Heating method of continuous fiber reinforced thermoplastic composite material

Abstract

The invention relates to a continuous fiber reinforced thermoplastic composite material heating method, which comprises: S1, detecting the melting point temperature of a sample to be detected to obtain a first temperature value T1; s2, arranging a to-be-detected sample into heating equipment; s3, constructing a heating vector, wherein the heating vector comprises a second temperature value T2 and a preset heating duration t; the second temperature value T2 is equal to the adjustment coefficient * the first temperature value T1; 0.6 < = adjusting coefficient < = 1.2; s4, a heating temperature function of the heating equipment is preset, the heating temperature function comprises a sequence of a plurality of heating vectors, and adjusting coefficients of second temperature numerical values T2 in all the heating vectors are gradually increased; and S5, driving heating equipment to heat the to-be-tested sample according to the heating temperature function. Through partition heating of the infrared heating furnace, infrared radiation of electric infrared heating can penetrate into the surface of a heated material by a certain depth, and the infrared heating furnace has the advantages of being high in heat efficiency, high in heating speed, low in electric energy consumption, high in heating quality, good in operation environment and the like.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a heating method for continuous fiber reinforced thermoplastic composite materials. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for lightweight vehicles are increasing. On the premise of ensuring the strength and safety performance of the car, the overall quality of the car should be reduced as much as possible, so as to improve the power of the car and reduce energy consumption. Fiber-reinforced composite materials play an important role in the lightweight process of automobiles due to their excellent specific strength, specific stiffness, corrosion resistance and fatigue resistance. [0003] Because of its plasticity at a certain temperature, thermoplastic composite materials can be made into products of a certain shape in a molten state. They have good formability, high specific strength, and high pro...

AI Technical Summary

Problems solved by technology

Or the heating of the material is achieved by means of an infrared heating furnace, but the heating temperature and time selected are high temperature for a short time or low temperature for a long time, which causes the material to generate large internal stress due to heating, which is not conducive to product molding

[0006] Heating inside the mold of thermoplastic materials requires a higher temperature on the surface of the mold. At the same time, the temperature is transmitted from the surface of the mold to the material, which requires a long time for heat conduction, so that there is a certain temperature difference between the upper and lower surfaces of the material, and the upper and lower surfaces of the material are prone to uneven heating. , affects the material forming, and for materials with a certain thickness, it is difficult to achieve material heating in the mold

At the same time, heating the material in the mold requires manual layering, which wastes labor costs, is not conducive to safe production, is not conducive to the implementation of automated production, and has a long production cycle.

[0007] Use an oven to heat thermoplastic materials. The heating method of the oven is to heat the material in the box through hot air, and the heat conduction of the hot air is uncontrollable, which is not conducive to achieving uniform heating of the material. At the same time, it takes a long time to heat the oven. In order to make the material reach the temperature required for molding, the material will be in a high temperature state for a long time, and will release more VOC, which is not conducive to the environmental protection requirements in material production

[0008] Moreover, the infrared heating furnace is used to heat the material through high temperature for a short time or low temperature for a long time. The instantaneous high temperature will destroy the resin on the surface of the material, making the resin content of the final molded sample product uneven, affecting the quality of the product. mechanical properties

The method of heating at low temperature for a long time, the heating time is too long, which increases the production time and prolongs the production cycle

Moreover, the existing infrared heating furnace has no partitions in the heating, and there is no targeted temperature control system to adjust the temperature requirements of different areas of the material, and it is impossible to accurately control the temperature of the material

Images