{'fraction_non_alphanumeric': 0.014255167498218105, 'fraction_numerical': 0.0, 'mean_word_length': 4.7073170731707314, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A Study of the Chip Formation and Chip Removal in Dry Drilling of Aluminum Cast Alloy

In order to realize dry drilling of aluminum cast alloy, a fundamental investigation of the chip formation and the chip removal was conducted by observing the cutting area directly. The main purpose of this study is to clarify the process of chip formation and the motion of the chips within the flute. Visualization of the cutting area in the drilling process was realized by adopting a special experimental method. The process of chip formation was observed and recorded using a high speed camera. The chip formation and chip removal were discussed under various cutting conditions, including the application of air blow drilling, in which the compressed air was supplied through the oil hole, and MQL (Minimum Quantity Lubricant) drilling technique, in which the oil mist was supplied through the oil hole. In this study, the process of chip formation and the motion of the chips within the flute were observed and clarified by visible drilling tests. Moreover, it was also clarified that the chip removal was improved greatly in air blow and MQL drilling. Compared with the dry drilling, the curl size of the chips decreases greatly in air blow and MQL drilling. Furthermore, the decrease of the curl size was more remarkable in MQL drilling than in air blow drilling due to the lubricant effect of the oil mist.