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.

scholarly journals Investigation of Significant Parameters during Abrasive Waterjet Turning

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4389
Author(s):  
Adam Štefek ◽  
Jan Raška ◽  
Libor M. Hlaváč ◽  
Sławomir Spadło
Keyword(s):  
Relative Position ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Impact Angle ◽  
Abrasive Waterjet ◽  
Turning Process ◽  
Traditional Technologies ◽  
Key Parameter

This paper presents an investigation of abrasive waterjet turning (AWJT). The purpose of the article was to investigate significant parameters of the turning process and to evaluate their impact on the turning product. The influence of the traverse speed, the rotational speed, and the relative position of the jet to the specimen (lateral jet shift) were investigated. Based on the previous research done in this field, the multi-pass tangential turning method was selected. Rotational speed does not seem to have a significant impact on the AWJ turning process. However, the relative position of the jet is a key parameter for improving the efficiency of the process. Increasing the lateral jet shift causes the volume of the material removed to increase until the optimal impact angle is reached. These findings need to be extended in order to adjust AWJT. Without these improvements, a comparison of jet to traditional technologies is inappropriate.

A Strategy for Generating Contoured Surface With Abrasive Waterjet Milling on Ductile Materials

2012 ◽  
Author(s):  
R. Srikanth ◽  
N. Ramesh Babu
Keyword(s):  
Control Strategy ◽  
Control Strategies ◽  
Dimensional Accuracy ◽  
Impact Angle ◽  
Surface Generation ◽  
Abrasive Waterjet ◽  
Ductile Materials ◽  
Stainless Steel 304 ◽  
Waterjet Machining ◽  
Milled Surface

Surface generation by abrasive waterjet milling is one of the emerging applications of waterjet machining for processing of difficult to cut materials like super alloys, titanium alloys and hardened tool steels. The key aspect lies in the identification of certain important parameters that influence the kerf geometry and develop control strategies to produce easily reproducible kerfs and combine them together to produce a contoured surface. In this work, an attempt is made to devise control strategies, based on certain kinematic operating parameters like traverse rate, stand-off distance and impact angle of jet on the material, to generate a series of reproducible kerfs and to merge them together to produce a contoured surface. This is achieved by first discretely milling the surface into a series of kerfs separated by thin unmachined region and then gradually increasing the depth of these kerfs to match the requirements of the contoured surface with multiple traversal of jet. Subsequently these kerfs are merged by removing the regions separating them. The proposed control strategy is demonstrated by milling contoured surface on stainless steel 304 alloy. Finally, the efficiency of the proposed control strategy for producing contoured surface is assessed in terms of dimensional accuracy achieved on the milled surface.

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.

MULTISTAGE ROCKET FLIGHT SIMULATION

2019 ◽  
pp. 105-107
Author(s):  
A. S. Busygin ◽  
А. V. Shumov
Keyword(s):  
State Vector ◽  
Center Of Mass ◽  
Flight Simulation ◽  
Continuous Change ◽  
Information Tools ◽  
The Earth ◽  
Proposed Model ◽  
Piecewise Continuous ◽  
The Moment ◽  
Simulated Object

The paper considers a method for simulating the flight of a multistage rocket in Matlab using Simulink software for control and guidance. The model takes into account the anisotropy of the gravity of the Earth, changes in the pressure and density of the atmosphere, piecewise continuous change of the center of mass and the moment of inertia of the rocket during the flight. Also, the proposed model allows you to work out various targeting options using both onboard and ground‑based information tools, to load information from the ground‑based radar, with imitation of «non‑ideality» of incoming target designations as a result of changes in the accuracy of determining coordinates and speeds, as well as signal fluctuations. It is stipulated that the design is variable not only by the number of steps, but also by their types. The calculations are implemented in a matrix form, which allows parallel operations in each step of processing a multidimensional state vector of the simulated object.

scholarly journals Impacts of Traverse Speed and Material Thickness on Abrasive Waterjet Contour Cutting of Austenitic Stainless Steel AISI 304L

2021 ◽  
Vol 11 (11) ◽  
pp. 4925
Author(s):  
Jennifer Milaor Llanto ◽  
Majid Tolouei-Rad ◽  
Ana Vafadar ◽  
Muhammad Aamir
Keyword(s):  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Traverse Speed ◽  
Abrasive Waterjet ◽  
Taper Angle ◽  
Material Thickness ◽  
Abrasive Waterjet Machining ◽  
Kerf Taper ◽  
Waterjet Machining

Abrasive water jet machining is a proficient alternative for cutting difficult-to-machine materials with complex geometries, such as austenitic stainless steel 304L (AISI304L). However, due to differences in machining responses for varied material conditions, the abrasive waterjet machining experiences challenges including kerf geometric inaccuracy and low material removal rate. In this study, an abrasive waterjet machining is employed to perform contour cutting of different profiles to investigate the impacts of traverse speed and material thickness in achieving lower kerf taper angle and higher material removal rate. Based on experimental investigation, a trend of decreasing the level of traverse speed and material thickness that results in minimum kerf taper angle values of 0.825° for machining curvature profile and 0.916° for line profiles has been observed. In addition, higher traverse speed and material thickness achieved higher material removal rate in cutting different curvature radii and lengths in line profiles with obtained values of 769.50 mm3/min and 751.5 mm3/min, accordingly. The analysis of variance revealed that material thickness had a significant impact on kerf taper angle and material removal rate, contributing within the range of 69–91% and 62–69%, respectively. In contrast, traverse speed was the least factor measuring within the range of 5–18% for kerf taper angle and 27–36% for material removal rate.

scholarly journals Experimental Exploration of Hybrid Metal Matrix Composite using Abrasive Water Jet Machining

2019 ◽  
Vol 9 (2) ◽  
pp. 1872-1875
Author(s):  
Barath M ◽  
◽  
Rajesh S ◽  
Duraimurugan P ◽  
◽  
...  
Keyword(s):  
Surface Roughness ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Water Pressure ◽  
Traverse Speed ◽  
Abrasive Waterjet ◽  
Force Microscopy ◽  
Business Applications ◽  
Hybrid Metal Matrix Composite

The abrasive mixed waterjet was with success utilized to chop several materials together with steel, metal and glass for a spread of business applications. This work focuses on surface roughness of hybrid metal matrix composite (AA6061, Al2O3, B4C). Machining was applied by AWJM (Abrasive Waterjet Cutting) at completely different parameters Water pressure, Traverse speed, Abrasive flow and stand-off distance. The reinforced composite was analyzed exploitation FE SEM (Field Emission Scanning lepton Microscope) and distribution of reinforced was studied by AFM (Atomic Force Microscopy). For optimum results surface roughness was calculated.

scholarly journals Experimental Analysis and Soft Computing Modeling of Abrasive Waterjet Milling of Steel Workpieces

2020 ◽  
Vol 318 ◽  
pp. 01031
Author(s):  
Panagiotis Karmiris-Obratański ◽  
Nikolaos E. Karkalos ◽  
Anastasios Tzotzis ◽  
Panagiotis Kyratsis ◽  
Angelos P. Markopoulos
Keyword(s):  
Soft Computing ◽  
Process Parameters ◽  
High Efficiency ◽  
Traverse Speed ◽  
Abrasive Waterjet ◽  
Machining Processes ◽  
Metalworking Industry ◽  
Complex Features ◽  
Alternative Processes ◽  
Conventional Machining

Conventional machining processes such as turning, milling and drilling have long been prominent in the metalworking industry but alternative processes which do not require the use of a cutting tool in order to conduct material removal have also been proven to be sufficiently capable of achieving high efficiency in various cases. In particular, Abrasive Waterjet (AWJ) machining can be regarded as a rather appropriate choice for cutting operations, taking into consideration that it involves no heat affected zones, is able to process all material types and create a variety of complex features with success. In the present work, a comprehensive study on the effect of four process parameters, namely jet traverse speed, stand-off distance, abrasive mass flow rate and jet pressure on the width and depth of machined slots on a steel workpiece is conducted. The results are first analyzed with statistical methods in order to determine the effect and the relative importance of each parameter on the produced width and depth of the slots. Finally, these results are used to develop soft computing predictive models based on Artificial Neural Networks (ANN), which can efficiently relate the process parameters with its outcome.

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.

scholarly journals A New Multiparameter Model for Multiaxial Fatigue Life Prediction of Rubber Materials

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1194
Author(s):  
Rafael Tobajas ◽  
Daniel Elduque ◽  
Elena Ibarz ◽  
Carlos Javierre ◽  
Luis Gracia
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Experimental Testing ◽  
Experimental Tests ◽  
Relevant Information ◽  
Fatigue Tests ◽  
Multiaxial Fatigue ◽  
Fatigue Life Prediction ◽  
Proposed Model ◽  
Predicted Values

Most of the mechanical components manufactured in rubber materials experience fluctuating loads, which cause material fatigue, significantly reducing their life. Different models have been used to approach this problem. However, most of them just provide life prediction only valid for each of the specific studied material and type of specimen used for the experimental testing. This work focuses on the development of a new generalized model of multiaxial fatigue for rubber materials, introducing a multiparameter variable to improve fatigue life prediction by considering simultaneously relevant information concerning stresses, strains, and strain energies. The model is verified through its correlation with several published fatigue tests for different rubber materials. The proposed model has been compared with more than 20 different parameters used in the specialized literature, calculating the value of the R2 coefficient by comparing the predicted values of every model, with the experimental ones. The obtained results show a significant improvement in the fatigue life prediction. The proposed model does not aim to be a universal and definitive approach for elastomer fatigue, but it provides a reliable general tool that can be used for processing data obtained from experimental tests carried out under different conditions.

EXPERIMENTAL STUDY OF SURFACE ROUGHNESS AND TAPER ANGLE IN ABRASIVE WATER JET MACHINING OF 7075 ALUMINUM COMPOSITE USING RESPONSE SURFACE METHODOLOGY

2019 ◽  
Vol 27 (03) ◽  
pp. 1950112 ◽  
Author(s):  
A. SHANMUGAM ◽  
K. KRISHNAMURTHY ◽  
T. MOHANRAJ
Keyword(s):  
Surface Roughness ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Process Parameters ◽  
Water Pressure ◽  
Traverse Speed ◽  
Standoff Distance ◽  
Abrasive Waterjet ◽  
Machined Surface ◽  
Taper Angle

Surface roughness and taper angle of an abrasive waterjet machined surface of 7075 Aluminum metal matrix composite were deliberately studied. Response surface methodology design of experiments and analysis of variance were used to design the experiments and to identify the effect of process parameters on surface roughness and taper angle. The jet traverse speed and jet pressure were the most significant process parameters which influence the surface roughness and taper angle, respectively. Increasing the pressure and jet traverse speed results in increasing the surface roughness and taper angle. At the same time, decreasing the standoff distance and jet traverse speed possibly enhances both the responses. The optimal process parameters of 1[Formula: see text]mm as standoff distance, 192[Formula: see text]MPa as water pressure and 30[Formula: see text]mm[Formula: see text]min[Formula: see text] as jet traverse speed were identified to obtain the minimum value of surface roughness and taper angle. Based on the optimal parameters, the confirmation test was conducted. The mathematical equation was obtained from the experimental data using regression analysis; it was observed that the error was less than 5% of the experimentally measured values.

Sign in / Sign up

Export Citation Format

Share Document