冷却润滑方式对CFRP/钛合金叠层制孔刀具磨损的影响

Effect of Cooling Strategies on Tool Wear of Drilling CFRP/TC4 Stacks

碳纤维增强树脂基复合材料(Carbon fiber reinforced polymer,CFRP)和钛合金组成的叠层结构由于其优良的机械性能在航空航天领域得到了广泛的应用。为了延长刀具寿命,本文在CFRP/钛合金叠层低频振动钻削试验中采用中心吹气、微量润滑技术(Minimum quantity lubrication,MQL)、水基冷却液和液氮冷却方法,研究冷却润滑方式对钻削温度、轴向力与刀具磨损的影响。试验结果表明,使用中心吹气时加工温度最高,使用液氮时加工温度最低,液氮冷却时轴向力最大,而使用水基冷却液时轴向力最小。水基冷却液对延长刀具寿命的效果最好,达到了66个孔,而液氮冷却时最差,只有12个孔。刀具主要的磨损形式为粘结磨损和磨粒磨损。

Stack materials composed of carbon fiber reinforced polymer(CFRP)and titanium alloys are widely used in the aerospace field due to their excellent mechanical properties.In order to prolong the tool life,this paper adopted the center blowing,MQL(Minimum quantity lubrication),water-based coolant and liquid nitrogen cooling methods in the lowfrequency vibration assisted drilling experiment of CFRP/titanium alloy stacks to study the effects of these four cooling and lubrication methods on drilling temperature,axial force and tool wear.The results show that the machining temperature is the highest when center blowing is used,and temperature is the lowest when using liquid nitrogen;The thrust force is the largest when using liquid nitrogen,and is the smallest when water-based coolant is used;The tool life is the longest when using water-based coolant,reaching 66 holes,and the worst when using liquid nitrogen cooling,only 12 holes.The main forms of tool wear are adhesion wear and abrasive wear.