摘要
工程陶瓷材料具有硬度大、强度高及脆性大等特点,采用Si_(3)N_(4)工程陶瓷进行车削正交试验,研究了材料的表面形貌、裂纹的扩展机理以及各切削参数对切削温度和切削力的影响,观测了刀具的磨损和切屑的形态。研究表明,切削参数对切削温度的影响主次顺序为进给量>切削深度>切削速度;切削参数对切削力的影响主次顺序为进给量>切削深度>切削速度。其中,进给量对切削温度和切削速度的影响最大,切削温度和切削速度均随着进给量的增加而增加,在选择切削参数时应优先选取进给量小的参数。陶瓷材料的硬脆特性使其在加工时容易在表面产生细小裂纹,同时硬度大的特性会造成加工刀具的严重磨损,导致刀具寿命偏低。相比于金属材料的塑性去除,Si_(3)N_(4)陶瓷去除方式为粉末性去除和脆性去除。
Engineering ceramic materials are characterized by high hardness,high strength and high brittleness.In this paper,Si_(3)N_(4)engineering ceramic turning orthogonal test is adopted.The surface morphology,crack propagation mechanism and the effects of cutting parameters on cutting temperature and cutting force are studied.The tool wear and chip morphology are also observed.The studies show that the main and secondary influences of cutting parameters on cutting temperature are as follows:feed rate>cutting depth>cutting speed.The main and secondary influences of cutting parameters on cutting force are as follows:feed rate>cutting depth>cutting speed.The feed rate has the greatest influence on cutting temperature and cutting speed.Both cutting temperature and cutting speed increase with the increase of feed,so when choosing cutting parameters,it is necessary to preferentially select parameters with small feed quantity for related processing.The hard and brittle properties of ceramic materials make it easy to produce small cracks on the surface during machining,at the same time,its high hardness will cause serious wear of machining tools,resulting in low tool life.Compared with the plastic removal of metal materials,the removal methods of Si_(3)N_(4)ceramics are powder removal and brittle removal.
作者
王明海
李雅楠
孔宪俊
Wang Minghai;Li Yanan;Kong Xianjun(不详;School of Mechatronics Engineering,Shenyang Aerospace University,Shenyang 110136,China)
出处
《工具技术》
北大核心
2023年第12期27-32,共6页
Tool Engineering
