CN-115782242-B - Quick cooling and quick heating mould pressing die and method for thermoplastic prepreg product

CN115782242BCN 115782242 BCN115782242 BCN 115782242BCN-115782242-B

Abstract

The invention discloses a rapid cooling and rapid heating mould pressing mould and a rapid cooling and rapid heating mould pressing method for a thermoplastic prepreg product, wherein the rapid cooling and rapid heating mould pressing mould comprises a template, a mould core and a first cushion block; the die plate comprises an upper die plate and a lower die plate, wherein the die core comprises an upper die core and a lower die core, a plurality of first cushion blocks are arranged between the upper die core and the lower die core, an upper cooling plate and a first electromagnetic heating plate for heating the upper die core are sequentially arranged between the upper die plate and the upper die core, and a lower cooling plate and a second electromagnetic heating plate for heating the lower die core are sequentially arranged between the lower die plate and the lower die core. The invention can realize rapid heating and rapid cooling, can produce prepreg products with various thicknesses by the same pair of dies, has higher universality and flexibility, can flexibly adjust deformation quantity, effectively reduces the problem that the dies are heated and thermally deformed, ensures the uniformity of the thickness of the products to a greater extent, and has high usability.

Inventors

LU PINGCAI
XUE SHENG
ZHU YE
YUE XIAODONG
JING YUNMIN

Assignees

江苏兆鋆新材料股份有限公司

Dates

Publication Date: 20260505
Application Date: 20221203

Claims (7)

1. A rapid cooling and rapid heating mould for a thermoplastic prepreg product is characterized by comprising a template, a mould core and a first cushion block (3); The die plate comprises an upper die plate (11) and a lower die plate (21), wherein the die core comprises an upper die core (14) and a lower die core (24), a plurality of first cushion blocks (3) are arranged between the upper die core (14) and the lower die core (24), and the first cushion blocks (3) arranged between the upper die core (14) and the lower die core (24) are all replaceable or adjustable first cushion blocks (3); An upper cooling plate (12) and a first electromagnetic heating plate (13) for heating the upper die core (14) are sequentially arranged between the upper die plate (11) and the upper die core (14); A lower cooling plate (22) and a second electromagnetic heating plate (23) for heating the lower die core (24) are sequentially arranged between the lower die plate (21) and the lower die core (24); the upper cooling plate (12) is connected with the upper template (11) through a plurality of second cushion blocks (4), and the lower cooling plate (22) is connected with the lower template (21) through a plurality of second cushion blocks (4); a third high-pressure water cooling pipeline (17) is further arranged on the upper cooling plate (12), and the third high-pressure water cooling pipeline (17) is a one-way straight pipeline penetrating through the upper cooling plate (12); A fourth high-pressure water cooling pipeline (27) is further arranged on the lower cooling plate (22), and the fourth high-pressure water cooling pipeline (27) is a one-way straight-through pipeline penetrating through the lower cooling plate (22); The upper die core (14) is also provided with a first high-pressure water-cooling pipeline (16), the first high-pressure water-cooling pipeline (16) is a one-way straight-through pipeline penetrating through the die, the lower die core (24) is also provided with a second high-pressure water-cooling pipeline (26), and the second high-pressure water-cooling pipeline (26) is a one-way straight-through pipeline penetrating through the die; the upper template (11) and the upper cooling plate (12) are mutually insulated, and the lower template (21) and the lower cooling plate (22) are mutually insulated; the device also comprises a thermal deformation correction structure; the thermal deformation correction structure includes: A plurality of first fastening screws (19) positioned at the middle part of the die, wherein the first fastening screws (19) sequentially penetrate through the upper die plate (11), the upper cooling plate (12) and the first electromagnetic heating plate (13) and are fastened and connected with a threaded inner hole arranged on the upper die core (14), and The second fastening screws (29) are positioned at the middle part of the die, and the second fastening screws (29) sequentially penetrate through the lower die plate (21), the lower cooling plate (22) and the second electromagnetic heating plate (23) and are fixedly connected with a threaded inner hole formed in the lower die core (24); the first fastening screw (19) enables the upper die core (14) to deform through locking tension; the second fastening screw (29) enables the lower die core (24) to deform through locking tension.
2. The rapid cooling and rapid heating mold for thermoplastic prepreg product according to claim 1, wherein: A first electromagnetic coil is arranged in the first electromagnetic heating plate (13), and the first electromagnetic coil is connected with a high-frequency current generator; The second electromagnetic heating plate (23) is internally provided with a second electromagnetic coil, and the second electromagnetic coil is connected with a high-frequency current generator.
3. The rapid cooling and rapid heating mold for thermoplastic prepreg product according to claim 1, wherein: The middle part of the upper die core (14) is provided with a first thermocouple (15), the first thermocouple (15) is in signal connection with a first electromagnetic heating plate (13), the middle part of the lower die core (24) is provided with a second thermocouple (25), the second thermocouple (25) is in signal connection with a second electromagnetic heating plate (23), and/or The die core is a female and male die comprising an upper die core (14) and a lower die core (24), wherein the lower die core (24) positioned below is a female die, and the upper die core (14) positioned above is a male die.
4. The rapid cooling and rapid heating mold for thermoplastic prepreg product according to claim 1, wherein: The first cushion blocks (3) are uniformly distributed on the involuted periphery of the upper die core (14) and the lower die core (24), and/or The thickness of the first cushion block (3) is 0.5-10 mm.
5. The rapid cooling and rapid heating mold for thermoplastic prepreg product according to claim 1 or 2, wherein: The template and the die core are made of air-cooled hardening type hot work die steel, the template and the die core are made of the template and the die core with the surface hardness of 50-70 HRC, and/or The first electromagnetic coils are uniformly distributed on the first electromagnetic heating plate (13), the second electromagnetic coils are uniformly distributed on the second electromagnetic heating plate (23), and/or The width of the second cushion blocks (4) is 1-10 cm, and/or The distance between the adjacent second cushion blocks (4) is 1-10 cm, and/or And each second cushion block (4) is fixed on the corresponding upper cooling plate or lower cooling plate by adopting M10 countersunk bolts.
6. The rapid cooling and rapid heating mold for thermoplastic prepreg product according to claim 1, wherein: The thickness of the upper template (11) and the lower template (21) is more than or equal to 7cm.
7. A rapid cooling and rapid heating molding method for a thermoplastic prepreg product, characterized in that it uses the rapid cooling and rapid heating molding die as described in any one of claims 1 to 6, comprising the steps of: The method comprises the steps of 1) cutting and stacking thermoplastic prepreg, putting the cut and stacked thermoplastic prepreg into a rapid mould, and controlling the thickness of a finished prepreg product by adjusting the thickness of a first cushion block, wherein when the rapid mould is closed, only contact pressure is applied instead of full pressure, and electromagnetic heating is started to perform rapid heating and heating, wherein the heating rate of starting the electromagnetic heating to perform rapid heating and heating is 10-50 ℃ per min; When the rapid mould pressing mould reaches a preset temperature threshold, carrying out heat preservation for a preset time period so as to lead the temperature of the mould to be conducted into the prepreg, thereby leading the resin in the mould to be melted; step 3), closing the rapid compression molding die, applying full pressure and vacuumizing, so that the prepreg is molded in the heating extrusion process; After the product is molded, injecting cooling water into the unidirectional straight-through high-pressure water cooling pipelines of the upper water cooling plate and the lower water cooling plate for rapid cooling and shaping; Step 5), opening the mould to take out the product; The method also comprises the following steps: The method comprises the steps of adjusting the torsion of a plurality of first fastening screws to correct the thermal deformation of an upper die core and realizing the deformation of a lower die core; In the step 4), after the product is molded, cooling water is injected into the unidirectional straight-through high-pressure water-cooling pipelines of the upper water-cooling plate and the lower water-cooling plate, and simultaneously, cooling water is injected into the unidirectional straight-through high-pressure water-cooling pipelines of the upper die core and the lower die core for rapid cooling and shaping, wherein the cooling rate for the rapid cooling and shaping is 20-80 ℃ per minute.

Description

Quick cooling and quick heating mould pressing die and method for thermoplastic prepreg product Technical Field The invention belongs to the technical field of thermoplastic composite material prepreg product molding, and particularly relates to a compression molding die and a compression molding method for preparing a thermoplastic prepreg product. Background The carbon fiber reinforced resin matrix composite material has the characteristics of excellent specific strength, specific modulus, corrosion resistance, energy absorption and the like, and plays an increasingly important role in the fields of automobiles, rail transit, airplanes and the like. Thermoplastic composites are increasingly known for their particular advantages of high impact resistance, recyclability, resistance to corrosion by various organic solvents, low specific gravity, etc. However, the thermoplastic resin has higher viscosity and great molding difficulty, and the search for a simple and easy low-cost manufacturing process is always the research focus in the field of modern novel composite materials, while the continuous fiber thermoplastic composite material product molding process is a difficult point. Compared with thermoplastic composite materials, the molding process of epoxy prepreg products has been developed for many years, and various stabilized large-scale molding technologies such as a pipe coiling process, a compression molding process, an autoclave process, a winding molding process and the like have been formed. While the thermoplastic prepreg product forming process is relatively immature, the forming process is relatively less, and the main forming process at present comprises two types of laser winding and mould pressing. The biggest impediment to the manufacture of thermoplastic prepregs into articles is the processing and shaping temperatures, which are often used for thermoplastic prepregs at temperatures above 350 ℃, far above thermosets. In recent years, the development of the carbon fiber field is rapid, but the development rule of the carbon fiber industry is ignored, the low-level repeated construction leads to a pattern with lower industrial concentration, the low-level repeated construction is particularly characterized by low level and serious homogenization phenomenon, the single production line of enterprises has small scale, most enterprises only have hundred-ton production capacity, and the technical equipment, downstream product development and application and other aspects have obvious gaps from advanced level. Therefore, the development of high-performance prepreg composite molding equipment breaks through the upgrading and updating of products, and is an urgent need to be solved in the development of the prepreg industry towards the high-end and industrial safety of products. Disclosure of Invention The invention aims to overcome the defects in the prior art, provides a rapid cooling and rapid heating die for preparing a thermoplastic prepreg product, and simultaneously provides a rapid cooling and rapid heating die pressing method for preparing the thermoplastic prepreg product. The invention provides a rapid cooling and rapid heating mould for a thermoplastic prepreg product, which comprises a template, a mould core and a first cushion block; The die comprises a die plate, a die core, a plurality of first cushion blocks, a plurality of second cushion blocks and a plurality of second cushion blocks, wherein the die plate comprises an upper die plate and a lower die plate; an upper cooling plate and a first electromagnetic heating plate for heating the upper die core are sequentially arranged between the upper die plate and the upper die core; and a lower cooling plate and a second electromagnetic heating plate for heating the lower die core are sequentially arranged between the lower die plate and the lower die core. Preferably, a first electromagnetic coil is arranged in the first electromagnetic heating plate and connected with the high-frequency current generator, and a second electromagnetic coil is arranged in the second electromagnetic heating plate and connected with the high-frequency current generator. Preferably, the upper cooling plate and the lower cooling plate are both water cooling plates. Preferably, the upper cooling plate is further provided with a third high-pressure water cooling pipeline, the third high-pressure water cooling pipeline is a unidirectional straight-through pipeline penetrating the upper cooling plate, the lower cooling plate is further provided with a fourth high-pressure water cooling pipeline, and the fourth high-pressure water cooling pipeline is a unidirectional straight-through pipeline penetrating the lower cooling plate. Preferably, a first thermocouple is arranged in the middle of the upper die core and is in signal connection with the first electromagnetic heating plate, and a second thermocouple is arranged in the middle of the lower die core and is