3 3D parts library based on parametric model

3.1 The basic principle of creating a 3D parts library

According to the principle of similarity, the parts that need to be built are classified, and the composite parts that can fully represent all the parts of the part family or part series are determined. Composite parts are 3D part models created interactively in the UG NX environment, which we call 3D part templates. The composite part combines the shape and structural features of all the parts of the part family, that is, the composite part can derive any part of the part family, and the part can inherit all or part of the characteristics of the composite part. Based on the 3D part template, a set of design parameters is determined to control the shape and topological relationship of the model, and the series size of the part family design parameters is established. Finally, the creation of a three-dimensional parts library is achieved by automatically selecting a three-dimensional model of the part by selecting different series sizes.

3.2 Generate 3D part template

Using UG NX's Part families tool, you can easily define the main parameters of the part to generate a serialized parts database. Enter Part families, extract the nine main drive parameters of R, Z, B, d, R1, a, F, v, t in the expression, set the save directory, select the Create command to enter the Excel worksheet. In Excel, the value of the part control parameter is entered according to the standard part size or the standard size of the standard part, as shown in Figure 6. After saving the family and exiting the Part families, the 3D part template with the Excel parameter table is generated.

Figure 6 Entering data in Part families

3.3 Call of 3D parts library

In the new model file or assembly file, click the Import Model command to select the finished milling cutter model file. All the specifications that we entered in the Excel worksheet will appear in the matching member list (as shown in Figure 7). , select the required specifications, the system will automatically survive the new part model and assemble with the tool holder (as shown in Figure 8).

Figure 7 introduces the sample library

4 Conclusion

The CNC tool design platform developed by the powerful related parametric modeling function provided by UG NX can be easily edited and modified to speed up the design process. Based on the relevant parametric model, the Excel worksheet of the part family can quickly and accurately create a 3D model library of standard parts, general parts and tool series design. Significantly improve design efficiency, free designers from heavy repetitive work, and focus more on creative design work.

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