摘要
文章建立了Ti6Al4V高速微铣削过程中毛刺形成的有限元模型。由于毛刺出现在逆铣削过程中微铣刀切出工件处的数量远远大于其他位置的出现数量。因此,建立了逆铣削微铣刀切出处的有限元模型,毛刺变形方面采用JC本构模型,并通过实验对所提出的模型进行验证。实验结果表明,仿真获得的毛刺高度和宽度与实验验证值之间的最大误差为15%。为验证切削速度是影响毛刺形成的主要因素,针对切削速度对毛刺尺寸的影响进行了进一步的分析。仿真结果表明,若刀具转速由1000rpm增加到20000rpm时,毛刺尺寸(高度和宽度)相应减少96%。因此,在Ti6Al4V高速微铣削过程中,切削速度是影响毛刺尺寸的最主要因素。另外,通过该模型可以实现减少微细加工中微细零件的毛刺数量或抑制毛刺的形成。
This article is established the finite element model of burr formation in high-speed micro-milling of Ti6Al4V.Due to the burr produced at the up milling side at the exit of the micro-milling tool is the biggest among burrs at other locations.Therefore,side exit burr at the up milling side has been modeled through finite element modeling.Johnson cook material constitutive model and experimental test has been implemented in the formulation of burr formation and in the validation of developed model.It is found that the burr height and width obtained from the simulation has been validated experimentally with a maximum error of 15%.In order to verify the cutting speed is the main factor affecting burr formation,the model has been further extended to study the effect of cutting speed on the burr size.The simulation shown that,the burr size was reduced by 96%(both height and width)if cutting tool speed was increased from 10,000 to 200,000 rpm.Therefore,it is concluded that the cutting speed is the major factor to reduce the burr size in micro-milling of Ti6Al4V.And the high speed micromachining center can be helpful in producing the micro parts with less or no burrs.
作者
李文杰
LI Wen-jie(School of Aeronautical Materials Engineering,Xi′an Aviation Professional Technology Institute,Xi′an 710089,China)
出处
《组合机床与自动化加工技术》
北大核心
2018年第10期126-128,133,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
陕西省教育厅科研计划项目资助(16JK1399)
关键词
高速微铣削
仿真
毛刺
high-speed micro-milling
simulation
burr
