基于离散元法的Al2O3基陶瓷刀具失效机理分析
2018-07-16
作者：赵百强，谷美林，刘蕊，杜浩，谷婷婷
单位：河北工业大学
摘要：本文基于离散元法，利用PFC2D软件分别建立陶瓷材料和工件材料真实的离散元模型，模拟氧化铝基陶瓷刀具在加工45钢的过程中刀具裂纹的形成、扩展及材料剥落的演化过程。采用单因素法分析了切削深度、切削速度、刀具前角和不同氧化铝基陶瓷材料对刀具磨损的影响，为提高加工质量和合理选择加工参数提供依据。结果表明：在一定范围内增大切削速度可以降低磨损量，提高加工效率；切削加工时应尽量选取合适的切削深度以减少刀具的磨损和延长刀具使用寿命，即采用小切削深度；刀具前角为-6°时可以获得更好的加工质量，并减少刀具磨损。
关键词：氧化铝基陶瓷刀具；刀具磨损；离散元法模拟；磨损量
中图分类号：TG54；TH14文献标志码：AAnalysis on Tool Wear Mechanism of Al2O3Based Ceramic Cutting Tool
Based on Discrete Element Method
Zhao Baiqiang，Gu Meilin，Liu Rui，Du Hao，Gu Tingting
Abstract:Based on the discrete element method and PFC2D software，the BPM models of ceramic material and of workpiece material are established.The evolution process of material peeling off and the crack extension is simulated.By using the single factor method，the cutting depth，cutting speed，cutting tool rake angle and different alumina ceramic material effects on tool wear are analyzed.The basis for improving the processing quality and choosing reasonable processing parameters is provided by this method.The results show that the increase of cutting speed can reduce the wear amount and improve the processing efficiency in a certain range.The right cutting depth to reduce attrition quantity，extend the service life of cutting tools should be chosen in machining，and the small cutting depth is used.In order to reduce tool wear and get the better processing quality of workpiece，the rake angle6 is the advisable choice.With increase of fracture toughness and the hardness of tools，the tool wear quantity is decreased.
Keywords:alumina ceramic cutting tools；tool wear；discrete element method simulation；attrition quantity