Management of risks related to the lack of compliance with a dimensional tolerance in a tolerance chain

An automatic risk management tool for managing risks related to lack of compliance with at least one dimensional tolerance in a tolerance chain in context of industrially assembling a product from a set of parts, the tolerance chain being defined by a tolerance model relating input characteristic values representative of tolerances of the parts to be assembled to output requirement values representative of requirements for the assembled parts, the input characteristic values and the output requirement values being associated with input tolerances and output tolerances, respectively, the tool comprising a processor configured to:

• select an input characteristic, which is a target characteristic, a contribution of which in the tolerance chain is greater than a predetermined contribution threshold;
• replace a value of the target characteristic with a test value from among a series of test values that are representative of potential measurement values;
• determine an output statistical distribution according to each test value assigned to the target characteristic thus forming a set of output statistical distributions;
• measure a portion of lack of compliance with the tolerances associated with the output requirements for each output statistical distribution;
• evaluate a first indicator of an impact of risk of lack of compliance with the tolerances that are associated with the output requirements according to each test value assigned to the target characteristic;
• evaluate a second indicator of a severity of risk representing a weighting of the first indicator of the impact of the risk with a probability of occurrence of a corresponding test value assigned to the target characteristic;
• and
• define a set of sorting criteria which is graduated on a basis of the first indicator and the second indicator.