关键词: 汽车发动机曲轴孔, 同轴度, 节能优化, 工艺参数, 镗削加工

Abstract: To address the issues of the coaxiality value of the automobile engine crankshaft holes was too large or even out of tolerance after boring, and the low energy efficiency of boring processes, a study of processing parameter energy-saving optimization for boring automobile engine crankshaft holes was conducted considering coaxiality. The influencing factors of coaxiality in boring crankshaft holes were analyzed and the coaxiality value prediction models were established based on the finite element methods and support vector machine regression algorithms. Then, the energy consumption characteristics of boring crankshaft holes were analyzed, and a boring parameter optimization model was established aiming at specific energy and maximum coaxiality value. The improved multi-objective dragonfly algorithm was used to solve the model and the optimal combination of processing parameters to balance energy efficiency and coaxiality was determined. Finally, the case study indicates that after the optimization, the maximum coaxiality value is reduced by 10.81%, and the specific energy is reduced by 4.61%, which verifies the effectiveness of the optimization model.

Key words: automobile engine crankshaft hole, coaxiality, energy-saving optimization, processing parameter, boring