압전구동기를 이용한 정밀 가공용 초음파 진동장치 설계

• 영문명: Design of Ultrasonic Vibration Device using PZT Actuator for Precision Laser Machining
• 발행기관: 한국레이저가공학회
• 저자명: 김우진(W. J. Kim) Lu Fei, 조성학(S. H. Cho) 박종권(J. K. Park) 이문구(M. G. Lee)
• 간행물 정보: 『한국레이저가공학회지』한국레이저가공학회지 제14권 제2호, 8~12쪽, 전체 5쪽
• 주제분류: 공학 > 기계공학
• 파일형태: PDF
• 발행일자: 2011.06.30

영문 초록

As the aged population grows around the world, many medical instruments and devices have been developed recently. Among the devices, a drug delivery stent is a medical device which requires precision machining. Conventional drug delivery stent has problems of residual polymer and decoating because the drug is coated on the surface of stent with the polymer. If the drug is impregnated in micro hole array on the surface of the stent, the problem can be solved. Micro sized holes are generally fabricated by laser machining; however, the fabricated holes do not have an enough aspect ratio to contain the drug or a good surface finish to deliver it to blood vessel tissue. To overcome these problems, we propose a vibration-assisted machining mechanism with PZT (Piezoelectric Transducers) for the fabrication of micro sized holes. If the mechanism vibrates the eyepiece of the laser machining head, the laser spot on the workpiece will vibrate vertically because objective lens in the eyepiece shakes by the mechanism’s vibration. According to the former researches, the vibrating frequency over 20㎑ and amplitude over 500nm are preferable. The vibration mechanism has cylindrical guide, hollowed PZT and supports. In the cylinder, the eyepiece is mounted. The cylindrical guide has upper and low plates and side wall. The shape of plates and side wall are designed to have high resonating frequency and large amplitude of motion. The PZT also is selected to have high actuating force and high speed of motion. The support has symmetrical and rigid characteristics.

목차

Abstract

1. 서론

2. 장치의 구성

3. 유한요소해석

4. 실험장치구성

5. 실험결과

6. 결론

후기

참고문헌

키워드

Ultrasonic vibration PZT actuator Laser machining Precision device FEA 초음파 진동 압전소자구동기 레이저 가공 정밀 장치 유한요소해석