CN118578562A - A method for in-situ curing of thermoplastic composite components with double-sided mobile heat sources based on an addressable heating mold - Google Patents
A method for in-situ curing of thermoplastic composite components with double-sided mobile heat sources based on an addressable heating mold Download PDFInfo
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- CN118578562A CN118578562A CN202410801471.6A CN202410801471A CN118578562A CN 118578562 A CN118578562 A CN 118578562A CN 202410801471 A CN202410801471 A CN 202410801471A CN 118578562 A CN118578562 A CN 118578562A
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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
- 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
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
-
- 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
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
- B29C2035/046—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames dried air
-
- 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
- B29C2035/0822—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 IR 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
- 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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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Toxicology (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
A thermoplastic composite material component double-side movable heat source in-situ curing method based on an addressable heating mould is characterized in that thermoplastic composite material is heated and pressurized by an in-situ curing laying head to bond a material to be laid with the laid material, and simultaneously the lower side of the material is heated by the mould at a corresponding position, a heating position center point of the mould and a heating center point of a heat source of the laying head move cooperatively along a laying track, and parameters such as an action space, power density and the like of the movable heat sources of the upper laying head and the movable heat source of the lower mould are regulated and controlled respectively to cooperatively heat the upper side and the lower side of the material. The invention can ensure that the whole part is tightly attached to the die in the in-situ curing process of the thermoplastic composite material, and effectively reduces the curing residual stress of the component, thereby improving the forming precision and mechanical property of the in-situ cured component.
Description
Technical Field
The invention relates to a composite material manufacturing technology, in particular to a composite material ground material curing technology, and in particular relates to a thermoplastic composite material component double-side movable heat source in-situ curing method based on an addressable heating die.
Background
The thermoplastic resin matrix composite (hereinafter referred to as thermoplastic composite) has the advantages of light weight, high strength, high impact toughness, rapid forming, easy recovery and reconstruction, and has become a preferred material for improving the comprehensive performance of the high-end equipment of the new generation of aerospace. In-situ curing is one of the important development trends of high-quality, high-efficiency and low-cost manufacturing 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 reasons 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 methods of upper surface heat source, tempering compaction, mold heating and the like. 1) Upper surface heat source: the interlayer performance of the thermoplastic composite material product can be improved to a certain extent by regulating and controlling the heating power and the action range of the upper surface heat source, 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. CN117067629 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. CN111375766a 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. CN117600618a proposes to reduce warp deformation of the substrate itself by adding a heat source to the back of the substrate, so as to reduce the accumulation of dimensional errors of the metal component in the subsequent additive process, and better ensure the dimensional accuracy of the additive manufacturing component. However, the above method still has difficulty in avoiding the temperature gradient on the upper side and the lower side of the component, and further causes large and uneven residual stress, so that the component is large in deformation, low in strength and short in service life, and even curing defects such as interlayer cracking, fiber debonding and the like occur. 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.
Disclosure of Invention
The invention aims to solve the problem of large residual stress caused by large temperature gradient in the thickness direction of a material in the existing thermoplastic composite material in-situ curing process, and provides a thermoplastic composite material component double-side movable heat source in-situ curing method based on an addressable heating die. And a pixelated distributed, local and dynamic addressable heating source is introduced to the upper surface of the die, and the pixelated distributed, local and dynamic addressable heating source and the upper-side laying head heat source are cooperated to heat the upper surface and the lower surface of the material so as to reduce the residual stress generated in the material in-situ curing process, thereby improving the mechanical property of the component and prolonging the service life.
The technical scheme of the invention is as follows:
a thermoplastic composite material component double-side movable heat source in-situ curing method based on an addressable heating die is characterized in that
Step 1: the thermoplastic composite material belt is bonded with the upper layer of paved material layer by layer under the heating and pressurizing actions of a movable heat source of an in-situ solidification paving head and a compression roller;
step 2: an addressable heating mould is arranged below the paved material, and the instantaneous heating position and the heating power of the addressable heating mould can be dynamically regulated and controlled;
Step 3: taking a contact point of the paved material with the surface of the die at the bonding position along the layer thickness direction, and controlling a heat source of an addressable heating die to heat the contact point, wherein a heating position center point of the addressable heating die and a heating center point of a heat source of a paving head synchronously move along a paving track;
Step 4: and respectively regulating and controlling the heat source size, power density and other parameters of the upper laying head moving heat source and the part lower addressable heating die moving heat source to cooperatively heat the upper side and the lower side of the material. .
The heating center is a main action position of heat source of the laying head and heat output by the heating mould, and the main action position is respectively positioned on the upper surface and the lower surface of the manufactured thermoplastic composite material component. The heating centers of the two moving heat sources move synchronously along the track of the thermoplastic composite material layer by layer to ensure that the temperature fields in the thickness direction are symmetrically distributed in the component manufacturing process.
The upper side non-contact type movable heat source refers to a heating mode which is adopted and does not have solid or liquid entity to be in direct contact with a material, such as infrared irradiation, pulse light irradiation, laser irradiation, hot air convection and the like.
The addressable heating die can accurately heat any appointed position on the die and the size of a heating area, and has the functional characteristics of local heating, dynamic controllability and the like for the whole die.
The heat source regulation and control method can regulate and control parameters such as heat source acting space, power density and the like through various development boards and by combining control algorithms such as proportional-differential integral and the like.
The beneficial effects of the invention are as follows:
Compared with the traditional single-side heat source in-situ curing, the pixelated distributed addressable heat source is introduced at the side of the die, and the pixelated addressable heat source and the upper side laying head heat source can cooperate to add the upper side and the lower side of the composite material, so that the temperature gradient in the thickness direction of the material in the in-situ curing process is greatly reduced, the residual stress and deformation are reduced, and the mechanical property of the component is improved.
According to the thermoplastic composite material component double-side movable heat source in-situ curing method based on the addressable heating die, pixelated distributed, local and dynamically adjustable addressable heating sources are introduced into the die, and the addressable heating sources and the upper laying head heat sources are cooperated to heat the upper surface and the lower surface of the material so as to reduce residual stress generated in the in-situ curing process of the part, so that the mechanical property of the component is improved, and the service life is prolonged.
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 a die embedded distributed heating film according to the present invention
FIG. 2 is a schematic illustration of one possible internal structure of a single pixelized heating film in an embodiment of the invention
Wherein, 1-a laser heat source; 2-thermoplastic prepregs; 3-pixelated distributed heating film; 4-a press roller; 5-die.
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 in situ curing method of thermoplastic composite members of the present application after having been disclosed herein are intended to fall within the scope of the application as defined in the appended claims.
The following is based on the pixelized distributed electric heating film embedded on the upper surface of the mold
As shown in fig. 1, this embodiment is illustrated by taking in-situ solidification of a plate member based on a double-sided moving heat source of a mold embedded distributed heating film as an example, and includes: a laser heat source 1 for heating the composite material to ensure bonding, a carbon fiber reinforced thermoplastic resin-based prepreg 2 for forming a member, a pixelized distributed electric heating film 3 for heating an underlying material, a press roll 4 for providing a material bonding pressure, and a die 5 for ensuring the shape and size of a part.
The components are paved by adopting carbon fiber reinforced thermoplastic resin-based prepreg 2 (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 200mm, and the thickness is 0.125 mm; the upper side heat source adopts a laser source 1, 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 pixelated distributed heating film 3, as shown in fig. 2, each pixelated heating area is connected with a circuit with controllable voltage, and the temperature of the heating film is subjected to closed-loop proportional, integral and derivative (PID) zoned voltage regulation (so as to regulate heating power) by an external temperature control device, so that the upper surface and the lower surface of a material are cooperatively heated by the upper side laying head heat source, and the specific embodiment comprises the following steps:
step one: preparing materials and equipment such as a mould, a laser source, a distributed heating film 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: dividing the component along the laying direction according to the spot size of the laser source, dividing 200mm into 20 continuous areas, wherein each area is 10mm, and continuously and independently embedding a heating film unit with the size of 10mm into a die;
Step three: setting upper laser source parameters including spot size, power density and moving speed, setting initial voltage, power-on time and other parameters of a lower distributed heating film according to the set upper laser source parameters, and performing closed-loop PID control through an external temperature control device;
step four: 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 laser source spot size, the power density, the moving speed and other heat source parameters of the upper laser heat source and the lower heating film unit are controlled and regulated in a coordinated manner at any time.
According to the embodiment, on the premise that good bonding contact between the material and the die is ensured, the upper side and the lower side of the component are cooperatively heated through the double-side movable heat source, so that residual stress in the component curing process is reduced, high-quality in-situ curing is achieved, high-quality in-situ curing of the plate is achieved through the steps, and 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 (4)
1. A thermoplastic composite material component double-side movable heat source in-situ curing method based on an addressable heating die is characterized by comprising the following steps of:
Step 1: bonding the thermoplastic composite material strips with the upper layer of paved materials layer by layer under the heating and pressurizing actions of a moving heat source of an in-situ solidification paving head and a compression roller;
Step 2: an addressable heating mould is arranged below the paved material, and the instantaneous heating position and the heating power of the addressable heating mould can be dynamically regulated and controlled;
Step 3: taking a contact point of the paved material with the surface of the die at the bonding position along the layer thickness direction, and controlling a heat source of an addressable heating die to heat the contact point, wherein a heating position center point of the addressable heating die and a heating center point of a heat source of a paving head synchronously move along a paving track;
Step 4: and respectively regulating and controlling the heat source size and the power density of the upper-side laying head moving heat source and the heat source size and the power density of the part lower-side addressable heating die moving heat source to cooperatively heat the upper side and the lower side of the material.
2. The method according to claim 1, characterized in that: the upper laying head heat source heats the thermoplastic composite material through an infrared irradiation, laser irradiation, hot air convection and pulse light irradiation non-contact heating method.
3. The method according to claim 1, characterized in that: the addressable heating die is characterized in that the addressable heating die is provided with a plurality of uniformly distributed small heaters in a pixelated distribution mode on the upper surface of the die, and the opening time and the heating power of the small heaters at different positions of the die are controlled to realize the movable heating of a heat source at the lower side of the part.
4. The method according to claim 1, characterized in that: the addressable heat source at the die side accurately regulates and controls the output temperature through a singlechip, a PLC electronic module and a proportional-derivative integral (PID) control algorithm so as to ensure that the output heat quantity of the addressable heat source is similar to that of the heat source of the upper laying head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410801471.6A CN118578562A (en) | 2024-06-20 | 2024-06-20 | A method for in-situ curing of thermoplastic composite components with double-sided mobile heat sources based on an addressable heating mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410801471.6A CN118578562A (en) | 2024-06-20 | 2024-06-20 | A method for in-situ curing of thermoplastic composite components with double-sided mobile heat sources based on an addressable heating mold |
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| CN118578562A true CN118578562A (en) | 2024-09-03 |
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