This paper deals with investigation of hard milled and ground surfaces via non destructive Barkhausen noise (BN) technique. The paper compares the raw BN signals, extracted BN features such as effective (rms) values and appearance of hysteresis loops produced by grinding and milling cycles. Information about surface state is correlated and confronted with metallographic observations, SEM readings as well as residual stress state. The paper also discusses the specific character of BN signals (and the corresponding BN features) produced by hard milled surface as a result of the magnetic shape memory effect when the machined surface undergoes severe plastic deformation at elevated temperatures.
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Non-conventional methods are used more and more frequently for metal cutting in practice. Some methods such as laser cutting and abrasive water jet cutting are very often applied. Economic and ecological factors strongly influence the application of a method chosen for the cutting process. Considering the economic efficiency there should be formulated a cost model for comparison of different methods of metal cutting. This model should involve all aspects influencing the cutting process. This paper deals with the analysis of important cost items when a material is cut by oxygen , laser and water jet.
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The paper deals with the influence of a cutting fluid on the cutting force and machined surface when turning steel 12050. Cutting fluids, Emulzín H, RO 32 were applied in the experiments. Some of the experiments were performed without a coolant.
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