Grain erosion wear properties and grinding performance of porous aggregated cubic boron nitride abrasive wheels  

作　　者：Biao ZHAO Xin WANG Wenfeng DING Yang WANG Yucan FU Yanjun ZHAO Jianhui ZHU 

机构地区：[1]National Key Laboratory of Science and Technology on Helicopter Transmission,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]State Key Laboratory of Superabrasives,Zhengzhou Research Institute for Abrasive&Grinding,Zhengzhou 450001,China

出　　处：《Chinese Journal of Aeronautics》2023年第6期446-459,共14页中国航空学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51921003,92160301 and 52175415);the Fundamental Research Funds for the Central University(No.NP2022441);the Natural Science Foundation of Jiangsu Province(No.BK20210295);the Open Foundation State Key Laboratory of Mechanical Transmissions(No.SKLMT-MSKFKT-202101).

摘　　要：Cubic boron nitride(cBN)superabrasive grinding wheels exhibit unique advantages in the grinding of difficult-to-cut materials with high strength and toughness,such as titanium alloys and superalloys.However,grinding with multilayered metallic cBN superabrasive wheels faces problems in terms of grain wear resistance,the chip storage capability of the working layers and the stability and controllability of the dressing process.Therefore,in this work,novel metallic cBN superabrasive wheels with aggregated cBN(AcBN)grains and open pore structures were fabricated to improve machining efficiency and surface quality.Prior to the grinding trials,the airborne abrasive blasting process was conducted and the abrasive blasting parameters were optimized in view of wear properties of cBN grains and metallic matrix materials.Subsequently,the comparative experiments were performed and then the variations in grinding force and force ratio,grinding temperature,tool wear morphology and ground surface quality of the multilayered AcBN grinding wheels were investigated during machining Ti-6Al-4V alloys.In consideration of the variations of grain erosion wear volume and material removal rate per unit of pure metallic matrix materials as the abrasive blasting parameters changes,the optimal abrasive blasting parameters were identified as the SiC abrasive mesh size of 60#and the abrasive blasting distance and time of 60 mm and 15 s,respectively.The as-developed AcBN grains exhibited better fracture toughness and impact resistance than monocrystalline cBN(McBN)grains because of the existence of metal-bonded materials amongst multiple cBN particles that decreased crack propagation inside whole grains.The metallic porous AcBN wheels had lower grinding forces and temperature and better ground surface quality than vitrified McBN wheels due to the constant layer-by-layer exposure of cBN particles in the working layer of AcBN wheels.

关 键 词：Air-borne abrasive blasting Aggregated cBN abrasive grains Grinding performance Ground surface quality Self-sharpening ability 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程] TG743[金属学及工艺—刀具与模具]