Design and Processing Research of Dynamic Pressure Assisted Non-Newtonian Fluid Polishing Tools.

To overcome the problems of low and uneven material removal rate when polishing with NNFL, the design and processing research of dynamic pressure assisted non-Newtonian fluid polishing tools(DNNFTs) were carried out. The DNNFT was designed by adding the pressure-controllable center-int to form a dynamic pressure film. The mechanics properties of the filling material Silly-putty were analyzed, numerical simulation of NNFL fixed point polishing was carried out. The influences of liquid supply pressure on the dynamic pressure field, total pressure field and velocity field of liquid film in the processing area of DNNFT were analyzed based on FLUENT. The material removal function models were constructed based on Preston material removal principle. The polishing process experiments were carried out on 304 stainless steel workpieces. It is concluded that the material removal rate and uniformity may be effectively improved by adding the pressure-controllable center-int. The smallest value of surface roughness (Ra = 19 nm) and the best material removal rate(2.431 mg/min) are obtained when the liquid pressure is as 0.8 MPa, the rotational speed is as 1200 r/min and the feed rate is as 6 mm/s. The results prove that DNNFT effectively improves the quality and efficiency of polishing, and improves the uniformity of material removal. [ABSTRACT FROM AUTHOR]