By Dr. Andreas W. Momber, Radovan Kovacevic (auth.)
Abrasive water jet machining was once brought to production ten years in the past and has been more and more used for treating hard-to-machine and multi-layered fabrics and instead instrument for milling, turning, drilling and sharpening. this can be the 1st complete assessment of the method, facing a vast variety of matters together with blending and acceleration techniques, fabric removing mechanisms, method optimization and fluid mechanics. factors are given because the e-book follows the improvement of an abrasive water jet machining approach, from instrument new release via to machining effects, supervision and keep watch over. This methodical trip throughout the box is marked by means of drawings, graphs and tables, a lot of that are being released right here for the 1st time. even though the e-book is written at an instructional point, it focuses greatly on useful purposes, which displays the authors' vast involvement with either laboratory learn and commercial practices.
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Extra info for Principles of Abrasive Water Jet Machining
Sample text
Spherity as well as roundness ranges from 0 for very angular particles to 1 for ideal round particles. 6a to characterize the shape of single abrasive particles for abrasive water jet cutting-processes [37, 38]. 12 2. Classification and Characterization of Abrasive Materials bp Ip dcircl. 5 Geometric form characteristics of abrasive particles a - sphericity b - roundness Vasek et al. 6b illustrates both parameters. For circles, Fo=l and Fshape=l. 6 gives some typical values for these parameters for different abrasive-material types.
75 mm), the piercing time is nearly unaffected. ~ ~ Gl 100 .!!! 4 discuss the influences of the orifice and focus dimensions on the process of abrasive acceleration and material cutting. 3 Alignment Between Orifice and Focus An essential feature of the efficiency of standard cutting heads for injectionabrasive water jets is the alignment between the orifice and focus. , bore axes for both lie along the same line. 9b). In linear misalignment, the two axes are parallel but not colinear. Galecki and Mazurkiewicz [66] show that a linear misalignment influences the pressure transmission between the water-jet orifice and focus significantly.
In this case, the abrasives mix into an annular air jet through an inner steel pipe. The high-speed water jet enters the mixing chamber through a side entry accelerates the mixture. Visualization experiments show that the abrasives mix very homogeneously. l1c illustrates a further alternative mixing principle. The water flow that centrally enters the mixing chamber is directly turned into a vortex flow that flows through the nozzle and forms a vortex water-jet. The rotated movement of the water jet generates improved abrasive suction-capability and mixing efficiency [73].