Research On Pulse Power For Array Micro-jet Holes Machining

With the rapid development of advanced manufacturing technology, intensification of competition in manufacturing market, and the miniaturization and precision of products worldwide ,requirement of products'precision become more and more higher.and mang countries attach more and more importance to micro EDM.In zhe field of biotechnology, Biological engineering, textile ink-jet printing, metal deposition, microstructure manufacturing, electronics manufacturing, network connection, pharmaceutical and display manufacturing,the precision of micro-arrays holes in accurate micro jet parts,become the restriction of their development. Micro EDM technology as a non-contact processing method, whose processing stress is small, processing precision is high, has a great advantage in the processing of micro-arrays holes.Micro-energy pulse power as an important component of Micro-EDM machine has an important position in the processing. In this paper, after reading a lot of literature, based on the analysis of the previous Micro EDM power's characteristics, find that a single power supply mode, and micro-pulse power whose energy range is small can not meet the need of micro-arrays holes processing. Therefore the research of a micro-energy pulse power with multi-mode and a large range of energy options is important in the research of micro-arrays holes processing.In this paper, design a multi-mode micro-energy pulse power, in which the control of main oscillator circuitis is based on a microprocessor and complex programmable logic device (CPLD), the power amplifier set RC, controlled resistors, controlled capacitors, and other several discharge machining mode in one. Through the design of hardware, programming and related testing, complete the production of micro-energy pulse power supply. In the processing, the micro-energy pulse power can achieve a wide range of optional in energy by , changing the power modes, the open circuit voltage, resistance, capacitance, duty cycle and other electrical parameters, to ensure that the pulse power supply can meet the need of practical processing.Then apply the micro-energy pulse power debugged to the experiment,and work on the electrical parameters with regard to electrode grinding and micro-hole machining respectively. Afterwards, analyze the effect of diffent electrical parameters on processing,and choose a better set of parameters to verify.The experimental result is consistent with expectation, indicating that the micro-energy pulse power can achieve goals of electrode grinding and micro-hole machining.According to the preliminary exploration of the law of the electrical parameters, choose a set of electrical parameters suit for electrode grinding and micro-hole machining respectively, and apply them to the processing of array of holes of micro jet parts in printer.In the processing of electrode grinding, find that this micro-energy pulse power can process micro-electrode axises,with its diameter of about 39.5μm, diameter deviation in 1μm, length of 1050μm, aspect ratio of more than 26; and can process 2×128 array of holes with deviation of 2μm in diameter stably in the processing of micro-hole arrays.