Optimization of Electro Discharge Machining Parameters on Mg / SiC P-Metal Matrix Composites by Response Surface Methodology
Metal Matrix Composites (MMCs) are present engineer ing materials which have more advantages when compare to conventional materials. Magnesium based MMCs among the MMCs have become an important resear ch subject because of their low density and high stren gth/weight ratio in recent years. The aim of this s tudy is to find out the most influence factors of the electro-disch arge machining (EDM) process parameters. The specim ens were used as Mg/SiCp metal matrix composites. The specim ens were prepared by the powder metallurgy techniqu es. Brass tool with diameter of 10mm was used to machin e the specimens. Experiments were conducted under d iff rent conditions of pulse on time (Ton), pulse off time ( Toff), current (I). The output responses measured w re material removal rate (MRR) and Tool wear rate (TWR). Mathem atical models are proposed for the above responses using response surface methodology (RSM). The analysis of variance (ANOVA) was carried out to study the effe ct of process parameters on process performance.
Investigation and Optimization of Materiel Removal Rate For Wire Cut Electro Discharge Machining In EN5 Steel Using Response Surface Methodology.
EN5 is medium strength mild steel so it is widely used in various machineries parts like shafts, racks, pinions, studs, bolts, nuts, rollers etc. Wire Electric Discharge Machine (WEDM) seems a good option for machining the complicated shapes on medium strength steel. this paper, identify the effects of various process parameters of WEDM such as pulse on (Ton) ,pulse off (Toff), peak current (Ip), servo voltage (Sv) for analysis the material removal rate (MRR) while machining EN5 mild steel material. Central Composite Design is used to plan and design of experts. The output response variable being material removal rate will be measured for all the number of experiments conducted. As the lowest value of MRR indicates the poor cutting rate, the optimum parameter level combination would be analyzed which gives desired material removal rate. These optimized values of various parameters would then be used in performing machining operation in order to obtain desirable outputs.
American Insurgents, American Patriots: The Revolution of the People
This is a story of rumour, charity, vengeance, and restraint. "American Insurgents, American Patriots" reminds us that revolutions are violent events. They provoke passion and rage, a willingness to use violence to achieve political ends, a deep sense of betrayal, and a strong religious conviction that God expects an oppressed people to defend their rights. The American Revolution was no exception. A few celebrated figures in the Continental Congress do not make for a revolution. It requires tens of thousands of ordinary men and women willing to sacrifice, kill, and be killed. Breen not only tells the history of these ordinary Americans but, drawing upon a wealth of rarely seen documents, restores their primacy to America's road to independence. Mobilizing two years before the Declaration of Independence, American insurgents in all thirteen colonies concluded that resistance to British oppression required organized violence against the state. They channeled popular rage through elected committees of safety and observation, which before 1776 were the heart of American resistance. "American Insurgents, American Patriots" is the stunning account of their insurgency, without which there would have been no independent republic as we know it.