Evaluation of Tribological Characteristics of Material Prepared by DMLS Technology

Abstract

The method of producing molten metal powder according to the European laser sintering system (EOSINT) was used to prepare the experimental material. The used powder metal material was designated EOS Maraging Steel - MS1. It is a steel powder, which is optimized especially for processing in EOSINT M 280 systems. The measurement of tribological characteristics of prepared materials was performed using the standard STN ISO 20808: 2004. The ball-on-disc dry sliding friction and wear experiments have been made on prepared materials in contact with steel ball. For the experiment, there were determined the following conditions: the value of normal load 5 N, the sliding radius 2 mm. Wear testing was carried out at room temperature 25°C using the ball-on-disc technique. Wear behaviour of the prepared material was studied in dry sliding; relative humidity was 26-28%. The normal load of 5 N; and sliding speed of 0.1 m/s was applied. The total sliding distance was 1000 m. The worn surface was analysed by confocal microscope and scanning electron microscope.

Simulation and Optimization of Surface Roughness and Process Performance during Machining of HSS by Micro-WEDM Technology

“…It is general knowledge that the surfaces machined by micro-WEDM technology are characterized by good quality, but the overall performance of the electrical discharge process when machining is very low. However, this is contrary to the current trend, which is oriented towards achieving high quality of the machined surface and at the same time high performance of the process [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. The low performance of the electrical discharge process lies in the physical nature of the material removal method and, at the same time, in the current approach and method of controlling the electrical discharges that take place between the tool electrode and the processed material.…”

“…In addition to these researchers, many others have attempted to investigate the effects of various input factors and their levels on the output performance parameters of the electrical discharge process. However, their research was often limited to selected types of materials in the context of machining performance parameters with subsequent modeling of the material properties of the workpiece and the tool electrode [ 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ]. In their work, Mahapatra et al [ 51 ] evaluated relations and response control factors in WEDM such as MRR and cutting gap width by the Taguchi method.…”