空气喷射辅助少量润滑对航空铝合金7050-T7451铣削力的影响

Effect of Air Jet Assisted Little Quantity Lubrication on Cutting Force in Aviation Aluminum 7050-T7451 Milling Process

为了提高少量润滑的冷却润滑效果,提出了空气喷射辅助少量润滑的方法,并利用建立的空气喷射辅助少量润滑系统对航空铝合金7050-T7451进行铣削实验。通过采集切削力信号对干切削、不同切削液流量的空气喷射辅助少量润滑切削和湿式切削进行比较研究。结果表明:干切削条件下的切削力大于空气喷射辅助少量润滑的切削力,且随着切削液流量的增大,气液两相冷却润滑介质的润滑能力增强,导致切削力呈减小趋势;空气喷射辅助少量润滑与湿式冷却润滑两种条件下的切削力相比,总体来说前者小于后者,这一现象表明空气喷射辅助少量润滑的润滑效果优于湿式冷却润滑,但切削液的使用量仅为后者的3%。

In order to improve cooling and lubrication effect of little quantity lubrication,air jet assisted little quantity lubrication(AJLQL)was put forward and milling experiment of aviation aluminum alloy 7050-T7451 was carried out by using AJLQL system.A comparative study of dry cutting,AJLQL cutting and flood lubrication cutting was conducted based on cutting force signals.The results show that the cutting force under dry cutting condition is larger than that of AJLQL cutting.With the increase of cutting fluid flow rate,the lubricating ability of air-liquid two phase cooling-lubrication medium increases,which results in the decrease of cutting force.Comparison of cutting force between AJLQL cutting and flood lubrication cutting shows that the cutting force of AJLQL cutting is smaller than that of flood lubrication cutting,which indicates that the lubrication effect of AJLQL is better than that of flood lubrication,but the cutting fluid usage is only 3%of the latter.