tailieunhanh - Designing Capable and Reliable Products Episode 1 Part 3

Tham khảo tài liệu 'designing capable and reliable products episode 1 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Designing for quality 25 Figure The FMEA input into designing capable and reliable products Hence a critical characteristic is defined as one in which high variation could significantly affect product safety function or performance Liggett 1993 . In order to assess the level of importance of the characteristics in a design a process of identifying the critical characteristics and then using special symbols on the detailed drawing is commonly used. For example the symbol is used by some companies to indicate that a particular characteristic should be controlled during manufacture using SPC. The identification process is facilitated by the use of a design FMEA using multidisciplined teams. As seen in Figure the important results from an FMEA in terms of designing capable and reliable products are the potential failure modes severity rating and critical characteristics for the design. By identifying the capability of the critical characteristics and the potential failure mode a statistical analysis can then be performed to determine its reliability. The FMEA Severity Rating 5 is crucial for setting capability and reliability targets because it is a useful indication of the level of the safety required for the application. Although subjective in nature the effective use of an FMEA in the design process is advocated as it brings significant benefits. In summary to reduce risk at the product design stage requires that we do not speculate without supporting evidence on the causes consequences and solutions for an actual or potential design problem. This means making predictions where appropriate based on evidence from testing experience or other hard facte using statistical probabilities not vague guesses. The use of FMEA to evaluate all the potential risks of failure and their consequences both from normal use and foreseeable misuse is a key element in designing capable and reliable products Wright 1989 . Designing for quality The improvement of the quality