大型金刚石薄壁钻头行波振动分析及优化  

Analysis and optimization of traveling wave vibration of large diamond thin-wall drill bits

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作  者:刘兴东 张德臣[1] 王育博 高先一 马国清 LIU Xingdong;ZHANG Dechen;WANG Yubo;GAO Xianyi;MA Guoqing(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China)

机构地区:[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051

出  处:《金刚石与磨料磨具工程》2024年第4期485-494,共10页Diamond & Abrasives Engineering

摘  要:针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、开孔且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δ,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187.32 r/min时,无开孔薄壁钻头的共振裕度δ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变形大的区域开8组圆孔(每组3个)和8个S形孔,薄壁钻头的共振裕度δ为5.18%,避开行波共振效果良好;开孔且夹层的薄壁钻头的共振裕度δ为6.11%,避开行波共振效果最好。为提高孔的加工精度,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,发现安装6个和12个定位轮的薄壁钻头的共振裕度δ分别为4.59%和4.79%,避开行波共振效果好。比较2~12个定位轮薄壁钻头的共振裕度δ,而且考虑安装方便,最后确定最佳安装定位轮数为6个。Objectives:To reduce the vibration and noise generated by thin-walled drill bits during the drilling and cut-ting process,various designs of thin-walled drill bits were studied,including conventional thin-walled drill bits,open-hole thin-walled drill bits,open-hole and interlayer thin-walled drill bits,and thin-walled drill bits with positioning wheel.The reasons for vibration and noise reduction of thin-walled drill bits in different schemes were analyzed at a the-oretical level.A new scheme for thin-walled drill bits was proposed,which exhibited good vibration reduction effects,protected the hearing of thin-walled drill bit operators,and complied with China's environmental indicators for workers.Methods:Modal analysis and traveling wave vibration analysis of thin-walled drill bits were performed using Work-bench software to study the effects of different thin-walled drill bit designs on traveling wave vibration.First,a solid work model of the thin-walled drill bit was imported into Workbench software and meshed.The inner hole of the thin-walled drill bit was constrained(cantilever type),and the first 30-order modes of the thin-walled drill bit were calcu-lated under standard earth gravity.Using traveling wave vibration theory,theδvalue of the resonance margin of the thin-walled drill bit in different schemes was calculated to determine the effectiveness of avoiding traveling wave resonance.Results:At a drilling speed of 187.32 r/min,the conventional thin-walled drill bit had aδvalue of 0,leading to rear traveling wave resonance.The opening of 8 groups of round holes and 8 S-hole thin-walled drill bits had aδvalue of 5.18%,which was the best opening design scheme.Further interlayering the thin-walled drill bit resulted in aδvalue of 6.11%,showing the best effect in avoiding traveling wave resonance.In theδwhere 2 to 12 positioning wheels thin-walled drill bits were installed,theδof 2,3 and 11 positioning wheels thin-walled drill bits was less than 1.00%,effect-ively avoiding traveling wave resonance.Conclu

关 键 词:金刚石薄壁钻头 开孔夹层 定位轮 行波振动 

分 类 号:TG713.1[金属学及工艺—刀具与模具] TG74[化学工程—高温制品工业] TQ164

 

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