Transactions of Nanjing University of Aeronautics & Astronautics
Chip Formation Mechanism of Deep-Hole Gun Drilling of Ti6Al4V Titanium Alloy
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Abstract:
During the process of deep-hole gun drilling, the shape of the chip is a significant factor affecting the final quality. The relationship between chip forming mechanism and process parameters has always been a complicated problem in deep-hole drilling. This paper investigates Ti6Al4V titanium alloy to address this issue. First, the four processes and influencing factors of forming spiral chips are analyzed theoretically. Second, the fracture mechanism of chips in drilling Ti6Al4V titanium alloy is analyzed by scanning electron microscopy. Finally, the influences of cutting speed, feed rate and coolant oil pressure on chip shape are analyzed through drilling experiments and fluid simulation. The relationship between chip compression ratio and surface roughness is obtained through chip thickness measurement. This research can provide a guide for optimizing parameters of deep-hole gun drilling on Ti6Al4V titanium alloy.
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Project Supported:
We has been engaged in the research on the technology of deep-hole gun drilling for a long time. Through research, it was found that the gun drilling is completed once, unlike the twist drilling, there is no “drill-retract” machining process. The chip formation and fracture are only related to the workpiece material, tool size and process parameters. Therefore, this study focuses on the following issues:
Clc Number:
TG713;TH161
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