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Study on Chip Shapes and Drilling Forces of Low Frequency Vibration Drilling of TC4 Titanium Alloy.

Authors :
ZHAO Ting
XIAO Jiming
FAN Simin
YANG Zhenchao
YANG Fujie
Source :
China Mechanical Engineering; 10/10/2020, Vol. 31 Issue 19, p2276-2282, 7p
Publication Year :
2020

Abstract

In order to study the chip shapes and the influence law of drilling parameters and vibration parameters on drilling forces (thrust force and torque) during low frequency vibration drilling of TC4 titanium alloy. Based on a self-developed low-frequency vibrating tool holder, low-frequency vibration drilling tests of titanium alloy were carried out by single factor method and orthogonal test method respectively. Chip shapes and drilling forces under different drilling conditions were analyzed. Empirical formulas of thrust force and torque were established. The influence factors of drilling forces were analyzed by visual analyses and variance analyses. Results show that when TC4 titanium alloy is drilled in low frequency vibration, the ratio of amplitude and feed is close to the critical chip breaking value of 0.81, the chip breaking is reliable, and the chip discharging is smooth. The instantaneous drilling force of low frequency vibration presents regular sine wave, and the dynamic component of drilling force is much larger than the ordinary drilling. The thrust force and torque mean may be reduced by 10%~15% and 15%~20% respectively than that of the ordinary drilling. The feed rate has the most significant influences on the drilling forces, the amplitude takes second place, the drilling speed has the least influence. The established vibration drilling experience model error is kept within 10%, which may accurately predict the drilling forces within the selected parameters of the test systems. [ABSTRACT FROM AUTHOR]

Details

Language :
Chinese
ISSN :
1004132X
Volume :
31
Issue :
19
Database :
Complementary Index
Journal :
China Mechanical Engineering
Publication Type :
Academic Journal
Accession number :
146667553
Full Text :
https://doi.org/10.3969/j.issn.1004-132X.2020.19.002