摘要
针对PCBN刀具车削镍基高温合金GH4169中颤振对加工效率和质量的影响,建立一种根据切削参数有效判定切削状态的方法。首先建立了二自由度外圆车削再生颤振模型,然后利用锤击法对数控车床的刀具系统进行模态试验,测定了1阶频率、模态阻尼、模态刚度、模态质量等模态参数;设计了二自由度外圆车削再生颤振MATLAB/Simulink仿真模型,根据仿真结果预测了稳定极限切削深度和颤振的主振方向。最后利用PCBN刀具进行变切深试验。试验结果表明,仿真模型正确。
Contraposed the vibrational impacts on the cutting process efficiency and quality in the turning of nickelbased superalloy GH4169, a method was presented for valid judgment of cutting condition which is according to the cutting parameter. The two-degrees-freedom turning vibration model was primarily established. Then the test of modal analysis was conducted by hammering method for numerical control lathe tool system, the parameters such as the first frequency, modal damping, modal stiffness, modal mass and so on had been measured. The model to simulate the cutting process was designed based on MATLAB/Simulink platform. The stable limit cutting depth and main vibration direction of the flutter were predicted according to the simulation results. At last, the experiment of varying cutting depth was carried out with PCBN tool which verified the correction of simulation. To sum up, the simulation model has certain references in the prediction of the regenerative chatter and the optimization of cutting process for nickel-based superalloy GH4169.
出处
《机械科学与技术》
CSCD
北大核心
2016年第2期260-266,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
复杂轨迹加工工艺及装备教育部工程研究中心开放课题项目(2015CTP05)资助
关键词
镍基高温合金
PCBN刀具
再生颤振
模态试验
稳定极限切削深度
Nickel-based superalloy, PCBN cutting tool, Regenerative Chatter, stable limit cutting depth, test of modal analysis
