CN118650790A - A method for in-situ curing using double-sided mobile heat sources based on a mobile induction heating mold - Google Patents

A method for in-situ curing using double-sided mobile heat sources based on a mobile induction heating mold Download PDF

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Publication number
CN118650790A
CN118650790A CN202410804278.8A CN202410804278A CN118650790A CN 118650790 A CN118650790 A CN 118650790A CN 202410804278 A CN202410804278 A CN 202410804278A CN 118650790 A CN118650790 A CN 118650790A
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temperature field
heat source
induction heating
thermoplastic composite
mold
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Inventor
何锐涛
殷先硕
周锦涛
李迎光
刘舒霆
郭嘉炜
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0811—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0838—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

A double-side movable heat source cooperative in-situ curing method based on a movable induction heating mold is characterized in that in the process of paving thermoplastic composite materials layer by layer under external pressure, an upper side movable heat source is applied to a to-be-bonded area of the paved materials and the to-be-paved materials, the movable induction heating mold is applied to the lower surfaces of all paved layers, the thickness of a mold panel is less than or equal to 2 times of the corresponding yield depth of an induction heating system, an induction coil is controlled to move on the back surface of the mold, and the structural size, the heating power and the moving path of the coil are regulated to realize double-side cooperative heating of thermoplastic composite material components. The invention ensures that the thermoplastic composite material always keeps small stress and evenly distributes under the synergistic effect of the heat sources at both sides, thereby effectively reducing the residual stress level of the component and reducing the in-situ solidification deformation.

Description

Double-side mobile heat source cooperative in-situ curing method based on mobile induction heating die
Technical Field
The invention relates to a thermoplastic resin matrix composite material curing technology, in particular to a mold heating curing technology, and specifically relates to a double-side mobile heat source synergistic in-situ curing method based on a mobile induction heating mold.
Background
Thermoplastic resin matrix composite materials (hereinafter referred to as thermoplastic composite materials) are light, high in strength, high in impact toughness, capable of being manufactured rapidly and recycled and recreated, and become the optimal materials for improving the comprehensive performance of the high-end equipment of the new generation of aerospace. Taking continuous carbon fiber reinforced polyether-ether-ketone composite (CF/PEEK) as an example, compared with epoxy composite, the specific stiffness is improved by 5%, and the fracture toughness is improved by nearly 10 times. In-situ curing is an important development trend for high-quality, efficient and low-cost manufacture of thermoplastic composite members. In the in-situ curing process, the thermoplastic composite prepreg is laid and simultaneously melted and coagulated. However, the existing in-situ curing method adopts a single-side heat source for heating, and in principle, a serious temperature gradient (taking CF/PEEK as an example, the maximum temperature difference delta T is more than or equal to 360 ℃) in the thickness direction of the component is necessarily formed, so that the residual stress of the component is large and uneven. The large and uneven residual stress causes the components to deform greatly, have low strength and short service life, and even causes curing defects such as interlayer cracking, fiber debonding and the like, so that the method has become one of the root causes for restricting the high-quality in-situ curing of the thermoplastic composite material.
The existing in-situ curing residual stress and deformation control method mainly comprises the steps of advanced heat source on the upper surface, tempering compaction, die heating and the like. 1) Upper surface heat source: the variety, heating range and power density of the upper surface heat source are regulated to improve the interlayer performance of the thermoplastic composite material product to a certain extent, but a serious temperature gradient still exists in the thickness direction. 2) Tempering compaction is typically performed without further addition of material, by heating the original material (typically at a temperature above the glass transition temperature of the material and below the melting temperature) and compacting. CN 117067629 proposes that the curing press roller and the tempering press roller are sequentially arranged on the automatic composite material laying equipment to perform curing compaction and tempering compaction, so that the laying material can be sequentially subjected to in-situ curing compaction and in-situ tempering compaction operation. The method can realize multiple compaction of each layer of laying material in a single movement, reduces the porosity of the product to a certain extent, improves the interlayer bonding strength and reduces the residual stress, but severely limits the in-situ curing efficiency, and the temperature gradient in the thickness direction is not eliminated. 3) And the die is heated, and the temperature gradient in the thickness direction is reduced by integrally heating the substrate, so that the interlayer performance of the thermoplastic composite material product is greatly improved. In the thermoplastic in-situ curing technology, CN 114851592A proposes to enable the mold to generate heat to form an electromagnetic heating mold by the eddy effect of electromagnetic induction, so that the material is cured layer by layer from inside to outside, the porosity of a product is reduced, the interlayer bonding strength of the composite material is improved, and the residual stress level is reduced.
In addition to thermoplastic composite component curing in situ techniques, there are also technical solutions that can be referred to in the broader sense of additive manufacturing techniques. CN 111375766A proposes heating and temperature control of the substrate for additive manufacturing, ensuring the temperature gradient of the forming zone, reducing the residual stress level of the forming. CN 117600618A proposes that the warp deformation of the substrate itself is reduced by adding a heat source on the back of the substrate, so as to reduce the accumulation of the dimension errors of the metal component in the subsequent additive process, and better ensure the dimension precision of the additive manufacturing component. However, in the above method, although the deformation of the substrate is controlled, the temperature of the substrate is far lower than the upper side temperature of the member, and in addition, the influence of the skin depth on the heating depth of the heating mold is not considered, according to which heat is difficult to directly act on the lower surface of the member. Therefore, the method still has difficulty in eliminating the temperature gradient of the component in the thickness direction, and further has difficulty in avoiding large and uneven residual stress, and has the defects of large deformation, low strength, short service life, even interlayer cracking, fiber debonding and the like. More seriously, since residual stress is rapidly accumulated, the large thermoplastic composite member is deformed by buckling and separated from the mold during the automatic wire laying process, so that the automatic wire laying process is difficult to be successfully completed.
The invention discloses a double-side movable heat source cooperative in-situ curing method based on a movable induction heating die, which is characterized in that an eddy current is induced by a movable coil arranged at the back of the die on the lower surface of a thermoplastic composite material component, and a large amount of generated Joule heat directly acts on the lower surface of the composite material member, so that the thermoplastic composite material always keeps small stress and evenly distributes under the synergistic effect of the heat sources at the two sides, and further the residual stress level of the member is effectively reduced, and the in-situ solidification deformation is reduced.
Disclosure of Invention
The invention aims to solve the problem that the existing thermoplastic composite material has large and uneven in-situ curing residual stress, and provides a double-side moving heat source cooperative in-situ curing method based on a moving induction heating die. And introducing a movable induction heating die to the lower surface of the component, applying a movable induction coil to the back of the die, and regulating the structural size, heating power and moving path of the coil to realize double-side cooperative heating of the thermoplastic composite component.
The technical scheme of the invention is as follows:
A double-side movable heat source cooperative in-situ curing method based on a movable induction heating mold is characterized in that in the process of paving thermoplastic composite materials layer by layer under external pressure, an upper side movable heat source is applied to a to-be-bonded area of the paved materials and the to-be-paved materials, the movable induction heating mold is applied to the lower surfaces of all paved layers, the thickness of a mold panel is less than or equal to 2 times of the yield depth corresponding to the frequency of an adopted induction heating system, an induction coil is controlled to move on the back surface of the mold, and the structural size, the heating power and the moving path of the coil are regulated to realize double-side cooperative heating of thermoplastic composite material components.
The center point is the heating focal position of the induction heating heat source, i.e. the main action position of heat radiation or heat conduction of the heating source. For the lower side induction heating source, its center point can be moved synchronously along the track of the thermoplastic composite lay-up layer by layer to ensure that the entire material stack area is heated uniformly during the component manufacturing process. The central plane refers to the plane of symmetry formed by the material of the thermoplastic composite member during the layer-by-layer lay-up. The central surface is gradually raised along with the layering process and is a reference surface of symmetrical temperature distribution formed by layering thermoplastic composite material components layer by layer and heating.
The regulation and control method is characterized in that heat source parameters such as hot spot size, power density, moving speed and the like of an upper side moving heat source are determined according to the melting temperature and interlayer bonding requirement of the thermoplastic composite material, and further, environmental dissipation and anisotropic heat transfer characteristics of the thermoplastic composite material are considered, an upper side inner temperature field Ts (x, y, t) of the thermoplastic composite material part which is paved is calculated or measured, lower side inner temperature fields Tb (x, y, t) of all layers which are paved are calculated, and similarity J of the upper side inner temperature field and the lower side inner temperature field of the thermoplastic composite material part which is paved by the material is defined:
Gb＝{(x,y,t)|Tb(x,y,t)-Te≤Tb(x,y,t)≤Ts(x,y,t)}
Wherein Gs represents the set of all points of the temperature field Ts (x, y, t) in the upper side, gb represents the set of all points of the lower side of which the temperature value falls in the (Tb (x, y, t) -Te, ts (x, y, t)) interval, te represents the deviation threshold, the value of which is set to be 0-10% of the maximum value in Tb (x, y, t), and the structural size and the power density of the lower side induction heating coil are further regulated so that the similarity J is as close to 100% as possible.
The hot spot size refers to the size of a local area heated by the upper and lower side moving heat sources. The power density refers to the heat energy flow rate or heat energy generation power of the heat source in unit area of the upper side and the lower side, and is used for describing the heating intensity of the heat source on the material, namely the heat energy generated by the heat source in unit area. The environmental dissipation refers to the process of dissipating heat by the influence of the external environment in the process, wherein the process comprises three forms of convection, radiation and conduction heat dissipation. The in-plane temperature field refers to the temperature distribution condition inside the material, in particular to the temperature distribution in the surface of the material. In this method, it is necessary to calculate the in-plane temperature field of the laid-up skin material and the in-plane temperature fields of the lower surfaces of all layers in order to evaluate the temperature distribution during heating and curing of the material.
The heat source parameter adjustment method may be adjusted offline according to the in-plane temperature field T s (x, y, T) of the laid-up skin material and the in-plane temperature field T b (x, y, T) of the lower surface. The temperature field data of T s (x, y, T) and T b (x, y, T) which are obtained by on-line monitoring of the thermal infrared imager, the thermocouple and the optical fiber isothermal sensor can be adjusted on line. The specific adjusting method comprises the following steps: and calculating the temperature field similarity J through the in-plane temperature field T s (x, y, T) of the paved surface layer material and the in-plane temperature field T b (x, y, T) of the lower surface, and realizing the symmetrical distribution of the lower induction heating heat source and the upper heat source in the process window by taking the temperature field similarity J as a criterion, so that the temperature field similarity J is as close to 100 percent as possible.
The invention is characterized in that if the induction heating source is used for in-situ solidification of the thermoplastic composite material: in the traditional thinking, a thermoplastic composite material is heated and cured layer by layer from the upper side by utilizing a single-side heat source, and in principle, a serious temperature gradient exists in the thickness direction (taking CF/PEEK as an example, the maximum temperature difference delta T is more than or equal to 360 ℃), so that the residual stress of a component is large and uneven. The invention provides an induction heating power supply arranged at the lower side of a die, and residual stress generated by curing the thermoplastic composite material is reduced through uniform distribution of heat sources at two sides.
The beneficial effects of the invention are as follows:
1. the heat sources are moved on the upper side and the lower side of the thermoplastic composite material, so that the material in-situ curing stress is small and uniformly distributed.
2. The movable induction heating die provides a quick response, sensitive and controllable dynamic movable heat source for the lower side of the thermoplastic composite material.
3. According to the calculation, a specific alternating current frequency range of 1-5 kHz is selected, so that the magnetic field is ensured not to penetrate through the die.
4. The heating speed is high. Because the interior of the workpiece heats up due to the induced eddy currents, induction heating has a faster heating rate than the conduction heating method of the prior art.
5. The starting speed is high. The prior art has larger thermal inertia, and the preheating is needed during the starting, and the induction heating process is to heat the inside of the die, so that the starting speed is greatly increased.
6. Energy saving. Because of the fast restarting speed, the induction heating power supply can be turned off when not in use.
7. The productivity is high. Induction heating can increase the yield due to the short heating time.
8. The working environment is good. The heat of induction heating is generated from the inside of the mold, and because the heating speed is high, the heat dissipation around the work station is almost negligible.
9. Is more suitable for curing and heating the thermoplastic composite material. By the advantages, the heating speed is high, the production efficiency is high, the safety is higher, and the energy-saving and environment-friendly effects are achieved, so that the thermoplastic composite material is more suitable.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a method for in situ curing of thermoplastic composite members by a dual side mobile heat source based on die induction heating according to the present invention.
Wherein, 1-the mould; 3-thermoplastic prepregs; 4-laser source (upper side heat source); 5-a roller; 6-moving induction heating coil.
Detailed Description
The application is further elucidated below in connection with the drawings and the embodiments. It should be noted that the following examples are only illustrative of some specific examples of the method and are not intended to limit the scope of the application. Furthermore, any modifications and variations which may be made by those skilled in the art based on the principles of the thermoplastic composite member in situ curing method of the present application after having been disclosed herein are intended to be within the scope of the application as defined in the appended claims.
The following is a thermoplastic composite member double-sided mobile heat source in-situ curing method based on die induction heating.
As shown in fig. 1.
The present embodiment is described taking in-situ solidification of a plate member by a double-sided moving heat source based on induction heating of a mold as an example, and includes: a mould 1 for providing support, a thermoplastic composite prepreg 3 for forming the component, an upper heat source laser source 4 for providing thermoplastic composite bonding, rollers 5 for providing lay-up and curing pressure, a lower heat source mobile induction heating coil 6 for providing a mirrored temperature field.
The components are paved by adopting carbon fiber reinforced thermoplastic resin-based prepreg 3 (T700/PEEK, fiber mass fraction is 66%), wherein the layering mode is [0] 16, the size of single-layer prepreg is 6.35mm multiplied by 100mm, and the thickness is 0.125 mm; the upper side heat source adopts a laser source 4, the laser source has the wavelength of lambda=980 nm, and the light spot is a rectangular light spot of 7×20 mm; the lower side heat source adopts a movable induction coil 6 to apply high-frequency alternating current induction heating to the metal mold, and performs closed-loop proportional, integral and derivative (PID) control on the mold temperature through an external temperature control meter (by adjusting current intensity and frequency), and generates non-uniformly distributed Joule heat which is identical to the distribution of the upper surface temperature field of the component through cooperation with the movement of the upper side laser heat source, so that a dynamic temperature field synchronous along the laying track is finally formed. The steps of the specific embodiment are as follows:
step one: preparing materials and equipment such as a mould, a laser source, a mobile induction coil and the like required by manufacturing a carbon fiber reinforced thermoplastic resin-based prepreg (T700/PEEK) and a component, and preprocessing the prepreg to ensure that the performance of the prepreg reaches an optimal state;
Step two: the movable induction coil is arranged below the metal mold, joule heat is generated through high-frequency alternating current induction heating, the lower heating is provided, an external temperature control meter is connected with the metal mold, the mold temperature can be monitored in real time, and the current intensity and frequency of the induction heating system are regulated by using a closed-loop proportional, integral and derivative (PID) control algorithm so as to maintain the stability of the mold temperature in a set value range.
Step three: and setting upper laser source parameters including spot size, power density and moving speed, adjusting an induction heating system, and keeping the moving speed of the moving induction coil consistent with the moving speed of the laser source.
Step four: simultaneously starting an upper laser source and a lower induction heating system to heat and solidify the layered prepreg, monitoring a temperature field on the upper surface by using a thermal infrared imager to obtain T s (x, y, T), embedding 10 fiber gratings on the lower surface for temperature monitoring, obtaining T b (x, y, T) by interpolation, and calculating to obtain a temperature similarity J;
Step five: along with the changes and differences of the number of the layers, the environmental dissipation, the anisotropic heat transfer characteristics of the materials and the like, the heat source parameters such as the laser source spot size, the power density, the moving speed and the like of the upper laser heat source and the heat source parameters such as the current and the like of the lower induction heating system need to be controlled and regulated in a coordinated manner, so that the similarity J of the temperature field is as close to 100% as possible.
According to the embodiment, on the premise of ensuring the material performance, the temperature fields of the components are cooperatively regulated and controlled through the double-side movable heat source, so that the mirror image temperature fields which are symmetrical along the whole process of the central planes of all the paved layers are realized, the high-quality high-precision in-situ curing is realized, the high-quality high-precision in-situ curing of the plate is realized by utilizing the steps, and the curing deformation can be reduced by more than 50%.
The invention is not related in part to the same as or can be practiced with the prior art.

Claims (7)

1.一种基于移动式感应加热模具的双侧移动热源协同原位固化方法，其特征在于,热塑性复合材料在外部压力下逐层铺叠过程中，在已铺叠材料与即将铺叠材料的待粘合区域施加上侧移动热源，在已铺叠所有层的下表面施加移动式感应加热模具，模具面板的厚度小于等于所采用感应加热系统所对应屈服深度的2倍，控制感应线圈在模具的背面移动，调控线圈的结构尺寸、加热功率和移动路径实现热塑性复合材料构件双侧协同加热。1. A method for coordinated in-situ curing of double-sided mobile heat sources based on a mobile induction heating mold, characterized in that, during the layer-by-layer stacking of thermoplastic composite materials under external pressure, an upper mobile heat source is applied to the area to be bonded between the stacked materials and the materials to be stacked, and a mobile induction heating mold is applied to the lower surface of all the stacked layers. The thickness of the mold panel is less than or equal to twice the yield depth corresponding to the adopted induction heating system. The induction coil is controlled to move on the back of the mold, and the structural size, heating power and moving path of the coil are adjusted to achieve coordinated heating of the thermoplastic composite components on both sides. 2.根据权利要求1所述的方法，其特征在于：所述的调控方法根据热塑性复合材料的熔融温度和层间粘合需求确定上侧移动热源的热源参数，进而虑及环境耗散和热塑性复合材料各向异性传热特性，计算或测量已铺叠热塑性复合材料零件上侧面内温度场Ts(x,y,t)，计算或测量已铺叠所有层下侧面内温度场Tb(x,y,t)，定义材料已铺叠热塑性复合材料零件上侧面内温度场和下侧面内温度场相似度J：2. The method according to claim 1 is characterized in that: the control method determines the heat source parameters of the upper mobile heat source according to the melting temperature of the thermoplastic composite material and the interlayer bonding requirements, and then takes into account the environmental dissipation and the anisotropic heat transfer characteristics of the thermoplastic composite material, calculates or measures the temperature field T s (x, y, t) inside the upper side of the stacked thermoplastic composite part, calculates or measures the temperature field T b (x, y, t) inside the lower side of all the stacked layers, and defines the similarity J of the temperature field inside the upper side and the temperature field inside the lower side of the stacked thermoplastic composite part: 其中Gs代表所述上侧面内温度场Ts(x,y,t)所有点的集合，Gb代表温度值落在(Tb(x,y,t)-Te,Ts(x,y,t))区间内的下侧所有点的集合，Te代表偏差阈，其值设置为Tb(x,y,t)中最大值的0～10％，进一步调控下侧感应加热线圈的结构尺寸和功率密度使所述相似度J尽可能接近100％。Wherein Gs represents the set of all points of the temperature field Ts (x, y, t) in the upper side, Gb represents the set of all points on the lower side whose temperature values fall within the interval ( Tb (x, y, t) -Te , Ts (x, y, t)), Te represents the deviation threshold, and its value is set to 0-10% of the maximum value in Tb (x, y, t), and the structural size and power density of the lower side induction heating coil are further adjusted to make the similarity J as close to 100% as possible. 3.根据权利要求1所述的方法，其特征在于：所述的热源参数包括热斑尺寸、功率密度和移动速度。所述热斑尺寸是指上、下侧移动热源加热的局部区域的大小。3. The method according to claim 1, characterized in that: the heat source parameters include hot spot size, power density and moving speed. The hot spot size refers to the size of the local area heated by the upper and lower moving heat sources. 4.根据权利要求3所述的方法，其特征在于：所述功率密度是指上、下侧移动热源单位面积内的热能流量或热能产生功率，用来描述热源对材料加热的强度，即单位面积内热源产生的热能量。4. The method according to claim 3 is characterized in that: the power density refers to the heat energy flow or heat energy generation power per unit area of the upper and lower moving heat sources, which is used to describe the intensity of heating the material by the heat source, that is, the heat energy generated by the heat source per unit area. 5.根据权利要求2所述的方法，其特征在于：所述环境耗散是指在工艺过程中，材料受到外部环境的影响而散失热量的过程，其中包括对流、辐射、传导散热三种形式。5. The method according to claim 2 is characterized in that: the environmental dissipation refers to the process in which the material loses heat due to the influence of the external environment during the process, which includes three forms of heat dissipation: convection, radiation, and conduction. 6.根据权利要求2所述的方法，其特征在于：所述面内温度场是指材料内部的温度分布情况，特指在材料表面内的温度分布；需要计算已铺叠的表层材料的面内温度场以及所有层的下表面的面内温度场，以便评估材料的加热和固化过程中的温度分布情况。6. The method according to claim 2 is characterized in that: the in-plane temperature field refers to the temperature distribution inside the material, specifically the temperature distribution on the surface of the material; it is necessary to calculate the in-plane temperature field of the stacked surface material and the in-plane temperature field of the lower surface of all layers in order to evaluate the temperature distribution during the heating and curing process of the material. 7.根据权利要求3所述的方法，其特征在于：所述热源参数的调整方法是根据所述已铺叠的表层材料的面内温度场Ts(x,y,t)和下表面的面内温度场Tb(x,y,t)离线调整；或7. The method according to claim 3, characterized in that: the heat source parameter adjustment method is offline adjustment based on the in-plane temperature field T s (x, y, t) of the laid surface material and the in-plane temperature field T b (x, y, t) of the lower surface; or 依据红外热像仪、热电偶、光纤温度传感器在线监测获得的Ts(x,y,t)和Tb(x,y,t)温度场数据进行在线调节；通过已铺叠的表层材料的面内温度场Ts(x,y,t)与下表面的面内温度场Tb(x,y,t)计算温度场相似度J，以温度场相似度J为判据，在工艺窗口内实现下侧感应加热热源与上侧热源的对称分布，使温度场相似度J接近100％。Online adjustment is performed based on the temperature field data Ts (x,y,t) and Tb (x,y,t) obtained through online monitoring by infrared thermal imagers, thermocouples, and optical fiber temperature sensors. The temperature field similarity J is calculated by the in-plane temperature field Ts (x,y,t) of the stacked surface material and the in-plane temperature field Tb (x,y,t) of the lower surface. Based on the temperature field similarity J, a symmetrical distribution of the lower induction heating heat source and the upper heat source is achieved within the process window, so that the temperature field similarity J is close to 100%.
CN202410804278.8A 2024-06-20 2024-06-20 A method for in-situ curing using double-sided mobile heat sources based on a mobile induction heating mold Pending CN118650790A (en)

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