OBRABOTKAMETALLOV Vol. 26 No. 2 2024 technology a b Fig. 2. Microstructure of the specimen in the ZY plane (a), in the ZX plane (b) The cutting tool and its geometry Carbide end mills with universal geometry were used as cutting tools for machining steels from group P (Fig. 4) and (Table 4). The cemented carbide of the H10F brand had the following characteristics: ≈ 89.4 wt. % of tungsten carbide; up to 0.6 wt. % of mixed carbides and about 10.0 wt. % of cobalt as a binder. The grain size of the carbide phase is 0.5– 0.6 μm, the bending strength is ≈ 3,200 MPa, and the hardness is 92 HRA. In total, 5 milling cutters were sequentially manufactured on a tool and cutter grinding machine without readjustment. The cemented carbide blanks for manufacturing were taken from one shipment. This made it possible to avoid the appearance of an undesirable factor — the influence of heterogeneity in the quality of the tool material. In order to avoid the effect of wear on the flank or back surface on the data obtained, milling cutters were used that worked to a wear chamfer length no more than 0.10–0.12 mm on the flank or back surface. It is known that the parameters of microgeometry have a stable effect on the mechanics and dynamics of the cutting process, while changing the conditions of friction and wear of the cutting edge [21]. In order to avoid the appearance of this factor on the results of this work, the state of the microgeometry of the cutting edges were estimated. The Edge Master X device, manufactured by Alicona (Switzerland), was used to a b Fig. 3.Typical microstructure of LMD steel 0.12-Cr18-Ni10-Ti (AISI 321)
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