Hydroforming

About: Hydroforming is a research topic. Over the lifetime, 2796 publications have been published within this topic receiving 26293 citations. The topic is also known as: Bulge forming.

Loading path optimization of T tube in hydroforming process using response surface method

Abstract: In this paper, the 3D drawing software UG is used to establish the geometric modeling of T tube for hydroforming process, and the software DYNAFORM is used to simulate the forming performance of T-shaped tube under different loading paths to obtain the simulation value of forming performance parameters. Next, the response surface method is used to analyze the influence of the main factors on hydroforming formability. The loading path, including axial feeding, internal pressure, and backward displacement, and friction coefficient are included in the main factors; the minimum thickness value, the height of branch tube, and the radius of limiting circle angle are considered as important characteristics that govern the forming performance. According to the optimization evaluation criteria, the perturbation plots and the interaction effect of different test factors, the main factors are optimized, and the best value of loading path was selected. Finally, the comparison of simulation and experiment under the optimal loading path shows that the error between experiment and simulation is within 5%, indicating that the loading path optimization method has high accuracy and good feasibility.

Metallic sheet hydroforming method, forming die, and formed part

Abstract: A sheet hydroforming method is disclosed wherein two stacked metallic sheets are clamped between a pair of upper and lower dies 10, 11 and a fluid is introduced and pressurized between mating surfaces of the metallic sheets, causing the metallic sheets to bulge into a space defined by die cavities 10 b and 11 b A thru-hole 11 d for introducing the fluid is formed in one of the dies so as to lead to a holding surface of the die, while a pierced hole for introducing the fluid is formed in one of the metallic sheets in a portion of the one metallic sheet which portion is in contact with a holding surface 10 a ( 10 b) of one of the dies, the pierced hole being positioned with the thru-hole 11 d, then the fluid is introduced in a pressurized state between mating surfaces of the metallic sheets from the thru-hole through the pierced hole, thereby causing the metallic sheets to bulge According to this method, a pressurized fluid can be introduced between the mating surfaces of blanks easily without leakage of the fluid Not only the efficiency of the sheet hydroforming method but also the dent resistance of a formed part can be improved

Multi-objective optimization of loading path design in multi-stage tube forming using MOGA

Abstract: Pre-bending is a critical process required prior to hydroforming. The bending has an effect on the tube thickness and strain which will use up a portion of the formability of the as-received tube. To compensate for this loss of formability, a multi-objective optimization method was applied to improve the hydroforming process after pre-bending. A multi-objective genetic algorithm (MOGA) and Kriging surrogate model were used to optimize the loading path. The Kriging model was used to replace the finite element simulation in constraint handling. The optimal loading parameters in the hydroforming process were obtained for a tube that was previously bent 90°, and showed an improvement in reducing the corner radii of the part at the extrados and intrados of the bend (8.73 mm and 11.24 mm for the extrados and intrados of the bend, respectively). The corresponding corner fill expansion (CFE) was improved by 16.7% (or 1.79 mm) compared to the maximum expansion of 10.73 mm obtained experimentally.

Method to produce a turbomachine blade

Abstract: The invention relates to a method of manufacturing a blade of a turbomachine, in particular of a gas turbine engine, which consists of a metallic enveloping structure and a suitable within this provided and the containment structure connected to the supporting structure made of a composite material. In this case, is welded onto a sheet, the wrap structure forming a metal felt fabric, or soldered, after which this sheet-fabric unit is formed by hydroforming or an internal high-pressure forming process to the blade-shell structure. Finally, the support structure forming the composite material is introduced into the cavity of the casing structure. When using a reinforced by long fibers composite material thereby a fiber structure can first be inserted into the blade-shell structure, and thereafter the composite material are introduced by the high-pressure infiltration, wherein the wrap structure preferably said deforming is carried out in a mold, in which by an internal high-pressure forming process, is located.