Modeling of equal channel forward extrusion force using response surface approach

Tiji, SA Nazari; Asgari, Ali; Gholipour, Hamed; Djavanroodi, F.

doi:10.1177/0954405416654088

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Composite volume fraction is also defined as a parameter and a certain number of experiments are done for each volume fraction. In order to reduce the number of experiments, method of response surface methodology (RSM) 26,27 is utilized as design of experiments. By considering the central composite design (CCD), 15 experiments are defined for each composite volume fraction and in sum, number of 30 experiments are done.…”

Section: Methodsmentioning

confidence: 99%

Investigation on the optimal machining of Mg-based composites considering surface roughness, tool life, cutting forces, and productivity

Asgari

Sedighi

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Machining of metal matrix composites (MMC) are being increasingly taken into consideration due to MMCs’ especial features like high strength to weight ratio, resistance to wear and creep. In this paper, effects of cutting parameters on the surface quality, tool life, and cutting force when machining of AZ91/SiC composites are analyzed to make the process optimized. To this end, a design of experiment based on the response surface methodology are done to consider variations of cutting parameters such as cutting speed, feed rate, and depth of cut. Challenges like particles pulled out and tool worn out in the machining process are evaluated. Subsequently, the results of cutting responses are analyzed and a multi-objective optimization is applied on the data to obtain the best surface quality, the highest production volume and the condition at which tool life is longest. The results showed although increasing the feed rate from 0.05 to 0.1 mm/rev leads to the tool life reduction about 70%, it enhances the productivity considerably about 100% for composites with volume fraction 5%. Moreover, at cutting speed 41.05 m/min and feed rate 0.07 mm/rev, machining process of AZ91/SiC-vol.5% becomes efficient.

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Section: Methodsmentioning

confidence: 99%

Investigation on the optimal machining of Mg-based composites considering surface roughness, tool life, cutting forces, and productivity

Asgari

Sedighi

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Afterward, different processes have been developed considering the concept of SPD while multiple studies have been devoted to optimize the SPD processes through modeling and experiments. [1][2][3][4][5] Although multiple processes have been introduced for the imposition of SPD on solid sections like bars and plates, the SPD of hollow sections like tubes has been only considered during the past decade, probably because of the complexities of the related processes. For more explanations, high-pressure tube twisting (HPTT) has been introduced by Toth et al 6 to impose the SPD on tubular sections.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of high strength thin-walled aluminum 6063 tubes through severe plastic deformation combined with peak-aging treatment

Emamidoustabad

Farshidi

Miyamoto

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Thin-walled aluminum tubes are widely used for different structural purposes, and therefore, the development of new methods for strengthening these elements is critical. This matter is especially true for aluminum alloys 6xxx since their maximum strengths projected through peak-aging are considerably lower than the similar strength of other wrought aluminum alloys like 2xxx and 7xxx. Although different works have proposed the imposition of severe plastic deformation for strengthening of 6xxx alloys, the application of this method for thin-walled tubes has been less studied due to the complexities of the severe plastic deformation processing of thin-walled tubes. In this study, the manufacturing of high-strength thin-walled aluminum 6063 tubes through the imposition of a new severe plastic deformation process and a subsequent post-aging treatment at two different temperatures is studied. For this purpose, the tension test is applied to measure the strength variation. Also, the electron backscattering diffraction equipped with scanning electron microscopy and the X-ray diffraction experiments are applied to investigate the microstructural evolution. Results show that the proposed approach can be successfully applied to the manufacturing of high-strength thin-walled aluminum 6063 tubes. Also, the strengthening effect of this procedure is attributed to an increase in the dislocation density and refinement of grains during the imposition of severe plastic deformation and an appearance of finer precipitates during the peak-aging treatment.

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“…2,3 Over the past few decades, various methods have been proposed to apply severe plastic strain to metal materials and convert their structure into very fine-grained or nanostructure. Some of these methods are: equal-channel angular pressing, 4,5 SPD processes using extrusion, [6][7][8] twist extrusion, 9,10 accumulative roll bonding, 11,12 and constrained groove pressing (CGP). [13][14][15] The CGP process, which is the subject of this research, is an efficient method for severe plastic deformation of sheets that has been considered by researchers in recent years.…”

Section: Introductionmentioning

confidence: 99%

Numerical-experimental study of die geometry in the constrained groove pressing of 6061 aluminum sheets

Shahri

Gholami

Rakhshkhorshid

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Nowadays, in line with the need of different industries to the materials with high strength to weight ratio, researchers have drawn attention to the processes of severe plastic deformation. The constrained groove pressing (CGP) is one of the most effective methods of severe plastic deformation to produce high-strength sheet metal using two dies with different shapes (grooved and flat). Despite the advantages of CGP in creating high accumulative plastic strain, this process leads to non-uniformity in mechanical properties of the sheet. This non-uniformity is one of the limitations of the CGP process which is considered in this study. Experimental and numerical studies were performed to investigate CGP process on 6061 aluminum alloy sheet up to two complete passes and the mechanical properties of the sheets were studied. Hardness testing was conducted on the worked material and the increase in the hardness of tested material in both longitudinal and thickness directions were observed. Also, it was shown that the non-uniformity in hardness distribution is correlated to the non-uniformity in the strain distribution. So, validated numerical model was used to develop the response surface method (RSM) and consequently to investigate the effect of geometric parameters in the grooved die on the strain uniformity. Finally, die geometry was optimized using the developed RSM model to produce a sample with more uniformity in strain and hardness distribution.

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Modeling of equal channel forward extrusion force using response surface approach

Cited by 7 publications

References 19 publications

Investigation on the optimal machining of Mg-based composites considering surface roughness, tool life, cutting forces, and productivity

Investigation on the optimal machining of Mg-based composites considering surface roughness, tool life, cutting forces, and productivity

Manufacturing of high strength thin-walled aluminum 6063 tubes through severe plastic deformation combined with peak-aging treatment

Numerical-experimental study of die geometry in the constrained groove pressing of 6061 aluminum sheets

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