This work presents the results of a study to determine the wear behavior of components manufactured by direct metal laser sintering (DMLS). Wear is an important issue in using layer manufactured parts for functional application. Two different bushes were selected for the functional testing for wear behavior studies. Specimens (bushes) were manufactured by DMLS technology and was tested for wear behavior and compared with bushes manufactured by conventional manufacturing methods. Components were manufactured by using the process parameters like sintering speed, hatch spacing, post contouring speed, hatch type and infiltration with an optimized value. Testing was carried out for bushes, used for an automobile engine starter motor. A comparative study for the wear behavior was carried out and results are discussed.

Naiju C D

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Adithan M

Radhakrishnan P

Upendra Sravan Y.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Advanced Materials Research

This work presents the results of a study carried out to determine the sliding wear behavior and its effect on the process parameters of components manufactured by selective laser sintering (SLS). A standard procedure and specimen had been used in the present study to find the wear behavior. Using Taguchi’s experimental technique, an orthogonal array of L4 had been developed. Sliding wear testing using pin-on-disk machine was carried out and analysis of variance (ANOVA) technique was used to investigate the effect of process parameters and to identify the main process parameter that influences the properties of wear behavior on the SLS components. It has been found that scan spacing had more influence on wear as compared to other selected process parameters, slice thickness and infiltration.

Study on the Effect of Process Parameters on Sliding Wear Behavior of Components Produced by Selective Laser Sintering (SLS)

Direct metal laser sintering (DMLS) is one of the methods in layer manufacturing technologies by which metal powder can be directly used to produce both prototype and production tools. The components manufactured by DMLS should have essential hardness for its application in the industry. This study was carried out to determine the optimum process parameters influencing the hardness of the components produced by DMLS. Sintering speed, hatch spacing, post contouring, infiltration and hatch type are the process parameters taken up for study. Statistical design of experiments using Taguchi’s orthogonal array was employed for this study. The experimental data obtained were analyzed using ANOVA. From the results, it is found that one of the process parameters; scan spacing affects the hardness of the parts produced by this technology to a significant extent.

Investigation on the Effect of Process Parameters on Hardness of Components Produced by Direct Metal Laser Sintering (DMLS)

This work presents the results of a study carried out to determine the reciprocating wear behavior and its effect on the process parameters of components manufactured by selective laser sintering (SLS). A standard procedure and specimen had been used in the present study to find the wear behavior. Using Taguchi’s experimental technique, an orthogonal array of modified L9 had been developed. Reciprocating wear testing was carried out and analysis of variance (ANOVA) technique was used to investigate the effect of process parameters and to identify the main process parameter that influences the properties of wear behavior on the SLS components. It has been found that laser power had more influence on wear as compared to other selected process parameters. Micro-structural analysis was also carried out using scanning electron microscope on the wear testing sample.

Study on the Effect of Process Parameters on Reciprocating Wear Behavior of Components Produced by Selective Laser Sintering (SLS)

This work presents the results of a study carried out to determine the topology of lateral surface and its effect on the process parameters of components manufactured by selective laser sintering (SLS). Using Taguchi’s experimental technique, an orthogonal array of L4 had been developed. Surface roughness was measured along built direction and analysis of variance (ANOVA) technique was used to investigate the effect of process parameters and to identify main process parameter that influences surface roughness on SLS components. It has been found that slice thickness and scan spacing have more significant influence than the laser power. Microstructure of the sintered specimen along the build direction was studied using Scanning Electron Microscope (SEM). It was observed that variations in slice thickness affect surface topology of SLS components.

A Study on Topology of Lateral Surface of Components Manufactured by Selective Laser Sintering

Selective laser sintered metallic specimens were tested for fatigue cycles to failure and analyzed for reliability. In this study, Taguchi’s experimental techniques were used to develop a modified L9 orthogonal array. Three different process parameters, laser power, scan spacing and slice thickness were selected for manufacturing the components. Fatigue testing was carried out as per ASTM standards and relationship of the process parameters on the fatigue cycles to failure was investigated. ANOVA method was used to find the dependence of the process parameters and to find the influence of main process parameter on fatigue cycles to failure of the specimens. Laser power was found to be the most significant factor compared to scan speed and slice thickness. Two-parameter Weibull method was used for the reliability studies by which reliability was estimated for different cycles to failure.

Journal	Advanced Materials Research
Publisher	Trans Tech Publications, Ltd.
ISSN	10226680
Open Access	No