基于ABAQUS的PDC高速切削岩石机理研究
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摘要
随着理论探究与材料性能的提升,高速切削技术在硬材料加工领域取得了良好的应用,部分研究者开始尝试将其应用到钻进中来。为探究高速条件下PDC刀具切削机理,利用ABAQUS软件模拟了高速条件下PDC刀具切削岩石的过程,从温升、应力、能量变化及切屑形成机制4个方面对高速切削模型进行了研究。通过对比研究发现:随着切削速度增加,以压碎作用为主的塑性破岩方式开始转化为以切削作用为主的脆性破坏形式;刀具表面的温度也来越低,刀具表面应力开始趋于稳定;表征切削效率的机械比能持续下降,切削效率大幅度提高。研究结果可以为高速切削技术的进一步研究和现场应用提供理论基础。
With the theoretical exploration and material performance improvement,high-speed cutting technology has achieved great application in the field of hard material processing. Some researchers have begun to try to apply it to well drilling. To understand the cutting mechanism of PDC cutter under high speed conditions,the process of rock cutting by PDC cutter under high speed condition was simulated by ABAQUS software. High-speed cutting model was researched by temperature rising,stress,energy change and mechanism of chip formation.Through comparative study,it was found that with the increase of cutting speed,the plastic rock breaking method based on crushing began to transform into the brittle failure mode dominated by cutting action. The temperature of the tool surface becomes lower and the surface stress of the tool begins to stabilize. The mechanical specific energy characterizing cutting efficiency continues to decrease. The cutting efficiency is greatly improved. The research results can provide a theoretical basis for further research and field application of high-speed cutting technology.
With the theoretical exploration and material performance improvement,high-speed cutting technology has achieved great application in the field of hard material processing. Some researchers have begun to try to apply it to well drilling. To understand the cutting mechanism of PDC cutter under high speed conditions,the process of rock cutting by PDC cutter under high speed condition was simulated by ABAQUS software. High-speed cutting model was researched by temperature rising,stress,energy change and mechanism of chip formation.Through comparative study,it was found that with the increase of cutting speed,the plastic rock breaking method based on crushing began to transform into the brittle failure mode dominated by cutting action. The temperature of the tool surface becomes lower and the surface stress of the tool begins to stabilize. The mechanical specific energy characterizing cutting efficiency continues to decrease. The cutting efficiency is greatly improved. The research results can provide a theoretical basis for further research and field application of high-speed cutting technology.
引文
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[12]MIN-SEOK B,HEE-SUB P.Effect of diamond particle size on the microstructure and wear property of high pressure high temperature(HPHT)sintered polycrystalline diamond compact(PDC)[J].Korean Journal of Metals and Materials,2017,11:790-797.
[2]查春青,枊贡慧,李军,等.PDC钻头扭转振动特性分析及减振工具设计[J].石油机械,2017,45(3):1-5.ZHA C Q,LIU G H,LI J,et al.Analysis of torsional vibration characteristics of PDC bit and design of the damping tool[J].China Petroleum Machinery,2017,45(3):1-5.
[3]LIU W J,ZHU X H,LI B.The rock breaking mechanism analysis of rotary percussive cutting by single PDCcutter[J].Arabian Journal of Geosciences,2018,11:192.
[4]AKBARI B,MISKA S.The effects of chamfer and back rake angle on PDC cutters friction[J].Journal of Natural Gas Science and Engineering,2016,35:347-353.
[5]SCOTT T A.The influence of microstructure on the mechanical properties of polycrystalline diamond:a literature review[J].Advances in Applied Ceramics,2018(3):161-176.
[6]张志军,贾春德.超高速切削机理的研究[J].沈阳工业学院学报,1999,18(1):41-45.ZHANG Z J,JIA C D.Study on the mechanism of ultrahigh speed cutting[J].Journal of Shenyang Institute of Technology,1999,18(1):41-45.
[7]赵鹏,赵旭.超高速切削的技术体系、技术现状和发展趋势[J].应用技术,2012(8):84-87.ZHAO P,ZHAO X.Technical system,technology status and development trend of ultra-high speed cutting[J].Applied Technology,2012(8):84-87.
[8]YARI N,KAPITANIAK M,VAZIRI V,et al.Calibrated FEM modelling of rock cutting with PDC cutter[C].MATEC Web of Conferences 148,16006,2018.
[9]YAN W.Single PDC cutter force modeling for hard rock cutting[M].New Mexico:New Mexico Institute of Mining and Technology Socorro,1997.
[10]XUE J,XIA Y,JI Z,et al.Soft rock cutting mechanics model of TBM cutter and experimental research[C]∥XIE M,XIONG Y,XIONG C,et al.Intelligent robotics and applications.Berlin Heidelberg:Springer,2009:383-391.
[11]HARELAND G,YAN W,NYGAARD R,et al.Cutting efficiency of a single pdc cutter on hard rock[J].Journal of Canadian Petroleum Technology,2009(6):60-65.
[12]MIN-SEOK B,HEE-SUB P.Effect of diamond particle size on the microstructure and wear property of high pressure high temperature(HPHT)sintered polycrystalline diamond compact(PDC)[J].Korean Journal of Metals and Materials,2017,11:790-797.