Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

Vagaská, Alena; Harničárová, Marta; Valíček, Ján; Kušnerová, Milena; Czán, Andrej; Kmec, Ján

doi:10.3390/coatings9010057

Cited by 13 publications

(7 citation statements)

References 43 publications

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“…The surface properties after EDM in many cases require additional finishing operations [23,24,25,26] or coatings [27,28,29] for industrial application. This leads to an increased production cost.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Reduced Graphene Oxide Flakes in the Dielectric on Surface Characteristics and Material Removal Rate in EDM

Świercz¹,

Oniszczuk-Świercz²

2019

Materials

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Electrical discharge machining (EDM) is an advanced technology used to manufacture difficult-to-cut conductive materials. However, the surface layer properties after EDM require additional finishing operations in many cases. Therefore, new methods implemented in EDM are being developed to improve surface characteristics and the material removal rate. This paper presents new research about improving the surface integrity of 55NiCrMoV7 tool steel by using reduced graphene oxide (RGO) flakes in the dielectric. The main goal of the research was to investigate the influence of RGO flakes in the dielectric on electrical discharge propagation and heat dissipation in the gap. The investigation of the influence of discharge current I and pulse time ton during EDM with RGO flakes in the dielectric was carried out using response surface methodology. Furthermore, the surface texture properties and metallographic structure after EDM with RGO in the dielectric and conventional EDM were investigated and described. The obtained results indicate that using RGO flakes in the dielectric leads to a decreased surface roughness and recast layer thickness with an increased material removal rate (MRR). The presence of RGO flakes in the dielectric reduced the breakdown voltage and allowed several discharges to occur during one pulse. The dispersion of the discharge caused a decrease in the energy delivered to the workpiece. In terms of the finishing EDM parameters, there was a 460% reduction in roughness Ra with a uniform distribution of the recast layer on the surface, and a slight increase in MRR (12%) was obtained.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Reduced Graphene Oxide Flakes in the Dielectric on Surface Characteristics and Material Removal Rate in EDM

Świercz¹,

Oniszczuk-Świercz²

2019

Materials

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“…Moreover, our interest is supported by the 25 years of practical experience of one of our co-authors in the surface treatment field. Noticeable results are presented in [33][34][35].…”

Section: Introductionmentioning

confidence: 82%

“…The process of anodizing on aluminium in mixed sulfuric-oxalic acid electrolyte is used to improve the mechanical properties of plated parts because the hardness, thickness, and wear resistance of an anodic aluminium oxide layer (AOL) on aluminium must be high enough for industrial purposes. Many works have studied the effect of anodizing conditions such as electrolyte composition [36][37][38][39], electrolyte temperature [36,37,40,41], current density [36,37,40,42], time of deposition [33] on the properties of the AOL. Bensalah et al deals in [36][37][38] with the studying of mechanical and tribological properties of alumina coatings formed in various conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The optimal experimental condition was calculated, and the response values were estimated. Deeper and more complex identification of significant chemical and technological factors affecting the thickness of the formed AOL by the electrolysis method in a sulfuric acid solution is presented in [33], where defined input variables are varied simultaneously during the experimental procedure. On the other hand, much of the research so far has studied the influence of process parameters on the AOL properties by varying only one factor and keeping other factors constant.…”

Section: Introductionmentioning

confidence: 99%

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Selected Mathematical Optimization Methods for Solving Problems of Engineering Practice

2022

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Engineering optimization is the subject of interest for many scientific research teams on a global scale; it is a part of today’s mathematical modelling and control of processes and systems. The attention in this article is focused on optimization modelling of technological processes of surface treatment. To date, a multitude of articles are devoted to the applications of mathematical optimization methods to control technological processes, but the situation is different for surface treatment processes, especially for anodizing. We perceive their lack more, so this state has stimulated our interest, and the article contributes to filling the gap in scientific research in this area. The article deals with the application of non-linear programming (NLP) methods to optimise the process of anodic oxidation of aluminium using MATLAB toolboxes. The implementation of optimization methods is illustrated by solving a specific problem from engineering practice. The novelty of this article lies in the selection of effective approaches to the statement of optimal process conditions for anodizing. To solve this complex problem, a solving strategy based on the design of experiments approach (for five factors), exploratory data analysis, confirmatory analysis, and optimization modelling is proposed. The original results have been obtained through the experiment (performed by using the DOE approach), statistical analysis, and optimization procedure. The main contribution of this study is the developed mathematical-statistical computational (MSC) model predicting the thickness of the resulting aluminium anodic oxide layer (AOL). Based on the MSC model, the main goal has been achieved—the statement of optimal values of factors acting during the anodizing process to achieve the thickness of the protective layer required by clients, namely, for 5, 7, 10, and 15 [μm].

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“…However, most of the works are focused on the accuracy of the programmed tool path, especially on obtaining high accuracy in the corner cut [21][22][23]. The quality of the surface after the WEDM process does not always meet expectations therefore additional technological operations are used [24][25][26][27] to improve surface quality. However, the use of additional treatments significantly increases the production costs.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Świercz

Oniszczuk-Świercz

Zawora

et al. 2019

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New materials require the use of advanced technology in manufacturing parts of complex shape. One of the modern nonconventional technology of manufacturing difficult to cut materials is the wire electrical discharge machining (WEDM). The article presents the results of theoretical and experimental research in the influence of the WEDM conditions and parameters on the shape deviation during a rough cut. A numerical model of the dielectric flow in the gap (ANSYS) was developed. The influence of the dielectric velocity field in the gap on the debris evacuation and stability of WEDM process was discussed. Furthermore, response surface methodology (RSM) was used to build empirical models for influence of the wire speed V d , wire tension force F n , the volume flow rate of the dielectric Q v on the flatness deviation after the WEDM.

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Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

Cited by 13 publications

References 43 publications

Investigation of the Influence of Reduced Graphene Oxide Flakes in the Dielectric on Surface Characteristics and Material Removal Rate in EDM

Investigation of the Influence of Reduced Graphene Oxide Flakes in the Dielectric on Surface Characteristics and Material Removal Rate in EDM

Selected Mathematical Optimization Methods for Solving Problems of Engineering Practice

Archives of Metallurgy and Materials

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