TRIBOLOGICAL CHARACTERISTICS OF ADDITIVE MANUFACTURED COMPONENTS BY DIGITAL LIGHT PROCESSING, SUBJECTED TO LINEAR RECIPROCATING MOTION

Gheorghe MACOVEI, Marcelin BENCHEA, Shubrajit BHAUMIK, Viorel PALEU

Abstract


In the field of additive manufacturing, digital light processing (DLP) technology has emerged as a practical and inexpensive solution for the manufacturing of mechanical components based on photocurable resins, which are used in various areas of industry. Often these components are in motion, relative to the counterpart, and in contact with metal components, and subjected to friction and wear. This study presents the influence of UV treatment on tribological characteristics, applied to a set of samples fabricated by digital light processing, for the case where they are subjected to reciprocating linear motion. Anycubic Mono 4K printer was used to fabricate the samples. Samples were cured for 3 (s), 4 (s), 5 (s) and 20 (s). A separate set of samples, manufactured and cured under the same parameters, is naturally aged for six months. The tests were performed on the CETR-UMT2 micro tribometer, for which the metal counterpart is a bearing ball with a diameter of 6.35 (mm). The applied load for the friction tests is 10 (N), with a contact speed of 5 (mm/s), for a sliding distance of 10 (mm), over a period of time of 600 (s). The scratching tests has been performed under a normal force of 5 (N), at a speed of 0.167 (mm/s) and a scratching time of 60 (s), for a distance of 10 (mm). The denting tests has been performed using a Rockwell diamond tip, with a force applied in five different steps up to 5 (N). Tribological tests showed that the friction coefficient exhibits two stages. In the running-in phase, the value of the friction coefficient increases drastically, followed by a stabilization phase at a very small value, with a small tendency of growing. The scratching test showed that the UV curing time has no significant impact in the scratching depth. Also, the applied load varies proportional with the scratching depth.

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