PCBN刀具断续干式切削ADI时切削力与寿命的研究

Research on cutting force and tool life during interrupted dry-cutting ADI using PCBN tools

选用DBW85、DBC50、BN250、BN700四种牌号的PCBN复合片刀具断续干式车削等温淬火球墨铸铁(ADI),测定了在相同几何参数下的切削力和在不同速度下的刀具寿命。试验结果表明:(1)在所选用四种牌号PCBN刀具中,高CBN含量的BN700和DBW85断续加工ADI的性能,要优于低CBN含量的BN250和DBC50,其中DBW85性能最好。(2)高CBN含量的BN700和DBW85加工ADI时,切削速度可选择偏高一些,一般要大于130m/min,低CBN含量PCBN刀具加工ADI时,切削速度要选择偏低一些,在100m/min左右。(3)黏结剂中添加W元素可以有效抑制PCBN刀具切削ADI时的化学磨损,改善刀具韧性,有利于ADI的断续切削。

Four kinds of polycrystalline cubic boron nitride （PCBN） compact cutting tools （DBW85, DBC50, BN250,BN700） were used in the test of interrupted dry-cutting austempered ductile iron （ADI）. The cutting forces under the same geometrical parameters and tool life at different cutting speeds were measured. The results show that ： （ 1 ） Among the four kinds of PCBN cutting tools, the two kinds of high CBN content tools （ BN700, DBW85） have better performance than others（ BN250, DBC50）, the cutting ability of DBW85 is the best. （2） With high CBN content PCBN cutting tools （BN700, DBW85） in cutting ADI , their cutting speed should be higher, usually above 130 m/min; while with low CBN content PCBN cutting tools, their cutting speed should be lower ,usually about 100 m/min. （3） Adding element Win binder of PCBN tools is favorable for interruptedcutting of ADI, because it could reduce the chemical wear and improve the toughness of PCBN tools.