Improvement of sheet metal formability by local work-hardening with punch indentation

Abe, Yohei; Mori, Ken-ichiro; Maeno, Tomoyoshi; Ishihara, Seiya; Kato, Yuki

doi:10.1007/s11740-019-00910-6

Cited by 10 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This process is also cost-effective because it is characterized by high production rates and gives finished parts of good quality without additional operations. Nowadays, for sheet metal components manufactured by deep drawing process, a more complex profile and higher formability are required [11][12][13][14][15]. The optimization of process parameters to enhance the formability of AA 5182 alloy in the deep drawing of square cups by hydroforming was carried out [11].…”

Section: Introductionmentioning

confidence: 99%

“…The influences of the deep drawing depth, initial specimen geometry, and bead height on formability were subsequently investigated by means of sensitivity analysis [12]. Abe et al proposed the technique of local work hardening with punch indentation to improve sheet metal formability [13]. The most important process parameter affecting thinning was the peak pressure, whereas the pressure path had the least effect on formability.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multi Draw Radius Die Design for Increases in Limiting Drawing Ratio

Phanitwong

Thipprakmas

2020

Metals

View full text Add to dashboard Cite

As a major sheet metal process for fabricating cup or box shapes, the deep drawing process is commonly applied in various industrial fields, such as those involving the manufacture of household utensils, medical equipment, electronics, and automobile parts. The limiting drawing ratio (LDR) is the main barrier to increasing the formability and production rate as well as to decrease production cost and time. In the present research, the multi draw radius (MDR) die was proposed to increase LDR. The finite element method (FEM) was used as a tool to illustrate the principle of MDR based on material flow. The results revealed that MDR die could reduce the non-axisymmetric material flow on flange and the asymmetry of the flange during the deep drawing process. Based on this material flow characteristic, the cup wall stretching and fracture could be delayed. Furthermore, the cup wall thicknesses of the deep drawn parts obtained by MDR die application were more uniform in each direction along the plane, at 45°, and at 90° to the rolling direction than those obtained by conventional die application. In the present research, a proper design for the MDR was suggested to achieve functionality of the MDR die as related to each direction along the plane, at 45°, and at 90° to the rolling direction. The larger draw radius positioned for at 45° to the rolling direction and the smaller draw radius positioned for along the plane and at 90° to the rolling direction were recommended. Therefore, by using proper MDR die application, the drawing ratio could be increased to be 2.75, an increase in LDR of approximately 22.22%.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi Draw Radius Die Design for Increases in Limiting Drawing Ratio

Phanitwong

Thipprakmas

2020

Metals

View full text Add to dashboard Cite

show abstract

“…IOP Publishing doi:10.1088/1757-899X/1284/1/012043 2 Furthermore, Abel et al investigated the formability of deep-drawn sheet metal components and found a positive effect for formability by selective embossing and reforming [5]. Walzer et al performed tensile tests with embossed tensile specimens made of the dual-phase steel (DP) DP600 and found an increase in tensile strength due to the embossing [6].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Mechanical Properties of Selectively Embossed Sheet Metal Materials Under Multi-Axial Loads

Heinzelmann

Briesenick

Liewald

2023

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

The application of embossed structures close to the sheet surface allows for work hardening to be introduced into sheet metal materials, leading to an improvement in their mechanical properties. So far, this was demonstrated in previous research work via tensile tests with differently embossed dual-phase steel specimens. Since tensile tests only reproduce uniaxial loading of the sheet metal material, no conclusions can yet be drawn about the property modification that can be achieved by near-surface embossing concerning real-life, multi-axial loading scenarios. To get deeper knowledge about the deformation behaviour of embossed components, it is important to consider multi-axial load cases. In the investigations reported in this paper, a multi-axial load case was realized by testing embossed bending specimens of DP600 and DP800 using a three-point bending device. The tests showed an overall improvement in the maximum bending force needed for the three-point bending test due to embossing of the materials investigated. Further, the tests indicated that lower-strength materials get more influenced by embossing than higher-strength materials. By simulating the process of embossing the bending specimens and the subsequent three-point bending test, an even deeper understanding of the material property modification could be generated.

show abstract