Abrasive Waterjet Machining

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Jun Wang - One of the best experts on this subject based on the ideXlab platform.

  • investigation on erosion mechanism in ultrasonic assisted Abrasive Waterjet Machining
    The International Journal of Advanced Manufacturing Technology, 2018
    Co-Authors: Zhe Lv, Chuanzhen Huang, Jun Wang
    Abstract:

    The Abrasive erosion mechanism in ultrasonic assisted Abrasive Waterjet Machining is investigated in the present study. The process was theoretically analyzed and a numerical model for the Abrasive particle impact process considering the target workpiece vibration was developed. A time-dependent load was imposed on the model boundary to apply the vibration. The model was utilized to investigate the response of target material with explicit dynamic method. Effects of ultrasonic vibration and other process parameters on the material removal and response such as residual stress were investigated. Analysis on erosion process by multiple particles in ultrasonic vibration assisted AWJ was also carried out. The model was finally verified by experiments. The results indicate that the application of ultrasonic vibration can enhance the material removal capacity of the Abrasive particle and intensify the material deformation.

  • A Study on Ultrasonic Torsional Vibration-Assisted Abrasive Waterjet Polishing of Ceramic Materials
    Advanced Materials Research, 2016
    Co-Authors: Yong Wang, Chuanzhen Huang, Jun Wang
    Abstract:

    Abrasive Waterjet Machining is considered as a promising technique in hard-brittle material polishing. In this paper, The ultrasonic torsional vibration is considered to apply on the workpiece to improve the Abrasive Waterjet polishing quality and efficiency. The process parameters in the ultrasonic torsional vibration-assisted Abrasive Waterjet polishing are optimized. The ultrasonic torsional vibration in the role of the Abrasive Waterjet polishing is investigated. The results show that the application of ultrasonic torsional vibration can effect of Abrasive particle movement and increase the critical depth of the ceramic materials.

  • an experimental study of Abrasive Waterjet Machining of ti 6al 4v
    The International Journal of Advanced Manufacturing Technology, 2015
    Co-Authors: Huaizhong Li, Jun Wang
    Abstract:

    This paper presents an experimental study on Abrasive Waterjet (AWJ) Machining of the most commonly used titanium alloy, Ti-6Al-4V. Two types of Machining operations, i.e. drilling (or piercing) and slotting, were conducted. For the drilling experiments, the influences of water pressure and drilling time were investigated. It was found that both the hole depth and diameter increased as drilling time increased but in a decreasing rate. An increase in the water pressure increased both the hole depth and the hole diameter. For the slot cutting, the influence of water pressure and the traverse speed were investigated. A slower traverse speed resulted in a deeper depth of cut. The kerf showed a taper shape with a wider entry on top, and the width decreased as jet cut into the material. At the bottom of the kerf, a pocket was generated. The variation of the depth of cut became insignificant when the traverse speed was increased.

  • fem analysis on the Abrasive erosion process in ultrasonic assisted Abrasive Waterjet Machining
    The International Journal of Advanced Manufacturing Technology, 2015
    Co-Authors: Zhe Lv, Chuanzhen Huang, Jun Wang
    Abstract:

    In this work, a finite element method (FEM) explicit dynamic simulation was employed to investigate the Abrasive erosion process in ultrasonic-assisted Abrasive Waterjet (AWJ) Machining. Johnson-Holmquist ceramic material model with failure criteria was utilized to realize the deletion of the failure elements for the simulation of material removal. The effects of impact angle and particle shape on the erosion rate were analyzed. The residual stress in workpiece induced by the erosion under the vibration condition was compared to that under the non-vibration condition. Furthermore, the ultrasonic-assisted erosion processes of multiple particles under different overlapping conditions on the impact areas were simulated. The simulation results show that the application of vibration can effectively improve the erosion rate and influences the contact process between the particle and the workpiece surface. The residual stress distribution in the section of workpiece parallel to the vibration direction is not symmetric under the vibration condition, which is quite different from the nearly symmetric one obtained without vibration.

  • an sph simulation on vibration assisted Abrasive erosion of hard brittle material in Abrasive Waterjet Machining
    Advanced Materials Research, 2014
    Co-Authors: Zhe Lv, Chuanzhen Huang, Jun Wang
    Abstract:

    Abrasive Waterjet Machining (AWJ) is one of the fastest growing non-conventional Machining methods. However, low pressure and fine Abrasive implemented in AWJ precision Machining for reducing the surface damage reduce the efficiency. Therefore ultrasonic vibration is considered to apply on the workpiece to improve the Machining efficiency. In order to analyze the effect of the vibration on erosion in AWJ Machining, smoothed particle hydrodynamics (SPH) is used to simulate the erosion process for avoiding the mesh distortion in finite element method (FEM) when simulating large deformation and high strain rate problems. The results show that the application of ultrasonic vibration can effectively improve the erosion rate due to the dynamics variation of the erosion process.

Chuanzhen Huang - One of the best experts on this subject based on the ideXlab platform.

  • research on cavitation involved in ultrasonic assisted Abrasive Waterjet Machining
    The International Journal of Advanced Manufacturing Technology, 2019
    Co-Authors: Zhe Lv, Tao Wang, Chuanzhen Huang
    Abstract:

    The cavitation characteristics involved in ultrasonic-assisted Abrasive Waterjet were analyzed in the present study. The fluid field corresponding to ultrasonic-assisted AWJ was investigated through utilizing computational fluid dynamics. A cavitation model was adopted to simulate the mass transfer between water liquid and vapor phases. The evolution of cavitation during the impacting process and the effects of vibration parameters on cavitating characteristics were investigated. Moreover, a set of experiments were performed to evaluate the effects of ultrasonic-induced cavitation on erosion and material removal of ceramics. The results indicated that the evolution of cavitation had dependency on the fluid pressure and turbulence at impacted zone, and the synergetic erosion of microjets and accelerated particles induced by collapsing cavitation bubbles can evidently enhance the material removal. The material removal rate was improved by 82% at most under ultrasonic vibration.

  • numerical research on erosion involved in ultrasonic assisted Abrasive Waterjet Machining
    The International Journal of Advanced Manufacturing Technology, 2019
    Co-Authors: Zhe Lv, Xuesong Chen, Chuanzhen Huang
    Abstract:

    The impact erosion of particle in Abrasive Waterjet has the features of short duration of time and small scale of the deformation area, which lead to difficulty on implementing comprehensive investigation. As a meshless method, smoothed particle hydrodynamics is appropriate for dealing with high strain rate and large deformation issues such as impact dynamics. In this work, the erosive wear of aluminum nitride target material induced by incident particle in ultrasonic-assisted Abrasive Waterjet Machining was investigated through establishing a 3D hybrid smoothed particle hydrodynamics-finite elements model. The results indicated that the parameters such as particle shape, impact angle, and impact velocity have remarkable effects on the erosion mechanism. The ultrasonic vibration influences the dynamic process of particle penetration and the deformation of eroded target material. Multi-impacts were also simulated and the results indicated that the erosion was influenced by the overlapping condition and ultrasonic vibration. The numerical results were verified by the experiments utilizing the specially developed setup.

  • Investigation on flow field of ultrasonic-assisted Abrasive Waterjet using CFD with discrete phase model
    The International Journal of Advanced Manufacturing Technology, 2018
    Co-Authors: Zhe Lv, Y.b. Tian, Chuanzhen Huang
    Abstract:

    The characteristics of flow field have significant influence on impact erosions of containing particles in Abrasive Waterjet Machining. However, measurement of velocity and pressure distributions in flow field is hard to implement. In present study, computational fluid dynamics (CFD) is utilized to model the Abrasive Waterjet flow field in ultrasonic-assisted Abrasive Waterjet Machining with the aid of discrete phase method. The workpiece vibration is simulated by using dynamic mesh method. The effect of ultrasonic vibration on pressure and velocity distributions was investigated, as well as the particle impact parameters such as local impact angle and velocity. The results indicate that the pressure value is lower when vibration is applied on target and the lateral flow along the vibration direction is enhanced and affected the high pressurized water film. Moreover, the particle velocity is higher when vibration is introduced due to the fact that the weakening of stagnation effect owing to the shear of vibrating target surface. In addition, ultrasonic-assisted Abrasive Waterjet erosion experiments were conducted to explore the practical effects on material removal and erosion mechanism. The experimental results verify that application of ultrasonic vibration is considered to facilitate the material removal of Abrasive Waterjet.

  • investigation on erosion mechanism in ultrasonic assisted Abrasive Waterjet Machining
    The International Journal of Advanced Manufacturing Technology, 2018
    Co-Authors: Zhe Lv, Chuanzhen Huang, Jun Wang
    Abstract:

    The Abrasive erosion mechanism in ultrasonic assisted Abrasive Waterjet Machining is investigated in the present study. The process was theoretically analyzed and a numerical model for the Abrasive particle impact process considering the target workpiece vibration was developed. A time-dependent load was imposed on the model boundary to apply the vibration. The model was utilized to investigate the response of target material with explicit dynamic method. Effects of ultrasonic vibration and other process parameters on the material removal and response such as residual stress were investigated. Analysis on erosion process by multiple particles in ultrasonic vibration assisted AWJ was also carried out. The model was finally verified by experiments. The results indicate that the application of ultrasonic vibration can enhance the material removal capacity of the Abrasive particle and intensify the material deformation.

  • Experimental study on pulsation behavior of the ultrasonic vibration-assisted Abrasive Waterjet
    The International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Chuanzhen Huang
    Abstract:

    With an aim to improve the efficiency of Abrasive Waterjet Machining, the ultrasonic vibration is used in the process of the Abrasive Waterjet Machining. The impacting force of the ultrasonic vibration-assisted Abrasive Waterjet is measured by the piezoelectric crystals dynamic signal tester. The experimental result indicates that the pulsation behavior of the Abrasive Waterjet is enhanced, and the pulsation frequency and amplitude are significantly increased, the average impacting force of the Abrasive water jet is higher than that without ultrasonic vibration. The experiment also indicates that the pulsation amplitude of the jet is greatly affected by the system pressure and Abrasive addition, and the pulsation amplitude is slowly reduced with the jet pressure increasing and Abrasive adding.

Ahmet Hascalik - One of the best experts on this subject based on the ideXlab platform.

  • effect of traverse speed on Abrasive Waterjet Machining of age hardened inconel 718 nickel based superalloy
    Materials and Manufacturing Processes, 2010
    Co-Authors: Mustafa Ay, Ulas Caydas, Ahmet Hascalik
    Abstract:

    In this study, the effect of traverse speed on Abrasive Waterjet Machining (AWJM) of Inconel 718 nickel-based superalloy was experimentally investigated. In the experiments, six different traverse speeds of 80, 130, 180, 230, 280, and 330 mm/min were employed. Following the tests, the surface roughness of the machined job, the kerf taper ratio, and kerf wideness were measured. The characteristics of machined surface were also investigated using scanning electron microscope (SEM) and atomic force microscope (AFM). As a consequence, it is observed that the surface roughness and kerf taper ratio tended to increase with traverse speed, while kerf wideness decreased.

  • a study on surface roughness in Abrasive Waterjet Machining process using artificial neural networks and regression analysis method
    Journal of Materials Processing Technology, 2008
    Co-Authors: Ulas Caydas, Ahmet Hascalik
    Abstract:

    In the present study, artificial neural network (ANN) and regression model were developed to predict surface roughness in Abrasive Waterjet Machining (AWJ) process. In the development of predictive models, Machining parameters of traverse speed, Waterjet pressure, standoff distance, Abrasive grit size and Abrasive flow rate were considered as model variables. For this purpose, Taguchi's design of experiments was carried out in order to collect surface roughness values. A feed forward neural network based on back propagation was made up of 13 input neurons, 22 hidden neurons and one output neuron. The 13 sets of data were randomly selected from orthogonal array for training and residuals were used to check the performance. Analysis of variance (ANOVA) and F-test were used to check the validity of regression model and to determine the significant parameter affecting the surface roughness. The statistical analysis showed that the Waterjet pressure was an utmost parameter on surface roughness. The microstructures of machined surfaces were also studied by scanning electron microscopy (SEM). The SEM investigations revealed that AWJ Machining produced three distinct zones along the cut surface of AA 7075 aluminium alloy and surface striations and waviness were increased significantly with jet pressure.

  • effect of traverse speed on Abrasive Waterjet Machining of ti 6al 4v alloy
    Materials & Design, 2007
    Co-Authors: Ahmet Hascalik, Ulas Caydas, Hakan Gurun
    Abstract:

    Abstract In the presented study, Ti–6Al–4V alloy, known as one of the difficult-to-machine materials using conventional Machining processes, was machined under varying traverse speeds of 60, 80, 120, 150, 200, and 250 mm/min by Abrasive Waterjet (AWJ) Machining. After Machining, the profiles of machined surfaces, kerf geometries and microstructural features of the machined surfaces were examined using surface profilometry and scanning electron microscopy (SEM). The experimental results indicate that the traverse speed of the jet is a significant parameter on the surface morphology, and the widths and features of different regions formed in the cutting surface change according to the traverse speed. It was also observed that the kerf taper ratio and surface roughness increase with increasing traverse speed in chosen conditions.

  • Effect of traverse speed on Abrasive Waterjet Machining of Ti–6Al–4V alloy
    Materials & Design, 2006
    Co-Authors: Ahmet Hascalik, Ulas Caydas, Hakan Gurun
    Abstract:

    Abstract In the presented study, Ti–6Al–4V alloy, known as one of the difficult-to-machine materials using conventional Machining processes, was machined under varying traverse speeds of 60, 80, 120, 150, 200, and 250 mm/min by Abrasive Waterjet (AWJ) Machining. After Machining, the profiles of machined surfaces, kerf geometries and microstructural features of the machined surfaces were examined using surface profilometry and scanning electron microscopy (SEM). The experimental results indicate that the traverse speed of the jet is a significant parameter on the surface morphology, and the widths and features of different regions formed in the cutting surface change according to the traverse speed. It was also observed that the kerf taper ratio and surface roughness increase with increasing traverse speed in chosen conditions.

Dragos Axinte - One of the best experts on this subject based on the ideXlab platform.

  • dual processing by Abrasive Waterjet Machining a method for Machining and surface modification of nickel based superalloy
    Journal of Materials Processing Technology, 2020
    Co-Authors: Zhirong Liao, Dragos Axinte, Irati Sanchez, Dongdong Xu, Giedrius Augustinavicius, Anders Wretland
    Abstract:

    © 2020 Elsevier B.V. Abrasive Waterjet (AWJ) is widely used for Machining of advanced (e.g. nickel-based) superalloys as it offers high material removal rates and low cutting temperatures. However, the inadequate surface integrity, e.g. large number of scratches and embedded particles in the machined surface, which would induce severe deteriorations of the materials functional performance, has been one of the greatest issues of the AWJ Machining technique. To solve this problem, this research proposed a dual-process Abrasive Waterjet Machining method, whereby two different functions of Abrasive Waterjet were employed: materials removal (first process) and surface modification (secondary process), hence, to improve the workpiece surface integrity. Two types of entrained particles, i.e. with sharp cutting edges (e.g. garnet) and smooth surfaces (e.g. stainless steel ball), that depending on their kinetic energy density can either cut or modify the workpiece surface respectively, are employed for these the two constitutive processes of the proposed dual-Waterjet Machining method. A critical standoff distance and inclination angle of the Waterjet nozzle has been defined for the surface modification process thus, to eliminate the embedded particles and scratches left by the first cutting process while also introducing a surface strengthening effect. To support this approach, a mathematical model has been proposed for determining the surface modification parameters (e.g. jet feed speed and Abrasive flow rate). In-depth analysis of the microstructural and metallurgical alternations of the machined workpiece surface and superficial layer have also been conducted to reveal the mechanisms responsible for the surface damage elimination and surface strengthening. Moreover, a four point bending fatigue test has been conducted to validate the mechanical performance, whereby a significant improvement of the fatigue life on the machined workpiece was achieved when compared with the case that single AWJ cutting method (91 %) and conventional Machining (34 %) are employed. This proves that the proposed dual-processing AWJ Machining method is of high efficiency to improve the functional performance of components on a single machine tool platform.

  • dual processing by Abrasive Waterjet Machining a method for Machining and surface modification of nickel based superalloy
    Journal of Materials Processing Technology, 2020
    Co-Authors: Zhirong Liao, Dragos Axinte, Irati Sanchez, Dongdong Xu, Giedrius Augustinavicius, Anders Wretland
    Abstract:

    Abstract Abrasive Waterjet (AWJ) is widely used for Machining of advanced (e.g. nickel-based) superalloys as it offers high material removal rates and low cutting temperatures. However, the inadequate surface integrity, e.g. large number of scratches and embedded particles in the machined surface, which would induce severe deteriorations of the materials functional performance, has been one of the greatest issues of the AWJ Machining technique. To solve this problem, this research proposed a dual-process Abrasive Waterjet Machining method, whereby two different functions of Abrasive Waterjet were employed: materials removal (first process) and surface modification (secondary process), hence, to improve the workpiece surface integrity. Two types of entrained particles, i.e. with sharp cutting edges (e.g. garnet) and smooth surfaces (e.g. stainless steel ball), that depending on their kinetic energy density can either cut or modify the workpiece surface respectively, are employed for these the two constitutive processes of the proposed dual-Waterjet Machining method. A critical standoff distance and inclination angle of the Waterjet nozzle has been defined for the surface modification process thus, to eliminate the embedded particles and scratches left by the first cutting process while also introducing a surface strengthening effect. To support this approach, a mathematical model has been proposed for determining the surface modification parameters (e.g. jet feed speed and Abrasive flow rate). In-depth analysis of the microstructural and metallurgical alternations of the machined workpiece surface and superficial layer have also been conducted to reveal the mechanisms responsible for the surface damage elimination and surface strengthening. Moreover, a four point bending fatigue test has been conducted to validate the mechanical performance, whereby a significant improvement of the fatigue life on the machined workpiece was achieved when compared with the case that single AWJ cutting method (91%) and conventional Machining (34%) are employed. This proves that the proposed dual-processing AWJ Machining method is of high efficiency to improve the functional performance of components on a single machine tool platform.

  • Dual-processing by Abrasive Waterjet Machining—A method for Machining and surface modification of nickel-based superalloy
    Journal of Materials Processing Technology, 2020
    Co-Authors: Zhirong Liao, Dragos Axinte, Irati Sanchez, Dongdong Xu, Giedrius Augustinavicius, Anders Wretland
    Abstract:

    © 2020 Elsevier B.V. Abrasive Waterjet (AWJ) is widely used for Machining of advanced (e.g. nickel-based) superalloys as it offers high material removal rates and low cutting temperatures. However, the inadequate surface integrity, e.g. large number of scratches and embedded particles in the machined surface, which would induce severe deteriorations of the materials functional performance, has been one of the greatest issues of the AWJ Machining technique. To solve this problem, this research proposed a dual-process Abrasive Waterjet Machining method, whereby two different functions of Abrasive Waterjet were employed: materials removal (first process) and surface modification (secondary process), hence, to improve the workpiece surface integrity. Two types of entrained particles, i.e. with sharp cutting edges (e.g. garnet) and smooth surfaces (e.g. stainless steel ball), that depending on their kinetic energy density can either cut or modify the workpiece surface respectively, are employed for these the two constitutive processes of the proposed dual-Waterjet Machining method. A critical standoff distance and inclination angle of the Waterjet nozzle has been defined for the surface modification process thus, to eliminate the embedded particles and scratches left by the first cutting process while also introducing a surface strengthening effect. To support this approach, a mathematical model has been proposed for determining the surface modification parameters (e.g. jet feed speed and Abrasive flow rate). In-depth analysis of the microstructural and metallurgical alternations of the machined workpiece surface and superficial layer have also been conducted to reveal the mechanisms responsible for the surface damage elimination and surface strengthening. Moreover, a four point bending fatigue test has been conducted to validate the mechanical performance, whereby a significant improvement of the fatigue life on the machined workpiece was achieved when compared with the case that single AWJ cutting method (91 %) and conventional Machining (34 %) are employed. This proves that the proposed dual-processing AWJ Machining method is of high efficiency to improve the functional performance of components on a single machine tool platform.

  • erosion mechanisms during Abrasive Waterjet Machining model microstructures and single particle experiments
    Journal of Materials Processing Technology, 2017
    Co-Authors: Maxime Mieszala, Dragos Axinte, Lozano P Torrubia, Jakob Schwiedrzik, S Mischler, J Michler, Laetitia Philippe
    Abstract:

    The erosion mechanisms during Abrasive Waterjet (AWJ) Machining have been examined for a variety of materials. However, no systematic study has considered the effect of the microstructure–property relationship on the erosion mechanisms in metals. In this work, the influence of microstructure and mechanical properties on the erosion mechanisms is investigated using AWJ controlled-depth milling and single particle impact experiments performed on nanocrystalline, microcrystalline and single crystal nickel samples. The resulting footprints and subsurface microstructure evolution were analysed using advanced characterization techniques. The erosion rate of the target metal is found to correlate positively with grain size and negatively with hardness but this correlation is nonlinear. The subsurface microstructure of the single crystal and microcrystalline are altered, while only the texture of the nanocrystalline nickel is modified. The grain refinement mechanism observed in microcrystalline and single crystal microstructure is elucidated by electron backscatter diffraction. It proceeds by the generation of dislocations under severe plastic deformation, which transforms into subgrains before forming new grains under further strain. Therefore, severe plastic deformation induced by AWJ Machining leads to surface nanocrystallization and induces substantial subsurface work-hardening, as revealed by nanoindentation tests and confirmed by single particle impacts, with the consequence that the erosion rate decreases with decreasing grain size. This work clarifies the erosion mechanisms in pure metals and highlights the dynamic nature of AWJ Machining as a result of the complex interplay between microstructure, mechanical properties and material removal mechanisms, providing new insights into AWJ controlled-depth milling technique.

  • the linear inverse problem in energy beam processing with an application to Abrasive Waterjet Machining
    International Journal of Machine Tools & Manufacture, 2015
    Co-Authors: Bilbao A Guillerna, Dragos Axinte, J Billingham
    Abstract:

    The linear inverse problem for energy beam processing, in which a desired etched profile is known and a trajectory of the beam that will create it must be found, is studied in this paper. As an example, Abrasive Waterjet Machining (AWJM) is considered here supported by extensive experimental investigations. The behaviour of this process can be described using a linear model when the angle between the jet and the surface is approximately constant during the process, as occurs for shallow etched profiles. The inverse problem is usually solved by simply controlling dwell time in proportion to the required depth of milling, without considering whether the target surface can actually be etched. To address this, a Fourier analysis Is used to show that high frequency components in the target surface cannot be etched due to the geometry of the jet and the dynamics of the machine. In this paper, this frequency domain analysis is used to improve the choice of the target profile in such a way that it can be etched. The dynamics of the machine also have a large influence on the actual movement of the jet. It is very difficult to describe this effect because the controller of the machine is usually unknown. A simple approximation is used for the choice of the slope of a step profile. The tracking error between the desired trajectory and the real one is reduced and the etched profile is improved. Several experimental tests are presented to show the usefulness of this approach. Finally, the limitations of the linear model are studied.

Ulas Caydas - One of the best experts on this subject based on the ideXlab platform.

  • effect of traverse speed on Abrasive Waterjet Machining of age hardened inconel 718 nickel based superalloy
    Materials and Manufacturing Processes, 2010
    Co-Authors: Mustafa Ay, Ulas Caydas, Ahmet Hascalik
    Abstract:

    In this study, the effect of traverse speed on Abrasive Waterjet Machining (AWJM) of Inconel 718 nickel-based superalloy was experimentally investigated. In the experiments, six different traverse speeds of 80, 130, 180, 230, 280, and 330 mm/min were employed. Following the tests, the surface roughness of the machined job, the kerf taper ratio, and kerf wideness were measured. The characteristics of machined surface were also investigated using scanning electron microscope (SEM) and atomic force microscope (AFM). As a consequence, it is observed that the surface roughness and kerf taper ratio tended to increase with traverse speed, while kerf wideness decreased.

  • a study on surface roughness in Abrasive Waterjet Machining process using artificial neural networks and regression analysis method
    Journal of Materials Processing Technology, 2008
    Co-Authors: Ulas Caydas, Ahmet Hascalik
    Abstract:

    In the present study, artificial neural network (ANN) and regression model were developed to predict surface roughness in Abrasive Waterjet Machining (AWJ) process. In the development of predictive models, Machining parameters of traverse speed, Waterjet pressure, standoff distance, Abrasive grit size and Abrasive flow rate were considered as model variables. For this purpose, Taguchi's design of experiments was carried out in order to collect surface roughness values. A feed forward neural network based on back propagation was made up of 13 input neurons, 22 hidden neurons and one output neuron. The 13 sets of data were randomly selected from orthogonal array for training and residuals were used to check the performance. Analysis of variance (ANOVA) and F-test were used to check the validity of regression model and to determine the significant parameter affecting the surface roughness. The statistical analysis showed that the Waterjet pressure was an utmost parameter on surface roughness. The microstructures of machined surfaces were also studied by scanning electron microscopy (SEM). The SEM investigations revealed that AWJ Machining produced three distinct zones along the cut surface of AA 7075 aluminium alloy and surface striations and waviness were increased significantly with jet pressure.

  • effect of traverse speed on Abrasive Waterjet Machining of ti 6al 4v alloy
    Materials & Design, 2007
    Co-Authors: Ahmet Hascalik, Ulas Caydas, Hakan Gurun
    Abstract:

    Abstract In the presented study, Ti–6Al–4V alloy, known as one of the difficult-to-machine materials using conventional Machining processes, was machined under varying traverse speeds of 60, 80, 120, 150, 200, and 250 mm/min by Abrasive Waterjet (AWJ) Machining. After Machining, the profiles of machined surfaces, kerf geometries and microstructural features of the machined surfaces were examined using surface profilometry and scanning electron microscopy (SEM). The experimental results indicate that the traverse speed of the jet is a significant parameter on the surface morphology, and the widths and features of different regions formed in the cutting surface change according to the traverse speed. It was also observed that the kerf taper ratio and surface roughness increase with increasing traverse speed in chosen conditions.

  • Effect of traverse speed on Abrasive Waterjet Machining of Ti–6Al–4V alloy
    Materials & Design, 2006
    Co-Authors: Ahmet Hascalik, Ulas Caydas, Hakan Gurun
    Abstract:

    Abstract In the presented study, Ti–6Al–4V alloy, known as one of the difficult-to-machine materials using conventional Machining processes, was machined under varying traverse speeds of 60, 80, 120, 150, 200, and 250 mm/min by Abrasive Waterjet (AWJ) Machining. After Machining, the profiles of machined surfaces, kerf geometries and microstructural features of the machined surfaces were examined using surface profilometry and scanning electron microscopy (SEM). The experimental results indicate that the traverse speed of the jet is a significant parameter on the surface morphology, and the widths and features of different regions formed in the cutting surface change according to the traverse speed. It was also observed that the kerf taper ratio and surface roughness increase with increasing traverse speed in chosen conditions.