Identification of Residual Stresses in a Surface Layer of Ti6AL4V and Inconel 718 after Process of Peripheral Milling

Krajewska-Śpiewak, Joanna; Gawlik, Józef; Piekoszewski, W.; Stachura, K.

doi:10.17559/tv-20160531085315

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…It is a complicated issue, and addressing this issue in a comprehensive way is difficult, as the process of the occurrence of post-machining deformations is complex and depends on multiple factors. One of the main causes includes internal stress generated at each stage of a given technological process [26]. Various methods are used in the machine industry to eliminate internal stress: for instance, vibration and thermal methods.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Geometry of Thin-Walled Aluminium Alloy Elements on Their Deformations after Milling

2022

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The aim of this paper is to analyse the effect of the selected geometric properties of thin-walled structures on post-machining deformations. In the study, EN AW-7075 T651 and EN AW-6082 T651 aluminium alloys were used to prepare specially designed thin-walled sample elements, i.e., elements with walls arranged in a semi-open and closed structure and with a dimension of 165 × 262 × 50.8 mm consisting of bottom and vertical stiffening walls and so-called ribs with a thickness of 1 mm. The measurements of the absolute deformations of the thin-walled bottom were performed with the use of a Vista coordinate-measuring machine by Zeiss with a PH10 head by Renishaw. Based on the obtained results, it was found that absolute deformation values were higher for walls arranged in a semi-open structure. It is related to a lower rigidity of the tested structure resulting from the lack of a stiffening wall, which is the so-called “rib”. Notwithstanding the geometry of the elements, greater absolute deformation values were recorded following conventional cutting methods. The use of high-speed cutting (HSC) provided positive outcomes in terms of minimising the deformation of thin-walled elements. Additionally, it was found that higher absolute deformations were obtained for EN AW-7075 T651 alloy.

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Section: Introductionmentioning

confidence: 99%

Effect of the Geometry of Thin-Walled Aluminium Alloy Elements on Their Deformations after Milling

2022

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“…The mechanical model mostly refers to machining, and the thermal model is characteristic for abrasive machining and HSC. It must be highlighted that residual stresses occur at the depth of a few decimals of a millimetre and depend on numerous factors, e.g., machining parameters, tool geometry and machining methods [25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Techniques for Thin-Walled Element Milling with Respect to Minimising Post-Machining Deformations

et al. 2020

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The paper examines the impact of selected machining techniques and the semi-finished product technological history on deformations of thin-walled elements made of EN AW-2024 T351 aluminium alloy after milling. The following techniques have been implemented: High Performance Cutting, High Speed Cutting, conventional finishing (CF) and combinations of these techniques. As for the semi-finished product technological history, the rolling direction has been analysed. It has been assumed that it can be relevant in relation to the cutting tool feed direction and, in consequence, exert considerable impact on the stress, as well as deformation following machining. The interest in this issue proceeds from significant challenges faced by the industry, particularly in the aerospace sector. The analysis of results obtained has shown that milling in the direction perpendicular to the rolling direction results in larger deformations than milling in the parallel direction. Additionally, it has been revealed that applying a correctly selected machining technique makes it possible to minimise post-machining deformations of thin-walled elements.

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“…Recently, investigators solved the trade-off among multiresponses regarding surface quality, energy consumed, and processing efficiency. The technological responses included are cutting energy [11], tool wear [12], cutting force [13][14][15][16], residual stress [17], material removal rate [18], and machining time [19]. Additionally, the surface geometry [20], chip formation [21,22], micro-hardness, and microstructure [23] were considered as important technical outputs.…”

Section: Introductionmentioning

confidence: 99%

Optimization Parameters of Milling Process of Mould Material for Decreasing Machining Power and Surface Roughness Criteria

et al. 2019

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Improving milling performances is an effective solution to decrease the costs required. This paper addressed a multi-response optimization to simultaneously decrease the machining power consumed Pm, arithmetical roughness Ra, and ten-spot roughness Rz. The Grey-Response Surface Method-Multi Island Genetic Algorithm (GRMA) consisting of grey relational analysis (GRA), response surface method (RSM), and multi-island genetic algorithm (MA) was proposed to predict the optimal parameters and yield optimum milling performances. The experimental trials were conducted with the support of a CNC milling center. The influences of spindle speed (S), depth of cut (ap), feed rate (fz), and tip radius (r) were explored using GRA. The nonlinear relationship between machining parameters and grey grade (GG) model was developed using RSM. Finally, two optimization techniques, including desirability approach (DA) and MA were performed to observe the optimal values. The results indicated that the machining power was greatly affected by processing factors and the radius has a significant impact on the roughness criteria. The measured reductions using optimal parameters of Pm, Ra, and Rz are approximately 77.05%, 50.00%, and 58.02%, respectively, as compared to initial settings. The GRMA can be considered as an effective approach to generate reliable values of processing conditions and technological performances in the milling process.

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Identification of Residual Stresses in a Surface Layer of Ti6AL4V and Inconel 718 after Process of Peripheral Milling

Cited by 4 publications

References 2 publications

Effect of the Geometry of Thin-Walled Aluminium Alloy Elements on Their Deformations after Milling

Effect of the Geometry of Thin-Walled Aluminium Alloy Elements on Their Deformations after Milling

Techniques for Thin-Walled Element Milling with Respect to Minimising Post-Machining Deformations

Optimization Parameters of Milling Process of Mould Material for Decreasing Machining Power and Surface Roughness Criteria

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