Great attention has been paid on fabricating diamond wire by using the brazing diamond because of its strong chemical bonding strength and controllability of grits distribution. Although several serving performances o...Great attention has been paid on fabricating diamond wire by using the brazing diamond because of its strong chemical bonding strength and controllability of grits distribution. Although several serving performances of brazed diamond wire have been reported, seldom do these studies refer to its process characteristics. Sawing performances of a brazed diamond wire are investigated and compared with those of a sintered diamond wire on a wire saw machine. The surface topographies of beads selected from the two wires are micro observed before sawing. The sawing tests are carried out in constant feed rate feeding（CFF） and constant normal force feeding（CNFF）. In CFF test, sawing force, power, and the cut depths of positions on contact curve are measured. Then, coupled with the observations of beads topographies, sawing force and its ratio, relations of power against material removal rate, and contact curve linearity are compared and discussed. In CNFF test, the sawing rates of the two wires are investigated. The results indicate that the brazed wire performs with lower sawing force（less 16% of tangential force and 28% of normal force）, more energy efficiency（nearly one-fifth of sawing power is saved）, at a higher sawing rate （the rate is doubled） and with better contact curve linearity as compared with the sintered wire. This proposed research experimentally evaluates the sawing performances of brazed diamond wire from the aspect of process parameters, which can provide a basis for popularizing the brazed diamond wire.展开更多
在分析锯切弧区内单颗磨粒切削深度与锯切参数及锯切弧区内切向力分布关系的基础上,依据能量转化原理建立基于弧区切向力分布的锯切功率消耗模型(Power on force distribution,PFD)。通过系列锯切试验测量不同锯切参数下的锯切功率消耗...在分析锯切弧区内单颗磨粒切削深度与锯切参数及锯切弧区内切向力分布关系的基础上,依据能量转化原理建立基于弧区切向力分布的锯切功率消耗模型(Power on force distribution,PFD)。通过系列锯切试验测量不同锯切参数下的锯切功率消耗,采用回归方法分析所建PFD模型的适用性及其影响因素,然后采用此模型进行锯切功率仿真预测,并比较锯切参数组合在不同样本抽取方式下的预测误差率差异,最后进行少样本预测的实例验证。试验结果表明,所建立的锯切功率消耗模型能很好地反映同一线速度下锯切功率与锯切参数之间的对应关系,这与同一线速度下锯切弧区内切向力基本服从同一种分布关系有关。锯切功率仿真预测及实例预测的结果表明,结合弱对角线抽样方式,采用所建模型可以实现锯切功率的少样本预测。展开更多
基金supported by National Natural Science Foundation of China(Grant Nos. 51235004, 51105148, 51175194)Program for Changjiang Scholars and Innovative Research Team in University of China(Grant No. IRT1063)
文摘Great attention has been paid on fabricating diamond wire by using the brazing diamond because of its strong chemical bonding strength and controllability of grits distribution. Although several serving performances of brazed diamond wire have been reported, seldom do these studies refer to its process characteristics. Sawing performances of a brazed diamond wire are investigated and compared with those of a sintered diamond wire on a wire saw machine. The surface topographies of beads selected from the two wires are micro observed before sawing. The sawing tests are carried out in constant feed rate feeding（CFF） and constant normal force feeding（CNFF）. In CFF test, sawing force, power, and the cut depths of positions on contact curve are measured. Then, coupled with the observations of beads topographies, sawing force and its ratio, relations of power against material removal rate, and contact curve linearity are compared and discussed. In CNFF test, the sawing rates of the two wires are investigated. The results indicate that the brazed wire performs with lower sawing force（less 16% of tangential force and 28% of normal force）, more energy efficiency（nearly one-fifth of sawing power is saved）, at a higher sawing rate （the rate is doubled） and with better contact curve linearity as compared with the sintered wire. This proposed research experimentally evaluates the sawing performances of brazed diamond wire from the aspect of process parameters, which can provide a basis for popularizing the brazed diamond wire.
文摘在分析锯切弧区内单颗磨粒切削深度与锯切参数及锯切弧区内切向力分布关系的基础上,依据能量转化原理建立基于弧区切向力分布的锯切功率消耗模型(Power on force distribution,PFD)。通过系列锯切试验测量不同锯切参数下的锯切功率消耗,采用回归方法分析所建PFD模型的适用性及其影响因素,然后采用此模型进行锯切功率仿真预测,并比较锯切参数组合在不同样本抽取方式下的预测误差率差异,最后进行少样本预测的实例验证。试验结果表明,所建立的锯切功率消耗模型能很好地反映同一线速度下锯切功率与锯切参数之间的对应关系,这与同一线速度下锯切弧区内切向力基本服从同一种分布关系有关。锯切功率仿真预测及实例预测的结果表明,结合弱对角线抽样方式,采用所建模型可以实现锯切功率的少样本预测。
