Curvature effect induced cutting stress field offset and its influence on the damage of hard and brittle materials

Although many studies on the initiation of glass cracks under contact loads were carried out, specific problems arising under complex machining conditions remain poorly understood. In order to clarify the influence of particle trajectory curvature change on material grinding mechanism, a theoretical model of trochoid curvature radius was established, and the main factors affecting trochoid curvature were identified (moving circle radius R, spindle speed n and feed speed vw). Different curvature trochoid scratches were obtained by the experiment of trochoid feed scratches on quartz glass. The experimental results show that the scratch damage of the maximum curvature segment is larger than that of the minimum curvature segment. With the increase of trochoid curvature, material damage inside the scratch is more significant than outside. In order to further explain the distribution characteristics of trochoid scratches. Numerical simulation and theoretical analysis were used to verify the relationship between damage difference and curvature on both sides of the trochoid feed scratch groove. The curvature effect of trochoid feed scratch damage is proposed for the first time, which is used to explain stress field migration and damage distribution caused by trochoid curvature characteristics. This study further supplements and clarifies the removal mechanism of hard and brittle materials, which has theoretical guiding significance for quartz glass high-efficiency and controllable precision grinding.