Method for eliminating appearance defects of vehicle door outer panel

Abstract

The present invention relates to a method for eliminating appearance defects of a vehicle door outer panel, comprising the following steps: S1, determining a part reference line based on the outer shapes of components on the surface of the door outer panel, and determining a mold reference line at a corresponding position of a mold; S2, measuring a part face difference value along the part reference line and drawing a part face difference trend line, and measuring a mold face difference value along the mold reference line and drawing a mold face difference trend line; S3, comparing and analyzing the part face difference trend line and the mold face difference trend line, and determining a position where the deviation states of the two trend lines are consistent as a correction coarse positioning position; S4, determining a specific position to be corrected on the mold surface according to the correction coarse positioning position and performing correction. This method can conveniently determine the mold correction position and correction amount, can be quickly mastered by correction workers, has good stability, good reproducibility, and no side effects, greatly reduces the difficulty of debugging, and shortens the debugging cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile appearance part production, and in particular to a method for eliminating appearance defects of a door handle on an outer door panel. Background Art

[0002] Among automotive panels, door outer panels are among the most critical exterior components, demanding exceptionally high aesthetic standards. Because the door handles on these panels are the counter-forming area of ​​the die, surface collapse defects are easily and difficult to correct around them. This area is also the most challenging part of the door outer panel production process to correct for appearance, requiring the most time and effort in mold development and quality improvement, and is the most prone to rework and repair.

[0003] The current practice is to first polish the mold, then determine the approximate location of the defect after the part is pressed out. Repeated on-site observation and analysis are performed to identify the location where the mold needs to be corrected. This results in poor results, a large workload for research and development, and multiple rounds of adjustments. The biggest difficulty faced by fitters during the correction process is the specific location of the correction and the amount of correction required. This leaves the correction personnel unsure of how to make the correction, resulting in unclear goals, a waste of time, and the risk of making mistakes. There are no rules to follow, and the work relies entirely on the experience of experienced employees. As a result, it is both time-consuming and laborious for the staff to eliminate this defect, but it is difficult to achieve the desired effect. A lot of work and effort has been spent, but it is difficult to obtain a substantial solution. Therefore, there is an urgent need for a process method that can quickly confirm the location of the part to be corrected to eliminate the defect. Summary of the Invention

[0004] Based on the above description, the present invention provides a method for eliminating appearance defects of vehicle door outer panels to solve the technical problem in the prior art that the position to be corrected in the door handle area of ​​the door outer panel cannot be specifically determined, resulting in the need for repeated trial and error, and can only rely on experience, and the defect elimination cannot achieve the expected effect.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A method for eliminating appearance defects of a vehicle door outer panel comprises the following steps:

[0007] S1. Determine the part reference line based on the outer shape of the door outer panel surface components, and determine the mold reference line at the corresponding position of the mold;

[0008] S2. Measure the part face difference along the part reference line and draw a part face difference trend line; measure the mold face difference along the mold reference line and draw a mold face difference trend line;

[0009] S3. Compare and analyze the part flushness trend line and the mold flushness trend line, and determine that the position where the deviation of the two trend lines is consistent is the corrected coarse positioning position;

[0010] S4. Determine the specific position to be corrected on the mold surface according to the corrected rough positioning position and perform the correction.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0012] The method for eliminating appearance defects provided by the present application first determines the part baseline and the mold baseline based on the outer shape of the door handle, then measures the face difference value according to the two baselines and draws the face difference trend line, determines the correction rough positioning position according to the face difference trend line, and finally determines the specific position to be corrected according to the rough positioning position and corrects it. This method can easily determine the mold correction position and correction amount, and can be quickly mastered by the correction workers. The technology has good stability, good reproducibility, and no side effects, which greatly reduces the difficulty of debugging and shortens the debugging cycle.

[0013] On the basis of the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, the surface component includes a door handle, and the reference line is parallel to the extension direction of the door handle.

[0015] Furthermore, there are two part reference lines, and the two part reference lines are respectively determined by being spaced apart by a predetermined distance from the outermost ends of the boundaries on both sides of the door handle. The mold correspondingly has two mold reference lines.

[0016] Furthermore, the part reference line has a part flushness measurement starting point, which is determined by a predetermined distance from the outermost end of the inner boundary of the door handle, and the mold reference line has a corresponding mold flushness measurement starting point.

[0017] Furthermore, the part face difference trend line is a continuous broken line with the part face difference measurement starting point as the origin, the part reference line as the coordinate, and the part face difference value as the vertical coordinate; the mold face difference trend line is a continuous broken line with the mold face difference measurement starting point as the origin, the mold reference line as the coordinate, and the mold face difference value as the vertical coordinate.

[0018] Furthermore, the face difference values ​​of the parts and the mold are measured by the combination of a face difference meter and a three-point gauge base. The three-point gauge base includes a base body and three positioning terminals. The upper end of the base body has an upper plane. The three positioning terminals are non-collinearly installed at the lower end of the base body. The lower ends of the three positioning terminals determine a lower plane parallel to the upper plane. The base body has a mounting hole that passes through the upper and lower parts. The axis of the mounting hole is perpendicular to the lower plane. The probe of the face difference meter extends from the upper end of the mounting hole to the lower end of the mounting hole.

[0019] Furthermore, the three positioning terminals form an isosceles triangle, and the mounting hole is located at the midpoint of the base of the isosceles triangle.

[0020] Furthermore, the specific position to be corrected is determined on the mold surface according to the corrected rough positioning position, including:

[0021] S41. Use a transparent film to draw a rough positioning position on the part;

[0022] S42, drawing the door handle boundary outline on the transparent film;

[0023] S43, covering the mold with a transparent film, and determining a specific position to be corrected based on the mold face difference trend line and the door handle boundary contour.

[0024] Furthermore, the transparent film is a transparent plastic cloth.

[0025] Furthermore, the mold includes a door outer panel drawing die. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the steps of a method for eliminating appearance defects of a door outer panel provided by an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of determining the part reference line in step S1 in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the state of measuring the part face difference value in step S2 in an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the structure of the three-point gauge base in an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of a part flushness trend line and a mold flushness trend line in an embodiment of the present invention;

[0031] Figure 6 4 is a schematic diagram of a specific flow chart of step S4 in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0034] It will be understood that spatial relational terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under the other elements" or "under it" or "below it" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90° or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0035] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0036] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0037] The present application provides a method for eliminating appearance defects of a door outer panel, which comprises the following steps:

[0038] S1. Determine the part reference line based on the outer shape of the door outer panel surface component, and determine the mold reference line at the corresponding position of the mold, that is, determine the reference line for flushness measurement.

[0039] In this embodiment, the surface component of the vehicle door outer panel is a door handle. Since the shape and extension direction of the door handle may be different on different vehicle models, in actual operation, however, in the current automobile exterior design, the door handle is generally designed to be a symmetrical structure and extends in the front-to-back direction. Although it itself is an irregular shape, its external shape design has a certain regularity. Therefore, in this method, the part reference line can be determined based on the external shape of the door handle. Since the vehicle door outer panel is formed by die drawing, the mold has a shape structure corresponding to the surface of the vehicle door outer panel. Therefore, a corresponding mold reference line can also be made on the mold.

[0040] In order to facilitate marking, the reference line is parallel to the extension direction of the door handle.

[0041] like Figure 2 As shown, the door handle 10 extends horizontally in the left-right direction on the door outer panel, and the part reference line 20 is a horizontal line segment.

[0042] Among them, the number of the part reference lines 20 is two, and the two part reference lines 20 are determined by the outermost ends of the two side boundaries of the door handle 10 at a predetermined distance. In this embodiment, the two side boundaries of the door handle are smooth curves, and the outermost ends are its uppermost and lowermost positions. Horizontal lines are drawn at intervals of 10 mm, which are the part reference lines.

[0043] It should be noted that in order to ensure that all surface differences in the door handle area are fully covered, the length of the part reference line is greater than the horizontal extension length of the door handle, and the projection of the door handle in the length direction is completely located on the part reference line 20.

[0044] Correspondingly, the mold baseline is determined on the mold according to the position of the part baseline.

[0045] S2. Measure the part face difference value along the part reference line and draw the part face difference trend line, and measure the mold face difference value along the mold reference line and draw the mold face difference trend line, that is, measure the face difference value and draw the face difference trend line.

[0046] The traditional flushness meter can measure flushness, but because its base is a smooth surface, it can only measure the door outer panel with a relatively smooth surface. Due to the requirements of the current streamlined design and radian design of automobiles, most door outer panels adopt door designs with a certain curved surface. The traditional flushness meter cannot achieve flushness measurement. Therefore, this application adopts a new flushness measurement tool. In this embodiment, combined with Figure 2 As shown, the face difference value is measured by the face difference table 30 and the three-point gauge base 40.

[0047] Specifically, the face difference gauge 30 includes a meter head and a probe. Since the face difference value measured is displayed on the meter head, a pointer display or an electronic display can be used according to actual needs. In this embodiment, an electronic display is used, and the probe is used to contact the position to be measured, and to extend or compress to reflect the face difference change. The three-point gauge base 40 includes a base body 41 and three positioning terminals 42. The upper end of the base body 41 has an upper plane. The three positioning terminals 42 are not installed in a collinear manner at the lower end of the base body 41. The three positioning terminals 42 are not installed in a collinear manner, that is, a triangular arrangement structure is formed between the three positioning terminals 42, and the lower end thereof must constitute a unique determined plane, that is, the lower ends of the three positioning terminals 42 determine a lower plane parallel to the upper plane; the base body 41 has a mounting hole 41a that passes through the upper and lower parts, and the axis of the mounting hole 41a is perpendicular to the lower plane. The probe of the face difference gauge 30 extends from the upper end of the mounting hole 41a and extends to the lower end of the mounting hole 41a.

[0048] Through the design of the three positioning terminals 42, when the three-point gauge base 40 contacts the vehicle door outer panel, it only contacts the vehicle door outer panel through the lower end surfaces of the three positioning terminals 42, thereby achieving stable contact between the three-point gauge base 40 and the vehicle door outer panel and ensuring measurement accuracy.

[0049] In some preferred embodiments of the present application, the three positioning terminals 42 form an isosceles triangle, and the mounting hole 41 a is located at the midpoint of the base of the isosceles triangle 42 .

[0050] The base body 41 is designed as a left-right symmetrical structure as a whole, with a connecting block on each of the left and right sides and the front side. The lower ends of the connecting blocks on the left and right sides are respectively connected to a positioning terminal 42, and the lower end of the connecting block on the front side is connected to a positioning terminal. The rear side of the base body 41 is designed as a vertical plane, and a mounting hole 41a is formed in the middle of the base body 41. The function of measuring the face difference along a straight line can be realized by cooperating with the ruler and the vertical plane.

[0051] In order to facilitate the comparative analysis of part flushness trends and mold flushness trends, a part flushness measurement starting point is provided on the part baseline, and a corresponding mold flushness measurement starting point is provided on the mold baseline. The flushness detection starts with the measurement starting point and is measured evenly at intervals along the length direction, wherein the part flushness measurement starting point is determined by a predetermined distance from the outermost end of the inner boundary of the door handle. In this embodiment, the inner side is the side of the door that is closer to the car body when turning on the door, the inner boundary of the door handle is a smooth curve, and the outermost end is its left end position. Vertical lines are drawn at intervals of 100 mm, and the intersection of the vertical line and the part baseline is the part flushness measurement starting point, and the corresponding position on the mold is the mold flushness measurement starting point.

[0052] like Figure 2As shown, then take the part flush measurement starting point as the origin, the part reference line extending from the inside to the outside as the horizontal axis, and the part flush value from concave to convex as the vertical axis, draw a continuous broken line, and you can get the part flush trend line A on the corresponding part reference line; similarly, take the mold flush measurement starting point as the origin, the mold reference line as the horizontal axis, and the mold flush value as the vertical axis to draw a continuous broken line, and you can get the mold flush trend line B.

[0053] S3. Compare and analyze the part face difference trend line A and the mold face difference trend line B, and determine that the position where the deviation of the two trend lines is consistent is the corrected coarse positioning position, that is, determine the corrected coarse positioning position.

[0054] According to the above description, the surface shape of the part is formed by die drawing. Therefore, when the die and the part surface have the same abnormal flushness trend, it can be determined that the abnormal flushness is caused by the die. Therefore, it can be determined that the die corresponding to the area has defects and needs to be corrected. That is, the position where the deviation of the two trend lines is consistent is determined as the correction rough positioning position, such as Figure 2 Position within the dotted box.

[0055] S4. Determine the specific position to be corrected on the mold surface according to the corrected rough positioning position and perform correction; that is, determine the specific position to be corrected and perform correction.

[0056] By correcting the rough positioning position and comparing it with the part face difference trend line, the specific location of the position can be determined on the part, and then the specific location on the mold, that is, the specific position to be corrected, can be found based on the shape correspondence between the mold and the part surface.

[0057] In an embodiment of the present application, the specific position to be corrected determined on the mold surface according to the corrected rough positioning position includes:

[0058] S41, such as Figure 6 a. Draw the rough positioning position and the boundary outline of the door handle on the part;

[0059] S42, such as Figure 6 b and 6c, cover the part with a transparent film and trace the rough positioning position and the boundary outline of the door handle on the transparent film;

[0060] S43, such as Figure 6 d-6f, cover the mold with a transparent film and determine the specific position to be corrected based on the mold surface difference trend line and the traced line.

[0061] Specifically, the transparent film is a transparent plastic sheet. This step is to use the transparent plastic sheet to copy the easily determined position on the part onto the mold, and then obtain the specific position to be corrected on the mold. The correction amount can also be determined based on the mold surface difference trend line.

[0062] After determining the specific position to be corrected and the amount of correction, the correction worker can make the correction. The correction is a conventional process, that is, the high points on the mold surface are polished and corrected, and the low-lying positions need to be re-grinded to ensure a good fit here.

[0063] After practical application and promotion, a standard operating manual for this technology can be formulated, and the correction standard for the mold can be specified. That is, when the difference between the maximum and minimum values ​​of all points within a certain range in the marked area exceeds a certain threshold, the mold needs to be corrected. If it is within the threshold, it can be accepted at discretion. In a specific embodiment, if the difference between the maximum and minimum values ​​of all points within any 100mm in the marked area exceeds 40μm, the mold needs to be corrected. This realizes the quantification of the defects of the door handle on the outer panel, makes the appearance of the parts easier to manage and control, and also enables everyone to have a unified understanding and unified standards for the appearance defects here.

[0064] Using the correction method provided in this application, the mold correction position and correction amount can be easily determined, and fitters can quickly master it. This technology has been successfully applied to door outer panels of many models, such as Dongfeng Nissan New Luqman, Dongfeng Renault Koleos, Nissan Navara, Dongfeng Nissan New Teana and other models. This technology has good stability, good reproducibility, and no side effects, which greatly reduces the difficulty of debugging and shortens the debugging cycle.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for eliminating appearance defects of a vehicle door outer panel, comprising the following steps: S1. Determine the part reference line based on the outer shape of the door outer panel surface components, and determine the mold reference line at the corresponding position of the mold; The surface component includes a door handle, and the reference line is parallel to the extension direction of the door handle; there are two part reference lines, and the two part reference lines are respectively determined by the outermost ends of the two side boundaries of the door handle at a predetermined distance, and the mold has two corresponding mold reference lines; a part flushness measurement starting point is provided on each part reference line, and the part flushness measurement starting point is determined by the outermost end of the inner side boundary of the door handle at a predetermined distance, and the mold reference line has a corresponding mold flushness measurement starting point; S2. Measure the part face difference along the part reference line and draw a part face difference trend line; measure the mold face difference along the mold reference line and draw a mold face difference trend line; S3. Compare and analyze the part flushness trend line and the mold flushness trend line, and determine that the position where the deviation of the two trend lines is consistent is the corrected coarse positioning position; S4. Determine the specific position to be corrected on the mold surface according to the corrected rough positioning position and perform correction.

2. The method for eliminating appearance defects of a vehicle door outer panel according to claim 1, characterized in that: The part flushness trend line is a continuous broken line drawn with the part flushness measurement starting point as the origin, the part reference line as the horizontal coordinate, and the part flushness value as the vertical coordinate; The mold face difference trend line is a continuous broken line drawn with the mold face difference measurement starting point as the origin, the mold reference line as the horizontal coordinate, and the mold face difference value as the vertical coordinate.

3. The method for eliminating appearance defects of a vehicle door outer panel according to claim 1, characterized in that: The part surface difference value and the mold surface difference value are measured by the combination of the surface difference meter and the three-point gauge base. The three-point gauge base includes a base body and three positioning terminals. The upper end of the base body has an upper plane. The three positioning terminals are non-collinearly installed at the lower end of the base body. The lower ends of the three positioning terminals determine a lower plane parallel to the upper plane. The base body has a mounting hole that passes through the upper and lower parts. The axis of the mounting hole is perpendicular to the lower plane. The probe of the surface difference meter extends from the upper end of the mounting hole to the lower end of the mounting hole.

4. The method for eliminating appearance defects of a vehicle door outer panel according to claim 3, characterized in that: The three positioning terminals form an isosceles triangle, and the mounting hole is located at the midpoint of the base of the isosceles triangle.

5. The method for eliminating appearance defects of a vehicle door outer panel according to claim 1, characterized in that: The step of determining the specific position to be corrected on the mold surface according to the corrected rough positioning position includes: S41, drawing the rough positioning position and the door handle boundary outline on the part; S42, covering the part with a transparent film, and copying the rough positioning position and the boundary contour of the door handle on the transparent film; S43, covering the mold with a transparent film, and determining the specific position to be corrected based on the mold surface difference trend line and the copying line.

6. The method for eliminating appearance defects of a vehicle door outer panel according to claim 5, characterized in that: The transparent film is a transparent plastic cloth.

7. The method for eliminating appearance defects of a vehicle door outer panel according to claim 1, characterized in that: The mold includes a door outer panel drawing die.

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