Friction Study in Equal Channel Multi Angular Pressing: Load Curve and Ring Compression tests

Keshtiban, Peyman Mashhadi; Zadshakouyan, Mohammad; Faraji, Ghader

doi:10.1007/s12666-016-0840-9

Cited by 12 publications

(4 citation statements)

References 24 publications

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“…In the subjected figure, there are some solid lines with m = 1, 0.7 … that were achieved by finite element simulations. 18 Also, straight dash lines with points were obtained by experimental tests. Figure 6 shows the variation of shear friction coefficient for different lubrication modes.…”

Section: Resultsmentioning

confidence: 99%

“…MoS 2 and zinc stearate powders have been used as common lubricants in the forging process. 18,19 Peanut oil and walnut oil were chosen as the vegetable base lubricants and SAE 10W oil was selected as the mineral base oil. Owing to the more dimensional stability and environmental compatibility as well as low costs (which allows the nanoparticles usage on an industrial scale), SiO 2 nanoparticles was used as an additive to the base lubricants.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Lubrication efficiency of vegetable oil nano-lubricants and solid powder lubricants

Keshtiban

Ghaleh

Alimirzaloo

2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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Reducing crude oil reserves and also environmental pollution caused by its excessive use has led to numerous researches to find alternatives to petroleum-based oils. Thus, owing to lower pollution and higher lubrication efficiency, the use of vegetable base lubricants has been widely considered. Due to the unique properties of different nanoparticles such as sphericality and high surface area besides low environmental risk, the subjected nanoparticles can be applied as additives to the base lubricants and create optimal tribological properties. In this study, in order to improve the lubricating efficiency of vegetable base lubricants, SiO2 nanoparticles with different weight concentrations were used in the cold forging process of aluminum alloy. Then, the lubrication proficiency of both nano-lubricants and conventional solid powder lubricants in the forging industry was evaluated. Friction coefficient was determined by standard compression test and friction calibration curves. In order to evaluate the lubricants’ efficiency, two key parameters, namely shear friction coefficient and surface roughness have been considered. Experimental results showed that the presence of SiO2 nanoparticles in the base lubricants significantly increased the lubrication efficiency of the base lubricants and notably reduced both the friction coefficient and surface roughness.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Lubrication efficiency of vegetable oil nano-lubricants and solid powder lubricants

Keshtiban

Ghaleh

Alimirzaloo

2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…The samples were precisely polished to minimize friction during the process. 23 Figure 3(a) shows the ECAP tool with a channel angle of U ¼ 115 and channel curvature angle of W ¼ 30 . The ECAP tool components were made of CK60 and hardened up to 60 HRC (695HV).…”

Section: Methodsmentioning

confidence: 99%

Investigation on the anisotropy behavior of copper strips processed by a combination of FSP and ECAP

Keshtiban

Behnagh

Bashirzadeh

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this study, friction stir processed (FSP) pure copper sheet was equal channel angular pressed (ECAP). The purpose was to investigate the influence of ECAP on the microstructure and mechanical properties of the FSP-treated copper sheet. The dynamically recrystallized grained structure with the average grain size of ∼13 µm was found in the stir zone of the FSP. It was also revealed that FSP caused the enhancement of ultimate tensile strength compared to that of the base metal. Also, it was observed that ECAP led to further grain refinement and a tighter distribution of grains. A refined microstructure with an average grain size of ∼ 2 µm was achieved in copper sheets through FSP, followed by ECAP. The tensile strengths of the ECAP specimens were significantly increased to about 61 and 50% compared to the strengths of base metal and FSP, respectively. An overview of the results of this study showed that combined FSP/ECAP is an effective method for the mechanical improvement of the pure copper sheets.

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“…One of the contributing factors which had a significant effect on different Parameters of ECAP process such as equivalent plastic strain and stress is friction coefficient. 7 Suo et al 8 showed that friction plays a key role in the ECAP process, as average plastic strains increase significantly the friction coefficient increases. Hence, numerous methods have been introduced to assess the friction coefficient by using several lubricants in metal-forming process.…”

Section: Introductionmentioning

confidence: 99%

Frictional behavior of severe plastic deformed copper sample by using friction calibration curves

Javdani

Aghaei

Asadollahi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Equal Channel Angular Pressing (ECAP) known as one of the most significant methods involving in severe plastic deformation. There are not many investigations which focus on the design of dies and its analysis by FEM, considering friction coefficients as die geometry parameters; likewise, only few studies have been reported in which the effect of die shape has been analyzed, for example. One of the challenging problems in industrialization of ECAP is designing and manufacturing of die. To avoid trial and error in the next designs, the measurement of right friction coefficient plays a key role, which is used in finite element method to prevent doing experimental test. The main objective of this study was to investigate and find generalized friction calibration curves utilizing the ring compression test. To perform the ring compression test, which is oxygen-free copper with 99.7%, (BS EN 15079 standard) the standard ring specimen ratio of 6:3:2 was used. With use of different lubricants during the ring compression test the relations between friction coefficients and changes of inner and outer diameters was revealed. To solve complicated plasticity equations with complex geometries and boundary conditions with various friction coefficients, finite element method was used. To use more accurate frictional coefficient values with considering different ECAP passes, friction calibration curves were updated.

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Friction Study in Equal Channel Multi Angular Pressing: Load Curve and Ring Compression tests

Cited by 12 publications

References 24 publications

Lubrication efficiency of vegetable oil nano-lubricants and solid powder lubricants

Lubrication efficiency of vegetable oil nano-lubricants and solid powder lubricants

Investigation on the anisotropy behavior of copper strips processed by a combination of FSP and ECAP

Frictional behavior of severe plastic deformed copper sample by using friction calibration curves

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