Air-driving fluid jet polishing (FJP) technique was first presented in 2011. Slurry was drop out due to Venturi effect inside the atomizer which is the main component of air-driving FJP system, and was guided to mix with air flow by the nozzle. The Venturi effect and the added high speed air flow provide slurry more kinetic energy to impact the optical surface. Therefore, the air-driving FJP system has a rotational symmetrical Gaussian-like removal profile with lower air pressure and normal incidence configuration. In this paper, we investigate oblique incidence polishing to find the optimal material removal performance of the technique, including removal shape and depth and surface roughness. Different oblique angles ranged from 80 to 20 degree were tested. The air-driving FJP system was adapted upon a CNC machine, so not only single point polishing but also straight line polishing with constant feed rate can be carried out. We report on the performance of oblique air-driving FJP in different air pressure and processing time, and also the material removal of dynamic polishing for N-BK7, Fused Silica and ZERODUR®. The results indicate oblique incidence can get a Gaussian-like removal shape, and improve the surface roughness. The air-driving FJP not only has the advantages of conventional fluid jet polishing, such as no tool wears, cutter interference and debris deposition problems, but also has excellent material removal rate with lower energy.
Due to the volumetric shrinkage of the resin and the induced residual stress during the curing process, the
reflection on the gel-coating layer surface will be imperfect if twists and wrinkles exist on the gel-coating surface. This
phenomenon is denoted as print-through phenomenon (PTP). Currently, the detection of PTP for most of the yacht
industry using the composite materials is performed mainly by visual inspection, and its quality is needed to be
quantified to determine their grades. Therefore, there is a need to develop a lightweight portable optical measurement
system that can be applied quickly to inspect different levels of PTP for the fiber-reinforced plastics (FRP) of the yacht
body. The measurement system was developed based on the scattering principle of a reflected laser fringe projected on
to the workpiece surface. Two indexes, namely the profile peak-valley height and wave-height of the Fast-Fourier
Transform based on the centerline of the extracted image profile, were proposed to quantify the PTP of a test specimen.
The mean line width of the extracted image was applied to evaluate the surface roughness of the test specimen, based on
the scattering theorem. A set of software programmed with Borland C++ Builder language was developed to calculate
the proposed indexes and the mean line width. The developed measurement system has been taken to some yacht
factories to do the on-site measurements. The measurement results were, in general, consistent with the surface
conditions of the polished surfaces.
This study developed an intermittent process measurement system by integrating a MP700 touch trigger probe system with a machining center to measure a workpiece containing freeform surface and regular geometric features, and to do the statistical process control analysis. The whole measuring system, consisting of a personal computer, a CNC machining center controller, a RENISHAW MP700 touch probe system, was integrated information-technically. Measuring software was also developed to simulate the measuring path, to prevent collision, to generate the corresponding measuring NC codes and to calculate the process capability indices, such as the process capability index (Cp), the process performance index (CPK) and the accuracy capability index (Ca). To evaluate the performance of the developed measuring system, a carrier combined with a freeform surface and regular geometric features, referred to in the ISO 10791-7 cutting test standard, was designed. Six pieces of the tested carriers were manufactured and inspected using the MP700 touch trigger probe to evaluate the performance of the developed measuring system. According to the measuring results, the developed measuring system was successfully and effectively used to carry out the intermittent process measurement and the statistical process analysis of the measuring results of some test carriers on the machining center.
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