A modeling method for the beam sheet metal bracket based on CATIA software

Abstract

The present invention relates to a modeling method for a crossbeam sheet metal bracket based on CATIA software. Taking the center point of the mounting hole on the crossbeam sheet metal bracket as the reference point and the plane parallel to and passing through the reference point as the reference plane, full parametric modeling is started. The untrimmed boundary surface patches and the mounting hole trimming patches are constructed in sequence, and then trimming and stitching are carried out. Then chamfering is performed and the mounting holes are made. Finally, the patches are thickened to form the digital model of the crossbeam sheet metal bracket. In the later stage, in addition to facilitating the modification of the original full parametric modeling method, the automatic update of the crossbeam sheet metal bracket structure can be directly achieved by modifying the coordinate values of the mounting points, so as to quickly achieve the matching with the surrounding parts. Moreover, all subsequent adjustments are directly or indirectly related to the mounting holes on the crossbeam sheet metal bracket, which can not only improve the efficiency of modeling and later modification, but also solve the technical problem of effectively avoiding update errors, and can significantly improve the design efficiency of the product. This modeling method is simple and easy to understand.

Description

Technical Field

[0001] The invention relates to the field of automobile parts design, and in particular to a crossbeam sheet metal bracket modeling method based on CATIA software. Background Art

[0002] As an important component of the car dashboard, the crossbeam sheet metal bracket is generally installed on the round tube of the dashboard crossbeam by welding; the crossbeam sheet metal bracket can not only ensure the strength of the body structure, but also provide installation points for other parts around the dashboard. During the layout stage of the dashboard, the crossbeam sheet metal bracket needs to be adaptively modified multiple times because the dashboard installation structure needs to be strengthened or because the layout plan of the parts around the dashboard needs to be changed. Generally, it needs to be modified 5 to 10 times.

[0003] In the prior art, in order to solve the problem that the crossbeam sheet metal bracket needs to be modified multiple times, the conventional modeling method is to use the original coordinate origin as the reference point, make the surface first and then make the hole. The specific steps are: divide the crossbeam sheet metal bracket into multiple independent structures, chamfer each independent structure in sequence, punch and cut the surface of the independent structure that has been chamfered in the last step, and then thicken the cut surface to complete the modeling.

[0004] With this modeling method, each time the beam sheet metal bracket is modified, especially when the position of the mounting holes thereon is adjusted, because there is no association between the reference plane selected during modeling and the hole opening command, other features and hole positions of the beam sheet metal bracket need to be moved separately during later modifications. Especially when there are multiple modeling steps after the solid structure is generated, during the update operation, it is easy for changes in information such as the hole opening surface and chamfer under the solid structure to not be updated synchronously, and even cause update errors. Then, the design needs to be re-adjusted, multiple uncut surfaces need to be re-moved, and the surfaces, holes, chamfers and other features that cooperate with other parts need to be modified to achieve the overall data update of the beam sheet metal bracket. This takes a long time to modify and can easily lead to update errors, making the modification extremely inconvenient. Summary of the invention

[0005] The purpose of the present invention is to provide a modeling method for a beam sheet metal bracket based on CATIA software. Taking the center point of the mounting hole on the beam sheet metal bracket as the reference, parametric construction begins, and all subsequent adjustments are directly or indirectly related to the mounting holes on the beam sheet metal bracket. This can not only improve the efficiency of modeling and subsequent modification, but also solve the technical problem of effectively avoiding update errors.

[0006] To achieve the above purpose, the present invention designs a beam sheet metal bracket modeling method based on CATIA software, comprising the following steps:

[0007] Step 1. Take the center of the mounting hole on the crossbeam sheet metal bracket as the reference point Point1; use the Coordinates menu of the Point command to construct the center point of the mounting hole as the reference point by directly entering the coordinate values.

[0008] Step 2. Take the plane parallel to the plane passing through the reference point as the reference plane plane1; use the Parallel through point menu of the Plane command to establish the reference plane plane1 parallel to the reference point Point1 by selecting a plane in the original coordinate plane and the reference point Point1.

[0009] Step 3. Construct two other planes plane2 and plane3 that are perpendicular to the reference plane plane1, and the three planes plane1, plane2, and plane3 are perpendicular to each other in pairs.

[0010] Step 4. Construct the plane where the untrimmed patch is located.

[0011] According to the three basic planes plane1, plane2, and plane3 in Step 3, create three boundaries of the bracket; plane3 is translated by Offset from plane to obtain the left and right boundary planes of the bracket; plane2 is translated by Offset from plane to obtain the upper and lower boundary planes of the bracket, and plane3 is translated by Offset from plane to obtain the trimming feature boundary plane.

[0012] According to the reference point Point1, create the center point of the second mounting hole on the crossbeam sheet metal bracket plane through the Point Definition command as the reference point Point2, and use the Parallel through point of the Plane command to create a plane passing through the reference point Point2 and parallel to the plane2 as the upper boundary at the crossbeam of the bracket.

[0013] Step 5. Construct the untrimmed patch.

[0014] Step 6. Construct the auxiliary trimming plane for the bracket chamfer.

[0015] Step 7. Trim the patch.

[0016] Step 8. Chamfer the patch.

[0017] Step 9. At the reference points point1 and point2, respectively make the wire harness mounting holes and the instrument panel body mounting holes that cooperate with the instrument panel crossbeam; and trim.

[0018] Step 10. Thicken the patch to form the digital model of the crossbeam sheet metal bracket.

[0019] As a preferred solution, if the installation surface of the instrument panel crossbeam is not parallel to plane1, add a transition surface plane0 parallel to the installation surface of the instrument panel crossbeam, create a reference line passing through the reference point Point1 and perpendicular to plane3, and rotate plane0 according to the angle of the installation surface of the instrument panel crossbeam to obtain plane11, and then construct two other planes plane12 and plane13 perpendicular to plane11.

[0020] As a preferred solution, in step 5, create a rectangular sketch Sketch1 based on plane1, and use the Fill command to select the rectangular sketch Sketch1 constructed in the previous step to generate an untrimmed patch surf1 that fits the instrument panel body; create a rectangular sketch based on the upper and lower boundary planes of the bracket, and use the Fill command to select the rectangular sketch constructed in the previous step to generate untrimmed patches surf2 and surf5 that fit the instrument panel body; create a rectangular sketch based on the trimming feature boundary plane, and use the Fill command to select the rectangular sketch constructed in the previous step to generate untrimmed patches surf3 and surf4 that fit the instrument panel body; where the untrimmed patches surf2 and surf5 are parallel but not coplanar, then bridge the two non-coplanar planes through Blend Definition and combine them into a complete surface through Join Definition.

[0021] As a preferred solution, in step 6, create a sketch Sketch2 based on plane2, and use the ExtrudedSurface Definition to stretch the sketch into a surface to generate auxiliary cutting surfaces surf6 and surf7.

[0022] As a preferred solution, in step 7, trim the untrimmed patches surf1 to surf5 through the Trim command, and use the Split command to trim the edges in combination with each boundary surface and the auxiliary cutting surfaces surf6 and surf7 to obtain the bracket plane.

[0023] As a preferred solution, use commands such as Extrude, Offset, Sweep, Multi-Sections Surface or Blend to construct untrimmed patches, and fill the patches around the untrimmed patches through the Blend command to make the untrimmed patches parametrically associated with the reference point Point1.

[0024] The beneficial effects of the present invention:

[0025] Taking the center point of the mounting hole on the crossbeam sheet metal bracket as the reference point and the plane passing through the reference point in parallel as the reference plane, start full-parametric modeling. Sequentially construct the untrimmed patches, and then perform trimming, stitching, chamfering, and making the mounting holes. Then thicken the patches to form the digital model of the crossbeam sheet metal bracket. In addition to facilitating modification using the original full-parametric modeling method in the later stage, the automatic update of the crossbeam sheet metal bracket structure can also be directly achieved by modifying the coordinate values of the mounting points, thus quickly realizing the matching with the surrounding components. Moreover, all subsequent adjustments are directly or indirectly related to the mounting holes on the crossbeam sheet metal bracket. This can not only improve the efficiency of modeling and later modification but also solve the technical problem of effectively avoiding update errors, significantly enhancing the design efficiency of the product. This modeling method is simple and easy to understand. Description of the Drawings

[0026] Figure 1 Schematic diagram of the mounting structure of the crossbeam sheet metal bracket on the instrument panel;

[0027] Figure 2 is Figure 1 partial enlarged schematic diagram of;

[0028] Figure 3 Schematic diagram of the reference modeling features of the present invention;

[0029] Figure 4 Schematic diagram of the modeling features of the boundary patch of the crossbeam sheet metal bracket of the present invention;

[0030] Figure 5 Schematic diagram for constructing the chamfering auxiliary cutting plane of the crossbeam sheet metal bracket;

[0031] Figure 6 Schematic diagram of the untrimmed patch of the present invention;

[0032] Figure 7 Schematic diagram of the trimmed patch and stitching of the present invention;

[0033] Figure 8 Schematic diagram of the chamfering of the present invention;

[0034] Figure 9 Schematic diagram of making the mounting hole of the present invention;

[0035] Figure 10 Schematic diagram of the thickening result of the present invention;

[0036] Figure 11 Feature example of the matching part between the wire harness mounting hole and the instrument panel crossbeam of the present invention.

[0037] Description of the reference numerals:

[0038] Crossbeam sheet metal bracket 1, instrument panel body 2, instrument panel crossbeam 3, instrument panel body mounting hole 4, wire harness mounting hole 5, center point of instrument panel body mounting hole 6, center point of wire harness mounting hole 7, trimming feature boundary plane 8, left and right boundary planes of the bracket 9, upper and lower boundary planes of the bracket 10. Detailed implementation mode

[0039] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the present invention will be further described below in conjunction with the drawings and through specific implementation modes. It can be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings rather than all of them.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention relates to a method for modeling a crossbeam sheet metal bracket based on CATIA software. Taking the center point of the mounting hole and the mating surface with the crossbeam as the reference, features such as surfaces, lines, and sketches used for generating the untrimmed patches are constructed, and the features for trimming the untrimmed surfaces are carried out for full parametric modeling. In the later stage, in addition to realizing the convenient modification of the original full parametric modeling method, the structure of the crossbeam bracket can be automatically updated by directly modifying the coordinates of the mounting points.

[0043] In this embodiment, the upper end of the crossbeam sheet metal bracket 1 is mounted on the instrument panel crossbeam 3 through the wire harness mounting hole 5, and the lower end is mounted on the instrument panel body 2 through the instrument panel body mounting hole 4, as Figure 1 、 Figure 2 shown.

[0044] The reference modeling features of the present invention are as follows Figure 3 as shown, and after the modeling is completed, the schematic diagram of the features can be seen in Figure 10 . The specific steps of this modeling method are as follows:

[0045] Step 1. Take the center of the mounting hole on the crossbeam sheet metal bracket as the reference point Point1; use the Coordinates menu of the Point command to construct the center point of the mounting hole as the reference point by directly inputting the coordinate values;

[0046] In this embodiment, the center point 6 of the instrument panel body mounting hole is selected as the reference point Point1.

[0047] Step 2. Take the plane parallel to the plane passing through the reference point as the reference plane plane1; use the Parallel through point menu of the Plane command to establish the reference plane plane1 parallel to the reference point Point1 by selecting one of the original coordinate planes and the reference point Point1;

[0048] In this embodiment, the selected original coordinate plane is the yz plane, then plane1 is a plane parallel to the yz plane, denoted as plane1 / / yz plane.

[0049] Step 3. Construct two other planes plane2 and plane3 perpendicular to the reference plane plane1, and the three planes plane1, plane2, and plane3 are perpendicular to each other in pairs;

[0050] In this embodiment, plane2 is a plane parallel to the xy plane, and plane3 is a plane parallel to the xz plane, denoted as plane2 / / xy plane, plane3 / / xz plane.

[0051] If the installation surface of the instrument panel body is not parallel to the yz plane, then add a transition plane plane0, define plane0 / / yz plane, create a reference line passing through the center point 6 of the wire harness mounting hole and perpendicular to the xz plane, and rotate plane0 according to the angle of the instrument panel crossbeam mounting surface to obtain plane11, and then construct two other planes plane12 and plane13 perpendicular to plane11. The above is the way to adjust the angle of the basic plane, which is applicable to the installation surface with a certain angle to the coordinate axis. For the sake of simple expression of the modeling idea, the subsequent steps of the installation surface are described according to plane1 / / yz plane.

[0052] Step 4. Construct the plane where the uncropped patch is located: Based on the three basic planes plane1, plane2, and plane3 in Step 3, create the three boundaries of the bracket. Plane 3 is translated by Offset from plane to obtain the left and right boundary planes 9 of the bracket; plane 2 is translated by Offset from plane to obtain the upper and lower boundary planes 10 of the bracket, and plane 3 is translated by Offset from plane to obtain the cropping feature boundary plane 8;

[0053] Taking the center point 6 of the dashboard body mounting hole as the reference point, create the second mounting hole center point of the bracket plane, that is, the center point 7 of the wire harness mounting hole as the reference point Point2 by the command Point Definition. Use the Parallel through point of the Plane command to create plane 4 that passes through the center point 7 of the wire harness mounting hole and is parallel to plane 2 as the upper boundary at the crossbeam of the bracket;

[0054] Step 5. Construct the uncropped patch:

[0055] Based on the planes created in Step 4, create a rectangular sketch Sketch1 with plane1 as the basis. Use the Fill command to select the rectangular sketch Sketch1 constructed in the previous step to generate the uncropped patch surf1 that fits the dashboard body; create surf2 - surf5 in the same way; create a rectangular sketch with the upper and lower boundary planes of the bracket as the basis, and use the Fill command to select the rectangular sketch constructed in the previous step to generate the uncropped patches surf2 and surf5 that fit the dashboard body; create a rectangular sketch with the cropping feature boundary plane as the basis, and use the Fill command to select the rectangular sketch constructed in the previous step to generate the uncropped patches surf3 and surf4 that fit the dashboard body;

[0056] Among them, the uncropped patches surf2 and surf5 are parallel but not coplanar. Then, bridge the two non - coplanar planes through Blend Definition and combine the 3 planes into a complete surface through Join Definition;

[0057] Step 6. Construct the auxiliary cutting plane for the bracket chamfer;

[0058] Create a sketch Sketch2 with plane2 as the basis, and use the Extruded Surface Definition to stretch the sketch into a surface to generate the auxiliary cutting surfaces surf6 and surf7;

[0059] Step 7. Cut the surface patches; cut surf1-5 using the Trim command, and combine each boundary surface and surf6, surf7 to trim the edges using the Split command. Obtain the bracket plane.

[0060] Step 8. Chamfer the surface patches;

[0061] Step 9. At the reference points point1 and point2, respectively, make a wire harness installation hole and an instrument panel body installation hole that cooperate with the instrument panel crossbeam; and cut;

[0062] Step 10. Thicken the surface patches to form the digital model of the crossbeam sheet metal bracket.

[0063] This method is more suitable for parts that need to be adjusted multiple times subsequently. For other parts with fewer modification times, there is no obvious difference in the modeling and modification efficiency between the modeling method of the present invention and the modeling method of the prior art.

[0064] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A modeling method for the crossbeam sheet metal bracket based on CATIA software, characterized in that: It includes the following steps: Step 1. Take the center of the mounting hole on the crossbeam sheet metal bracket as the reference point Point1; use the Coordinates menu of the Point command to construct the center point of the mounting hole as the reference point by directly inputting the coordinate values. Step 2. Take the plane parallel to the plane passing through the reference point as the reference plane plane1; use the Parallel through point menu of the Plane command to establish the reference plane plane1 parallel to the reference point Point1 by selecting one of the original coordinate planes and the reference point Point1. Step 3. Construct two other planes plane2 and plane3 perpendicular to the reference plane plane1, and the three planes plane1, plane2, and plane3 are perpendicular to each other in pairs. Step 4. Construct the plane where the untrimmed patch is located. According to the three basic planes plane1, plane2, and plane3 in Step 3, create three boundaries of the bracket; the plane3 is translated by Offset from plane to obtain the left and right boundary planes of the bracket; the plane2 is translated by Offset from plane to obtain the upper and lower boundary planes of the bracket, and the plane3 is translated by Offset from plane to obtain the trimming feature boundary plane. According to the reference point Point1, create the center point of the second mounting hole on the crossbeam sheet metal bracket plane through the Point Definition command as the reference point Point2, and use the Parallel through point of the Plane command to create a plane passing through the reference point Point2 and parallel to the plane2 as the upper boundary at the crossbeam of the bracket. Step 5. Construct the untrimmed patch. Step 6. Construct the chamfering auxiliary cutting plane of the bracket. Step 7. Trim the patch. Step 8. Chamfer the patch. Step 9. Make wire harness mounting holes and instrument panel body mounting holes that match the instrument panel crossbeam at the reference points point1 and point2 respectively; and trim them. Step 10. Thicken the patch to form the digital model of the crossbeam sheet metal bracket.

2. The modeling method of the crossbeam sheet metal bracket based on CATIA software according to claim 1, characterized in that: If the instrument panel crossbeam mounting surface is not parallel to the plane1, add a transition plane plane0 parallel to the instrument panel crossbeam mounting surface, create a reference line passing through the reference point Point1 and perpendicular to the plane3, and rotate the plane0 according to the angle of the instrument panel crossbeam mounting surface to obtain the plane11, and then construct two other planes plane12 and plane13 perpendicular to the plane11.

3. The modeling method of the crossbeam sheet metal bracket based on CATIA software according to claim 1, characterized in that: In step 5, a rectangular sketch Sketch1 is created based on plane1. The Fill command is used to select the rectangular sketch Sketch1 constructed in the previous step to generate an untrimmed patch surf1 that fits the dashboard body. A rectangular sketch is created based on the upper and lower boundary planes of the bracket, and the Fill command is used to select the rectangular sketch constructed in the previous step to generate untrimmed patches surf2 and surf5 that fit the dashboard body. A rectangular sketch is created based on the trimmed feature boundary plane, and the Fill command is used to select the rectangular sketch constructed in the previous step to generate untrimmed patches surf3 and surf4 that fit the dashboard body. Among them, the untrimmed patches surf2 and surf5 are parallel but not coplanar. Then, the two non-coplanar planes are bridged through Blend Definition and combined into a complete surface through Join Definition.

4. The modeling method of the crossbeam sheet metal bracket based on CATIA software according to claim 3, characterized in that: In step 6, a sketch Sketch2 is created based on plane2, and the sketch is stretched into a surface using Extruded Surface Definition to generate auxiliary cutting surfaces surf6 and surf7.

5. The modeling method of the crossbeam sheet metal bracket based on CATIA software according to claim 4, characterized in that: In step 7, the untrimmed patches surf1 to surf5 are trimmed using the Trim command, and the Split command is used in combination with each boundary surface and the auxiliary cutting surfaces surf6 and surf7 for edge trimming to obtain the bracket plane.

6. The modeling method of the crossbeam sheet metal bracket based on CATIA software according to any one of claims 1 to 5, characterized in that: Use the Extrude, Offset, Sweep, Multi-Sections Surface, or Blend command to construct the untrimmed patch, and fill the patches around the untrimmed patch using the Blend command to make the untrimmed patch parametrically associated with the reference point Point1.

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