摘要
刀屑接触界面的温度分布尤其是刀具最高切削温度对刀具磨损研究至关重要,而相对稳定的温度场是获得客观可靠模拟结果的必要前提,但在切削仿真过程中稳定温度场的获取存在周期长、不稳定等难题。针对上述问题,文章基于切削仿真平台,探寻硬质合金涂层车刀切削过程刀具温度场达到相对稳态时的传热学条件。采用修正的拉格朗日算法和局部网格重划分技术对该切削过程进行有限元仿真,重点关注并揭示刀具与工件间的总传热系数和刀具与周围环境间的对流换热系数对切削仿真温度分布的影响规律,从而获得给定切削条件下的优选方案。研究发现,当刀具与工件间传热系数取为1500k W/(m2·k),刀屑界面与周围环境的对流换热系数取为15k W/(m2·k)时,"刀具-工件-空气"三者可迅速达到基本热平衡状态,并获得相对稳定的刀具温度场。
The temperature distribution of tool-chip contact interface,especially the maximum cutting temperature of a tool,is very important for tool wear research. Relatively stable temperature field is a prerequisite for obtaining objective and reliable simulation results. However,difficult problems such as long cycle and instability exist in the acquisition of stable temperature field in the process of cutting simulation.Aim at the problems above,based on the cutting simulation platform,this paper explores the optimum heat transfer conditions when the tool temperature field reaches the relatively steady state in the cutting process of cemented carbide coated turning tool. Modified Lagrange algorithm and local remeshing technique are used to simulate the cutting process by FEM. The influence of the total heat transfer coefficient between the tool and workpiece and the convection heat transfer coefficient between the tool and the surrounding environment on the temperature distribution of the cutting simulation is focused on and revealed,so as to get a preferred plan under given cutting conditions. It is found from the research that when the heat transfer coefficient between the tool and the workpiece is taken as 1500,and the convection heat transfer coefficient between tool-chip interface and surrounding environment is taken as 15,the system ＂ tool-workpiece-air＂ can quickly reach the basic thermal equilibrium,and a relatively stable tool temperature field is obtained.
作者
蒋宏婉
任仲伟
袁森
陈海虹
邵芳
JIANG Hong-wan;REN Zhong-wei;YUAN Sen;CHEN Hai-hong;SHAO Fang(College of Mechanical Engineering,Guizhou Institute of Technology,Guiyang 550003,China;College of Mechanical Engineering,Guizhou University,Guiyang 550025,China)
出处
《组合机床与自动化加工技术》
北大核心
2018年第8期50-52,56,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
国家自然科学基金(51765009
51465009)
关键词
硬质合金
稳定温度场
热平衡
cemented carbide
stable temperature field
thermal equilibrium
