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Article
Publication date: 12 January 2022

Chia-Hung Hung, Tunay Turk, M. Hossein Sehhat and Ming C. Leu

This paper aims to present the development and experimental study of a fully automated system using a novel laser additive manufacturing technology called laser foil printing…

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Abstract

Purpose

This paper aims to present the development and experimental study of a fully automated system using a novel laser additive manufacturing technology called laser foil printing (LFP), to fabricate metal parts layer by layer. The mechanical properties of parts fabricated with this novel system are compared with those of comparable methodologies to emphasize the suitability of this process.

Design/methodology/approach

Test specimens and parts with different geometries were fabricated from 304L stainless steel foil using an automated LFP system. The dimensions of the fabricated parts were measured, and the mechanical properties of the test specimens were characterized in terms of mechanical strength and elongation.

Findings

The properties of parts fabricated with the automated LFP system were compared with those of parts fabricated with the powder bed fusion additive manufacturing methods. The mechanical strength is higher than those of parts fabricated by the laser powder bed fusion and directed energy deposition technologies.

Originality/value

To the best knowledge of authors, this is the first time a fully automated LFP system has been developed and the properties of its fabricated parts were compared with other additive manufacturing methods for evaluation.

Details

Rapid Prototyping Journal, vol. 28 no. 6
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 9 July 2024

Alessandro Pellegrini, Fulvio Lavecchia and Maria Grazia Guerra

This work is focused on the realization of copper parts using the material extrusion additive manufacturing debinding and sintering (MEX+D&S) technology.

97

Abstract

Purpose

This work is focused on the realization of copper parts using the material extrusion additive manufacturing debinding and sintering (MEX+D&S) technology.

Design/methodology/approach

A highly filled filament with 90 Wt.% of copper is used to realize nine different combinations varying the printing speed and the flow rate. The following thermal debinding and sintering are performed at 483 °C and 1057 °C, respectively, burying the samples in specific refractory powder and carbon. The green and sintered density are measured and an inspection at optical microscope is implemented for a detailed internal analysis of the defects.

Findings

The samples, that reported the highest values of the green density, become the worst in the sintered condition due to evident swelling defect generated by the entrapped polymer during the thermal debinding. On the other hand, the parts with the lower values of green density allowed to achieve a satisfying density value without significant external defects.

Originality/value

The realization of copper parts through laser-based additive manufacturing technologies shows several troubles related to the rapid heat transfer and the high reflectivity of copper, which is a hinder of the absorption of the laser power. The MEX+D&S becomes an easier and economical alternative for the realization of copper parts. The internal inspection of the samples revealed the need for the improvement on the process chain, adopting a different debinding process to open channels during the thermal debinding to avoid the entrapment of the polymer.

Details

Rapid Prototyping Journal, vol. 30 no. 7
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 5 March 2018

Farzad Fesharaki and Saied Sehhat

This paper aims to introduce and promote the novel concept of Islamic human resource management (iHRM) and assess its effects upon two organizational attitudes, namely, perceived…

1495

Abstract

Purpose

This paper aims to introduce and promote the novel concept of Islamic human resource management (iHRM) and assess its effects upon two organizational attitudes, namely, perceived justice and employees’ commitment.

Design/methodology/approach

The present study is an applicable and empirical research that has used the descriptive–correlative method. The target population consists of 192 employees from Resalat Qard al-Hasan Bank in the city of Tehran. Calculated based on Cochran’s formula, 128 people are selected by means of a simple random sampling technique. To collect primary filed data, questionnaires are distributed. The gathered responses are analyzed with the structural equation modeling approach using SmartPLS software package.

Findings

Four dimensions of iHRM, i.e. recruitment and selection, training and development, remuneration and compensation and performance appraisal, are positively associated with organizational justice. Also the first three dimensions have a positive impact on employees’ commitment, but the link between performance appraisal and employees’ commitment is not statistically significant because of the slightly negative attitude of the employees toward a possible perfunctory routine.

Originality/value

iHRM is one of the emerging trends in Islamic management literature, with limited studies conducted in this specific field. The current effort is one of the first attempts to empirically investigate this relatively new construct in the context of Iran.

Details

Journal of Islamic Marketing, vol. 9 no. 1
Type: Research Article
ISSN: 1759-0833

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