CN112571830A - U-shaped beam and manufacturing method thereof - Google Patents

U-shaped beam and manufacturing method thereof Download PDF

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Publication number
CN112571830A
CN112571830A CN202011382266.9A CN202011382266A CN112571830A CN 112571830 A CN112571830 A CN 112571830A CN 202011382266 A CN202011382266 A CN 202011382266A CN 112571830 A CN112571830 A CN 112571830A
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CN
China
Prior art keywords
prepreg
shaped
curing
laying
treatment
Prior art date
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Pending
Application number
CN202011382266.9A
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Chinese (zh)
Inventor
刘煜
韩旭
李剑飞
何元清
江新平
韩晴
蒋韬
路艺
马婷婷
肖卫华
李俊
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Jiangsu Xinyang New Material Co ltd
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Jiangsu Xinyang New Material Co ltd
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Filing date
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Application filed by Jiangsu Xinyang New Material Co ltd filed Critical Jiangsu Xinyang New Material Co ltd
Priority to CN202011382266.9A priority Critical patent/CN112571830A/en
Publication of CN112571830A publication Critical patent/CN112571830A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/30Shaping 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
    • B29C70/34Shaping 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 and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/342Shaping 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 and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/54Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/001Profiled members, e.g. beams, sections

Abstract

The invention provides a U-shaped beam and a manufacturing method thereof, wherein the manufacturing method comprises the following steps: s1: blanking the prepreg to obtain a prepreg paving layer; s2: laying the prepreg layup in a mould, and carrying out at least one-time pre-curing treatment in the laying process; s3: after all the prepreg layups are laid in the mold, curing treatment is carried out; s4: and after the curing process is finished, demolding to obtain the U-shaped beam. According to the manufacturing method of the U-shaped beam, the pre-curing process is added in the process of laying the prepreg paving layers 1, the density between the adjacent prepreg paving layers 1 in the U-shaped beam is improved through the pre-curing process, the bonding strength between the adjacent prepreg paving layers 1 is improved, so that the layering and the wrinkling in the bent part of the U-shaped beam are avoided, and the mechanical property of the U-shaped beam is improved.

Description

U-shaped beam and manufacturing method thereof
Technical Field
The invention relates to the technical field of preparation of composite materials, in particular to a U-shaped beam and a manufacturing method thereof.
Background
Compared with other wedge-shaped beams, the U-shaped beam has better continuity, can bear larger centrifugal torque, and is widely applied to force bearing parts of wind tunnel compressor blades and propeller blades.
At present, RTM is mainly selected as a forming method of the U-shaped beam, and the root of the U-shaped beam prepared by the forming method, namely the bent part of the U-shaped beam, is easy to delaminate, so that the mechanical property of the U-shaped beam is influenced.
Disclosure of Invention
The invention solves the problem that the U-shaped beam made of the composite material is easy to delaminate at the bending part.
In order to solve the above problems, the present invention provides a method for manufacturing a U-shaped beam, comprising the steps of:
s1: blanking the prepreg to obtain a prepreg paving layer;
s2: laying the prepreg layup in a mould, and carrying out at least one-time pre-curing treatment in the laying process;
s3: after all the prepreg layups are laid in the mold, curing treatment is carried out;
s4: and after the curing process is finished, demolding to obtain the U-shaped beam.
Alternatively, the number of times of the pre-curing treatment in step S2 is two.
Optionally, step S2 includes:
s21: pretreating the mold;
s22: sequentially laying the prepreg laying layers in the pretreated mould, and performing pre-compaction treatment in the laying process;
s23: when the thickness of the prepreg paving layer is laid to 1/3 of the total thickness, carrying out primary pre-curing treatment;
s24: the prepreg layup was laid down to a total thickness of 2/3 for a second pre-cure treatment.
Optionally, the pre-compacting treatment during the laying process comprises: and paving a piece of peeling cloth on the prepreg paving layer paved in the mold, and then sealing and vacuumizing the mold.
Optionally, the conditions of the pre-compaction treatment are: the vacuum degree range is-0.095 MPa to-0.1 MPa, and the vacuumizing time is 10min to 15 min.
Optionally, the curing parameters of the first pre-curing treatment are as follows: the pressure is 0.5MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 80 ℃, keeping the temperature and the pressure for 5h-5.5h, cooling to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the die.
Optionally, the curing parameters of the second pre-curing treatment are as follows: the pressure is 0.7MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 80 ℃, keeping the temperature and the pressure for 5h-5.5h, cooling to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the die.
Optionally, the curing parameters of the curing process are: the pressure is 1.0MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 150 +/-5 ℃, preserving the heat for 1.5-2 h; continuously heating to 180 +/-5 ℃ at the heating rate of 1.5 ℃/min, and keeping the temperature for 3-3.5 h; and (4) reducing the temperature to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the die.
Optionally, step S1 includes:
s11: manufacturing a prepreg, and placing tracing wires in the prepreg;
s12: designing the prepreg paving layer according to the stress characteristics of the U-shaped beam to obtain the appearance of the prepreg paving layer;
s13: drawing the appearance of the prepreg paving layer through three-dimensional software;
s14: and the blanking machine performs blanking by using the prepreg and cuts the material sheet according to the appearance of the prepreg paving layer to obtain the prepreg paving layer.
Another object of the present invention is to provide a U-shaped beam obtained by the method for manufacturing a U-shaped beam as described above.
Compared with the prior art, the manufacturing method of the U-shaped beam provided by the invention has the following advantages:
according to the manufacturing method of the U-shaped beam, the pre-curing process is added in the process of laying the prepreg paving layers 1, the density between the adjacent prepreg paving layers 1 in the U-shaped beam is improved through the pre-curing process, the bonding strength between the adjacent prepreg paving layers 1 is improved, so that the layering and the wrinkling in the bent part of the U-shaped beam are avoided, and the mechanical property of the U-shaped beam is improved.
Drawings
FIG. 1 is a schematic view of the assembly of a prepreg layup and a mold according to the present invention;
FIG. 2 is a schematic diagram of a prepreg ply structure according to the present invention.
Description of reference numerals:
1-laying a prepreg; 2-a mould.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "first" and "second" are used merely for simplifying the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the first feature being "on" or "under" the first feature may comprise the first feature being in direct contact with the second feature or the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In order to solve the problem that the U-shaped beam made of the composite material is easy to delaminate at a bending part, the invention provides a manufacturing method of the U-shaped beam, which comprises the following steps:
s1: blanking the prepreg to obtain a prepreg paving layer 1;
s2: laying a prepreg laying layer 1 in a mould 2, and carrying out at least one-time pre-curing treatment in the laying process;
s3: after all prepreg paving layers 1 are laid in the mold 2, curing treatment is carried out;
s4: and (5) after the curing process is finished, demolding to obtain the U-shaped beam.
The U-shaped beam is one of main bearing parts of the whole blade, bears the pneumatic torque, the centrifugal torque, the pneumatic bending moment and the centrifugal bending moment of the blade and is required to have better mechanical property; the material of the U-shaped beam is preferably E1806/T800/35 unidirectional fabric prepreg, and both the reinforcing material and the matrix can be selected according to the use condition of the product.
The forming method of the U-shaped beam in the application is the forming of a male mold of the autoclave; specifically, according to the manufacturing method of the U-shaped beam, prepreg is blanked according to the stress characteristics and size requirements of the U-shaped beam to obtain a plurality of prepreg paving layers 1 meeting the requirements of the U-shaped beam; similarly, according to the specific requirements of the U-shaped beam, selecting a proper mold 2, as shown in fig. 1 and 2, laying the obtained prepreg laying layer 1 into the mold 2, and then placing the mold 2 on which the prepreg laying layer 1 is laid into a corresponding hot-pressing tank for curing, so as to obtain the U-shaped beam with the shape meeting the requirements.
The U-shaped beam is obtained by molding and curing the multilayer prepreg paving layer 1, so that the U-shaped part of the U-shaped beam, namely the bent part in the U-shaped beam, is easy to delaminate and wrinkle fibers in the U-shaped beam in the using process of the U-shaped beam, so that the defects are generated in the U-shaped beam, and the rigidity and the strength of the U-shaped beam are influenced.
In order to avoid the defects of delamination, wrinkles and the like in the U-shaped beam in the using process, the manufacturing method of the U-shaped beam provided by the application carries out at least one pre-curing process in the process of laying a plurality of prepreg laying layers 1 in a mould 2; after the partial prepreg paving layers 1 are paved, performing pre-curing treatment on the paved partial prepreg paving layers 1, and increasing the density among the paved prepreg paving layers 1 through the pre-curing treatment; the number of times of the pre-curing treatment is selected according to the specific size, stress and other conditions of the U-shaped beam, for example, the U-shaped beam is thick, the number of layers of the prepreg paving layers 1 forming the U-shaped beam is large, and a large number of times of pre-curing treatment processes can be set in the process of paving the prepreg paving layers 1.
According to the manufacturing method of the U-shaped beam, the pre-curing process is added in the process of laying the prepreg paving layers 1, the density between the adjacent prepreg paving layers 1 in the U-shaped beam is improved through the pre-curing process, the bonding strength between the adjacent prepreg paving layers 1 is improved, so that the layering and the wrinkling in the bent part of the U-shaped beam are avoided, and the mechanical property of the U-shaped beam is improved.
Specifically, the number of times of the pre-curing treatment in step S2 is preferably two.
When the number of times of the pre-curing treatment is two, step S2 in the present application includes:
s21: pretreating the mould 2;
s22: sequentially laying the prepreg laying layer 1 in the pretreated mould 2, and performing pre-compaction treatment in the laying process;
s23: when the thickness of the prepreg paving layer 1 is laid to 1/3 of the total thickness, carrying out primary pre-curing treatment;
s24: the second pre-cure treatment is carried out while laying down prepreg layup 1 to a total thickness of 2/3.
Carry out the preliminary treatment to mould 2 in this application specifically includes, use medical gauze to dip in acetone and clean mould 2's die cavity, dry more than 15min until the gauze does not have the heterochrosis, room temperature.
Further, in order to facilitate demolding of the U-shaped beam, the preprocessing of the mold 2 in the application further includes laying a layer of demolding cloth in the cavity of the mold 2, wherein one surface of the demolding cloth is provided with glue, so that the demolding cloth is adhered to the cavity of the mold 2 through the surface provided with the glue; in order to ensure the quality of the U-shaped beam, no air bubbles exist between the laid demoulding cloth and the cavity of the mould 2, and the demoulding cloth has no folds.
After the demolding cloth is paved, the surface of the demolding cloth is wiped for 1-2 times by using medical gauze dipped with absolute ethyl alcohol, and the demolding cloth is dried at room temperature for more than 15min, so that the pretreatment of the mold 2 is completed.
According to the requirements of the U-shaped beam, sequentially laying all prepreg laying layers 1 in a pretreated mould 2; in the application, each prepreg paving layer 1 is paved in a bilaterally symmetrical mode, namely, each prepreg paving layer 1 is symmetrically paved in a U-shaped mode; when laying each prepreg paving layer 1, fixing the U-shaped part, namely the bent part at the bottom, paving the prepreg paving layer 1 in the cavity of the mold 2 along the distribution direction of the fibers, flattening and compacting the prepreg paving layer 1 by using a roller, and avoiding the existence of bubbles and wrinkles in the U-shaped beam.
Further, in order to improve the mechanical property of the U-shaped beam and avoid the defects of layering, wrinkling and the like in the U-shaped beam, pre-compaction treatment is further performed in the laying process so as to remove air bubbles between adjacent prepreg laying layers 1 through the pre-compaction treatment.
Specifically, the pre-compaction treatment preferably performed in the laying process in the application comprises the following steps: and paving peeling cloth on the prepreg paving layer 1 paved in the mould 2, and then sealing and vacuumizing the mould 2.
In order to improve the sealing effect, the sealing treatment in the pre-compaction treatment process comprises the step of sealing the mould 2 paved with the prepreg paving layer 1 by using putty strips and a vacuum bag.
After sealing process, through evacuation processing, take out the air in 2 moulds on the one hand, avoid prepreg to spread and lay and have the bubble between 1, on the other hand makes and produces the negative pressure in 2 moulds, under the negative pressure effect, improves the bonding strength between adjacent prepreg shop's 1, avoids U type roof beam inside layering and fold to appear.
The pre-compaction treatment conditions can be determined according to the performance requirements of the U-shaped beam, and the pre-compaction treatment conditions are preferably as follows: the vacuum degree range is-0.095 MPa to-0.1 MPa, and the vacuumizing time is 10min to 15 min.
In the laying process of the prepreg laying layer 1, the number of times of pre-compaction treatment can be set according to requirements; according to the application, preferably, after the first prepreg paving layer 1 is laid, pre-compaction treatment is carried out for the first time, and then pre-compaction treatment is carried out once when two layers of prepreg paving layers 1 are laid.
In order to ensure the uniformity of the performance of the U-shaped beam, when the prepreg paving layer 1 is paved to 1/3 of the total thickness, the prepreg paving layer 1 is subjected to primary pre-curing treatment; the second pre-cure treatment is carried out while laying down prepreg layup 1 to a total thickness of 2/3.
The curing parameters of the first pre-curing treatment and the second pre-curing treatment can be determined according to the mechanical requirements of the U-shaped beam and the number of layers of the prepreg paving layer, and the curing parameters of the first pre-curing treatment and the curing parameters of the second pre-curing treatment can be the same or different.
Specifically, the curing parameters of the first pre-curing treatment are preferably as follows: the pressure is 0.5MPa, and the heating rate is 1.5 ℃/min; when the temperature of the mould 2 is raised to 80 ℃, keeping the temperature and the pressure for 5h-5.5h, cooling to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the mould 2 to finish the first pre-curing treatment.
Further, the curing parameters of the second pre-curing treatment are preferably as follows: the pressure is 0.7MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 80 ℃, keeping the temperature and the pressure for 5h-5.5h, cooling to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the mold 2 to finish the second pre-curing treatment.
The application provides a manufacturing approach of U type roof beam, it lays the in-process to shop's prepreg layer 1 preferably, carry out twice precuring and handle, and in carrying out twice precuring and handling, increase along with the number of piles of prepreg layer 1, the pressure that carries out precuring and handle increases in proper order, thereby through the regulation to pressure, make the bonding strength between adjacent prepreg layer 1 of laying in whole U type roof beam tend to unanimity, and then when improving the joint strength between adjacent prepreg layer 1 of laying, still can guarantee that the power that each prepreg layer 1's both sides received in the inside of U type roof beam tend to equilibrium, thereby be favorable to improving fibrous straightness in the U type roof beam, effectively reduce the fibrous fold at U type roof beam root, avoid the inside layering that appears of U type roof beam, reduce U type roof beam internal defect, improve the rigidity and the intensity of U type roof beam.
Further, after all the prepreg paving layers 1 are laid, curing treatment is further carried out to obtain a U-shaped beam; specifically, the curing parameters of the preferred curing treatment in the present application are: the pressure is 1.0MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 150 +/-5 ℃, preserving the heat for 1.5-2 h; continuously heating to 180 +/-5 ℃ at the heating rate of 1.5 ℃/min, and keeping the temperature for 3-3.5 h; and (3) reducing the temperature to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank, taking out the die 2, and demolding to obtain the U-shaped beam.
The application provides a manufacturing approach of U type roof beam, lay 1 shop in-process to the preimpregnation material and carry out two pre-curing treatments, and lay 1 shop in the preimpregnation material and accomplish the back, carry out curing treatment, in twice pre-curing treatment and the curing treatment process, curing pressure increases along with spreading the increase of the layer number, through the optimization to cubic curing pressure, improve the inside adjacent preimpregnation material of U type roof beam of manufacturing and spread density and cohesion between 1, make inside each preimpregnation material of U type roof beam and spread 1 both sides atress and tend towards equilibrium simultaneously, thereby avoid the bending part of U type roof beam to appear fold and layering, reduce the inside defect of U type roof beam.
In addition, the prepreg layup 1 in the present application may be prepared by any method in the prior art; specifically, in the present application, step S1 preferably includes:
s11: manufacturing a prepreg, and placing tracing wires in the prepreg;
s12: designing the prepreg paving layer 1 according to the stress characteristics of the U-shaped beam to obtain the appearance of the prepreg paving layer 1;
s13: drawing the appearance of the prepreg paving layer 1 through three-dimensional software;
s14: and the blanking machine performs blanking by using the prepreg, and cuts the material sheet according to the appearance of the prepreg paving layer 1 to obtain the prepreg paving layer 1.
This application is for being convenient for detect the ride comfort that prepreg spread layer 1 in the U type roof beam of making, and then the ride comfort that spreads layer 1 according to prepreg detects the inside defect of U type roof beam, to prepreg preparation in-process, places the tracer wire to detect through the tracer wire in the later stage, judge the prepreg according to the ride comfort of tracer wire and spread layer 1, and then realize carrying out the purpose that detects to the inside defect of U type roof beam.
Before blanking, firstly, designing the structure, shape and the like of each prepreg paving layer 1 according to the specific stress characteristics of the U-shaped beam to obtain the specific appearance of each prepreg paving layer 1; in the application, the appearance of each prepreg paving layer 1 comprises information such as the length, the width, the thickness and the like of each position of the prepreg paving layer 1; drawing each prepreg paving layer 1 through corresponding three-dimensional software, introducing each drawn prepreg paving layer 1 into an operating system of an automatic blanking machine, simultaneously placing the prepreg prepared in the step S11 on a bracket of the blanking machine, so that the blanking machine carries out blanking by using the prepreg, and cutting the material sheet according to the shape of the prepreg paving layer 1 to obtain the corresponding prepreg paving layer 1; the plastic bag is used for packaging each prepreg paving layer 1, and according to the paving sequence, the paving information of each prepreg paving layer 1 is marked, so that the paving of each prepreg paving layer 1 can be conveniently and sequentially paved in the later period.
According to the stress characteristic of the U-shaped beam, the thickness of the blade root to the blade tip of the U-shaped beam is preferably reduced in sequence, and therefore the appearance and the structure of each prepreg paving layer 1 are designed according to the structural characteristic of the U-shaped beam.
Another object of the present invention is to provide a U-shaped beam obtained by the method for manufacturing a U-shaped beam as described above.
According to the U-shaped beam, in the manufacturing process, the pre-curing process is added, the density between adjacent prepreg paving layers 1 in the U-shaped beam is improved by the pre-curing process, and the bonding strength between the adjacent prepreg paving layers 1 is improved, so that the U-shaped beam is prevented from layering and wrinkling in the bent part, and the mechanical property of the U-shaped beam is improved.
This application is through the optimization to cubic curing pressure, improves density and cohesion between the inside adjacent preimpregnation material of U type roof beam of making and spreads the layer 1 both sides atress of putting simultaneously for each preimpregnation material of U type roof beam inside and tends to the equilibrium to fold and layering appear in the bending part of avoiding U type roof beam, reduce the inside defect of U type roof beam.
Concretely, for detecting the inner structure of the U type roof beam that this application provided, utilize the tracer wire of placing, carry out nondestructive test to the structure of U type roof beam inside through X ray, the testing result shows, the U type roof beam that this application provided, inside keeps the fibre smooth-going, no fold, no layering, thereby the U type roof beam of manufacturing method through the U type roof beam that this application provided has been proven, each preimpregnation material is spread layer 1 and can be followed U type roof beam curved surface appearance and change, can avoid inside layering and fold defect to appear, thereby be favorable to improving the mechanical properties of U type roof beam.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims (10)

1. A manufacturing method of a U-shaped beam is characterized by comprising the following steps:
s1: blanking the prepreg to obtain a prepreg paving layer (1);
s2: laying the prepreg laying layer (1) in a mould (2), and carrying out at least one-time pre-curing treatment in the laying process;
s3: after all the prepreg layups (1) are laid in the mould (2), curing treatment is carried out;
s4: and after the curing process is finished, demolding to obtain the U-shaped beam.
2. A method of manufacturing a U-beam according to claim 1, wherein the number of the pre-curing process in the step S2 is two.
3. The method for manufacturing a U-beam according to claim 2, wherein the step S2 includes:
s21: -pre-treating the mould (2);
s22: sequentially laying the prepreg layup (1) in the pretreated mould (2), and performing pre-compaction treatment in the laying process;
s23: when the thickness of the prepreg paving layer (1) is laid to 1/3 of the total thickness, carrying out primary pre-curing treatment;
s24: a second pre-cure treatment is carried out while laying down the prepreg layup (1) to a thickness of 2/3 of total thickness.
4. A method of manufacturing a U-beam according to claim 3 wherein the pre-compacting treatment during the laying process comprises: and paving peeling cloth on the prepreg paving layer (1) paved in the mould (2), and then sealing and vacuumizing the mould (2).
5. A method of manufacturing a U-beam according to claim 4, wherein the pre-compaction treatment is performed under the conditions: the vacuum degree range is-0.095 MPa to-0.1 MPa, and the vacuumizing time is 10min to 15 min.
6. A method of manufacturing a U-beam according to claim 3 wherein the curing parameters of the first pre-curing process are: the pressure is 0.5MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 80 ℃, keeping the temperature and the pressure for 5h-5.5h, cooling to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the mold (2).
7. A method of manufacturing a U-beam according to claim 3 wherein the curing parameters of the second pre-curing process are: the pressure is 0.7MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 80 ℃, keeping the temperature and the pressure for 5h-5.5h, cooling to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the mold (2).
8. A method of manufacturing a U-beam according to any of claims 1 to 7 wherein the curing process has curing parameters of: the pressure is 1.0MPa, and the heating rate is 1.5 ℃/min; when the temperature is raised to 150 +/-5 ℃, preserving the heat for 1.5-2 h; continuously heating to 180 +/-5 ℃ at the heating rate of 1.5 ℃/min, and keeping the temperature for 3-3.5 h; and (3) reducing the temperature to below 45 ℃ at the cooling rate of 2 ℃/min, opening the tank and taking out the die (2).
9. A method for manufacturing a U-shaped beam according to any one of claims 1 to 7, wherein the step S1 includes:
s11: manufacturing a prepreg, and placing tracing wires in the prepreg;
s12: designing the prepreg paving layer (1) according to the stress characteristic of the U-shaped beam to obtain the appearance of the prepreg paving layer (1);
s13: drawing the appearance of the prepreg paving layer (1) through three-dimensional software;
s14: and the blanking machine carries out blanking by using the prepreg and cuts the material sheet according to the appearance of the prepreg paving layer (1) to obtain the prepreg paving layer (1).
10. A U-shaped beam, characterized in that the U-shaped beam is obtained by the method for manufacturing a U-shaped beam according to any one of claims 1 to 9.
CN202011382266.9A 2020-11-30 2020-11-30 U-shaped beam and manufacturing method thereof Pending CN112571830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011382266.9A CN112571830A (en) 2020-11-30 2020-11-30 U-shaped beam and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011382266.9A CN112571830A (en) 2020-11-30 2020-11-30 U-shaped beam and manufacturing method thereof

Publications (1)

Publication Number Publication Date
CN112571830A true CN112571830A (en) 2021-03-30

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