中文摘要：

车刀前刀面的微沟槽结构可以改善切削性能,但是,超硬的CBN车刀表面微加工极为困难.因此,提出采用微磨削技术在CBN前刀面加工出深度为54 μm的微沟槽结构,可实现钢的干切削.采用金属基的#600金刚石砂轮V形尖端沿着与切削刃成不同夹角方向在CBN车刀的前刀面上加工出微沟槽结构;通过升温试验分析前刀面温度与车刀尖端温度的相关性;对45钢进行干切削试验,研究微沟槽结构特征和切削条件对干切削温度的影响.结果表明,CBN车刀前刀面可被加工出规则和光滑的微沟槽结构.平行微沟槽结构和倾斜微沟槽结构比垂直微沟槽有更快的排热速度,可起到散热作用.前刀面的温度与车刀尖端的温度有极好的相关性,所以它可用于预测干切削的刀尖温度.可以证明,平行微沟槽结构车刀可以比传统平面车刀降低干切削温度约18％.但是,垂直和倾斜微沟槽结构车刀会产生更大的干切削温度,这是因为它们的微沟槽结构改变了切削刃的形状,造成刀具磨损.在较大切除率的干切削中,平行微沟槽结构CBN车刀能够更大幅度地降低刀尖的切削温度,造成非常小的刀具磨损.

英文摘要：

Micro-grooves on tool rake surface can improve cutting performance,but it is very difficult to perform a micro-machining towards superhard CBN cutter.Thus,a micro-grinding is proposed to fabricate 54 μm-height micro-grooves on CBN cutter rake surface for dry cutting of steel.A metal-bonded #600 diamond wheel V-tip is employed to fabricate micro-grooves along different orientations to cutting edge; heat-up experiments are performed to analyze the correlation between rake surface temperature and cutter tip temperature; dry cutting experiments of #45 steel are performed to investigate the effects of micro-groove orientations and cutting conditions on dry cutting temperature.It is shown that the regular and smooth micro-grooves on CBN cutter rake surface may be machined.Rake surface temperature may be used to predict cutter tip temperature because they are very relative.The parallel and diagonal micro-grooves on cutter rake surface produce quicker hear transfer,which can contribute to excluding cutting heat from cutter tip.It is confirmed that parallel micro-grooves on cutter rake surface may decrease dry cutting temperature by 18% compared with traditional plane cutter.However,diagonal and vertical micro-grooves produce the largest cutting temperature because the cutting edge shape due to micro-grooves is changed.In the case of large removal rate,parallel micro-grooved cutter produces much less cutter tip temperature than diagonal and vertical micro-grooved cutters,leading to much less cutter wear.