The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Modification of wear testing machine and study of wear resistance
Author:	Li, Ning
View Online:	njit-etd1993-108 (xii, 63 pages ~ 1.9 MB pdf)
Department:	Department of Mechanical and Industrial Engineering
Degree:	Master of Science
Program:	Mechanical Engineering
Document Type:	Thesis
Advisory Committee:	Dubrovsky, Roman (Committee chair) Chen, Rong-Yaw (Committee member) Harnoy, Avraham (Committee member)
Date:	1993-01
Keywords:	Mechanical wear -- Testing Testing-machines
Availability:	Unrestricted
Abstract:	In this work a modification of a wear testing machine has been done by designing a new loading mechanism and redesigning different components for a new roller-on-roller wear testing machine. A new loading mechanism containing gearbox frame and load cell assembly have been designed, manufactured and assembled. A pusher of the pushing mechanism is redesigned for better durability. Existing bearing support was redesigned and replaced. All new units of the wear testing machine were lined up and assembled with the machine. Finite element stress analysis for designed frame in the load mechanism was performed by using the Integrate Design Engineering Assistant System, known as I-Deas, and ANSYS. More than 30 AISI D2 and H13 tool steel specimens treated by plasma ion nitriding and/or magnetic treatment were tested on a computer controlled wear testing machine. The operational surface roughness has been investigated during all stages of wear. It was found that plasma ion nitriding surface treatment improves the wear resistance of the tool steel dramatically. The higher the nitrogen concentration is used the better the improvement is. Specimens treated with higher nitrogen concentration provide better wear resistance. Surface treated by a combination of processes: ion nitriding and magnetization improve wear resistance. Magnetic treatment applied before ion nitriding provides better influence on durability. Magnetic treatment performed with higher number of cycles provides better wear resistance.