the standard.

[0135] E3: The hole measurement method is the same as F1;

[0136] F3: The detection method of pressing the body sealing strip position is the same as G1;

[0137] When testing the front door assembly 104 using a fixture reference, Figure 7 As shown, the following steps are included:

[0138] A4: Remove the hinge mounting base blocks 6 corresponding to the rear door and front door, and the reference surface 4 corresponding to the front door outer panel 102, and retract the reference pin 5 corresponding to the front door hemming mold to the lowest position;

[0139] B4: Install the reference pin 5 and the reference surface 4 corresponding to the front door inner panel 101, install the door detection block 9 and lock it;

[0140] C4: Install the front door assembly 104 on the inspection fixture and press lightly with the pressing plate 8;

[0141] D4: Place the reference end of the fluting gauge and the measuring needle on the same step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0142] E4: Use a flush gauge, gap gauge, or caliper to test the gap and flushness. Use the seal ring detection pin 10 to measure the flushness of the front door inner panel 101 where it presses against the body seal strip. The flush gauge reading is the actual flushness of the front door assembly 104 using the fixture as a reference. The gap value is the actual gap, which can be compared with the standard.

[0143] F4: The hole measurement method is the same as F1;

[0144] G4: For the opening accuracy of the door frame after the edge is hemmed, use an opening stop gauge to measure. The opening stop gauge has three steps. The second step width is the median value of the theoretical value of the measured opening, the first step width is the lower limit of the theoretical value of the measured opening, and the third step width is the upper limit of the theoretical value of the measured opening. If the first step of the opening stop gauge cannot be inserted into the opening, the opening is too small. If there is still a gap after the third step is inserted, the opening is too large. If the second step is just inserted into the opening, the opening is close to the middle value.

[0145] H4: The detection method for pressing the body sealing strip position is the same as G1;

[0146] When testing the front door assembly 104 using the mold reference, the following steps are included:

[0147] A5: Remove the hinge mounting base blocks 6 corresponding to the rear door and front door, and the reference surface 4 corresponding to the front door outer panel 102, and retract the reference pin 5 corresponding to the front door inner panel 101 to the lowest position;

[0148] B5: Install the reference pin 5 corresponding to the front door hemming mold and the reference surface 4 corresponding to the front door inner panel 101, install the door detection block 9 and lock it;

[0149] C5: Install the front door assembly 104 on the inspection fixture and press lightly with the pressing plate 8;

[0150] D5: Place the reference end of the fluting gauge and the measuring needle on the same step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0151] E5: Use a flush gauge, gap gauge, or caliper to test the gap and flushness. Use the seal ring detection pin 10 to measure the flushness of the front door inner panel 101 where it presses against the body seal strip. The flush gauge reading is the actual flushness of the front door assembly 104 using the hemming die as a reference. The gap value is the actual gap, which can be compared with the standard.

[0152] F5: The hole measurement method is the same as F1;

[0153] G5: The measurement method of opening accuracy is the same as G4;

[0154] H5: The detection method for pressing the body sealing strip position is the same as G1;

[0155] The impact of the hemming mold on the assembly accuracy can be determined, and countermeasures can be taken against defects caused by the mold to quickly improve accuracy.

[0156] When testing the front door assembly 104 using the hinge installation reference, Figure 11 As shown, the following steps are included:

[0157] A6: Remove the reference surface 4 corresponding to the front door outer panel 102 and the front door inner panel 101, and retract the reference pins 5 corresponding to the front door inner panel 101 and the front door hemming mold to the lowest position;

[0158] B6: Install the hinge mounting base mounting block 6 corresponding to the front door, install the door detection block 9 and lock it;

[0159] C6: Place the front door assembly 104 on the inspection fixture and support it with the auxiliary support block 3. Use the mounting bolts to install the front door on the hinge mounting reference mounting block 6 corresponding to the front door. After the installation is completed, remove the auxiliary support block 3.

[0160] D6: Place the reference end of the fluting gauge and the measuring needle on the same step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0161] E6: Use a flush gauge, gap gauge, or caliper to test the gap and flushness. Use the seal ring detection pin 10 to measure the flushness where the front door inner panel 101 presses against the vehicle body seal strip. The flush gauge reading is the actual flushness of the front door assembly 104 using the hinge installation reference. The gap value is the actual gap, which can be compared with the standard.

[0162] F6: The hole measurement method is the same as F1;

[0163] G6: The measurement method of opening accuracy is the same as G4;

[0164] H6: The detection method for pressing the body sealing strip position is the same as G1;

[0165] Similarly, install the hinge installation reference mounting block 6 corresponding to the rear door, install the rear door assembly 105 using the hinge installation reference mounting block 6 corresponding to the rear door, and determine the matching clearance and face difference between the front door assembly 104 and the rear door assembly 105 in the standard state;

[0166] When testing the front door assembly 104 using the hinge reference, Figure 12 As shown, the following steps are included:

[0167] A7: Remove the hinge mounting reference blocks 6 corresponding to the front and rear doors, remove the reference surfaces 4 corresponding to the front door outer panel 102 and the front door inner panel 101, retract the reference pins 5 corresponding to the front door inner panel 101 and the front door hemming mold to the lowest position, and install the hinge mounting reference blocks 7 corresponding to the front door.

[0168] B7: Install the door detection block 9 and lock it;

[0169] C7: Install the hinge 106 on the front door assembly 104, place it on the inspection fixture, and support it with the auxiliary support block 3. Use the mounting bolts to install the front door assembly 104 on the hinge mounting reference mounting block 6 corresponding to the front door. After installation, remove the auxiliary support block 3.

[0170] D7: Place the reference end of the fluting gauge and the measuring needle on the same step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0171] E7: Use a flushness gauge, gap gauge, or caliper to perform gap and flushness inspection. Use the seal ring inspection pin 10 to measure the flushness where the front door inner panel 101 presses against the vehicle body seal strip.

[0172] F7: The hole measurement method is the same as F1;

[0173] G7: The measurement method of opening accuracy is the same as G4;

[0174] H7: The detection method for pressing the body sealing strip position is the same as G1;

[0175] Similarly, install the hinge reference mounting block 7 corresponding to the rear door, install the rear door assembly 105 using the hinge reference mounting block 7 corresponding to the rear door, and determine the matching clearance and face difference between the front door assembly 104 and the rear door assembly 105 with the hinge 106 installed.

[0176] When testing the hinge 106 on the front door, the following steps are included:

[0177] A8: Reverse the installation of the hinge base mounting block 6 for the front door and install the hinge base mounting block 7 for the front door normally.

[0178] B8: Install the hinges 106 on the front door to the corresponding hinge reference mounting blocks 7 of the front door;

[0179] C8: Use the external marking detection pin to mark the hole where the hinge 106 on the front door mates with the front door assembly 104 to detect the position accuracy;

[0180] D8: The detection method of the hinge 106 on the rear door is similar to that of the front door;

[0181] When confirming the pre-deformation amount of the front door assembly 104 welding, if Figure 6As shown, the following steps are included:

[0182] A9: Remove the hinge mounting reference blocks 6 corresponding to the front and rear doors, remove the reference surfaces 4 corresponding to the front door outer panel 102 and the front door inner panel 101, retract the reference pins 5 corresponding to the front door hemming mold to the lowest position, and install the hinge mounting reference blocks 7 corresponding to the front door.

[0183] B9: Install the door detection block 9 and lock it;

[0184] C9: Install the hinge 106 on the front door assembly 104, place it on the inspection fixture, and support it with the auxiliary support block 3. Use the mounting bolts to install the front door on the corresponding hinge reference mounting block 7. Install the interior parts on the front door assembly 104. After installation, remove the auxiliary support block 3.

[0185] D9: Place the reference end of the fluting gauge and the measuring needle on the same step of the fluting gauge quick correction block 11, and return the fluting gauge to 0;

[0186] E9: Use a flushness gauge, gap gauge, or caliper to measure the gap and step difference. If the gap is not in the theoretical state required for the finished vehicle, repeat D9 to F9 until the door gap and step difference meet the requirements of the finished vehicle.

[0187] F9: Remove the interior parts from the front door assembly 104, or remove the front door assembly 104 with the interior parts from the hinge 106, and reinstall the front door assembly 104 without the interior parts on the hinge 106;

[0188] G9: Measure the gap and step difference between the front door assembly 104 and the inspection fixture. This state is the installation state that the front door assembly 104 needs to reach during welding. This state can ensure that the gap and step difference of the final completed vehicle meet the requirements of delivery to consumers.

[0189] The front door composite inspection fixture and the inspection method thereof of the present invention can inspect multiple parts such as the front door frame, the front door inner panel, the front door outer panel, the front door inner panel sub-assembly, and the front door assembly; at the same time, it can inspect the fixture datum, mold datum, hinge installation datum and hinge datum of the front door, and can also inspect the engineering process accuracy and the matching accuracy of the front and rear doors under different datums; because the measurement of different single products, sub-assemblies and assemblies uses the same inspection block, the error of the measurement data between different inspection fixtures is eliminated, and the number of inspection fixtures is also reduced, the size is small, the use is flexible, and the cost is lower, which greatly improves the speed and efficiency of quality maturation.

Claims

1. A front door composite inspection fixture, comprising a bottom plate (1), characterized in that: A vertical base surface (2) is mounted on the bottom plate (1), a plurality of auxiliary support blocks (3) for supporting the vehicle door are mounted on the lower portion of the base surface (2), and a plurality of reference surfaces (4) for surface supporting the vehicle door, a reference pin (5) for positioning the interior of the vehicle door and the edge film, a hinge mounting reference mounting block (6) for simulating the hinge mounting hole of the vehicle door, a hinge reference mounting block (7) for simulating the hinge mounting hole of the vehicle body, a pressure plate (8) for pressing the vehicle door, a vehicle door detection block (9) for detecting the vehicle door, a sealing ring detection pin (10) for detecting the sealing ring, and a face difference table quick correction block (11); At least one three-coordinate detection reference hole (12) is provided at each of the four corners of the base surface (2), and the distribution of the reference surface (4), reference pin (5), hinge mounting reference mounting block (6), hinge reference mounting block (7) and three-coordinate detection reference hole (12) is consistent with the drawing requirements under the vehicle body standard coordinate system state; The reference pin (5) comprises a reference pin head (51) and a connecting block (52) mounted on the base surface (2), wherein the connecting block (52) is provided with a reference pin hole (53), the reference pin head (51) comprises a boss (54) at the top, a connecting rod (55) is provided below the boss (54), the connecting rod (55) passes through the connecting block (55) through the reference pin hole (53), the lower part of the connecting rod (55) is connected to a tightening handle (56) with an internal groove through a thread, and a U-shaped adjustment block (57) for adjusting the height of the reference pin head is provided between the boss (54) and the connecting block (55).

2. The front door composite inspection fixture according to claim 1, characterized in that: The bottom surface of the hinge mounting reference mounting block (6) is connected to the base surface (2) by bolts, and the vertical surface of the hinge mounting reference mounting block (6) is provided with two first mounting holes (61). When the hinge mounting reference mounting block (6) is mounted on the base surface (2) in the forward direction, the first mounting holes (61) are matched with the door hinge mounting holes in the forward direction; when the hinge mounting reference mounting block (6) is mounted on the base surface in the reverse direction, the first mounting holes (61) are matched with the door hinge mounting holes in the reverse direction.

3. The front door composite inspection fixture according to claim 1, characterized in that: The bottom surface of the hinge reference mounting block (7) is connected to the base surface (2) via bolts, and the top of the hinge reference mounting block (7) is provided with two second mounting holes (72) that match the hinge mounting holes of the vehicle body.

4. The front door composite inspection fixture according to claim 1, characterized in that: The vehicle door detection block (9) comprises a fixed vehicle door detection block, a sliding vehicle door detection block and a detachable vehicle door detection block.

5. The front door composite inspection fixture according to claim 1, characterized in that: The sealing ring detection pin (10) is arranged at a position where the front door assembly presses the vehicle body sealing strip according to measurement requirements.

6. The front door composite inspection fixture according to claim 1, characterized in that: The face difference gauge quick correction block (11) is in a stepped shape, and the height difference is the thickness of the front door outer panel.

7. The front door composite inspection fixture according to claim 5, characterized in that: The second mounting hole (72) on the hinge reference mounting block (7) is in a step-like shape, the step holes are concentric, and one of the holes is a threaded hole.

8. A method for detecting a front door composite inspection fixture according to any one of claims 1 to 7, characterized in that: When testing the front door inner panel (101), the following steps are included: A1: Remove the reference surface (4) corresponding to the front door outer panel (102), and retract the reference pin (5) corresponding to the front door hemming mold to the lowest position to prevent the interference between the measured object and the inspection fixture, which may cause inaccurate measurement data; B1: Install the reference pin (5) and reference surface (4) corresponding to the front door inner panel (101), install the door detection block (9) and lock it; C1: Install the front door inner panel (101) on the inspection fixture and press it lightly with the pressing plate (8); D1: Place the reference end of the face difference meter on the high step of the face difference meter quick correction block (11), and the face difference meter measuring needle on the low step of the face difference meter quick correction block (11), and return the face difference meter to 0; E1: Use a flushness gauge, a gap gauge or a caliper to detect the gap and flushness. Use a sealing ring detection pin (10) to measure the flushness of the front door inner panel (101) pressing the body sealing strip. The reading of the flushness gauge is the actual flushness of the front door inner panel (101). The gap value is the actual gap, which can be compared with the standard. F1: For the measurement of the hole position at the bottom of the gauge, insert the inner marking detection pin into the corresponding hole of the gauge so that the burr contacts the front door inner plate (101), then rotate the inner marking detection pin to mark a circle on the front door inner plate (101). This circle is the theoretical position of the hole to be measured. The circle mark is compared with the hole of the front door inner plate (101) to confirm the accuracy of the measured circle. For the measurement of the hole position at the top of the gauge, insert the outer marking detection pin into the corresponding hole of the gauge so that the burr contacts the front door inner plate (101), then rotate the outer marking detection pin to mark a circle on the single product. This circle is the theoretical position of the hole to be measured. The circle mark is compared with the hole of the front door inner plate (101) to confirm the accuracy of the measured circle. G1: The method for testing the position of the vehicle body sealing strip is to gradually rotate the sealing ring detection pin (10) so that the top end just contacts the front door inner panel (101), lock it, and after all other tests are completed, remove the front door inner panel (101), and then observe the scale value displayed on the sealing ring detection pin (10); When testing the front door outer panel (102), the following steps are included: A2: Retract the reference pin (5) corresponding to the front door hemming mold, the reference pin (5) corresponding to the front door inner plate (101), and the reference surface (4) corresponding to the front door inner plate (101) to the lowest position; B2: Install the reference surface (4) corresponding to the front door outer panel (102), install the door detection block (9) and lock it; C2: Install the front door outer panel (102) on the inspection fixture and press it lightly with the pressing plate (8); D2: Adjust the auxiliary support block (3) at the bottom of the front door outer panel (102) to a clearance of 2.7 mm between the front door outer panel (102) and the door detection block (9), and adjust the clearance between the front and rear of the front door outer panel (102) and the door detection block (9) to be uniform; E2: Place the reference end of the face difference gauge and the measuring needle on the same step of the face difference gauge quick correction block (11), and return the face difference gauge to 0; F2: Use a flushness gauge, a gap gauge or a caliper to detect the gap and flushness. The reading of the flushness gauge is the actual flushness of the front door outer panel (102). The gap value is the actual gap, which can be compared with the standard. When testing the front door frame (103), the following steps are included: A3: Install the reference pin (5) corresponding to the front door inner panel (101) and the reference surface (4) corresponding to the front door frame (103), install the door detection block (9) and lock it; B3: Install the front door frame (103) on the inspection fixture; C3: Place the reference end of the face difference gauge and the measuring needle on the same step of the face difference gauge quick correction block (11), and return the face difference gauge to 0; D3: Use a flushness gauge, a gap gauge or a caliper to detect the gap and flushness. Use the sealing ring detection pin (10) to measure the flushness of the front door inner panel (101) pressing the body sealing strip. The reading of the flushness gauge is the actual flushness of the front door frame (103). The gap value is the actual gap, which can be compared with the standard. E3: The hole measurement method is the same as F1; F3: The detection method of pressing the body sealing strip position is the same as G1; When the front door assembly (104) is inspected using a fixture reference, the following steps are included: A4: Remove the mounting base blocks (6) of the hinges (106) corresponding to the rear door and the front door and the reference surface (4) corresponding to the front door outer panel (102), and retract the reference pin (5) corresponding to the front door hemming mold to the lowest position; B4: Install the reference pin (5) corresponding to the front door inner panel (101) and the reference surface (4) corresponding to the front door inner panel (101), install the door detection block (9) and lock it; C4: Install the front door assembly (104) on the inspection fixture and press it lightly with the pressure plate (8); D4: Place the reference end of the face difference gauge and the measuring needle on the same step of the face difference gauge quick correction block (11), and return the face difference gauge to 0; E4: Use a flush gauge, gap gauge or caliper to detect the gap and flushness. Use the sealing ring detection pin (10) to measure the flushness of the front door inner panel (101) pressing the body sealing strip. The flushness gauge reading is the actual flushness of the front door assembly (104) using the fixture reference. The gap value is the actual gap, which can be compared with the standard. F4: The hole measurement method is the same as F1; G4: For the opening accuracy of the door frame after the edge is hemmed, use an opening stop gauge to measure. The opening stop gauge has three steps. The second step width is the median value of the theoretical value of the measured opening, the first step width is the lower limit of the theoretical value of the measured opening, and the third step width is the upper limit of the theoretical value of the measured opening. If the first step of the opening stop gauge cannot be inserted into the opening, the opening is too small. If there is still a gap after the third step is inserted, the opening is too large. If the second step is just inserted into the opening, the opening is close to the middle value. H4: The detection method for pressing the body sealing strip position is the same as G1; When testing the front door assembly (104) using the mold reference, the following steps are included: A5: Remove the hinge mounting base mounting blocks (6) corresponding to the rear door and the front door and the base surface (4) corresponding to the front door outer panel (102), and retract the base pin (5) corresponding to the front door inner panel (101) to the lowest position; B5: Install the reference pin (5) corresponding to the front door hemming mold and the reference surface (4) corresponding to the front door inner panel (101), install the door detection block (9) and lock it; C5: Install the front door assembly (104) on the inspection fixture and press it lightly with the pressure plate (8); D5: Place the reference end of the face difference gauge and the measuring needle on the same step of the face difference gauge quick correction block (11), and return the face difference gauge to 0; E5: Use a flush gauge, a gap gauge or a caliper to detect the gap and flushness. Use the sealing ring detection pin (10) to measure the flushness of the front door inner panel (101) pressing the body sealing strip. The flushness gauge reading is the actual flushness of the front door assembly (104) using the hemming die as the reference. The gap value is the actual gap, which can be compared with the standard. F5: The hole measurement method is the same as F1; G5: The measurement method of opening accuracy is the same as G4; H5: The detection method for pressing the body sealing strip position is the same as G1; It can determine the impact of the hemming mold on the accuracy of the assembly, take countermeasures against defects caused by the mold, and quickly improve the accuracy; When testing the front door assembly (104) using the hinge installation reference, the following steps are included: A6: Remove the reference surfaces (4) corresponding to the front door outer panel (102) and the front door inner panel (101), and retract the reference pins (5) corresponding to the front door inner panel (101) and the front door hemming mold to the lowest position; B6: Install the hinge mounting base mounting block (6) corresponding to the front door, install the door detection block (9) and lock it; C6: Place the front door assembly (104) on the inspection fixture and support it with the auxiliary support block (3). Use the mounting bolts to install the front door on the hinge mounting reference mounting block (6) corresponding to the front door. After the installation is completed, remove the auxiliary support block (3); D6: Place the reference end of the face difference gauge and the measuring needle on the same step of the face difference gauge quick correction block (11), and return the face difference gauge to 0; E6: Use a flush gauge, a gap gauge or a caliper to detect the gap and flushness. Use the sealing ring detection pin (10) to measure the flushness of the front door inner panel (101) pressing the body sealing strip. The flushness gauge reading is the actual flushness of the front door assembly (104) using the hinge installation reference. The gap value is the actual gap, which can be compared with the standard. F6: The hole measurement method is the same as F1; G6: The measurement method of opening accuracy is the same as G4; H6: The detection method for pressing the body sealing strip position is the same as G1; Similarly, the hinge installation reference installation block (6) corresponding to the rear door is installed, and the rear door assembly (105) is installed using the hinge installation reference installation block (6) corresponding to the rear door, and the matching clearance and face difference between the front door assembly (104) and the rear door assembly (105) under the standard state are determined; When the hinge reference is used to detect the front door assembly (104), the following steps are included: A7: Remove the hinge mounting reference mounting blocks (6) corresponding to the front door and rear door, remove the reference surfaces (4) corresponding to the front door outer panel (102) and the front door inner panel (101), retract the reference pins (5) corresponding to the front door inner panel (101) and the front door hemming mold to the lowest position, and install the hinge reference mounting blocks (7) corresponding to the front door; B7: Install the door detection block (9) and lock it; C7: Install the hinge (106) of the front door assembly (104), place it on the inspection fixture, and support it with the auxiliary support block (3). Use the mounting bolts to install the front door assembly (104) on the hinge installation reference mounting block (6) corresponding to the front door. After the installation is completed, remove the auxiliary support block (3); D7: Place the reference end of the face difference gauge and the measuring needle on the same step of the face difference gauge quick correction block (11), and return the face difference gauge to 0; E7: Use a flushness gauge, gap gauge or caliper to detect the gap and flushness, and use the sealing ring detection pin (10) to measure the flushness of the front door inner panel (101) pressing the body sealing strip; F7: The hole measurement method is the same as F1; G7: The measurement method of opening accuracy is the same as G4; H7: The detection method for pressing the body sealing strip position is the same as G1; Similarly, the hinge reference mounting block (7) corresponding to the rear door is installed, and the rear door assembly (105) is installed using the hinge reference mounting block (7) corresponding to the rear door, and the matching clearance and face difference between the front door assembly (104) and the rear door assembly (105) in the state where the hinge (106) is installed are determined; When testing the hinge (106) on the front door, the following steps are included: A8: Install the hinge installation reference mounting block (6) corresponding to the front door in reverse, and install the hinge installation reference mounting block (7) corresponding to the front door normally; B8: Install the hinges (106) on the front door to the corresponding hinge reference mounting blocks (7) of the front door; C8: Use an external marking detection pin to mark the hole where the hinge (106) on the front door and the front door assembly (104) match to detect the position accuracy; D8: The hinge (106) on the rear door is tested in the same manner as the front door; When confirming the pre-deformation amount of the front door assembly (104) during welding, the following steps are included: A9: Remove the hinge mounting reference mounting blocks (6) corresponding to the front door and the rear door, remove the reference surfaces (4) corresponding to the front door outer panel (102) and the front door inner panel (101), retract the reference pin (5) corresponding to the front door hemming mold to the lowest position, and install the hinge reference mounting blocks (7) corresponding to the front door; B9: Install the door detection block (9) and lock it; C9: Install the hinge (106) of the front door assembly (104), place it on the inspection fixture, and support it with the auxiliary support block (3). Use the mounting bolts to install the front door on the hinge reference mounting block (7) corresponding to the front door. The front door assembly (104) is installed with interior parts. After the installation is completed, remove the auxiliary support block (3); D9: Place the reference end of the face difference gauge and the measuring needle on the same step of the face difference gauge quick correction block (11), and return the face difference gauge to 0; E9: Use a flushness gauge, gap gauge, or caliper to measure the gap and step difference. If the gap is not in the theoretical state required for the finished vehicle, repeat D9 to F9 until the door gap and step difference meet the requirements of the finished vehicle. F9: Remove the interior parts from the front door assembly (104), or remove the front door assembly (104) with the interior parts from the hinge (106), and reinstall the front door assembly (104) without the interior parts on the hinge (106); G9: Measure the gap and step difference between the front door assembly (104) and the inspection fixture. This state is the installation state that the front door assembly (104) needs to reach during welding. This state can ensure that the gap and step difference of the final completed vehicle meet the requirements of the delivered consumer.

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