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When pattern of fits are not designed following the boundary condition design criterion, the rejection rate due to failure in assemblability need to be considered. Since in a pattern of fits it is not possible to define an assembly equation it is not trivial to create a tolerance stack-up. The paper proposes a strategy to achieve a generalized rejection rate computation for \(nx\) patterns based on an interpolation model derived from Monte Carlo simulations. The rejection rate as function of the number of element in the pattern is simulated for different size and location tolerances. An exponential convergent function is fitted to the data and a generalize regression model is used to estimate the function parameters. Validation of the proposed methodology is provided. Moreover, future development are outlined.

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Towards an Analytical Generalization for Conformity Rate Estimation of Shaft-Hole Pattern Fit not Compliant with the Boundary Condition Design Criterion

  • 会议论文

  • 发表日期：

    2025年

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  • Mattia Maltauro,
  • Davide Fontana,
  • Roberto Meneghello,
  • Gianmaria Concheri

摘要

When pattern of fits are not designed following the boundary condition design criterion, the rejection rate due to failure in assemblability need to be considered. Since in a pattern of fits it is not possible to define an assembly equation it is not trivial to create a tolerance stack-up. The paper proposes a strategy to achieve a generalized rejection rate computation for \(nx\) patterns based on an interpolation model derived from Monte Carlo simulations. The rejection rate as function of the number of element in the pattern is simulated for different size and location tolerances. An exponential convergent function is fitted to the data and a generalize regression model is used to estimate the function parameters. Validation of the proposed methodology is provided. Moreover, future development are outlined.