大长径比微铣刀微细铣削Ti6Al4V钛合金试验研究
2018-09-21
作者：闫继豪，赵国龙，李亮，何宁，王茂
单位：南京航空航天大学
摘要：高深宽比微结构的微细铣削加工需要使用大长径比的微铣刀，而大长径比的微铣刀刚度差，根部易折断，必须以较小的铣削参数进行加工。本文使用长径比为5的硬质合金微铣刀进行微细铣削钛合金的试验，主要研究了铣削参数对铣削力、已加工表面粗糙度和顶端毛刺宽度的影响。结果表明，在给定的每齿进给量和铣削深度范围内，三向铣削力随着每齿进给量和铣削深度的增大而增大；表面粗糙度Sa随着每齿进给量的增大呈先减小后增大的趋势，但随着铣削深度的增大没有呈现明显规律；顶端毛刺宽度随着每齿进给量的增大呈减小趋势，在较小的每齿进给量下，顶端毛刺宽度随着铣削深度的增大而显著减小，在较大的每齿进给量下，铣削深度对顶端毛刺宽度的影响较小。
关键词：微细铣削；Ti6Al4V钛合金；大长径比微铣刀；表面粗糙度；顶端毛刺宽度
中图分类号：TG713；TH161文献标志码：A
Experimental Study on Micro Milling of Ti6Al4V Titanium Alloy
with High Aspect Ratio Micro Tool
Yan Jihao，Zhao Guolong，Li Liang，He Ning，Wang Mao
Abstract:Micro tool with high aspect ratio is needed in micro milling of high aspect ratio micro structure.However，micro milling tool with high aspect ratio has poor stiffness，which results in its breakage easily.Thus smaller milling parameters are favorable.In this paper，an experimental study on micro milling of titanium alloy with carbide micro tool with an aspect ratio of 5 is carried out.The effects of milling parameters on milling force，machined surface roughness and top burrwidthare investigated.The results show thatwith increasing of feed per tooth and milling depth，the milling force increases gradually.With increasing of feed per tooth，the surface roughness decreases firstly and increases subsequently.However，milling depth has no obvious influence on the surface roughness.With increasing of feed per tooth，the width of top burr decreases.When using low feed per tooth，the width of top burr decreases with increasing of the milling depth.However，when using high feed per tooth，the milling depth has no obvious influence on the width of top burr.
Keywords:micro milling；Ti6Al4V；high aspect ratiomicro tool；surface roughness；top burr width