First, the status quo of CAD technology applications
All designs have to draw, because engineers can't remember all the details of their design (even if it's simpler), and the text is not complete, so avatar is the only way. These diagrams are first for the designer to look at, in order to remember and study the design concept: secondly, to other engineers, in order to discuss each other: the last is to show the manufacturer, in order to turn the design intent into a real thing. In the whole process of design. The original idea is a three-dimensional (3D) entity, which is also without a doubt. However, in the traditional design, the information transfer between the two relies entirely on two-dimensional (2D) graphics. The 2D graphics digitization software represented by AutoCAD plays an important role in the popularization and application of CAD technology in China, and lays a very necessary technical foundation for the development of CAD technology today.
However, 2D mechanical CAD technology can not solve some problems in traditional design, and has a limited effect on improving design quality. What are the problems that affect design quality and efficiency? The author believes that there are the following points:
1, complex projection line generation
For drawing part drawings of casting and forging blanks, the intersection lines and intersecting lines of the contours are not understood, and designers often have a headache when drawing 2D drawings.
2, the size of the missing standard, the drawing line
Even after several people's review, the size of the missing mark and the lack of lines still occur from time to time.
3. Stress and strain analysis
It is easy to modify the dimensions of a part (such as a connecting rod). The problem is how to change it. If you want to modify it, you must perform mechanical analysis. Otherwise, what should I do if the link is broken? The design of foreign products is small and light, and our similar products are designed to be stupid and heavy, and the rigidity is not good.
4, CNC processing
It is often the case that plastic products are molded in accordance with foreign products and can be seen at a glance. why? Our injection mold did not give enough local contraction nose. On these complex three-dimensional problems, relying on traditional 2D design methods can not be solved.
5. Design updates and modifications
Design engineering management in CAD applications is also becoming increasingly important, and some CAD applications have accumulated thousands of drawings and are continuing to grow. In addition to the graphical information, these files have a large number of non-graphical information such as design parameters, not only to manage graphical information, but also to require tool software to handle these complex design parameter management issues.
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