[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 28, No. 4, pp.238-245

ISSN: 2508-5107 (Online)

Print publication date 15 Aug 2019

Received 20 Jul 2019 Revised 08 Aug 2019 Accepted 11 Aug 2019

DOI: https://doi.org/10.7735/ksmte.2019.28.4.238

쇼크옵소버용 피스톤로드의 열처리 NDE탐상을 위한 자동화시스템 개발

임광희^a^{, *}

; 이형호^b ; 김선규^c ; 정종안^d ; 조영태^e ; 우용득^a ; 장계림^f ; 곽영환^g ; 양인영^g

Development of Automatic Ultrasonic System for NDE Characterization on the Heat Treatment in Piston Rods for a Use of Shock Absorbers

Kwang-Hee Im^a^{, *}

; Hyung-Ho Lee^b ; Sun-Kyu Kim^c ; Jong-An Jung^d ; Young-Tae Cho^e ; Yong-Deuck Woo^a ; Gue-Lin Zhang^f ; Young-Hwan Kwak^g ; In-Young Yang^g

aDepartment of Automotive Eng., Woosuk University 443, Samrae-ro, Wanju-kun, Jeonbuk-do, 55338, Korea
bResearch Center, Taesan ENG Co., 126, Seogam-ro 3-gil, Iksan, Jeonbuk-do, 55338, Korea
cDivision of Mech. System Eng., Chonbuk Natl. University, 567, Backjedae-ro Duckjin-gu, Jeonju, Jeonbuk-do, 54896, Korea
dDept. of Mechanical and Automotive Engineering, Songwon University, 73, Songarm-ro, Nam-gu, Gwangju 33209, Korea
eDept. of Manufacturing Design Eng., Jeonju University, 303, Chunjam-ro, Wansan-gu, Jeonju, Jeonbuk-do, 55069, Korea
fResearch Center, HiMC, Co. Ltd. 817, Palbuk-dong 2-Ga, Iksan, Jeonbuk-do, 54842, Korea
gDepartment of Mechanical System Eng., Chosun University Graduate School, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Korea

Correspondence to: ^*Tel.: +82-63-290-1473 Fax: +82-63-290-1681 E-mail address: khim@woosuk.ac.kr (Kwang-Hee Im).

Abstract

In general, piston rods can absorb both the shock and vibration to maintain the stability of moving automotive wheels; a high-frequency heat treatment is performed to guarantee their quality. Appropriate nondestructive techniques are required to monitor the degrees of this treatment. It is possible to quantitatively predict the beam profile behavior and the degree of heat treatment for the outer diameter of the piston rods by measuring the ultrasonic behavior of the rods through an automated ultrasonic system.

The results of this study demonstrated that the specimens underwent this treatment had a longer time-of-flight (TOF) than the specimens without it, indicating that it is possible to lower the surface ultrasound velocity. It was determined that the shock observer piston rod surface particles become both enlarged and oxidized owing to this treatment and that the surface wave velocity is affected by thermal oxidation.

Keywords:

Ultrasonic wave, Piston rods, Surface ultrasonic wave, Heated treatment, Automatic system

Acknowledgments

본 과제는 2019년 한국산업단지공단(Human Resources Development Service of Korea (HRD Korea))의 생산기술사업지원사업인 이전기술사업에 의해 지원을 받았음.

본 과제 관련하여 기술이전부분인 중소기업청과 우석대학교 LINC의 결과물을 일부활용하였음.

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