工程陶瓷脆性域旋转超声磨削加工切削力研究

Investigation of the cutting force of rotary ultrasonic grinding machining in the brittle regime for engineering ceramics

为了解决由于工艺参数取值范围和实验次数有限而造成的实验结果局限性,对工程陶瓷脆性域旋转超声磨削加工切削力进行了研究。在旋转超声磨削加工机理研究基础上,结合弹塑性力学和压痕断裂力学,采用动量定理和动能定理,推导了单个金刚石端面加工和侧面加工切削力计算公式,并建立了工程陶瓷脆性域旋转超声磨削加工切削力数学模型。最后通过实验对切削力数学模型进行验证,结果表明:切削力模型计算值与实验值误差低于8%,可满足工程应用,为工艺参数优化提供了依据。

The theoretical investigation of the cutting force of rotary ultrasonic grinding machining （RUGM） for engineering ceramics in a brittle regime was conducted for the purpose of solving the limitations of the experimental results due to the limited range of process parameters and the number of experiments. Based on the mechanism of RUGM, the formula of the cutting force caused by the bottom and side machining of a single diamond in the brittle regime was deduced by the theorem of linear momentum and kinetic energy, and was combined with the indentation fracture mechanics and elastic-plastic mechanics. Meanwhile, the mathematical model of the cutting force for RUGM in the brittle regime was established. Finally, the model was verified by the experiments. The results show that the error rate of the cutting force model between the calculation value and the experimental value is less than 8%. As a result, it can meet the demands of engineering applications. So it provides the foundation for process parameters optimization.