tailieunhanh - Designing Capable and Reliable Products Episode 4

Tham khảo tài liệu 'designing capable and reliable products episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Objectives application and guidance for an analysis 75 important. For example tolerances on a dimension a surface roughness requirement or some intricate geometry on a component. These important characteristics need to be controlled and understood. The quality inherent in manufacturing a component is essentially dictated by the designer and can be accounted for by the level of knowledge in the following design manufacture interface issues - Process precision and tolerance capability tp. - Material to process compatibility mp. - Component geometry to process limitations gp. - Surface roughness and detail capability 5p. - Surface engineering process suitability kp. From consideration of these issues risk indices can be formulated using charts to reflect the limits of variability set by the design which can be achieved by the application of best practice in manufacturing. The analysis ultimately returns a Component Manufacturing Variability Risk qm. The underlying notion of qm is that an ideal design exists with regard to tolerance where the risk index is unity indicating that variability is in control. Risk indices greater than unity exhibit a greater potential for variability during manufacture. Central to the determination of qm is the use of the process capability maps showing the relationship between the achievable tolerance and the characteristic dimension for a number of manufacturing processes and material combinations. Component Assembly Variability Risks Analysis - Too often assembly is overlooked when assessing the robustness of a design. DFA techniques offer the opportunity for part count reduction through a structured analysis of the assembly sequence but they do not specifically address variability within assembly processes. A component s assembly situation involves the following process issues - Handling characteristics Ap. - Fitting placing and insertion characteristics Zp. - Additional assembly considerations welding soldering etc. p. - Whether the .

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