Research on Multi-head Stretch Forming Technology of Sheet Metal

Chen, X.; Li, M.Z.; Fua, W.Z.; Feng, Peng

doi:10.1109/icece.2010.720

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…Later, Li et al 23 proposed a forming process of multi-gripper flexible stretch forming (MGFSF), in which Pascal's law of multi-cylinder hydraulic system, strain hardening, and minimal resistance force of the material are employed. 24,25 Wrinkling or the problem of conformability of sheet metal to the desired shape is prone to occur when forming workpieces with small transverse curvature radius, since the sheet metal in MGFSF conforms to the shape of the forming die under longitudinal tension and transverse compression of itself. Therefore, although MGFSF has been used successfully in producing large skin parts with medium curvatures, it is inapplicable to produce large skin parts with small or complex curvatures.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation for the flexible stretch-stamp forming process of sheet metal

Wang

Liu

2019

Advances in Mechanical Engineering

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Flexible stretch-stamp forming is a sheet metal forming method derived from flexible stretch forming and multi-point forming, aimed at solving wrinkling defects of large skin parts especially with complex curvatures, prone to occur in the later type of forming processes. To help understand the forming principle and forming characteristics of flexible stretchstamp forming, a large sheet metal part with wavelike surface was selected as the study object and extensive numerical simulations have been conducted using a general commercial finite element software. The main processing parameters of pre-stretching force and wrapping force, respectively, exerted by horizontal and sloping cylinders on forming quality were investigated in detail. Finally, experiments were conducted to estimate the forming performances of flexible stretch-stamp forming.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation for the flexible stretch-stamp forming process of sheet metal

Wang

Liu

2019

Advances in Mechanical Engineering

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“…In the authors' previous works, Li et al studied the MGFSF machine and explained the application of this technology [1]. Chen et al investigated the effects of the length of the transition zone, the gripper number and the clamping mode on the forming results, and pointed out that the sheet metal can get the desired shape with a shorter transition zone than the traditional stretch forming which not only increased the material utilization but also improved the forming quality [2][3][4]. Peng et al investigated two types of MGFSF machine using finite element method, and pointed out that the sheet metal can be shaped with a shorter transition zone with the front drawing type compared to the back drawing type [5].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Loading Path on Forming Results in Multi-Gripper Flexible Stretch Forming

Wang

Liu

2014

AMM

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Multi-gripper flexible stretch forming (MGFSF) is a recent technological innovation of sheet metal flexible forming process. Straight jaws in traditional stretch forming machine are replaced by a pair of opposed clamping mechanisms which can move relative to each other. Taking the case of forming a sheet metal into spherical surface by stretching the sheet in two opposite directions, the finite element models of MGFSF under various loading paths were established and the effects on stretch amount, strain and thickness of the simulated parts were analyzed comparatively. It is founded that compared to the horizontal-tilting (HT) and horizontal-vertical (HV) loading paths, the horizontal-tilting-vertical (HTV) loading path would result in more uniform stretch amount, strain and thickness distributions also with lower strain and thickness reduction, which improves the forming quality significantly. Finite element simulations also revealed that the material flow state in the transition zone can be improved effectively and the local strain concentration can be greatly suppressed with reasonable loading path, which would decrease the possibility of material failure.

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“…In order to solve this problem, adjustable clamp stretching machine was developed by ACB of France [8], but the machine needs to manually adjust the arc of sub-clamp based on the shape of stretching die, which leads to low forming precision and efficiency. So, a new type of flexible clamp stretch forming (FCSF) machine was designed by Dieless Forming Technology Center of Jilin University [9], which use discrete grippers substitute for integral structure grippers. The purpose of this paper is to investigate and understand the character of flexible clamp multi-point stretch forming (FCMPSF).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Flexible Clamp Multi-Point Stretch Forming

Peng¹,

Li²,

Cheng³

et al. 2014

AMM

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The finite element model of flexible clamp multi-point stretch forming (FCMPSF) was set up, and extensive contradistinctive analysis of forming limit and forming accuracy between FCMPSF and RCMPSF were done. The results show that under the same forming conditions, spherical part formed by FCMPSF is not easy to fracturing, dimpling and springback, and is easy to fit the die. The reason for this was analysed. The non-fracturing limited graph, the non-dimpling limited diagram and the average springback value of spherical parts formed by FCMPSF and RCMPSF were obtained. Finally, the forming experiment and error analysis of spherical part formed by FCMPSF were done, the results indicate that 3D parts with large transversal curvature can be shaped by FCMPSF and the forming quality was guaranteed.

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Research on Multi-head Stretch Forming Technology of Sheet Metal

Cited by 7 publications

References 5 publications

Numerical investigation for the flexible stretch-stamp forming process of sheet metal

Numerical investigation for the flexible stretch-stamp forming process of sheet metal

The Effect of Loading Path on Forming Results in Multi-Gripper Flexible Stretch Forming

Numerical Investigation of Flexible Clamp Multi-Point Stretch Forming

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