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Hard-to-machine alloys are commonly used for industrial applications in the aeronautical, nuclear and automotive sectors, where the materials must have excellent resistance to corrosion and oxidation, high temperature resistance and high mechanical strength. In this present study the influence of different parameters of the electrical discharge machining process on surface roughness, electrode wear and material removal rate have been studied. Regression techniques are employed to model arithmetic mean deviation Ra (μm), peak count Pc (1/cm), material removal rate MRR (mm3/min) and electrode wear EW (%). All these parameters have been studied in terms of current intensity supplied by the generator of the electrical discharge machine I (A), pulse time ti (μs), duty cycle η and open-circuit voltage U (V). This modelling allows us to obtain mathematical data and models to predict that the most influential factor in MRR and Ra is the current intensity and in the case of EW and Pc is the pulse time. 相似文献
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B. H. Yan C. C. Wang W. D. Liu F. Y. Huang 《The International Journal of Advanced Manufacturing Technology》2000,16(5):322-333
This work optimises the cutting of Al2O3/6061Al composite using rotary electro-discharging machining (EDM) with a disklike electrode by using Taguchi methodology.
The Taguchi method is used to formulate the experimental layout, to analyse the effect of each EDM parameter on the machining
characteristics, and to predict the optimal choice for each EDM parameter. Four observed values, MRR, EWR, REWR, and SR, are
used to verify this optimisation of the machining technique. In addition, six independent parameters are chosen as variables
in evaluating the Taguchi method and are categorised into two groups:
1. Electrical parameters, e.g. polarity, peak current, pulse duration, and powder supply voltage.
2. Non-electrical parameters, e.g. circumferential speed of electrode, reciprocating speed. The analysis of the Taguchi method
reveals that, in general, the electrical group more significantly affects the machining characteristics than the non-electrical
group. Also derived herein are semi-empirical equation that contain all of the machining characteristics. Experimental results
are presented to illustrate the proposed approach. 相似文献
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A. Noorul Haq P. Marimuthu R. Jeyapaul 《The International Journal of Advanced Manufacturing Technology》2008,37(3-4):250-255
This paper presents a new approach for the optimization of drilling parameters on drilling Al/SiC metal matrix composite with
multiple responses based on orthogonal array with grey relational analysis. Experiments are conducted on LM25-based aluminium
alloy reinforced with green bonded silicon carbide of size 25 μm (10% volume fraction). Drilling tests are carried out using
TiN coated HSS twist drills of 10 mm diameter under dry condition. In this study, drilling parameters namely cutting speed,
feed and point angle are optimized with the considerations of multi responses such as surface roughness, cutting force and
torque. A grey relational grade is obtained from the grey analysis. Based on the grey relational grade, optimum levels of
parameters have been identified and significant contribution of parameters is determined by ANOVA. Confirmation test is conducted
to validate the test result. Experimental results have shown that the responses in drilling process can be improved effectively
through the new approach. 相似文献
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Soraya Plaza Jose A. Sanchez Endika Perez Ruben Gil Borja Izquierdo Naiara Ortega Iñigo Pombo 《Precision Engineering》2014
There is a growing interest in the machining of micro-holes with high aspect-ratio in difficult-to-machine alloys for the aerospace industry. Processes based on electro discharge machining (EDM) and developed for the manufacture of both micro-electrode and micro-hole are actually used, but most of them involve micro-EDM machines. In this work, the influence of EDM parameters on material removal rate, electrode wear, machining time and micro-hole quality when machining Ti6Al4V is studied. Due to an inefficient removal of debris when increasing hole depth, a new strategy based on the use of helical-shaped electrodes has been proposed. The influence of helix angle and flute depth with respect to process performance has been addressed. Main results include 37% reduction in machining times (hole diameter 800 μm) when using electrode helix angle of 45° and flute-depth of 50 μm, and an additional 19% with flute-depth of 150 μm. Holes of 661 μm diameter and as much as 6.81 mm depth, which yields in aspect ratio of 10:1, have successfully been machined in Ti6Al4V. 相似文献