Analysis and optimization of traveling wave of large diamond core drill bit
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摘要: 对大型金刚石薄壁钻头在钻切中出现的振动和噪声问题,用Ansys Workbench有限元软件对无开孔、开孔、夹层和安装定位轮的薄壁钻头进行模态分析,进一步用行波振动理论计算薄壁钻头共振裕度,分析避开行波共振的效果。研究开孔、夹层对行波振动的影响。结果表明:钻切转速为186.72 r/min时,无开孔薄壁钻头的为0,出现后行波共振。在无开孔薄壁钻头出现后行波共振固有模态的变形大的区开孔,开8组圆孔(每组3个)和开8个S形孔薄壁钻头的为4.97%,避开行波共振效果良好;开孔且夹层薄壁钻头的为5.72%,避开行波共振效果最好。为提高加工孔的精度,在薄壁钻头周围安装定位轮,分析定位轮数对行波振动的影响,其中安装6个和12个定位轮薄壁钻头的分别为4.27%和4.47%,避开行波共振效果好,比较2个到12个定位轮数薄壁钻头的,而且考虑安装方便,最后确定最佳安装定位轮数是6。Abstract: For the vibration and noise issues that occur during drilling of large diamond core drill bits, modal analysis was conducted using Ansys Workbench finite element software on core drill bits without openings, openings, interlayers, and installation of positioning wheels. Furthermore, the resonance margin/δ of core drill bits was calculated using traveling wave vibration theory to analyze the effect of avoiding traveling wave resonance. Study the influence of openings and interlayers on traveling wave vibration. The results show that when the drilling speed is 186.72 r/min, the δ of the no opening core drill bit is 0, and a backward traveling wave resonance occurs. In the area where there is a large deformation of the inherent mode of traveling wave resonance in the no opening core drill bit, the δ of opening 8 sets of circular holes (3 in each group) and 8 S-shaped holes in the core drill bit is 4.97%, which avoids traveling wave resonance effectively; The δ of the opening and sandwich core drill bit is 5.72%, which has the best effect of avoiding traveling wave resonance. In order to improve the accuracy of machining holes, positioning wheels are installed around the core drill bit, and the impact of the number of positioning wheels on traveling wave vibration is analyzed. Among them, the δ of installing 6 and 12 positioning wheel core drill bits is 4.27% and 4.47%, respectively, to avoid traveling wave resonance. Comparing the δ of 2 to 12 positioning wheel core drill bits and considering installation convenience, the optimal number of positioning wheels for installation is finally determined to be 6.
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