关键词: 大型发动机缸体翻转, 夹持结构设计, 多工序, 多目标优化, 大允差

Abstract: In the production and processing of large-scale and heavy equipment,the existing upending machine structure fails to meet the practical needs for multi-angle positioning and processing of cylinder block in engines weighting over 10 t. To address this practical issue,a multi-objective optimization model was proposed,with the comprehensive design objectives of the clamping structure′s load-bearing capacity,the mechanism′s self-weight,and the adaptive assembly capability. A heavy-duty upending machine was designed,whose mechanical structure capable of rotating and upending in both counterclockwise and clockwise directions at ±30°/±60° /±90°/±180°,with a load capacity of 15 t. It can automatically center within a clamping error of 8 mm,achieving precise positioning and stable clamping for large-scale engine blocks with multi-process,large-tolerance,and ensuring the processing of engine blocks with multiple dimensions and steps. Through simulation analysis using ANSYS WorkBench software and modeling and calculation with Matlab software,the minimum weight design with a deformation within 7 mm was obtained. Moreover,the on-site performance of the product has been proven that the structure and equipment can achieve the design goals and functions. The design of the large-tolerance clamping structure for multi-process large-scale upending machines can also provide a reference for the design of other large engine upending structures.

Key words: upending of large-scale engine blocks, clamping structure design, multi-process, multi-objective optimization, large-tolerance