速度、加速度及加加速度对S形缘条加工时间的影响

Influence of Feed Velocity, Acceleration and Jerk on Processing Time of S–Shaped Fillet

在航空结构件的加工中,除进给速度外,进给加速度和加加速度同样对加工效率具有重要影响。以S形试件S形缘条精加工为例,采用科德GNC61数控系统研究了进给速度、加速度及加加速度对加工时间的影响规律,分析了提高速度、加速度及加加速度对机床误差及S形试件加工误差可能产生的影响。结果表明,速度、加速度及加加速度的提高有效降低了S形缘条的加工时间,进给速度由1000mm/min提高到5000mm/min,加速度进一步由0.1m/s;提高到1.0m/s^(2),加速度建立时间进一步由200ms缩短到20ms,S形缘条的加工时间分别缩短24.20%、25.38%和41.84%。提高速度、加速度及加加速度造成的问题是指令频宽增宽及激励成分增多,使得机床跟随误差及联动轨迹误差的控制难度增大,并易于激起机床机械结构振动。

In the processing of aerospace structural parts, in addition to the feed velocity, the feed acceleration and jerk also have an important influence on the processing time. Taking the finishing process of the S–shaped fillet of the S–shaped test piece as an example, the influence of the feed velocity, acceleration and jerk on the processing time was studied using the Kede GNC61 CNC system. The possible effects of increasing velocity, acceleration and jerk on machine tool errors and S–shaped machining errors are analyzed. The results show that the increase of velocity, acceleration and jerk effectively reduces the processing time of S–shaped fillet. The feed velocity is increased from 1000mm/min to 5000mm/min, the acceleration is increased from 0.1m/s^(2) to 1.0m/s;, the acceleration establishment time is shortened from 200ms to 20ms, and the processing time of the S–shaped fillet is shortened by 24.20%, 25.38% and 41.84%. The problems caused by increasing speed, acceleration and jerk are increased setpoints bandwidth and increased excitation components. This makes it more difficult to control the tracking error and trajectory error of the machine tool, and it is easy to excite the vibration of the machine tool mechanical structure.