Titanium alloy sheet electric auxiliary segmentation progressive forming device and method

Abstract

The invention relates to a titanium alloy sheet electric auxiliary segmentation progressive forming device and method. The device comprises a concave mold, a convex mold and a pulse power source. Theconcave mold and the convex mold are connected with the pulse power source, and the concave mold is wider than the convex mold; in the working process, the device is installed on a press, the length of a sheet is larger than the width of the concave mold, the sheet is placed between the concave mold and the convex mold, output current of the high-energy direct current pulse power source flows through the convex mold, the sheet and the concave mold to form a loop, and the sheet is subjected to segmentation progressive heating forming. Compared with the prior art, the high-energy direct currentpulse power source is adopted to directly heat a forming blank, heating of the whole set of mold is not needed, the heating speed is high, influences of heating on performance deterioration and surface oxidation on the titanium alloy sheet are reduced, the forming property of the titanium alloy sheet is improved, and springback after forming of the titanium alloy sheet is reduced; and combined with a segmentation progressive forming process, a large-scale titanium alloy thin-walled member can be formed, and the requirements of helicopter paddles to the titanium alloy overall edging can be met.

Description

technical field [0001] The invention relates to a titanium alloy thin plate forming device and method, in particular to a titanium alloy thin plate electrically assisted segmental progressive forming device and method. Background technique [0002] Titanium alloy has become a commonly used material in aerospace because of its high specific strength, high temperature resistance, corrosion resistance and other excellent properties. Helicopter rotor blades are increasingly made of composite materials, but composite material blades are prone to delamination and damage when impacted, so it is necessary to wrap the leading edge of the blade. The weight and corrosion resistance of the leading edge wrapping of the blade have a great influence on the service life of the blade. It has become a development trend to use titanium alloy instead of stainless steel as the leading edge wrapping material of the helicopter blade. Titanium alloys have poor room temperature plasticity, and room...

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Problems solved by technology

A search for the forming method of metal edge wrapping of composite materials found that Xie Lansheng of Nanjing University of Aeronautics and Astronautics et al. carried out edge forming on TB8 titanium alloy at 625°C, and kept it warm for 10 minutes, which has a small amount of springback. This method requires overall heating of the mold. High energy consumption, long forming cycle, and severe oxidation of parts (research on the manufacturing process of iron-clad blade leading edge, master's thesis of Nanjing University of Aeronautics and Astronautics, 2013)

Ma Xiaojian and others proposed an electrolytic forming method for metal edge wrapping of composite blades (application publication number CN104404613A), but this method has defects such as long forming time and low material utilization rate

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