钛合金TB6铣削表面粗糙度与表面缺陷研究

摘要

Surface roughness of TB6 titanium alloy impacts its performance significantly.The effect on surface roughness and defects was studied through face milling parameters,dry milling and tool wear experiment.The results show that surface roughness for TB6 titanium alloy is mostly sensitive to the variation of feed per tooth,the next is the milling width,then is the depth of milling and the last is the milling speed.The value of VB have a significant influence on surface roughness,especially when VB is greater than 0.2mm,the roughness values increases significantly as well as bringing on some scratches and grooves.Feed mark,smeared and uplift material defects are observed on all machined surface samples.A large number of deposited material or pitting corrosion adhere to the worked surface during dry milling as well as burr formation increasing.Burr formation decreases with the increasing of milling speeds,while increases with the VB increasing.Wherefore,TB6 titanium alloy is suitable for low milling speed with cooling lubrication during milling.%钛合金TB6铣削表面粗糙度对其使用性能具有重要影响,通过试验研究端面铣削参数、干铣削和刀具磨损对表面粗糙度及表面缺陷的影响.研究表明:表面粗糙度对每齿进给量变化最为敏感,其次是铣削宽度,再次为铣削深度,铣削速度最小;刀具磨损量(VB)对粗糙度产生明显影响,尤其VB大于0.2mm时,表面粗糙度将急剧增加,并导致划痕、孔洞缺陷;不同铣削条件下均存刀痕、侧流、隆起等缺陷;干铣削时加工表面出现熔敷物或熔滴,并增大毛刺;毛刺随切削速度的增大而变小,随刀具磨损量VB的增加而变大.钛合金TB6适宜在冷却润滑条件下低速铣削加工.