[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 29, No. 2, pp.98-106

ISSN: 2508-5093 (Print) 2508-5107 (Online)

Print publication date 15 Apr 2020

Received 22 Feb 2020 Revised 10 Mar 2020 Accepted 10 Mar 2020

DOI: https://doi.org/10.7735/ksmte.2020.29.2.98

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

Kwang-Hee Im^a^{, *} ; Hyung-Ho Lee^b ; Sun-Kyu Kim^c ; Jong-An Jung^d ; Young-Tae Cho^e ; Yong-Deuck Woo^a

aDepartment of Automotive Eng., Woosuk University
bResearch Center, Taesan ENG Co.
cDivision of Mech. System Eng., Jeonbuk Natl. University
dDept. of Mechanical and Automotive Engineering, Songwon University
eDept. of Basic Science, Jeonju University

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

Abstract

Piston rods are key components that absorb shock and vibration energy, and provide handling stability while automotive wheels are rolling. A high-frequency heat treatment process guarantees the surface-hardening durability of piston rods. The Rockwell hardness test is performed to evaluate the degree of surface heat treatment. However, this test does not determine the hardening of the whole surface because only a part of the piston rod surface is tested. Thus, a proper nondestructive method was developed for inspecting the whole surface. The beam profile behavior was predicted by measuring the 360° full profile surface ultrasonic behavior using Rayleigh ultrasonic waves. We implemented a contact-type jig to measure the hardness, developed a simple automated operating system, and data signals were processed with LabVIEW. Finally, we implemented the ultrasonic behavior and optimal test conditions through FEM 3D simulation to produce Rayleigh ultrasonic waves.

Keywords:

Rayleigh ultrasonic wave, Piston rods, 3D simulation, Heat treatment, Simple automatic system

Acknowledgments

This study was supported by Human Resources Development Service of Korea (HRD Korea) as a production technology project. Small venture business department and LINC business result reports partly utilized.

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