Tracing Algorithm of Workpiece Heat Flux in Deep Hole Processing

The surface damage and deformation of drilling hole caused by cutting thermal have an important influence on the hole quality in deep hole processing. Based on the characteristics of deep hole drilling, a novel method is developed to trace the spatial and temporal distribution of workpiece temperature relying on less heat flux information. Combining the producing mechanism of drilling thermal with the repartition and decoupling of heat source segment, the average heat fluxes are calculated by means of sequential function specification method(SFSM), and meantime, these results are introduced into the solving iterative process of transient heat flux. Consequently, the heat flux distribution regulations of drilling tool, including the cutter tooth profile and burnishing pads, and the spatial and temporal distribution of workpiece temperature during drilling process are calculated simultaneously and compatible accuracy is obtained without increase of computational cost. Then, a series of experimental investigations are carried out to confirm the feasible and effective of the aforementioned algorithm. The relevant experimental results indicate that this method proposed will be able to be a possibility of monitoring continuously the tool wear and workpiece heat distortion in deep hole drilling process.