tailieunhanh - The Design of Manufacturing Systems Part 3

Tham khảo tài liệu 'the design of manufacturing systems part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | and so on. Guilford and Turner 1992 identified some of the deficiencies in the tolerancing models proposed by researchers prior to the year 1990. They reported that the committee on Shape Tolerance Resource Model within the Standard for the Exchange of Product Model Data STEP part 47 is attempting to define an unambiguous representation of tolerances compatible with the ANSI and the ISO 1101 family of standards. They identified a problem that exists in identifying locations and directions while defining tolerances and data. In STEP these are represented by Cartesian vectors but the problem of locating the part in the co-ordinate system exists. Guilford and Turner 1992 modified the approach employed by STEP in order to overcome the problems. For example STEP describes the direction along which the straightness tolerance is measured as a vector in the global co-ordinate system while the authors described it by using some virtual geometry entities attached to the actual geometry of the part. The authors have discussed the representation which covers almost all of the ANSI tolerances except for items such as knurls gears and screws equalizing data free state variations conical position tolerance zones and position tolerances on elongated holes. Feature Data Exchange Mechanisms Standards for Exchange of Product Data STEP is an international standard designated as ISO 10303 that deals with the computer interpretable representation and exchange of product model data. The intent is to provide a neutral interface which is capable of describing all the life-cycle properties of a given artifact independent of the CAD platform used for product modeling. This will also serve as a basis for implementing and sharing product databases and archives. The various parts of ISO 10303 are divided into the following categories description methods application protocols abstract test suites implementation methods and conformance testing. Application protocols AP provide a basis

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