Method for impregnating glass fiber unidirectional tapes used for laying of main blade longeron

Abstract

The invention belongs to the composite manufacturing technology, and relates to a method for impregnating glass fiber unidirectional tapes used for laying of a main blade longeron. Impregnation steps are as follows: impregnation liquid is prepared; a comparison table of weights of glass fiber unidirectional tapes dried in per unit lengths of each batch of glass fiber raw materials and weights of glass fiber unidirectional tapes after impregnation is established; impregnation is conducted; impregnation detection is passed; sampling is carried out; whether impregnation is qualified or not is judged. The method for impregnating the glass fiber unidirectional tapes used for laying of the main blade longeron has the advantages that weight and volume fluctuation, caused by linear density fluctuation of glass fibers, of preimpregnated glass fiber unidirectional tape lines is greatly reduced, the phenomenon of static balance out-of-tolerance of blades is avoided, and the compression moulding forming qualification rate of the blades is increased.

Description

technical field [0001] The invention belongs to the composite material manufacturing technology, and relates to a method for impregnating a glass fiber unidirectional tape used for paving a main blade girder. Background technique [0002] The main blade is the most critical part of the helicopter, and the prepreg tape girder of the composite material blade is the most critical part of the main blade. For mold closing, only a prepreg tape girder with an appropriate volume can be placed to produce a qualified one. main blade. At present, the main beam of the helicopter is a pre-impregnated glass fiber unidirectional belt, and the method adopted is to strictly control the glue content to ±2%. The proportion by weight of epoxy resin and domestic DDM curing agent. The disadvantage is: because the linear density of glass fiber generally fluctuates, this will cause the maximum fluctuation of the linear density of the prepreg glass fiber unidirectional tape to reach ±9%, and the v...

AI Technical Summary

Problems solved by technology

The disadvantages are: because the linear density of glass fiber generally fluctuates, this will cause the maximum fluctuation of the linear density of the prepreg glass fiber unidirectional tape to reach ±9%, and the volume fluctuation reaches ±6%, which is such a large weight for the blade. and volume fluctuations will affect the molded pass rate of the blade, resulting in frequent occurrence of the static balance of the blade.

In addition, for the manufacture of composite material blades, the relative size relationship between materials is very important. If the size of a certain part changes too much, it will affect the thickness of other parts, and then affect its corresponding rubber content index and Mechanical properties, in severe cases, large-scale delamination, glue opening, etc. may occur, making the manufactured blades unusable

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