切削过程的自适应模糊控制

针对恒力切削过程自适应控制,设计了包括切削过程的闭环控制系统.对于具有高度非线性、随机干扰严重的复杂动态过程,采用在线调整参数的自适应模糊控制器,并应用虚拟加工过程建立模型和预报切削力.通过对切削力的检测获取切削过程的特征信息,用切削力比确定进给速度调整率,以切削力偏差和偏差变化率作为评价指标,实现恒力切削过程的自适应控制.仿真和切削试验表明,系统具有良好的切削力控制精度和稳定性,在提高金属切除率时有效地降低了刀具破损的发生.

Self-Adaptive Fuzzy Control for Cutting Process

A close-loop control system including cutting process control was designed to accomplish adaptive control of constant force cutting process.For complicated dynamic process which is severely nonlinear and has much stochastic disturbance,fuzzy adaptive controller was used which can adjust parameters online.Virtual machining was applied to make models and forecast the cutting force.By measuring cutting force,characteristic information of cutting process was acquired.Regulation factor of feed rate is determined by cutting force ratio and force deviation,whose change rates are used as evaluation indices.Thus,adaptive control of constant force cutting process is accomplished.Simulation and cutting test indicates that the system has high precision and stability,and reduces cutter failures efficiently on condition that metal removal rate(MRR) increases.