Simulation and experiment of cutting characteristics for single cBN-WC-10Co fiber
Simulation and experiment of cutting characteristics for single cBN-WC-10Co fiber
复制标题
单根cBN-WC-10Co纤维切割特性模拟与实验
DOI：
10.1016/j.precisioneng.2017.12.001
复制
发表时间：
2018-04-01
影响因子：
3.6
通讯作者：
Bi, Zhuming
中科院分区：
文献类型：
--
作者：
Mao, Cong;Lu, Ji;Bi, Zhuming
为了探索单根纤维的切削特性，模拟了单根cBN WC 10 Co纤维对Ti 6A 1 4 V钛合金的切削过程，纤维尺寸为6 mm长、0.8 mm × 0.8 mm横截面。采用Johnson-Cook本构方程建立了Ti-6A 1 - 4V钛合金的材料模型。将最小热阻法与比有效热导率法相结合，得到了cBN-WC-10 Co复合材料的热导率。为评价cBN WC 10 Co单根纤维的磨削性能，采用对比实验和数值模拟相结合的方法进行了研究。模拟结果预测了工件的变形和切削温度，以及单根纤维的切削力和磨损深度。为对比单纤维和单锥形磨粒刀具对Ti-6A 1 - 4V钛合金的切削性能，进行了单纤维和单锥形磨粒刀具的切削试验。结果表明，在相同工艺条件下，单纤维的切削温度比单颗粒的切削温度低50-100 ℃，磨损深度减少7%~ 1 - 5%，切削力增加1-5 N。单纤维的切削力比远小于单颗粒的切削力比。对比实验的结果与模拟结果一致，单纤维更容易形成切屑，而单颗粒切割的工件发生更多的塑性变形。这表明cBN-WC-10 Co纤维与CBN颗粒相比大大提高了材料去除性能。
To explore the cutting characteristics of single fiber, the cutting process of Ti-6A1-4 V titanium alloy by single cBN-WC-10Co fiber was simulated, and the fiber size was given as 6 mm in length and 0.8 mm x 0.8 mm in cross-section. The geometry of single fiber was modeled and the material model of Ti-6A1-4 V titanium alloy was established using the Johnson-Cook constitutive equation. The minimal thermal resistance method was combined with the specific effective thermal conductivity method to obtain the thermal conductivity of cBN-WC-10Co composites. To evaluate the grinding performance of single cBN-WC-10Co fiber, both of the comparative experiment and simulation were conducted. The simulation was used to predict the deformation and cutting temperature occurring to the workpiece, as well as the cutting force and the wear depth occurring to the single fiber. The cutting experiments were conducted on Ti-6A1-4 V titanium alloy by both of grinding tools with single fiber and single conical grain for the comparison. It was found that the cutting temperatures of single fiber were 50-100 degrees C lower, the wear depths were 7%-15% less, and the cutting forces were 1-5 N larger than those of single grain at the same process parameters. The cutting force ratios of single fiber were much less than those of single grain. The results from the comparative experiment were aligned with the simulation results that single fiber was able to develop chips easily, while more plastic deformation occurred on the workpiece cut by single grain. This indicated that the cBN-WC-10Co fiber improved the material removal performance greatly in comparison with the CBN grain.