BTA深孔钻杆振动特性及辅助支撑位置优化

2018-12-20

作者：张晓飞1，2，辛志杰1，2，史寅栋1，2，张鹏1，2，余少华1，2 单位：1中北大学；2山西省深孔加工工程技术研究中心

摘要：BTA深孔加工技术主要应用于特种制造领域，但大深径比的远跨钻杆系统刚度差，加工颤振现象突出，工件圆度质量难以精确控制。在实际加工中，远跨度钻杆辅助支撑位置对钻杆系统整体刚度和非线性振动现象有比较大的影响。理论研究表明，优化支撑点位置可以提高系统的整体刚度，抑制非线性振动源对钻杆系统产生干扰及刀具产生异常振动现象。利用模拟变更辅助支撑位置点得出钻杆系统的振动特性，结合钻杆系统静止和工作状态下的振动试验，使用迭代印证法保证模型建立的准确性。结果表明：6000mm长度的远跨BTA深孔钻杆系统支撑点位置存在一个随动优化区间，该区间的发现为BTA深孔制造领域提供了一定的研究理论和参考建议。

关键词：BTA深孔钻杆；辅助支撑位置；刚度；振动；圆度误差

中图分类号：TG937；TH161.1；TH161.6文献标志码：A

Vibration Characteristics and Auxiliary Support Position Optimization

of BTA Deep Hole Drill Pipe

Zhang Xiaofei，Xin Zhijie，Shi Yindong，Zhang Peng，Yu Shaohua

Abstract:BTA deep hole machining technology is mainly used in special manufacturing fields，but the longdiameter ratio of longdistance drill pipe system is poor in rigidity，the phenomenon of machining chatter is prominent，and the workpiece roundness quality is difficult to accurately control.In actual processing，it is found that the longspan drill pipe auxiliary support position has a greater impact on the overall stiffness and nonlinear vibration phenomena of the drill pipe system.Theoretical studies have also shown that optimizing the position of the support point can increase the overall stiffness of the system，inhibit the nonlinear vibration source from interfering with the drill pipe system and generate abnormal vibration of the tool.The vibration characteristics of the drillrod system are obtained by using simulation to change the auxiliary support position.Combined with the vibration test under the static and working conditions of the drillpipe system，an iterative verification method is used to ensure the accuracy of the model establishment.The results show that there is a followup optimization interval at the position of the support point of the farspan BTA deep hole drill pipe system 6000mm length.The discovery of this interval provides certain research theories and reference suggestions for the field of BTA deep hole manufacturing.

Keywords:BTA deep hole drill pipe；auxiliary support position；stiffness；roundness error