| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 106 === The core technology of 3D sand mold printing is Piezoelectric inkjet head. The inkjet head selectively prints droplets onto the building platform by controlling the waveform. The waveform parameters influence the droplet properties which affect the dimension and quality of the printed object. Therefore, this study researches properties of piezo print head, including waveform parameters, droplet properties and the size of the printed object.
This study uses the high-speed camera to observe the ink-jet type and the appropriate ink-jet parameters and establish a 3D sand mold printing system to discuss the printing quality of influencing factors. As a result, the voltage is higher, the deviation value of printed object is bigger and the deviation is always caused by layer of printing beginning. In addition, the more inkjet quantity, the higher strength and the better formability it will be, but it causes the more deviation of dimension. So it’s hard to balance those influencing factors. Therefore, this study provides a printing strategy which is use gray level printing and the experimental results of testing. The strategy uses the lower deviation of waveform parameters at layer of beginning. After that, increase inkjet quantity to get the higher strength. Finally, this work achieves the deviation of dimension less than 10% under the 300kgf strength.
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