Study of Forming Limit for Rotational Incremental Sheet Forming of Magnesium Alloy Sheet

Park, Jingee; Kim, Jeounghan; Park, Nhokwang; Kim, Young-Suk

doi:10.1007/s11661-009-0043-7

Cited by 46 publications

(14 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[15][16][17] Kim and Yang [18] proposed a double-forming technique to improve formability, assuming that only shear deformation occurs in the material. Plus, Park et al [19] studied and showed the possibility of cup incremental forming of a magnesium sheet at RT with a rotational tool, where the tool rotates itself.…”

Section: Duc-toan Nguyen Jin-gee Park and Young-suk Kimmentioning

confidence: 99%

“…Therefore, Park et al [19] proposed rotational incremental sheet forming, which improves the formability of sheet materials, when compared with ISF, due to the large amount of heat generated in the contact area as a result of the friction energy at the tool-specimen interface and plastic deformation energy from the shear deformation.…”

Section: Duc-toan Nguyen Jin-gee Park and Young-suk Kimmentioning

confidence: 99%

“…If quasi-static experiments, at the same strain rate, are carried out at two different temperatures, denoted by the superscripts in Eqs. [18] and [19], the ratio r between the stresses at a specific plastic strain can be expressed as…”

Section: B Jc Model At Elevated Temperaturesmentioning

confidence: 99%

“…The tool radius was 6 mm and the feed rate was 400 mm/ min. As used in a previous study, [19] in the experiment, the spindle speed of the tool was 4000 rpm counterclockwise in the -z direction until the temperature of the tool reached 373 K (100°C) in the case of a 45 deg wall angle, and then set to 3000 rpm. When the temperature of the tool exceeded 373 K (100°C), chips of magnesium were generated in the contact area between the specimen and the tool.…”

Section: B Jc Model At Elevated Temperaturesmentioning

confidence: 99%

See 3 more Smart Citations

Ductile Fracture Prediction in Rotational Incremental Forming for Magnesium Alloy Sheets Using Combined Kinematic/Isotropic Hardening Model

Nguyen

Park

Kim

2010

Metall Mater Trans A

View full text Add to dashboard Cite

To predict the ductile fracture of a magnesium alloy sheet when using rotational incremental forming, a combined kinematic and isotropic hardening law is implemented and evaluated from the histories of the ductile fracture value (I) using a finite element analysis. Here, the criterion for a ductile fracture, as developed by Oyane (J. Mech. Work. Technol., 1980, vol. 4, pp. 65-81), is applied via a user material based on a finite element analysis. To simulate the effect of the large amount of heat generation at elements in the contact area due to the friction energy of the rotational tool-specimen interface on the equivalent stress-strain evolution in incremental forming, the Johnson-Cook (JC) model was applied and the results compared with equivalent stress-strain curves obtained from tensile tests at elevated temperatures. The finite element (FE) simulation results for a ductile fracture were compared with the experimental results for a (80 mm 9 80 mm 9 25 mm) square shape with a 45 and 60 deg wall angle, respectively, and a (80 mm 9 80 mm 9 20 mm) square shape with a 70 deg wall angle. The trends of the FE simulation results agreed quite well with the experimental results. Finally, the effects of the process parameters, i.e., the tool down-step and tool radius, on the ductile fracture value and FLC at fracture (FLCF) were also investigated using the FE simulation results.

show abstract

Section: Duc-toan Nguyen Jin-gee Park and Young-suk Kimmentioning

confidence: 99%

Section: Duc-toan Nguyen Jin-gee Park and Young-suk Kimmentioning

confidence: 99%

Section: B Jc Model At Elevated Temperaturesmentioning

confidence: 99%

Section: B Jc Model At Elevated Temperaturesmentioning

confidence: 99%

See 2 more Smart Citations

Ductile Fracture Prediction in Rotational Incremental Forming for Magnesium Alloy Sheets Using Combined Kinematic/Isotropic Hardening Model

Nguyen

Park

Kim

2010

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…In particular, Park et al (2010) used the rotational tool to accelerate plastic deformation of magnesium forming using SPIF. During the rotational incremental forming process, a large amount of heat is naturally generated in the contact area due to friction energy at the tool-specimen interface and plastic deformation energy by shear deformation.…”

Section: Increased Process Capabilitymentioning

confidence: 99%

Process Investigation of Incremental Sheet Forming: The Evolution Towards Multi-Pass Deformation Design

Liu¹

View full text Add to dashboard Cite

Incremental sheet forming (ISF) is a promising sheet metal forming technology with high potential to shape complex three-dimensional parts. It is suitable for rapid prototyping as well as low volume production. The advantages of ISF technology are flexible, short product development time, inexpensive die/tooling and high formability in comparison to conventional sheet forming technologies. Although many contributions have been made on the development of ISF technology, unsatisfactory forming quality still hampers its use in industrial applications. The work in this thesis focuses on the development of ISF in terms of process investigation on formability, forming force, geometric accuracy, forming time and surface quality, multi-pass ISF modelling and its validation including SPIF (single point incremental forming with no forming die) multi-pass deformation design and AMINO TPIF (two point incremental forming with full forming die) multi-pass deformation design, which form two main parts of this thesis.The work in the first part of this thesis is focused on the process investigation including process formability, forming forces, geometric accuracy, forming time and surface quality.In particular, tensile tests were carried out to characterize the mechanical properties of AA7075-O aluminium alloy sheets with three different thicknesses. (i) Process formability.Groove tests were performed to evaluate the process formability in terms of the effect of tool type and size. Furthermore, the effects of tool path types with different incremental steps on the maximum forming angle as well as the successful forming height were evaluated to clarify their influences on process formability during a cone-forming process. Additionally, a fracture forming limit diagram was developed to give the design limits for strain. (ii) Forming forces. A finite element (FE) model was developed to evaluate the forming forces, strain behaviour and thickness distribution with a groove test using different forming tools. Experimental tests were then performed to validate the FE results.Additionally, the trends in forming forces were also analysed considering the influences of different draw angles, sheet thicknesses, step-down sizes and sheet orientation during a cone and pyramid forming process. (iii) Geometric accuracy. A study on the effect of step-down size on geometric accuracy was implemented, which is of great importance in design and control of a tool path to improve the forming quality. (iv) Forming time. Design of experiments (DOE) together with the Taguchi method was used to investigate the effects of process parameters (step over (the distance the forming tool moves over the Page I part surface to generate a spiral tool path), feed rate, sheet thickness and tool diameter) on forming time. It was concluded that the most significant process parameter influencing forming time is the step over followed by the feed rate. (v) Surface roughness. Surface integrity was evaluated during a groove test in terms of rolling and sliding f...

show abstract

Incremental Sheet Forming

Pérez‐Santiago

Bagudanch

García-Romeu

2019

Modern Manufacturing Processes

View full text Add to dashboard Cite

Study of Forming Limit for Rotational Incremental Sheet Forming of Magnesium Alloy Sheet

Cited by 46 publications

References 36 publications

Ductile Fracture Prediction in Rotational Incremental Forming for Magnesium Alloy Sheets Using Combined Kinematic/Isotropic Hardening Model

Ductile Fracture Prediction in Rotational Incremental Forming for Magnesium Alloy Sheets Using Combined Kinematic/Isotropic Hardening Model

Process Investigation of Incremental Sheet Forming: The Evolution Towards Multi-Pass Deformation Design

Incremental Sheet Forming

Contact Info

Product

Resources

About