A car luggage rack design method and terminal based on CATIA

Abstract

The present invention discloses a CATIA-based automobile luggage rack design method and terminal, first extracting an isoparametric curve on the top surface of the luggage rack and extending the surface, making a vertical line perpendicular to the extended surface and up to a first preset length through the first end point of the isoparametric curve, taking the first end point as the starting point, intercepting a line segment up to a second preset length along the isoparametric curve to obtain an intercepted curve, extending an end point on the same side of the intercepted curve as the first end point along the curvature direction by a third preset length to obtain an extended end point, establishing a first sample curve that is a tangent curve to the intercepted curve with the extended end point and an end of the vertical line away from the first end point as two end points, repeatedly obtaining a second sample curve, integrating to obtain a final sample curve, thereby sweeping the main section of the luggage rack. The present invention adjusts the first preset length, the second preset length, and the third preset length so that the luggage rack maintains a uniform gap with the side panel metal and the roof panel metal and meets the requirements of the equal section process, thereby accelerating the project progress.

Description

Technical Field

[0001] The invention relates to the field of automobile component manufacturing, and in particular to a CATIA-based automobile luggage rack design method and terminal. Background Art

[0002] Nowadays, car roof racks are generally divided into split type and integrated type according to the classification of parts. Among them, the material of integrated luggage racks is usually aluminum, which is processed through extrusion, bending, sawing, surface treatment, assembly and other processes. When an automobile industry company is developing a new car, all parts will be designed and structured at the same time. However, the current market competition is becoming increasingly fierce, and major automobile industry companies are shortening the automobile design and development cycle to meet the needs of rapid renewal of market models. Therefore, many automobile companies will freeze data in batches according to the length of the mold opening cycle of different parts. In particular, parts such as large body sheet metal parts with large size and long mold opening cycle are the first batch to be frozen among all parts.

[0003] like Figure 2 As shown, the roof sheet metal 1 and the side panel sheet metal 2 are large-sized sheet metal parts, and the molding analysis and mold processing cycle are long. Therefore, the data of the roof sheet metal 1 and the side panel sheet metal 2 need to be frozen before the luggage rack 3 to ensure the schedule of vehicle development.

[0004] In order to ensure that the vehicle development schedule will not be exceeded, the side and roof sheet metal data will be frozen in advance. Even if the modification is made, it will only be a local fine-tuning. However, the luggage rack is an extrusion molding process. Due to process limitations, it is necessary to ensure that the luggage rack has a uniform cross-section. At the same time, the luggage rack is designed to have a uniform gap with the side and roof sheet metal. Therefore, when the data is frozen in advance, it is more difficult to optimize the design of the luggage rack, which affects the project progress. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a CATIA-based automobile luggage rack design method and terminal, which can conveniently make the luggage rack meet the requirements of equal-section process while maintaining a uniform gap with the side panel sheet metal and the roof panel sheet metal, thereby accelerating the project progress.

[0006] In order to solve the above problems, the solution adopted by the present invention is:

[0007] A CATIA-based automobile luggage rack design method comprises the following steps:

[0008] S1. Complete the design of the main section of the luggage rack on the structural model consisting of the roof sheet metal, the side panel sheet metal and the luggage rack, and keep the distance between the luggage rack and the roof sheet metal and the distance between the luggage rack and the side panel sheet metal equal;

[0009] S2, extracting isoparametric curves of the top surface of the luggage rack;

[0010] S3, establishing an extension surface of the isoparametric curve in the height direction of the vehicle;

[0011] S4, drawing a vertical line perpendicular to the extended curved surface and having a first preset length through the first end point of the isoparametric curve;

[0012] S5, taking the first endpoint as a starting point, intercepting a line segment of a second preset length along the isoparametric curve to obtain an intercepted curve;

[0013] S6, extending an end point on the intercepted curve on the same side as the first end point by a third preset length in the curvature direction to obtain an extended end point, and establishing a first sample curve that is tangent to the intercepted curve with the extended end point and an end of the perpendicular line away from the first end point as two end points;

[0014] S7, performing the same steps S2 to S6 as for the first endpoint on the second endpoint of the isoparametric curve to obtain a second sample curve;

[0015] S8. Integrate the extended curve, the first sample curve and the second sample curve to obtain a final sample curve, and use the final sample curve to sweep the main section of the luggage rack, by adjusting the values ​​of the first preset length, the second preset length and the third preset length until the new luggage rack satisfies the equal spacing between the luggage rack and the roof sheet metal and the spacing between the luggage rack and the side panel sheet metal.

[0016] In order to solve the above problems, the solution adopted by the present invention is:

[0017] A CATIA-based automobile luggage rack design terminal includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented:

[0018] S1. Complete the design of the main section of the luggage rack on the structural model consisting of the roof sheet metal, the side panel sheet metal and the luggage rack, and keep the distance between the luggage rack and the roof sheet metal and the distance between the luggage rack and the side panel sheet metal equal;

[0019] S2, extracting isoparametric curves of the top surface of the luggage rack;

[0020] S3, establishing an extension surface of the isoparametric curve in the height direction of the vehicle;

[0021] S4, drawing a vertical line perpendicular to the extended curved surface and having a first preset length through the first end point of the isoparametric curve;

[0022] S5, taking the first endpoint as a starting point, intercepting a line segment of a second preset length along the isoparametric curve to obtain an intercepted curve;

[0023] S6, extending an end point on the intercepted curve on the same side as the first end point by a third preset length in the curvature direction to obtain an extended end point, and establishing a first sample curve that is tangent to the intercepted curve with the extended end point and an end of the perpendicular line away from the first end point as two end points;

[0024] S7, performing the same steps S2 to S6 as for the first endpoint on the second endpoint of the isoparametric curve to obtain a second sample curve;

[0025] S8. Integrate the extended curve, the first sample curve and the second sample curve to obtain a final sample curve, and use the final sample curve to sweep the main section of the luggage rack, by adjusting the values ​​of the first preset length, the second preset length and the third preset length until the new luggage rack satisfies the equal spacing between the luggage rack and the roof sheet metal and the spacing between the luggage rack and the side panel sheet metal.

[0026] In summary, the beneficial effects of the present invention are: providing a CATIA-based automobile luggage rack design method and terminal, constructing isoparametric curves and extended surfaces derived from the top surface of the luggage rack on a structural model composed of a roof sheet metal, a side panel sheet metal and a luggage rack, and designing a first sample curve and a second sample curve at both ends of the extended curve by setting a vertical line, intercepting a line segment and other operations, obtaining a final sample curve and using it to sweep the main section of the luggage rack, thereby realizing rapid optimization of the luggage rack modeling data. Specifically, by adjusting the three values ​​of the first preset length, the second preset length and the third preset length, the luggage rack can be easily made to meet the requirements of the equal-section process while maintaining a uniform gap with the side panel sheet metal and the roof panel metal, thereby accelerating the project progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the steps of a method for designing a luggage rack for an automobile based on CATIA in this embodiment;

[0028] Figure 2 Schematic diagram of extraction results of isoparametric curves on a structural model of a method for designing a luggage rack for an automobile based on CATIA in this embodiment;

[0029] Figure 3 A schematic cross-sectional view of the installation position of a luggage rack in a method for designing a luggage rack for an automobile based on CATIA in this embodiment;

[0030] Figure 4It is a schematic diagram of the extension results of isoparametric curves on the structural model of a luggage rack in a method for designing a luggage rack for an automobile based on CATIA in this embodiment;

[0031] Figure 5 is a structural schematic diagram of an extended surface of a CATIA-based automobile luggage rack design method of this embodiment;

[0032] Figure 6 A schematic diagram of the construction effect of the vertical line of a luggage rack in a method for designing a luggage rack for an automobile based on CATIA in this embodiment;

[0033] Figure 7 This is a schematic diagram of a result after the intercepted curve of the luggage rack is removed in a method for designing a luggage rack of an automobile based on CATIA in this embodiment;

[0034] Figure 8 It is a schematic diagram of the construction result of the first sample curve of the luggage rack of a method for designing a luggage rack for an automobile based on CATIA in this embodiment;

[0035] Fig. 9 The system block diagram of a CATIA-based automobile luggage rack design terminal of this embodiment.

[0036] Description of labels:

[0037] 1. Roof sheet metal; 2. Side panel sheet metal; 3. Luggage rack; 4. A car luggage rack design terminal based on CATIA; 5. Memory; 6. Processor. DETAILED DESCRIPTION

[0038] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0039] Please refer to Figures 1 to 8 , a CATIA-based automobile luggage rack design method includes the following steps:

[0040] S1. Complete the design of the main section of the luggage rack on the structural model consisting of the roof sheet metal 1, the side panel sheet metal 2 and the luggage rack 3, and keep the distance between the luggage rack 3 and the roof sheet metal 1 and the distance between the luggage rack 3 and the side panel sheet metal 2 equal;

[0041] S2, extracting the isoparametric curve of the top surface of the luggage rack 3;

[0042] S3, establishing an extension surface of the isoparametric curve in the height direction of the vehicle;

[0043] S4, drawing a vertical line perpendicular to the extended curved surface and having a first preset length through the first end point of the isoparametric curve;

[0044] S5, taking the first endpoint as a starting point, intercepting a line segment of a second preset length along the isoparametric curve to obtain an intercepted curve;

[0045] S6, extending an end point on the intercepted curve on the same side as the first end point by a third preset length in the curvature direction to obtain an extended end point, and establishing a first sample curve that is tangent to the intercepted curve with the extended end point and an end of the perpendicular line away from the first end point as two end points;

[0046] S7, performing the same steps S2 to S6 as for the first endpoint on the second endpoint of the isoparametric curve to obtain a second sample curve;

[0047] S8. Integrate the extended curve, the first sample curve and the second sample curve to obtain a final sample curve, and use the final sample curve to sweep the main section of the luggage rack 3, by adjusting the values ​​of the first preset length, the second preset length and the third preset length until the new luggage rack 3 satisfies the equal spacing between the luggage rack 3 and the roof sheet metal 1 and the spacing between the luggage rack 3 and the side panel sheet metal 2.

[0048] From the above description, it can be seen that the beneficial effects of the present invention are: providing a CATIA-based automobile luggage rack 3 design method, constructing isoparametric curves and extended surfaces derived from the top surface of the luggage rack 3 on a structural model composed of a roof sheet metal 1, a side panel sheet metal 2 and a luggage rack 3, and designing a first sample curve and a second sample curve at both ends of the extended curve by setting a vertical line, intercepting a line segment and other operations, obtaining a final sample curve and using it to sweep the main section of the luggage rack 3, thereby realizing rapid optimization of the modeling data of the luggage rack 3. Specifically, by adjusting the three values ​​of the first preset length, the second preset length and the third preset length, the luggage rack 3 can be easily made to meet the requirements of the equal-section process while maintaining a uniform gap with the side panel sheet metal 2 and the roof sheet metal 1, thereby accelerating the project progress.

[0049] Furthermore, the step S3 is specifically as follows:

[0050] The isoparametric curve is stretched by a fourth preset length along the height direction of the vehicle to obtain the extended curved surface.

[0051] From the above description, it can be seen that the isoparametric curve is extended along the height direction of the car to quickly and accurately establish the extended surface.

[0052] Furthermore, after step S2 and before step S3, the following steps are further included:

[0053] The first endpoint of the isoparametric curve is extended by a preset distance along the curvature direction.

[0054] From the above description, it can be seen that extending the endpoints of the isoparametric curve by a preset distance in the direction of curvature eliminates redundant space for modeling design, so as to better perform subsequent curve extension operations.

[0055] Furthermore, the value range of the first preset length is -10 mm to 10 mm;

[0056] The direction in which the first end point is close to the side panel metal 2 is the positive direction, and the direction in which the first end point is close to the roof panel metal 1 is the negative direction.

[0057] From the above description, it can be seen that the value of the first preset length determines the direction and length of the vertical line to achieve an optimized design of the left and right swing of the end of the luggage rack 3, thereby helping to quickly optimize the shape of the luggage rack 3.

[0058] Furthermore, the second preset length has a value range of 600 mm to 1000 mm.

[0059] From the above description, it can be seen that the second preset length controls the length range of the intercepted curve to cooperate with the value of the third preset length to achieve the adjustment of the tensile bending rate of the end of the luggage rack 3.

[0060] Furthermore, the third preset length has a value range of 200 mm to 400 mm.

[0061] From the above description, it can be seen that the third preset length determines the extension distance of the endpoint of the remaining isoparametric curve after being intercepted, so as to cooperate with the value of the second preset length to quickly complete the optimization of the shape of the luggage rack 3.

[0062] Please refer to Fig. 9 A CATIA-based automobile luggage rack design terminal 4 includes a memory 5, a processor 6, and a computer program stored in the memory 5 and executable on the processor 6. When the processor 6 executes the program, the following steps are implemented:

[0063] S1. Complete the design of the main section of the luggage rack on the structural model consisting of the roof sheet metal 1, the side panel sheet metal 2 and the luggage rack 3, and keep the distance between the luggage rack 3 and the roof sheet metal 1 and the distance between the luggage rack 3 and the side panel sheet metal 2 equal;

[0064] S2, extracting the isoparametric curve of the top surface of the luggage rack 3;

[0065] S3, establishing an extension surface of the isoparametric curve in the height direction of the vehicle;

[0066] S4, drawing a vertical line perpendicular to the extended curved surface and having a first preset length through the first end point of the isoparametric curve;

[0067] S5, taking the first endpoint as a starting point, intercepting a line segment of a second preset length along the isoparametric curve to obtain an intercepted curve;

[0068] S6, extending an end point on the intercepted curve on the same side as the first end point by a third preset length in the curvature direction to obtain an extended end point, and establishing a first sample curve that is tangent to the intercepted curve with the extended end point and an end of the perpendicular line away from the first end point as two end points;

[0069] S7, performing the same steps S2 to S6 as for the first endpoint on the second endpoint of the isoparametric curve to obtain a second sample curve;

[0070] S8. Integrate the extended curve, the first sample curve and the second sample curve to obtain a final sample curve, and use the final sample curve to sweep the main section of the luggage rack 3, by adjusting the values ​​of the first preset length, the second preset length and the third preset length until the new luggage rack 3 satisfies the equal spacing between the luggage rack 3 and the roof sheet metal 1 and the spacing between the luggage rack 3 and the side panel sheet metal 2.

[0071] From the above description, it can be seen that the beneficial effects of the present invention are: providing a CATIA-based automobile luggage rack 3 design method and a terminal thereof, constructing isoparametric curves and extended surfaces derived from the top surface of the luggage rack 3 on a structural model composed of a roof sheet metal 1, a side panel sheet metal 2 and a luggage rack 3, and designing a first sample curve and a second sample curve at both ends of the extended curve by setting a vertical line, intercepting a line segment and other operations, obtaining a final sample curve and using it to sweep the main section of the luggage rack 3, thereby realizing rapid optimization of the modeling data of the luggage rack 3. Specifically, by adjusting the three values ​​of the first preset length, the second preset length and the third preset length, the luggage rack 3 can be easily made to meet the requirements of the equal-section process while maintaining a uniform gap with the side panel sheet metal 2 and the roof sheet metal 1, thereby accelerating the progress of the project.

[0072] Furthermore, the step S3 is specifically as follows:

[0073] Extending the isoparametric curve as a whole along the height direction of the vehicle by a fourth preset length to obtain a boundary curve;

[0074] The plane enclosed by the boundary curve and the original isoparametric curve is used as the extended curved surface.

[0075] From the above description, it can be seen that the isoparametric curve is extended along the height direction of the car to quickly and accurately establish the extended surface.

[0076] Furthermore, after step S2 and before step S3, the following steps are further included:

[0077] The first endpoint of the isoparametric curve is extended by a preset distance along the curvature direction.

[0078] From the above description, it can be seen that extending the endpoints of the isoparametric curve by a preset distance in the direction of curvature eliminates redundant space for modeling design, so as to better perform subsequent curve extension operations.

[0079] Furthermore, the value range of the first preset length is -10 mm to 10 mm;

[0080] The direction in which the first end point is close to the side panel metal 2 is the positive direction, and the direction in which the first end point is close to the roof panel metal 1 is the negative direction.

[0081] From the above description, it can be seen that the value of the first preset length determines the direction and length of the vertical line to achieve an optimized design of the left and right swinging of the end of the luggage rack 3, thereby helping to quickly complete the optimization of the luggage rack 3.

[0082] Please refer to Figures 1 to 8 , Embodiment 1 of the present invention is:

[0083] A method for designing a luggage rack based on CATIA is applicable to situations where the data of the roof sheet metal 1 and the side panel sheet metal 2 are frozen during some automobile design and development. The method can quickly optimize the shape of the luggage rack 3 to meet the process requirements, such as Figure 1 As shown, it includes the following steps:

[0084] S1. Complete the main section design of the luggage rack on the structural model consisting of the roof sheet metal 1, the side panel sheet metal 2 and the luggage rack 3 and keep the distance between the luggage rack 3 and the roof sheet metal 1 and the distance between the luggage rack 3 and the side panel sheet metal 2 equal;

[0085] In this embodiment, if Figure 2 and Figure 3 As shown, the main cross-section design of the luggage rack 3 is completed at the highest position on the luggage rack 3, and the distance D1 between the luggage rack 3 and the roof sheet metal 1 and the distance D2 between the luggage rack 3 and the side panel sheet metal 2 are kept equal. The value range of the distance is 2mm to 3mm, preferably 2.5mm.

[0086] S2, extracting the isoparametric curve of the top surface of the luggage rack 3;

[0087] In this embodiment, if Figure 2 and Figure 4 As shown, curve Q represents an isoparametric curve. After this step, the first end point of the isoparametric curve needs to be extended along the curvature direction by a preset distance to pave the way for the next step. The preset distance ranges from 100 mm to 200 mm, preferably 150 mm.

[0088] S3, establishing an extension surface of the isoparametric curve in the height direction of the vehicle;

[0089] In this embodiment, specifically, Figure 5 As shown, the curved surface S represents an extended curved surface. The construction process of the extended curved surface is: stretching the isoparametric curve along the height direction of the car by a fourth preset length to obtain the extended curved surface. Specifically, the fourth preset length ranges from 200 mm to 300 mm, preferably 200 mm.

[0090] S4, drawing a vertical line perpendicular to the extended surface and having a first preset length through the first end point of the isoparametric curve;

[0091] In this embodiment, if Figure 6 As shown, point O represents the first endpoint; line segment OU represents the vertical line, and its length is the value of the first preset length. The first preset length determines the left and right swing length of the end of the luggage rack 3, and the value range is -10mm to 10mm, preferably -5mm, and the direction of the first endpoint close to the side panel 2 is the positive direction, and the direction of the first endpoint close to the roof panel 1 is the negative direction.

[0092] S5, taking the first endpoint as the starting point, intercepting a line segment of a second preset length along the isoparametric curve to obtain an intercepted curve;

[0093] S6, extending an end point on the intercepted curve on the same side as the first end point by a third preset length in the curvature direction to obtain an extended end point, and establishing a first sample curve that is tangent to the intercepted curve with the extended end point and an end of the perpendicular line away from the first end point as two end points;

[0094] In this embodiment, the second preset length and the third preset length cooperate to jointly determine the tensile curvature of the first sample curve. Figure 7 As shown, point E represents an endpoint on the same side as the first endpoint on the intercepted curve, and the length of line segment EF represents the value of the third preset length; the intercepted curve is the missing portion of the isoparametric curve between point O and point F, and its length is determined by the second preset length. The value range of the second preset length is 600mm to 1000mm, preferably 700mm. The value range of the third preset length is 200mm to 400mm, preferably 200mm. Figure 8 As shown, curve M represents the first sample curve.

[0095] S7, performing the same steps S2 to S6 as for the first endpoint on the isoparametric curve to obtain a second sample curve;

[0096] S8. Integrate the extended curve, the first sample curve and the second sample curve to obtain the final sample curve, and use the final sample curve to sweep the main section of the luggage rack 3, by adjusting the values ​​of the first preset length, the second preset length and the third preset length until the new luggage rack 3 satisfies the equal distance between the luggage rack 3 and the roof sheet metal 1 and the distance between the luggage rack 3 and the side panel sheet metal 2.

[0097] In this embodiment, if Figure 8 As shown, curve M and curve Q are connected to form a new curve, and the same is true for the other end of the isoparametric curve, thereby obtaining a final sample curve. The final sample curve is used to sweep the luggage rack 3, and the boundary that needs to be sawed and milled is cut off to check whether the luggage rack 3 satisfies the spacing between the luggage rack 3 and the roof sheet metal 1 and the spacing between the luggage rack 3 and the side panel sheet metal 2. If not, the first preset length, the second preset length and the third preset length are adjusted.

[0098] Please refer to Fig. 9 , Embodiment 2 of the present invention is:

[0099] A CATIA-based automobile luggage rack design terminal 4, based on the above-mentioned embodiment 1, as shown in the figure, includes a memory 5, a processor 6 and a computer program stored in the memory 5 and executable on the processor 6. When the processor 6 executes the program, the above-mentioned CATIA-based automobile luggage rack 3 design method is implemented.

[0100] In summary, the present invention discloses a CATIA-based automobile luggage rack design method and terminal, which constructs isoparametric curves and extended surfaces derived from the top surface of the luggage rack on a structural model composed of a roof sheet metal, a side panel sheet metal and a luggage rack, and designs a first sample curve and a second sample curve at both ends of the extended curve by setting a vertical line, intercepting a line segment and other operations, and obtains a final sample curve and uses it to sweep the main section of the luggage rack, thereby realizing rapid optimization of the shape data of the luggage rack. Specifically, by adjusting the first preset length, the second preset length and the third preset length, the luggage rack can be easily made to meet the requirements of the equal-section process while maintaining a uniform gap with the side panel sheet metal and the roof panel metal, thereby accelerating the progress of the project.

[0101] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A CATIA-based automobile luggage rack design method, characterized in that: The steps include: S1. Complete the design of the main section of the luggage rack on the structural model consisting of the roof sheet metal, the side panel sheet metal and the luggage rack, and keep the distance between the luggage rack and the roof sheet metal and the distance between the luggage rack and the side panel sheet metal equal; S2, extracting isoparametric curves of the top surface of the luggage rack; S3, establishing an extension surface of the isoparametric curve in the height direction of the vehicle; S4, drawing a vertical line perpendicular to the extended curved surface and having a first preset length through the first end point of the isoparametric curve; S5, taking the first endpoint as a starting point, intercepting a line segment of a second preset length along the isoparametric curve to obtain an intercepted curve; S6, extending an end point on the intercepted curve on the same side as the first end point by a third preset length in the curvature direction to obtain an extended end point, and establishing a first sample curve that is tangent to the intercepted curve with the extended end point and an end of the perpendicular line away from the first end point as two end points; S7, performing the same steps S2 to S6 as for the first endpoint on the second endpoint of the isoparametric curve to obtain a second sample curve; S8. Integrate the extended curve, the first sample curve and the second sample curve to obtain a final sample curve, and use the final sample curve to sweep the main section of the luggage rack, by adjusting the values ​​of the first preset length, the second preset length and the third preset length until the new luggage rack satisfies the equal spacing between the luggage rack and the roof sheet metal and the spacing between the luggage rack and the side panel sheet metal.

2. The CATIA-based automobile luggage rack design method according to claim 1, characterized in that: The step S3 is specifically as follows: The isoparametric curve is stretched by a fourth preset length along the height direction of the vehicle to obtain the extended curved surface.

3. The CATIA-based automobile luggage rack design method according to claim 2, characterized in that: After step S2 and before step S3, the following steps are also included: The first endpoint of the isoparametric curve is extended by a preset distance along the curvature direction.

4. The CATIA-based automobile luggage rack design method according to claim 1, characterized in that: The value range of the first preset length is -10mm to 10mm; The direction in which the first end point is close to the side panel metal is the positive direction, and the direction in which the first end point is close to the roof panel metal is the negative direction.

5. The CATIA-based automobile luggage rack design method according to claim 1, characterized in that: The second preset length has a value range of 600 mm to 1000 mm.

6. The CATIA-based automobile luggage rack design method according to claim 1, characterized in that: The third preset length has a value range of 200 mm to 400 mm.

7. A car luggage rack design terminal based on CATIA, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the following steps are implemented: S1. Complete the design of the main section of the luggage rack on the structural model consisting of the roof sheet metal, the side panel sheet metal and the luggage rack, and keep the distance between the luggage rack and the roof sheet metal and the distance between the luggage rack and the side panel sheet metal equal; S2, extracting isoparametric curves of the top surface of the luggage rack; S3, establishing an extension surface of the isoparametric curve in the height direction of the vehicle; S4, drawing a vertical line perpendicular to the extended curved surface and having a first preset length through the first end point of the isoparametric curve; S5, taking the first endpoint as a starting point, intercepting a line segment of a second preset length along the isoparametric curve to obtain an intercepted curve; S6, extending an end point on the intercepted curve on the same side as the first end point by a third preset length in the curvature direction to obtain an extended end point, and establishing a first sample curve that is tangent to the intercepted curve with the extended end point and an end of the perpendicular line away from the first end point as two end points; S7, performing the same steps S2 to S6 as for the first endpoint on the second endpoint of the isoparametric curve to obtain a second sample curve; S8. Integrate the extended curve, the first sample curve and the second sample curve to obtain a final sample curve, and use the final sample curve to sweep the main section of the luggage rack, by adjusting the values ​​of the first preset length, the second preset length and the third preset length until the new luggage rack satisfies the equal spacing between the luggage rack and the roof sheet metal and the spacing between the luggage rack and the side panel sheet metal.

8. The CATIA-based automobile luggage rack design terminal according to claim 7, characterized in that: The step S3 is specifically as follows: Extending the isoparametric curve as a whole along the height direction of the vehicle by a fourth preset length to obtain a boundary curve; The plane enclosed by the boundary curve and the original isoparametric curve is used as the extended curved surface.

9. The CATIA-based automobile luggage rack design terminal according to claim 8, characterized in that: After step S2 and before step S3, the following steps are also included: The first endpoint of the isoparametric curve is extended by a preset distance along the curvature direction.

10. The CATIA-based automobile luggage rack design terminal according to claim 7, characterized in that: The value range of the first preset length is -10mm to 10mm; The direction in which the first end point is close to the side panel metal is the positive direction, and the direction in which the first end point is close to the roof panel metal is the negative direction.

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