Data exchange method and application between the h

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Data exchange methods and application skills between cad/cam software

with the rapid development of cad/cam (computer aided design/computer aided manufacturing) technology and its wide application in the engineering field. More and more cad/cam data needs to be exchanged among different users. At present, mainstream CAD and CAM software widely used in the manufacturing industry include AutoCAD, pro/engineer, Unigraphics NX, Solidworks, inventor, CATIA, Mastercam, CAXA, etc. Due to the differences of application software among users, it is necessary to exchange their data between different cad/cam software systems. Due to the different languages used for cad/cam software development and the different software data recording and processing methods, it is an important problem for enterprises to realize the complete conversion and sharing of cad/cam data

1 cad/cam data exchange format

aiming at the effective conversion of data between different systems and the realization of data sharing, foreign countries have done a lot of research work on data exchange potential and important exchange standards and produced many standards, such as DXF, IGES, esp, PDEs in the United States, vdais and vdafs in Germany, set in France, step in ISO, etc. The establishment of these data conversion standards has played a great role in promoting the popularization and application of cad/cam technology

common data exchange formats include IGES, CGM, step, STL, Parasolid, etc. IGES is the earliest image data exchange format and one of the most widely used data exchange formats at present. It can convert 2D and 3D image files such as surfaces and curves. The file extension is Igs. CGM is a two-dimensional image file in ANSI standard format, which can be recognized by many drawing software. CCM can be easily migrated in unused operating systems. Because it is a two-dimensional image file and cannot be applied to a three-dimensional image file, its application range is also limited. Step is a relatively new data exchange format, which is formulated by ISO. It can well support entity data conversion and is the current data conversion standard. File extension STP. UGNX4.0 provides two step formats: step203 and step214. Step203 does not convert layer, color and other information. Step214 convert layer, color and other information. STL is the file format of small flat model, which is used for rapid prototyping. The measured points of the model can be directly converted to generate a facet model, and then UC can directly process the facet model. Ugnx6 provides modification and function for facet model. Parasolid is a format standard of UG software modeling system and the kernel of UG nx6 entity modeling. Parasolid modeling system supports solid modeling, cell modeling and free-form modeling. Many software uses this system, including Mastercam, pro/e, etc. the extension of this format file is x_ t。

2 selection method of data conversion format

due to the lack of a unified data exchange format between cad/cam software, data files often fail to open after conversion. Therefore, during data format conversion, try to select common data exchange formats among software, such as IGES, step, etc. During file data format conversion. Some copying methods should be followed, such as applying step format to convert solids and surfaces. Basically, there will be no surface dropping and incomplete image information; For file data conversion of points and various curves, ices format shall be used as much as possible; When converting entity file formats between Mastercam, UG, pro/e and other software with Parasolid as the core, it is best to use Parasolid format; Files in IGES format are often broken when they are directly transferred to UG. When you still cannot stitch a surface after a stitch operation, you can try a large stitch tolerance. If the large stitching tolerance can not stitch the surface, the source software of the file data should be considered. For example, if the source file comes from the pro/e system, the file can be imported into the pro/e system, and the entity can generally be automatically generated. Otherwise, the software will be used to repair it automatically. After the entity is generated, the file will be converted in step format

3 data format conversion between cad/cam softwares

there are many cad/cam softwares commonly used in engineering. Different softwares 3. The data exchange between systems taking the breaking load test of safety belt as an example is different. Here, the specific operation method of data conversion between UG software system and other cad/cam software systems is illustrated by taking UG software system as an example

3.1 data format conversion between UG and pro/e (3D)

to realize data format conversion between UG and pro/e and complete data sharing, UG files must first be converted into IGES or step format most commonly used in cad/cam data exchange. Before data conversion, translators must be installed in UG, otherwise the data format cannot be converted. For example, to convert a UG format file into a format file that can be opened in the pro/e system, click the file command in the UG menu, click export in the pop-up menu, and then select the format to convert in the pop-up menu. In the pop-up menu, there are data formats such as Parasolid and IGES. If the UG file to be converted is an entity graphic and the pro/e system is also an entity, then select Parasolid; If the entity data is converted into slices, IGES data format is selected. During the conversion process. It can be converted according to the opened data entity model in the UG system or according to the data file. The operation steps can be converted according to the pop-up dialog box. Finally, open the pro/e software system, click the converted data file and select the corresponding format to open the converted graphics file

3.2 data conversion between UG and AutoCAD (2D)

autocad is a powerful general software for professional design, and 2D functions are widely used. To realize the successful data conversion between UG and AutoCAD (2D), it is to convert the UG drawing file data into the file data that can be opened in AutoCAD. However, 3D data information cannot be converted to 2D design software. The specific operation method is to generate the engineering drawing file from the 3D image file in UG. Then click file, click export in the pop-up menu, and then select the format to be converted in the pop-up menu. The data can be calibrated by the metrological verification personnel of any metrological department in the form of DXF or CGM. Enter the name of DXF or CGM file in the dialog box that appears, and click OK. The UG system will export the file in the new format. Then select the corresponding data format in AutoCAD software to open the converted output drawing data file. If part of the image information is lost after the drawing file is opened, the UG drawing file cannot be directly saved as a DXF format file of AutoCAD, but converted through the intermediate format CGM, that is, first export the UG drawing file as a CGM format file, then import the CGM format file into a new file in UG, and then export the CGM format file as a DXF format file in UG, In this way, UG files can be seamlessly converted into DXF files in general

4 conclusion

in the field of computer aided design and manufacturing, cad/cam and other related software are widely used. It makes the cooperation between enterprises more close and the exchange of design data and processing data of industrial products more frequent. It is particularly important to realize data sharing among enterprises. Cad/cam data can be seamlessly converted from source file format to target data file by selecting a reasonable data conversion format, which is conducive to improving the working efficiency of engineers and technicians and the production efficiency of enterprises. (end)

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