Manufacturing method of floor drawing piece in two-order character type

Abstract

The invention discloses a manufacturing method of a floor drawing part in a two-order character pattern, and relates to the technical field of automobile die manufacturing, and the manufacturing method comprises the following steps: scanning out the floor drawing part in a stable state, and generating STL (Standard Template Library) data; a target grid is generated through CATIA repair, and the drawing sequence working molded surface is converted into a reference grid; calculating the space position deviation between the reference grid and the target grid in AutoForm, generating a displacement vector field, and exporting the displacement vector field as a TXT format general compensation file; driving a floor drawing sequence working molded surface control point to generate spatial displacement according to the displacement vector field by utilizing CATIA to generate a reverse conformal curved surface; and outputting the curved surface when the normal distance deviation meets a preset condition. According to the method, accurate conversion from the rebound state to the parameterized molded surface is achieved through data interaction, an original curved surface topological structure is reserved, the problem that the molded surface is not attached is solved, the grinding workload of bench workers is reduced, and the mold manufacturing period is shortened.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile die manufacturing, and in particular to a manufacturing method of a floor drawing part in a second-order symbol type. BACKGROUND

[0002] The automobile floor drawing part usually has the characteristics of large size, complex profile and deep drawing depth. After the first-order drawing process is completed, the plate part will inevitably deform due to the release of internal stress, resulting in a spatial deviation between the actual geometric shape of the part and the original theoretical design data. Since the subsequent second-order (OP20) trimming die is usually designed and processed according to the theoretical numerical model, this shape deviation makes the drawing part unable to completely fit the die profile when it is put into the second-order die, resulting in the phenomenon of suspension or local interference of the part on the die.

[0003] In the trimming process, if the part does not fit the die profile well, the plate part will elastically deform, shake or even slightly displace when subjected to the shearing force of the trimming knife block due to the lack of effective support. This working condition directly leads to the trimming line profile deviation, which cannot meet the size precision requirements of product design and seriously affects the assembly quality of the final welded assembly.

[0004] To solve the above-mentioned fitting problem, the existing die manufacturing process mostly adopts the traditional mode of reserving a margin and manually adjusting, that is, a certain amount of metal margin is reserved during die processing, and the die profile is repeatedly colored, polished and adjusted by a toolmaker during assembly and debugging. This physical correction method relying on manual experience not only has high labor intensity and low efficiency, but also seriously delays the manufacturing and delivery cycle of the die, and it is difficult to ensure the uniformity and stability of the die profile precision, so that the high machining precision advantage of the numerical control machine tool cannot be reflected in the final profile.

[0005] Although there are some digital compensation technologies based on reverse engineering at present, that is, point cloud data after springback is obtained by using a scanning device to reconstruct the profile, the existing reconstruction method is mostly based on point cloud data for surface fitting. The surface generated by this fitting method is essentially a geometric approximation of discrete points, which often destroys the topological structure and NURBS mathematical properties of the original CAD data, resulting in poor surface smoothness and discontinuous curvature, which is difficult to directly use for high-precision numerical control light knife processing. In addition, this non-parametric reconstructed surface lacks editability, and when fine tuning or engineering changes are needed, it cannot be quickly modified by adjusting the control points, which limits its application flexibility in industrial production. SUMMARY

[0006] The purpose of this invention is to provide a method for manufacturing floor drawing parts in the second-stage molding process, which solves a technical problem in which the floor drawing parts, after stamping, suffer from low fit with the surface of the second-stage trimming mold due to springback deformation, resulting in insufficient trimming line contour accuracy and a large workload for mold fitting.

[0007] This invention provides the following solution:

[0008] This invention provides a method for manufacturing a second-stage profile for floor-drawn parts. This method uses digital means to reverse-map the springback state of the physically drawn part to the mold design data, directly generating a compensation surface for second-stage trimming mold processing. The manufacturing method includes the following steps:

[0009] Step S1: Confirm that the floor drawing part is in a stable output state, and use a non-contact optical scanning device to scan and fit the floor drawing part to generate STL format scanning data.

[0010] Step S2: Import the STL format scan data into CATIA software and perform repair processing to generate target mesh data; use CATIA software to convert the floor drawing sequence working surface processing data into discrete mesh data to generate reference mesh data.

[0011] Step S3: Import the floor drawing profile tool body data, the target mesh data and the reference mesh data into AutoForm software, calculate the spatial position deviation between the reference mesh data and the target mesh data, generate a displacement vector field and export it as a TXT format general compensation file;

[0012] Step S4: Use the CATIA software to read the TXT format general compensation file, and drive the control points of the floor drawing sequence working surface to undergo spatial displacement according to the displacement vector field, thereby generating the reverse pattern surface;

[0013] Step S5: Use the CATIA software to compare the deviation value of the normal distance between the reverse pattern surface and the target mesh data. When the deviation value of the normal distance meets the preset conditions, output the reverse pattern surface as the second-order pattern data.

[0014] Preferably, in step S1, it is confirmed that the floor drawing part is in a stable output state. Specifically, this involves checking that the surface of the floor drawing part is free of cracks and wrinkles, and confirming that the corresponding mold state has been solidified. The fitting process specifically involves using GOM software to calculate the original data obtained by scanning the floor drawing part using the non-contact optical scanning device, generating triangular facet point cloud data, and transforming the coordinate system of the triangular facet point cloud data to the vehicle design reference body coordinate system.

[0015] Preferably, in step S2, when generating target mesh data, the STL format scan data is imported using the CATIA software digital shape editing module and the repair process is performed. The repair process includes removing abnormal protrusions on the point cloud surface and filling the voids on the data surface, and the processed data is saved as the target mesh data.

[0016] Preferably, in step S2, when generating the reference mesh data, the floor drawing sequence working surface machining data is opened in the CATIA software, and the shape carving module is entered to execute the meshing command. This transforms the floor drawing sequence working surface machining data from a continuous surface into discrete mesh data with the same triangular facet topology as the scanned data. The transformed data is then exported as the reference mesh data. This step ensures that the theoretical data and the measured data have the same geometric expression, meeting the requirements for nodal deviation calculation.

[0017] Preferably, in step S3, when importing the AutoForm software, the floor drawing profile tool body data is imported as a tool body in IGS format; when calculating the spatial position deviation, the compensation interface under the AutoForm software modification module is entered, the reference mesh data is designated as the reference geometry, the target mesh data is designated as the measurement geometry, and the calculation command is executed.

[0018] Preferably, in step S3, when generating the displacement vector field, the tool body is activated in the compensated interface of the AutoForm software, the transition zone setting is deleted to ensure that the entire surface participates in the calculation; the compensation coefficient is set to a preset compensation value so that the mold surface completely conforms to the shape of the deformed part; the smoothness coefficient is set within the preset smoothness value range; the total displacement is selected in the displacement direction option and clicked to apply to generate the displacement vector field. Exporting to a TXT format universal compensation file includes selecting to export compensation data and specifying the file format as TXT to form the TXT format universal compensation file.

[0019] Preferably, in step S4, when generating the reverse-shaped surface, the CATIA software's freeform modeling module is entered to initiate the digital deformation command; the floor drawing sequence working surface is selected as the element to be deformed in the deformation definition area; the TXT format general compensation file is imported in the displacement definition area; the tolerance value is set to a preset tolerance value; and the driving command is executed to cause the control points of the floor drawing sequence working surface to undergo spatial displacement according to the displacement vector field, thereby generating the reverse-shaped surface. The generated reverse surface retains the NURBS mathematical properties and topological structure of the original design, supporting subsequent secondary feature editing.

[0020] Preferably, in step S5, when comparing the normal distance deviation value, the CATIA software distance map analysis function is used to select the reverse shaped surface as the first group of elements and the target mesh data as the second group of elements; the maximum distance value is set to the preset maximum analysis distance, the normal distance between the two groups of data is calculated, and a display deviation value cloud map is generated.

[0021] Preferably, in step S5, satisfying the preset condition means that the distance deviation between the reverse-shaped curved surface and the target mesh data is controlled within a preset qualified threshold. When the distance deviation exceeds the preset qualified threshold, cyclic optimization is performed: return to the compensated interface of the AutoForm software to adjust the smoothing coefficient, recalculate and export a new TXT format universal compensation file, and re-import the new TXT format universal compensation file into the CATIA software to drive the deformation of the floor drawing sequence working surface until the distance deviation stabilizes within the preset qualified threshold.

[0022] Preferably, in step S5, after outputting, the method further includes: using the binary symbol data for OP20 trimming mold processing data design, and using the binary symbol data to perform OP20 sequence surface downmilling.

[0023] This invention utilizes data interaction between CATIA and AutoForm software. The AutoForm algorithm calculates the deviation vector between the theoretical and measured meshes, and CATIA's digital deformation function directly maps this deviation vector to the original CAD surface. This method avoids the problems of poor surface smoothness and inability to perform secondary editing caused by point cloud pavement reconstruction in traditional reverse engineering. It achieves accurate conversion from physical springback state to parametric mold surface, reduces the downmilling process of the OP20 sequence surface, and shortens the mold manufacturing cycle.

[0024] The above solution achieves the following beneficial technical effects:

[0025] This invention reads the general compensation file generated by AutoForm using CATIA software, and directly drives the control points of the original drawing working surface to undergo spatial displacement using the displacement vector field. This method avoids the problems of poor surface smoothness and loss of topology caused by surface reconstruction based on point cloud data in traditional reverse engineering. The generated reverse-shaped surface completely retains the NURBS mathematical properties of the original design and has full editability, which facilitates rapid parametric adjustments during mold debugging or design changes.

[0026] This invention achieves digital compensation for the springback deformation of drawn parts by directly using the precision-verified binary pattern data as the processing data of the OP20 trimming die. Since the reverse profile has a high degree of fit with the actual drawn part and has the smooth continuity required for machining, the CNC machine tool can directly process it to the theoretical net size, avoiding the situation in traditional processes where the profile does not fit and therefore a allowance needs to be reserved. This greatly reduces the workload of subsequent manual grinding and fitting by fitters and effectively shortens the die manufacturing cycle.

[0027] This invention solves the problem of the drawn part being suspended or poorly fitted in subsequent processes by accurately mapping the actual springback state of the floor drawing part onto the surface of the second-stage trimming die. This ensures that the drawn part can be fully supported by the die surface during the trimming process, eliminating the shaking and movement of the part caused by elastic deformation due to gravity or clamping force during the trimming process. This fundamentally guarantees the contour accuracy of the trimming line and improves the finished quality of the final stamped part. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating a method for manufacturing a floor drawing component in a two-dimensional pattern, provided by one or more embodiments of the present invention.

[0029] Figure 2 This is a schematic diagram of deviation detection by comparing scanned data with reversed data according to a specific embodiment of the present invention. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See attached document Figure 1 , Figure 1 This is a flowchart illustrating a method for manufacturing a floor-drawn part in the second-stage molding process according to an embodiment of the present invention. The present invention provides a method for manufacturing a floor-drawn part in the second-stage molding process, applicable to the design stage of automotive mold manufacturing. Specifically, after the floor-drawing process (OP10) is completed, reverse compensation design is performed on the mold surface for the second-stage trimming process (OP20). The method aims to solve the technical problem of misfitting between the drawn part and the subsequent mold surface due to sheet metal springback, thereby affecting trimming accuracy and causing repeated mold modifications.

[0032] The fabrication method for floor drawing parts in the second-order model consists of five sequential processing steps: S1: drawing part status confirmation and data acquisition; S2: data preprocessing based on CATIA software; S3: vector calculation based on AutoForm software; S4: surface reverse engineering driven by CATIA software; and S5: surface accuracy check and output. In the core reverse data fabrication stage, the method utilizes only CATIA and AutoForm software. Seamless interaction between the two software platforms enables surface reconstruction without the need for third-party reverse engineering software. This direct interaction avoids the surface accuracy loss problem caused by multiple data format conversions (such as IGS to STL and then to STP) using third-party software (e.g., Geomagic), ensuring a high degree of consistency between the geometric features of the reverse data and the original design intent. Simultaneously, this process leverages CATIA's powerful surface editing capabilities and AutoForm's precise algorithm analysis capabilities to achieve direct mapping from point cloud data to parametric surfaces, avoiding the cumbersome surface reconstruction process in traditional reverse engineering.

[0033] In the process of confirming the condition of the drawn part and acquiring data, the floor drawn part that has reached a stable output state is used as the physical benchmark. A stable output state refers to a drawn part that has no cracks or wrinkles after forming, and confirms that there is no need for further rectification of the drawing process. Point cloud data of the drawn part surface is acquired using a non-contact ATOS optical scanning device, and optimized fitting is performed using GOM software. The data is then aligned to the vehicle coordinate system and output as scan data in STL format.

[0034] In the data preprocessing step based on CATIA software, the STL format scan data is imported using the CATIA software's Digital Shape Editor module. Abnormal protrusions in the point cloud are smoothed and holes are filled to generate target mesh data. Simultaneously, the meshing command in the CATIA software's Shape Sculptor module is used to convert the original machining data of the drawing sequence working surface into reference mesh data.

[0035] In the vector calculation step based on AutoForm software, a computational environment is constructed that includes a drawing surface tool body, reference mesh data, and target mesh data. The reference mesh data is set as the baseline geometry, and the target mesh data is set as the measurement geometry. The spatial deviation between the two is calculated using the compensation module of AutoForm software. This calculation process generates a displacement vector field describing the deformation from the theoretical surface to the actual springback surface based on preset compensation and smoothing coefficients, and exports the displacement vector field as a generic compensation file (TXT format).

[0036] In the reverse engineering process based on CATIA software, the original drawn CAD surface is used as the deformable element in the freeform modeling module of CATIA. The digital deformation command reads the aforementioned TXT format general compensation file, and based on the displacement amount and direction defined by the displacement vector field, drives the control points of the original CAD surface to undergo spatial displacement, generating the reverse-formed surface.

[0037] In the surface accuracy inspection and output step, the distance cloud map analysis function of CATIA software is used to compare the reverse-formed surface with the target mesh data. When the normal distance deviation between the reverse-formed surface and the target mesh data is less than a preset threshold (e.g., 0.5mm), the reverse-formed surface is deemed qualified and output as the machining data for the OP20 trimming die. This process corrects the surface misfit problem caused by the springback of the drawn part during the design stage, reducing the workload of subsequent fitters in the second-stage die fitting.

[0038] See attached document Figure 1 As the first step in this manufacturing method, the process of confirming the condition of the drawn part and acquiring scanning data provides physical reference data for subsequent reverse engineering.

[0039] First, confirm that the drawn parts are in a stable output state. The specific criteria are: check that the flooring drawn parts, during continuous production, have no surface cracks or wrinkles indicating forming defects. Simultaneously, confirm that the drawing die has no major modifications required and its condition is stable. Under these conditions, select qualified drawn parts as the physical objects for subsequent data collection.

[0040] Subsequently, the qualified drawn workpieces were scanned (photographed) using white light using a non-contact ATOS optical scanning device. After the scanning operation was completed, the raw data obtained from the scan were calculated in the ATOS optical scanning device system to generate triangular facet point cloud data.

[0041] Finally, the generated triangular facet point cloud data was post-processed using GOM software. Specific operations included: performing optimal fitting on the data to improve data quality; transforming the data coordinate system to the vehicle body coordinate system of the overall vehicle design datum to ensure absolute spatial overlap between the actual data obtained from the scan and the theoretical design data in the CAD environment; and saving and exporting the processed data as an STL format file. This STL format file accurately records the geometric morphology of the drawn part in its natural state, serving as the basis for subsequent processing in CATIA software.

[0042] See attached document Figure 1After scanning the drawn part and exporting it as an STL file, the next step is reverse data preprocessing using CATIA software. This step aims to use CATIA software to convert the raw data into the standard mesh format required for subsequent CAE analysis.

[0043] First, the STL file obtained from the scan is repaired and standardized using CATIA software. The CATIA software is launched and the Digital Shape Editing module is accessed. The import function in the Digital Shape Editing module is used to import the STL format scan file generated in the previous stage. Defects in the scanned data are addressed using the editing commands within the Digital Shape Editing module: on the one hand, abnormal protrusions on the point cloud surface are identified and removed; on the other hand, voids on the data surface are filled and repaired. After processing, the repaired data is saved using the export function and defined as target mesh data.

[0044] Secondly, the theoretical machining data of the drawing sequence is converted into a mesh format. The original machining data of the drawing sequence's working surface is opened in CATIA software. Then, the contour carving module is accessed, and the meshing command is executed. Through the meshing command, the drawing sequence's working surface is transformed from a continuous curved surface into discrete mesh data, giving it the same triangular facet topology as the scanned data, thus meeting the data format requirements for AutoForm software to calculate node-to-node deviations. After the conversion is complete, the data is exported and defined as reference mesh data.

[0045] This completes the creation of the target mesh data and reference mesh data, providing the necessary geometric input basis for subsequent vector calculations in the AutoForm software.

[0046] See attached document Figure 1 After preprocessing the mesh data, the deformation vector field is calculated using AutoForm software. This step utilizes software algorithms to calculate the spatial positional deviation between the theoretical mesh and the actual mesh.

[0047] First, launch the AutoForm software and perform the data import operation. Import the raw data of the drawn profile in IGS format as the tool body. Simultaneously, import the target mesh data and reference mesh data in STL format generated in the previous steps. Then, enter the compensation interface under the software's modification module. In this interface, configure the geometric matching settings: specify the imported reference mesh data as the reference geometry and the imported target mesh data as the measurement geometry. After setting, execute the calculation command, and the software will begin calculating the geometric deviation between the two.

[0048] After the calculation is complete, enter the compensated interface. Select the tool body that needs compensation and click "Activate Function". In the parameter setting stage, first delete the default transition zone setting to ensure that the entire surface area participates in the calculation. This avoids the software automatically smoothing the mesh boundaries during the calculation process, thus ensuring that the calculated vector field accurately reflects the actual springback state of the part at the edge of the mold. Next, set the key parameters: set the compensation coefficient to 1 so that the mold surface completely conforms to the actual deformed part shape, that is, apply the full calculated deviation vector without scaling, to achieve 1:1 reverse compensation for the springback deformation; set the smoothness coefficient to 0.5 initially, which can be adjusted as needed within the range of 0.5 to 0.7; in the displacement direction option, select total displacement. After confirming the settings, click "Apply".

[0049] Finally, export the calculation results. Select "Export Compensation Data" and specify the file format as a general compensation file in TXT format. The TXT format general compensation file records the displacement vector data calculated based on the above parameters, serving as the driving source for subsequent steps.

[0050] See attached document Figure 1 After obtaining a general compensation file containing deformation vector information, the original drawing surface is driven by the surface deformation function of CATIA software to generate a reverse-shaped surface.

[0051] First, launch the CATIA software and open the machining data file containing the original drawn surface. Then, enter the Freeform Modeling module and launch the Digital Deformation command within that module.

[0052] In the pop-up command definition interface, make the following settings: In the deformation definition area, click the element to be deformed option, and select the original drawn surface as the editing object in the graphics area. In the displacement definition area under the Deform Element tab, import the TXT format general compensation file (e.g., a file named GenericCompensation.txt) generated by AutoForm in the previous steps. At this time, read and display the relevant displacement data statistics, including the number of points, maximum displacement, minimum displacement, and average displacement value.

[0053] Next, set the accuracy parameters. In the tolerance options at the bottom of the interface, set the value to 0.1mm. This parameter controls the maximum permissible deviation between the deformed surface and the target vector field.

[0054] After completing the above settings, click "OK" to execute the drive. CATIA software, based on the imported deformation vector data and set tolerances, directly drives the deformation of the original drawing surface, thus obtaining second-order reverse engineering data consistent with the actual drawn part's state. Because the second-order reverse engineering data is generated directly from the original CAD parametric surface, rather than a dead surface reconstructed from point clouds, it fully preserves the original design's NURBS mathematical properties and surface topology, possessing complete editability. This overcomes the technical deficiency of traditional reverse engineering where reconstructed surfaces are difficult to edit secondary features. This allows designers to respond quickly during subsequent mold debugging or design changes, requiring only minor parameter adjustments to update and iterate the data.

[0055] When minor changes occur in the product design, designers can quickly update the mold surface by simply adjusting the control points of the original CAD surface based on the new product data or by re-importing the updated vector file, without having to perform point cloud processing and tiling operations again as in traditional reverse engineering methods.

[0056] See attached document Figure 2 After driving the original drawing surface using the digital deformation command, the accuracy of the newly generated reverse profile needs to be verified.

[0057] This step utilizes the distance map analysis function of CATIA software for inspection. In the analysis definition, the reverse profile generated after driven deformation in step four is selected as the first set of elements, and the target mesh data generated in step two (i.e., the scan data representing the actual drawn part) is selected as the second set of elements. In the analysis parameter settings, the maximum distance value is set to 1 mm. Based on this setting, the normal distance between the two sets of data is calculated, and a contour map displaying the deviation value is generated.

[0058] See attached document Figure 2 The values ​​displayed on the contour map (e.g., -0.059mm, 0.036mm, -0.128mm, etc.) represent the deviation between the reverse profile and the actual drawn part at corresponding positions. Positive values ​​indicate that the surface of the actual drawn part protrudes compared to the theoretical design surface, while negative values ​​indicate that the surface of the actual drawn part is concave compared to the theoretical design surface. Operators use the contour map to check the deformation of the entire profile and confirm that the distance deviation between the reverse profile and the target mesh data is controlled within 0.5mm.

[0059] If the inspection results show that the deviation value exceeds the allowable range, or the smoothness of the generated surface does not meet the requirements, optimization adjustments are performed. The operator needs to return to the compensated interface of the AutoForm software and adjust the smoothness coefficient. After adjustment, a new TXT format universal compensation file is recalculated and exported. Subsequently, this new TXT format universal compensation file is re-imported into the digital deformation command of the CATIA software, and the original drawn surface is driven to deform again. The process of adjusting coefficients, exporting vectors, driving deformation, and checking deviations is repeated until the deviation value of the reverse profile stabilizes within 0.5mm while meeting the smoothness requirements. This closed-loop verification process ensures that the final output profile data includes both geometric compensation and the smoothness continuity characteristics required for mold machining.

[0060] Finally, the reverse profile data of the flooring, which has passed accuracy verification, is used as the official data output. This official data is used for the machining data design of the OP20 trimming die for the flooring. Using this official data to process the die reduces one round of downmilling of the OP20 profile, meaning the CNC machine tool can directly machine to the theoretical net size. The fitter only needs to perform simple surface polishing, avoiding the drawbacks of traditional processes where allowances are left due to reluctance to directly machine to the desired size, leading to extensive manual grinding to remove these allowances later. This shortens the fitter's work time and the die manufacturing cycle, achieving a process innovation that moves traditional physical debugging work to the digital design stage. More importantly, this reverse profile ensures that the elastic deformation of the drawn part caused by gravity or clamping force during the OP20 process is fully supported by the die profile, eliminating part vibration and movement during the trimming process, thus guaranteeing the contour accuracy of the trimming line.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of manufacturing a floor draw piece in a two-sequence symbol type, characterized by, The method comprises the following steps: S1, confirming that the floor drawing part is in a stable state, scanning the floor drawing part by using a non-contact optical scanning device, and performing fitting processing to generate STL format scanning data; S2, importing the STL format scanning data into the CATIA software and performing repair processing to generate target grid data, and using the CATIA software to convert the floor drawing sequence working surface machining data into discrete grid data to generate reference grid data; S3, importing the floor drawing surface tool body data, the target grid data and the reference grid data into the AutoForm software, calculating the spatial position deviation between the reference grid data and the target grid data, generating a displacement vector field and exporting it as a TXT format general compensation file; S4, reading the TXT format general compensation file by using the CATIA software, driving the spatial displacement of the floor drawing sequence working surface control point according to the displacement vector field to generate a reverse symbol type surface; S5, comparing the normal distance deviation value of the reverse symbol type surface and the target grid data by using the CATIA software, and outputting the reverse symbol type surface as the second sequence symbol data when the normal distance deviation value meets the preset condition.

2. A method of manufacturing a floor draw according to claim 1, wherein, In step S1, the step of confirming that the floor drawing part is in a stable state comprises checking that there are no cracking defects and wrinkle forming defects on the surface of the floor drawing part, and confirming that the corresponding mold state of the floor drawing part has been solidified; The fitting processing comprises using the GOM software to calculate the triangular facet point cloud data generated from the original data obtained by scanning the floor drawing part by using the non-contact optical scanning device, and transforming the triangular facet point cloud data coordinate system to the vehicle design reference vehicle body coordinate system.

3. A method of manufacturing a floor draw according to claim 1, wherein, In step S2, the step of generating target grid data is specifically: Importing the STL format scanning data into the CATIA software digital profile editing module and performing the repair processing, the repair processing comprising removing the abnormal protruding part of the point cloud surface and filling the data surface hollow position, and saving the processed data as the target grid data.

4. The method of claim 1, wherein the floor draw member is a two-segment symbol. In step S2, the step of generating reference grid data is specifically: Opening the floor drawing sequence working surface machining data in the CATIA software, entering the profile carving module to execute the meshing command, converting the floor drawing sequence working surface machining data from a continuous surface into discrete grid data with the same triangular facet topology structure as the scanning data, and exporting the converted data as the reference grid data.

5. A method of manufacturing a floor draw according to claim 4, wherein, In step S3, the importing into the AutoForm software comprises importing the floor drawing surface tool body data in IGS format as a tool body; The calculation of the spatial position deviation between the reference grid data and the target grid data comprises entering the AutoForm software modification module to modify the compensation interface, specifying the reference grid data as a reference geometry, specifying the target grid data as a measurement geometry, and executing a calculation command.

6. A method of manufacturing a floor draw according to claim 1, wherein, In step S3, the step of generating a displacement vector field is specifically: The AutoForm software has compensated the interface to activate the tool body, delete the transition zone setting, set the compensation coefficient to the preset compensation value, set the smoothing coefficient in the preset smoothing value range, select the total displacement in the displacement direction option, and click Apply to generate the displacement vector field; The export of the TXT format general compensation file includes selecting the compensation data to be exported and specifying the file format as the TXT format, and forming the TXT format general compensation file.

7. A method of manufacturing a floor draw according to claim 1, wherein, In step S4, the step of generating the reverse symbol surface is specifically: Enter the CATIA software free modeling module to start the digital deformation command; In the deformation definition area, select the floor drawing sequence work surface as the element to be deformed; In the displacement definition area, import the TXT format general compensation file; Set the tolerance value to the preset tolerance value; Execute the drive command to make the floor drawing sequence work surface control points have spatial displacement according to the displacement vector field, thereby generating the reverse symbol surface.

8. A method of manufacturing a floor draw according to claim 1, wherein, In step S5, the step of comparing the normal distance deviation value is specifically: Use the CATIA software distance diagram analysis function, select the reverse symbol surface as the first group of elements, and select the target grid data as the second group of elements; Set the maximum distance value to the preset maximum analysis distance, calculate the normal distance between the two groups of data, and generate and display the deviation value cloud diagram.

9. A method of manufacturing a floor draw according to claim 8, wherein, In step S5, the preset condition is that the distance deviation between the reverse symbol surface and the target grid data is controlled within the preset qualified threshold; When the distance deviation exceeds the preset qualified threshold, return to the compensated interface of the AutoForm software to adjust the smoothing coefficient, recalculate and export a new TXT format general compensation file, and reimport the new TXT format general compensation file in the CATIA software to drive the deformation of the floor drawing sequence work surface, until the distance deviation is stable within the preset qualified threshold.

10. A method of manufacturing a floor draw according to claim 1, wherein, In step S5, after the output, the second sequence symbol data is used for OP20 trimming mold machining data design, and the OP20 sequence surface is milled using the second sequence symbol data.

Images