虑及颤振在线抑制的机床高效自适应加工技术研究
Research on High-efficiency Adaptive Machining Technology of Machine Tools Considering Online Chatter Suppression
刘阔 1姜业明 1黄任杰 1李明禹 1陈虎 2王永青1
作者信息
- 1. 大连理工大学高性能精密制造全国重点实验室 大连 116024
- 2. 科德数控股份有限公司 大连 116600
- 折叠
摘要
针对传统加工方式面对加工余量不均匀、去除量大的复杂结构件缺乏参数调控能力,难以提升加工效率的问题,提出一种虑及颤振在线抑制的机床高效自适应加工技术.首先,基于模糊理论开发二维模糊控制器,通过采集切削过程主轴功率信号,实时调节进给倍率来实现自适应加工.其次,以加权小波包熵为特征量,研究切削颤振在线识别方法,并建立切削系统单自由度模型,通过寻找加工系统不发生颤振的最佳主轴转速,依据颤振频率和刀齿数,实现基于变主轴转速的颤振抑制.然后,基于机床主轴电机功率、扭矩和转速关系,制定主轴转速和进给速度的调控策略,实现虑及颤振在线抑制的机床高效自适应加工.最后,通过两组切削对比试验对该技术进行验证,结果表明,所提高效自适应加工技术可以明显提升加工效率,并能抑制加工过程中的切削颤振.
Abstract
In the field of machining,there are a large number of complex structural parts with uneven machining allowances and large removals.Traditional machining methods lack the ability to control parameters and it is difficult to improve machining efficiency.A high-efficiency adaptive machining technology of machine tools considering online chatter suppression is proposed.First,based on fuzzy theory,a two-dimensional fuzzy controller is developed,which realizes the adaptive machining by collecting the spindle power signal during the machining process and adjusting the feed rate override in real time.Secondly,taking the weighted wavelet packet entropy as the characteristic value,the online identification method of cutting chatter is studied.A single-degree-of-freedom model of the machining system is established.By finding the optimal spindle speed without chattering in the machining system,based on the chatter frequency and the number of teeth,the chatter suppression based on the variable spindle speed is realized.Then,based on the relationship between the power,torque and speed of the spindle motor of the machine tool,the control strategy of the spindle speed and feed speed is formulated.And the high-efficiency adaptive machining of machine tools considering online chatter suppression is realized.Finally,the technology was verified by two sets of cutting comparison tests.The result shows that the technology can significantly improve the machining efficiency and suppress the cutting chatter during machining.
关键词
自适应加工/颤振识别/颤振抑制/模糊控制/加权小波包熵Key words
adaptive machining/chatter identification/chatter suppression/fuzzy control/weighted wavelet packet entropy引用本文复制引用
基金项目
国家自然科学基金(U22B2085)
辽宁省科技重大专项(2020JH1/10100016)
辽宁省科技重大专项(2021JH1/10400102)
辽宁省兴辽英才计划(XLYC1807081)
出版年
2024
NETL
NSTL
万方数据