This paper  introduces a study on modeling of  the wear of composite carbide nozzles  in Abrasive Waterjet (AWJ) cutting. The model was built based on many long-term wear test data. In the model,  the  effects  of  jet-parameters  such  as water  pressure,  abrasive mass  flow  rate,  orifice diameter,  and  initial  nozzle  diameter  were  taken  into  account.  The  model  can  be  used  for calculation  the  nozzle  lifetime  and  therefore  used  for  programming  the  AWJ  cost  optimization problem. Through  the  analyzing  of  the model,  the  effects  of  above  parameters  on  the  composite carbide nozzle wear were also more understood.

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