Special-shaped sealing ring for vacuum milling clamp for skin parts and use method of special-shaped sealing ring

Abstract

The invention discloses a special-shaped sealing ring for a vacuum milling clamp for skin parts, and relates to the technical field of vacuum milling clamps in aircraft manufacturing. The special-shaped sealing ring comprises a bottom surface structure, a boss structure and a side surface structure, the boss structure is a transition structure between the bottom surface structure and the side surface structure, and one end of the side surface structure is connected with the boss structure; and the other end of the side surface structure is suspended and is provided with a chamfer, the bottom surface structure, the boss structure and the inner surface of the side surface structure form a middle hollow structure, and the inner side of the side surface structure and the inner side of the bottom surface structure form an angle of 48 + / -2 degrees. The invention further relates to a use method of the special-shaped sealing ring. The condition that in the clamping and part machining processes of a sealing structure after vacumm absorption, when a part is tightly attached to the molded surface of a clamp, the air leakage phenomenon does not occur, and the hole forming precision can meet the use requirement are effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of vacuum milling fixtures in aircraft manufacturing, in particular to a special-shaped sealing ring used for vacuum milling fixtures of skin parts and a use method thereof. Background technique [0002] With the rapid development of the aviation industry, the design of the new generation of aircraft is also developing towards the goal of "light weight, long life, high reliability, high efficiency, high stealth, and low cost". Improvement, and the processing quality and precision of these parts have a very important impact on the assembly of the aircraft. At present, the CNC machining of aircraft skin parts is usually clamped by vacuum adsorption to realize the shape milling and hole making of the parts. [0003] For the rubber sealing rope in the vacuum milling fixture, in the prior art, a solid sponge rubber shaft with an "O" cross-section is often used to seal the entire vacuum chamber. However, the sol...

AI Technical Summary

Problems solved by technology

However, the solid sponge rubber shaft with "O" cross-section is inconvenient to install and operate, especially the seal near the drilling area is mostly made of a sponge rubber shaft that intercepts the circumferential length of the seal groove, and then the sponge rubber shaft is wound and installed in the seal groove sealed in a

Such a sealing structure is prone to air leakage at the interface of the rubber shaft during the clamping and processing of parts after vacuum adsorption, resulting in the failure of vacuum adsorption, resulting in the loose fit between the parts and the fixture surface

However, when the fit between the part and the fixture surface is not tight, it is easy to cause the hole-making accuracy to fail to meet the use requirements, and the part surface is also likely to be scrapped due to partial excess tolerance.

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