CN115256995A - Microwave curing forming method for automobile carbon fiber rearview mirror shell and product thereof - Google Patents
Microwave curing forming method for automobile carbon fiber rearview mirror shell and product thereof Download PDFInfo
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- CN115256995A CN115256995A CN202210895735.XA CN202210895735A CN115256995A CN 115256995 A CN115256995 A CN 115256995A CN 202210895735 A CN202210895735 A CN 202210895735A CN 115256995 A CN115256995 A CN 115256995A
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Classifications
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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
- 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
- B29C70/34—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 and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—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 and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- 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
-
- 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
- B29C2035/0855—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 microwave
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Reinforced Plastic Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a microwave curing molding method of a carbon fiber rearview mirror shell for an automobile and a product thereof, belonging to the technical field of composite material curing. Packaging the carbon fiber prepreg spread on the mold by using a vacuum bag, and tightly wrapping the mold by using a wave-transmitting heat-insulating material; the mold is controlled to do reciprocating linear motion in the microwave cavity, and the microwave output power is increased in a step-type mode within 600-1200W, so that the carbon fiber composite material automobile rearview mirror is uniformly heated and cured in a microwave field. The method has the advantages of simple and reliable process and low energy consumption, and the obtained carbon fiber rearview mirror shell for the automobile has smooth and flat surface and stable shape, and provides technical support for industrial application of the composite material microwave curing technology.
Description
Technical Field
The invention belongs to the technical field of composite material curing, and particularly relates to a microwave curing forming method of an automobile carbon fiber rearview mirror shell and a product thereof.
Background
The material composed of the carbon fiber reinforced material and the resin matrix is called carbon fiber resin composite material or carbon fiber reinforced plastic. The carbon fiber has high elastic modulus, strong tensile strength and good high-temperature performance. Thus, when the carbon fibers are combined with some resin matrix to form a composite, the composite exceeds virgin glass fiber reinforced plastic in many properties while maintaining many of the advantages of glass fiber reinforced plastic. The carbon fiber-epoxy resin composite material has strength and elastic modulus exceeding those of aluminum alloy, even approaching those of high-strength steel, and has small specific gravity, so that the carbon fiber-epoxy resin composite material becomes one of the composite materials with the highest specific strength and specific modulus. The carbon fiber reinforced plastic has small strength loss in a high-temperature aging test, and has remarkable advantages in the aspects of impact resistance, fatigue resistance, antifriction and wear resistance, self-lubrication, corrosion resistance, heat resistance and the like.
At present, the autoclave curing process is widely used for curing carbon fiber composite materials, the thermosetting forming method has the problems of low heat transfer speed, large temperature gradient, uneven curing, low curing speed and the like, and most importantly, the process has the defects of high energy consumption and long flow path and is not beneficial to wide industrial application. However, microwave heating is different from conventional heating in that electromagnetic waves penetrate through a composite material to perform overall heating from the inside of a substance. The technology has the advantages of rapid heating, selective heating, small thermal inertia, energy conservation, consumption reduction and the like. The application of the microwave heating technology to the curing of the carbon fiber composite material has great potential, and researchers at home and abroad also carry out a great deal of research on the microwave heating curing of the carbon fiber composite material and obtain a plurality of research results.
For example, patent CN104149365 provides a microwave curing method for carbon fiber composite material shafts, and although the study on the special-shaped structure is carried out, the process proposed in the patent application does not relate to the translation in a microwave cavity. CN201610675566.3 provides a microwave curing method for carbon fiber laminate, which is not a special-shaped structure and the energy loss is serious.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a microwave curing molding method of a carbon fiber rearview mirror shell for an automobile and a product thereof. The curing process period can save about 34% of energy compared with the conventional curing process while ensuring the complete curing of the product.
In order to achieve the purpose, the invention provides the following technical scheme:
a microwave curing forming method for an automobile carbon fiber rearview mirror shell comprises the following steps:
carbon fiber prepreg, demolding cloth, an isolation film and an air felt are sequentially laid on a mold, the mold is packaged by a vacuum bag, then a wave-transmitting heat insulation material is wrapped on the outer layer of the vacuum bag, reciprocating linear motion is carried out in a microwave cavity by controlling the mold under the condition of keeping vacuum, microwave curing molding is carried out by adopting stepped increasing output power, the carbon fiber rearview mirror shell for the automobile is uniformly heated and cured in a microwave field, and the carbon fiber rearview mirror shell for the automobile is obtained.
Further, the mold release agent needs to be applied three times to the inner surface of the mold before the material is laid in the mold.
Further, the material of the mould is polytetrafluoroethylene, quartz or corundum.
Further, the carbon fiber prepreg is T300 carbon fiber/epoxy resin.
Furthermore, the wave-transmitting heat-insulating material is asbestos cloth. The heat loss in the heating curing molding process is reduced.
Further, the vacuum degree in the vacuum environment is between 100 and 200mbar.
Furthermore, the microwave curing instrument is self-made and modified in a laboratory of Kunming university of technology, a support capable of reciprocating is arranged in the microwave curing instrument, and 6 microwave input ports are controlled by 6 magnetrons.
Further, the movement speed of the reciprocating linear motion is 0.01m/s, and the movement distance is within the range of 200 mm. In the process of reciprocating linear motion, the positive motion direction is set to move from the oven door to the inside; the reciprocating mode is fixed to firstly carry out forward motion and then switched to reverse motion, and the reciprocating mode is stopped for 1s when the forward motion and the reverse motion are switched each time.
Further, in the microwave curing molding, the microwave output power is 600-1200W, and the microwave irradiation time is 100-300min.
Furthermore, the outer layer of the vacuum bag is also provided with 6 temperature measurement optical fiber probes, the 6 temperature measurement optical fiber probes are correspondingly connected, and the other end of the temperature measurement optical fiber is led out of the microwave cavity. A layer of vacuum bag is needed to be laid between the temperature measuring optical fiber probe stuck on the surface of the vacuum bag and the wave-transmitting heat-insulating material to prevent the optical fiber probe from being polluted.
The invention also provides the carbon fiber rearview mirror shell for the automobile, which is prepared by the method.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention cures and forms the carbon fiber with complex shape (simultaneously comprising curved surface and plane) in the microwave field, and compared with other microwave curing laminated plates, the invention realizes breakthrough on curing more complex structure. The uniformity of temperature distribution in each area in the microwave heating process of the carbon fiber prepreg is improved in a horizontal movement mode, the design of a microwave transmission system can be simplified by adopting the process, the operation difficulty is effectively reduced, and the reliability of microwave curing process parameters is favorably ensured;
2. by wrapping the vacuum bag and the mold with the wave-transparent heat-insulating material, the heat loss caused by the heat dissipation of the mold and the carbon fibers to the surrounding environment in the microwave heating process is reduced, and the utilization rate of microwave energy is effectively improved;
3. through the accurate regulation and control of the microwave output power and the material motion trail, the temperature difference between each area of the laminated plate in the process of heating the carbon fiber composite material by microwave is effectively controlled within 25 ℃, and the flatness and the curing degree of the carbon fiber composite material automobile rearview mirror are ensured;
4. compared with the conventional cured product, the finished product prepared by the invention is the automobile rearview mirror with the real size of 1;
5. the method has simple and reliable process, and the obtained carbon fiber rearview mirror shell for the automobile has smooth and flat surface and stable shape, and provides technical support for industrial application of the composite material microwave curing technology.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a microwave curing apparatus according to the present invention; wherein, (1), (2), (3), (4), (5) and (6) are microwave input ports controlled by a magnetron;
FIG. 2 is a view showing the arrangement positions of the molds according to the present invention; wherein, 1 is a bracket, and 2 is a mould;
FIG. 3 is a schematic view of microwave curing and packaging method for preparing a carbon fiber rearview mirror housing for an automobile in example 1; wherein, 1 is a mould; 2 is carbon fiber prepreg; 3 is demoulding cloth; 4 is an isolation film; 5 is a ventilated felt; 6 is heat preservation cotton; 7 is a temperature measuring optical fiber probe; 8 is a vacuum bag; 9 is a vacuum tube;
FIG. 4 is a schematic view of the arrangement of temperature measuring optical fibers in the carbon fiber rearview mirror housing for an automobile prepared in example 1;
fig. 5 is a temperature rise curve and a microwave power change chart of the carbon fiber mirror housing for an automobile prepared in example 1.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in that stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
A microwave curing forming method for an automobile carbon fiber rearview mirror shell comprises the following steps:
carbon fiber prepreg, demolding cloth, an isolation film and an air felt are sequentially laid on a mold, the mold is packaged by a vacuum bag, then a wave-transmitting heat insulation material is wrapped on the outer layer of the vacuum bag, reciprocating linear motion is carried out in a microwave cavity by controlling the mold under the condition of keeping vacuum, microwave curing molding is carried out by adopting stepped increasing output power, the carbon fiber rearview mirror shell for the automobile is uniformly heated and cured in a microwave field, and the carbon fiber rearview mirror shell for the automobile is obtained.
In some preferred embodiments, the material of the mold is polytetrafluoroethylene, quartz or corundum. Most preferably, the polytetrafluoroethylene has no microwave absorbing effect on the microwaves. Three passes of a release agent are required on the inner surface of the mold prior to the material being laid in the mold.
In some preferred embodiments, the carbon fiber prepreg is T300 carbon fiber/epoxy.
In some preferred embodiments, the wave-transparent and thermally insulating material is asbestos cloth. The heat loss in the heating curing molding process is reduced.
The embodiment of the invention has no special requirements on the sources and the materials of the demoulding cloth, the isolating film and the breathable felt, and the adopted demoulding cloth, the isolating film and the breathable felt are provided by Tianjin El Taike composite material Co.
In some preferred embodiments, the carbon fibre prepreg is 0.1mm thick, more preferably, the lay-up thickness is in the range of 1 to 3, most preferably 2.
In some preferred embodiments, the vacuum level in the vacuum environment is 100-200mbar. More preferably 150mbar.
In some preferred embodiments, the movement rate of the reciprocating linear motion is 0.01m/s, and the movement distance is within the range of 200 mm. In the reciprocating linear motion process, the positive motion direction is set to move from the oven door to the inside; the reciprocating mode is fixed to firstly carry out forward motion and then switched to reverse motion, and the reciprocating mode is stopped for 1s when the forward motion and the reverse motion are switched each time.
In some preferred embodiments, in the microwave curing molding, the microwave output power is 600-1200W, and the microwave irradiation time is 100-300min.
In some preferred embodiments, the outer layer of the vacuum bag is further provided with a temperature measuring optical fiber probe, and the total number of the temperature measuring optical fiber probes is 6, the temperature measuring optical fiber probes are correspondingly connected with 6 temperature measuring optical fibers, and the other end of each temperature measuring optical fiber is led out of the microwave cavity. A layer of vacuum bag is needed to be laid between the temperature measuring optical fiber probe stuck on the surface of the vacuum bag and the wave-transmitting heat-insulating material to prevent the optical fiber probe from being polluted.
The invention also provides the automobile carbon fiber rearview mirror shell prepared by the method.
The microwave device adopted by the invention is a horizontal microwave oven, the microwave cavity is cylindrical, the inner diameter is 1600mm, the length of the cylindrical cavity is 2000mm, the two ends of the cavity are arc surfaces with the depth of 400mm, and the total length of the whole cavity is 2800mm. The distance between the support at the mold placing position and the bottom of the cylindrical cavity is 400mm, and the initial position of the mold in reciprocating linear motion can be randomly arranged within the range of 80-600mm from the furnace door. In the invention, microwaves are emitted from the magnetrons on the left side and the right side of the cylindrical cavity and are directly transmitted into the microwave cavity through the waveguide.
The invention provides a microwave curing and heating method for a special-shaped carbon fiber composite automobile rearview mirror, wherein the shape of an automobile rearview mirror shell is complex, the automobile rearview mirror shell has a plane and a curved surface, and microwaves are refracted in a mould in various ways. The invention is described in further detail below with reference to the figures and specific examples.
Example 1
FIG. 1 is a schematic view of a microwave curing apparatus according to the present invention; wherein, (1), (2), (3), (4), (5) and (6) are microwave input ports controlled by a magnetron.
FIG. 2 is a view showing the arrangement positions of the molds according to the present invention; wherein, 1 is a bracket, and 2 is a mould.
Fig. 3 is a schematic view of a microwave curing and packaging method for preparing a carbon fiber rearview mirror shell for an automobile.
The mold used in this example was a teflon mold.
1) As shown in fig. 1, a mold release agent is coated on the surface of a mold 1 for three times, then 2 layers of unidirectional T300 carbon fiber/epoxy resin prepreg 2 are used for carrying out equidirectional laying on the mold 1, then a mold release cloth 3, an isolation film 4 (polyolefin nonporous isolation film) and an air felt 5 are laid in sequence, the mold 1 is packaged by a vacuum bag 8, one end of a vacuum tube 9 is sealed in the bag by a sealing adhesive tape, and after the packaging and packaging are finished, a layer of heat insulation cotton 6 is laid on the surface of the vacuum bag;
2) 6 temperature measuring optical fiber probes 7 are stuck on the outer surface of the vacuum bag 8, 6 temperature measuring optical fiber probes are correspondingly connected with 6 temperature measuring optical fibers, the other end of each temperature measuring optical fiber is led out of the microwave cavity through an instrument, and the placing positions are shown in figure 2: 1. the No. 2 temperature measurement optical fiber probe is positioned at the bottom layer of the mold 1 after the layer is laid, and the No. 3, 4, 5 and 6 temperature measurement optical fiber probes are respectively placed on four side surfaces of the laid mold and used for monitoring the temperature change condition of the fiber tip area; the vacuum bag 8 is adopted to carry out secondary packaging on the outer layer of the vacuum bag 8 stuck with the temperature-measuring optical fiber probe 7, so that the optical fiber probe is prevented from being polluted; the vacuum bag is sealed by a sealing adhesive tape and is vacuumized by a vacuum tube (the vacuum degree is 150 mbar);
3) Pack the asbestos cloth in 8 outer parcels of vacuum bag of evacuation, then with the good mould installation of preliminary treatment in the lower floor support of microwave intracavity apart from center right side 200mm department, begin the microwave solidification flow, specifically do:
s1, microwave equipment is a horizontal microwave oven, a microwave cavity is cylindrical, the inner diameter of the microwave cavity is 1600mm, the length of the cylindrical cavity is 2000mm, two ends of the cavity are arc surfaces with the depth of 400mm, and the total length of the whole cavity is 2800mm. The distance between the bracket provided with the die and the bottom of the cylindrical cavity is 400mm;
s2, adjusting the mold to a position 500mm close to a furnace door, closing the furnace door, simultaneously opening 1-6 magnetrons, setting the output power of each magnetron to be 100W, opening the reciprocating linear motion of the mold after microwave output is started for 2S, wherein the motion speed is 0.01m/S, and the motion distance is 200mm; after the microwave irradiation is carried out for 23min, the output power of 6 magnetrons is adjusted to 150W, the total output power of the microwaves is 900W, the heat preservation is started after the microwave irradiation is carried out for 29min (when the total power is 900W), and the temperature rise curves of 6 temperature measuring points are shown in figure 3. It can be seen that the maximum temperature difference occurring in the whole temperature rise process is the temperature of 120 ℃ at the maximum, and the temperature difference between the maximum point and the minimum point is 22.8 ℃ (the heat preservation of the invention is intermittent heating, specifically, the heat preservation is continuously carried out under the temperature, the temperature is always kept in a corresponding range by regulating and controlling a power switch, and the power output is immediately closed when the temperature exceeds the range).
And S3, starting timing and heat preservation for 90min when the highest point temperature reaches 120 ℃, intermittently outputting microwave power (900 w) during the heat preservation period to maintain the temperature of each point of the plywood in the mold, and enabling the temperature of each point to fluctuate within a five-degree range by taking the temperature at the beginning of heat preservation as a reference during the heat preservation period and maintaining the continuous operation of the reciprocating support. And closing microwave irradiation and opening a furnace door after heat preservation is finished, taking down asbestos cloth to allow the mold to be naturally cooled and stop vacuumizing, taking down the temperature measuring optical fiber probe when the temperature is reduced to fifty ℃, and disassembling a vacuum bag to obtain the carbon fiber/epoxy resin automobile rearview mirror model (the automobile carbon fiber rearview mirror shell).
And respectively taking a sample from the bottom and the side surface of the prepared carbon fiber/epoxy resin automobile rearview mirror model for thermogravimetric measurement, and finding that the prepared automobile rearview mirror is completely cured.
Example 2
The mold used in this example was a quartz mold.
Step 1) and step 2) are the same as those in example 1, except that the microwave curing process in step 3) specifically includes:
s1, microwave equipment is a horizontal microwave oven, a microwave cavity is cylindrical, the inner diameter of the microwave cavity is 1600mm, the length of the cylindrical cavity is 2000mm, two ends of the cavity are arc surfaces with the depth of 400mm, and the total length of the whole cavity is 2800mm. The distance between the bracket provided with the die and the bottom of the cylindrical cavity is 400mm;
s2, adjusting the mold to a position 500mm close to a furnace door, closing the furnace door, simultaneously opening 1-6 magnetrons, setting the output power of each magnetron to be 100W, opening the reciprocating linear motion of the mold after microwave output is started for 2S, wherein the motion speed is 0.01m/S, and the motion distance is 200mm; after the microwave irradiation is carried out for 30min, the output power of 6 magnetrons is adjusted to 150W, the output of the 6 magnetrons is adjusted to 200W after the microwave irradiation lasts for 28min under the power of 150W, the microwave irradiation is finished after the microwave irradiation lasts for 13min under the power of 200W, the microwave irradiation is closed and the oven door is opened after the microwave irradiation is finished, the asbestos cloth is taken down, the mold is naturally cooled, the vacuumizing is stopped, the temperature measuring optical fiber probe is taken down when the temperature is reduced to fifty ℃, and the vacuum bag is disassembled, so that the carbon fiber/epoxy resin automobile rearview mirror model (the automobile carbon fiber rearview mirror shell) is prepared. The maximum temperature difference occurring during the whole temperature rise process is 24.6 ℃.
Example 3
The difference from example 1 is that the mold used in this example is a corundum mold. Through detection, the carbon fiber/epoxy resin automobile rearview mirror model prepared by the embodiment is completely cured, and the surface is smooth and has no warpage.
Example 4
The difference from example 1 is that in step 3) S1, the mold is placed in the center of the lower holder. The maximum temperature difference occurring throughout the entire temperature rise of this example was found to be 17.0 ℃.
Comparative example 1
1) Only differs from example 1 in that 5 layers of unidirectional T300 carbon fibre/epoxy prepreg were used;
2) Same as example 1, step 2);
3) The difference from the embodiment 1 is only that in S2, the mould is adjusted to be 1000mm close to the oven door, the No. 2, 3, 4 and 6 magnetrons are simultaneously opened after the oven door is closed, the output power of each magnetron is set to be 150W, the reciprocating linear motion of the mould is opened after the microwave output is started for 2S, the motion speed is 0.01m/S, and the motion distance is within the range of 200mm; and starting heat preservation after microwave irradiation for 47 min. The maximum temperature difference occurring in the whole temperature rising process is 67 ℃ through detection. The obtained automobile rearview mirror is not completely cured.
Comparative example 2
1) Same as example 1, step 1);
2) Only differs from example 1 in that, in step 2), no evacuation is carried out;
3) The only difference from example 1 is that in step 3), the asbestos cloth is not wrapped.
The maximum temperature difference in the whole temperature rise process is 72 ℃ through detection. The obtained automobile rearview mirror is not completely cured.
Test example 1
Curing by a conventional curing method, conventionally heating by using an electrothermal blowing drying oven, controlling the total power to be 2230W, and keeping the temperature for 140min under the total power to obtain a completely cured product.
The energy consumption ratio of the process to the curing process of example 1 is shown in table 1.
TABLE 1
As can be seen from Table 1, the energy consumption for the curing process of the examples of the present invention is 34% less than that for the conventional curing process (the power output time is short because the present invention is batch heating, while the power output time is continuous and the output time is longer in the conventional curing process).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A microwave curing forming method for an automobile carbon fiber rearview mirror shell is characterized by comprising the following steps:
carbon fiber prepreg, demolding cloth, an isolation film and an air felt are sequentially laid on a mold, the mold is packaged by a vacuum bag, then a wave-transmitting heat insulation material is wrapped on the outer layer of the vacuum bag, reciprocating linear motion is carried out in a microwave cavity by controlling the mold under the condition of keeping vacuum, microwave curing molding is carried out by adopting stepped increasing output power, the carbon fiber rearview mirror shell for the automobile is uniformly heated and cured in a microwave field, and the carbon fiber rearview mirror shell for the automobile is obtained.
2. The microwave curing molding method of the carbon fiber rearview mirror housing for the automobile according to claim 1, wherein the material of the mold is polytetrafluoroethylene, quartz or corundum.
3. The microwave curing molding method of the carbon fiber rearview mirror housing for the automobile according to claim 1, wherein the carbon fiber prepreg is T300 carbon fiber/epoxy resin.
4. The microwave curing molding method of the carbon fiber rearview mirror housing for the automobile as claimed in claim 1, wherein the wave-transmitting and heat-insulating material is asbestos cloth.
5. The microwave curing molding method of the carbon fiber rearview mirror housing for the automobile as claimed in claim 1, wherein the degree of vacuum in the vacuum environment is 100-200mbar.
6. The microwave curing molding method of the carbon fiber rearview mirror housing for the automobile as claimed in claim 1, wherein the movement rate of the reciprocating linear motion is 0.01m/s, and the movement distance is within 200 mm.
7. The microwave curing molding method of the carbon fiber rearview mirror housing for the automobile as claimed in claim 1, wherein in the microwave curing molding, the microwave output power is 600-1200W, and the microwave irradiation time is 100-300min.
8. The microwave curing and forming method for the carbon fiber rearview mirror housing for the automobile as claimed in claim 1, wherein a temperature measuring optical fiber probe is further disposed on an outer layer of the vacuum bag.
9. The carbon fiber rearview mirror shell for the automobile, prepared by the microwave curing and forming method of the carbon fiber rearview mirror shell for the automobile as claimed in any one of claims 1-8.
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