CAD/CAM technology promotes technological advancement in enterprises (2)

2. Application of 3D technology for new product design At the beginning of 1998, our factory selected vacuum contactor as the “model design” for product development using UG. When designing a solution, first of all, it is a functional design that meets the requirements of the technical specifications. Utilize UG's 3D modeling capabilities to design, determine the overall layout, make simple geometric shapes, and develop which features the product should have to perform its functions, as well as the relative position of each functional component. According to different usage requirements, we design several different solutions, and then comprehensively modify the opinions of users and parties until they are satisfied. Make the scheme model into a color tif image and perform a multimedia presentation on the computer for best results. Second, the overall structural design. Start specific engineering at this stage. According to the structure determined by the scheme, the outer structural size and the fitting size of each component, and the constraint relationship between the components are determined. Third, zero, the structural design of the components. The "top-down" and "bottom-up" designs are based on the correlation and modifiability between the components of the component parts. In the components, the mutual fit size and spatial position of each part, and various necessary data are finally determined. After the component design is completed, the components of different shapes are designed according to the structure of each component determined in the component. The designers used the various techniques of the 3D UG software to complete the part design. Fourth, design verification. Use UGInfoAnalysisinterference to check for interference between the assemblies, whether the mutual position is correct, and eliminate a large number of design errors before the plot. Using MSC/Nastran software to carry out finite element analysis and calculation of the structure, the UG/GFEMPlus module is used to do the finite element pre- and post-processing, and the dynamic characteristics and dynamic response of the structure under high-speed motion and strong force are obtained, which is the structure of the design part. The form and the selected material provide the basis for ensuring that the designed part is of a reasonable structure and the material is properly selected. According to the inspection, analysis, and calculation results, the design is repeatedly modified to optimize the design of the zero and parts to design a perfect product. Finally, we refine all the parts and make 2D engineering drawings.

3. The mechanism analysis of the product using the CAE function of UG uses the cationMechanism in UG to perform motion analysis of the moving parts. Check whether the constraint relationship between the moving parts is correct during the movement and whether there is interference during the movement. This is not possible with the use of the board design. This not only improves the quality of the design but also accurately predicts the performance of the product. For example, we applied UG to complete the analysis of the mechanism of the center cabinet. First, the advanced modeling function of UG is used to complete the three-dimensional modeling of the main components of the center console, including the grounding switch transmission locking device, the valve linkage device, and the assembly functions of the UG are assembled together. After the assembly is completed, the connection points and directions between the parts moving relative to each other are marked, and accordingly, the constituent elements of the shutter interlock mechanism are respectively defined by the mechanism analysis module of the UG. According to the composition principle of the mechanism, Mr. becomes the moving component of the valve interlocking mechanism. The UG is called the link. The three-dimensional part entity can be used as the connecting rod. According to the movement relationship of each component in the actual mechanism, between the connecting rods. Establish a sports joint. And two active motion pairs are defined according to the actual motion: the upper and lower shutters, and the limit value of the steering motion is specified, and finally a full-restraint (zero degree of freedom) shutter motion mechanism is formed.

Using the Artification function in UG/Mechanism to solve, simulate the motion of a given mechanism, find the trajectory of the shutter, and use the Trace function in the post-processing function to define the flap as the object of the track being tracked. Through the motion analysis and post-processing, the maximum limit value of the valve movement can be easily obtained, and the interference of each part during the movement can be checked. Using the UG/Mechanism function, we solved the problem of the movement law of the valve in a short time. The components of the UG that make up the mechanism are real three-dimensional part entities, so the entire organization is intuitive, visual, and accurate. In the post-processing function, various parameters of the required moving parts can be obtained by means of measurement, tracking trajectory and interference check. Therefore, to accurately describe the motion of the real space, it is necessary to form a moving component based on the three-dimensional entity, reasonably select the motion pair and the motion condition, and realize the correct constraint of the mechanism. When defining the motion pair, its motion, origin, direction, The restriction point plays an important role in the correctness of the establishment of the institution.

Fourth, the experience of CAD / CAM application process

The first step-by-step goal, the appropriate investment in stages, the correct and feasible implementation plan is very important. Everything has its own development law. The advanced manufacturing technology of CAD/CAM has also experienced a long development path. Similarly, there must be a process to implement this technology. Even in developed countries, the success rate is not 100%. Some of them are stagnating at a certain stage, and some are failing. The key may be that the target, investment, and implementation should be compatible. Actually and balanced, the goal should be concrete and easy to implement and lay the foundation for the next big goal. The investment should be just enough to prevent the product from being replaced or idle. The implementation plan should be specific, operability and combined with strong administrative measures to speed up implementation.

The decision and goal of the second leader is very important. The reason why the application of CAD/CAM in our factory can be quickly promoted is because the factory leaders directly put forward the implementation goals and formulate implementation measures. At the end of 1996, the factory leaders decided to introduce the open CAD to popularize the engineering and technical personnel to realize the slab project. When this goal was achieved, at the end of 1997, the symposium on CAD application was organized without any opportunity to further improve the design efficiency. Shorten the design cycle and reduce design errors. In particular, how to apply 3D software to physical simulation at a higher level to fully reduce the workload of prototype testing. Finally, after careful research, the UGII software was introduced from the US EDS company. A detailed implementation plan has been developed.

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