CN114193677A - Rapid curing device, curing system and curing method for composite honeycomb - Google Patents
Rapid curing device, curing system and curing method for composite honeycomb Download PDFInfo
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- CN114193677A CN114193677A CN202111444003.0A CN202111444003A CN114193677A CN 114193677 A CN114193677 A CN 114193677A CN 202111444003 A CN202111444003 A CN 202111444003A CN 114193677 A CN114193677 A CN 114193677A
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- 238000001723 curing Methods 0.000 title description 156
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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
-
- 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
- B29C35/002—Component parts, details or accessories; Auxiliary operations
-
- 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
- B29C35/007—Tempering units for temperature control of moulds or cores, e.g. comprising heat exchangers, controlled valves, temperature-controlled circuits for fluids
-
- 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
- B29C35/16—Cooling
-
- 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
- B29C2035/0211—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould resistance heating
-
- 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
- B29C35/16—Cooling
- B29C2035/1658—Cooling using gas
-
- 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
- B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
- B29L2031/608—Honeycomb structures
Abstract
The invention discloses a quick curing device for a composite material honeycomb, which comprises a supporting block, a heating rod and a cylindrical curing core with a hole in the center, wherein the center of the supporting block is provided with a through hole; the bottom end of the heating rod is inserted into the central hole of the supporting block; the curing core is sleeved outside the heating part of the heating rod, and the bottom surface of the curing core is in contact with the top surface of the supporting block; the solidified core has a thermal expansion coefficient of 15 x 10‑6/℃～25×10‑6/° C and the heat-resistant temperature is more than or equal to 100 ℃; the shape of the outer side surface of the cured core is matched with the shape of the inner side surface of the honeycomb in the composite material honeycomb. The invention also discloses a system and a method for quickly curing the composite material honeycomb. The invention can continuously, rapidly and efficiently produce the composite material honeycomb with stable quality.
Description
Technical Field
The invention relates to a rapid curing system and method for a honeycomb core, in particular to a rapid curing device, a curing system and a curing method for a composite material honeycomb.
Background
At present, composite material honeycombs, which are the main type of lightweight honeycomb materials, have been widely used in various fields such as aerospace, vehicles, ships, construction, and mechanical engineering due to their reliable mechanical properties and excellent disposability. The use of fiber reinforced composites is an effective method to develop ultra-light honeycomb materials with excellent mechanical properties. Fiber-reinforced composites have various advantages, such as high specific stiffness and strength, excellent fatigue properties, corrosion resistance and high temperature resistance. Thus, the use of fiber reinforced cellular materials in core sandwich applications has unlimited potential in hypersonic aircraft, remote rockets, cargo ships and protection systems.
During the manufacture of fiber reinforced composite honeycombs, the mechanical properties, failure mechanisms, and structural defects of honeycombs made by different manufacturing methods are different. Common manufacturing methods include thermoforming, mechanical interlocking structures, custom origami methods, 3D printing, and the like. The hot press molding is a manufacturing method which is most widely applied, and the preparation of the fiber reinforced composite material honeycomb is completed by pressurizing and thermosetting the prepreg mainly by using a specially-arranged mold, but the continuous manufacturing of the composite material honeycomb cannot be realized by the conventional method. The mechanical interlocking method is mainly used for completing the assembly of the composite material honeycomb in a mechanical interlocking mode, but the method has poor performance at the rib intersection due to the interference of fibers. For the customized origami method, the low fault tolerance is a difficult point in the preparation process. In the 3D printing process, the nozzle is easy to block, the mechanical property of the honeycomb is poor, and obvious anisotropy exists in the longitudinal and transverse printing directions.
Disclosure of Invention
The invention provides a device, a system and a method for quickly curing a composite material honeycomb, which are used for solving the technical problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a kind ofThe rapid curing device for the composite material honeycomb comprises a supporting block, a heating rod and a cylindrical curing core with a hole in the center, wherein the center of the supporting block is provided with a through hole; the bottom end of the heating rod is inserted into the central hole of the supporting block; the curing core is sleeved outside the heating part of the heating rod, and the bottom surface of the curing core is in contact with the top surface of the supporting block; the solidified core has a thermal expansion coefficient of 15 x 10-6/℃～25×10-6/° C and the heat-resistant temperature is more than or equal to 100 ℃; the shape of the outer side surface of the cured core is matched with the shape of the inner side surface of the honeycomb in the composite material honeycomb.
Further, the device also comprises a curing device bottom plate used for positioning the curing core; the upper surface of the curing device bottom plate is provided with a groove matched with the lower end of the supporting block; the supporting block is inserted into the groove; a through hole is formed in the center of the groove; the power line of the heating rod is led out from the through hole in the groove.
The upper surface of the curing core is provided with a radial groove or a radial bulge, and the lower surface of the limiting head is correspondingly provided with a radial bulge or a radial groove matched with the upper surface of the curing core; the limiting head is fixedly connected with the heating rod.
Further, the heating rod comprises a heating upright post with a spiral groove on the outer surface and an electric heating wire wound along the spiral groove; the electric heating wire does not protrude out of the outer surface of the heating upright post; the outer surface of the heating upright post is insulated and made of a material with the heat conductivity coefficient less than or equal to 2.00W/m.K.
The invention also provides a rapid curing system of the composite material honeycomb, which comprises the rapid curing device of the composite material honeycomb.
Further, the device also comprises a control system, a temperature detection device, a lifting device and a positioning device; the positioning device is used for positioning the honeycomb position in the composite material honeycomb and comprises a positioning disc, and positioning holes in clearance fit with the curing cores are formed in the position, corresponding to the honeycomb, of the positioning disc; the lifting device is used for lifting the rapid curing device to enable the curing core to be upwards inserted into or downwards withdrawn from the honeycomb in the composite material honeycomb; the temperature detection device is used for detecting the temperature of the curing core and sending a detection signal to the control system; the control system is used for receiving the detection signal of the temperature detection device and controlling the heating rod and the lifting device to work.
Furthermore, the positioning holes formed in the positions, corresponding to the honeycomb, of the positioning devices are hexagonal holes.
Further, the device also comprises a feeding device; the feeding device is used for placing the composite material honeycomb on the positioning device; the honeycomb-shaped composite material honeycomb structure comprises a guide groove, wherein the composite material honeycomb enters a positioning device along the guide groove, and the honeycomb is positioned in a positioning hole of the positioning device.
Further, the cooling device also comprises a guide column and an air supply device for cooling the rapid solidification device and the composite material honeycomb; the rapid curing device is provided with a guide hole matched with the guide post and ascends and descends along the guide post when ascending and descending.
The invention also provides a rapid curing method of the composite material honeycomb, which adopts the rapid curing system of the composite material honeycomb and comprises the following steps:
s1: conveying the composite material honeycomb to be cured to a positioning device;
s2: starting a lifting device to enable the curing core to ascend and be inserted into the honeycomb of the composite material honeycomb;
s3: starting the heating rod, heating and expanding the curing core, and extruding redundant resin on the composite material honeycomb;
s4: closing the heating rod, starting the air supply device to blow off the redundant resin, and closing the air supply device after a period of time;
s5: starting the heating rod again to heat the curing core, and realizing honeycomb curing of the composite material honeycomb by controlling the heating temperature and the heating time of the curing core;
s6: after solidification, the air supply device is started again to cool the solidification core, and after the solidification core shrinks and is separated from the composite material honeycomb, the lifting device is started to enable the solidification core to descend and exit the honeycomb of the composite material honeycomb.
The invention has the advantages and positive effects that: the invention provides a rapid curing device, a curing system and a curing method of a composite honeycomb based on a thermoforming method, and the rapid curing device, the curing system and the curing method of the composite honeycomb can continuously, rapidly and efficiently produce honeycombs with stable quality.
The invention adopts a heating wire heating and curing device. In order to facilitate the installation and maintenance of the electric heating wire, the curing device is designed into a detachable structure. The external curing core is heated by the internal electric heating wire, and the composite material honeycomb is expanded and extruded to reach the set temperature and pressure, so that curing is realized. The control of the heat production of the electric heating wire is realized by controlling the current of the electric heating wire. Feedback adjustments are made by measuring the temperature of the curing core.
Drawings
Fig. 1 is a schematic diagram of the operation of a rapid curing system for composite honeycombs according to the present invention.
Fig. 2 is a schematic structural diagram of a rapid curing system for composite honeycombs according to the present invention.
Fig. 3 is a schematic structural diagram of a rapid curing device for composite material honeycombs according to the present invention.
Fig. 4 is a schematic structural view of a heating rod of the present invention.
Fig. 5 is a schematic structural diagram of a spacing head of the present invention.
FIG. 6 is a schematic diagram of a curing core of the present invention.
FIG. 7 is a cross-sectional view of a front view of one type of support block of the present invention.
FIG. 8 is a bottom view of a support block of the present invention.
FIG. 9 is a schematic structural view of a curing unit base plate of the present invention.
FIG. 10 is a schematic view of a puck of the present invention.
In the figure: 1. a composite honeycomb; 2. positioning a plate; 3. a rapid curing device for the composite honeycomb; 4. a limiting head; 5. solidifying the core; 6. a heating rod; 7. an electric heating wire; 8. a support block; 9. a curing device floor; 10. a cylinder; 11. a guide post; 12. a base; 13. a control system; 14. a central bore of the support block; 15. a radial projection; 16. a radial groove; 17. a wire passing groove; 18. a groove of the curing device base plate; 19. and (7) positioning the holes.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments are enumerated in conjunction with the accompanying drawings, and the following detailed description is given:
referring to fig. 1 to 10, a device 3 for rapidly curing a composite material honeycomb includes a support block 8, a heating rod 6, and a cylindrical curing core 5 with a hole in the center, wherein the support block 8 has a through hole in the center; the bottom end of the heating rod 6 is inserted into the central hole 14 of the supporting block; the curing core 5 is sleeved on the outer side of the heating part of the heating rod 6, and the bottom surface of the curing core is in contact with the top surface of the supporting block 8; the solidified core 5 has a thermal expansion coefficient of 15 x 10-6/℃～25×10-6/° C and the heat-resistant temperature is more than or equal to 100 ℃; the outer side surface shape of the cured core 5 matches the honeycomb inner side surface shape in the composite material honeycomb 1.
The honeycomb material is a sandwich structure, a sandwich layer of which consists of a series of cells which are hexagonal, quadrangular or in other shapes and are similar to honeycombs, and thin panels/skins are glued on the upper surface and the lower surface of the sandwich layer. Composite honeycomb herein refers to a sandwich of honeycomb materials.
Further, a curing device base plate 9 for positioning the curing core 5; the upper surface of the curing device bottom plate 9 is provided with a groove which can be matched with the lower end of the supporting block 8; the supporting block 8 is inserted into the groove; a through hole can be opened in the center of the groove; the power line of the heating rod 6 can be led out from the through hole in the groove. The recesses 18 of the base plate of the curing apparatus are shown in figure 9.
Furthermore, the curing device also comprises a limiting head 4 positioned at the top of the curing core 5, wherein the limiting head 4 can be in a frustum or frustum shape, the upper surface of the curing core 5 can be provided with a radial groove 16 or a radial protrusion 15, and the lower surface of the limiting head 4 is correspondingly provided with the radial protrusion 15 or the radial groove 16 matched with the upper surface of the curing core 5; the limiting head 4 can be fixedly connected with the heating rod 6.
Further, the heating rod 6 may include a heating column having a spiral groove formed on an outer surface thereof and a heating wire 7 wound along the spiral groove; the electric heating wire 7 does not protrude out of the outer surface of the heating upright post; the outer surface of the heating upright post is insulated and can be made of a material with the heat conductivity coefficient less than or equal to 2.00W/m.K. The electric heating wire 7 does not protrude out of the outer surface of the heating column, so that friction caused by contact with the inner wall of the curing core 5 can be avoided, and electric leakage can be avoided if the curing core 5 is made of non-metal materials.
The invention also provides a rapid curing system of the composite material honeycomb 1, which comprises the rapid curing device 3 of the composite material honeycomb.
Further, the device also comprises a control system 13, a temperature detection device, a lifting device and a positioning device; the positioning device can be used for positioning the honeycomb position in the composite material honeycomb 1 and can comprise a positioning disc 2, and positioning holes 19 which are in clearance fit with the curing cores 5 can be formed in the positioning disc 2 corresponding to the honeycomb position; the lifting device can be used for lifting the rapid curing device, so that the curing core 5 can be upwards inserted into or downwards withdrawn from the honeycomb in the composite material honeycomb 1; the temperature detection device can be used for detecting the temperature of the curing core 5 and sending a detection signal to the control system 13; the control system 13 can be used for receiving the detection signal of the temperature detection device and controlling the operation of the heating rod 6 and the lifting device.
Further, the positioning holes 19 formed in the positioning device corresponding to the honeycomb positions may be hexagonal holes.
Further, a feeding device can be further included; the feeding device can be used for placing the composite material honeycomb 1 on the positioning device; it may comprise a guide channel along which the composite material honeycomb 1 can be introduced onto the positioning device, and its honeycomb is located in the positioning hole 19 of the positioning device.
Further, the device also comprises a guide column 11 and an air supply device for cooling the rapid solidification device and the composite material honeycomb 1; the rapid curing device 3 of the composite material honeycomb can be provided with a guide hole matched with the guide post 11, and the rapid curing device 3 of the composite material honeycomb can ascend and descend along the guide post 11 when ascending and descending.
The temperature detection device, the lifting device, the feeding device, the air supply device and the positioning device can also adopt devices or structures which realize the same function in the prior art, and can also adopt components in the prior art and adopt the conventional technical means to construct.
The invention also provides a rapid curing method of the composite material honeycomb 1, which adopts the rapid curing system of the composite material honeycomb 1 and comprises the following steps:
s1: conveying the composite material honeycomb 1 to be cured to a positioning device;
s2: starting a lifting device to enable the curing core 5 to ascend and be inserted into the honeycomb of the composite material honeycomb 1;
s3: starting the heating rod 6, heating the curing core 5 to expand, and extruding out redundant resin on the composite material honeycomb 1;
s4: closing the heating rod 6, starting the air supply device to blow off the redundant resin, and closing the air supply device after a period of time;
s5: the heating rod 6 is started again to heat the curing core 5, and the honeycomb curing of the composite material honeycomb 1 is realized by controlling the heating temperature and the heating time of the curing core 5;
s6: after the solidification is finished, the air supply device is started again to cool the solidification core 5, and after the solidification core 5 shrinks and is separated from the composite material honeycomb 1, the lifting device is started to enable the solidification core 5 to descend and exit the honeycomb of the composite material honeycomb 1.
The control system 13 is used for controlling the heating start and stop of the heating rod 6 and the lifting of the lifting device.
The structure and operation of the present invention will be further described below in accordance with a preferred embodiment of the present invention:
the invention is pressurized in a thermal expansion mode, the curing core 5 of the curing device is made of a material with high thermal expansion coefficient, and the size of the curing core 5 is determined according to the size of the composite material honeycomb 1, the curing temperature and the expansion coefficient of the thermal expansion material.
The invention adopts the electric heating wire 7 for heating. A heating rod 6 including a heating wire 7 is positioned inside the curing core 5, and the heating of the heating wire 7 is controlled by controlling the current of the heating wire 7. The temperature of the curing core 5 is measured by the temperature detection device, the detected signal is sent to the control system 13 as a feedback signal, and the control system 13 performs temperature regulation control according to the feedback temperature signal.
In order to facilitate the installation and maintenance of the heating wire 7, the curing device is provided in a detachable structure. The external curing core 5 is heated by the internal heating wire 7, and the composite material honeycomb 1 is expanded and extruded to reach the set temperature and pressure, so that curing is realized.
The curing core 5 has a thermal expansion coefficient of 15 to 25 x 10-6The temperature is higher than 100 ℃. The dimensions of the cured core 5 are determined according to the dimensions of the composite honeycomb 1, the temperature of curing and the coefficient of expansion of the thermal expansion material.
The invention adopts a heating device with an electric heating wire 7. The heating wire 7 is positioned inside the curing core 5, and the heating wire 7 does not protrude out of the outer surface of the heating column. The control of the heat generation of the heating wire 7 is realized by controlling the current of the heating wire 7. Feedback regulation is performed by measuring the temperature of the curing core 5.
In order to facilitate the installation and maintenance of the heating wire 7, the curing device is designed to be detachable. The external curing core 5 is heated by the internal heating wire 7, and the composite material honeycomb 1 is expanded and extruded to reach the set temperature and pressure, so that curing is realized.
As shown in fig. 2, the present invention provides a continuous rapid curing system for composite honeycomb 1, which cures composite honeycomb 1 on the surface of a positioning support member. The rapid curing system comprises a control system 13, a temperature detection device, a lifting device, a feeding device, an air supply device, a positioning device, a curing device and a base 12. The curing device comprises a supporting block 8, a heating rod 6, a curing core 5, a limiting head 4, a guide column 11 and a curing device bottom plate 9.
The temperature detection device comprises a temperature sensor, the lifting device comprises an air cylinder 10, the feeding device comprises a hopper and a guide groove, the air supply device comprises a compressed air supply pipeline, and the positioning device comprises a positioning disc 2.
Rapid curing system for composite honeycomb 1 is cured according to the principle in figure 1. Based on the structure of the composite honeycomb 1, cuts were made in the prepreg using a cutting device prior to curing. The composite prepreg passes through a cutting device, and the cutting device cuts two rows of cuts perpendicular to the movement direction in one action. The distance between the two rows of cuts is determined based on the height of the composite honeycomb 1. The length of each notch on each row is three times of the side length of the hexagonal honeycomb, and the distance between two adjacent notches is the side length of the hexagonal honeycomb. The distance between the outermost edge of the first notch and the outermost edge of the last notch on the first row of notches and the edge of the prepreg is the side length of the hexagonal honeycomb, and the number of the notches on each row of notches is determined according to the width of the honeycomb material. The first and last incisions on the second row of incisions are incomplete incisions starting from the edge of the prepreg and having a length of twice the length of the hexagonal honeycomb edge. And (4) enabling the cut prepreg to pass through a folding device, and folding the prepreg of the composite material by the folding device to form the shape and the state required by the curing stage.
The resin recovery device for recovering the extruded resin can be additionally arranged, can be integrally arranged with the curing device bottom plate 9, can also be made of sheet metal parts and fixed on the curing device bottom plate 9, and is additionally provided with a filter screen to prevent the cured resin from falling into the resin recovery device. The excess resin flows into the resin recovery device by the blower. Meanwhile, the surface of the resin recovery device can be coated, so that the adhesion of resin is prevented, and the resin can flow conveniently.
The prepreg of the composite material honeycomb 1 is cut and folded to form the shape and state required by the curing stage, and a feeding device conveys the prepreg onto a positioning disc 2, as shown in fig. 2. And (3) actuating the cylinder 10, inserting the quick curing device 3 of the composite material honeycomb into the composite material honeycomb 1, heating by the heating wire 7, expanding the curing core 5, extruding the composite material honeycomb 1, allowing the redundant resin to flow out from the gap of the positioning disc 2, falling onto the bottom plate 9 of the curing device, and flowing into the resin recovery device under the blowing of compressed air.
As shown in fig. 3, the rapid curing device 3 for composite material honeycomb comprises a heating rod 6, a limiting head 4, a curing core 5 made of thermal expansion material and a supporting block 8.
First, the heating wire 7 is wound around the heating rod 6 (as shown in fig. 4), and one end of the heating wire 7 is inserted into a hole at the top end of the heating rod 6 and wound according to a spiral line on the heating rod 6. The bottom of the heating rod 6 is provided with a through hole through which the electric heating wire 7 penetrates. The heating rod 6 is connected with the curing device limiting head 4 by bolts, and then is connected with the curing device supporting block 8. The outer surface of the heating rod 6 is made of a material with insulation and heat conductivity coefficient less than or equal to 2.00W/m.K, so that the electric leakage and the damage of expansion to the electric heating wire 7 and other parts in the heating process are prevented. The total length of the spiral and the pitch of the spiral on the heating rod 6 are designed according to the height of the composite honeycomb 1 and the heating speed.
The spacing head 4 is shown in figure 5. The spacing head 4 facilitates insertion of the curing device into the composite honeycomb 1. The evenly distributed limiting strips are designed below, so that the curing core 5 is ensured to expand according to the set direction, and the pressure is ensured to be even. The round boss is arranged in the middle of the curing core, so that the curing core 5 is limited during connection, excessive pressure is not generated on the curing core 5, and the curing core 5 is guaranteed to expand freely when heated. In addition, the thermal expansion coefficient of the material for manufacturing the stopper 4 of the curing device is (15-25) × 10-8/℃。
The curing core 5 is made of a thermally expansive material as shown in fig. 6. The wall thickness depends on the strength of the thermal expansion material, and the pressure on the composite material honeycomb 1 after thermal expansion is ensured to reach a set value and the curing pressure is uniform. In consideration of the phenomenon of non-uniform thermal deformation, the shape of the curing core 5 can be designed to be compensated, and the phenomenon of non-uniform pressure caused by non-uniform thermal deformation is prevented. The upper end of the curing core 5 is correspondingly provided with a radial groove 16 which is matched with a radial bulge 15 on the limiting head 4 of the curing device, and the radial groove 16 and the radial bulge 15 are in clearance fit, so that the smooth movement of the curing core 5 during expansion is ensured. The lower end of the curing core 5 is provided with a wire passing groove 17, and the heating wire 7 can be led out through the wire passing groove 17.
The support block 8 is shown in fig. 7 and 8. A through hole is formed in the center of the supporting block 8; the bottom end of the heating rod 6 is inserted into the central hole 14 of the supporting block, and the heating rod 6 and the supporting block 8 are fixed by bolts, so that the position of the heating rod is ensured to be in the center of the curing core 5 and is kept unchanged in the heating process.
The assembled rapid curing device 3 of the composite honeycomb, as shown in fig. 3, is inserted into the groove 18 of the curing device base plate and mated as a transition fit. The bottom of the groove 18 of the bottom plate of the curing device is provided with a through hole, so that the curing device is convenient to disassemble. Baffles for limiting the flow of the resin are added around the bottom plate 9 of the curing device, so that the resin can flow into the resin recovery device. The connection between the parts of the curing device is required to ensure that the curing core 5 does not move after being heated and expanded.
The composite material honeycomb 1 is moved to a positioning device through a feeding device, the positioning device is shown in figure 10, and a positioning hole 19 which is in clearance fit with the curing core 5 is formed in the position, corresponding to the honeycomb, of the positioning disc 2; the section of the positioning hole 19 is a regular hexagon, wherein the side length of the regular hexagon at the upper part of the positioning hole 19 is larger than that of the regular hexagon of the composite material honeycomb 1; the length of the side of the regular hexagon at the lower part of the positioning hole 19 is larger than that of the curing core 5 of the curing device, thereby ensuring the smooth insertion of the curing device.
When the composite prepreg passes through curing equipment, a cylinder 10 inserts a curing device into a composite honeycomb 1, an electric heating wire 7 is electrified for heating, a curing core 5 is heated and expanded, pressure is applied to the composite honeycomb 1, redundant resin on the surface of the composite honeycomb 1 is extruded out, and the redundant resin flows onto a bottom plate 9 of the curing device through gaps of a positioning support member and a support block 8 of the curing device. The resin smoothly flows to one side by the air blowing device and flows into the resin recovery device.
The curing core 5 transfers the temperature to the composite material honeycomb 1 to cure. An infrared temperature sensor is arranged to transmit the surface temperature of the curing core 5 to the control system 13 for feedback adjustment, so that the temperature of the curing core 5 is ensured to be at a set value, and the curing quality is ensured.
After the solidification is finished, the heating device stops heating, and the air supply device blows compressed air with lower temperature to the surface of the solidification core 5 to accelerate cooling. And after the composite material honeycomb 1 and the curing core 5 are completely cooled and separated, pulling out the curing device to realize demoulding. The curing device is inserted into the adjacent uncured composite honeycomb 1 and the curing process is performed again to achieve continuous and rapid production of the honeycomb.
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to carry out the same, and the present invention shall not be limited to the embodiments, i.e. the equivalent changes or modifications made within the spirit of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The device for quickly curing the composite material honeycomb is characterized by comprising a supporting block, a heating rod and a cylindrical curing core with a hole in the center, wherein the center of the supporting block is provided with a through hole; the bottom end of the heating rod is inserted into the central hole of the supporting block; the curing core is sleeved outside the heating part of the heating rod, and the bottom surface of the curing core is in contact with the top surface of the supporting block; the solidified core has a thermal expansion coefficient of 15 x 10-6/℃～25×10-6/° C and the heat-resistant temperature is more than or equal to 100 ℃; the shape of the outer side surface of the cured core is matched with the shape of the inner side surface of the honeycomb in the composite material honeycomb.
2. The apparatus of claim 1, further comprising a curing apparatus base plate for positioning the curing core; the upper surface of the curing device bottom plate is provided with a groove matched with the lower end of the supporting block; the supporting block is inserted into the groove; a through hole is formed in the center of the groove; the power line of the heating rod is led out from the through hole in the groove.
3. The device for rapidly curing the composite material honeycomb according to claim 1, further comprising a limiting head positioned at the top of the curing core, wherein the limiting head is in a frustum or frustum shape, the upper surface of the curing core is provided with radial grooves or protrusions, and the lower surface of the limiting head is correspondingly provided with radial protrusions or grooves matched with the upper surface of the curing core; the limiting head is fixedly connected with the heating rod.
4. The rapid curing device for the composite material honeycomb according to claim 1, wherein the heating rod comprises a heating upright post with a spiral groove on the outer surface and a resistance wire wound along the spiral groove; the resistance wire does not protrude out of the outer surface of the heating upright post; the outer surface of the heating upright post is insulated and made of a material with the heat conductivity coefficient less than or equal to 2.00W/m.K.
5. A rapid curing system for composite honeycombs including the rapid curing apparatus for composite honeycombs claimed in any one of claims 1 to 4.
6. The system for rapid curing of composite honeycomb according to claim 5, further comprising a control system, a temperature detection device, a lifting device, and a positioning device; the positioning device is used for positioning the honeycomb position in the composite material honeycomb and comprises a positioning disc, and positioning holes in clearance fit with the curing cores are formed in the position, corresponding to the honeycomb, of the positioning disc; the lifting device is used for lifting the rapid curing device to enable the curing core to be upwards inserted into or downwards withdrawn from the honeycomb in the composite material honeycomb; the temperature detection device is used for detecting the temperature of the curing core and sending a detection signal to the control system; the control system is used for receiving the detection signal of the temperature detection device and controlling the heating rod and the lifting device to work.
7. The system of claim 6, wherein the positioning holes formed in the positioning device corresponding to the honeycomb are hexagonal holes.
8. The system for rapid curing of composite honeycombs according to claim 6, further including a feed device; the feeding device is used for placing the composite material honeycomb on the positioning device; the honeycomb-shaped composite material honeycomb structure comprises a guide groove, wherein the composite material honeycomb enters a positioning device along the guide groove, and the honeycomb is positioned in a positioning hole of the positioning device.
9. The system of claim 6, further comprising a guide post and an air blower for cooling the rapid solidification device and the composite honeycomb; the rapid curing device is provided with a guide hole matched with the guide post and ascends and descends along the guide post when ascending and descending.
10. A method of rapid curing of a composite honeycomb using the system of claim 6, comprising the steps of:
s1: conveying the composite material honeycomb to be cured to a positioning device;
s2: starting a lifting device to enable the curing core to ascend and be inserted into the honeycomb of the composite material honeycomb;
s3: starting the heating rod, heating and expanding the curing core, and extruding redundant resin on the composite material honeycomb;
s4: closing the heating rod, starting the air supply device to blow off the redundant resin, and closing the air supply device after a period of time;
s5: starting the heating rod again to heat the curing core, and realizing honeycomb curing of the composite material honeycomb by controlling the heating temperature and the heating time of the curing core;
s6: after solidification, the air supply device is started again to cool the solidification core, and after the solidification core shrinks and is separated from the composite material honeycomb, the lifting device is started to enable the solidification core to descend and exit the honeycomb of the composite material honeycomb.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111444003.0A CN114193677A (en) | 2021-11-30 | 2021-11-30 | Rapid curing device, curing system and curing method for composite honeycomb |
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|---|---|---|---|---|
| US5354394A (en) * | 1992-11-10 | 1994-10-11 | Seeton Technologies | Apparatus and method for forming honeycomb core |
| CN111674058A (en) * | 2020-06-01 | 2020-09-18 | 南京航空航天大学 | Preparation device and method of carbon fiber three-dimensional woven honeycomb composite material |
| CN113561522A (en) * | 2021-07-19 | 2021-10-29 | 南京航空航天大学 | Three-dimensional woven fiber reinforced honeycomb preparation device and method based on thermal expansion flexible core mold |
| CN113665034A (en) * | 2021-07-30 | 2021-11-19 | 南京玻璃纤维研究设计院有限公司 | Composite material forming die and forming method |
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2021
- 2021-11-30 CN CN202111444003.0A patent/CN114193677A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354394A (en) * | 1992-11-10 | 1994-10-11 | Seeton Technologies | Apparatus and method for forming honeycomb core |
| CN111674058A (en) * | 2020-06-01 | 2020-09-18 | 南京航空航天大学 | Preparation device and method of carbon fiber three-dimensional woven honeycomb composite material |
| CN113561522A (en) * | 2021-07-19 | 2021-10-29 | 南京航空航天大学 | Three-dimensional woven fiber reinforced honeycomb preparation device and method based on thermal expansion flexible core mold |
| CN113665034A (en) * | 2021-07-30 | 2021-11-19 | 南京玻璃纤维研究设计院有限公司 | Composite material forming die and forming method |
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