Feasibility study of cam-shaped tube production using elastomeric tool versus fluid forming method

Nosrati, Hasan Ghaforian; Gerdooei, Mahdi

doi:10.1007/s00170-017-1425-4

Cited by 11 publications

(5 citation statements)

References 6 publications

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“…Therefore, they require specialized equipment, which greatly increases the manufacturing cost of plate and shell components [9]. Rubber bulging is the use of rubber as a flexible force-transmitting medium to induce plastic deformation of metal plates and shells [10]. It has the advantages of a simple mold structure, no need for sealing, high versatility, and a short production cycle [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, researchers from various countries have conducted extensive studies on rubber bulging and granular medium bulging in flexible medium forming technology. Nosrati et al [10] compared the rubber bulging and hydroforming technology for cam-type 304 stainless steel tubes. The study showed that the hydroforming technology makes it easier to fill small radius molds than the rubber bulging technology.…”

Section: Introductionmentioning

confidence: 99%

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Study of plastic deformation and quality of flexible medium forming of bionic egg-shaped shell

sun,

Shi,

Shen

et al. 2024

Preprint

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Aiming at the problems of large deviation of plastic machining accuracy and different buckling instability loads of bionic egg-shaped shells under different flexible medium forming technologies, it is proposed to adopt unidirectional loading rubber bulging and granular medium bulging technologies of bionic egg-shaped shells. By comparing the plastic machining accuracy, geometric accuracy, and strength of bionic egg-shaped shells with different flexible mediums, the machining accuracy and overall quality of bionic egg-shaped shells can be improved. To explore the stress and strain conditions in different stages and regions of egg-shaped shell flexible medium forming technologies under the ideal condition of considering the thickness stress, the mechanical analysis of egg-shaped shell flexible medium forming technologies is carried out. The simulation analysis and experimental verification methods are used to analyze the forming process of egg-shaped shells with different flexible mediums and verify the accuracy of the numerical analysis model. Then, in order to master the influence of flexible medium forming technologies on the plastic deformation and quality of egg-shaped shells, the influence of different flexible medium forming technologies on the plastic machining accuracy, geometric accuracy, and strength of egg-shaped shells is researched. The study shows that the results of the numerical analysis of the egg-shaped shell flexible medium forming technology have an average error of no more than 11% with the test, and the numerical analysis model can be considered accurate. Moreover, the plastic machining accuracy of egg-shaped shell process parts and egg-shaped parts with granular medium is better than that of rubber medium. The maximum strain of the egg-shaped part is 4% higher than that of the rubber medium, and the maximum thinning rate is 13.9% smaller than that of the rubber medium. The geometric accuracy deviation of the egg-shaped part of the egg-shaped shell with the granular medium is 10% smaller than that of the rubber medium, and the process parts are also superior to the rubber medium. The buckling loads of the egg-shaped shell process parts with the granular medium are all higher than that of the rubber medium, and the buckling loads of the egg-shaped parts are slightly smaller than that of the rubber medium. However, taking into account the error of the egg-shaped shell flexible medium forming test, hydrostatic pressure test, and the overall buckling load distribution of the egg-shaped shell flexible medium forming process parts, it is considered that the overall strength of the egg-shaped shell with the granular medium is higher than that of the rubber medium.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of plastic deformation and quality of flexible medium forming of bionic egg-shaped shell

sun,

Shi,

Shen

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…This egg-shaped structure not only provides excellent pressure resistance but also distributes pressure evenly when subjected to external pressure. This improves overall stability [2][3][4][5]. Therefore, in deep-sea engineering, based on the design principle of the egg-shaped structure, scientists have proposed to apply the bionic eggshaped structure in engineering practice [6][7].…”

Section: Introductionmentioning

confidence: 99%

Influence of unidirectional loading pusher head structure on the deformation law of bionic egg-shaped shells in internal high-pressure bulging

Sun,

Shen,

Shi

et al. 2024

Int J Adv Manuf Technol

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A solid particle medium flexible bulging technology is proposed to solve the problems of low molding precision, poor stability, and uneven deformation that may occur when processing bionic egg-shaped shells by the traditional bulging process. By optimizing the mold parameters, such as the angle and height of the pusher head, the flow characteristics of the granular material are improved, resulting in improved machining accuracy and surface quality when molding egg-shaped plastic shells. In this paper, we utilize a ø0.8-1 mm yttria-stabilized zirconia ceramic bead to serve as a pressure-transfer medium during the granular media forming process. Several different shapes of pusher heads with cone angles of 45°, 60°, 75°, and 90° and heights of 10mm, 25mm, and 40mmwere designed and manufactured. The numerical model of simulation was verified by the analysis of strain inhomogeneity coefficient, and the maximum thinning rate at the apex of bulging of the egg-shaped test was measured and calculated. The results show that the maximum thinning rate at the apex of bulging is the largest for the pusher head with 45° cone angle and 25mm height, and the strain distribution is the most uniform and the expansion effect is the best. The study shows that the optimization of the process parameters of the pusher head shape can effectively improve the uniformity of the strain distribution and thickness distribution during the egg-shaped shell forming process, thus improving the machining accuracy of the plastic deformation of the bionic egg-shaped tube test piece.

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“…Furthermore, rubber with higher hardness can significantly reduce the thinning of the sheet, thus reducing the damage and improving the formability. Nosrat et al [16] investigated the feasibility of using the rubber bulging method to manufacture cam-shaped 304 stainless steel tubes and compared it with the hydroforming method. The results showed that the rubber bulging method could compete with hydroforming under the proper setting of technological variables.…”

Section: Introductionmentioning

confidence: 99%

Study on the mechanism of unidirectional loading rubber bulging of bionic egg-shaped shell

Shi

Sun

Shen

et al. 2023

Int J Adv Manuf Technol

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Aiming at the problems of complex processing technology, uneven deformation, and poor forming accuracy of multi-curvature positive Gaussian slewing egg-shaped shells, we propose using unidirectional loading rubber flexible medium bulging technology to improve the tube deformation distribution and enhance the processing accuracy of plastic forming of bionic egg-shaped shells. The optimization problems in the rubber bulging technology of nonhomogeneous deformation egg-shaped shells are explored by analyzing the structure and manufacturing method of egg-shaped shells. The simulation analysis and experimental verification methods are used to study the different technological parameters and forming accuracy of rubber bulging of egg-shaped shells under unidirectional loading and to master the deformation mechanism of rubber bulging of egg-shaped shell structural components under unidirectional loading. The study shows that optimizing technological parameters in unidirectional loading mode can effectively improve the uniformity of strain distribution and thickness distribution during the forming of egg-shaped shells, thus improving the processing accuracy of plastic deformation of bionic egg-shaped thin-walled parts. Furthermore, the simulation of the rubber bulging technology of the egg-shaped shell after the optimization of technological parameters is in good agreement with the experiment.

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Feasibility study of cam-shaped tube production using elastomeric tool versus fluid forming method

Cited by 11 publications

References 6 publications

Study of plastic deformation and quality of flexible medium forming of bionic egg-shaped shell

Study of plastic deformation and quality of flexible medium forming of bionic egg-shaped shell

Influence of unidirectional loading pusher head structure on the deformation law of bionic egg-shaped shells in internal high-pressure bulging

Study on the mechanism of unidirectional loading rubber bulging of bionic egg-shaped shell

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