Proceedings of the International Conference on Advanced Manufacturing Technology
نویسندگان
چکیده
A transient two-dimensional model is developed and numericaUy solved to specifically investigate the effects of CNC motion and workpiece boundary on cutting front mobility and temperature in reactive-gas assisted C01 laser cutting. Co-ordinated motion systems must ramp up and down to their desired speeds, and therefore the initial actuator acceleration is considered for its effect on the cutting front phenomena. Boundary encroachment and bulk heating effects due to the workpiece boundary are also studied for their effect on the phenomena. Final actuator deceleration to workpiece edges reduces the amount of beam coupling arriving to the material and thus reduces such bulk heating effects. The results show that appropriate part programming of the laser system can help minimise the effect of boundary and motion on quality degradation. A more realistic temperature distribution of the workpiece was also obtained from the model by explicitly considering the presence of the kerf and making nodal points within it part of the convective environment. Results on front mobility and temperature show similar trends as experimental results elsewhere whilst their direct verification is currently under investigation.
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