Production method for assembling hole of composite material part

Abstract

The invention belongs to an assembling technology of a composite material and relates to a production method for an assembling hole of a composite material part. The production method for the assembling hole of the composite material part is characterized in that after the composite material part is pressurized and cured at high temperature, and when a mold to be formed and the composite material part restore to normal temperature, a drilling jig is positioned and pressured. The drilling jig is divided into a bottom and a drilling part which are integrated; the bottom and a molded surface of a forming mold are attached and fixed; a drilling area is positioned above the part; and a drilling bushing sleeves the drilling area for drilling. The assembling hole of the composite material part, produced by the production method disclosed by the invention, is free of influence from curvature and overall dimension of products, is accurate in position and can be coordinated with a positioning hole in an assembling workshop; and the demand of actual assembly is met, and the assembling precision of an airplane is effectively improved.

Description

technical field [0001] The invention belongs to composite material assembly technology, and relates to a hole-making method for assembly holes of composite material parts. Background technique [0002] When composite parts are assembled in the assembly workshop, the assembly holes outside the cutting line are usually used to position and compress the parts, and the assembly holes are made by the molding workshop. [0003] The existing hole-making method in the molding workshop is usually to use polytetrafluoroethylene positioning pins to insert into the positioning holes of the forming mold before laying the layers, and then pull them out to form assembly holes after curing under high temperature and pressure. However, since most forming molds are made of metal, and the thermal expansion coefficient of metal molds is larger than that of composite materials, the formed parts are larger than the theoretical shape, so stress will be generated at the position of the positioning ...

AI Technical Summary

Problems solved by technology

However, since most forming molds are made of metal, and the thermal expansion coefficient of metal molds is larger than that of composite materials, the formed parts are larger than the theoretical shape, so stress will be generated at the position of the positioning pin

In this case, the positioning pin is pulled out, and the stress of the part is released, causing the formed assembly hole to deviate from the theoretical position. This phenomenon is especially serious for parts with large external dimensions and curvature.

As a result, the assembly holes of the parts are inconsistent with the positioning holes of the tooling in the assembly workshop, which brings difficulties to the assembly of composite parts, and sometimes even has to give up the positioning of the assembly holes, which seriously affects the assembly accuracy of the aircraft.

Images