Abstract
This paper presents the results of investigation that was performed on shafts composed of Inconel 718. Tests were performed in dry and wet conditions. Cutting parameters, such as feed and depth of cut, were constant. The cutting speed was changed. The investigation was performed for various shaft shapes: cylindrical, taper 30°, taper 45°, and sphere. For that reason, the value of the angle between the machined surface and the cutting edge changed. The lowest values of the roughness parameters, Ra and Rz, were obtained for a larger value of the angle between the machined surface and cutting edge. The investigation showed that cutting speed, machining conditions (dry and wet machining), and the variable angle between the machined surface and the cutting edge influenced the surface roughness. Application of a higher cutting speed resulted in lower roughness values. Lower values of roughness parameters were obtained by wet machining.
Highlights
Inconel 718 belongs to the group of heat-resistant alloys based on nickel, called superalloys [1] or high-strength alloys [2]
The results of that work showed that machining with mixed oxide ceramics (Al2 O3 + TiC) produced better surface roughness, and the same was observed with a round insert instead of a rhomboid-shaped one
It was reported that the best surface quality was obtained with the combination of minimum quantity lubrication (MQL) and cryogenic, for which the results were approximately 85% better compared to dry turning
Summary
Inconel 718 belongs to the group of heat-resistant alloys based on nickel, called superalloys [1] or high-strength alloys [2]. Coelho et al [19] investigated the influence of the shape and material of the cutting insert on the surface roughness. The influence of the cutting tool material on the roughness was investigated by Ezugwu and Tang [20] In those tests, ceramic inserts with two types of coatings, ZrO2 and TiC, were used. The effect of cutting speed on roughness was investigated by D’Addon et al [22] They conducted a study in which turning of Inconel 718 was performed at various cutting speeds. The influence of coolant on turning quality was investigated by Kumar et al [24] They proved the well-known assumption that a lack of cooling causes the worst surface quality of the nickel-based superalloy. It was reported that the best surface quality was obtained with the combination of MQL and cryogenic, for which the results were approximately 85% better compared to dry turning
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