scholarly journals Electrical Discharge Drilling of Metal Matrix Composites with a Hollow Hexagonal Electrode

2018 ◽  
Vol 27 (5) ◽  
pp. 096369351802700 ◽  
Author(s):  
Zhibiao Lin ◽  
Zhongning Guo ◽  
Shuzhen Jiang ◽  
Guixian Liu ◽  
Jiangwen Liu
Keyword(s):  
Duty Cycle ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Rotation Speed ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Work Piece ◽  
Matrix Composites ◽  
Peak Current ◽  
Hollow Electrode

Aimed at the problems of the conventional electrical discharge machining of particle-reinforced aluminum matrix composites (PR-AMCs), a novel hollow hexagonal electrode has been employed and the influence of the electrode structure on the MRR has been investigated. In this study, 3-D model of the working medium fluid flow field has been established to study the structure effect of the hexagonal electrode. And a lot of single factor comparison experiments are carried out between the hexagonal hollow electrode and round hollow electrode. The effects of peak current, duty cycle, machining rotation speed and pulse width on the MRR of work-piece has been studied respectively. The Response Surface Method (RSM) is adopted to imitate the law of machining surface of the hexagonal hollow electrode. The theoretical and experimental results both show that the MRR of the work-piece can be improved remarkably by using a hexagonal hollow electrode. Moreover, according to the RSM, the maximum MRR of machining AMCs of the hexagonal hollow electrode is 225mm3/min, while the optimum combination of parameters that the peak current (12A), the duty cycle (0.75), machining rotation speed (900 r/min) and flushing pressure (1.5MPa) is exerted.

scholarly journals Electrical Discharge Machining of Metal Matrix Composites with a High Speed Non-Round Electrode

2016 ◽  
Vol 25 (6) ◽  
pp. 096369351602500 ◽  
Author(s):  
J.W. Liu ◽  
Y.J. Xiao ◽  
Z.N. Guo ◽  
S.J. Wang ◽  
T.M. Yue ◽  
...  
Keyword(s):  
Metal Matrix Composites ◽  
Pulse Duration ◽  
Duty Cycle ◽  
Metal Matrix ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Rotation Speed ◽  
Tool Electrode ◽  
Matrix Composites ◽  
Electrode Rotation

An electrical discharge machining process with a high electrode rotation speed (EDM-HS) has been developed to solve the problems of the conventional EDM process in machining metal matrix composites (MMCs). The EDM-HS process employs a non-round tool electrode. The experiment results showed that the materials removal rate (MRR) of the workpiece can be improved significantly by employing a non-round tool electrode. The relationship between the pulse duration, machining current, duty cycle, the rotation speed of the tool electrode and the MRR has been studied respectively. And the machining mechanism of this EDM-HS process has been analyzed both theoretically and experimentally. The results showed that the non-round electrode can enlarge the machining gap and with a high electrode rotation speed, the machined debris can be discharge out of the machining area effectively and hence a stable machining condition can be obtained. As a result, a higher MRR can be achieved. Moreover, an orthogonal analysis has been utilized to study the relative importance of the machining parameters on MRR. It was found that to obtain the highest MRR, the electrode rotation speed was the most influential factor among the duty cycle, machining current, pulse duration and electrode rotation speed. This outcome supports that it is feasible to use this novel method to machining particulate reinforced MMCs, where a higher MRR can be achieved.

Research on Grinding of Silicon Particles Reinforced Aluminum Matrix Composites with High Volume Fraction

2014 ◽  
Vol 1017 ◽  
pp. 98-103
Author(s):  
Fei Hu Zhang ◽  
Kai Wang ◽  
Peng Qiang Fu ◽  
Meng Nan Wu
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
High Volume ◽  
Grinding Force ◽  
Aluminum Matrix Composites ◽  
Work Piece ◽  
Matrix Composites ◽  
Silicon Particles

With silicon particles reinforced aluminum matrix composites with high volume fraction becoming a new hotspot on research and application in the aerospace materials and electronic packaging materials, the machinability of this material needs to be explored. This paper reports research results obtained from the surface grinding experiment of silicon particles reinforced aluminum matrix composites using black silicon carbide wheel, green silicon carbide wheel, white fused alumina wheel and chromium alumina wheel. The issues discussed are grinding force, surface roughness, the comparison of different grinding wheels, the micro-morphology of the work piece. The results showed that the grinding force was related with the grinding depth and the grinding wheel material, the grinding force was increasing as the grinding depth growing. The surface roughness was between 0.29μm and 0.48μm using the silicon carbide wheel. The surface of the work piece had concaves caused by silicon particles shedding and grooves caused by the grains observed by the SEM and CLSM.

An Orthogonal Experimental Analysis of Electrical Discharge Machining of Particle Reinforced Metal Matrix Composites with Concavo-Convex Electrode

2011 ◽  
Vol 314-316 ◽  
pp. 890-893
Author(s):  
Jiang Wen Liu ◽  
Guang Xue Chen ◽  
Tai Man Yue ◽  
Zhong Ning Guo ◽  
Zi Yao Wan
Keyword(s):  
Material Removal Rate ◽  
Duty Cycle ◽  
Experimental Analysis ◽  
Metal Matrix ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Matrix Composites ◽  
Particulate Reinforced

A new concavo-convex electrode has been designed and employed and it was reported that electrical discharge machining (EDM) of particulate reinforced metal matrix composites with this kind of new electrode can accelerate the debris discharge during machining so that it has a higher material removal rate (MRR) compared to the case where a normal electrode was employed. Since there are many factors that can affect the MRR in the EDM process with the concavo-convex electrode, in order to determine which is the most important factor and to optimize the machining parameters, the relative importance of the various cutting parameters on material removal rate was established using an orthogonal experimental analysis in this study. The results of the analysis suggest that to achieve a high MRR for particulate reinforced aluminum 6061 with 10-vol% Al2O3 (10ALO) or 20vol% Al2O3 (20ALO) using a concavo-convex electrode, the duty cycle is the most influential factor among current, pulse duration and duty cycle.

Using explosive energy for processing aluminum matrix composites

2000 ◽  
Vol 10 (PR9) ◽  
pp. Pr9-119-Pr9-122
Author(s):  
V. Popov ◽  
V. Gulbin ◽  
E. Sungurov
Keyword(s):  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Explosive Energy

Effect of Titanium Carbide Particles on Mechanical Properties of Aluminum Matrix Composites

2017 ◽  
Vol 5 (2) ◽  
pp. 20-30
Author(s):  
Zaman Khalil Ibrahim
Keyword(s):  
Mechanical Properties ◽  
Titanium Carbide ◽  
Compression Strength ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Carbide Particles ◽  
Properties Of Composites

In this research aluminum matrix composites (AMCs) was reinforced by titanium carbide (TiC) particles and was produced. Powder metallurgy technique (PM) has been used to fabricate AMCs reinforced with various amounts (0%, 4%, 8%, 12%, 16% and 20% volume fraction) of TiC particles to study the effect of different volume fractions on mechanical properties of the Al-TiC composites. Measurements of compression strength and hardness showed that mechanical properties of composites increased with an increase in volume fraction of TiC Particles. Al-20 % vol. TiC composites exhibited the best properties with hardness value (97HRB) and compression strength value (275Mpa).

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