In order to improve the processing efficiency of mechanical parts for non-special-shaped parts with large quantities and different structures,a low-cost,simple structure,accurate positioning and strong applica-bility automatic scrap removal fixture is designed with the loading and unloading manipulator of CNC machi-ning center.It includes the design of positioning device,clamping mechanism and scrap removal gas path.Through the analysis of milling force and clamping force,the versatility and feasibility of the fixture are im-proved under the premise of ensuring the positioning accuracy and stability.The three-dimensional model of the fixture was established by SolidWorks,and the gas-solid coupling of Fluent-EDEM was used to simulate the gas path and chip particles of three different structures,and the gas path section was optimized.According to the analysis of the airflow trace diagram,the outlet airflow velocity and the particle motion state of the ex-ternal flow field,the results show that the rectangular gas path with the gas collecting cavity has uniform out-let airflow velocity and stable airflow field,and the scrap removal efficiency reaches 99.35%within 0.5 s.The simulation results can provide a reference for the optimization design of pneumatic scrap removal fixture.
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