Abstract
Fluid jet polishing (FJP) is a versatile polishing process that has many advantages compared to other polishing processes. Stand-off distance (SOD) is one of the key parameters in fluid jet polishing. However, relatively little research work has been carried out to investigate its effect of SOD on material removal characteristics and surface generation in FJP. In this paper, a systematic investigation of the effect of SOD on the tool influence function and surface topography in FJP was conducted. Experiments were designed for FJP two kinds of materials corresponding to ductile and brittle materials. They are nickel copper (NiCu) alloy and BK7 optical glass, respectively. In this study, the SOD was varied from 2 to 35 mm. Analysis and discussions were made on its effect on the shape of TIF, material removal rate, and surface topography. It is interesting to note that the TIF shape becomes a Gaussian-like shape with large SOD both on NiCu and BK7, which provides a novel way to optimize the TIF in FJP. The variation of the material removal rate and surface roughness versus SOD on NiCu and BK7 were also determined from the experimental results. Moreover, the surface topography of NiCu and BK7 were characterized from the results measured from the white light interferometer and scan electron microscope. The outcome of the study provides a better understanding of the material removal characteristics and surface generation mechanism in FJP.
Highlights
Fluid jet polishing (FJP) [1, 2] is a versatile polishing process, which is a kind of working mode of the abrasive water jet machining process [3,4,5] with a working fluid pressure of less than 20 bar [6]
The following conclusions were made according to the experimental results: 1. The shape of the tool influence function can become Gaussian-like shape from a ring shape with increasing stand-off distance (SOD) on both ductile and brittle materials
The suitable SOD in FJP is found to be different in polishing of ductile and brittle materials based on the analysis of material removal rate and surface topography
Summary
Fluid jet polishing (FJP) [1, 2] is a versatile polishing process, which is a kind of working mode of the abrasive water jet machining process [3,4,5] with a working fluid pressure of less than 20 bar [6]. The multi-jet polishing process was utilized for the fast fabrication of structure array surfaces [25] They built a three-dimensional universal tool influence function model for FJP, which is able to be used for modeling of vertical impinging mode and oblique impinging mode of FJP [26]. The investigation will focus on the material removal rate and surface generation and pay attention to the effect on the shape of TIF and polished surface topography. It will provide a deeper understanding on the material removal characteristics in fluid jet polishing
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