The assembly performance of precision structural threaded connections is significantly influenced by the threads' geometric parameters and the geometric form of the thread contact surface (TCS). due to the complex...
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The assembly performance of precision structural threaded connections is significantly influenced by the threads' geometric parameters and the geometric form of the thread contact surface (TCS). due to the complexity involved in the helical structure and surface form of the thread itself, establishing a 3d solid model that conforms to the actual machining conditions presents challenges. This study first proposes an accurate geometric error 3d modeling method for representing the non-uniform distribution error of the TCS. The non-contact optical measurement method obtained the point clouddata containing the actual machining errors of the TCSs. Based on data processing, a 3ddistribution error model of the TCS was established using the NURBS surface numerical model. Using CAdmodeling, the 3dgeometricdistribution error was integrated with the ideal 3d solid model to create an accurategeometricdigital twin model of the thread. Then, anon- uniform distribution error evaluation method of TCSs was proposed to quantitatively evaluate the non-uniform distribution characteristics of the errors on the TCSs. The feasibility of the proposedmethod was validated by comparing the modeling and evaluation of normal-precision and high-precision threads. The simulation calculations results of ideal anderror bolted joints indicated that the non-uniform distribution errors on the TCS lead to local point contact or non-contact, and the resulting stress distribution is discontinuous and nonuniform. This study provides a practical approach for predicting and optimizing the performance of threaded connections.
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