Interpolation of Toolpath by a Postprocessor for Increased Accuracy in Multi-axis Machining

The article focuses on the issue of generating points of the toolpath for multi-axis machining. In multi-axis machining, it is possible to control the toolpath using the coordinate transformations of tool center point (TCP) in the control system, or these transformations in the control system are not available and it is necessary to use the transformations in the postprocessor. However, without the use of TCP, the required toolpath tolerance is not respected. Therefore, an algorithm has been proposed in the postprocessor that dynamically generates new toolpath points so as to maintain the required tolerance and to ensure manufacturing accuracy. This algorithm has been verified by implementation in the postprocessor and generation of NC programs for machining of impeller blades. By the postprocessor recalculated tool path meets the required tolerance.