FLD and Fractography Analysis of Multiple Sheet Single Point Incremental Forming

Raju, C.; Narayanan, C. Sathiya

doi:10.1007/s12666-015-0679-5

Cited by 21 publications

(10 citation statements)

References 14 publications

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“…The shear dimples were obtained due to the shearing action 7 of the multipoint tool. Also the elliptical voids can be noticed on the SEM images of the sheet metal formed by MPIF.…”

Section: Resultsmentioning

confidence: 99%

“…By observing the fractured sheet obtained during MPIF it can be noticed that shear dimples were formed which is shown in Figure 6(a) and (b). The shear dimples were obtained due to the shearing action 7 of the multipoint tool. Also the elliptical voids can be noticed on the SEM images of the sheet metal formed by MPIF.…”

Section: Fractography Analysismentioning

confidence: 99%

“…They used GRA to predict the optimum value. Raju and Narayanan 6,7 examined a multiple sheet metal forming process using taguchi based DOE method to predict the optimum level of parameters which will improve the output responses in forming process. The authors proved that multiple sheets reduce the time taken to complete the forming process and the characteristics analysis was also made on the sheet metal towards the formability of sheet metal.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of incremental sheet metal forming process using newly designed multipoint tool with the existing single point tool by optimization and characterization methods on austenite stainless steel 202

Ramkumar

Krishnan

Chinnayan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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Incremental Sheet metal Forming (ISF) is a reliable process of converting a blank to work piece with better outputs compared to conventional forming process. The flexibility of ISF in producing the rapid prototype based on the customer needs is increased which is also desirable in the industry. But Single Point Incremental Forming (SPIF) process takes more time to form a product and hence the longer time is a barrier in implementing this process in industries. In this research work, the ISF process was made on sheet metal SS 202 using a newly designed multi-point tool and the obtained outputs were compared with the same material of sheet metal formed by traditionally available single point tool. This Multi Point Incremental Forming (MPIF) process takes lesser process time to give better formability, improved wall angle and good surface roughness. The input process parameters selected for the process are type of tool, speed, feed, Vertical Step Depth (VSD), and lubrication. They are arranged by using the taguchi Design of Experiments (DOE) approach. The responses considered are wall angle, formability, surface roughness, spring back and forming time. The multiple outputs obtained were optimized by Grey Relational Analysis (GRA) to predict the superior parameter. Confirmation test was also made to validate the output result. Fractography analysis was carried out to predict the fracture mechanism obtained during the forming process. The surface topography was also made on the surface of the formed area of the sheet metal. This research work concludes that newly designed MPIF outperforms SPIF.

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“…The shear dimples were obtained due to the shearing action 7 of the multipoint tool. Also the elliptical voids can be noticed on the SEM images of the sheet metal formed by MPIF.…”

Section: Resultsmentioning

confidence: 99%

Section: Fractography Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of incremental sheet metal forming process using newly designed multipoint tool with the existing single point tool by optimization and characterization methods on austenite stainless steel 202

Ramkumar

Krishnan

Chinnayan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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show abstract

“…Hecker [48] developed a standard method using different blank widths, which develops different strains during forming test. The strain hardening index value ('n' value) plays a major role in deciding the formability of the metal and the formability is high for high 'n' value metal [49,50]. For finding the 'n' and 'K' values, built the graph between natural logs of true stress verses true strain.…”

Section: Formability Of Base Metal and Welded Blanksmentioning

confidence: 99%

Studies on influence of torch orientation on microstructure, mechanical properties and formability of AA5052 CMT welded blanks

Girinath

Shanmugam

Sathiyanarayanan

2020

Archiv.Civ.Mech.Eng

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Generally, in gas metal arc welding (GMAW) high heat input causes drastic changes in the microstructures of weldment (fusion zone and heat affected zone), which in turns affects the performance of the welded blanks during forming operation. The present study focuses on the parametric effects such as welding current, welding speed and torch orientation concerning welding direction on mechanical properties, microstructural characterization and formability of AA5052 Cold metal transfer (CMT) welded blanks (WB's). Based on the macrostructure images obtained from various trials (trial 19, 20 and 21, which is corresponding to Drag angle of 10°, 90° or Zero angle and Push angle of 10°, respectively) three were selected for further studies. The macrograph, microstructural evaluation, mechanical behavior and forming limit curve (FLC) of the WB's are examined for the selected parameters and for base metal (BM). The formability of the BM and WB's are investigated by obtaining FLC using Nakajima test. Of the three different torch orientation concerning welding direction, the WB made with 10° push angle yields the superior mechanical properties such as high tensile strength, increase in hardness and more bending strength than the remaining torch orientations. In addition, total elongation and formability are of concern; drag angle of 10° yields the better result, compared to the other torch orientations.

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“…The majority of the research works in SPIF was focused on commercially pure aluminum, copper, stainless steel and its alloys (Narayanasamy and Narayanan, 2006;Raju and Narayanan, 2016;Vigneshwaran et al, 2016). From the previous literature survey it is understood that very lack of literature available on void coalescence and corrosion behaviour of commercially pure titanium during incremental forming (IF) process.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the void coalescence and corrosion behaviour of titanium grade 4 sheets during single point incremental forming process

Yoganjaneyulu

Phaneendra

Ravikumar

et al. 2019

ACMM

Self Cite

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Purpose The purpose of this paper is to investigate the void coalescence and corrosion behaviour of titanium Grade 4 sheets during single point incremental forming (SPIF) process with various spindle rotational speeds. The development of corrosion pits in 3.5 (%) NaCl solution has also been studied during SPIF process. Design/methodology/approach In this current research work, the void coalescence analysis and corrosion behaviour of titanium Grade 4 specimens were studied. A potentio-dynamic polarization (PDP) study was conducted to investigate the corrosion behaviour of titanium Grade 4 processed samples with various spindle speeds in 3.5 (%) NaCl solution. The scanning electron microscope and transmission electron microscope analysis was carried out to study the fracture behaviour and corrosion morphology of processed samples. Findings The titanium Grade 4 sheets obtained better formability and corrosion resistance by increasing the CNC spindle rotational speeds. In fact that, the significant plastic deformation affects the corrosion rate with various spindle speeds were recorded. Originality/value The spindle rotational speeds and vertical step depths increases then the titanium Grade 4 sheets showed better formability, void coalescence and corrosion behaviour as the same is evidenced in forming limit diagram and PDP curves.

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FLD and Fractography Analysis of Multiple Sheet Single Point Incremental Forming

Cited by 21 publications

References 14 publications

Comparison of incremental sheet metal forming process using newly designed multipoint tool with the existing single point tool by optimization and characterization methods on austenite stainless steel 202

Comparison of incremental sheet metal forming process using newly designed multipoint tool with the existing single point tool by optimization and characterization methods on austenite stainless steel 202

Studies on influence of torch orientation on microstructure, mechanical properties and formability of AA5052 CMT welded blanks

Investigations on the void coalescence and corrosion behaviour of titanium grade 4 sheets during single point incremental forming process

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