大气压冷等离子体射流辅助微铣削纯钛试验研究

Experimental Research on Atmospheric Pressure Cold Plasma Jet Assisted Micro-milling Pure Titanium

纯钛具有良好的机械性能和较高的应用价值,但其塑性高、导热性差的特点导致切削加工时存在切削力较大、表面质量较差等问题。为提高金属零部件微铣削加工质量,一些辅助加工手段被提出,但未能改变材料特性、未能解决冷却介质浸润性差和材料塑性高的问题,且改善材料表面质量的效果有限。大气压冷等离子体射流可在短时间内将材料表面改性为超亲水状态且可降低材料强度、促进材料断裂,故提出将大气压冷等离子体射流引入纯钛材料的微铣削过程,并在研究冷等离子体射流辅助加工机理的基础上,于不同冷却润滑环境下开展微铣削纯钛试验。结果表明:冷等离子体射流通过改善冷却介质浸润性、促进材料断裂,可有效提高加工表面质量、缓解刀具磨损,从而显著改善纯钛的切削加工性能。

Pure titanium has good mechanical properties and high application value,however,the characteristics of high plasticity and poor thermal conductivity lead to the problems of high cutting force and poor surface quality.In order to improve the quality of micro-milling,some auxiliary machining methods have been proposed,but these methods have not changed the material characteristics,the poor wettability of cooling medium,high material plasticity and other problems have not been solved,resulting in limited improvement of the surface quality.The atmospheric pressure cold plasma jet can modify the surface of the material into a superhydrophilic state in a short time,and reduce the strength of the material to promote material fracture.In this paper,the atmospheric pressure cold plasma jet is introduced into the micro-milling process of pure titanium.Based on the study of the mechanism of cold plasma jet assisted machining,the micro-milling experiments of pure titanium were carried out in different cooling and lubricating environments.The experimental results show that the cold plasma jet can effectively improve the machining surface quality and alleviate the tool wear by improving the wettability of the cooling medium and promoting the material fracture,thus significantly improving the machining performance of pure titanium.