Automobile appearance modeling data review method

Abstract

The invention belongs to the technical field of automobile product design, and particularly relates to an automobile appearance modeling data review method. Capturing a workpiece curved surface as a workpiece reference surface according to the whole-vehicle coordinate of the workpiece, and capturing all the curved surfaces; the curved surface located on the outer contour of the workpiece serves as a contour fillet area, the curved surface located in the outer contour of the workpiece serves as an outer surface area, and the curved surface located outside the outer contour of the workpiece serves as a flanging area; measuring the radius of the curved surface of the contour fillet area, and measuring the curvature radius and the extension straight line angle of the outer surface area; measuring the draft angle of the curved surface of the flanging area; after all measurement is completed, matching a measurement result with an evaluation standard, and judging whether the measurement result reaches the standard or not; according to the method, the mode of manually reviewing the parts one by one and the features one by one in the past can be changed into automatic program review, the review results of all the covering parts and all the modeling features are output at a time, and the working efficiency is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile product design, and in particular relates to a method for reviewing automobile appearance modeling data. Background Art

[0002] During the production and approval process of new vehicle models, the exterior styling data of the vehicle models needs to be reviewed by multiple departments for appearance and processability. The exterior styling data is continuously updated with reference to the review opinions to improve maturity. During the production and approval process of each vehicle model, dozens of versions of exterior styling data will be issued. For each version of styling data, the process department needs to review it; the review content includes more than 10 external covering parts such as hood outer panels, fenders, and side outer panels, and dozens of styling features. The changes must be reviewed again and optimization suggestions must be made. In the past, the review was done manually, which was not only inefficient, but also prone to errors and omissions. Summary of the invention

[0003] In order to overcome the above problems, the present invention provides a method for reviewing automobile appearance styling data; it can transform the previous manual review of each part and each feature into automatic review by program, and output the review results of all covering parts and all styling features at one time, effectively reducing and improving work efficiency.

[0004] A method for reviewing automobile appearance modeling data includes the following contents:

[0005] Step 1: Part capture:

[0006] According to the rule that the workpiece occupies a unique position in the whole vehicle, a set of unique whole vehicle coordinates is set for each workpiece, and the workpiece surface is captured according to the whole vehicle coordinates, and the surface is used as the workpiece reference surface; the process of obtaining the workpiece reference surface is as follows:

[0007] Determine the overlapping area of ​​the same part of different models in the vehicle coordinate system, select a point from the overlapping area, and draw a straight line along the X direction, Y direction or Z direction of the vehicle coordinate system based on the point. The straight line intersects with the surface in the CAS data of the part, and the surface where the intersection point is located is taken as the reference surface of the hood outer panel;

[0008] Step 2: Surface expansion:

[0009] Based on the workpiece reference surface obtained in step 1, the surface is expanded by judging the distance between surfaces, tangent continuity, and angle between surfaces until all surfaces of the entire workpiece are captured;

[0010] Step 3: Surface partitioning

[0011] According to the positional relationship between all the captured curved surfaces and the outer contour of the workpiece, all the expanded curved surfaces are divided into zones. The curved surfaces on the outer contour of the workpiece are used as the contour fillet zone, the curved surfaces inside the outer contour of the workpiece are used as the outer surface zone, and the curved surfaces outside the outer contour of the workpiece are used as the flanging zone.

[0012] Step 4: Contour fillet area measurement

[0013] The radius of the curved surface in the contour fillet area is measured, wherein points are evenly distributed on the outer contour of the workpiece in the contour fillet area, and the curvature radius of each point is measured; the points are segmented according to the range of the curvature radius, and the points with curvature radii in a similar range are divided into a section of the curved surface area, and the curvature radius of the points in each section of the curved surface area is averaged as the curvature radius of the corresponding curved surface area;

[0014] Step 5: External surface area measurement

[0015] Curvature radius measurement: extract the outer contour of the outer surface area as a whole as the outer contour of the outer surface area, evenly distribute points on the outer contour of the outer surface area, measure the curvature radius of each point, divide the points into segments according to the range of the curvature radius, divide the points with curvature radii in a similar range into a section of the surface area, and take the average of the curvature radii of the points in each section of the surface area as the curvature radius of the corresponding surface area;

[0016] Extended straight line angle measurement: connect adjacent points in each section of the surface area into a curve, make tangents to the curve based on the two end points of the curve, and the angle between the two tangents is the extended straight line angle of the corresponding surface area; similarly, take the average of the angles of the extended straight lines where the points in each section of the surface area are located as the extended straight line angle of the corresponding surface;

[0017] Step 6, measuring the draft angle of the curved surface of the flange area;

[0018] Points are arranged on each curved surface in the flange area, and the normal plane of the flange area boundary line where the points are made is used as the intersection line between the curved surface where the points are located and the normal plane. The two end points of the intersection line are connected as the draft line; the angle between the draft line and the reference line is measured as the draft angle of the point arrangement;

[0019] The points with similar draft angles are divided into a segment of the surface area, and the average draft angle of the points in each segment of the surface area is taken as the draft angle of the segment of the surface;

[0020] Step 7: Results review

[0021] After all measurements are completed, all measurement results obtained in steps 4-6 are displayed through drawings, and the measurement results are matched with the evaluation criteria to determine whether the measurement results meet the criteria.

[0022] In the step 1, a straight line is drawn in one of the three directions of XYZ based on the point, wherein the selection of the three directions of XYZ is determined according to the position characteristics of the workpiece.

[0023] The step 4 is achieved by calling the CATIA uniform point distribution function and measurement tools.

[0024] The step 5 is implemented by calling the CATIA extraction function, the uniform point distribution function and the curvature measurement function.

[0025] The reference line in step 6 is: the X-axis, Y-axis or Z-axis in the vehicle coordinate system is selected as the reference line according to the position characteristics of the workpiece on the vehicle body.

[0026] The reference line of the hood and the top cover is the Z axis, the reference line of the side panels, the fenders and the door outer panels is the Y axis, and the reference line of the luggage box is the X axis.

[0027] Beneficial effects of the present invention:

[0028] The present invention can output the review results of all covers and all modeling features at one time, effectively reducing and improving work efficiency.

[0029] The present invention can save 24 man-days / vehicle hours and avoid errors and omissions in the review process, greatly reducing the possibility of serious process problems caused by the review. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without creative work.

[0031] Figure 1 CAS data schematic diagram of the product of the present invention.

[0032] Figure 2 It is a schematic diagram of the process of obtaining a curved surface at a partial position on a workpiece of the present invention.

[0033] Figure 3 This is a schematic diagram of all the curved surfaces obtained at some locations of the present invention.

[0034] Figure 4 It is a schematic diagram of partial surface correction according to the present invention.

[0035] Figure 5 This is a schematic diagram of extracting the outer contour of a part of the workpiece according to the present invention.

[0036] Figure 6This is a schematic diagram of extracting curvature of a part of a workpiece according to the present invention.

[0037] Figure 7 It is a schematic diagram of the present invention for checking the curvature of a partial captured surface on a workpiece.

[0038] Figure 8 It is a schematic diagram of measuring the radius and angle of a portion of a workpiece that fails the curvature inspection according to the present invention.

[0039] Fig. 9 Schematic diagram of the curved surface radius of the present invention.

[0040] Fig.10 Schematic diagram of the draft angle of the present invention.

[0041] Fig.11 The present invention is a schematic diagram of converting the corresponding relationship between the measured value and the part onto a plane drawing. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] Example 1

[0047] A method for reviewing automobile appearance modeling data includes the following contents:

[0048] Step 1: Part capture:

[0049] According to the rule that the parts occupy a unique position in the vehicle, the position of each part in the vehicle coordinate system is summarized regularly, and a unique set of vehicle coordinates (coordinates are configurable) is set for each part. The program captures the part surface according to the vehicle coordinates and uses the surface as the part reference surface; the process of obtaining the part reference surface is as follows:

[0050] Determine the overlapping area of ​​the same part of different models in the vehicle coordinate system, select a point from the overlapping area, and draw a straight line along the X direction, Y direction or Z direction of the vehicle coordinate system based on the point. The straight line intersects with the surface in the CAS data of the part, and the surface where the intersection point is located is taken as the reference surface of the hood outer panel;

[0051] (Call CATIA to create points and intersect to obtain the reference surface, for example, the hood outer panel: based on the vehicle coordinate system, make a point with coordinates of X=1400mm, Y=-50mm, Z=0mm, and make a Z-direction straight line based on this point. The straight line intersects with the curved surface, and the curved surface where the intersection is located is taken. This curved surface is the reference surface of the hood outer panel); determine the direction of the straight line according to the position characteristics of the workpiece

[0052] Step 2: Surface expansion:

[0053] Based on the workpiece reference surface obtained in step 1, the surface is expanded by judging the distance between surfaces, tangent continuity, and angle between surfaces until all surfaces of the entire workpiece are captured (for example, the hood outer plate: based on the hood outer plate reference surface, the surface is expanded until all surfaces of the hood outer plate are captured);

[0054] Step 3: Surface partitioning

[0055] According to the positional relationship between all the captured curved surfaces and the outer contour of the workpiece, all the expanded curved surfaces are divided into zones. The curved surfaces on the outer contour of the workpiece are used as the contour fillet zone, the curved surfaces inside the outer contour of the workpiece are used as the outer surface zone, and the curved surfaces outside the outer contour of the workpiece are used as the flanging zone.

[0056] Step 4: Contour fillet area measurement

[0057] The radius of the curved surface in the contour fillet area is measured, where points are evenly distributed on the outer contour of the workpiece in the contour fillet area, and the program automatically measures the curvature radius of each point; the points are segmented according to the range of the curvature radius, and the points with curvature radii in a similar range are divided into a section of the surface area, and the average of the curvature radii of the points in each section of the surface area is taken as the curvature radius of the corresponding surface area;

[0058] Step 5: External surface area measurement

[0059] Measure the radius and angle of the small curvature area on the outer contour of the workpiece in the outer surface area, as well as the radius and angle of the small curvature surface in the outer surface area; the specific contents are as follows:

[0060] Curvature radius measurement: extract the outer contour of the outer surface area as a whole as the outer contour of the outer surface area, evenly distribute points on the outer contour of the outer surface area, measure the curvature radius of each point, divide the points into segments according to the range of the curvature radius, divide the points with curvature radii in a similar range into a section of the surface area, and take the average of the curvature radii of the points in each section of the surface area as the curvature radius of the corresponding surface area;

[0061] Extended straight line angle measurement: connect adjacent points in each section of the surface area into a curve, make tangents to the curve based on the two end points of the curve, and the angle between the two tangents is the extended straight line angle of the corresponding surface area; similarly, take the average of the angles of the extended straight lines where the points in each section of the surface area are located as the extended straight line angle of the corresponding surface;

[0062] Step 6, measuring the draft angle of the curved surface of the flange area;

[0063] Points are arranged on each curved surface in the flange area, and the normal plane of the flange area boundary line where the points are made is used as the intersection line between the curved surface where the points are located and the normal plane. The two end points of the intersection line are connected as the draft line; the angle between the draft line and the reference line is measured as the draft angle of the point arrangement;

[0064] The points with similar draft angles are divided into a segment of the surface area, and the average draft angle of the points in each segment of the surface area is taken as the draft angle of the segment of the surface;

[0065] Step 7: Results review

[0066] After all measurements are completed, all measurement results obtained in steps 4-6 are displayed through drawings, and the measurement results are manually matched with the evaluation criteria to determine whether the measurement results meet the standards.

[0067] 8. Output results

[0068] According to the given template, output the change suggestion review form for the unqualified review items.

[0069] In the step 1, a straight line is drawn in one of the three directions of XYZ based on the point, wherein the selection of the three directions of XYZ is determined according to the position characteristics of the workpiece.

[0070] The step 4 is achieved by calling the CATIA uniform point distribution function and measurement tools.

[0071] The step 5 is implemented by calling the CATIA extraction function, the uniform point distribution function and the curvature measurement function.

[0072] The reference line in step 6 is: select the X-axis, Y-axis or Z-axis in the vehicle coordinate system as the reference line according to the position characteristics of the workpiece on the vehicle body. Hood, top cover: Z-axis, side panels, fenders, door panels: Y-axis, luggage compartment: X-axis.

[0073] Example 2

[0074] 1. According to the rule that the parts occupy a unique position in the vehicle, the position of each part in the vehicle coordinate system is summarized regularly, and a unique set of vehicle coordinates is set for each part (the coordinates are configurable). The program captures the part surface based on the vehicle coordinates and uses the surface as the part reference surface, such as Figure 1-2 ;

[0075] 2. Based on the distance and angle relationship between the captured surface and the surrounding surfaces, the surface is expanded until all surfaces of the entire cover are captured, such as Figure 3 ;

[0076] 3. According to the positional relationship between all the captured surfaces and the outer contour of the workpiece, all the expanded surfaces are divided into zones. The surfaces on the outer contour of the workpiece are used as the contour fillet zone, the surfaces inside the outer contour of the workpiece are used as the outer surface zone, and the surfaces outside the outer contour of the workpiece are used as the flanging zone. Figure 4 ;

[0077] 4. Extract the overall outer contour of the outer surface area and check the curvature of the contour. When the curvature of a point / area is less than the reference value, the location is determined to be a modeling feature that needs to be reviewed, and the radius and angle are measured and reviewed. Figure 5-6 ;

[0078] 5. Check the curvature of all external surface areas. When the minimum curvature of a surface is less than the reference value, the surface is determined to be a modeling feature that needs to be reviewed, and the radius and angle are measured and reviewed. Figure 7-8 ;

[0079] 6. Check the radius of the flange fillet area, arrange points on the surface of the flange fillet area, make the normal plane between the point and the flange contour, and make the intersection line between the plane and the surface. Measure the radius of the intersection line as the radius of the flange fillet surface, divide the points with similar radii into a section of the surface area, and take the average of the radius of the points in each section of the surface area as the radius of the section of the surface, such as Fig. 9 ;

[0080] 7. Measure the draft angle of the flanging area. Place points on each curved surface in the flanging area. Make a normal plane of the flanging area boundary line with the points. Make an intersection line with the curved surface where the points are located and the normal plane. Connect the two end points of the intersection line as the draft line. Measure the angle between the draft line and the reference line as the draft angle of the point.

[0081] The points with similar draft angles are divided into a surface area, and the average draft angle of the points in each surface area is taken as the draft angle of the surface segment, such as Fig.10 ;

[0082] 6. Convert all the measurements and parts correspondence into the plane drawing, such as Fig.11 ;

[0083] 7. After all measurement values ​​are matched with the corresponding review standards, the software will conduct a review. If the standard value requirements are not met, a review question sheet will be output.

[0084] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope of the present invention.

[0085] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0086] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for reviewing automobile appearance data, characterized in that: It includes the following: Step 1: Part capture: According to the rule that the workpiece occupies a unique position in the whole vehicle, a set of unique whole vehicle coordinates is set for each workpiece, and the workpiece surface is captured according to the whole vehicle coordinates, and the surface is used as the workpiece reference surface; the process of obtaining the workpiece reference surface is as follows: Determine the overlapping area of ​​the same part of different models in the vehicle coordinate system, select a point from the overlapping area, and draw a straight line along the X direction, Y direction or Z direction of the vehicle coordinate system based on the point. The straight line intersects with the surface in the CAS data of the part, and the surface where the intersection point is located is taken as the reference surface of the hood outer panel; Step 2: Surface expansion: Based on the workpiece reference surface obtained in step 1, the surface is expanded by judging the distance between surfaces, tangent continuity, and angle between surfaces until all surfaces of the entire workpiece are captured; Step 3: Surface partitioning According to the positional relationship between all the captured curved surfaces and the outer contour of the workpiece, all the expanded curved surfaces are divided into zones. The curved surfaces on the outer contour of the workpiece are used as the contour fillet zone, the curved surfaces inside the outer contour of the workpiece are used as the outer surface zone, and the curved surfaces outside the outer contour of the workpiece are used as the flanging zone. Step 4: Contour fillet area measurement The radius of the curved surface in the contour fillet area is measured, wherein points are evenly distributed on the outer contour of the workpiece in the contour fillet area, and the curvature radius of each point is measured; the points are segmented according to the range of the curvature radius, and the points with curvature radii in a similar range are divided into a section of the curved surface area, and the curvature radius of the points in each section of the curved surface area is averaged as the curvature radius of the corresponding curved surface area; Step 5: External surface area measurement Curvature radius measurement: extract the outer contour of the outer surface area as a whole as the outer contour of the outer surface area, evenly distribute points on the outer contour of the outer surface area, measure the curvature radius of each point, divide the points into segments according to the range of the curvature radius, divide the points with curvature radii in a similar range into a section of the surface area, and take the average of the curvature radii of the points in each section of the surface area as the curvature radius of the corresponding surface area; Extended straight line angle measurement: connect adjacent points in each section of the surface area into a curve, make tangents to the curve based on the two end points of the curve, and the angle between the two tangents is the extended straight line angle of the corresponding surface area; similarly, take the average of the angles of the extended straight lines where the points in each section of the surface area are located as the extended straight line angle of the corresponding surface; Step 6, measuring the draft angle of the curved surface of the flange area; Points are arranged on each curved surface in the flange area, and the normal plane of the flange area boundary line where the points are made is used as the intersection line between the curved surface where the points are located and the normal plane. The two end points of the intersection line are connected as the draft line; the angle between the draft line and the reference line is measured as the draft angle of the point arrangement; The points with similar draft angles are divided into a segment of the surface area, and the average draft angle of the points in each segment of the surface area is taken as the draft angle of the segment of the surface; Step 7: Results review After all measurements are completed, all measurement results obtained in steps 4-6 are displayed through drawings, and the measurement results are matched with the evaluation criteria to determine whether the measurement results meet the criteria.

2. The method for reviewing automobile appearance data according to claim 1, characterized in that: In the step 1, a straight line is drawn in one of the three directions of XYZ based on the point, wherein the selection of the three directions of XYZ is determined according to the position characteristics of the workpiece.

3. The method for reviewing automobile appearance data according to claim 1, characterized in that: The step 4 is achieved by calling the CATIA uniform point distribution function and measurement tools.

4. The method for reviewing automobile appearance data according to claim 1, characterized in that: The step 5 is implemented by calling the CATIA extraction function, the uniform point distribution function and the curvature measurement function.

5. The method for reviewing automobile appearance data according to claim 1, characterized in that: The reference line in step 6 is: the X-axis, Y-axis or Z-axis in the vehicle coordinate system is selected as the reference line according to the position characteristics of the workpiece on the vehicle body.

6. The method for reviewing automobile appearance data according to claim 1, characterized in that: The reference line of the hood and the top cover is the Z axis, the reference line of the side panels, the fenders and the door outer panels is the Y axis, and the reference line of the luggage box is the X axis.

7. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the automobile appearance modeling data review method as described in any one of claims 1-6 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the automobile appearance modeling data review method as described in any one of claims 1-6 is implemented.

Images