The study of forming concave-bottom cylindrical parts in hydroforming process

Salahshoor, Masoomeh; Gorji, Hamid; Bakhshi-Jooybari, Mohammad

doi:10.1007/s00170-015-6908-6

Cited by 18 publications

(5 citation statements)

References 9 publications

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“…After the pre-bulge stage, the pressure was linearly increased (path AB) to a maximum value (path BC). The slope of this path depends on different parameters such as the punch velocity, sheet thickness and punch profile bottom [14]. The punch speed is about 20 mm/s.…”

Section: Methodsmentioning

confidence: 99%

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Investigation of a Modified Hydrodynamic Deep Drawing Assisted by Radial Pressure with Inward Flowing Liquid Process

et al. 2018

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Hydrodynamic Deep Drawing (HDDRP), the combination of hydroforming and conventional deep drawing, accommodates the advantages of the two processes. A technique, called HDDRP with inward flowing liquid, has been introduced based on the idea of insertion of radial pressure around the blank rim. The radial pressure created on the blank edge, can increase the drawing ratio. Thus, increasing the radial pressure to an amount greater than the cavity pressure, and independent control of these pressures is the basic idea of this research for forming cylindrical parts. To perform the experiments, two independent pumps were used to provide the two pressures independently. The pressure supply system and the die set were designed in a way that provides simultaneous control of the pressures throughout the process. Then, the effects of radial pressure paths on thickness distribution of cylindrical St13 cups were investigated. In addition, a comparison between HDDRP and HDDRP with inward flowing liquid processes has been performed experimentally. Results indicated that using a higher radial pressure than the cavity pressure and controlling their values at any moment of the process enhances the thickness distribution of the formed part in all regions.

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Section: Methodsmentioning

confidence: 99%

“…Thus, the Hill yield criterion was used to define anisotropic yielding [13]. The friction coefficient was assumed to be 0.14 between the sheet and punch surface but for other surfaces, it was considered 0.04 [14]. The contact algorithm between the sheet and die components, was modeled as penalty method based on Coulomb law.…”

Section: Process Simulationmentioning

confidence: 99%

Investigation of a Modified Hydrodynamic Deep Drawing Assisted by Radial Pressure with Inward Flowing Liquid Process

et al. 2018

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“…In this context, the main concerns are technological parameters such as the forming fluid pressure, closing pressure, shape of die, friction, workpiece material, etc. [3,[13][14][15][16][17][18][19]. Among them, a large amount of research on forming liquid pressure parameters has been published to determine their influence on the forming process and product quality [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Experimental Modeling of Pressure in the Hydrostatic Formation of a Cylindrical Cup with Different Materials

Nguyen

Bui

2021

Applied Sciences

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Forming complex sheet products using hydrostatic forming technology is currently a focus of the majority of forming processes. However, in order to increase stability during the forming process, it is necessary to identify and analyze the dependency of the forming pressure and the quality of a product on input parameters. For the purpose of modeling the forming pressure, this paper presents empirical research on the product of a cylindrical cup made of various materials, including carbon steel (DC04), copper (CDA260), and stainless steel (SUS 304) with different thicknesses (0.8 mm, 1.0 mm, and 1.2 mm), under a defined range of binder pressures. The regression method is selected to formulate an equation that shows the relationship between the input parameters, including the materials (ultimate strength and yield stress), workpiece thickness, binder pressure and the output parameter, and the formation of fluid pressure. The mathematical equation allows us to determine the extent of the effect of each input on the forming pressure. The experimental results can be used for the easier planning and forecasting of the process and product quality in hydrostatic forming.

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“…9 This process uses pressurized and heated hydraulic fluid to form thermoplastic composites against a punch of desired shape. 10,11 The main advantage of this process over other forming techniques is that the fluid pressure acts uniformly over the entire composite surface, reducing out of plane wrinkling, and producing multilayer composite structures with uniform thickness and properties. 12–14 Zampaloni demonstrated the ability of the composite sheet hydroforming process to form kenaf reinforced polypropylene natural composites, 15 randomly oriented glass fiber composites, and woven glass fiber composites.…”

Section: Introductionmentioning

confidence: 99%

Mechanical analysis of thermo-hydroforming of a fiber-reinforced thermoplastic composite helmet using preferred fiber orientation model

Ahn

Kuuttila

Pourboghrat

2018

Journal of Composite Materials

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The composite thermo-hydroforming process, utilizing heated and pressurized fluid, was used to form an advanced helmet with the Spectra Shield. Experimental results obtained from the forming process show that thermo-hydroforming is a feasible process for manufacturing thermoplastic composite materials. Concurrent to the forming experiments, the forming process was numerically modeled using ABAQUS/CAE. The behavior of the fiber reinforced polymer composite was modeled using the Preferred Fiber Orientation model, which was implemented into the explicit finite element code ABAQUS by writing a User Material Subroutine. The preferred fiber orientation model was further adapted to work with a composite laminate consisting of multiple layers. Numerical results were compared with experimental data to validate the method in terms of predicting the deformed geometry of the multilayer composite, wrinkling, as well as the punch force–displacement curve. Overall, the deformed shape of the fiber-reinforced thermoplastic composite helmet, including the distribution of wrinkles were predicted accurately.

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The study of forming concave-bottom cylindrical parts in hydroforming process

Cited by 18 publications

References 9 publications

Investigation of a Modified Hydrodynamic Deep Drawing Assisted by Radial Pressure with Inward Flowing Liquid Process

Investigation of a Modified Hydrodynamic Deep Drawing Assisted by Radial Pressure with Inward Flowing Liquid Process

Experimental Modeling of Pressure in the Hydrostatic Formation of a Cylindrical Cup with Different Materials

Mechanical analysis of thermo-hydroforming of a fiber-reinforced thermoplastic composite helmet using preferred fiber orientation model

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