TAILIEUCHUNG - Six Sigma Projects and Personal Experiences Part 12

Tham khảo tài liệu 'six sigma projects and personal experiences part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 156 Six Sigma Projects and Personal Experiences Fig. 4. Schematic total variation in manufacturing of total variation GR R rGageR RỴ I ------ x 100 I TV r I _ơR R__ Lt2 rr2 Ỵ product R R X 100 3 contribution to total variance Contribution GR R I GageR R IX100 I ĩằ _ IX100 I TV2 lơ2 ơ2 Pr oduct R R J 4 These metrics give an indication of how capable the gage is for measuring the critical to quality characteristic. Acceptable regions of gage R R as defined by the Automotive Industry Action Group Measurement Systems Analysis Workgroup Automotive Inductry Action Group 1998 are as indicated in table 2. GAGE R R RANGE ACTION REQUIRED 10 Gage acceptable 10 Gage R R 30 Action required to understand variance 30 Gage R R Gage unacceptable for use and requires improvement Table 2. Acceptable regions of Gage R R. Note that similar equations can be written for the individual components of variance and also for the product contribution by replacing ƠR R with ơrepeatability reproducibility and ơproduct respectively. Once the MSA indicates that the measurement method is both sufficiently accurate and capable it can be integrated into the remaining steps of the DMAIC process to analyse improve and control the characteristic. 3. Review of existing methodologies employed for MSA Historically gages within the manufacturing enviornment have been manual devices capable of measuring one single critical to quality characteristic. Here the components of 157 Gage Repeatability and Reproducibility Methodologies Suitable for Complex Test Systems in Semi-Conductor Manufacturing variance are a the repeatability on a given part and b the reproducibility across operators or appraiser effect. To estimate the components of variance in this instance a small sample of readings is required by independent appraisers. Typical data collection operations comprised of 5 parts measured by each of 3 are three widely used methods in use to analyse the collected data. These are the

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