Forming mold for aircraft skin part

Abstract

The invention relates to a forming die of a skin part for an airplane. The forming die comprises a compression block, a male die, a female die, a binder ring and a pressing plate, wherein the male die comprises a straight wall part and a forming part; the female die is provided with a cavity for holding billets and liquid; the binder ring comprises an upper binder ring and a lower binder ring; the lower binder ring can be slidably located on the female die in the longitudinal direction, and is provided with a second penetrating hollow part adapt to a lower straight wall part; the upper binder ring can be detachably fixed on the lower binder ring, and is provided with a first up-and-down penetrating hollow part; the upper binder ring is detachably connected with a second pressurizing source, so that the compression block and the male die sequentially penetrate through the first hollow part and the second hollow part under the action of a first pressurizing source, and when the forming part of the male die is used for forming the billets in the cavity of the female die, the second pressurizing source presses the upper binder ring and the lower binder ring on the female die. According to the forming die of the skin part for the airplane, the resilience after a part is formed is effectively reduced, and the forming accuracy and the surface quality are improved.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing, and in particular relates to a forming die for an aircraft skin part. Background technique [0002] The skin is an important key part that constitutes the aerodynamic shape of the aircraft. Since the skin is directly in contact with the airflow and directly participates in force and force transmission during flight, the manufacture of skin parts not only has the requirements of accurate shape and mechanical performance indicators, but also has surface quality. strict requirements. Skin parts are mainly based on the shape, size, material, thickness and other factors of the part. The main forming process methods include drop forming, gate pressing forming, roll forming, drawing forming and traditional deep drawing forming. [0003] The thin skin is formed by the traditional falling pressure process, which is formed by conventional convex and concave upper and lower dies. The form...

AI Technical Summary

Problems solved by technology

The surface quality of the parts processed by this process method is difficult to meet the design requirements, and there are the following disadvantages in the manufacturing of the parts: the pressed parts are easy to spring back, it is very difficult to correct the shape after falling pressure, the shrinkage of the parts is poor, and the formed wrinkles cannot be eliminated; the surface of the parts after falling pressure The quality and shape accuracy are poor; the uneven force of the falling pressure parts can easily make the sheet unstable, resulting in agitation and warping deformation

[0006] 1. If the skin is formed by the traditional falling pressure process, the parts are easy to spring back, and it is very difficult to correct the shape after the falling pressure. Destabilize the sheet, resulting in drumming and warping

[0007] 2. If the rubber bag skin forming process is used, although only half mold forming is required, the parts are easy to spring back after the rubber bag is formed, and the amount of spring back is not easy to control, which has a great impact on the forming accuracy of the parts

[0008] 3. If the longitudinal stretch forming process is adopted, it is more suitable for forming large-scale skin parts. However, a large amount of stretch deformation often causes slip lines or coarse grains to appear on the skin surface, causing the skin to be scrapped and affecting the skin. Excellent surface quality and shape accuracy

[0009] 4. If the traditional deep drawing process is adopted, it will bring problems such as complex process and many working steps for deep cavity skin parts

However, for complex thin-walled surface skin parts, it is easy to cause wrinkling in the overhang, which is not easy to control

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