Geometrical modelling of abrasive waterjet footprints: A study for 90° jet impact angle

CIRP Annals ◽  
2010 ◽  
Vol 59 (1) ◽  
pp. 341-346 ◽  
Author(s):  
D.A. Axinte ◽  
D.S. Srinivasu ◽  
J. Billingham ◽  
M. Cooper
Keyword(s):  
Impact Angle ◽  
Abrasive Waterjet ◽  
Geometrical Modelling ◽  
Jet Impact

A Visualization Study of the Radial-Mode Abrasive Waterjet Turning Process for Alumina Ceramics

2013 ◽  
Vol 797 ◽  
pp. 9-14 ◽  
Author(s):  
Mirza Ahmed Ali ◽  
Jing Ming Fan ◽  
Hong Tao Zhu ◽  
Jun Wang
Keyword(s):  
Water Pressure ◽  
Impact Angle ◽  
Radial Mode ◽  
Abrasive Waterjet ◽  
Feed Speed ◽  
Alumina Ceramics ◽  
Turning Process ◽  
Jet Impact ◽  
Designed Experiment ◽  
Pressure Nozzle

A visualization study of the radial-mode abrasive waterjet (AWJ) turning process on an alumina ceramic is presented to gain an understanding of cutting front development process and hence the material removal mechanisms. A statistically designed experiment is conducted to study the effects of process parameters on the development of the cutting front, considering the change of water pressure, nozzle feed speed and nozzle tilt angle. It is found that the most significant parameters affecting the cutting front development are feed speed and water pressure. Further, the actual jet impact angle is dependent on both the water pressure and feed speed, but at higher water pressures the actual impact angle tends to become independent of feed speed, while water pressure becomes the dominating factor.

Micro-grooving on quartz crystals by an abrasive air jet

2011 ◽  
Vol 225 (9) ◽  
pp. 2161-2173 ◽  
Author(s):  
J Wang ◽  
A Moridi ◽  
P Mathew
Keyword(s):  
Performance Measures ◽  
Process Parameters ◽  
Traverse Speed ◽  
Groove Depth ◽  
Impact Angle ◽  
Quartz Crystals ◽  
Air Jet ◽  
Jet Impact ◽  
Mass Flowrate ◽  
Micro Grooving

An investigation of the micro-grooving performance of abrasive air jet (AAJ) on quartz crystals is presented and discussed. An experimental study was carried out first to understand the effect of process parameters on the major grooving performance measures such as groove depth, groove width, kerf taper, and surface roughness. Plausible trends for these grooving performance measures with respect to the various process variables, such as air pressure, nozzle traverse speed, jet impact angle, and abrasive mass flowrate, are discussed. It is found that AAJ is an effective technology for micromachining of quartz crystals and the grooving performance can be improved or optimized by selecting the process parameters properly. Predictive models are then developed for quantitatively estimating the micro-grooving performance. The models are finally verified by an experiment. It shows that the model predictions are in good agreement with the experimental results under the corresponding conditions.

Mathematical Modeling of Abrasive Waterjet Turning of Ductile Materials

2010 ◽  
Author(s):  
Iman Zohourkari ◽  
Mehdi Zohoor
Keyword(s):  
Abrasive Particle ◽  
Experimental Tests ◽  
Traverse Speed ◽  
Impact Angle ◽  
Abrasive Waterjet ◽  
Continuous Change ◽  
Turning Process ◽  
Ductile Materials ◽  
Proposed Model ◽  
Cylindrical Workpiece

In this paper, an erosion-based model for abrasive waterjet (AWJ) turning process is presented. In the AWJ turning process a particular volume of material is removed by impacting of abrasive particles to the surface of the rotating cylindrical workpiece. This volume is estimated according to the modified Hashish erosion model; thus radius reduction at each revolution is calculated. The distinctively proposed model considers the continuous change in local impact angle due to change in workpiece diameter, axial traverse speed of the jet, the abrasive particle roundness and density. The accuracy of the proposed model is approved by experimental tests under various traverse speeds. The final diameters estimated by the new model are in good accordance with the experiments.

A Study on Erosion of Alumina Wafer in Abrasive Water Jet Machining

2014 ◽  
Vol 1017 ◽  
pp. 228-233 ◽  
Author(s):  
Yong Wang ◽  
Hong Tao Zhu ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Peng Yao ◽  
...  
Keyword(s):  
Process Parameters ◽  
Water Pressure ◽  
Abrasive Particle ◽  
Particle Diameter ◽  
Water Jet ◽  
Abrasive Waterjet ◽  
Abrasive Water Jet ◽  
Alumina Ceramics ◽  
Abrasive Water Jet Machining ◽  
Jet Impact

Abrasive water jet machining is considered as a promising technique in hard and brittle material processing. This paper studies the erosion performance of the alumina ceramics in the different process parameters. In the erosion experiments, alumina ceramics wafers were eroded by the abrasive waterjet machining. The single factor experiments were carried out to understand the effect of different process parameters (jet impact angle, standoff distance, water pressure, abrasive particle diameter) on the material removal rate (MRR), the removal depth and surface roughness (Ra). The experimental results can provide guidance for alumina ceramics abrasive water jet cutting and polishing.

Boundary condition for deformation wear mode material removal in abrasive waterjet milling: Theoretical and experimental analyses

2017 ◽  
Vol 233 (1) ◽  
pp. 55-68 ◽  
Author(s):  
R Srikanth ◽  
N Ramesh Babu
Keyword(s):  
Boundary Condition ◽  
Material Removal ◽  
Impact Angle ◽  
Solid Particles ◽  
Abrasive Waterjet ◽  
Abrasive Particles ◽  
Modeling Methodology ◽  
Wear Mode ◽  
Abrasive Waterjets ◽  
Average Size

Producing quality features with abrasive waterjet milling requires the generation of shallow kerfs with low surface waviness. Typically, such kerfs are produced by deformation wear mode of material removal realized with certain combination of process parameters chosen based on an elaborate experimental analysis. Instead, these parameters can be selected through a modeling methodology developed based on deformation wear erosion theory. As a first part of this development, it is essential to identify the conditions for the prevalence of deformation wear during the generation of shallow kerfs with abrasive waterjets. To establish this condition, this article presents a theoretical analysis of kerf formation formulated based on deformation wear erosion by solid particles. In this analysis, the interaction of the abrasive particles with the material and the subsequent material removal through deformation wear is considered to define the geometry of the cutting front. The geometry of the cutting front was then used to determine the condition at which local impact angle of abrasives striking the cutting front changes to alter the mode of material removal from deformation wear to cutting wear. This analysis has brought out the boundary condition for deformation wear as the maximum depth of kerf to be equal to the average size of the abrasive particles used in the jet. The generic nature of this condition is established with kerfing experiments over three different ductile materials.

scholarly journals Rock-Breaking Properties Under the Rotatory Impact of Water Jets in Water Jet Drilling

2019 ◽  
Vol 9 (24) ◽  
pp. 5417 ◽  
Author(s):  
Zhaolong Ge ◽  
Lei Wang ◽  
Man Wang ◽  
Zhe Zhou ◽  
Songqiang Xiao ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Rotation Speed ◽  
Impact Angle ◽  
Rock Breaking ◽  
Water Jet ◽  
Drill Bit ◽  
Rock Breakage ◽  
Jet Impact ◽  
Tension State ◽  
Optimum Water

Water jet drilling is widely used to develop coalbed methane reservoirs. The water jet drill bit is the core component, and a self-rotating bit is an economical bit because of its high rock-breaking efficiency and low energy consumption. Because the important parameters concerning the rock-breaking efficiency of these drill bits are unclear, this study carried out rock-breaking experiments on water jet rotation under different conditions of drill bit rotation speed, jet pressure, and jet impact angle. How the rock was fractured and eroded under these different conditions was analyzed. The results show that the volume of rock broken under rotary jet erosion increases exponentially with increasing jet pressure. The rock-breaking depth is the most important factor that influences the volume of rock broken, whereas the diameter of the area broken is a secondary factor. There is an optimum water jet rotation speed for the most efficient rock breakage, and this rotation speed is positively correlated with jet pressure. There is also an optimum water jet impact angle for rock breaking, and, in our experiments, this angle was 10°. The rotary impact of the water jet causes the rock to be in a three-way tension state, and this reduces the water cushion effect and jet reflection. This study can be used as a reference and guide for optimizing the design of self-rotating water jet bits and the determination of reasonable drilling parameters.

Theoretical Model of Surface Roughness for Polishing Super Hard Materials with Abrasive Waterjet

2008 ◽  
Vol 375-376 ◽  
pp. 465-469 ◽  
Author(s):  
Cui Lian Che ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu ◽  
Quan Lai Li
Keyword(s):  
Surface Roughness ◽  
Water Pressure ◽  
Impact Angle ◽  
Abrasive Waterjet ◽  
Abrasive Water Jet ◽  
Hard Materials ◽  
Elastic Distortion ◽  
The Impact ◽  
The Relationship ◽  
Abrasive Size

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.

Study on the Effect of Standoff Distance on Processing Performance of Alumina Ceramics in Two Modes of Abrasive Waterjet Turning Patterns

2013 ◽  
Vol 797 ◽  
pp. 21-26 ◽  
Author(s):  
Dun Liu ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu ◽  
Peng Yao ◽  
...  
Keyword(s):  
Processing Parameters ◽  
Impact Angle ◽  
Machining Process ◽  
Radial Mode ◽  
Standoff Distance ◽  
Abrasive Waterjet ◽  
Alumina Ceramics ◽  
Depth Of Penetration ◽  
Cylindrical Parts ◽  
And Performance

Abrasive waterjet (AWJ) turning is an emerging technology, which plays an important role in machining cylindrical parts with the distinct advantages of negligible thermal effects and extremely low cutting force. This paper presents an experimental study of abrasive waterjet turning (AWJT) of Al2O3ceramics. The machining process and performance in terms of the depth of penetration (DOP), surface roughness (Ra) and actual impact angle (β) are discussed to understand the effect of standoff distance (SOD) on the processing performance at two different turning modes. Based on the results of these investigations, there is a significant change ofDOPandRaat differentSODin radial mode turning and the optimalSODof gaining maximumDOPand the minimumRais about 5.5mm.However, theDOPis nearly independent on theSODin offset mode turning. SmallerRaandDOPcan be obtained in offset mode. Furthermore, the results indicate that the roundness error of cylinder parts is probably improved with the properSODinterval in radial mode turning and it is suitable for machining cylinder part with considerably different radial size. The offset mode turning as the next operation after radial mode turning is recommended to process workpiece with excellent roundness. In this way, by understanding the effect ofSODon processing alumina ceramics, the paper establishes a good basis for developing strategies for optimizing processing parameters in order to generate the desired part geometry and achieve better surface quality.

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