The objective of the investigation was to identify surface roughness after turning with wedges of coated sintered carbide. The investigation included predicting the average surface roughness in the dry machining of Duplex Stainless Steel (DSS) and the determination of load curves together with roughness profiles for various cutting conditions. The load curves and roughness profiles for various cutting wedges and variable cutting parameters were compared. It has been shown that dry cutting leads to a decrease in friction for lubricated surfaces, providing a small initial contact area where the surface is contacted. The study has been performed within a production facility during the production of electric motor parts and deep-well pumps.

Digitalization and sustainability are important topics for manufacturing industries as they

are affecting all parts of the production chain. Various initiatives and approaches are set

up to help companies adopt the principles of the fourth industrial revolution with respect

sustainability. Within these actions the use of modern maintenance approaches such as

Maintenance 4.0 is highlighted as one of the prevailing smart & sustainable manufacturing

topics. The goal of this paper is to describe the latest trends within the area of maintenance

management from the perspective of the challenges of the fourth industrial revolution and

the economic, environmental and social challenges of sustainable development. In this work,

intelligent and sustainable maintenance was considered in three perspectives. The first perspective

is the historical perspective, in relation to which evolution has been presented in the

approach to maintenance in accordance with the development of production engineering. The

next perspective is the development perspective, which presents historical perspectives on

maintenance data and data-driven maintenance technology. The third perspective, presents

maintenance in the context of the dimensions of sustainable development and potential opportunities

for including data-driven maintenance technology in the implementation of the

economic, environmental and social challenges of sustainable production.

The paper deals with a study of relations between the measured Ra, Rq, Rz surface roughness parameters, the traverse speed of cutting head v and the vibration parameters, PtP, RMS, vRa, generated during abrasive water jet cutting of the AISI 309 stainless steel. Equations for prediction of the surface roughness parameters were derived according to the vibration parameter and the traverse speed of cutting head. Accuracy of the equations is described according to the Euclidean distances. The results are suitable for an on-line control model simulating abrasive water jet cutting and machining using an accompanying physical phenomenon for the process control which eliminates intervention of the operator.