JPH04144717A - Method and device for controlling local heating in autoclave molding - Google Patents

Abstract

PURPOSE:To reduce the dispersion of heating, and to bond and cure the whole molding material uniformly by circulating a high-pressure heating gas while controlling the temperature of the whole even by utilizing a local heating means. CONSTITUTION:The signals of temperature sensors 11 inserted to the proper positions of a molding materials 1 are arithmetically operated by a computer, and the set value of a gas temperature is calculated according to a logic set and the gas temperature is controlled. Temperature sensors 15a, 15b, 15c, 15d are arranged in a gas flow path in an air duct 8b formed in a pressure vessel A and the surfaces of the desired sections of the molding materials 1 or peripheral sections thereof. Local heating means 18 disposed to the peripheral sections of the molding materials 1 and temperature comparison regulators 17 are connected through controllers 16, the detecting signal of a temperature detecting means K is input to the temperature comparison regulators 17 and detecting signal values are compared, and transmitted over the controllers 16 and the local heating means 18 are operated, and the desired sections 1a of the molding materials 1 are heated locally and controlled at required temperatures.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is directed to autoclave molding of fiber-reinforced plastic (FRP) molding materials for structures and components of aircraft, space equipment, etc. The present invention relates to a method and apparatus for locally controlling temperature during heating.

[Conventional technology]

Conventionally, when fiber reinforced plastic (FRP) is molded in an autoclave, a method based on experience has generally been used as a technique for heating the molded material. for example,
JP-A-61-94742, JP-A-63-7461
Many such methods are known, including those described in Publication No. 3.

These technologies, as shown in Figs. 7 and 8,
The molded material 1 placed on the upper jig 9 is accommodated together with the trolley 3.
A pressure vessel A that is sealed with a pressure vessel A, a pressurizing means B that supplies high pressure gas into the pressure vessel A to pressurize the molded material 1, and a pressurizing means B that supplies high pressure gas into the pressure vessel A to pressurize the molded material 1; heating by heater 5 and cooler 6 installed in
A fan driving device E comprising a heating/cooling means C for cooling and a fan 7 for blowing gas heated or cooled by the heating/cooling means C into the pressure vessel A is connected to the heating/cooling means C at a rear part inside the vessel. a gas circulation means F which is provided adjacently and which circulates the blown gas through a wind tunnel 8 provided along the container A to heat or cool the molded material 1; and a vacuum bag 21 which seals the molded material 1. We find the best values through experiments to find the best values for the properties and structure of the prepreg resin, the shape of the molded material, changes in wall thickness, etc., and then adjust the values. The operator can program the molding program into the molding material and insert a temperature sensor into the molded material at the appropriate location, and the operator can manually adjust the temperature while monitoring the temperature of the molded material. Insert the temperature sensor, calculate the signal of the temperature sensor with a computer,
It consists of a temperature control means that controls the molding program according to the computer-set molding program.

In this case, in small autoclaves such as testing machines and small-scale autoclaves, the number of molded materials (items) stored in the pressure vessel is small, and the molded materials themselves are small and change in wall thickness is small, and the shape is also small. It is relatively simple, and therefore, when the adhesive is cured by heating and pressing, there is little temperature difference depending on the wall thickness, and it can be molded without causing temperature unevenness due to differences in location.

[Problem to be solved by the invention]

However, in recent years, there has been an increase in demand for aircraft structures and their component parts made of fiber-reinforced plastic (FRP), and large-scale autoclaves for production purposes have been required. In this case, the structures and parts housed inside the pressure vessel also become large, have complex shapes, and vary in wall thickness, and molding materials of different materials may be molded at the same time. Parts that are hit by the flow and parts that are not hit by the gas flow (shade of the gas flow)
The temperature of the gas flow also becomes higher in the upstream part (discharge part) and the downstream part (suction part) of the wind tunnel, resulting in a difference in temperature. If such a molded material is molded using a method similar to that used in a small autoclave, temperature fluctuations will occur due to changes in wall thickness and shape as mentioned above, resulting in variations in adhesion, making reliability critical for space equipment, aircraft, etc. It cannot be used for structures or parts that are visible.

Therefore, prior to the present invention, the applicant calculated and set the gas temperature according to a certain logic, and controlled the temperature by comparing the set value and the actual value, with the aim of solving the problems of the temperature control means. We have developed a storage control method for autoclave molding.

As shown in FIG. 4, this technology detects the temperature Ptn of the molded material (temperatures of all sensors) using a temperature sensor 11 inserted at a suitable position in the molded material 1, and transmits the detected signal to an analog multiplexer. 12 (Analog multiplexer is a converter that converts the electromotive force of a thermocouple into actual temperature)
Input the signal converted by the analog multiplexer 12 and the temperature detection means H that transmits the signal to The property of the resin part of the prepreg composing the molding material 1 is the maximum allowable temperature value as it is heated. Indicates the average value of all temperature sensors (thermocouples) inserted at

ΔHsp: The amount of change in the maximum temperature setting value, as shown in FIG.
expressed as the slope of

ΔPt: The amount of change in the average value of all the sensors used, as shown in Figure 5, the amount of increase ΔTbn in the average value of all the sensors used with respect to the amount of change Δtn over time, that is, expressed as the slope of ΔPt = ΔTbn/Δtn. .

ΔHsp/ΔPt: Rising speed ratio for maintaining the rising curve in accordance with the maximum temperature setting value Hsp. It also plays a role in maintaining the rising speed closer to the maximum temperature set value Hsp.

PID%: This shows how much the maximum temperature Pmax deviates from the maximum temperature setting value Hsp by comparing the maximum temperature Pmax of the molding material and the maximum temperature setting value Hsp among the average value Pt of all the sensors used, The value is 0-1.

α: Correction coefficient, obtained from experiments, and its value is generally 1 to 5.

The gas temperature set value Asp is calculated according to the logic of
The computer 13 that calculates the gas temperature compares the set value Asp of the gas temperature calculated by the computer 13 with the actual gas temperature Apv, and operates the heater 5 or cooler 6 of the heating/cooling means C shown in FIG. The actual gas temperature Apv is heated or cooled, and the molding material temperature Pt is
It is composed of a temperature controller 14 for controlling n.

Then, as shown in Fig. 5, the temperature Pwax of the molded material does not exceed the maximum temperature setting value Hsp, and by controlling the temperature while maintaining the rate of increase closer to the maximum temperature setting value Hsp, the characteristics Since the maximum temperature setting value Hsp of the molded material created by understanding this is not exceeded, molding can be performed without impairing the properties of the resin of the molded material. Furthermore,
The variation in heating becomes extremely small, and the adhesive can be cured uniformly.

However, even if this developed first bath control method (temperature control means) is used, the following problems still remain. In other words, since the molded material is heated only by circulating heating gas and the temperature of the gas is controlled to be uniform, it is possible to accommodate fairly complex shapes and slight changes in wall thickness. When molding materials of different materials are molded at the same time, when the variation in wall thickness is extremely large, when there are parts that are exposed to the gas flow and those that are not, for example, when molding materials formed in a concave shape must be located on the leeward side, Furthermore, it is not possible to adequately cope with the temperature difference between the gas flows occurring between the upstream and downstream parts of the wind tunnel.

The present invention was developed with the aim of solving the various problems mentioned above.

[Means to solve the problem]

The present invention improves the conventional drawbacks by the configuration described in the above-mentioned claims, and in addition to circulating high-pressure heating gas, it also utilizes local heating means to control the overall temperature. This is what I decided to do.

〔Example〕

The present invention will be described in detail below with reference to the accompanying drawings.

First, in order to understand the present invention, the characteristics of the prepreg and its resin constituting the molding material will be explained.

The prepreg used here is, for example, a woven fabric made of high-strength, high-elasticity fibers such as carbon fiber, glass fiber, or aramid fiber, or a unidirectional material impregnated with a thermosetting resin using epoxy, polyimide, etc., and then B-staged. (semi-cured state). During molding, prepreg sheet-shaped molding materials 1 are laminated along a jig, and the adhesive is cured by heating and applying pressure using the pressure and temperature of the gas.
When heated, the thermosetting resin has a characteristic that it changes from a semi-cured state to a molten state when it reaches a certain temperature (for example, around 120° C.), and hardens when further heated.

Next, an apparatus for implementing the present invention will be described.

As shown in FIGS. 1 to 6, the apparatus for carrying out the present invention includes a pressure vessel A in which a molded material 1 placed on a jig 9 on a truck 3 is housed together with the truck 3 and sealed with l[2b]. , a pressurizing means B for supplying high pressure gas into the pressure vessel A to pressurize the molded material 1, and a heater 5 and a cooler 6 installed at the rear inside the pressure vessel to supply the high pressure gas introduced into the pressure vessel A. Heating and cooling means C that heats and cools the molded material 1 by heating and cooling the molded material 1; A depressurizing means that reduces the pressure in the vacuum bag 21 that seals the molded material 1 to create a high vacuum; A fan drive device E equipped with a fan 7 for blowing the gas into the pressure vessel A is provided at the rear inside the vessel, and the blown gas is circulated through a wind tunnel 8 provided along the vessel A to produce the molded material. A gas circulation means F for heating or cooling the molded material 1, and a temperature sensor 11 inserted into the appropriate position of the molded material 1, the signal of the temperature sensor is calculated by the computer 13, and the set value Asp of the gas temperature is calculated according to the set logic. and device control means G for controlling the actual gas temperature Apv by comparing the set value of the gas temperature and the actual gas temperature Apv in the pressure vessel A and heating within the allowable temperature change amount; As a local temperature detection means, temperature sensors 15a, 15b, 15C115d are disposed at appropriate locations in the gas flow path of the wind tunnel 8b provided in the wind tunnel 8b and at appropriate locations on the surface of a desired portion of the molded material 1 or its periphery. A temperature comparison controller 17 is connected via a controller 16 to a local heating means disposed at a suitable position around the periphery of the molded material 1 housed in the molded material 1; A detection signal can be input to the temperature detection means, the detected signal values are compared, and the signal is transmitted to the controller 16, which operates the local heating means to locally heat the desired portion 1a of the molded material 1. A local heating control device comprising a local temperature control means M that can be controlled to heat to a desired temperature.

Next, details of each means, member, and device will be explained.

As shown in FIGS. 1 and 2, the pressure vessel A is used for carrying in and out a main body vessel 2a and a cart 3 on which a molded material 1 sealed in a vacuum bag 21 is placed on a jig 9. rail 4
and a door 2b for sealing the main container. A heater 5 and a cooler 6 are provided inside this pressure vessel, and a double wind tunnel is installed in a parallel thin plate wind tunnel fi8c at a position in front of the heater 5 and cooler 6 and along 1iAa inside the pressure vessel A. 8 (that is, an outside ventilation passage 8a and an inside wind tunnel 8b), and a fan drive device E is disposed at the rear of the pressure vessel A.

As shown in FIG. 6, the jig 9 is formed to match the shape of the molded product, and the molded material 1 is laminated along the mold. Then, as shown in FIG.
4a and 24b so as to be able to communicate with and shut off to external pressure reducing means.

As shown in Fig. 1, the pressurizing means B is placed in the pressure vessel A with a capacity of several tens of kg/c+! , generally 20 kg/crA
A high-pressure gas supply device 25 is provided to supply the following high-pressure gases such as high-pressure nitrogen gas, high-pressure carbon dioxide gas, and high-pressure air through an automatic valve 26, and the gas is heated or cooled through a heater 5 and a cooler 6. be done. The air is then exhausted via the automatic valve 27. In addition, pressure vessel A
Safety valve 28 to reduce the pressure when the inside exceeds a predetermined pressure
has been established.

As shown in FIG. 1, the heating and cooling means C includes a heater 5 and a cooler 6 disposed on a second truck 30 at the rear of the pressure vessel A from the outside, and the automatic valve 29 penetrates the pressure vessel A. It is connected to the cooler 6 and is further provided so that the lower part of the pressure vessel A is connected from below the cooler so that cooling water can be discharged via an automatic valve 31.

The pressure reducing means is a pressure vessel A as shown in FIGS. 1 and 2.
A vacuum pump 32 installed outside of the pressure vessel A is connected to the inside of the pressure vessel A via an automatic valve 33. As shown in FIG. 2, a vacuum joint 24a is provided at the tip of the piping, and the vacuum joint 24a communicates with the inside of the vacuum bag 21, and is connected to a vacuum joint 24b which is joined in an airtight manner. It is removable. Then, by operating the vacuum pump 32, the pressure inside the vacuum bag 21, which covers and seals the molded material 1, can be reduced to a high vacuum.

As shown in FIG. 1, the gas circulation means F includes a small pressure vessel 36 with a built-in motor 35 sealed in the rear part of the pressure vessel A, and a shaft of the motor 35 that protrudes inside the rear part of the pressure vessel A. A fan driving mechanism consisting of a fan 7 fitted and fixed to the fan 7, a temperature detector 37 for detecting the temperature of the gas in the small pressure vessel 36, and a detection signal from the automatic valve 3
8 and a motor cooling means J that cools and controls the motor in the small pressure vessel to below the allowable temperature;
The gas flow flowing out from the end of the external ventilation passage 8a formed between the wind tunnel 8a and the wind tunnel 8b is reversed by the door, flows through the wind tunnel 8b, and is circulated from the suction port to the fan 7.

As shown in 4th wi, the device control means G detects the temperature Pta (temperature of all sensors) of the molded material by using a temperature sensor 11 such as a thermocouple inserted in a proper position of the molded material 1, and detects the detected temperature Pta. Temperature detection means H transmits a signal to an analog multiplexer 12 (an analog multiplexer is a converter that converts the electromotive force of a thermocouple into an actual temperature); and inputs the signal converted by the analog multiplexer 12; Asp=Hsp+C(Hsp-Pt) xΔHs
p /ΔPtXPID%]α The gas temperature set value Asp is calculated according to the logic
The computer 13 that calculates the gas temperature set value Asp calculated by the computer 13 and the actual gas temperature Apv (<the value detected by the a degree sensor 15m) are compared, and the heating/cooling means C shown in FIG. The heater 5 or cooler 6 is activated to heat or cool the actual gas temperature Apv, and a temperature controller 14 controls the temperature Ptn of the molded material.

As for the temperature control means, in the embodiments of the present invention, a recently developed device control means was explained, but as explained in the conventional technology, the temperature can be adjusted manually by the operator while monitoring the temperature of the molded material. Alternatively, a temperature control means may be used in which a temperature sensor is inserted into a suitable position of the molded material and the signal from the temperature sensor is calculated by a computer to control the molding program set by the computer. This is included in the temperature control means and is not limited to the embodiments of the present invention.

As shown in FIG. 1, the local temperature detection means includes a temperature sensor 15a such as a thermocouple supported at a location where gas flows uniformly at the entrance of the gas flow passage in the wind tunnel 8b provided in the pressure vessel A. In addition, parts of the molded material 1 set on the jig 9 on the trolley that require local heating, such as thick parts, parts with a concave shape that are not exposed to the gas flow, and parts made of different materials. In the case of molded materials, temperature sensors such as thermocouples 1 are installed at specified parts of all molded materials that are molded at the same time.
5b respectively and attach them. If the meat is thick, attach the temperature sensor inside.

Make it possible to confirm that even the darkest parts are sufficiently heated inside. In addition, a temperature sensor 15c is placed on the surface of a portion of the molded material 1 that requires local heating, and a temperature sensor 15d is also placed on a portion of the molded material 1 that is not exposed to the gas flow around the portion that requires local heating. The temperature sensors 15b inserted into the molded material 1 are sealed from the vacuum bag 21, and the temperature sensors 15a, 15b, 15c,
15d is detachable from an outlet 19 and connected to a temperature comparison controller 17 provided outside the pressure vessel as required, as shown in the first article. On the other hand, a typical temperature sensor 11 in the device control means and the maximum temperature setting value Hsp of the product in the molding program shown in FIG. 5 are connected to the temperature comparison controller 17. The terminal of the lead wire for the temperature setting value H8D is configured so that it can be appropriately selected for the reference value and the measured value and input to the temperature comparison controller 17 by, for example, switching the taps shown in FIG.

Furthermore, the temperature sensor 11 is placed at an appropriate location on the above-mentioned molded material 1, and the temperature sensor 11 is placed at a portion of the molded material 1 that requires local heating.
When installing 5b, if the temperature sensor is actually attached to the molded material itself, the attached part will be damaged after molding and the product will not be good.In general, it is necessary to contact the molded material with a jig or, It is installed nearby. but,
After molding, if a portion of the temperature sensor is removed from the molded material, it may be attached to the molded material itself.In the present invention, attaching the temperature sensor to the molded material means, as shown in FIG.
It includes both.

As shown in FIGS. 1 and 2, the local heating means performs local heating between a plurality of molded materials 1 stacked and set along a jig 9 on a trolley 3. A heater 18 such as an electric heater is set at the desired location, and the lead wire of the heater is removably attached to the inner surface of the wind tunnel wall 8C through an outlet 19 consisting of 19a and 19b, and the lead wire from the outlet is connected to the inner surface of the wind tunnel wall 8C. It penetrates the wall and is connected to a controller 16 that can control the heating temperature of the heater using a variable power thyristor, electromagnetic controller, etc., and is further connected to a temperature comparison controller 17.

Note that the shape of the heater 18 is formed in accordance with the size and shape of the portion of the molded material 1 to be heated. For example, molding material 1
If the shape of the local heating is concave as shown in FIGS. 3a and 3b, the heater is formed accordingly, and is preferably formed according to the shape of the molded material and the installation location.

Further, in this embodiment, an electric heater is used as the heater 18 for ease of control, but if it is controllable, another heater such as a gas heater may be used, and an automatic valve may be used as the controller 16. The present invention is not limited to the embodiments.

The local temperature control means M, as shown in FIG.
15d, 11 and the maximum temperature setting value Hsp can be appropriately selected and inputted to the temperature comparison controller 17. A temperature sensor 15a provided in the gas flow path in the wind tunnel, a temperature sensor 15b provided in a desired portion of the molded material,
A preselected temperature is detected between the temperature sensor 15c provided on the surface and the temperature sensor 15d provided around it, and the detected values are compared by the temperature comparison controller 17, and the deviation amount ΔX is transmitted to the controller 16, and the heater 18 of the local heating means is operated to heat a desired portion of the molded material 1. Then, the temperature control is performed according to the amount of deviation that changes from time to time so that heating is stopped when the amount of deviation disappears. In addition, before the heating and cooling means C is activated by the storage control means G, the local heating means is independently activated to locally heat a desired portion of the molded material 1 to a temperature at an arbitrary point in the molding program set in advance. It is also possible to actuate the storage control means G after heating the molded material 1 and raising the temperature of that part before other parts of the molded material 1.

By heating in advance in this manner, the extremely thick portion of the molded material 1 can be brought to approximately the same temperature as other thin portions.

Next, its effect will be explained.

First, as shown in FIGS. 1 and 2, the jig 9 is placed on the trolley 3, and then the molded material 1 is laminated along the jig 9 as shown in FIG. Insert the temperature sensor in place along with the temperature sensor. At this time, the temperature sensor 11 for the storeroom control means and the temperature sensor 15b for the local heating means are distinguished by a reference numeral or the like. Then, it is covered with a vacuum bag 21, completely sealed, and set. Next, the local heating heater 18 is set at a required location on the molded material 1, and the molded material 1 is carried into the pressure vessel A. Here, if necessary, a temperature sensor 15a is placed at an appropriate position in the gas flow inside the wind tunnel 8b of the pressure vessel, a temperature sensor 15c is placed on the surface of a desired portion of the molded material 1, and a temperature sensor 15c is placed on the surface of a desired portion of the molded material 1. Temperature sensors 15d are provided in the periphery, but this embodiment will be explained using temperature sensors 11 and 15b.

Then, the lead wires of the temperature sensor and the heater are connected to the outside of the vessel, and the vacuum joint 24a is connected to the vacuum joint 24b of the piping section inside the pressure vessel, and the door 2b is closed.
Seal it tightly.

Next, the vacuum pump 32 and automatic valve 33 shown in FIG. 1 are operated to reduce the pressure inside the vacuum bag 21.

By reducing the pressure inside the vacuum bag in this way, first, the air present when the molded materials 1 are stacked is discharged to the outside through the vacuum joints 24b to 24a by the vacuum action.

Next, the automatic valve 26 of the pressurizing means B shown in FIG. 1 is operated to supply high pressure gas into the pressure vessel A, and the vacuum bag 21 is
The molded material 1 is pressurized via the heating and cooling means C, and the heater 5 of the heating and cooling means C is operated to heat the high pressure gas in the pressure vessel A. Next, the motor 35 of the fan drive means is operated to rotate the fan 7, and the heated gas is formed between the fiAa inside the container and the wind tunnel wall 8C by the fan 7, as shown in FIG. The air flows straight through the outside ventilation passage 8a.

Then, the gas flows out from the end of the external ventilation passage 8a and is reversed by the inside fi2c of the door, and the reversed flow flows into the wind tunnel 8b, where the gas is heated or cooled through the heater 5 and the cooler 6 and sucked. The air is then circulated through the pressure vessel A again by the fan 7 through the wind tunnel.

When heating the gas, the gas is heated according to the logic as described above.

At this time, the temperature will be controlled according to this logic, but first, the maximum temperature setting value H
The curing pattern of the molded material 1 in which sp, the amount of change in time ΔtQ, and the correction coefficient α are programmed is stored.

Next, as shown in FIG. 4, a large number of temperatures are detected by a thermocouple (temperature sensor) 11 inserted into the molded material 1,
The detected signal is transmitted to an analog multiplexer 12 to convert the electromotive force of the thermocouple 11 into an actual temperature, and then the signal converted by the analog multiplexer 12 is input to a computer 13 to generate a large number of temperatures. , and calculate the average value Pt.

Next, in this computer 13, the maximum temperature setting value Hsp and the maximum temperature Pmax of the molding material are compared, and PID% is calculated in proportion to the difference.

Then, previous data measured over time is stored.

The above values are calculated by the computer 13 according to logic. That is, as shown in FIG. 5, the rising speed ratio ΔHs p /Δ
pt, and then add the maximum temperature setting value Hsp to the value multiplied by PID% and the correction coefficient α to calculate the gas temperature setting value Asp, and transmit the value of Asp to the temperature controller 14. .

Here, this temperature controller 14 uses the value of Asp transmitted from the computer 13 and the actual gas temperature A in the pressure vessel.
The heater 5 or cooler 6 of the heating/cooling means is operated in comparison with pv to make the actual gas temperature Apv coincide with the gas temperature set value Asp.

Then, as shown in FIG. 5, by controlling the actual gas temperature, the temperature P Iaax of the molding material is adjusted to the maximum temperature setting value Hsp.
Temperature control is performed while maintaining a rate of increase that does not exceed the maximum temperature setting value Hsp and approaches the maximum temperature setting value Hsp.

Simultaneously with or in advance of the progress of the storage control, the local temperature control means M is activated to locally heat the molded material 1, that is, as shown in FIG. 1, the temperature sensor 11 selected for the reference value is activated. The temperature comparison controller 17 compares the detected values with the measurement temperature sensor 15b provided at a desired part of the molded material, and transmits the deviation amount ΔX to the controller 16, which turns on the heater 18 as a local heating means. The temperature is controlled in accordance with the constantly changing amount of deviation so that the desired portion of the molded material 1 is heated and the heating is stopped when the amount of deviation ΔX disappears. When the resin part of the molded material 1 is in a molten state, it is pressurized as shown in the molding program in Figure 5, and the temperature of the molded material 1 is further increased until it reaches a specified temperature and is maintained at that temperature for a while. The molding material 1 is adhesively cured.

Next, the pressure vessel A is operated by operating the cooler 6 shown in FIG.
The heated high-pressure gas inside is cooled, and the cooled high-pressure gas is blown by the fan 7 from the outside ventilation passage 8a to the door inner wall 20.
- The molded material 1 is uniformly cooled by circulating inside the pressure vessel A through the wind tunnel 8b.

Next, the automatic valve 27 is operated to gradually reduce the pressure inside the pressure vessel A. When the molded material 1 is cooled, all operations are stopped, the door 2b is opened, and the molded material 1 is carried out to the outside, completing one process.

〔Effect of the invention〕

According to the present invention, the following effects are achieved.

Since the present invention is configured as described above, when molding materials of different materials are molded at the same time, which has been a problem in the past,
Each molding material can be heated at an appropriate temperature. Also,
In the case of very large changes in wall thickness, the thicker sections can be heated first or the sections can be heated in parallel. In addition, when a part of the molded material that is formed in a concave shape and a part that is not in contact with the gas flow must be located on the leeward side, only the concave part can be heated excessively. Furthermore, even if there is a temperature difference between the gas flows generated in the upstream and downstream parts of the wind tunnel, the lower temperature areas can be compensated for by local heating.

As a result, heating variations are extremely small, and the entire molded material can be bonded and cured uniformly, making it ideal for structures and parts where reliability is important, such as space equipment and aircraft.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway schematic side view showing an embodiment of the device according to the present invention, Fig. 2 is a schematic front view taken along the line X-X in Fig. 1, and Fig. 3a is a forming process using local heating means. A schematic front view of an example showing the positional relationship between the material and the heater;
FIG. 3b is a schematic side view of FIG. 3a showing an embodiment of the heater shape, FIG. 4 is a block diagram showing the configuration of the initial hot water control means that constitutes a part of the configuration of the embodiment of the present invention, and FIG. 5 is a schematic side view of FIG. A time-temperature graph to explain the logic of an embodiment of the present invention.
Figure 6 is a schematic side sectional view showing an example of mounting a temperature sensor in a local temperature detection means; Figure 7 is a diagram showing a pattern of a molding program with pressure characteristics; Figure 7 is a diagram showing a conventional molded material of fiber-reinforced plastic being heated under pressure. FIG. 8 is a partially cutaway schematic side view of an autoclave molding apparatus for bonding and curing, and FIG. 8 is a schematic front view of FIG. 7 with the door open. A: Pressure vessel, Aa: Inner wall of pressure vessel, B: Pressurizing means, C: Heating and cooling means, D = Depressurizing means,
E: Fan drive device, F: Gas circulation means, G: First bath control means, H: Temperature detection means, I: Fan drive means, J: Motor cooling means, K: Local temperature detection means, L: Local heating means, M : Local temperature control means, 1: Molding material,
1a: Desired part of molded material, 2b: Door,
3: Trolley, 4: Rail, 5: Heater 6: Cooler, 7: Fan, 8a: Outside ventilation path, 8b: Inside the wind tunnel, 8C: Wind tunnel wall,
9; Jig; 11: Temperature sensor attached to the part of the molding material that is normally heated by the heating gas flow; 12; Analog multiplexer; 13: Computer; 14. Temperature controller, 15a: Temperature sensor attached to a part of the wind tunnel gas flow passage where gas flows uniformly, 15b: Temperature sensor attached to a part of the molded material that requires local heating, 15C: Temperature sensor of the molded material 15d: Temperature sensor attached to the surface of the part of the molded material that requires local heating; 16: Control; 17: Temperature comparison controller, 18:
Heater, 19: Outlet, 21: Vacuum bag, 24a, 24b: Vacuum joint, 25: High pressure gas supply device, 26.27: Automatic valve, 28: Safety valve, 29:
Automatic valve, 30: Second truck, 31: Automatic valve, 32:
Vacuum pump, 33. automatic valve, 35: motor,
36: Small pressure vessel, 37: Temperature detector. Patent applicant: Mitsubishi Heavy Industries, Ltd. (and one other person) Figure 511 Figure 8

Claims (1)

[Scope of Claims] 1. In an autoclave equipped with a temperature control means for circulating high-pressure heated gas through a wind tunnel provided in a pressure vessel and pressurizing and heating a fiber-reinforced plastic molding material to cure the adhesive, The maximum temperature set value Hsp of the molded material of the set temperature program and the detected value of the temperature sensor 15b provided in the part of the molded material that requires local heating are compared with a temperature comparison controller, and the compared deviation amount is calculated. The information is transmitted to the controller, and the heater of the local heating means is activated to heat the desired part of the molded material, and the heating is stopped when the deviation amount disappears.
A local heating control method in autoclave molding, which is characterized by controlling temperature according to the amount of deviation that changes from moment to moment. 2. Molding with a preset temperature program is carried out in an autoclave equipped with a temperature control means that circulates high-pressure heated gas through a wind tunnel installed in a pressure vessel and pressurizes and heats the fiber-reinforced plastic molding material to harden the adhesive. A temperature comparison controller compares the maximum temperature setting value Hsp of the material with the value detected by the temperature sensor 15c provided on the surface of the part of the forming material that is not sufficiently heated due to the shadow of the heated gas flow. The compared deviation amount is transmitted to the controller, the local heating means is activated to heat the desired part of the molded material, and the deviation amount is changed from time to time so that the heating stops when the deviation amount disappears. A local heating control method in autoclave molding, characterized by controlling temperature accordingly. 3. In an autoclave equipped with a temperature control means that circulates high-pressure heated gas through a wind tunnel installed in a pressure vessel and pressurizes and heats the fiber-reinforced plastic molding material to cure the adhesive, the average temperature set in the molding material is A measuring temperature sensor 11 and a temperature sensor 15b provided at a portion of the molded material that requires local heating.
The detected values are compared with the temperature comparison controller, the compared deviation amount is transmitted to the controller, and the temperature control means operates the heater of the local heating means to heat the desired part of the molded material. Heating is stopped when the deviation amount disappears.
A local heating control method in autoclave molding, which is characterized by controlling temperature according to the amount of deviation that changes from moment to moment. 4. In an autoclave equipped with a temperature control means that circulates high-pressure heated gas through a wind tunnel installed in a pressure vessel and pressurizes and heats the fiber-reinforced plastic molding material to harden the adhesive, the gas flow path in the wind tunnel is A temperature comparison controller compares the detected values between the provided temperature sensor 15a and a temperature sensor 15d provided in a portion shadowed by the heated flow of the forming material, and transmits the compared deviation amount to the controller. The local heating means is operated to heat a desired part of the molded material, and the temperature is controlled according to the amount of deviation that changes from time to time so that heating is stopped when the amount of deviation disappears. Local heating control method in autoclave molding. 5. Preset molding is carried out in an autoclave equipped with a temperature control means that circulates high-pressure heated gas through a wind tunnel installed in a pressure vessel and pressurizes and heats the fiber-reinforced plastic molding material to harden the adhesive. The local heating means is operated independently to the temperature of an arbitrary point in the program to locally heat the part 15b of the molded material that requires local heating, and the temperature of that part is raised before other parts. Features local heating control method in autoclave molding. 6. In an autoclave molding device equipped with a temperature control means that circulates high-pressure heated gas through a wind tunnel installed in the pressure vessel and pressurizes and heats the fiber-reinforced plastic molding material to harden the adhesive. Temperature sensors are installed in the parts of the molded material that require local heating and their surrounding areas, and a temperature comparison controller is installed to compare and contrast the detected values from each temperature sensor with the maximum temperature set value of the molded material. a local temperature detection means connected to the pressure vessel so as to be selectively input; a local heating means disposed at an appropriate position around a desired portion of the molded material housed in the pressure vessel; It is connected to a temperature comparison controller, and the temperature comparison controller can input a detection signal by selecting the reference value and measurement value selected by the temperature detection means, and compare the detection signal values to determine the amount of deviation. A local heating control device for autoclave molding, comprising: a local temperature control means that transmits a signal to a controller and operates the local heating means to enable temperature control.