研究目的
Investigating the feasibility of dressing wheels using laser beam and predicting the geometry of crater formed by a single-pulse laser ablation on resin bonded superabrasive wheels.
研究成果
The model developed can predict the geometry of crater formed by a single-pulse laser ablation on resin bonded superabrasive grinding wheels. The predicted results are validated with the published results, showing deviations at higher intensity ranges. The model provides insights into the process mechanism of laser dressing and the parameters affecting the crater geometry.
研究不足
The model does not consider the dynamics of molten phase during single-pulse laser ablation, the effect of plasma shielding, and the cooling effect due to co-axial or inert gas used in laser ablation. The temperature dependence of the property of resin bond such as thermal conductivity and specific heat at constant pressure is also neglected.
1：Experimental Design and Method Selection:
A three-dimensional transient heat transfer model was developed to predict the 3D geometry of crater on grinding wheel surface ablated by a single pulsed Nd: YAG laser. The model considers the heterogeneity of wheel structure and the variation of energy in a pulsed laser input to the wheel.
2：Sample Selection and Data Sources:
Resin bonded CBN and diamond wheels were chosen based on specifications like grit number, structure number, and grade number.
3：List of Experimental Equipment and Materials:
COMSOL Multiphysics?
4：2 package was used for modeling. Experimental Procedures and Operational Workflow:
The geometric model of the wheel was developed and imported into COMSOL for thermal modeling. The temperature distribution in the wheel was obtained by applying boundary conditions and refining the mesh.
5：Data Analysis Methods:
The mesh elements with temperature higher than the ablation temperature of grits and bond were removed to obtain the geometry of crater.
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