Second, on the drawing of 2D graphics
The problem of "D" of "CAD" has not been recognized for a long time. There are three reasons for this: First, CAD software is a relatively naive system for many years, and its ability is weak. In fact, the version before AutoCAD R9 is only suitable for drawing 2D graphics. Second, related software developers often lack engineering design experience, and can not deeply understand the actual design process and specific processing methods: Third, mechanical design is more troublesome and less standardized in various designs, and among them, it is easier to do. It is to draw 2D drawings. In the actual design, the 2D drawing work includes copying, but it is important to create a graphical representation of the new structure. For example, when designing a lathe spindle, when starting to conceive, it is said that there should be several steps, each length. The rough data that was started to be developed is likely to be modified beyond recognition in the later design process. It is only at the end of the design that the parameters of the spindle are really clear, so in fact, the specific parameters of the part are not at the beginning of the design. definite. The general design process always involves four parts of the drawing work, such as sketches, assembly sketches, disassembled parts drawings, and formal assembly drawings. So the way to draw 2D graphics is to aid drawing rather than assisting design.
Therefore, engineers are looking forward to the use of CAD technology in auxiliary design. In fact, AutoCAD's geometric design in 2D graphics processing is extremely powerful and the accuracy is very reliable. After mastering the operation skills or assisting with the less complicated AutoLISP program, it can solve many engineering data solving problems that are difficult to solve by mathematical analytical methods. Therefore, the author believes that "Design Design" is the real benefit of applying CAD, which can effectively improve the design quality.
Third, starting from three-dimensional design is an inevitable trend
The 3D entities that people see in real life are entities with concepts such as color, material, hardness, shape, size, position, and even 3D entities with fairly complex motion relationships. Due to the limited means of expression in the past, in mechanical drawing, people have to agree on the rules of parallel orthographic projection with the first quadrant, and express their own 3D design with several associated 2D projections. This kind of information expression is incomplete, and the drawing and reading pictures are specially trained. If you can design directly from the 3D concept, such a 3D model can express all the geometric parameters required for the design concept. Only when designing from 3D, the auxiliary function of CAD software to design can be easily extended and penetrated into the whole process of product development.
The design starting from 3D still needs the expression of 2D engineering drawings, and it must comply with the specifications of traditional design. Therefore, as the CAD basic software, it is necessary to generate 2D drawings from 3D white motion. And has the ability to two-way association. Based on this, further stress and strain analysis, part quality attribute analysis, space motion analysis, assembly and thousands of analysis, digital control processability analysis, accurate 2D engineering drawing generation, appearance color and modeling effect evaluation, assembly product explosion diagram A series of requirements, such as product design data management, should be fully satisfied. This is the effective assistance of CAD technology to the whole process of design, and it is CAD with clear technical and economic benefits. Therefore, the traditional 2D project The data management of graph-based graphic design will become the preservation and management of 3D design data, so that the mechanical drawing lesson of higher vocational colleges can be greatly reduced, and the original 3D concept of students will be retained as much as possible. The drawing method of the 2DC chart should also be greatly simplified.
INVENTOR, the product of Autodesk, USA, is one of the currently very useful software. It is based on AutoCAD2002, with all the 2D graphics processing capabilities of AutoCAD, and adds a lot of support for mechanical design. For 3D modeling, it is based on features, parameterization based on size constraints and constraints, and has better 3D and 2D bidirectional association capabilities. For 3D surfaces, there are good modeling and finishing functions. Another major feature of INVENTOR is the ability to integrate other companies' application software into a specific user environment, providing a convenient secondary development interface, which is an effective inheritance and development of the traditional AutoCAD open architecture.
For complicated projection line generation, the size of the missing mark, and the problem of missing the drawing line, it is very easy to solve in INVENTOR. In INVENTOR, the 2D drawing is not directly generated, but the sketch is first drawn, and only some dimensions are drawn. It is necessary to make some modifications and supplements.
The correct and reliable 2D projection line means that the complicated projection and the missing drawing line of the wrong drawing will not happen. For the standard size problem, it is automatically solved in the INVENTOR. If the size of the 3D modeling is not constrained. Grid, INVENTOR will prompt you for missing a few dimensions or geometric constraints, so there will be very few missing dimensions.
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