Wrinkle-free edge covering structure and process for composite apron board of railway vehicle equipment compartment

Abstract

The invention discloses a wrinkle-free edge covering structure and process for a composite apron board of a railway vehicle equipment compartment. Compression molding is adopted, a mold closing gap is reserved outside the edges of mold cavities of an upper mold and a lower mold of a mold, the outermost layer of an upper skin is laid on the upper mold, a lower skin, a honeycomb sandwich and the other laying layers of the upper skin are laid on the lower mold, the lower skin is edge covering laying layers, the upper skin is divided into edge covering laying layers, full laying layers and reduced laying layers, it can be guaranteed that the edge covering laying layer on the outermost layer fully extends in the mold closing gap along with interlayer compaction in the thickness direction after mold closing, wrinkles caused in the process that the edge covering laying layer on the outermost layer is laid along the interior of a mold cavity and is subjected to mold closing compaction are eliminated, due to the fact that the multiple layers of edge covering laying layers are designed at the vertical edge position of an apron board, water inflow caused by prepreg layering is avoided, the shape repair cost is effectively reduced, the appearance quality is improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of hemming technology for a skirt plate of a vehicle equipment cabin, and in particular relates to a wrinkle-free hemming structure and a process for a skirt plate of a rail vehicle equipment cabin made of composite materials. Background technique [0002] The rail vehicle equipment cabin skirt is usually installed under the car body. Each car is assembled from multiple skirts. The skirt, bottom cover, and end partitions together play the role of protecting equipment and diverting ventilation. Traditional equipment compartment skirts are mostly made of aluminum alloy spot welding. With the rapid development of my country's rail transit high-speed EMUs, its equipment manufacturing technology is also constantly innovating, and higher requirements are put forward for vehicle lightweight. Composite material equipment is used The cabin skirt is a direct and effective way to reduce the weight of the car body struct...

AI Technical Summary

Problems solved by technology

Generally, the composite material equipment cabin skirt board has no edge-wrapping layer, and it needs to be assembled after surface repair, painting and other processes after molding, and the repair cost is high; the dimensional accuracy of the standing edges around the skirt board is too low or the appearance quality is not good. There will be problems such as the poor fit of adjacent skirts, the putty at the repaired place is easy to fall off during subsequent use, and the prepreg layers are prone to cracking and water ingress, which will affect the appearance quality and service life of the skirts.

[0003] Existing molding methods cannot meet the requirements of beautiful appearance, simple repair and excellent durability of composite material equipment cabin skirt board

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