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

A progressive forming and age forming technology, which is applied in the field of curved surface forming of ribs and plates, can solve the problems of incomplete elimination of residual stress, long aging forming time, uneven distribution of internal stress, etc., and achieve complete release of residual stress, good dimensional stability, The effect of microscopic grain refinement

Pending Publication Date: 2019-07-19
CHONGQING THREE GORGES UNIV
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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 tempera

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

Examples

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Example Embodiment

[0041] Example 1

[0042] See figure 1 , figure 2 , Image 6 and Figure 7 , The material of the rib 4 is 7075-T6 aluminum alloy plate, which is prepared by milling into a sample with a specification of 300mm long, 150mm wide and a total height of 15mm thick (thickness of the thin plate 2mm, rib height 13mm); The radius of curvature of the final forming surface in the length direction of the rib is 2200mm, and the optimized progressive forming path has 4 steps; first place the sample in the vacuum bag 3 and place it at the center of the multi-point mold 6 directly above The trachea 8 is inserted into the vacuum bag 3 and sealed, the sealed sample together with the vacuum bag 3 is fixed and locked with the bead 5 through the bolt assembly, and the bead 5 is pressed by the ejector rod 20 to avoid the two sides of the locked sample Warping occurs in the middle, while adjusting the M×N tool heads 18 to construct the first mold profile, then adjust the position of the suction port of...

Example Embodiment

[0043] Example 2

[0044] See figure 1 , figure 2 , Figure 5 and Image 6 , The sheet material of the ribs 4 is a 3mm thick 7075-T6 aluminum alloy sheet, and the ribs of the rib 4 are a 5mm thick, 16mm high 8090-T8 aluminum-lithium alloy sheet, which is welded by friction stir welding. It is a sample with a length of 240mm, a width of 120mm, and a total height of 19mm with a rib; the radius of curvature of the final forming surface of the sample along the length of the rib is 1200mm, and the optimized progressive forming path has 6 steps; adopting Example 1 The sample is clamped and fixed; turn on the vacuum pump switch, adjust the air source pressure, draw out the vacuum inside the vacuum bag 3, make the sample fit the first mold surface constructed by the tool head 18, when M ×When the alarms of N tool heads 18 are all sounding, turn off the vacuum pump switch. At this time, the pressure required for the rib plate 4 to fit is 4.5 Bar; at the same time, turn on the temperature...

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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...

Claims

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Application Information

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IPC IPC(8): B21D31/00C22F1/04
CPCB21D31/005C22F1/04
Inventor 左都全曾毅杨丹丹罗锦洁王海宝徐海华
Owner CHONGQING THREE GORGES UNIV
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