Abstract
In order to improve surface polishing quality and efficiency for hard and brittle components, a novel nozzle with specifically designed shroud was proposed for an abrasive jet polishing process. The removal mechanism of the abrasive jet under such a nozzle was investigated by simulating the jet flow in the interaction area of the nozzle shroud and workpiece. The simulation results show that the speed of the abrasive jet increases greatly by the shroud and the direction of the jet is aligned near parallel to the workpiece surface to minimize impact damage to workpiece surface. The constrained abrasive jet polishing (CAJP) experiments were conducted on the quartz glass component, a typical hard and brittle material, showing that the material removal mainly relied on the shearing and scratching of the workpiece surface rather than the mechanical shock impacts, which is consistent with the simulation findings.
Highlights
Ever increased challenges in the fields of energy, optics and medicine increased the use of hard and brittle materials, such as optical glass, optical crystals, and engineering ceramics, etc. to meet the requirement for the exaltation of optical resolution, the reduction of scattering loss, the enhancement of damage-resistance threshold, and the guarantee of a reliable performance in a critical precision application with higher quality demands in both geometrical accuracy and surface integrity [1]
In order to gain an insight of the constrained abrasive jet polishing (CAJP) process, the investigation focuses on the abrasive jet flow dynamic performance
It is noticed that the jet pressure near workpiece surface increased further when slit gap became narrower, which could be beneficial to material removal in CAJP
Summary
Ever increased challenges in the fields of energy, optics and medicine increased the use of hard and brittle materials, such as optical glass, optical crystals, and engineering ceramics, etc. to meet the requirement for the exaltation of optical resolution, the reduction of scattering loss, the enhancement of damage-resistance threshold, and the guarantee of a reliable performance in a critical precision application with higher quality demands in both geometrical accuracy and surface integrity [1]. The hardness of the magnetorheological fluid involved in polishing can be controlled by the magnetic field, and the material removal method is changed to the shearing effect of the abrasive flow tangential direction, with almost no subsurface damage, and the polishing efficiency is greatly improved compared with ion beam processing. By mixing a well-controlled amount of gas into the abrasive flow, a large processing depth removal from nanometres to micrometres was acquired Of these investigations, the negative effect of the divergence of jet beam and the normal impact were not mentioned. Magnetorheological jet polishing (MJP) is a combination of AJP and MRP [22] It uses low-viscosity magnetorheological fluid to generate magnetorheological effects under the action of an external magnetic field to form a collimated hardened jet beam to impact the surface of the workpiece [23]. Compared to AJP and MJP, CAJP gives minimum normal jet impact
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