When forming a branch part such as a hydraulic manifold, it is required to evenly distribute the wall thickness of the formed part to improve the service life of the part; and a certain height of the formed branch is required for subsequent processing. For the shape-determining parts, the main factors affecting the forming are the tube blank material and the forming process conditions. The effects of tube strain strengthening index value and anisotropy coefficient r value on the moldless free bulging of the pipe were studied. The part is long in the axial deformation zone but the bulging height is not high. Research on thin-walled twigs with short deformation zones and high forming heights is still rare. In this paper, the hydroforming of branch-type tube is studied by experiment and numerical simulation, and the influence of process anisotropy coefficient r value, strain enhancement index n value, loading path and friction coefficient on the forming branch height and wall thickness is analyzed.
T-tube hydroforming must obtain a certain branch height. Cracking and wrinkling are common failure modes in forming. The cracking is usually accompanied by severe thinning of the wall thickness, and the local wall is severely thickened during wrinkling. The hydroforming performance of the T-tube was evaluated by the minimum wall thickness of the branch pipe, but it could not reflect the forming height of the branch pipe; the sensitivity of the hydroforming to the parameters was evaluated by the bulging height, but the influence on the wall thickness could not be reflected. The higher the height of the forming branch of the pipe, the more uniform the thickness distribution of the pipe wall, the better the hydroforming performance of the T-tube. This paper proposes a comprehensive evaluation index for the hydroforming performance of the T-tube: h is the height of the forming pipe before the pipe is broken ;t is the maximum and minimum thickness of the wall after forming. When the wall thickness is maximally reduced to 20 at the initial wall thickness, the tube is broken. The larger the f value, the better the forming properties.
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