Abstract
Experiments of internal thread grinding and flat groove grinding show that grinding efficiency and quality can be significantly improved by increasing the wheel speed. According to the characteristics of internal thread grinding and flat groove grinding, the grinding force measurement experiment is designed. The equivalent substitution method is used to compare with the Grinding Force per Unit Area in surface grinding test under the same conditions. The experimental results show that the measurement error of Grinding Force per Unit Area is less than 25 %.
Highlights
The results show that the surface quality of a workpiece can be effectively improved by increasing the linear speed of the grinding wheel
The difficulty of measuring the grinding force of internal threads is that after the lead of the internal thread is determined, the workpiece needs to keep rotating with respect to the machine tool at a certain angular speed, which will greatly interfere with the normal force and tangential force
The contact area between the grinding wheel and the workpiece is very small in internal thread grinding and flat groove grinding, which leads to the decrease of grinding force amplitude, which makes it difficult to distinguish the interference amplitude caused by machine tool vibration, grinding fluid impact and other factors, and reduces the signal-to-noise ratio
Summary
The results show that the surface quality of a workpiece can be effectively improved by increasing the linear speed of the grinding wheel. The contact area between the grinding wheel and the workpiece is very small in internal thread grinding and flat groove grinding, which leads to the decrease of grinding force amplitude, which makes it difficult to distinguish the interference amplitude caused by machine tool vibration, grinding fluid impact and other factors, and reduces the signal-to-noise ratio. All these factors reduce the accuracy of the grinding force measurement. The instantaneous contact area and the equivalent radius of grinding wheel for surface grinding by internal thread grinding, external thread grinding, and flat groove grinding are calculated respectively, and the Grinding Force per Unit Area is calculated on the basis of these models
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