Abstract
In order to investigate the formability of the granular medium forming (GMF) based on the Mohr–Coulomb constitutive model with the tri-axial compression test of granular medium and the true stress–strain curves of TA1 titanium alloy from uniaxial tensile tests, the numerical simulation of TA1 titanium alloy sheet deep drawing with finite element method was performed, and the deep drawing tests were also carried out. Simulation analysis and test results show that the GMF process is suitable for titanium alloy sheets and can effectively improve the uniformity of the wall thickness of the formed parts, reduce the tendency of wrinkles, and improve the forming quality.
Highlights
At present, with the wide application of lightweight components in aviation, aerospace, automobile, energy and other fields, more and more high requirements are put forward for the advanced forming technology of lightweight alloy thin-walled parts
Because the application of this process can fully exploit recent advances in the formability of lightweight materials at elevated temperatures, as well as overcome the limitations that the heat-resistant oil used in warm hydroforming operations can withstand temperatures of no more than 350◦C[10,11,12] and that the inert gas used at higher temperatures in hot pneumatic bulging processes usually causes leakage problems[13,14], the granular medium forming (GMF) process has recently attracted considerable attention by several researchers[15,16,17,18]
A sheet is placed on the concave die; The charging barrel is pressed on the sheet, playing the role of edge pressing and sealing; the granular medium is loaded into the charging barrel, and pressure is applied to the convex die block, so that the granular forming pressure under the pressure of the block, which are transferred to the sheet through the granular; The middle part of sheet firstly produce plastic deformation because it is subjected to the action of bidirectional tensile stress under the action of forming pressure, and the flange material gradually enters the die under the action of radial tensile stress, and the sheet is completely attached to the die and formed into the cavity shape of the die[5]
Summary
With the wide application of lightweight components in aviation, aerospace, automobile, energy and other fields, more and more high requirements are put forward for the advanced forming technology of lightweight alloy thin-walled parts. To study the formability of the GMF process, this paper takes cylinder-shaped parts as the research object, and carries out the simulation calculation and experimental verification of its forming process.
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