Modeling the Thread Chasing Process for Improved Product Quality

A simulation model for the thread chasing process, an operation widely used to produce pipe threads, is described. This model focuses on the prediction of the cutting force system, and is based on sub-models for the process geometry, tool-work contact area (chip load), chip load-force relationship, and the structural response of the machining system when acted on by the cutting forces. The model is shown to be capable of predicting the cutting torque, cutting forces, and displacement present in the process. Experimental data obtained from a turning process is used to condition the model to the material of interest. The process model is then verified through physical experiments conducted with the thread chasing process. Discussion is presented on how the model may best be put to use for enhancing the quality of the thread chasing process and its associated products.