A carbon fiber molding process

Abstract

The invention discloses a carbon fiber forming process. The carbon fiber forming process comprises the following steps of 1, putting formula materials into a second feeding through hole according to the formula proportion; 2, shearing and heating the formula materials, so that the materials reach the molten state; 3, putting continuous fibers into first feeding through holes formed in the downstream of the second feeding through hole; 4, shearing the continuous fibers to obtain fiber fragments, meanwhile mixing the fiber fragments with the formula materials in the molten state, so that injection molding melt is formed, if an injection structure is switched off, implementing step 5, and if the injection structure is started, implementing step 6; 5, conveying the injection molding melt into an injection transfer structure, and if the injection structure is started, stopping the step 5 and implementing a step 6 in turn; 6, conveying the injection molding melt into the injection structure; and 7, after the capacity of the injection molding melt reaches the set value, conducting injection. By means of the carbon fiber forming process, time of high temperature damage of carbon fibers can be shortened, and the length of the carbon fibers in a finished product can be increased.

Description

technical field [0001] The invention relates to the field of injection molding machines, in particular to a carbon fiber molding process. Background technique [0002] Carbon fiber is a new type of inorganic fiber material with a carbon content above 90% (mass fraction), with high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, radiation resistance, electrical conductivity, heat transfer, and relative density A series of excellent properties, such as small, are typical high-performance fibers. Carbon fiber not only has the inherent characteristics of carbon materials, but also has the softness and processability of textile fibers. The components made of carbon fibers are light in weight, high in specific stiffness, and have a wide range of applications. However, there are currently four mature application forms of carbon fiber. One is the hand lay-up method, in which the carbon fiber sheets impregnated with gl...

AI Technical Summary

Problems solved by technology

However, there are currently four mature application forms of carbon fiber. One is the hand lay-up method, in which the carbon fiber sheets impregnated with glue are cut into layers, or resin is applied while layering, and then hot-pressed. , the strength of the carbon fiber product made by this method is high, but the production efficiency is low; one is the winding molding method, which winds the carbon fiber monofilament on the carbon fiber shaft, this method is only suitable for making cylinders and hollow vessels, and the production efficiency Low; one is the molding method, which is to put the pre-impregnated carbon fiber material into the metal mold, pressurize the excess glue to overflow, and then cure it at high temperature. The carbon fiber products made by this method The strength is high, but the production efficiency is also low, and structural parts cannot be made; one is the long-fiber pellet injection molding method, which pre-processes carbon fibers to make pellets, and then injection molding through an injection molding machine. Although this method solves the problem of production efficiency However, for the carbon fiber with long fiber length in the pellets, under the shearing and heating action of the screw of the injection molding machine and the hot runner, only 30% of the finished product has a fiber length of more than 5mm, resulting in a large strength of the finished product. reduce

[0003] Since the strength of carbon fiber material itself is easily damaged at high temperature, and the length of carbon fiber and its interlacing complexity in the finished product will affect the strength of its finished product, it can be seen that the current application of carbon fiber will soon be guaranteed The strength of carbon fiber material and the production process of mass industrial production are vacant. Therefore, it is necessary to develop a method that can reduce the time for carbon fiber to be damaged by high temperature and increase the length of carbon fiber in the finished product, and can meet industrial mass production. The efficiency requirements of the process is especially necessary

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