tailieunhanh - 21st Century Manufacturing Episode 1 Part 7

Tham khảo tài liệu '21st century manufacturing episode 1 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 114 Product Design Computer Aided Design CAD and Solid Modeling Chap. 3 start-up company needing a modest CAD environment would also be wise to invest in these products which include but are not limited to AutoCAD commercially available from SolidWorks commercially available from IronCAD commercially available from Systems with High Overhead The next group of products have been built to do high-end solid modeling with realtime rendering and they maintain a parametric model of the emerging design. This means that objects are initially created generically without specific dimensions. When objects are specifically instantiated dimensions are added and everything scales up or down to suit. The user is able to define constraints between different parts of an object and then scale them. For long-term company growth over several product variants this has enormous appeal. However there is a major drawback. There is a huge learning time for such systems. Also since they are updated every 18 months or so further retraining on new revs is likely. These are powerful design tools for a large automobile company or a national laboratory. In these environments many similar components in a family are being designed. Their use in a bearing-manufacturing company like Timken Inc. is perhaps the easiest to visualize. Bore sizes races cover plates and the like can be created once and then scaled up or down. For future revisions of a component any existing parametric designs that might reside in a software library can quickly be reinstantiated to create a new object in the same family. These larger systems also have direct links to supplementary packages that will do DFM A and finite-element analysis. Most of them also include a CORBA-based open architecture that allows linking to other software applications . SDRC 1996 . ProEngineer commercially available from IDEAS commercially available from .