Trends in the Development of Machinery and Associated Technology ” TMT 2008 , Istanbul , Turkey , 26-30 August , 2008 INFLUENCE OF FOCUSING TUBE WEAR ON THE CUT-SURFACE
The wear of the focusing tube is a very important feature of the abrasive water jet machining. Of all rejected focusing tubes, 85% are worn. Similary, the age of focusing tube influences the cut geometry and quality of machined surface. With regard to the stated, wearing of the focusing tube is subject of this paper. Focusing tube outlet diameter was measured as well as its influence on the surface quality.
Material removal in abrasive waterjet machining of metals Surface integrity and texture
An experimental study was conducted to determine the influence of material properties on the surface integrity and texture that results from abrasive waterjet (AWJ) machining of metals. A microstructure analysis, microhardness measurements, and profilometry were used in determining the depth of plastic deformation and surface texture that result from material removal. Models now available for dry abrasive erosion were adopted and found useful in understanding the influence of material properties on the hydrodynamic erosion process. It was found that the depth of subsurface plastic deformation is inversely proportional to a metals strength coefficient and extends the greatest depth near jet entry in the initial damage region (IDR). Furthermore, surface skewness in AWJ machining of metals increases with ductility and the corresponding critical strain for lip formation.
Room temperature erosion behaviour of 304, 316 and 410 stainless steels
Abstract The main purpose of this investigation is to compare the room temperature erosion behaviour of three stainless steels, namely 304, 316 and 410 SS. Towards this purpose, the erosion rates of all three stainless steels have been determined at three impact angles (30°, 60° and 90°) and at two impact velocities (98 and 129 m s−1) for each angle. The results indicate that while the erosion rates of 304 and 316 SS are comparable, that of 410 SS is lower by 15%–20%. The improved erosion resistance of 410 SS, in spite of its lower ductility and strain-hardening capacity as compared with 304 and 316 SS, appears to be related to the fact that the depth to which plastic deformation extends beneath the eroded surface (L) is significantly lower in 410 SS and also to the presence of a “soft zone” beneath the eroded surface.