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Reliability modeling-based tolerance design and process parameter analysis considering performance degradation

机译：考虑性能下降的可靠性建模的公差设计和过程参数分析

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摘要

Tolerance design and process parameter analysis have been widely used for reducing the fluctuation of product quality characteristics (QCs). Most existing works focus on finding the best compromise between manufacturing cost and tolerance of QCs. However, the performance degradation of products will lead to QCs deviating from design specifications, which is ignored in current researches. Motivated by the stress relaxation process of helical springs, we propose a more reliable tolerance design and process parameter analysis considering performance degradation. An accelerated degradation model is first constructed to reflect the degradation process of helical springs and the influence of the initial free length. Subsequently, considering the given reliability constraint, a tolerance design method based on degradation performance is developed to guide the quality improvement of helical springs. Furthermore, a new reliability model embodied with the influence of parameter fluctuation is proposed, and an allowable fluctuation range for the deviation and variance of the initial free length is derived, based on which the process parameter can be optimized to improve the manufacturing process. Finally, a real case study of helical springs is conducted to illustrate the implementation and effectiveness of the proposed method.
机译：公差设计和工艺参数分析已被广泛用于降低产品质量特征（QCS）的波动。大多数现有的作品侧重于在制造成本和QCS的宽容之间找到最佳折衷。然而，产品的性能下降将导致QCS偏离设计规格，这在当前研究中被忽略。通过螺旋弹簧的应力松弛过程的推动，考虑到性能下降，提出了更可靠的公差设计和工艺参数分析。首先构造加速的降解模型以反映螺旋弹簧的劣化过程和初始自由长度的影响。随后，考虑到给定的可靠性约束，开发了基于劣化性能的公差设计方法，以指导螺旋弹簧的质量改进。此外，提出了一种具有参数波动影响的新的可靠性模型，并且导出了初始自由长度的偏差和方差的允许波动范围，基于该过程可以优化处理参数以改善制造过程。最后，进行了对螺旋弹簧的真实研究以说明所提出的方法的实现和有效性。

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