By Pier Giorgio DELLA ROLEThis presentation is an example of DFSS (Design For Six Sigma) where the main goal is how to identify, assess and reduce variation during the design process.
This simple example deals with the design of a pump to Six Sigma performance showing the application of robust design concepts, Monte Carlo simulation and tolerance design. In line with the DFSS methodology it is possible to predict (under certain assumption like the knowledge of the transfer function Y = f(X)) the defect rate of a subsystem in the early phases of the design process limiting the number of physical prototypes.
The design process is in three steps:
Solution 1: a set of nominal values for control factors are defined together with their low cost variation (Cpk = 0.79)
Solution 2: without tightening tolerances on the control factors, we adjust only their nominal values (Cpk = 1.30)
Solution 3: we reduce the output variation acting only on the factor that has more influence on the total variation (RSS law)
The analysis was completed with the help of Minitab.
Download: Design For Six Sigma (DFSS) Example For Pump Design and Tolerance
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About The Author
Pier Giorgio DELLA ROLE is a certified Master Black Belt. His current position is defining, training and implementing DFSS methodology for new products/services in Iveco SpA.
