Composite material temperature distribution control method in OoA process

Abstract

The invention discloses a composite material temperature distribution control method in an OoA process, which comprises the following steps: aluminum-foil paper is used as a composite material surface heat absorption material, the surface of the aluminum-foil paper is subjected to air guide hole pricking treatment, the number of high-density holes P1 of the aluminum-foil paper is more than 10 holes / cm < 2 >, the number of medium-density holes P2 of the aluminum-foil paper is 5-10 holes / cm < 2 >, and the number of low-density holes P3 of the aluminum-foil paper is designed to be less than 5 holes / cm < 2 >; the temperature distribution control of the composite material comprises the following steps: a, selecting the density of aluminum-foil paper holes according to the structure and air guide requirements of the composite material, adopting aluminum-foil paper low-density holes P3 for the composite material with a plane structure, adopting aluminum-foil paper high-density holes P1 for the composite material with a thick wall structure, and adopting aluminum-foil paper medium-density holes P2 for the composite material with a multi-layer structure; according to the composite material temperature distribution control method in the OoA process, the aluminum foil paper serves as a surface heat absorption material, heat can be rapidly absorbed and transferred into the composite material, and rapid and uniform heating is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material production, and in particular to a method for controlling temperature distribution of composite materials in an OoA process. Background Art

[0002] In the manufacturing process of composite materials, temperature control is one of the key factors to ensure the performance and quality of materials. Traditional composite curing processes often require equipment such as autoclaves to achieve uniform heating and curing, but such equipment is expensive and complex to operate. In recent years, with the development of OoA processes, people have begun to seek more economical and flexible composite processing methods.

[0003] At present, the conventional OoA process, especially the curing furnace curing molding process, has a lower heat transfer efficiency than the autoclave process, and the product is prone to local delamination or diffusion defects after curing. In addition, the use of other auxiliary materials or process optimization defects will increase production costs or extend production cycles.

[0004] Therefore, we propose a method for controlling temperature distribution of composite materials in OoA process to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a method for controlling temperature distribution of composite materials in an OoA process, so as to solve the currently commonly used problems raised by the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for controlling the temperature distribution of a composite material in an OoA process, wherein aluminum foil is used as a heat-absorbing material on the surface of the composite material, the surface of the aluminum foil is subjected to an air-guiding pore treatment, and the number of high-density holes P1 of the aluminum foil is greater than 10 holes / cm 2 The number of holes in the medium-density holes P2 of aluminum foil is 5-10 holes / cm 2 The low-density holes P3 of aluminum foil are designed to be less than 5 holes / cm 2 ;

[0007] Composite material temperature distribution control includes the following steps:

[0008] a. The pore density of aluminum foil is selected according to the structure and air conduction requirements of the composite material. For planar structure composite materials, low-density aluminum foil pores P3 are used; for thick-walled structure composite materials, high-density foil pores P1 are used; for multi-layer structure composite materials, medium-density aluminum foil pores P2 are used;

[0009] b. Using aluminum foil as the surface layer of the composite laminate structure and placing it in high-risk areas prone to defects;

[0010] c. Optimize the position, size and quantity of aluminum foil according to the size, shape and curing requirements of the composite material;

[0011] d. In the OoA process, the composite material is heated by an external heat source; the aluminum foil quickly absorbs the external heat and transfers the heat to the interior of the composite material, achieving rapid and uniform heating; the aluminum foil acts as a heat insulator during the curing process;

[0012] e. Use temperature sensors and infrared imaging equipment to monitor the regional temperature distribution of composite materials in real time, obtain temperature data of different areas of the composite materials during the curing process, adjust the heating parameters and the placement and amount of aluminum foil, and adjust the heating parameters according to the following rules: when the regional temperature difference is greater than 5°C, increase the heating power of the low-temperature area or increase the number of aluminum foil layers; when the regional temperature difference is less than 2°C, maintain the current heating parameters; when the local area is overheated, reduce the number of aluminum foil layers or increase the hole diameter.

[0013] Preferably, the thermal conductivity of the aluminum foil is 200-235 W / (m·K) and the thickness is 10-20 μm.

[0014] Preferably, the diameter of the holes in the aluminum foil is 0.3-0.7 mm.

[0015] Preferably, the number of high-density holes P1 of the thick-walled aluminum foil is 12 holes / cm 2 , the hole diameter is 0.5mm.

[0016] Preferably, in the thin wall or edge area, the low density hole P3 of the aluminum foil is 3 holes / cm 2 , the hole diameter is 0.4mm.

[0017] Preferably, the heating source is an infrared heating device, a curing oven or other external controllable heat source, and the heating power density ranges from 5 to 15 W / cm 2 .

[0018] Compared with the prior art, the beneficial effects of the present invention are: a method for controlling temperature distribution of composite materials in the OoA process;

[0019] 1. Select aluminum foil with high thermal conductivity and good mechanical properties as the surface heat absorption material, and pre-treat the aluminum foil by punching air holes to improve its heat absorption and air permeability;

[0020] 2. In the laminated structure of the composite material, the aluminum foil is used as the surface layer. The position and quantity of the aluminum foil are optimized according to the size, shape and curing requirements of the composite material;

[0021] 3. In the OoA process, the composite material is heated by an external heat source; aluminum foil, as a surface heat-absorbing material, can quickly absorb and transfer heat to the inside of the composite material, achieving rapid and uniform heating. During the curing process, aluminum foil can also play a certain role in heat insulation, preventing heat from dissipating too quickly and ensuring the quality of curing;

[0022] 4. Use temperature sensors and imaging technology to monitor the temperature distribution of the composite material in real time, and adjust the heating parameters and the position of the aluminum foil according to the monitoring results to achieve the best curing effect. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a technical solution: a method for controlling the temperature distribution of a composite material in an OoA process, wherein aluminum foil is used as a heat-absorbing material on the surface of the composite material, the surface of the aluminum foil is subjected to an air-guiding hole treatment, and the number of high-density holes P1 of the aluminum foil is greater than 10 holes / cm 2 The number of holes in the medium-density holes P2 of aluminum foil is 5-10 holes / cm 2 The low-density holes P3 of aluminum foil are designed to be less than 5 holes / cm 2 ;

[0025] Composite material temperature distribution control includes the following steps:

[0026] a. The pore density of aluminum foil is selected according to the structure and air conduction requirements of the composite material. For planar structure composite materials, low-density aluminum foil pores P3 are used; for thick-walled structure composite materials, high-density foil pores P1 are used; for multi-layer structure composite materials, medium-density aluminum foil pores P2 are used;

[0027] b. Using aluminum foil as the surface layer of the composite laminate structure and placing it in high-risk areas prone to defects;

[0028] c. Optimize the position, size and quantity of aluminum foil according to the size, shape and curing requirements of the composite material;

[0029] d. In the OoA process, the composite material is heated by an external heat source; the aluminum foil quickly absorbs the external heat and transfers the heat to the interior of the composite material, achieving rapid and uniform heating; the aluminum foil acts as a heat insulator during the curing process;

[0030] e. Use temperature sensors and infrared imaging equipment to monitor the temperature distribution of composite materials in real time, obtain temperature data of different areas of composite materials during the curing process, adjust heating parameters and the placement and quantity of aluminum foil, and adjust heating parameters according to the following rules: when the regional temperature difference is greater than 5°C, increase the heating power of the low temperature area or increase the number of aluminum foil layers; when the regional temperature difference is less than 2°C, maintain the current heating parameters; when the local area is overheated, reduce the number of aluminum foil layers or increase the hole diameter;

[0031] Aluminum foil is mainly used as an auxiliary material in the OoA molding process. When the product is stacked and assembled, it is placed on the surface of the product, in the defect-prone area, to improve product quality and increase the product qualification rate. In the OoA process research, the air conduction of the product is more important, and the aluminum foil needs to be punched in advance to increase the air conduction.

[0032] According to the shape, size and gas conduction requirements of the composite material, the aluminum foil is pre-treated as follows: the hole density and pore size are set according to the gas conduction requirements; for planar structure composite materials, low-density holes P3 of aluminum foil are used, for thick-walled structure composite materials, high-density holes P1 of foil are used, and for multi-layer structure composite materials, medium-density holes P2 of aluminum foil are used. The hole density is increased in complex shape areas to enhance the gas conduction effect. The aluminum foil is cut according to the size and shape of the composite material to ensure that it covers the key areas, especially the high thickness or complex geometric areas.

[0033] The composite material is heated by an external heat source, and the initial power is set (e.g., 50 W / cm 2 ), preheat slowly at low temperature to avoid defects caused by excessive initial temperature difference. Through the high thermal conductivity of aluminum foil, heat is quickly transferred to the inside of the composite material, achieving fast and uniform heating. Use multi-point temperature sensors to collect the temperature of each area of ​​the composite material in real time; transmit the data to the data analysis module to generate a heat distribution map.

[0034] Lay the treated aluminum foil on the surface of the composite material, and increase the number of aluminum foil covering layers in thick wall areas, edge areas, and curved surfaces or inner corners where gas is easy to accumulate where heat is difficult to transfer. For high-thickness composite materials, add aluminum foil interlayers between different layers to form a multi-channel structure for heat transfer and gas conduction. The position of the aluminum foil is adjusted in real time according to the temperature sensor data to optimize the coverage range.

[0035] Calculate the temperature difference of each area and determine whether there is local overheating or insufficient heating; if an abnormality is found, generate heating parameter adjustment suggestions. Increase or decrease the heating power, adjust the heating time or equipment position; adjust the coverage and number of layers of aluminum foil as needed. Continuously collect temperature data during the heating process to ensure that the curing temperature of the composite material is controlled within the set range. When the regional temperature difference is greater than 5°C, increase the heating power in the low temperature area or increase the number of layers of aluminum foil. When the regional temperature difference is less than 2°C, maintain the current heating parameters. When the local area is overheated, reduce the number of aluminum foil covers or increase the hole diameter. This is the entire working process of the composite material temperature distribution control method in the OoA process.

[0036] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The standard parts used in the present invention can be purchased from the market, and the specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling temperature distribution of composite materials in an OoA process, characterized in that: Aluminum foil is used as the heat absorbing material on the surface of the composite material. The surface of the aluminum foil is treated with air guide holes. The number of high-density holes P1 of the aluminum foil is greater than 10 holes / cm 2 The number of holes in the medium-density holes P2 of aluminum foil is 5-10 holes / cm 2 The low-density holes P3 of aluminum foil are designed to be less than 5 holes / cm 2 ; Composite material temperature distribution control includes the following steps: a. The pore density of aluminum foil is selected according to the structure and air conduction requirements of the composite material. For planar structure composite materials, low-density aluminum foil pores P3 are used; for thick-walled structure composite materials, high-density foil pores P1 are used; for multi-layer structure composite materials, medium-density aluminum foil pores P2 are used; b. Using aluminum foil as the surface layer of the composite laminate structure and placing it in high-risk areas prone to defects; c. Adjust the position, size and quantity of aluminum foil according to the size, shape and curing requirements of the composite material; d. In the OoA process, the composite material is heated by an external heat source; the aluminum foil quickly absorbs the external heat and transfers the heat to the interior of the composite material, achieving rapid and uniform heating; the aluminum foil acts as a heat insulator during the curing process; e. Use temperature sensors and infrared imaging equipment to monitor the regional temperature distribution of composite materials in real time, obtain temperature data of different areas of the composite materials during the curing process, adjust the heating parameters and the placement and amount of aluminum foil, and adjust the heating parameters according to the following rules: when the regional temperature difference is greater than 5°C, increase the heating power of the low-temperature area or increase the number of aluminum foil layers; when the regional temperature difference is less than 2°C, maintain the current heating parameters; when the local area is overheated, reduce the number of aluminum foil layers or increase the hole diameter.

2. The method for controlling temperature distribution of composite materials in an OoA process according to claim 1, characterized in that: The thermal conductivity of the aluminum foil is 200-235 W / (m·K) and the thickness is 10-20 μm.

3. The method for controlling temperature distribution of composite materials in an OoA process according to claim 1, characterized in that: The diameter of the holes in the aluminum foil is 0.3-0.7 mm.

4. The method for controlling temperature distribution of composite materials in an OoA process according to claim 2, characterized in that: The number of high-density holes P1 in the thick-walled area of ​​the aluminum foil is 12 holes / cm 2 , the hole diameter is 0.5mm.

5. The method for controlling temperature distribution of composite materials in an OoA process according to claim 2, characterized in that: In thin wall or edge area, the low density hole P3 of aluminum foil is 3 holes / cm 2 , the hole diameter is 0.4mm.

6. The method for controlling temperature distribution of composite materials in an OoA process according to claim 1, characterized in that: The heating source is an infrared heating device, a curing oven or other external controllable heat source, and the heating power density range is 5-15W / cm 2 .