Designing Tolerance of Assembled Components Using Weibull Distribution

Tolerancing is one of the most important tools for planning, controlling, and improving quality in the industry.In order to meet the customer needs and enhance product and service quality, the design engineers use handbooks to determine the tolerance. Although the use of the statistical methods to determine the tolerance is not a new concept, the engineers for this purpose typically use the known statistical distributions such as the normal distribution. However, if the statistical distribution of the variable is unknown, a new statistical method is used. Therefore, we want to offer a flexible and proper statistical method to determine the tolerance of components of a product to enhance its performance. In this regard, Weibull distribution is proposed. To illustrate the proposed method first technical characteristics of production components were selected randomly, and thenmanufacturing parameters were determined using maximum likelihood method.Finally, the Goodness of Fit test was used to ensure the accuracy of the obtained results.