Forming tool and method for I-shaped stringers with openings

Abstract

The invention relates to a forming tool and method for I-shaped stringers with openings. The structure of the forming tool is characterized in that a left forming die and a right forming die are arranged adjacently; opening strip grooves are symmetrically formed in the upper surface and communicated; the opening strip grooves are in discontinuous structures in axis directions of the left forming die and the right forming die; the discontinuous parts correspond to openings of the I-shaped stringers; grooves are formed in the lower parts of the discontinuous parts of the left forming die and the right forming die; transverse planes of T-shaped stop blocks are formed in the grooves; the vertical edges of the T-shaped stop blocks are formed in gaps between the left forming die and the right forming die; upper edge strip cover plates are arranged in the opening strip grooves. The method is capable of effectively guaranteeing the surface quality of the openings and avoiding the order difference in the horizontal edges of the stringers; moreover, the left forming die and the right forming die for the stringers are accurately positioned, the thickness sizes of vertical edges of the openings of the stringers can be guaranteed, the forming linearity of the stringers can be guaranteed and the defects of the length directions of the stringers caused by the forming tooling can be avoided.

Description

technical field [0001] The invention relates to a forming tool for a notched I-shaped long truss and a forming method thereof, belonging to a composite material technology. Background technique [0002] The I-shaped long stringer refers to the stringer with an I-shaped cross section. Generally, the length and width are quite different. It is composed of four parts: the left and right webs and the upper and lower edge strips. The two ends and the middle of the truss have an assembly relationship, which is used to avoid other parts. There is no web at the gap, only the lying edge blank. [0003] The forming mold of the I-shaped truss is mainly divided into left and right parts. Due to the existence of the gap, the length of the truss and the limitation of work and manufacturing, the forming mold of the truss needs to be designed and manufactured in sections. Placeholder molding modules of the same size. Due to the segmental design and manufacture of the tooling, it is diffi...

AI Technical Summary

Problems solved by technology

Due to the segmental design and manufacture of the tooling, it is difficult to ensure that the long stringer blanks are under the same pressure when the two parts are formed at the docking position, resulting in a thickness step difference in the lying edge blanks at the docking position, which affects the force transmission of the lying edge and the formation of the stringer surface quality

At the same time, there is no limit between the sections of the left and right stringer forming molds, and it is easy to move in the direction of the stringer axis. The side is too thin, which affects the structure and strength of the truss and cannot meet the design requirements

In addition, it is difficult to ensure that the axes of two or even multiple sections of the truss are on the same straight line when the truss forming mold is divided into sections, which will affect the straightness of the truss forming, and there are gaps between the sectional tooling, resulting in The long truss becomes longer. These factors seriously affect the structural strength and structural performance of the I-shaped long truss when there are multiple I-shaped long truss structures and long trusses, causing the parts to exceed the allowable tolerance range.

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