In this paper, the impact pressure of abrasives acting on the polished materials was
deduced by Field Theory and the model of surface roughness for polishing super hard materials
with Abrasive Water Jet (AWJ) was established. The model indicates that the surface roughness
increases linearly with an increase in the maximum depth of abrasives indenting into materials and
that the relationship between the surface roughness and polishing parameters including water
pressure, abrasive pressure, the impact angle, the hardness of the polished material, the elastic
distortion of abrasive, abrasive size, abrasive density, nozzle diameter and standoff.
The abrasive waterjet machining is a powerful tool in processing various materials, especially, for brittle materials, such as ceramic, glass and so on. However, the material removal of a brittle material when impacted by abrasive waterjet is not understood in detail. In this paper, the material removal model in fracture erosion of brittle materials by abrasive waterjet has been developed.
In this paper, the development process of BOPF technology was described, the tubular film stretching method and planar biaxial stretching method were compared, several types of one-step biaxial stretching equipment were introduced, and the prospect of the development of biaxial stretching was given.
Micro abrasive air jet (MAAJ) cutting is a promising technology for the fabrication of three-dimensional microstructures in hard and brittle materials. In this paper, a study on the cross-sectional shape of the kerf cut with MAAJ is presented. It shows that the machining depth and slope of the sidewall increase with an increase in air pressure, abrasive flow rate and jet incidence angle, while decrease with an increase in nozzle traverse speed. Using a dimensional analysis technique, predictive model for cross-sectional profile is developed. The research results may be meaningful to the highly precision three-dimensional micro-structural cutting.
This paper conducts a study on a precision micro abrasive waterjet (PMAWJ) machining system. A new kind of precision micro abrasive water jet system is designed and tapped. The flux and the flow velocity of the PMAWJ system are tested by experiments. Using the micromachining system, a group of polishing experiments is conducted for two kinds of hard-brittle materials such as silicate glass and silicon nitride. The results show the feasibility and the advantage of the PMAWJ machining system for polishing hard-brittle materials.
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