Air pressure loading based vibration creep combined incremental age forming method and device

Abstract

The invention discloses an air pressure loading based vibration creep combined incremental age forming method and device. The method is characterized in that a die surface is constructed in real timethrough an adjustable height multi-point type tool head based on the optimized incremental forming route, and the air source is adjusted to change the air pressure, so that a rib sheet can be clung tothe constructed die surface in each time; a special temperature control box is used for performing vibration creep combined incremental age forming on the rib sheet after being clung each other, andthe forming is finished after the rebound rate delta K / H of the forming surface is not beyond epsilon, and the forming surface is finally obtained. According to the method, a deformable curved surface is constructed in real time, and low-frequency vibration is caused so as to realize incremental forming and shape property adjusting and controlling of the rib sheet in age forming, thus multi-die processing, mounting and debugging processes can be avoided; the inner dislocation quantity of the material is increased and the crystal grains are enhanced while inner stress in formation is released,and as a result, the purposes of reducing the age time, decreasing the rebound rate, improving the crystal grain distribution uniformity and improving the size stability of the rib sheet can be achieved.

Description

technical field [0001] The invention belongs to the technical field of aging forming of metal plate parts, and relates to a method and device for forming a curved surface of a rib plate part, more specifically, a method and device for vibration creep composite aging progressive forming based on air pressure loading, especially It is suitable for rapid, precise and high-quality forming of large ribbed parts, thin plate parts or complex curved surface components. Background technique [0002] Rib parts are widely used in parts of aircraft, automobiles, high-speed rail and other products. Creep aging forming is a one-time forming technology, which is a method to obtain the corresponding shape and performance by using the creep deformation of the rib plate. Compared with the traditional forming method, the creep aging forming method can reduce the crack formation rate, improve the forming accuracy and corrosion resistance of the plate. However, this technology cannot convert a...

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Problems solved by technology

[0003] In order to solve the problems of long aging forming time of rib parts, many times of mold trials, large amount of springback after forming, uneven distribution of internal stress, incomplete elimination of residual stress, large grain size, etc., the present invention provides a method based on air pressure. The method and device of loaded vibration-creep composite aging progressive forming, according to the SVR support vector machine theory and springback compensation principle, optimize the progressive forming path of the rib plate, and use a special tool head to achieve a precision of 0.1 in the vertical direction The feed of mm constructs the mold surface of each forming path in real time, and then adjusts the air source to change the air pressure to ensure that the ribs fit the constructed mold surface every time, and uses a special temperature control box to control each time The bonded ribs are subjected to vibration-creep compound aging forming. Since the springback of the ribs is compensated and calculated in the optimized progressive forming path, the shape error caused by springback in each step is weakened, and because Low-frequency vibration is introduced in each step of forming, so that the ribs have a greater vibration displacement, the number of dislocations in the tissue gradually increases and tends to a stable position, and the creep aging causes the stress relaxation of the ribs, and the grains in the tissue The grains are refined, so as to achieve the double effect of improving the comprehensive performance and surface accuracy of the rib parts. The deformed surface formed by the multi-point mold is the final forming surface of the rib parts after unloading and springback.

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