| CPC C22F 1/04 (2013.01) | 8 Claims |
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1. A method for forming a metal component using electric pulse creep aging, the metal component having a curved surface structure, and the metal component having an isosceles trapezoidal shape when the metal component is flattened, wherein the method comprises following steps:
step (1), providing a sheet material, and processing the sheet material into a sheet material to be formed having a preset shape, wherein the sheet material to be formed comprises a main body and two stepped parts, the main body has a same structure as a flattened form of the metal component, the main body in the isosceles trapezoidal shape has a top surface corresponding to a shorter one of two parallel sides of the isosceles trapezoidal shape, a bottom surface corresponding to a longer one of the two parallel sides of the isosceles trapezoidal shape, and two slanted sides between the top surface and the bottom surface, and the two stepped parts are symmetrically arranged and located on the slanted sides of the main body, each of the stepped parts comprising a plurality of stepped platforms arranged parallel to the bottom surface of the main body, and two stepped platforms are in a same plane as the top surface of the main body, wherein all the stepped platforms and the top surface of the main body together form M installation ends of different heights, and M is a positive integer greater than or equal to 2;
step (2), providing a plurality of first wires and a plurality of second wires, a total number of the first wires being the same as a total number of the second wires; and dividing all the second wires into M groups of second wires based on cross-sectional areas of the M installation ends such that each unit cross-sectional area of each installation end has a same number of second wires;
step (3), installing the sheet material to be formed on a flexible mold, and connecting one end of each of the plurality of first wires to the bottom surface of the main body and connecting the other end of each first wire to a current cabinet, and connecting one end of each second wire in each group of second wires to the corresponding installation end and connecting the other end of each second wire to the current cabinet, wherein the plurality of first wires and the plurality of second wires are respectively arranged opposite to each other and are evenly distributed;
step (4), turning on a power supply, applying electric pulses to M installation ends respectively, so that a current flows from one end of the sheet material to be formed to the other end of the sheet material to be formed to heat the sheet material to be formed, each area of the M installation ends having a regular shape and a current density applied to each area is the same; wherein in the step (4), electric pulses are applied to the M installation ends in a staggered manner, and when the electric pulses is applied to a target area, no electric pulses is applied to other areas, and a sum of the duty cycle of the pulse current applied to each area is less than 100%, wherein the target area is any one of the M installation ends, and the other areas are all areas of the M installation ends excluding the target area;
step (5), when the temperature of the sheet material to be formed reaches a creep aging temperature, adjusting the flexible mold to form a target mold surface, the target mold surface matching a shape of the metal component;
Step (6), maintaining a temperature generated by a load and the electric pulses for a preset time length to allow the sheet material to be formed to undergo a creep aging forming, and unloading the load and the current that is applied, and obtaining the metal component including an edge material after a rebound.
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