Contemporary state and outlook for development of metrological assurance in the machine-building industry

Grigoriev, S. N.; Masterenko, D. A.; Teleshevskii, V. I.; Emel'yanov, P. N.

doi:10.1007/s11018-013-0126-0

Cited by 68 publications

(19 citation statements)

References 6 publications

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“…The observed behavior of the signal (Figures 5 and 6) can be correlated with the particular features of elastic and plastic deformation during the ductile failure according to the stress-strain curves and scheme of fracture formation (Figure 2) as aluminum shows better ductility during destruction that actually associated with a stretch of the interatomic bonds [56][57][58][59][60]. It correlates with the recorded signal when more brittle material-steel shows an adequate signal response even for the samples of 4 g when data received for ductile aluminum alloy are less significant but can also be registered for monitoring and control of samples of more than 2 g. That all make a basis for the development of multi-parameter control systems and switch to the next technological paradigm [61][62][63][64][65][66][67].…”

Section: Discharge Pulses and Oscillations Controlmentioning

confidence: 56%

Wire Tool Electrode Behavior and Wear under Discharge Pulses

et al. 2020

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This work is devoted to researching the tool electrode behavior and wear under discharge pulses at electrical discharge machining. The experiments were conducted on the workpieces of 12Kh18N10T (AISI 321) chrome-nickel anti-corrosion steel and D16 (AA 2024) duralumin by a 0.25-mm-diameter CuZn35 brass tool in a deionized water medium. The developed diagnostic and monitoring mean based on acoustic emission registered the oscillations accompanying machining at 4–8 kHz. The obtained workpiece and non-profiled tool surfaces were investigated by optical and scanning electron microscopy. Calculated volumetric and mass removal rates showed the difference in the character of wear at roughing and finishing. It was shown that interaction between material components in anti-corrosion steel machining had an explosive character between Zn of brass and Ni of steel at a micron level and formed multiple craters of 30–100 µm. The secondary structure and topology of worn tool surfaces were caused by material sublimation, chemical interaction between material components at high heat (10,000 °C), explosive deposition of the secondary structure. Acoustic diagnostics adequately registered the character of interaction. The observed phenomena at the submicron level and microstructure of the obtained surfaces provide grounding on the nature of material interactions and electrical erosion wear fundamentals.

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Section: Discharge Pulses and Oscillations Controlmentioning

confidence: 56%

Wire Tool Electrode Behavior and Wear under Discharge Pulses

et al. 2020

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“…A small increase in Δ may change the breakdown conditions or even interrupt the discharge; a decrease in Δ impairs the yield of erosion products, reduces the productivity, promotes slag buildup on the electrodes, and facilitates short circuits. Without automatic regulation of the gap, EDM is ineffective [1, 12, 72]. For better regulation, Δ must be maintained above the value at which short circuits appear, and below the value at which breakdown is impossible and idling pulses appear.…”

Section: Discussionmentioning

confidence: 99%

“…Electrical discharge machining (EDM) is one of the priciest machining processes for producing metallic parts with complex linear surfaces and roughness Ra of up to 0.17–0.2 [1, 2, 3, 4, 5]. Modern computer numerical control (CNC) machines allow producing parts with a positioning accuracy of guiding bars of up to 80 nm [6, 7, 8, 9].…”

Section: Introductionmentioning

confidence: 99%

Electrical discharge machining of ceramic nanocomposites: sublimation phenomena and adaptive control

Grigoriev

Kozochkin

Porvatov

et al. 2019

Heliyon

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The productivity of electrical discharge machining (EDM) is relatively low owing to the natural laws of electrical erosion. Precise EDM demands uninterrupted control of the discharge gap and adjustment of process parameters. It is particularly critical for processing large workpieces with complex linear surfaces and for materials with threshold conductivities such as the new advanced ceramic nanocomposites Al2O3+TiC and Al2O3+SiCw+TiC(30–40%). In these cases, adequate flushing of erosion products is hampered by the geometry of the working space or by the small value of the required discharge gap, which does not exceed 2.2–2.5 μm. The methods of adaptive control in modern computer numerical control systems of EDM equipment based on measuring the electrical parameters in the working zone have been shown to be ineffective in the cases described above. This study aims to investigate the natural phenomena of material sublimation under discharge pulses for conductive ceramics and nanocomposites. The measured conductivities of the samples are higher than the percolation threshold. However, the question of machinability remains open owing to detected processing interruptions and poor quality of machined surfaces. New knowledge on EDM of conductive ceramics and nanocomposites can improve the final quality of the machined surfaces and productivity of the method by the introduction of advanced monitoring and control methods based on acoustic emissions. The manuscript presents an up-to-date overview and current state of the research on the subject area. The obtained morphology of the samples and discussion of the findings complete the experimental part of the study. The scientific basis for a new type of adaptive control system is provided. This can improve the effectiveness of parameter control for machining conductive ceramics and nanocomposites and contribute to an increase in the EDM performance for the most critical cases.

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“…The idle pulses are always addressed to the destruction of erosion products when the working pulses are addressed to the destruction of the workpiece electrode. One of the solutions can be in the development of the multiparameter control system that counts not only every occurred impulse in the interelectrode gap, but only working pulses, using a monitoring system based on acoustic emission [36,37]. The actuality of the monitoring system's development, based on acoustic emission, that occurs at the moment of workpiece destruction, can be even higher in the context of innovative electrical discharge machining assisted with conductive powders or pellets or nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Electrical Discharge Machining of Oxide Nanocomposite: Nanomodification of Surface and Subsurface Layers

Grigoriev

Волосова

Okunkova

et al. 2020

JMMP

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The work is devoted to the research of the changes that occur in the subsurface layer of the workpiece during electrical discharge machining of conductive nanocomposite based on alumina with the use of a brass tool. The nanocomposite of Al2O3 + 30% of TiC was electroerosively machined in a water and hydrocarbon oil. The process of electrical discharge machining is accompanied by oscillations that were registered by diagnostic means. The obtained surface of the samples was researched by the means of scanning electron microscopy and X-ray photoelectron spectroscopy. The observed surface and subsurface changes provide grounding for the conclusions on the nature of processes and reactions that occur between two electrodes and nanomodification of the obtained surfaces that can be an advantage for a series of applications.

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Contemporary state and outlook for development of metrological assurance in the machine-building industry

Cited by 68 publications

References 6 publications

Wire Tool Electrode Behavior and Wear under Discharge Pulses

Wire Tool Electrode Behavior and Wear under Discharge Pulses

Electrical discharge machining of ceramic nanocomposites: sublimation phenomena and adaptive control

Electrical Discharge Machining of Oxide Nanocomposite: Nanomodification of Surface and Subsurface Layers

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