By Ioan D. Marinescu
ISBN-10: 0824707044
ISBN-13: 9780824707040
Written by means of professional specialists within the box, this reference explores effective equipment of layout, structural research, and set of rules formula to: lessen waste, noise, and breakage in procedure functionality; establish faults in process development; and attain optimum laptop device functionality. The authors examine matters equivalent to strength, noise, vibration, and acoustic emission to foretell the sturdiness and energy of significant approach parts. They review noise degrees for various sorts of laptop instruments, the impact of erosion, fissure, and chemical diffusion on acoustic emission signs, the function of neural networks in laptop instrument diagnostics, and the Kurtosis approach in digital instrumentation
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Additional info for Handbook of Machine Tool Analysis
Sample text
19 presents a recording of the effective value of the acoustic emission signal on a milling machine with a mill having a single tooth, in three successive passes. The passes are separated by two zones of absence of the AE signal; during the third pass the tooth has broken, a fact highlighted by a peak, and then an abrupt decrease of the effective value of the signal. Concerning the break of the cutting tool, the most frequent causes are the mechanical shock when meeting some hard inclusions in the material to be processed or successive mechanical shocks (on the turning of some polygonal and grooved parts), or the thermal shock as a result of interruption of the cooling liquid.
If the following phenomena are present: insufficient feeding with lubricant of the bearing, overloading of the axle (forces and moments), changing the rotation direction of the axle, and instability of the lubricant film at high rpm, then these lead to a thinner lubricant film and the occurrence of the “fiddlestick” phenomenon, which produces a noise with spectrum peaks at the rotation frequency of the axle fo and at the harmonics of this frequency (2fo , 3fo , . . ). The diagnosis of these bearing types is chiefly carried out by supervising the noise and the acoustic emission.
They are less precise in determining the amount of wear, but they can perceive the fissure and the crack of the cutting edge and do not interrupt the manufacturing process. The most frequently used methods are discussed in the following. 1 Wear Control Used on the basis of processing time, it considers the estimated durability of the tool. 2 Load Characteristics Evaluation of the Tool State The Skandvik Company produces tensometric jacks that must be used in the bearing of the lead screw, because of the special sensibility of the force on the lead direction, comparative to the tool wearing.
Handbook of Machine Tool Analysis by Ioan D. Marinescu
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