Device and method for directly preparing short fiber preform by integrating stirring and filtering

Abstract

The invention discloses a device and method for directly preparing short fiber preform by integrating stirring and filtering, and belongs to the technical field of short fiber preforms. The device comprises a stirring and dispersing module, a negative-pressure suction filtration instantaneous forming module, a special-shaped part mold forming module and a circulating backflow module. The negative-pressure suction filtration instantaneous forming module is located at the bottom, and a lower water storage cavity is vacuumized through a vacuum pump control valve to provide negative pressure; the stirring and dispersing module is located above the negative-pressure suction filtration instantaneous forming module, and a stirring motor controls a stirring head to stir a mixed solution in a stirring barrel; the special-shaped part mold forming module is placed in the stirring barrel and on a filter screen, and a bottom opening is communicated with the filter screen; and a circulating pump of the circulating backflow module injects water in the water storage cavity into the stirring barrel through a backflow pipe, and circulating water flow is provided. According to the forming device, rapid and continuous preparation of the short carbon fiber special-shaped part preform is achieved, the dispersion uniformity of fibers in the special-shaped part preform is guaranteed, the defects of surface pits and internal air holes are eliminated, and the volume fraction can reach 20%.

Description

technical field [0001] The invention belongs to the technical field of short fiber preforms, and in particular relates to a device and a method for directly preparing short fiber preforms with an integrated stirring and filtering process. Background technique [0002] Chopped carbon fiber is made by chopping carbon fiber filaments. Generally, the length of chopped fiber is less than 10mm. It has the characteristics of high strength, high modulus, hardness, dimensional stability and isotropic performance. Its composite materials have important applications in aerospace, national defense weaponry and other fields, and can also take advantage of its low cost advantage (less than 1 / 5 of continuous fiber) to promote in automotive, electronics and civilian fields. When using the pressure infiltration method to prepare chopped carbon fiber reinforced composite materials, the preform surface pits, internal pores, skeleton strength, fiber distribution uniformity and preparation proce...

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Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a device and method for directly preparing short fiber preforms by stirring and filtering, which overcomes the traditional step-by-step operation for the formation of existing short fiber preforms, which requires the fiber slurry The material is transferred from the stirring device to the forming device, the preparation cycle is long, the efficiency is low, and it is difficult to ensure the uniformity of fiber distribution during the transfer process

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