Electric auxiliary bending forming process method for high-temperature titanium alloy grid rib wall plate

Abstract

The invention discloses an electric auxiliary bending forming process method for a high-temperature titanium alloy grid rib wall plate. The method comprises the following steps that a high-temperaturetitanium alloy thick plate is milled into a planar grid rib wall plate; two electrodes connected with a pulse current generator are used for conducting contact edge pressing on the two ends of the planar grid rib wall plate respectively; the pulse current generator carries out self-resistance heating on the planar grid rib wall plate through the electrodes; a bending male die is controlled to move downwards to bend the planar grid rib wall plate; and after the planar grid rib wall plate is formed into a designed geometrical shape, the pulse current generator is shut down. According to the electric auxiliary bending forming process method, the idea of pulse current auxiliary forming is applied to the overall forming process of the high-temperature titanium alloy grid rib wall plate, the formability of the high-temperature titanium alloy grid rib overall wall plate is expected to be improved through the material self-resistance heating effect and the electroplastic effect, and the integrated and accurate control over the formability of the high-temperature titanium alloy grid rib overall wall plate is achieved through the electric field-thermal field-force field cooperative control.

Description

technical field [0001] The invention relates to the technical field of titanium alloy grid rib wall plate processing, in particular to an electric-assisted press-bending process method for high-temperature titanium alloy grid rib wall plate. Background technique [0002] High-temperature titanium alloys generally refer to titanium alloys with a service temperature higher than 350 ° C. They are mostly used in the manufacture of high-temperature resistant parts such as aerospace engine parts and heat shields. They need to have good thermal strength, plasticity, toughness, creep performance and fatigue performance. Matching, high oxidation resistance and tissue stability at service temperature. Medium and high temperature long-term creep and durability are characteristic indicators of high-temperature titanium alloys. High-temperature titanium alloys are divided into two categories: traditional titanium alloys with solid solution strengthening as the main strengthening method ...

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Problems solved by technology

However, since most high-temperature titanium alloys are non-aging-strengthened alloys, the processing temperature is high, the processing window is narrow, and the amount of springback after deformation is large, the overall wall panel parts of the grid ribs are formed by conventional cold deformation or warm deformation methods. The tonnage requirements are high, and forming defects such as cracking at the rib root, instability and deformation at the upper end of the rib, and out-of-tolerance are prone to occur during the forming process, and the final forming dimensional accuracy is difficult to guarantee; adopt the integral chemical milling method or the method of skin welding and reinforcing ribs to form , the utilization rate of materials is extremely low, and it is easy to cut off the metal flow line, resulting in unreasonable flow lines at key stress positions, and introducing residual deformation and welding defects

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