Unrestraint assembly method of plug-in type bundled bracket

Abstract

The invention provides a unrestraint assembly method of a plug-in type bundled bracket. The steps of preassembly-splitting-reset-splitting-reset are performed for a composite sandwich layer consisting of a bundled bracket, a middle frame and inner and outer reinforced plates; in the process, a technological cover is used for replacing a cover; on the basis of determining a positioning hole, a drill plate is guided to finish precise reaming positioning of a connecting hole near the side of the cover; the precisely reamed connecting hole near the side of the cover serves as positioning standard to determine the positions of remainder connecting holes; and finally, the unrestraint plug-in assembly of the bundle bracket is finished. The method prevents the limitation of the operation space caused by the cover, brings convenience for the drilling of the connecting hole near the side of the cover, realizes unrestraint drilling of the connecting holes in the bundled bracket, uses the precisely reamed connecting hole near the side of the cover as standard to prevent the positioning error caused by the use of a transition fit positioning shaft pin, and guarantees precise reset of the composite sandwich layer after the splitting; and the unrestraint assembly method is provided to the plug-in type bundled bracket.

Description

technical field [0001] The invention belongs to the field of aerospace, and in particular relates to an unconstrained assembly method of a plug-in binding support. Background technique [0002] In the current domestic aerospace products, as an important connecting piece connecting the core-level rocket body and the booster, the binding support has been widely used in the shells such as the first-stage box section of the launch vehicle. The existing binding support connection method generally adopts radial bolt connection: the binding support is assembled on the outside of the launch vehicle shell, and the radial bolt holes of the shell are usually made by using a radial drilling machine under the support, and then the binding support and The housing is radially screwed. [0003] With the continuous improvement of carrying capacity requirements, the new generation of large launch vehicles newly developed in my country has the characteristics of high performance and large car...

AI Technical Summary

Problems solved by technology

At the same time, in order to ensure the reliability of the connection of the binding support, the binding support is often made of high-strength steel such as 30CrMnSiNi2A, which has high hardness and is extremely difficult to make holes.

[0004] During the assembly process of the plug-in binding support, the first product of the XX-5 first-level rear transition section shell, because the axial connection hole of the binding support is too close to the skin, there is limited operating space, and manual operation can only be used. processing, while the manual drilling and reaming of the installation hole diameter is more out of tolerance, the quality consistency is not high, the hole accuracy required for the installation hole of the bundled support is Φ12 0 +0.043 , the out-of-tolerance rate of the aperture quality of the installation hole using manual drilling and reaming is up to 30%; at the same time, when the manual drilling and reaming is used to ream the bolt hole 15mm close to the skin, the reamer can only rotate 30° at a time, the schematic diagram of manual reaming like figure 1 and figure 2 shown

The limitation of the operating space leads to low drilling and stranding efficiency. According to statistics, it takes about 5.9 hours to complete the 8 bolt holes on the plug on the bundled support

In addition, the drilling and reaming of the bolt holes of the plug under the bundled support can only be performed by lying on the platform platform and drilling upwards. The drilling and reaming efficiency is lower than that of the upper plug. It takes about 9 hours to drill 8 bolt holes

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