论文部分内容阅读
针对数控强力切削中颤振问题,建立了包含切削过程颤振环节的数控强力切削伺服系统数学模型.对模型的理论分析、计算机仿真及正交试验验证表明:增大位置环增益Kpp可提高机床快速跟踪性能,减小速度环积分时间常数τs能迅速消除系统静差,但极限切削宽度blim会随之而下降;过大或过小的速度环增益Kps都会导致blim下降;优化调节伺服系统Kpp,τs和Kps可提高系统的动、静态特性及blim.正交实验优化伺服系统参数方法简单可行,能有效地提高切削系统稳定性和极限切削宽度,适用于重型机床的数控强力切削.
Aiming at the problem of flutter in NC powerful cutting, a mathematical model of CNC powerful cutting servo system including flutter in the cutting process is established.The theoretical analysis, computer simulation and orthogonal test of the model show that increasing the position loop gain Kpp can improve the machine tool Fast tracking performance, reduce the speed loop integral time constant τs can quickly eliminate the system static error, but the limit cutting width blim will be followed; oversized or too small speed loop gain Kps will lead to blim decline; optimal adjustment servo system Kpp , τs and Kps can improve the dynamic and static characteristics of the system and blim.Orthogonal experiments to optimize the parameters of the servo system are simple and feasible, which can effectively improve the stability of the cutting system and the ultimate cutting width, which is suitable for CNC heavy cutting of heavy machine tools.