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.

Method and apparatus for hydroforming multiple components with reduced press loading

Abstract: Apparatus and method for hydroforming multiple components simultaneously with a smaller capacity press than would be possible using conventional hydroforming methods and apparatus. Die pairs are positioned with multiple die cavities in series so that the separating force transmitted to a press holding the dies equals the force developed in a single die cavity, even though multiple components are being formed in the die cavities.

Developments in Sheet Hydroforming for Complex Industrial Parts

Abstract: Among the various sheet-metal forming processes, hydroforming is one of the nontraditional ones. This process is also called hydromechanical forming, hydraulic forming or hydropunch forming. In hydroforming process, liquid is used as the medium of energy transfer to form the workpiece. The part is formed on a female die, with the liquid under pressure acting in place of a conventional solid punch [1].

Hydroforming of superconducting tesla cavities

Abstract: Seamless fabrication of single-cell and multi-cell TESLA shape cavities by hydroforming has been developed at DESY. The forming takes place by expanding the seamless tube with internal water pressure while simultaneously swaging it axially. Tube radius and axial displacement are being computer controlled in accordance with results of FEM simulations and the experimentally obtained strain-stress curve of tube material. Several Nb single cell cavities have been produced. A first bulk Nb double cell cavity has been fabricated. The Nb seamless tubes have been produced by spinning and deep drawing. Surface treatment such as buffered chemical polishing, (BCP), electropolishing (EP), high pressure ultra pure water rinsing (HPR), annealing at 800°C and baking at ca. 150°C have been applied. The best single cell bulk Nb cavity has reached an accelerating gradient of Eacc>42 MV/m after ca. 250µm BCP and 100µm EP. Several bimetallic NbCu single cell cavities of TESLA shape have been fabricated. The seamless tubes have been produced by explosive bonding and subsequent flow forming. The thicknesses of Nb and Cu layers in the tube wall are about 1 mm and 3mm respectively. The RF performance of NbCu clad cavities is similar to that of bulk Nb cavities. The highest a ccelerating gradient achieved was 40MV/m after ca.180µm BCP, annealing at 800°C and baking at 140°C for 30 hours. The degradation of the quality factor Qo after repeated quenching is moderate, after ca. 150 quenches it reaches the saturation point of Qo = 1,4x10 10 at low field. This indicates that on the basis of RF performance and material costs the combination of hydroforming with tube cladding is a very promising option.

Research on the effect of flow stress calculation on aluminum alloy sheet deformation behavior based on warm bulging test

Abstract: Confirmation of material properties is an important research area for determining metals deformation behavior. In order to research the effect of flow stress calculation on aluminum alloy sheet deformation behavior, warm sheet bulging test was carried out to obtain bulging height - pressure curves with different bulging heights and diameters in this study. Based on the bulging parts profile data measured by three coordinate measuring machine, the least square circle fitting radius were fitted. Existing theoretical models for radius of curvature and thickness were compared and best models were selected to obtain more accurate stress — strain curves by calculating the bulging flow stress. Combination model was used to calculate the bulging height — pressure curves obtained by bulging test and the stress-strain curves with different temperatures and pressure rates were obtained. A monotonous increasing function was resulted which is of great significance in the area of formability and deformation behavior of warm sheet hydroforming.