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.

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.

An Experimental Study of Radial-Mode Abrasive Waterjet Turning of Steels

2011 ◽  
Vol 697-698 ◽  
pp. 166-170 ◽  
Author(s):  
W.Y. Li ◽  
Jun Wang ◽  
Yasser M. Ali
Keyword(s):  
Experimental Study ◽  
Tilt Angle ◽  
Material Removal ◽  
High Surface ◽  
Machining Process ◽  
Radial Mode ◽  
Abrasive Waterjet ◽  
Depth Of Cut ◽  
Feed Speed ◽  
Statistical Experimental Design

An experimental study of a radial-mode abrasive waterjet (AWJ) turning of AISI4340 high tensile steel is presented. The major process parameters, i.e. feed speed, waterjet pressure, abrasive flow rate, nozzle tilt angle, and workpiece surface speed, are considered in a statistical experimental design. The advantages of the radial-mode AWJ turning over the offset-mode turning include maximum jet energy utilization, high surface speed, a variety of nozzle tilt angles and small nozzle standoff distance, to enable high material removal rate (MRR). It is found that the depth of cut is considerably increased when large nozzle tilt angle and high surface speed are used. It also shows that feed speed and waterjet pressure are the two most significant parameters to control the MRR. This preliminary study suggests that the radial-mode AWJ turning is feasible and can yield high material removal rates. Future research to advance the knowledge about this new machining process is also proposed.

An Experimental Study on Radial-Mode Abrasive Waterjet Turning of Alumina Ceramics

2013 ◽  
Vol 797 ◽  
pp. 27-32
Author(s):  
Zhong Bo Yue ◽  
Chuan Zhen Huang ◽  
Hong Tao Zhu ◽  
Jun Wang ◽  
Peng Yao ◽  
...  
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Removal Rate ◽  
Water Pressure ◽  
Radial Mode ◽  
Abrasive Waterjet ◽  
Feed Speed ◽  
Alumina Ceramics ◽  
Influence Of Process Parameters

A study on the radial-mode abrasive waterjet turning (AWJT) process is presented and discussed. An experimental investigation is carried out to explore the influence of process parameters on the depth of turning and material removal rate (MRR) when turning 96% alumina ceramics. The experiment is designed by the multifactor orthogonal experiment methods. The effect of feed speed, water pressure, abrasive mass flow rate, nozzle tilted angle and surface speed are investigated by the range analysis and variance analysis. The results show that the feed speed is the most significant variables affecting the depth of turning. Based on the test conditions, it is found that the most efficient conditions to maximize depth of turning are at a jet angle of 105 degree, a water pressure of 310MPa, an abrasive mass flow rate of 11.5 g/s, a surface speed of 5.5m/s and a feed speed of 0.05mm/s. At last, the effect mechanism of process variables on the depth of turning is analyzed qualitatively.

scholarly journals On the Effect of Multiple Passes on Kerf Characteristics and Efficiency of Abrasive Waterjet Cutting

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 74
Author(s):  
Panagiotis Karmiris-Obratański ◽  
Nikolaos E. Karkalos ◽  
Rafał Kudelski ◽  
Emmanouil L. Papazoglou ◽  
Angelos P. Markopoulos
Keyword(s):  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Machining Process ◽  
Abrasive Waterjet ◽  
Process Conditions ◽  
Cutting Efficiency ◽  
Depth Of Penetration ◽  
Waterjet Cutting ◽  
Abrasive Waterjet Cutting

Abrasive waterjet cutting is a well-established non-conventional technique for the processing of difficult-to-cut material and rendering of various complex geometries with high accuracy. However, as in every machining process, it is also required that high efficiency and productivity are achieved. For that reason, in the present study, the effect of performing the machining process by multiple passes is investigated, and the evaluation of this approach is performed in terms of total depth of penetration, kerf width, kerf taper angle, mean material removal rate, and cutting efficiency. In the case of multiple passes, the passes are performed in the same direction with the traverse speed adjusted accordingly in order to maintain the total machining time constant in each case. From the experimental results, it was found that the effect of multiple passes on the kerf characteristics, mean material removal rate, and cutting efficiency depends on the process conditions, especially regarding the depth of penetration, and it is possible to achieve significantly higher efficiency by the multi-pass cutting technique when the appropriate process conditions are selected.

A Surface Roughness Model in Radial-Mode Abrasive Waterjet Turning for High-Tensile Steels

2013 ◽  
Vol 483 ◽  
pp. 177-181 ◽  
Author(s):  
Wei Yi Li ◽  
Hong Tao Zhu ◽  
Jun Wang ◽  
Chuan Zhen Huang
Keyword(s):  
Surface Roughness ◽  
Water Pressure ◽  
Steel Specimen ◽  
Machining Process ◽  
Radial Mode ◽  
Abrasive Waterjet ◽  
Average Error ◽  
Future Research ◽  
Feed Speed ◽  
Analysis Technique

Abrasive waterjet (AWJ) machining is an emerging machining method to process all kinds of difficult-to-cut materials. In this paper, a mathematical model for the surface roughness generated by a radial-mode AWJ turning process on a high-tensile steel specimen is developed using a dimensional analysis technique. To verify the model, a series of statistically designed experiments are carried out where feed speed, water pressure, abrasive flow rate, nozzle tilt angle, and workpiece surface speed are considered as variables. The model predictions are found to be in good agreement with the experimental results with the average error of 4.3%. Future research to advance the knowledge about this new machining process is also proposed.

Impact Erosion of Quartz Crystals by Micro-Particles in Abrasive Waterjet Micro-Machining

2013 ◽  
Vol 797 ◽  
pp. 46-51 ◽  
Author(s):  
H. Qi ◽  
J.M. Fan ◽  
Jun Wang
Keyword(s):  
Material Removal ◽  
Impact Angle ◽  
Machining Process ◽  
Abrasive Waterjet ◽  
Small Scale ◽  
Material Strength ◽  
Micro Machining ◽  
Micro Particles ◽  
Crater Volume ◽  
The Impact

Abrasive waterjet (AWJ) micro-machining is a precision processing technology with some distinct advantages. To understand the machining process, the erosion mechanism is presented and discussed when micro-particle impacting on a quartz crystal specimen. It is found that three types of impressions are formed which are craters, micro-dents and scratches. Small-scale craters including crashed zones and radial cracks are associated with plastic flow and subsurface micro-cracks that decrease the material strength, but cause little material removal, while large-scale craters including conchoidal fractures caused by the propagation of lateral cracks dominate the volume change of the specimen. Micro-dents are produced by the impact of particles possessing small kinetic energies, and scratches are generated by particle sliding or rolling over the target surface and make a negligible contribution to material removal. The crater volume generated by the impact of individual particle is then discussed with respect to particle impacting velocity and impact angle. It shows that an increase in particle impact angle or particle velocity increases the crater volume due to the increased conchoidal fractures during the impact process.

Analysis on vibration characteristics of screw in filling process of dynamic injection molding machine

2016 ◽  
Vol 36 (8) ◽  
pp. 861-866 ◽  
Author(s):  
Quan Wang ◽  
Zhenghuan Wu
Keyword(s):  
Injection Molding ◽  
Processing Parameters ◽  
Axial Vibration ◽  
Filling Process ◽  
Molding Machine ◽  
Lumped Mass ◽  
Injection Molding Machine ◽  
Injection Speed ◽  
And Performance ◽  
Injection Screw

Abstract This paper presents a study of the characteristics of axial vibration of a screw in the filling process for a novel dynamic injection molding machine. By simplifying a generalized model of the injection screw, physical and mathematic models are established to describe the dynamic response of the axial vibration of a screw using the method of lumped-mass. The damping coefficient of the screw is calculated in the dynamic filling process. The amplitude-frequency characteristics are analyzed by the simulation and experimental test of polypropylene. The results show that the amplitude of a dynamic injection molding machine is not only is related to structure parameters of the screw and performance of the material, such as non-Newtonian index, but also depends on the processing parameters, such as vibration intensity and injection speed.

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