A mold surface soft compensation method for improving the surface quality of vehicle body exterior panels

Abstract

The application discloses a kind of mould surface soft compensation methods of body outer covering surface quality, including soft compensation before basic data quantization, the application of soft compensation medium-AB glue, the application of correction soft compensation surface special tool and symbol type process control means etc..The method uses precise measuring equipment to confirm the body outer covering surface quality defect state and the body outer covering mould male die A surface state determines experimental compensation position;Through the body outer covering surface quality defect range and the body outer covering mould male die A surface loss range comparison and determine experimental compensation range;Select reasonable soft compensation medium covering and solidify in the body outer covering mould male die A surface experimental compensation area;Standard experimental compensation process control and correction method to guarantee the experimental surface fullness of soft compensation medium covering and solidified after the body outer covering mould male die A surface experimental compensation area finally determines experimental compensation amount, effectively improves the body outer covering surface quality.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle engineering, and in particular relates to a method for soft compensation of a mold surface for improving the surface quality of an outer covering part of a vehicle body. Background Art

[0002] After the original compensation scheme for the mold surface of the body exterior cover is determined in the industry, it is necessary to experiment with the compensation position, compensation range, compensation amount, etc. on the mold surface of the body exterior cover. The experimental method mostly adopts the tape compensation experiment method. The specific operation method is to stick tapes of different thicknesses on the mold surface area corresponding to the surface quality defects of the body exterior cover according to the surface quality defect status to simulate the contour trend of the surface after compensation. This method is limited by the material itself. After the simulated compensation, the surface smoothness is poor, and the fullness of the mold surface of the body exterior cover cannot be accurately restored, which directly affects the authenticity judgment of the compensation position, compensation range, and compensation amount. It is even more impossible to experimentally confirm the mold surface of the body exterior cover with complex shapes. Therefore, although this method has high verification efficiency, the verification accuracy is not high. In this case, multiple experiments are required to achieve the ideal compensation effect, which seriously affects the improvement of the surface quality of the body exterior cover and prolongs the cycle of improving the surface quality of the body exterior cover. Summary of the Invention

[0003] In order to solve the problem that the verification efficiency of the tape experimental compensation method for the vehicle body outer cover mold surface is high but the verification accuracy is low, the surface smoothness after tape compensation is poor and the fullness of the vehicle body outer cover mold surface cannot be accurately restored, the present invention provides a mold surface soft compensation method for the surface quality of the vehicle body outer cover, which has the advantages of accuracy and easy modification, and effectively reflects the authenticity judgment of the experimental compensation position, compensation range and compensation amount on the vehicle body outer cover mold surface, and fundamentally solves the problem that the verification efficiency of the tape experimental compensation method is high but the verification accuracy is low, effectively improves the surface quality of the vehicle body outer cover, greatly shortens the cycle of improving the surface quality of the vehicle body outer cover, and ensures the production stability of the stamping vehicle body outer cover mold.

[0004] To address the technical challenges of experimental compensation, the present invention selects a suitable soft compensation medium, fully utilizing the fluid properties of the medium before solidification and the self-leveling principle of the fluid medium when covering the molded surface. This approach aims to ensure that the medium remains within the molded surface of complex body panels, particularly on the molded surface of a vehicle body panel. By leveraging the time lag between the liquefaction and solidification of the soft compensation medium, the present invention utilizes the principle of forcing conformal solidification of process components and uses qualified and stable process components from previous processes to control the compensation process. Compared to existing tape compensation experimental methods, the present invention more accurately determines the compensation position, compensation range, and compensation amount after experimental compensation of the vehicle body panel mold surface.

[0005] The technical solution of the present invention is as follows: a method for soft compensation of mold surface for improving the surface quality of vehicle body outer covering parts, comprising the following steps:

[0006] S1 uses precision measuring equipment to measure the surface quality defects of the body outer cover and the A-surface of the punch of the body outer cover mold, and calculates the compensation position and compensation range of the A-surface of the punch of the body outer cover mold;

[0007] S2, based on the compensation position and compensation range of S1, mixes the soft compensation medium and AB glue in equal amounts and applies the mixture to the position where experimental compensation is required on the A surface of the punch of the body outer cover mold;

[0008] S3: Use a qualified, stable, and cleaned inner surface of the previous process workpiece to buckle it on the glue coating surface and let it stand for 30 minutes. When the temperature of the glue and the parts drops below 50℃, remove the workpiece from the previous process and confirm whether the soft compensation medium - AB glue has reached the correctable curing strength;

[0009] If the correctable curing strength is not reached in S4, continue to wait until it is reached; if the correctable curing strength is reached, use an eccentric vibration grinder to grind and correct the glued surface;

[0010] S5 uses the inner surface of the previous process part that is qualified, stable and has a clean inner surface to color the soft compensation surface of the mold punch A surface;

[0011] S6 then uses an eccentric vibration grinder to correct the soft compensation surface of the mold punch A surface as a whole until the soft compensation surface of the mold punch A surface is evenly colored;

[0012] S7 uses precision measuring equipment to perform secondary data measurement on the soft compensation correction surface of the A-side of the punch of the body outer cover mold. The soft compensation correction surface data of the A-side of the mold punch is compared with the data in S1 to confirm the correction status. If the requirements are met, the mold is left to stand for 24 hours; if the requirements are not met, repeat steps S1-S7.

[0013] S8 uses precision measuring equipment to perform three data measurements on the soft compensation correction surface of the A-side of the punch of the body outer cover mold to confirm the experimental compensation amount of the A-side of the punch of the body outer cover mold, and retains the data as the basic data for mold surface compensation to optimize the surface quality of the body outer cover, and produces test pieces for verification.

[0014] Furthermore, in step S4, the grinding correction method is cover grinding.

[0015] Furthermore, in steps S1, S7 and S8, the measurement accuracy of the precision measuring equipment is 0.001-0.01 mm.

[0016] Furthermore, in steps S2 and S3, the soft compensation medium - AB glue has a self-leveling principle, and the correction allowance error is ≤0.5mm;

[0017] Furthermore, the grinding accuracy verified by the test piece in step S8 is ≤0.01 mm.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a method for soft compensation of mold surfaces for vehicle body exterior covering parts, which has the advantages of accuracy and easy modification. It effectively reflects the authenticity judgment of experimental compensation position, compensation range and compensation amount on the mold surface of vehicle body exterior covering parts, and fundamentally solves the problem that the verification efficiency of the tape experimental compensation method is high but the verification accuracy is not high. It effectively improves the surface quality of vehicle body exterior covering parts, greatly shortens the cycle of improving the surface quality of vehicle body exterior covering parts, and ensures the production stability of stamping vehicle body exterior covering parts molds.

[0020] To address the technical challenges of experimental compensation, the present invention selects a suitable soft compensation medium, fully utilizing the fluid properties of the medium before solidification and the self-leveling principle of the fluid medium when covering the molded surface. This approach aims to ensure that the medium remains within the molded surface of complex body panels, particularly on the molded surface of a vehicle body panel. By leveraging the time lag between the liquefaction and solidification of the soft compensation medium, the present invention utilizes the principle of forcing conformal solidification of process components and uses qualified and stable process components from previous processes to control the compensation process. Compared to existing tape compensation experimental methods, the present invention more accurately determines the compensation position, compensation range, and compensation amount after experimental compensation of the vehicle body panel mold surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the state of measuring surface quality defects of vehicle body exterior panels using the precision measuring equipment of the present invention.

[0022] Figure 2 This is a schematic diagram of the state of the precision measuring equipment in the present invention measuring the A surface of the punch of the vehicle body outer cover mold.

[0023] Figure 3 Schematic diagram of soft compensation medium-AB glue coating in the present invention.

[0024] Figure 4 It is a schematic diagram of the gluing surface of the process part in the front process of the present invention.

[0025] Figure 5 This is a schematic diagram of the correction of the soft compensation surface of the mold punch A surface by the eccentric vibration grinder in the present invention.

[0026] Figure 6 Flowchart of the soft compensation technology in the present invention.

[0027] In the picture:

[0028] 1- Precision measuring equipment; 2- Surface quality defects of vehicle body exterior panels; 3- Surface A of the punch of the vehicle body exterior panel mold; 4- Soft compensation medium - AB glue; 5- Process parts of the previous process; 6- Glue coating surface; 7- Soft compensation surface of the punch A of the mold; 8- Eccentric vibration grinder; 9- Flexible grinding disc; 10- Flexible grinding sheet; 11- Soft compensation correction surface of the punch A of the mold. DETAILED DESCRIPTION

[0029] It should be noted that in the description of the present invention, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction.

[0030] In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, "fixed" can refer to fixed connection, detachable connection, or integration; connection can refer to mechanical connection or electrical connection; connection can refer to direct connection or indirect connection through an intermediate medium, and can refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] A mold surface soft compensation method for improving the surface quality of a vehicle body outer covering part comprises the following steps:

[0032] A1. Use precision measuring equipment 1 to measure and confirm the status of surface quality defects 2 on the vehicle body exterior panel;

[0033] A2. Use precision measuring equipment 1 to measure and confirm the status of the A surface 3 of the punch of the vehicle body outer cover mold;

[0034] A3. By comparing the data of the surface quality defect 2 of the body panel with the data of the punch A surface 3 of the body panel mold, the position of the punch A surface 3 of the body panel mold that requires experimental compensation is determined;

[0035] A4. Confirm the scope of surface quality defects 2 of the vehicle body exterior panels;

[0036] A5. Confirm the missing area of ​​the A surface 3 of the punch of the body outer cover mold;

[0037] A6. Compare the extent of surface quality defect 2 of the body panel with the extent of missing material on the punch A surface 3 of the body panel mold to determine the extent of the required experimental compensation on the punch A surface 3 of the body panel mold.

[0038] A7. Select the soft compensation medium with fluid properties before curing - AB glue 4;

[0039] A8. Based on the range of compensation required for the punch A surface 3 of the body exterior panel mold, take a sufficient amount of soft compensation medium - AB glue 3 and mix them in equal amounts to form a fluid state;

[0040] A9. Apply the soft compensation medium (AB glue) 4 in a fluid state evenly to the position where experimental compensation is required on the A surface 3 of the body outer cover mold, covering the effective range;

[0041] A10. When the fluid soft compensation medium - AB glue 4 on the punch A surface of the mold is in a semi-solidified state, a qualified, stable, and cleaned inner surface of a previous process part 5 is buckled onto the glue-coated surface 6 to help the soft compensation medium conform to the shape and reduce the correction amount.

[0042] A11. After the workpiece 5 of the previous process is placed on the glue-coated surface 6 and left to stand for 30 minutes, when the temperature of the glue and the part drops below 50°C, remove the workpiece 5 of the previous process and confirm whether the soft compensation medium - AB glue 4 is solidified. The criterion for judging the solidification state is that the glue does not stick to your hands;

[0043] A12. Confirm whether the soft compensating medium - AB glue 4 on the mold punch A surface has reached the correctable curing strength. The judgment standard for correctable curing strength is that the finger cannot be pressed into the glue surface;

[0044] A13. When the fluid soft compensating medium - AB glue 4 on the punch A surface of the mold reaches a correctable solidification strength, use the eccentric vibration grinder 8 to correct the glue-coated surface 6;

[0045] A14. When using the eccentric vibration grinder 8 to correct the soft compensation surface 7 of the mold punch A surface, make full use of the flexible grinding force obtained by the flexible grinding disc 9 and the flexible grinding sheet 10 of the eccentric vibration grinder 8 to perform covering grinding correction;

[0046] A15. When using the eccentric vibration grinder 8 to correct the soft compensation surface 7 of the mold punch A surface, the inner surface of the process part 5 from the previous process, which is qualified, stable, and has a clean inner surface, is still used to color the soft compensation surface 7 of the mold punch A surface to confirm the conformity of the shape.

[0047] A16, then use the eccentric vibration grinder 8 to correct the soft compensation surface 7 of the mold punch A surface as a whole until the soft compensation surface 7 of the mold punch A surface is evenly colored;

[0048] A17. Perform secondary data measurement of the soft compensation correction surface 11 on the A-surface of the body exterior panel mold punch using precision measuring equipment 1 to confirm the smoothness of the soft compensation correction surface 11 on the A-surface of the mold punch;

[0049] A18, after the confirmation of the mold convex A surface soft compensation correction surface 11 smoothing of the body outer covering mold convex A surface soft compensation correction surface 11, the mold is placed for 24 hours, so as to ensure that the mold convex A surface soft compensation correction surface 11 glue is completely hardened, the glue strength and adhesion reach the standard state;

[0050] A19, after the body outer covering mold convex A surface soft compensation correction surface 11 glue strength and adhesion reach the standard, the mold out of the experimental piece verification;

[0051] A20, through the precise measuring equipment 1 to the surface of the body outer covering experimental piece data measurement, confirm the surface defect state of the body outer covering experimental piece;

[0052] A21, if the surface defect of the body outer covering experimental piece is not completely eliminated, the soft compensation medium-AB glue 4 compensation process can be carried out again, and the soft compensation surface correction process is repeated;

[0053] A22, if the surface defect of the body outer covering experimental piece is completely eliminated, through the precise measuring equipment 1 to the surface of the body outer covering experimental piece data measurement, confirm the surface defect state of the body outer covering experimental piece;

[0054] Preferably, in A1, A2, A3, A4, A5, A6, A17, A20, A22, the surface quality defect 2 of the body outer covering and the convex A surface 3 of the body outer covering mold are measured and confirmed by the precise measuring equipment 1 (the precise measuring equipment measures the surface state of the body outer covering and the convex A surface state of the mold, confirms the defect state, confirms the compensation position, compensation range and compensation amount), the measurement accuracy is 0.001-0.01mm;

[0055] Preferably, in A7, A8, A9, A10, A11, A12, the reasonable soft compensation medium-AB glue 4 is selected, the fluid characteristics before the medium is cured are fully utilized, the self-leveling principle when the fluid medium covers the surface is utilized, especially in the complex modeling of the body outer covering mold convex A surface, the compensation process control is carried out by means of qualified stable pre-process process piece 5, the process piece is forced to meet the type curing, the soft compensation medium is reasonably stopped, and the correction allowance is controlled within 0.5mm;

[0056] Preferably, in A13, A14, A15, A16, A18, A19, and A21, the inner surface of the process part 5 of the previous process that is qualified, stable, and has a clean inner surface is used to perform conformal coloring confirmation on the soft compensation surface 7 of the punch A surface of the vehicle body outer cover mold, and an eccentric vibration grinder is used to correct the soft compensation surface 7 of the punch A surface of the mold as a whole. After the soft compensation surface 7 of the punch A surface of the mold is corrected and smoothed, a test piece is produced for verification, and the grinding accuracy of the soft compensation correction surface 11 of the punch A surface of the mold is 0.01 mm;

[0057] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As shown, after ensuring that the surface quality defects of the body outer panel are stable, the reference state of the body outer panel mold punch A surface is confirmed, and the data of the body outer panel surface quality defects are measured by precision measuring equipment 1, and then the data of the body outer panel mold punch A surface is measured by precision measuring equipment 1, and the body outer panel surface quality defect data is compared with the body outer panel mold punch A surface data to confirm the position of the body outer panel mold punch A surface that requires experimental compensation; the body outer panel surface quality defect 2 range is confirmed, and then the body outer panel mold punch A surface 3 missing range is confirmed, and the body outer panel surface quality defect range and the body outer panel mold punch A surface missing range are compared. Compare and confirm the range of experimental compensation required on the A surface of the punch of the vehicle body cover mold; select the soft compensation medium with fluid properties before solidification - AB glue 4, and according to the range of compensation required on the A surface of the punch of the vehicle body cover mold, evenly apply the soft compensation medium - AB glue 4 in fluid state on the position of the punch A surface of the vehicle body cover mold that needs experimental compensation to cover the effective range. When the fluid soft compensation medium - AB glue 4 on the punch A surface of the mold is in a semi-solidified state, use a qualified, stable and cleaned-up previous process part 5 to buckle it on the glued surface 6 to help the soft compensation medium conform to the shape and reduce the correction amount. After the previous process part 5 is buckled on the glued surface 6 and left to stand for 30 minutes, the temperature of the colloid and the parts drops to 5 When the temperature is below 0℃, remove the process part 5 of the previous process and confirm that the soft compensation medium - AB glue 4 reaches the correctable curing strength; use the eccentric vibration grinder 8 to cover the glue surface 6 for grinding and correction. In the process, the inner surface of the process part 5 of the previous process that is qualified, stable and has a clean inner surface is still used to perform conformal coloring confirmation on the soft compensation surface 7 of the mold punch A surface. The soft compensation surface 7 of the mold punch A surface is corrected as a whole until it is evenly colored; use the precision measuring equipment 1 to perform secondary data measurement on the soft compensation correction surface 11 of the mold punch A surface of the body outer cover to confirm the smooth state of the soft compensation correction surface 11 of the mold punch A surface, and let the mold stand for 24 hours to ensure that the colloid of the soft compensation correction surface 11 of the mold punch A surface is completely hardened and the colloid is strong. The degree and adhesion reach the standard state, and the mold is tested for verification. The surface of the body outer cover test piece is measured by precision measuring equipment 1 to confirm the surface defect status of the body outer cover test piece. If the surface defects of the body outer cover test piece are not completely eliminated, the compensation process of the soft compensation medium-AB glue 4 can be carried out again in a targeted manner, and the soft compensation surface correction process is repeated. If the surface defects of the body outer cover test piece are completely eliminated, the soft compensation correction surface 11 of the body outer cover mold punch A surface is measured three times by precision measuring equipment 1 to confirm the experimental compensation amount of the body outer cover mold punch A surface, and retain the data as the basic data for mold surface compensation to optimize the surface quality of the body outer cover.

[0058] The foregoing description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by any person skilled in the art within the technical scope disclosed herein and within the spirit and principles of the present invention shall be covered by the scope of protection of the present invention. Furthermore, any matters not described in detail in this specification constitute prior art known to those skilled in the art.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A method for soft compensation of mold surface quality of vehicle body outer covering parts, characterized in that: include: S1 uses precision measuring equipment to measure the surface quality defects of the body outer cover and the A-surface of the punch of the body outer cover mold, and calculates the compensation position and compensation range of the A-surface of the punch of the body outer cover mold; S2, based on the compensation position and compensation range of S1, mixes the soft compensation medium and AB glue in equal amounts and applies the mixture to the position where experimental compensation is required on the A surface of the punch of the body outer cover mold; S3: Use a qualified, stable, and cleaned inner surface of the previous process workpiece to buckle it on the glue coating surface and let it stand for 30 minutes. When the temperature of the glue and the parts drops below 50℃, remove the workpiece from the previous process and confirm whether the soft compensation medium - AB glue has reached the correctable curing strength; If the correctable curing strength is not reached in S4, continue to wait until it is reached; if the correctable curing strength is reached, use an eccentric vibration grinder to grind and correct the glued surface; S5 uses the inner surface of the previous process part that is qualified, stable and has a clean inner surface to color the soft compensation surface of the mold punch A surface; S6 then uses an eccentric vibration grinder to correct the soft compensation surface of the mold punch A surface as a whole until the soft compensation surface of the mold punch A surface is evenly colored; In step S7, a precision measuring device is used to perform a secondary measurement of the soft compensation correction surface of the A-side of the punch die of the vehicle body outer cover mold. The soft compensation correction surface data of the A-side of the punch die is compared with the data in step S1 to confirm the correction status. If the correction status is not met, steps S1-S7 are repeated. If the correction status is met, the mold is left to stand for 24 hours. S8 uses precision measuring equipment to perform three data measurements on the soft compensation correction surface of the A-side of the punch of the body outer cover mold to confirm the experimental compensation amount of the A-side of the punch of the body outer cover mold, and retains the data as the basic data for mold surface compensation to optimize the surface quality of the body outer cover, and produces test pieces for verification.

2. A mold surface soft compensation method for the surface quality of a vehicle body outer covering according to claim 1, characterized in that: In step S4, the grinding correction method is cover grinding.

3. The method for soft compensation of mold surface for vehicle body outer covering parts according to claim 1, characterized in that: In steps S1, S7 and S8, the measurement accuracy of the precision measuring equipment is 0.001-0.01 mm.

4. A mold surface soft compensation method for the surface quality of a vehicle body outer covering according to claim 1, characterized in that: In steps S2 and S3, the positive allowance error of the soft compensation medium-AB glue repair is ≤0.5mm.

5. A mold surface soft compensation method for the surface quality of a vehicle body outer covering part according to any one of claims 1 to 4, characterized in that: The grinding accuracy verified by the test piece in step S8 is ≤0.01 mm.

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