A detection method for a fender part

Abstract

The present invention discloses a detection method for fender parts, which relates to the technical field of automotive part inspection fixtures and is mainly used to solve the problems that the traditional method of positioning with the positioning holes on the flange surface of the fender cannot detect the differences in the fender surface on the inspection fixture, and the error is relatively large after the stress release and springback of the fender surface. Its main steps include: S1: Open CH holes on the A surface of the fender part; S2: Position through the CH holes and the A surface positioning surface, and use the fender contour detection plate and pins on the inspection fixture to check the positioning surface of the flange surface, the positioning holes, and the gaps of the assembly holes and assembly surfaces overlapping with other parts; S3: If the detection is unqualified, the fender part is returned for adjustment and S2 is repeated, or it is remanufactured and returned to S1; if the detection is qualified, proceed to S4; S4: Position through the positioning holes on the flange surface of the fender part and the flange positioning surface, and use the fender contour detection and pins on the inspection fixture to check the gaps of each assembly hole and surface; S5: If the detection is unqualified, return to S2, and if it is qualified, the detection ends.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive part inspection fixtures, and more particularly, to a method for inspecting fender parts. Background Art

[0002] CH is the abbreviation of the English "check hole", and its Chinese name is the process hole for die research. The CH hole technology determines the deviation of the die surface in each process relative to the workpiece through a unified reference hole; during die research and debugging, this reference hole is used for positioning to check the reasons for poor workpiece accuracy, so as to reduce the amount of research. Avoid the phenomenon of "drift" between the die surface and the working edge due to improper research, which affects the subsequent processing accuracy.

[0003] In the existing automotive die industry, before the die is delivered, it is first necessary to check whether the stamped parts meet the inspection fixtures. After the stamped parts are packed and returned to the automobile factory, it is also necessary to weld and assemble each stamped part into a vehicle and check the appearance and assembly effect of the entire vehicle model. The fender part is an irregular part and an important appearance part of the automobile. At the same time, it needs to be smoothly matched after being assembled with the side wall, the outer panel of the engine hood, the front bumper, and the outer panel of the front door. Since the fender is placed in the stamping direction on the die and in the body direction on the inspection fixture, the influence of gravity is inconsistent between the two. When the fender part is removed from the die, due to the release of the material stress of the irregular part, it will cause springback deformation of the flange surface (including hole positions) of the fender. Although the inspection fixture surface and the stamping die surface are both machined according to the mathematical model of the fender, the inspection fixture can hold and judge the contour and hole positions of the fender part. However, the springback amount of the flange surface on the four sides of the fender placed in the body direction will cause a slight difference in the fender surface. Using the traditional detection system of the inspection fixture, that is, using the positioning holes on the flange surface of the fender for positioning and placing the flange surface with springback amount on the reference surface and positioning holes will inevitably cause a change in the trend of the fender surface. This change amount is not easy to judge on the inspection fixture. Moreover, the flange surface is the welding and assembly surface of the fender, and its springback amount will amplify the difference amount at the distal end of the fender surface after welding. However, this difference amount will be found when matching with the side wall, the outer panel of the engine hood or the front bumper during the assembly of the components of the whole vehicle. It is quite difficult to judge whether the appearance surface of the fender needs to be rectified and how to rectify it on the die based on the differences exposed during the assembly of the components of the whole vehicle, which delays the progress and effect of the component assembly. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for inspecting fender parts, so as to solve the problem that when using the holes and surfaces on the flange surface of the fender as the reference positioning holes and positioning surfaces in the traditional fender, it is impossible to directly check the unqualified area and measure the deviation value of the unqualified area with an inspection fixture when the accuracy of the flange surface of the fender is unqualified.

[0005] To achieve the object of the present invention, the technical solution adopted is: a method for detecting a fender part, characterized by comprising the following steps:

[0006] S1: Open a CH hole on the A surface of the fender part;

[0007] S2: Position through the CH hole and the A surface positioning surface, and use a fender profile detection plate and a plug on the fixture to check the flange surface positioning surface, positioning holes, and the gaps of the assembly holes and assembly surfaces overlapping with other parts;

[0008] S3: If the detection is unqualified, the fender part returns for adjustment and repeats S2, or returns to S1 for re-production; if the detection is qualified, enter S4;

[0009] S4: Position through the flange surface positioning holes and the flange positioning surface of the fender part, and use a fender profile detection plate and a plug on the fixture to check the gaps of each assembly hole and surface;

[0010] S5: If the detection is unqualified, return to S2, and if it is qualified, the detection ends.

[0011] Further, the S2 includes the following steps,

[0012] S2.1: Place the fender part on the fixture;

[0013] S2.2: Insert a CH hole plug into the CH hole to position the part;

[0014] S2.3: Use the pressing head on the fixture to press the fender part and the A surface positioning surface;

[0015] S2.4: Use a plug with a hole diameter to check the gaps between the positioning holes and other assembly holes on the flange surface;

[0016] S2.5: Close the fender profile detection plate and check the gaps between the flange positioning surface and each assembly surface.

[0017] Further, the S4 includes the following steps:

[0018] S4.1: Remove the fender profile detection plate;

[0019] S4.2: Insert a positioning pin into the flange surface positioning hole of the fender part and press the corresponding pressing head of the flange surface positioning surface;

[0020] S4.3: Remove the pressing head of the A surface positioning surface and remove the CH hole plug.

[0021] S4.4: Use a plug with a hole diameter to check the gaps of each assembly hole;

[0022] S4.5: Take out all the plugs with hole diameters and only keep the positioning pin;

[0023] S4.6: Close the fender contour detection plate and check the gap of the reference plane.

[0024] Furthermore, in S1, the CH hole is opened near the wheel edge of the fender part.

[0025] Furthermore, in S2.4, the distance between the positioning surface of the fender contour detection plate and the fender part is 0 mm.

[0026] Furthermore, in S2.4, the distance between the detection surface of the fender contour detection plate and the fender part is 3 mm.

[0027] The beneficial effects of the present invention are:

[0028] Generally, after the fender stamping die is completed, the die supplier needs to provide the fender stamping parts, pack them and transport them back to the automobile factory for component loading to check the overall vehicle matching and appearance coordination; the die supplier also needs to wait for the return of the component loading information of the stamping parts before making rectifications. A detection method for a fender part of the present invention, based on the traditional fender part detection method (i.e., positioning with the positioning holes on the flange surface of the fender), adds CH hole positioning detection in the previous process. The CH hole is set on the A surface of the fender part. Compared with placing the reference plane and positioning holes on the flange surface with springback, it can check and judge the springback amount of the flanging and shaping surface of the corresponding fender stamping die, and then adjust the flanging and shaping surface and flanging gap of the flanging and shaping die, so that the part flange surface of the re-stamped fender meets the requirements of the inspection fixture. After the CH hole positioning detection is qualified, it is replaced with the traditional detection system. The re-rectified fender is placed on the inspection fixture, and pins are inserted into the positioning holes on the flange surface. The fender contour detection block is closed, and it is rechecked that each detection point of the fender part is consistent with each detection point of the inspection fixture, improving the processing efficiency of the fender springback problem and reducing the workload and cycle of die rectification. Description of the Drawings

[0029] Figure 1 : Schematic flow chart of the traditional detection method;

[0030] Figure 2 : Plan view of the fender in the traditional detection method (inserting the positioning pin and the hole diameter pin);

[0031] Figure 3 : Side view of the fender in the traditional detection method (inserting the positioning pin and the hole diameter pin);

[0032] Figure 4 : Plan view of the fender in the traditional detection method (closing the fender contour detection plate);

[0033] Figure 5 : Schematic flow chart of the detection method of the present invention;

[0034] Figure 6: Schematic diagram of the specific implementation steps of the detection process of the present invention;

[0035] Figure 7 : Schematic diagram of the fender plane when detecting the present invention (inserting the CH hole pin and the pressing head pressing the part);

[0036] Figure 8 : Side view of the fender when detecting the present invention (inserting the CH hole pin and the pressing head pressing the part);

[0037] Figure 9 : Cross-sectional view of the section where the CH hole pin is inserted during the detection of the present invention;

[0038] Figure 10 : Cross-sectional view of the section where the pressing head presses the part during the detection of the present invention.

[0039] Marks in the attached drawings and corresponding names of parts:

[0040] 1 - Fender part, 2 - CH hole die sleeve, 3 - CH hole pin, 4 - Pressing head, 5 - Support block surface of the inspection tool surface, 6 - Fender contour detection plate, 7 - Pin hole, 8 - Positioning pin, 9 - Base, 10 - Vertical plate, 11 - Hole diameter pin; 12 - Flange surface of the fender part. Specific implementation manner

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the directions or position relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or position relationships shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the", and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0045] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to a determination". In addition, the terms "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0046] Figures 1 to 4 Shown is a traditional method for fender detection. The traditional inspection tool includes a positioning pin 8, a base 9, a vertical plate 10, a hole diameter pin 11, a pressing head 4, and a fender contour detection plate 6. The vertical plate 10 is vertically arranged on the base 9. A positioning surface is provided on the vertical plate 10. The pressing position of the pressing head 4 corresponds to the flange surface positioning surface, which is a vertical inspection tool. When detecting, the fender part 1 is placed on the inspection tool, simulating the state of the fender part 1 placed on the vehicle body. A pin hole 7 is provided on the fender mounting surface. The hole diameter pin 11 has multiple diameters. The detection steps include:

[0047] S1: Place the fender part 1 on the positioning surface provided on the vertical plate 10 of the inspection tool, insert the positioning pin 8 into the pin hole 7, and press the flange surface positioning surface against the corresponding pressing head 4;

[0048] S2: Use the hole diameter pin 11 to check the clearance of each assembly hole;

[0049] S3: Close the fender contour detection plate 6 and check the clearance;

[0050] S4: If the detection is unqualified, the fender part 1 returns for adjustment or re - production and returns to S1. If the detection is qualified, the detection ends.

[0051] The fender flange surfaces are obtained after being flanged and shaped by a mold, and the hole positions on the flange surfaces are also obtained by punching after the mold presses the parts. The traditional detection method for fender parts is to place the fender parts on a fixture. The positioning is to select the 0mm clearance surface on the fender flange surface as the reference surface, and insert positioning pins into the holes on this surface as positioning holes. The remaining 3mm clearance surface is the clearance detection surface, and aperture pins are inserted into the holes on it; the fender contour is closed with the fender contour detection plate, so that there is a 3mm detection clearance between the fender contour detection plate and the fender. The positioning pin 8 passes through the positioning hole on the fender part 1 and inserts into the pin hole 7 to position the fender part 1; the mounting holes on the fender part 1 are used to connect with other parts during assembly, and there are various hole diameters. The aperture pin 11 is inserted to detect whether the aperture of the mounting hole is qualified.

[0052] The positioning method of the flange edge positioning hole and the positioning surface on the fixture is to simulate the state of the parts during the vehicle installation process, which is a necessary step. However, this method can only judge whether the parts are qualified and cannot accurately judge the reasons for unqualified parts and find solutions.

[0053] When the distance between the fixture surface and the fender part is 3mm and the distance between the positioning surface and the fender part is 0mm, the part is qualified and no springback occurs. If the distance between the fixture surface and the fender part is less than 3mm, the distance between the positioning surface and the fender part is 0mm and they are tightly attached, negative springback occurs to the part; if the distance between the fixture surface and the fender part is greater than 3mm and the distance between the positioning surface and the fender part is greater than 0mm, positive springback occurs to the part. Since the positioning holes are set on the flange surface, the flange surface itself will also produce springback, that is, the reference itself produces springback deformation. The debugging can only continuously adjust the mold to re-press the parts. The greater the deviation between the stamping direction and the actual vehicle body direction, the greater the number of debugging times. Usually, in production, the deviation value between the stamping direction and the actual vehicle body direction is close to 90°, and the number of debugging times is more than 6 times, which is time-consuming and laborious, with low processing efficiency, large workload and long working cycle. Embodiment

[0054] Figure 5 As shown, a detection method for a fender part provided by the present invention is characterized by including the following steps:

[0055] S1: Open CH holes on the 1A surface of the fender part;

[0056] S2: Position through the CH holes and the A surface positioning surface, and use the fender contour detection plate 6 and the aperture pin 11 on the fixture to check the flange surface positioning surface, the positioning hole and the gaps of the assembly holes and the assembly surface that overlap with other parts;

[0057] S3: If the detection is unqualified, the fender part 1 returns for adjustment and repeats S2, or returns to S1 for re-production; if the detection is qualified, enter S4;

[0058] S4: Position and locate through the positioning holes and the positioning profile on the flange surface of the fender part 1, and use the fender contour inspection plate 6 and the hole diameter plug 11 on the checking fixture to check the gaps of each assembly hole and surface;

[0059] S5: If the inspection is unqualified, return to S2; if qualified, the inspection ends.

[0060] The automotive Class A surface, also known as the Class A surface in common terms, was first proposed by Dassault Systemes, the developer of the CATIA software. It mainly refers to the surfaces with extremely high requirements for appearance and shape in body parts, such as the outer shape surface, the surface of the instrument panel, and the interior trim parts. In the entire automotive development process, there is an engineering stage called Class A Engineering, which focuses on ensuring that the surface quality meets the requirements of the A surface. Therefore, in automotive technology, the A surface refers to the surface data of the visually visible surface with a position deviation of less than 0.005 mm (some automotive factories even require up to 0.001 mm), a tangency change of less than 0.016 degrees, and a curvature change of less than 0.05, meeting the overall aesthetic requirements of the product and the requirements of performance manufacturing, assembly, and die technology.

[0061] Compared with the positioning of the flange edge positioning holes and the positioning profile, the positioning with the CH hole and the A surface positioning surface has a gentle profile and good stiffness, and there is basically no springback. Positioning with the CH hole and the A surface positioning surface has a stable positioning reference and does not undergo springback deformation, which can better check and judge the springback amount of the flanging and shaping surface of the corresponding stamping die of the fender, and then make targeted adjustments to the flanging and shaping surface and the flanging gap of the flanging and shaping die. Usually, the number of adjustments does not exceed two times, greatly improving the processing efficiency of the fender springback problem and reducing the workload and cycle of die rectification. Embodiment

[0062] Figure 5 As shown, a detection method for a fender part provided by the present invention is characterized by including the following steps:

[0063] S1: Open a CH hole on the fender part 1 near the wheel edge;

[0064] S2: Through the positioning of the CH hole, use the fender contour inspection plate on the checking fixture to check the gap of the reference surface;

[0065] S3: If the inspection is unqualified, the fender part 1 returns for adjustment and repeats S2, or returns to S1 for re-production; if qualified, enter S4;

[0066] S4: Through the positioning of the positioning holes on the flange surface of the fender part 1, use the fender contour inspection plate 6 on the checking fixture to check the gap of the reference surface;

[0067] S5: If the inspection is unqualified, return to S2; if it is qualified, the inspection ends.

[0068] The CH hole is opened on the near-wheel edge of the fender part. Compared with other positions on the A surface, the part thickness at this position is larger, more stable, and less likely to rebound and deform. Embodiment

[0069] Figures 6 to 10 The following shows a detection method for a fender part provided by the present invention, including the following steps:

[0070] S1: Open a CH hole on the 1A surface of the fender part;

[0071] S2: Place the part on the inspection fixture;

[0072] S3: Insert the CH hole pin 3 into the CH hole to position the part;

[0073] S4: Use the pressing head 4 on the inspection fixture to press the fender part 1 and the A surface positioning surface;

[0074] S5: Use the hole diameter pin 11 to check the clearance between the positioning hole and other assembly holes on the flange surface

[0075] S6: Close the fender contour inspection plate 6 to check the reference surface clearance;

[0076] S7: For the fender part 1 with the deviation value within the qualified range, remove the fender contour inspection plate 6;

[0077] S8: Insert the positioning pin 8 into the positioning hole on the flange surface of the fender part 1, and press the corresponding pressing head 4 of the flange surface positioning surface;

[0078] S9: Remove the pressing head 4 of the A surface positioning surface and remove the CH hole pin;

[0079] S10: Use the hole diameter pin 11 to check the clearance of each assembly hole;

[0080] S11: Remove all the hole diameter pins 11 and only keep the positioning pin 8;

[0081] S11: Close the fender contour inspection plate to check the reference surface clearance.

[0082] S12: For unqualified parts, repeat S1 to S4.

[0083] The CH-hole female die sleeve 2, CH-hole pin 3, gauge surface support block surface 5, and the pressing head 4 corresponding to the position of the surface of the support block 5 are added. The CH-hole female die sleeve 2 is arranged under the A-surface area of the fender and corresponds to the position of the CH hole; due to the change in the position of the positioning hole, in order to better press the fender part, the pressing position of the corresponding pressing head 4 changes, and a surface of the support block 5 is arranged at the corresponding pressing position to cooperate with the pressing head 4. Under each pressing head 4, there is a corresponding reference clamping surface; when using the CH hole for positioning, only the pressing head 4 corresponding to the A-surface reference surface is pressed; when using the positioning hole on the flange surface, the pressing head 4 of the reference surface related to the requirements is pressed. Embodiment

[0084] Figures 6 to 10 The following shows a detection method for a fender part provided by the present invention, including the following steps:

[0085] S1: Open a CH hole on the edge near the wheel of the fender part 1;

[0086] S2: Place the part on the gauge;

[0087] S3: Insert the CH-hole pin 11 into the CH hole to position the part;

[0088] S4: Use the pressing head 4 on the gauge to press the fender part 1 and the A-surface positioning surface;

[0089] S5: Use the hole diameter pin 11 to check the clearance between the positioning hole on the flange surface and other assembly holes

[0090] S6: Close the fender contour detection plate 6 to check the clearance of the reference surface;

[0091] S7: For the fender part 1 with the deviation value exceeding the qualified range, remove the CH-hole pin 3 from the CH-hole female die sleeve, move the fender contour detection plate 6, adjust the die, re-press the part and repeat S1 to S5 until the detection is qualified, and then continue with S8;

[0092] S8: Move the fender contour detection plate 6;

[0093] S9: Insert the positioning pin 8 into the positioning hole on the flange surface of the fender part 1 and press the pressing head 4 corresponding to the flange surface positioning surface;

[0094] S10: Move the pressing head 4 of the A-surface positioning surface and remove the CH-hole pin;

[0095] S11: Use the hole diameter pin 11 to check the clearance of each assembly hole;

[0096] S12: Take out all the hole diameter pins 11 and only keep the positioning pin 8;

[0097] S12: Close the fender contour detection plate 6 and check the datum plane clearance.

[0098] S13: Repeat S1 to S4 for unqualified parts.

[0099] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A detection method for a fender part, characterized in that, It includes the following steps: S1: Open a CH hole on the A surface of the fender part (1); S2: Position through the CH hole and the A surface positioning surface, and use the fender contour detection plate (6) and the hole diameter pin (11) on the checking fixture to check the flange surface positioning profile, positioning holes, and the assembly hole and assembly surface clearances for lapping with other parts; S3: If the detection is unqualified, the fender part (1) returns for adjustment and repeats S2, or returns to S1 for re-production; if the detection is qualified, proceed to S4; S4: Position through the flange surface positioning holes and the flange positioning profile of the fender part, and use the fender contour detection plate (6) and the hole diameter pin (11) on the checking fixture to check the clearances of each assembly hole and surface; S5: If the detection is unqualified, return to S2, and if it is qualified, the detection ends.

2. The inspection method of a fender part according to claim 1, characterized in that, S2 includes the following steps: S2.1: Place the fender part (1) on the checking fixture; S2.2: Insert the CH hole pin (3) into the CH hole to position the part; S2.3: Use the pressing head (4) on the checking fixture to press the fender part (1) and the A surface positioning surface; S2.4: Use the hole diameter pin (11) to check the clearances between the positioning holes on the flange surface and other assembly holes; S2.5: Close the fender contour detection plate (6) to check the flange positioning profile and the clearances of each assembly surface.

3. The inspection method of a fender part according to claim 1, characterized in that, S4 includes the following steps: S4.1: Remove the fender contour detection plate (6); S4.2: Insert the positioning pin (8) into the flange surface positioning holes of the fender part (1), and press the corresponding pressing head (4) of the flange surface positioning surface; S4.3: Remove the pressing head (4) of the A surface positioning surface and remove the CH hole pin (3); S4.4: Use the hole diameter pin (11) to check the clearances of each assembly hole; S4.5: Remove all the hole diameter pins (11), and only keep the positioning pin (8); S4.6: Close the fender contour detection plate (6) to check the reference surface clearance.

4. The inspection method of a fender part according to claim 1, characterized in that, In S1, the CH hole is opened near the wheel edge of the fender part.

5. The inspection method of a fender part according to claim 2, characterized in that, In S2.4, the distance between the positioning profile of the fender contour detection plate and the fender part is 0 mm.

6. The inspection method of a fender part according to claim 2, characterized in that, In S2.4, the distance between the detection profile of the fender contour detection plate and the fender part is 3 mm.

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