Material removal stability of fixed abrasive tool polishing based on line scanning

Maintaining the stability of material removal function has important implications for deterministic material removal processing. In this paper, the stability of material removal function for fixed abrasive tool polishing TC4 titanium alloy was studied by line scanning based on the polishing platform with the force-position hybrid control. The concept of curve similarity was introduced, and relative peak variation and average profile variation were proposed to quantify the change of material removal profile over time in fixed abrasive tool during the polishing process. Furthermore, material removal simulation model of line scanning was established. The influence rule of elastic layer material properties of fixed abrasive tool on profile of material removal and polishing stability was obtained. The experiment results indicated that the differences between the simulation material removal profile and the experiment results are small, as the hardness of the elastic layer of fixed abrasive tool increases, the width of the material removal profile decreases and the maximum removal depth increases. The relative peak variation and the average profile variation of fixed abrasive tool for elastic layer with Shore hardness of 50A are 0.125 ~ 0.176 and 0.253 ~ 0.326, respectively. The change range of material removal profile variation is small, and the similarity of the profile curve is high. The polishing stability evaluation index based on curve similarity can effectively quantify the time-varying nature of material removal profile of fixed abrasive tool, which provides a new evaluation index for the design and optimization of fixed abrasive tool for grinding and polishing.