Grinding performance evaluation of porous composite-bonded CBN wheels for Inconel 718  

作　　者：Chen Zhenzhen Xu Jiuhua Ding Wenfeng Ma Changyu 

机构地区：[1]College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics [2]Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology

出　　处：《Chinese Journal of Aeronautics》2014年第4期1022-1029,共8页中国航空学报（英文版）

基　　金：co-supported by the Natural Science Foundation of China(No.51235004);Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)of China;the Fundamental Research Funds for the Central Universities:Funding for Outstanding Doctoral Dissertation of China(No.BCXJ10-08);Funding for Jiangsu Innovation Program for Graduate Education of China(No.CX10B-090Z-05);Foundation of Graduate Innovation Center at NUAA of China(No.kfjj130120)

摘　　要：For high-efficiency grinding of difficult-to-cut materials such as titanium and nickel alloys, a high porosity is expected and also a sufficient mechanical strength to satisfy the function.However, the porosity increase is a disadvantage to the mechanical strength. As a promising pore forming agent, alumina bubbles are firstly induced into the abrasive layer to fabricate porous cubic boron nitride（CBN） wheels. When the wheel porosity reaches 45%, the bending strength is still high up to 50 MPa with modified orderly pore distribution. A porous CBN wheel was fabricated with a total porosity around 30%. The grinding performance of the porous composite-bonded CBN wheel was evaluated in terms of specific force, specific grinding energy, and grinding temperature, which were better than those of the vitrified one under the same grinding conditions. Compared to the vitrified CBN wheel, clear straight cutting grooves and less chip adhesion are observed on the ground surface and there is also no extensive loading on the wheel surface after grinding.For high-efficiency grinding of difficult-to-cut materials such as titanium and nickel alloys, a high porosity is expected and also a sufficient mechanical strength to satisfy the function.However, the porosity increase is a disadvantage to the mechanical strength. As a promising pore forming agent, alumina bubbles are firstly induced into the abrasive layer to fabricate porous cubic boron nitride（CBN） wheels. When the wheel porosity reaches 45%, the bending strength is still high up to 50 MPa with modified orderly pore distribution. A porous CBN wheel was fabricated with a total porosity around 30%. The grinding performance of the porous composite-bonded CBN wheel was evaluated in terms of specific force, specific grinding energy, and grinding temperature, which were better than those of the vitrified one under the same grinding conditions. Compared to the vitrified CBN wheel, clear straight cutting grooves and less chip adhesion are observed on the ground surface and there is also no extensive loading on the wheel surface after grinding.

关 键 词：Alumina bubbles Bending strength Cubic boron nitride （CBN）Porosity Specific force Specific grinding energy 

分 类 号：TB383.4[一般工业技术—材料科学与工程] TG580.6[金属学及工艺—金属切削加工及机床]