摘要
应用可视化数值模拟方法,借助于大型通用有限元软件ANSYS建立砂轮回转的数学模型,对离心应力进行了仿真研究.随着磨削速度的提高,磨粒的切削作用被磨粒对工件的高速冲击作用所取代.通过输入不同的转速对比,发现砂轮孔壁处所受切向应力σt最大,径向应力很小可忽略,而在砂轮外圆处切向应力较小.随转速提高,外圆切向应力增长趋势显著,破坏趋势也愈明显,因此切向应力是破坏的主要原因.这一虚拟分析既为砂轮实际应用中出现的破坏现象所佐证,又与砂轮受力分析结果相吻合,为磨削过程的安全奠定了良好的基础.
A simulation study was made of the centrifugal stresses exerted on a grinding wheel by means of a visual numerical simulation technique, using the FEM software ANSYS. It was found that with increasing the rotation speed, the conventional cutting function of the wheel abrasives was replaced by a high-speed impact one of them, and that a maximum tangential stress, and a negligible radial stress were generated on the wheel＇s opening surface, as well as a small tangential stress produced on the cylindrical surface of the wheel. The tangential stress on the cylindrical surface was markedly increased with increasing the rotation speed, thus leading to the fracture of the wheel. These theoretical calculations were in agreement with the stress analysis of the wheel, and confirmed by the appearance of the fracture surface as well, thus providing a safety insurance for the grinding process.
出处
《南方金属》
CAS
2007年第1期24-27,共4页
Southern Metals
