Study on formability of tube hydroforming through elliptical die inserts

Li, Shuhui; Chen, Xianfeng; Kong, Qingshuai; Yu, Zhongqi; Lin, Zhongqin

doi:10.1016/j.jmatprotec.2012.04.016

Cited by 24 publications

(9 citation statements)

References 17 publications

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“…The method proposed in Li et al 86 resembles the bulging of a sheet through elliptical dies. Recall that this is a way to deform the material along different loading paths.…”

Section: Thfmentioning

confidence: 99%

Recent developments in hydroforming technology

Lee

Korkolis

Kim

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article is the review of hydroforming technologies that have been used increasingly in various industries including automotive applications. General concepts and technological developments in tube hydroforming and sheet hydroforming are presented with recent research and development activities. Then, the theoretical background associated with the plasticity and constitutive laws and their implementation to the computational modeling of the hydroforming process are discussed.

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“…The method proposed in Li et al 86 resembles the bulging of a sheet through elliptical dies. Recall that this is a way to deform the material along different loading paths.…”

Section: Thfmentioning

confidence: 99%

Recent developments in hydroforming technology

Lee

Korkolis

Kim

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Regarding the same report, they obtained the left-hand side FLD using a classical free hydroforming tool set, and the right-hand side FLD via the novel device to simultaneously give the lateral compression force and the internal pressure to control the material flow [25]. Furthermore, Lin et al proposed a novel experimental device by partially bulging a tube at the upper elliptical opening to evaluate the right side FLD and could obtain the forming limit strains at the weld line and the opposite region of the tube [26]. Magrinho et al obtained multiple strain paths in both sides of the FLD using three kinds of tests: a uniaxial tensile test of a specimen cutout from a tube, a tube expansion test of the tube end with a rigid punch, and a rubber pressured free bulge test using a digital image correlation system (DIC) [27].…”

Section: Introductionmentioning

confidence: 99%

“…Since welded steel tubes, which are frequently used for parts of automobiles, have a different hardness between the weld and the base metal caused by the thermal treatment, it is necessary to evaluate the weld and the base metal, respectively. However, there is no test of the tube to evaluate a designated location, except those by Shirayori et al [23] and Lin et al [26]. Most biaxial tube formability evaluation tests require expensive special equipment for hydraulic loading, sealing, and axial loading, excluding a conical flaring test and rubber bulge test.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it is important to check the linearity of the strain path because the forming limit curve (FLC) is changed depending on the strain path. Chen et al and Lin et al measured strain paths using each test method [25,26]. However, these methods have problems caused by stopping the test, such as the effect of unloading, the length of the test time, and damage to the specimen.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Local One-Sided Rubber Bulging Test to Measure Various Strain Paths of Metal Tube

Yoshimura

Nakahara

Otsu

2021

Metals

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We proposed a local one-sided rubber bulging method of metal tubes to evaluate various strain paths at an aimed portion and measured the forming limit strains of metal tubes at the place of the occurrence of necking under biaxial deformation. Using this method, since rubber is used to give pressure from the inner side of the tube, no sealing mechanisms were necessary unlike during hydraulic pressure bulging. An opening was prepared in front of the die to locally bulge a tube at only the evaluation portion. To change the restriction conditions of the bulged region for biaxial deformation at the opening, a round or square cutout, or a slit was introduced. The test was conducted using a universal compression test machine and simple dies rather than a dedicated machine. Considering the experimental results, it was confirmed that the strain path was varied by changing the position and size of slits and cutouts. Using either a cutout or a slit, the strain path in the side of the metal tubes can be either equi-biaxial tension or simple tension, respectively. Additionally, by changing the size of the cuts or slits, the strain path can be varied.

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“…Some scholars have used numerical simulation methods to study the internal pressure forming of tee. 9–11 Other scholars used numerical simulation methods to study the causes of failures such as necking and cracking in hydroforming. 12–14 T.F.Kong et al.…”

Section: Introductionmentioning

confidence: 99%

External high-pressure forming of metal spiral tube of equal wall thickness

Shi

Deng

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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Positive displacement motors are widely used underground power tools in oil and gas extraction. In order to solve the problems of the short life of the conventional positive displacement motor and the difficulty of machining the constant wall positive displacement motor, this paper proposes a metal bush stator. Based on theoretical analysis and tensile experiment of 304 stainless steel, a finite element model of an external high-pressure forming equal-wall-thickness metal spiral tube was established. The finite element method is used to study the external high pressure forming spiral tube with equal wall thickness. According to the results of the numerical simulation, we choose the tube blank with the inner diameter of 88 mm×the wall thickness of 3 mm for the experiment of external high pressure forming spiral tube. The result of the experiment is that the inner and outer surfaces of the metal spiral tube are smooth, and the spiral tube has no wrinkles or cracks. The maximum gap between the spiral tube and the mold is 0.12 mm, and the inner surface of the spiral tube is close to the mold. The maximum gap are at the transition of convex arc and concave arc. The minimum wall thickness and the maximum wall thickness of the spiral tube are 2.6 mm and 3.205 mm, respectively. The quality of the spiral tube is better when the inner circumference length of the tube (D2)/the contour line circumference (D1) of the mold is 0.974. The experimental results are in good agreement with the numerical simulation results. We have designed an assembled mold, which can be removed smoothly after the experiment. The research results of this paper have important engineering significance for improving the working performance of positive displacement motors.

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Study on formability of tube hydroforming through elliptical die inserts

Cited by 24 publications

References 17 publications

Recent developments in hydroforming technology

Recent developments in hydroforming technology

Local One-Sided Rubber Bulging Test to Measure Various Strain Paths of Metal Tube

External high-pressure forming of metal spiral tube of equal wall thickness

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