CN217862904U

CN217862904U - Mould for reducing RTM (resin transfer molding) manufacturing cost of composite material structure

Info

Publication number: CN217862904U
Application number: CN202123301496.0U
Authority: CN
Inventors: 卓鹏; 刘强
Original assignee: AVIC Beijing Aeronautical Manufacturing Technology Research Institute
Current assignee: AVIC Beijing Aeronautical Manufacturing Technology Research Institute
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-11-22
Anticipated expiration: 2031-12-24

Abstract

The utility model relates to a reduce mould of combined material structure RTM shaping manufacturing cost, this mould comprises RTM shaping cavity by last moulded die (3) and lower moulded die (4) compound die, be provided with into jiao kou (5) and through tube coupling injection apparatus (7) in one side of moulded die (4) down, be provided with out jiao kou (6) and through tube coupling resin recovery unit (8) in the opposite side of lower moulded die (4) of advancing jiao kou (5) subtend, still be provided with thermocouple (9) in the side of lower moulded die (4) and be used for measuring the temperature in the RTM shaping cavity, be provided with upper heater (1) above upper moulded die (3) and be used for heating upper moulded die (3), be provided with lower heater (2) below lower moulded die (4) and be used for heating lower moulded die (4); the utility model discloses technical scheme implements simply, and the electric heating mode of use heats the mould, does not need main equipment such as oven, has reduced the manufacturing cost of combined material finished piece, has good RTM technology universality.

Description

Mould for reducing RTM (resin transfer molding) manufacturing cost of composite material structure

Technical Field

The utility model relates to a reduce combined material structure RTM shaping manufacturing cost's mould belongs to the liquid shaping technical field of resin matrix combined material.

Background

The carbon fiber reinforced resin matrix composite material has the unique advantages of light weight, high specific strength, high specific modulus, good fatigue fracture resistance, corrosion resistance, convenience for large-area integral forming and the like, is widely applied to aviation aircrafts and engine structures, becomes a key material of aviation equipment, and the using amount of the carbon fiber reinforced resin matrix composite material also becomes one of the advanced marks of the aviation equipment.

Resin Transfer Molding (RTM) is a liquid Molding composite material manufacturing technique that has been widely used in the fields of aviation and aerospace in recent years. The principle is that a dry fiber preform designed according to performance and structure requirements is laid in a rigid mold cavity, resin is heated to a set injection temperature in a specific pressure-resistant container, namely a resin storage tank, then low-viscosity resin is injected into the mold cavity by adopting injection equipment to fully infiltrate the resin and the fiber, and finally, the temperature is raised and cured according to the technological specification of the resin, and finally, a composite material part with the shape consistent with that of the mold cavity is obtained.

The conventional RTM molding technique requires that a metal mold be placed in a large-sized heating device such as an oven to heat the mold, thereby raising the temperature of the resin in the cavity to a curing temperature. Therefore, the investment cost of the equipment is high, the temperature rising efficiency is low, and the energy consumption is high. Meanwhile, the traditional RTM metal mold mainly uses steel as a main material. In order to ensure the product precision, invar steel with a low expansion coefficient is also used, and the Invar steel is high in raw material price, difficult to machine and high in manufacturing cost. Therefore, there is a need for an apparatus and method that reduces the manufacturing cost of RTM molding techniques.

Disclosure of Invention

The utility model discloses just to exist among the above-mentioned prior art not enough and design and provide a mould that reduces combined material structure RTM shaping manufacturing cost, the purpose is through using the electric heating mode to heat the mould and do not need main equipment such as oven, has reduced the manufacturing cost of combined material finished piece, has good RTM technology universality.

To the problem that traditional RTM forming process manufacturing cost is high, the utility model provides a following technical scheme:

the mould for reducing the RTM forming manufacturing cost of the composite material structure comprises an RTM forming cavity formed by combining an upper forming mould 3 and a lower forming mould 4, wherein the upper forming mould 3 is a convex mould, and the lower surface of the upper forming mould is processed by taking the upper surface of a workpiece as a reference; the lower forming die 4 is a concave die, and the upper surface of the lower forming die is processed by taking the lower surface of a workpiece as a reference; a glue inlet 5 is arranged on one side of a lower forming die 4 and is connected with an injection device 7 through a pipeline, a glue outlet 6 is arranged on the other side of the lower forming die 4 opposite to the glue inlet 5 and is connected with a resin recovery device 8 through a pipeline, a thermocouple 9 is also arranged on the side surface of the lower forming die 4 and is used for measuring the temperature in an RTM forming cavity, an upper heater 1 is arranged on the upper forming die 3 and is used for heating the upper forming die 3, and a lower heater 2 is arranged below the lower forming die 4 and is used for heating the lower forming die 4;

the upper forming die 3 and the lower forming die 4 are made of short carbon fiber reinforced polymer composite materials with low thermal expansion coefficients.

In practice, the mold is used to mold a preform for a fan blade. The fiber of the preform is a variable thickness 2.5D woven structure, and the material is 12K T800-grade carbon fiber fabric. The preform had a fiber volume content of 58% ± 3%.

In practice, ACTECH1304 high-toughness liquid molding resin from Miyawa composite Limited is used as the preform injection resin.

In practice, the preform has external dimensions of 780mm by 320mm.

The utility model discloses technical scheme's advantage is:

1. the upper forming die 3 and the lower forming die 4 are made of low-thermal expansion coefficient composite materials, the deformation amount is small in the process of raising and lowering the temperature of the forming dies and is lower than that of metal materials such as die steel, the thermal deformation amount is equivalent to that of Invar steel, the preparation process is simpler than that of a traditional metal die, the manufacturing cost is far lower than that of Invar steel materials, and the cost of an RTM (resin transfer molding) forming die and the manufacturing cost of a composite material part are reduced; the thermal expansion coefficient of the low-thermal expansion coefficient composite material is lower than that of a traditional metal mold, so that the deformation of the mold in the curing and forming process of the composite material member is reduced, and the dimensional accuracy of the formed composite material member is improved;

2. the utility model discloses technical scheme implements simply, and the electric heating mode of use heats the mould, does not need main equipment such as oven, has reduced the manufacturing cost of combined material finished piece, has good RTM technology universality.

Drawings

Figure 1 is the structure schematic diagram of the die of the utility model

FIG. 2 is a schematic view of the combined structure of the upper forming die 3 and the lower forming die 4 in the mold of the present invention

Detailed Description

The following detailed description of the mold of the present invention will be made with reference to the accompanying drawings and examples:

the product aimed at by the embodiment is a blade preform which is a variable thickness 2.5D woven structure fan blade preform made of CCF800, and the fiber volume content of the blade preform material is 58% +/-3%; the CCF800 is a T800-grade carbon fiber fabric with the specification of 12K expanded from Weihai in Shandong, the resin for injection adopts ACTECH1304 high-toughness liquid molding resin of Zhonghang composite material Limited liability company, the overall dimension of the blade preform 20 is 780mm multiplied by 320mm (length multiplied by width), the mold is adopted for processing, as shown in attached figures 1 and 2, the mold for reducing the RTM molding manufacturing cost of the composite material structure comprises an upper molding mold 3 and a lower molding mold 4 which are combined to form an RTM molding cavity, the upper molding mold 3 is a convex mold, and the lower surface of the upper molding is processed by taking the upper surface of a workpiece as a reference; the lower forming die 4 is a concave die, and the upper surface of the lower forming die is processed by taking the lower surface of a workpiece as a reference; a glue inlet 5 is arranged on one side of a lower forming die 4 and is connected with an injection device 7 through a pipeline, a glue outlet 6 is arranged on the other side of the lower forming die 4 opposite to the glue inlet 5 and is connected with a resin recovery device 8 through a pipeline, a thermocouple 9 is also arranged on the side surface of the lower forming die 4 and is used for measuring the temperature in an RTM forming cavity, an upper heater 1 is arranged on the upper forming die 3 and is used for heating the upper forming die 3, a lower heater 2 is arranged below the lower forming die 4 and is used for heating the lower forming die 4, and the upper heating device and the lower heating device are made of 45# steel;

The molding steps for preparing the blade preform are as follows:

1. placing the fiber woven body of the blade preform with the woven fibers in cavities of upper and lower forming

dies

3 and 4, and preheating the upper and lower forming

dies

3 and 4 and the fiber woven body to an injection temperature through upper and

lower heating devices

1 and 2;

2. connecting the resin injection device 8, the resin recovery device 11 and the upper and lower molding dies 3, 4 through pipes and checking the airtightness;

3. injecting preheated resin into the cavities of the upper and lower forming

dies

3 and 4 through a pipeline by a resin injection system 8 to soak the fiber woven body 20;

4. when the cavity is filled with resin and flows out from the glue outlet 6, the glue inlet pipeline and the glue outlet pipeline are closed;

5. continuously heating the upper and lower forming

dies

3 and 4 to the curing temperature of the resin according to the resin process requirement and completing the curing process;

6. and after the resin is cured, cooling the upper and lower forming

dies

3 and 4, and opening the dies to obtain the final product of the composite material product.

The appearance quality and the internal quality of the detected parts meet the design requirements.

Claims

1. The utility model provides a reduce mould of combined material structure RTM shaping manufacturing cost which characterized in that: the mold is characterized in that an RTM molding cavity is formed by closing an upper molding die (3) and a lower molding die (4), one side of the lower molding die (4) is provided with a glue inlet (5) and is connected with an injection device (7) through a pipeline, the other side of the lower molding die (4) opposite to the glue inlet (5) is provided with a glue outlet (6) and is connected with a resin recovery device (8) through a pipeline, the side surface of the lower molding die (4) is also provided with a thermocouple (9) for measuring the temperature in the RTM molding cavity, an upper heater (1) is arranged above the upper molding die (3) for heating the upper molding die (3), and a lower heater (2) is arranged below the lower molding die (4) for heating the lower molding die (4);

the upper forming die (3) and the lower forming die (4) are made of a low-thermal-expansion-coefficient chopped carbon fiber reinforced polymer composite material.

2. A mold for reducing RTM manufacturing costs of a composite structure according to claim 1, wherein: the mold is used for molding a prefabricated body of the fan blade.

3. The mold for reducing the manufacturing cost of RTM forming of composite material structure according to claim 2, wherein: the fiber of the preform is a variable thickness 2.5D woven structure, and the material is 12K T800-grade carbon fiber fabric.

4. A mold for reducing RTM manufacturing costs of a composite structure according to claim 2, wherein: the preform had a fiber volume content of 58% ± 3%.

5. The mold for reducing the manufacturing cost of RTM forming of composite material structure according to claim 2, wherein: the resin for injecting the preform adopts ACTECH1304 high-toughness liquid molding resin of Zhonghang composite material, LLC.

6. A mold for reducing RTM manufacturing costs of a composite structure according to claim 2, wherein: the preform had external dimensions of 780mm by 320mm.