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设计单颗磨粒磨削装置,通过超景深显微镜观测单颗立方氮化硼(CBN)磨粒的磨损现象,分析CBN磨粒磨损状态的变化规律及原因。研究表明,钎焊CBN磨粒磨削合金渗碳钢20Cr Mo时,可将CBN磨粒磨损状态变化归纳为微观磨损、磨平、宏观破碎和失效4种形式。由于磨粒的磨损规律受磨粒表面形貌、磨粒的突出高度及磨削深度的影响,每个CBN磨粒的磨损形式不尽相同。在单颗粒磨削过程中,磨削深度对磨粒破碎形式有较大的影响,在磨削深度较小时,磨粒磨损以微观磨损和磨平为主;在磨削深度较大时,磨粒磨损以宏观破碎为主,并导致磨粒的失效。
Designing a single abrasive grinding device, observing the wear phenomenon of the single cubic boron nitride (CBN) abrasive grains by a depth of field microscope, and analyzing the change rule and the reason of the wear states of the CBN abrasive grains. The results show that when the brazed CBN abrasive grain is used to grind the carburized steel 20Cr Mo, the wear state of the CBN abrasive grains can be summarized into four types: micro-abrasion, smoothing, macro-breakage and failure. Due to the wear rules of abrasive particles are affected by the surface morphology of abrasive particles, the protruding height of abrasive particles and the depth of grinding, the wear patterns of each CBN abrasive particle are different. In the process of single particle grinding, the depth of grinding has a greater impact on the type of abrasive particle breakage. When the grinding depth is small, the abrasive wear is dominated by micro-abrasion and smoothing. When the grinding depth is large, Granular wear mainly to the macro-break, and lead to abrasive failure.