Some enterprises in the choice of CAD system using three-dimensional modeling system is always hope, that since the parts are three-dimensional, three-dimensional modeling is only natural that the two-dimensional graphics are out of date; or that generate three-dimensional shape, you can generate two-dimensional view, So no need to draw two-dimensional map of the. With a certain degree of universality of this view, is not three-dimensional modeling system to replace two-dimensional drawing on it?
Drawings reflect the engineering and technical personnel design language, also contains a number of the national standard contract and simplified by choosing the most reasonable projection plane, split position, split ways to express the geometric and processing information, a simple , complete, accurate, such a projection based on the principles to engineering drawings to express the complexity of the parts are almost limitless, nearly two hundred years of human use of the full characterization of components that the project plan is reasonable.
Three-dimensional modeling system must store the basic body parts from the assembly process and the object point, line, surface and volume of the structural relationship is the need to store huge amount of data, through a limited number of modeling methods can express the complexity of the parts is limited, and these three-dimensional modeling system requirements, generally for the graphics workstation hardware platforms, software, hardware, and training a great investment. General three-dimensional modeling system can still express the geometric information, but the expression of components of accuracy, roughness, and feature a variety of processing more difficult. In fact, with increasing complexity of parts, with three-dimensional modeling system to express the difficult parts of the two-dimensional graphics system than to increase faster; In addition, these three-dimensional modeling system based on the user's knowledge and operating skills are higher, and to master difficult. Jinan First Machine Tool Plant in the investigation of various workstation software modeling capability found that while a few three-dimensional modeling system lathe headstock shape, the results only Uclid software modeling more than a week after the success of several other errors occurred. It is reported that in western developed countries, most still use the two-dimensional graphics system design, such as Siemens, 80% of the parts diagram is drawn with a two-dimensional graphics system.
Some people say that parts are three-dimensional, but is two-dimensional drawings, with the expression of three-dimensional drawing a circle around the body, to understand complex engineering drawings, requires considerable imagination and experience of space, while the three-dimensional modeling system natural expression of components necessary to understand three-dimensional modeling system of the shaft side of the map drawn more intuitive. As everyone knows, there are some practical experience in the post, draw and read engineering drawings is relatively easy. In turn, the computer screen is two-dimensional, three-dimensional screen using two-dimensional modeling, but also around in a circle, hand-held model is not as intuitive as the need to frequently enter the three-dimensional coordinates and other information, conversion of space coordinates, need more high spatial imagination, especially the expression of a complex internal structure is more difficult, and only after completion of the final model show realistic effects. In the modeling process, the general shows the wireframe model without blanking the screen display more cluttered and difficult to operate. The existing two-dimensional graphics modeling system output does not meet national standards, it can not provide threads, gears, splines and other technology features indicative of two-dimensional drawing capabilities. The design of many conventional components, there is no need to use three-dimensional modeling.
All in all, three-dimensional modeling system in a very long time and can not replace the two-dimensional mapping system, the applications should be based on specific, to select software, in general, the manufacturing process, Xuanyongerwei drawing system to meet the requirements in design and some automobile shape occasion need to use complex surface expression of three dimensional modeling system, works in the rejection drawing board, the large number of needs is good, beneficial to universal, consistent with the principle of two-dimensional engineering drawing system, rather than the three-dimensional modeling system.
For these reasons, multi-level CAD software, long-term coexistence is inevitable. In fact, the opening goal and three dimensional modeling software, CAD software is compatible and complementary relationship. After conducting modeling three-dimensional modeling software, usually need to generate drawings, so you can head DXF CAD file conversion to open for editing, annotation, output, the output of drawings in line with national standards, but also for process planning.
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