Abstract
The aim of the paper was to examine the influence of cutting conditions on the roughness of surfaces machined by longitudinal turning, namely of surfaces coated with Stellite 6 prepared by high-velocity oxygen fuel (HVOF) technology and applied onto a standard structural steel substrate. From the results of measurements of the cutting parameters, a prediction model of the roughness parameters was created using mathematical and statistical methods. Based on a more detailed analysis and data comparison, a new method for prediction of parameters of longitudinal turning technology was obtained. The main aim of the paper was to identify the mutual discrete relationships between the substrate roughness and the machining parameters. These were the feed rate vc (m·min−1), in the case of turning and milling, and the feed rate f (mm·rev−1) and the depth of cut ap (mm). The paper compared and verified two approaches of this method, namely the mathematical statistical approach, the analytical approach and measured dates. From the evaluated and interpreted results, new equations were formulated, enabling prediction of the material parameters of the workpiece, the technological parameters and the parameters of surface quality.
Highlights
Advanced machining is a highly sophisticated technological process based on stock removal from a workpiece
From the viewpoint of chip machining of Stellite 6 spray, several specific issues exist related to the properties of the spray that impair its machinability
The available cutting speed for the given conditions, the cutting resistance generated during machining, the input power required for machining, the cutting edge temperature, the quality of the machined surface and other parameters are monitored
Summary
Advanced machining is a highly sophisticated technological process based on stock removal from a workpiece. The technologically more demanding type of material machining, from the viewpoint of achieving the desired surface properties, is machining of coatings. The filler material for welding is chosen in connection with the welding technology. From the viewpoint of the physical properties of the material, i.e., in particular, the thermal expansion of the basic and filler material, the values of the coefficients of thermal expansion of both materials must be approximately similar in order to prevent the creation of cracks during solidification. A wide range of iron-based materials exists at present on the market. Martensitic and austenitic alloys have better impact resistance and sufficient abrasion resistance; they are used to harden surfaces. Kracke and Allvac [2] described the Materials 2019, 12, 2551; doi:10.3390/ma12162551 www.mdpi.com/journal/materials
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