Influence of the Regime of Electropulsing-Assisted Machining on the Plastic Deformation of the Layer Being Cut

Hameed, Shafqat; Rojas, Hernan Alberto González; Benavides, Josep Ignasi Perat; Alberro, Amelia Nápoles; Egea, Antonio J. Sánchez

doi:10.3390/ma11060886

Cited by 28 publications

(12 citation statements)

References 31 publications

(40 reference statements)

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“…As can be seen on table 3, chip ratio is lower when the machining process is assisted with electropulses, a situation also described on [28]; if chip thickness decreases, so does the shear stress [29], evidencing how the pulsed current produces an effect on chip shape and the material plasticity. The reasons behind this phenomenon are not completely understood and the Joule effect is one of the ideas most widely accepted as an answer to its genesis.…”

Section: Roughness Chip Dimensions and Chip Ratiomentioning

confidence: 94%

Effect of Electropulses on the Machinability of a C45e Steel

Montaña

Echeverri

Rojas

2019

DYNAII

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This article compares the machinability of a C45E (AISI/SAE 1045) steel type under two different manufacturing processes: conventional machining and pulsed current assisted machining. The testing procedure consisted on the dry turning, using a coated carbide cutting tool (HM) and highspeed steel (HSS) cutting tools, under two different spindle speeds. In this study cutting tool life is evaluated in function of cutting speed for both machining conditions and both cutting tools. Results show variation on flank wear depending on the tool used and cutting speed, showing an increase in machinability when using the HM tool with the electropulse assisted turning at low cutting speed. Additionally, changes in chip type are found when assisting the process with electropulses. Statistically significant variations in chip dimensions and chip ratio are present, evidencing the differences in the phenomena affecting shear strain. Surface roughness, for its part, is improved when turning with the assistance of electropulses.

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Section: Roughness Chip Dimensions and Chip Ratiomentioning

confidence: 94%

Effect of Electropulses on the Machinability of a C45e Steel

Montaña

Echeverri

Rojas

2019

DYNAII

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“…Polishing and deburring is a process with great automation possibilities, by means of robots [13]. Force feedback control is the key aspect to be considered.…”

Section: Automatic Processmentioning

confidence: 99%

“…Regarding the helical milling, there are two similar helical milling techniques: Ball Helical Milling (BHM) and Contouring Ball Helical Milling (CBHM) [9]; results were quite good in quality but times were far from those obtained in twist-drilling operation, or in other processes [10][11] Takt-time in aeroengine manufacturing prevent in many cases to replace the drilling with twist drills, so edge burrs and not very good finishing are common issues. In emerging processes, the plasticity of metal is also key, as shown in [12][13] In this paper, brushing techniques using abrasive flexible tools are studied. The aim is to implement these tools for the finishing process, being able to improve the surface finish obtained on one hand, and get the rounding of edges in countersunk holes on the other.…”

Section: Introductionmentioning

confidence: 99%

Flexible Abrasive Tools for Deburring and Finishing of Holes in Superalloys

Rodríguez¹,

Fernández²,

Calle³

et al. 2018

Preprint

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Many manufacturing sectors require high surface finishing. After machining operations such as milling or drilling, undesirable burrs or insufficient edge finishing may be generated. For decades, many finishing processes have been handmade-basis; this fact is accentuated when dealing with complex geometries especially for high value-added parts. In recent years, it’s a tendency of trying to automate as far as possible this kind of processes, repeatability and time/money savings are main purposes. Based on that idea, the aim of this work is to check new tools and strategies for finishing aeronautical parts, especially critical engine parts made on Inconel 718, a very ductile nickel alloy. Automating edge finishing of chamfered holes is a complicated but really important goal. In this paper, flexible abrasive tools were used for this purpose. A complete study of different abrasive possibilities was carried out, mainly focusing on roughness analysis and final edge results obtained.

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“…The scope of their applications is extensive but has one distinction-products of ceramic and hard alloys are used in extreme operating conditions under heat and ultimate loads. In this condition, no other material can provide the necessary performance, heat and wear resistance [4,5].…”

Section: Introductionmentioning

confidence: 99%

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

et al. 2019

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The inability of ceramic and nanoceramic processing without expensive diamond tools and with a high-material-removal rate hampers the scope of its potential applications and does not allow humanity to make a full shift to the sixth technological paradigm associated with Kuhn scientific revolutions and Kondratieff's waves and restrains the growth of the economy. The authors completed a review on the research state of ceramic and nanoceramic processing by electrical discharge machining, which is possibly solved by two principal approaches associated with the usage of standard commercially available machine tools. The first approach is related to the introduction of expensive secondary phase; the second approach proposes initiate processing by adding auxiliary electrodes in the form of coating, suspension, aerosol, or 3D-printed layer based on the components of silver, copper, or graphite in combination with an improved dielectric oil environment by introducing graphite or carbon nanoparticles, which is hugely relevant today.Technologies 2019, 7, 55 2 of 16 of cutting tools limits the resulting geometry of the product. Other machining methods such as vibroacoustic machining, laser and electron beam scribing, selective laser sintering with a binder, find their specific place in the processing of ceramics. However, they do not allow the receiving of all geometrically possible shapes of the product without losses on the operational parameters of ceramics [16][17][18].One of the most popular methods for the production of parts, regardless of their hardness, is electrical discharge machining (EDM). However, it requires the material to be conductive [19][20][21]. The process of electrical erosion of the material consists of initiating electric pulses in the interelectrode gap, in the breakdown of the dielectric medium in the gap, in establishing a discharge channel, where the temperature reaches more than 10,000 • C (low-temperature plasma). Due to such temperatures, the material is ablated, the drops of cooled material as eroded debris are washed away by the flow of the dielectric medium, and the electrodes again approach to resume the cycle. Thus, a unique crater-like topology on the surface of the workpiece is created [22][23][24][25].The inability of ceramics and nanoceramics to conduct current hampers the scope of its potential applications and restrains the growth of the progress and the switch to the next technological paradigm that most of the scientists associate with the term "nano" [26][27][28][29][30][31][32].Thus, it can be concluded that the study and development of a method for electrical discharge machining of non-conductive ceramics and nanoceramics are incredibly relevant today.The authors propose to apply the dialectical approach of cognition as a scientific approach to solve the formulated scientific problem. The dialectical approach includes the systematization and updating of existing knowledge and new data about the object of research.

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Influence of the Regime of Electropulsing-Assisted Machining on the Plastic Deformation of the Layer Being Cut

Cited by 28 publications

References 31 publications

Effect of Electropulses on the Machinability of a C45e Steel

Effect of Electropulses on the Machinability of a C45e Steel

Flexible Abrasive Tools for Deburring and Finishing of Holes in Superalloys

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

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