TAILIEUCHUNG - Mechanical Tolerance Stackup and Analysis Part 4

Tham khảo tài liệu 'mechanical tolerance stackup and analysis part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 78 Chapter 7 be understood that where parts are assembled at one temperature and operate at a different temperature it is important to study both conditions as the parts must be assembled before they can operate. Tolerance Stackups are most accurate when done on parts and assemblies at the temperature at which they were inspected as that is likely the only verifiable geometric data obtained for the part geometry. Many more assumptions are required for Tolerance Stackups done at reduced or elevated temperatures as it is likely that the changes in part geometry due to thermal expansion are predicted . by FEA and not empirical. WORST-CASE TOLERANCE STACKUP EXAMPLES The Tolerance Stackup examples that follow increase in complexity from finding a minimum and maximum distance on a very basic part to finding a minimum and maximum distance on a complex bolted assembly with assembly shift. All of the examples are based on parts dimensioned and toleranced using the plus minus system. Although is fallible and not the best way to dimension and tolerance parts these early examples are intended to be simple and versatile in their application. By starting with the material is applicable to a broader swath of industry including those companies that have not yet adopted GD T as part of their standard engineering practice. These same examples are included in chapter 8 on statistical Tolerance Stackups so the reader can compare the results. The reporting methods of the following examples also increase in complexity from very simple to more complete. Ultimately the reader will be taught to use a formal Tolerance Stackup report form such as the one available from Advanced Dimensional Management . These problems however are based on simpler reporting formats as it is important at this early stage to keep the topic of Tolerance Analysis as uncluttered as possible. More formal and complete reporting tools and practices are covered in depth in later chapters. The first example shows how

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