Research On Selective Assembly Optimization Of Engine Crank Linkage Mechanical For Quality Objective

In the assembly process of engine crank linkage mechanism,selective assembly methods are often used. In order to improve the matching success rate, the matching accuracy, and reduce product quality fluctuation,based on the analysis of engine crank linkage assembly process,got the dimension chain which affect the assembly quality of the engine crank linkage mechanism,laid the foundation for the establishment of the matching model.According to the characteristics of different parts maybe have different numbers of size,designed a flexible coding system which included identity area and size information area,introduced the RFID and bar code coding information storage and collection technology.Considering the multiple quality characteristics of parts, established the multivariate quality loss function of parts.Considering the multivariate quality loss of parts and quality loss which was caused by deviation between a closed loop size and target,established a quality function which can represent product quality.Considering the coordination between product quality fluctuation, matching success rate and matching precision, with the goal of maximizing the multi-assembly index Q, a new selective model was established. Optional parts was abstracted as nodes of matching model, the Ant Colony Algorithm was used to optimize the selective assembly problem.Then an example of crank was taken to verify the feasibility and effectiveness of the model.Finally, a computer-aided selective assembly system for engine crank linkage mechanism was developed.