Abstract
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.
Highlights
1.1.IntroductionThestrong strongdevelopment developmentofofautomotive automotiveand andmachine machineindustries industriesover overthe thepast pastdecades decadesThe has required advanced manufacturing techniques, especially for thin-shell products.has required advanced manufacturing techniques, especially for thin-shell products
Thu N.T. et al studied the influence of working pressure on the product quality in the hydrostatic formation of DC04 materials [28,29]
This paper provides an analysis of the forming process of a typical cylindrical cup in hydrostatic forming with three types of materials—steel (DC04), copper (CDA260), and stainless steel (SUS 304) at different thicknesses (0.8 mm, 1.0 mm, 1.2 mm)—within the binder pressure range of 80~115 bar
Summary
The has required advanced manufacturing techniques, especially for thin-shell products. Their study built a mathematical relationship between the working fluid pressure and the thickness of steel and aluminum in the hydrostatic forming process for pairs of welded sheets. The influence of technological parameters on product quality was studied in the work of Fitsum et al [12]. These authors demonstrated that the formability of high-strength cryo-rolled Al alloy sheets could be enhanced by hydroforming. Thu N.T. et al studied the influence of working pressure on the product quality in the hydrostatic formation of DC04 materials [28,29]. The formula allows for the analysis of the influence of each input variable (binder pressure, thickness of material, and ratio of stress (ultimate strength per yield stress)) on forming pressure
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