Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : April 22, 2024 - April 23, 2024
Miniature screws are a standard for screws with a nominal diameter of 0.3 mm to 1.4 mm, and are used in watches, optical equipment, electrical equipment, measuring equipment, etc. Machining female threads with a fluteless tap is a plastic working process that does not produce chips and has a long tool life, but it is often used for small diameter machining and is prone to tool breakage. The authors attempted to reduce the machining torque by using ultrasonic vibration for machining internal threads of miniature screws. Two types of ultrasonic vibrations, 28kHz and 40kHz, were applied to investigate the relationship between vibration frequency and machining torque. The tap used this time is a fluteless tap with a nominal diameter of 0.5 mm, which is the smallest diameter tap available on the market. Experimental conditions were investigated with and without tapping paste. As a result, the effect of ultrasonic vibration was higher when tapping paste was used.
