Die compensation method for improving surface quality of automobile outer covering part

Abstract

The invention provides a mold compensation method for improving the surface quality of an automobile outer covering part, which comprises the following steps of: S1, comparing, analyzing and judging a defect area of the outer covering part based on a defect state of a field part in combination with a CAE (Computer Aided Engineering) model; s2, measuring the defect value of the maximum deformation part of the defect area, wherein the defect value comprises the defect size and the defect depth; s3, according to the defect numerical value, determining a vertex range of male die compensation in combination with a set first proportion value; then determining a global range of male die compensation in combination with a set second proportion value; and S4, according to the vertex range and the global range determined in the step S3, the machining model of the male die is corrected, male die A face compensation is conducted in a curvature continuous mode, and male die machining is completed in a machining mode. According to the die compensation method, male die compensation is achieved through fine modeling and machining, and the defects that manual male die compensation is long in period, high in requirement for the ability of debugging personnel and the like are overcome.

Description

Technical Field

[0001] The invention relates to the field of automobile mold manufacturing, and in particular to a mold compensation method for improving the surface quality of automobile outer covering parts. Background Art

[0002] Automobile exterior covering refers to the surface of the car, which is similar to the surface of human skin, including the overall side panels, fenders, hood outer panels, hood inner panels, trunk outer panels, trunk inner panels, front door outer panels, front inner and outer panels, rear door outer panels, rear door inner panels, top covers and other surface areas. These exterior coverings need to be made by stamping technology. In the manufacturing process of various types of automobiles, an average of about 2,000 sets of stamping dies are required for one model. The manufacturing of parts is inseparable from dies and determines the overall quality of the car. Various dies can be installed on the stamping machine to punch out the corresponding workpieces. The quality of the dies determines the quality of the workpieces. All workpieces need to be stamped and then separated by stamping such as punching, trimming, flanging and other processes to complete the manufacturing.

[0003] At present, in the field of automobile manufacturing, the surface quality requirements for automobile exterior panels are getting higher and higher, especially for some areas with complex surface morphology changes, it is easy to have various pits and other defects on the surface, affecting the appearance of the whole vehicle. A typical example is the position of the side taillights of the car, such as Figure 1 As shown, its shape is complex, with many large-angle bends and deformations, and many changes in characteristic angles. Defects are concentrated at the taillight opening, and this area is often the focus of surface attention. This requires correcting the mold to eliminate the defects.

[0004] When the mold is developed in the early stage and fine digital simulation is performed, it is impossible to estimate the size and depth of the defects in advance. It can only be corrected according to the later on-site debugging, and the corresponding compensation is made in the mold area corresponding to the recessed part of the cover. During the on-site debugging of the mold, the common method for taillight defects is to improve the research and matching status in the drawing and post-process shaping area, or to manually perform punch compensation in the post-process. Manual punch compensation has the disadvantages of long cycle and high requirements on the debugging personnel, and it is difficult to ensure accuracy, which cannot meet the requirements of intelligent and efficient production.

[0005] Therefore, it is necessary to propose a new mold compensation method to improve accuracy and efficiency. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a mold compensation method for improving the surface quality of automobile outer covering parts, so as to solve the problems of long punch compensation cycle and low efficiency in the prior art.

[0007] To achieve the above-mentioned purpose and other related purposes, the present invention provides a mold compensation method for improving the surface quality of an automobile outer covering part, the mold compensation method comprising the following steps:

[0008] S1. Based on the defect status of the on-site parts and the CAE model, comparative analysis is performed to determine the defect area of ​​the outer cover;

[0009] S2. Measure the defect value at the maximum deformation of the defect area, including the defect size and defect depth;

[0010] S3, according to the defect value, combined with the set first ratio value, determine the vertex range of the punch compensation, the first ratio value = defect size / vertex range of the punch compensation; then combine the set second ratio value to determine the full range of the punch compensation, the second ratio value = vertex range of the punch compensation / full range of the punch compensation;

[0011] S4. According to the vertex range and the global range determined in step S3, the processing model of the punch is corrected, the punch A surface is compensated in a curvature continuous manner, and the punch processing is completed by machining.

[0012] Preferably, the outer covering member is at the side taillight.

[0013] Preferably, the first ratio value is 1:10, and the second ratio value is 1:500.

[0014] As described above, the present invention provides a mold compensation method for improving the surface quality of automobile outer covering parts, and the compensation method includes the following steps: S1, based on the defect state of the on-site parts combined with the CAE model, comparative analysis is performed to determine the defect area of ​​the outer covering part; S2, the defect value at the maximum deformation of the defect area is measured, including the defect size and the defect depth; S3, according to the defect value, combined with the set first ratio value, the vertex range of the punch compensation is determined, the first ratio value = defect size / vertex range of the punch compensation; then combined with the set second ratio value, the global range of the punch compensation is determined, the second ratio value = vertex range of the punch compensation / global range of the punch compensation; S4, according to the vertex range and global range determined in step S3, the processing model of the punch is corrected, the punch A surface compensation is performed in a curvature continuous manner, and the punch processing is completed by machining. This mold compensation method is based on the actual defect measurement data on site, combined with theoretical analysis, and realizes punch compensation through fine modeling and machining to improve rectification efficiency. It is especially suitable for areas with complex surface changes such as side panels and taillights, and makes up for the shortcomings of manual punch compensation, such as long cycle and high requirements on the ability of debugging personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is the surface structure of the side taillight.

[0016] Figure 2 Shown is a schematic cross-sectional structure diagram of punch compensation.

[0017] Figure 3 Shown is a top view schematic diagram of the punch compensation structure.

[0018] Component number description

[0019] 11 Vertex range of punch compensation

[0020] 12 Global range of punch compensation

[0021] 100 Punch DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0023] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic view is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0024] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0025] like Figure 1 As shown, the present invention provides a mold compensation method for improving the surface quality of automobile outer covering parts, comprising the following steps:

[0026] S1. Based on the defect status of the on-site parts and the CAE model, comparative analysis is performed to determine the defect area of ​​the outer cover;

[0027] Specifically, the outer covering part can be any area on the surface of the automobile, including but not limited to fenders, hood outer panels, roof and other areas. Since these workpieces are all completed by stamping, they can all be corrected by the method of the present invention, and ultimately eliminate defects and improve surface quality. This embodiment takes the side rear lights as an example, that is, the outer covering part is the side rear lights.

[0028] S2. Measure the defect value at the maximum deformation of the defect area, including the defect size and defect depth;

[0029] Specifically, the surface defect is in the shape of a pit, and the maximum deformation is usually located at the center of the defect area, which is the deepest part of the pit. The defect value should be measured by precision measuring equipment. At the same time, the defect size and defect depth should be measured at least three times, and then the average of multiple measurement results is calculated to obtain the final defect value to avoid excessive errors in a single measurement.

[0030] S3. According to the defect value, Figure 2 , Figure 3 As shown, the vertex range 11 of punch compensation is determined in combination with the set first ratio value, and the first ratio value = defect size / vertex range of punch compensation; then the global range 12 of punch compensation is determined in combination with the set second ratio value, and the second ratio value = vertex range of punch compensation / global range of punch compensation.

[0031] Specifically, since the defect is in the shape of a pit, it must have a lowest point and a certain range area, so it is necessary to determine the vertex range and the full range during the punch compensation according to the defect shape, the vertex range corresponds to the lowest point of the pit, and the full range corresponds to the entire pit. During the punch compensation, a curved convexity is formed on the surface of the punch 100 to correct the surface of the outer cover, so that the surface defects of the outer cover disappear and the smooth state is restored.

[0032] As an example, the defect size is 0.02mm. In fine modeling, the vertex range 11 of the punch compensation is determined to be 0.2mm according to the first ratio of 1:10, that is, the punch compensation range is 0.2mm at the maximum deformation of the defect. According to the compensation value of the vertex range, the whole domain compensation is performed according to the second ratio of 1:500. For example, the vertex range of the punch compensation is 0.2mm, and the whole domain range 12 of the punch compensation is 100mm. That is, the whole domain compensation is performed within the circumference of 100mm with the point of 0.2mm as the center, and the whole domain compensation of the punch is performed with the circumference boundary of the whole domain range as 0 and the curvature continuous.

[0033] It should be understood that the first ratio value and the second ratio value are not fixed values, but need to be adjusted in real time according to the actual on-site part defect conditions. For example, if some defect areas are relatively flat and the deformation area is small, the second ratio value needs to be increased to reduce the corresponding global range of punch compensation; and if some defect areas are relatively steep and the deformation area is large, the second ratio value needs to be reduced to expand the corresponding global range of punch compensation.

[0034] S4. According to the vertex range and the global range determined in step S3, the processing model of the punch is corrected, the punch A surface is compensated in a curvature continuous manner, and the punch processing is completed by machining.

[0035] Specifically, the processing model is directly corrected according to the numerical range determined by S3. Combined with the machining method, the instability of manual processing can be avoided. At the same time, the numerical range is calculated according to the determined proportional value, without the need for repeated measurement and modification, which reduces the difficulty of mold debugging and shortens the time of mold debugging.

[0036] In summary, the present invention provides a mold compensation method for improving the surface quality of automobile outer covering parts, and the compensation method includes the following steps: S1, based on the defect state of the on-site parts combined with the CAE model, comparative analysis is performed to determine the defect area of ​​the outer covering part; S2, the defect value at the maximum deformation of the defect area is measured, including the defect size and the defect depth; S3, according to the defect value, combined with a set first ratio value, the vertex range of punch compensation is determined, the first ratio value = defect size / vertex range of punch compensation; then combined with a set second ratio value, the global range of punch compensation is determined, the second ratio value = vertex range of punch compensation / global range of punch compensation; S4, according to the vertex range and global range determined in step S3, the processing model of the punch is corrected, the punch A surface is compensated in a curvature continuous manner, and the punch processing is completed by machining. This mold compensation method is based on the actual defect measurement data on site, combined with theoretical analysis, and realizes punch compensation through fine modeling and machining to improve rectification efficiency. It is especially suitable for areas with complex surface changes such as side panels and taillights, and makes up for the shortcomings of manual punch compensation, such as long cycle and high requirements on the ability of debugging personnel.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A mold compensation method for improving the surface quality of automobile outer covering parts, characterized in that: The mold compensation method comprises the following steps: S1. Based on the defect status of the on-site parts and the CAE model, comparative analysis is performed to determine the defect area of ​​the outer cover; S2. Measure the defect value at the maximum deformation of the defect area, including the defect size and defect depth; S3, according to the defect value, combined with the set first ratio value, determine the vertex range of the punch compensation, the first ratio value = defect size / vertex range of the punch compensation; then combine the set second ratio value to determine the full range of the punch compensation, the second ratio value = vertex range of the punch compensation / full range of the punch compensation; S4. According to the vertex range and the global range determined in step S3, the processing model of the punch is corrected, the punch A surface is compensated in a curvature continuous manner, and the punch processing is completed by machining.

2. The mold compensation method according to claim 1, characterized in that: The outer covering part is at the side taillight.

3. The mold compensation method according to claim 1, characterized in that: The first ratio value is 1:10, and the second ratio value is 1:500.

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