纳米硬质合金和岩石的摩擦磨损与切削性能  

Friction,wear and cutting performance of nano cemented carbide and rock

作　　者：郐吉才[1] 

机构地区：[1]河南理工大学机械与动力工程学院,焦作454000

出　　处：《复合材料学报》2013年第S1期230-235,共6页Acta Materiae Compositae Sinica

基　　金：河南省教育厅科学技术研究重点研究项目(No.13A460341)

摘　　要：摩擦磨损性能对刀具耐磨性有极其重要影响。利用在线电解修整(Electrolytic In process Dressing,ELID)磨削技术对纳米硬质合金刀具进行了磨削,应用摩擦磨损试验机研究了纳米硬质合金WC-10Co和岩石的摩擦磨损性能。应用纳米硬质合金刀具对大理石进行了切削加工,研究了纳米刀具的切削性能。结果表明,纳米硬质合金整体摩擦系数低,耐磨性好,WC-10Co的磨损机理表现为鱼鳞状塑性流动,普通硬质合金磨损机理则是晶粒大片脱落。在低速切削时,纳米硬质合金刀具耐用度较普通硬质合金提高0.5-1倍,更适于低速加工硬脆材料。显微分析表明,纳米硬质合金刀具磨损机理是磨粒磨损和岩石中脱落的硬质点楔入WC晶粒之间的Co相里引起硬质相WC脱落。由于纳米硬质合金的优异性能,有望成为地质资源钻探领域的新型刀具。Performances of nano-cemented carbide such as friction and wear is important for its development and potential application.In this paper,an experiment was conducted to study the grinding property of nano-metric cemented carbide by means of ELID grinding.The friction and wear of nano-cemented carbide was evaluated on frictional wear testing machine.And the rock were cut with nano cemented carbide,and the cutting properties of nano cemented carbide were studied.Results show,the nano-cemented carbide cutter showed lower coefficients of friction and higher resistance to wear.The abrasive mechanism of WC-10Co is of fish-scale plastic flow.And the abrasion mechanism of common-cemented carbide cutter is that grains have fallen off.The tool life of nano cemented carbide is 0.5-1times longer than that of common cemented carbide at low cutting speed.Which means the nano cemented carbide is more suitable for machining hard and brittle material than common cemented carbides at low cutting speed.And the microscopic analysis showed,the mechanism of tool wear is the abrasive wear as well as the shedding of WC hard phase within Co phase caused by the hard spots shed from the rock embedding in the internal part of binder phase Co which is located in the hard phase WC.Due to the excellent properties of nano cemented carbide,and it is expected to become new tools in the geological resources drilling field.

关 键 词：摩擦 磨损 纳米硬质合金 岩石 ELID磨削技术 刀具耐用度 

分 类 号：TG135.5[一般工业技术—材料科学与工程]