JPH04144714A - Control method of body temperature in autoclave molding - Google Patents

Abstract

PURPOSE:To keep temperature ranges among each molding material within a specified range without exceeding a maximum-temperature set value of the temperatures of the molding materials by controlling an actual gas temperature by specific formula when the temperature of a body is controlled in autoclave molding. CONSTITUTION:When the temperature of a body is controlled in autoclave molding, an actual gas temperature Apv is controlled in conformity with formula I, elevating and lowering speed closer to a maximum-temperature set value Hsp is decelerated slightly without exceeding the maximum-temperature set value Hsp of the temperature Pmax of a molding material, and the temperature is controlled so that temperature ranges among each molding material are kept within a specified range. In formula I, Asp represents the set value of the gas temperature, Hsp the maximum-temperature set value, Pt the mean value of all sensors used, Hsp the variation of the maximum-temperature set value, Pt the variation of the mean value of all sensors used, and PID% any displacement from the maximum-temperature set value Hsp of the maximum temperature Pmax when the maximum temperature Pmax of the molding materials and the maximum-temperature set value Hsp in the means value Pt of all sensors used are compared and a value extends over 0-1, and alpha represents a correction factor, Pmax the maximum temperature of the molding materials, Pmin the minimum temperature of the molding materials and Lsp a minimum-temperature set value.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for heating fiber reinforced plastics (FRP) to be used as structures and components of aircraft, space equipment, industrial equipment, etc., in an autoclave. The present invention relates to a method for controlling the temperature when

[Conventional technology]

Conventionally, when molding fiber-reinforced plastic (FRP) in an autoclave, the technology used to heat the object was as follows:
Empirically based methods are generally used.
A large number of such methods are known, including those described in the No. 2 publication.

These technologies consist of a pressure vessel that houses the molded material (object) and is sealed with a door, and is equipped with a wind tunnel that circulates gas using a blower fan; a heating and cooling means that heats and cools the molded material by using a heater and a cooler installed at the rear inside the pressure vessel to heat and cool the high-pressure gas supplied into the pressure vessel; Cooled gas is blown into the container by a fan installed from a motor sealed at the rear of the pressure vessel, and a gas circulation means is provided so that the cooled gas can be circulated into the wind tunnel through an air passage outside the wind tunnel, and the molded material is sealed. and a pressure reducing means for reducing the pressure inside the vacuum bag to create a high vacuum.

In devices configured in this way, in small autoclaves such as testing machines and small-scale autoclaves, the number of molded materials (objects) stored in the pressure vessel is small, and the molded materials themselves are small and thick. Changes are also small, and therefore, when heat-pressing and curing the adhesive, temperature differences due to wall thickness are also small.
In addition, molding can be performed without causing temperature unevenness due to creeping of parts.

However, in recent years, large autoclaves have been required due to the increasing use of fiber reinforced plastics (FRP) in aircraft structures and their component parts.

In this case, the structures and parts housed inside the pressure vessel are large in size, have complex shapes, and change in wall thickness. As a result, temperature unevenness occurs, leading to variations in adhesion and reliability problems.

Therefore, in general, the best values are determined through experiments based on the properties of the prepreg resin, the structure, the shape of the parts, changes in wall thickness, etc., and then programmed into the controller to set the temperature program. However, during molding, workers monitor the temperature of the molding material and make manual corrections.

[Problem to be solved by the invention]

However, these techniques have the following problems.

(b) For new structures and parts, it is difficult to determine the temperature increase rate due to changes in wall thickness, that is, to set the molding program, so we need to find the molding pattern with the best value each time. Need to experiment.

(b) Moreover, a skilled worker is required for its operation.

(c) Temperature display is also required during molding of structures and parts, but since they are large and have complicated shapes,
Temperatures must be measured and displayed at multiple locations (for example, from about 10 to 30 points in the past, to several tens of points), which has become impossible to monitor with human ability.

(d) Therefore, if the operator is not careful, the actual temperature of the object will exceed the maximum temperature set value created by understanding the characteristics of the object, and as a result, the temperature will exceed the characteristics of the resin. Become. This variation in heating causes quality problems in adhesively cured products. That is, variations occur in the bonding state, and the adhesive cannot be used for structures and parts where reliability is important, such as space equipment and aircraft.

(e) Furthermore, since the molding technology relies on experience, there is limited flexibility in arranging jigs within the pressure vessel, and furthermore, the amount of jigs loaded is limited, which impedes productivity.

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

[Means to solve the problem]

The present invention attempts to control the temperature so that the temperature range between each molded material falls within a specified range by the configuration described in the claims.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

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

As shown in FIGS. 1 to 7, the apparatus for carrying out the present invention is a pressure vessel in which a molded material (object) 1 placed on a jig 9 on a trolley 3 is housed together with the trolley 3 and sealed at 112b. A, a pressurizing means B for supplying high-pressure gas into the pressure vessel A to pressurize the molded material 1, and a heater 5 installed at the rear inside the pressure vessel to supply the high-pressure gas supplied to the pressure vessel A. Heated by cooler 6,
A heating/cooling means C for cooling, a pressure reducing means to reduce the pressure in the vacuum bag 21 for sealing the molded material 1 to a high vacuum, and a gas heated or cooled by the heating/cooling means C into the pressure vessel A. A fan drive device E equipped with a fan 7 for blowing air is provided at the rear inside the container, and the gas to be blown is circulated through a wind tunnel 8 provided along the container A to heat or cool the molded material 1. Gas circulation In the autoclave molding apparatus constituted by means F, a temperature sensor 11 is inserted into a suitable position (including the jig) of the molded material 1, a signal from the temperature sensor is played on a computer 13, and the gas temperature is adjusted according to a set logic. Setting value of Asp
The storage control means G calculates the gas temperature set value and the actual gas temperature Apt in the pressure vessel A, and controls the actual gas temperature Apt by heating within the allowable temperature change amount. The temperature Ptn of the molded materials is brought closer to the maximum temperature set value Hsp without exceeding the maximum temperature set value Hsp.The temperature is adjusted so that the temperature range between each molded material falls within the specified range by slightly decelerating the rising and falling speed. It is configured so that it can be controlled.

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

As shown in FIG. 3, the object 1 control means G controls the molding material 1 at a suitable location (here, the "proper location of the molding material" means the molding material itself, a jig in contact with the molding material, or a jig near the molding material). The temperature Ptn (temperature of all sensors) of the molded material is detected by a temperature sensor 11 such as a thermocouple inserted in the
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, xPID%] X (1-(Pmaz-P
min)/(H3p-Lsp)] The gas temperature set value Asp is calculated according to the logic of
The computer 13 that calculates the gas temperature set value Asp calculated by the computer 13 and the actual gas temperature Apv are compared, and the heater 5 or cooler 6 of the heating/cooling means C shown in FIG. 1 is activated. The actual gas temperature Apv is heated or cooled, and the molding material temperature Ptn is
It is composed of a temperature controller 14 that controls the temperature.

Next, each symbol shown above will be explained.

The actual gas temperature Apv is the temperature of a high-pressure gas such as high-pressure nitrogen gas, high-pressure carbon dioxide gas, high-pressure air, etc., which is supplied into the pressure vessel by the pressurizing means B, and is heated or cooled by the heating and cooling means C.

The gas temperature set value Asp is a value calculated by the logic described above, and is a value that controls the actual gas temperature Avp.

The maximum temperature setting 4flHsp is the maximum allowable temperature value as the properties of the resin part of the prepreg constituting the molding material (object) 1 are heated. Also, during cooling,
It is the lowest permissible temperature value that prevents distortion. The prepreg used here includes, for example, carbon fiber, glass Ij &
B-stage (semi-cured state) is obtained by impregnating a thermosetting resin such as epoxy or polyimide into a woven fabric made of high-strength, high-elasticity fiber such as fiber or aramid fiber, or a unidirectional material. Then, during molding, as shown in FIG. 7, prepreg sheet-like molding materials 1 are laminated along a jig 9, and the adhesive is cured by heating under pressure and temperature of the gas. However, when heated, the thermosetting resin has the characteristic that it changes from a semi-hardened state to a molten state once it reaches a certain temperature (for example, around 120°C), and then hardens when heated further. The maximum temperature (minimum temperature in the case of cooling) is set with respect to time to match the characteristics.

The average value Pt of all the sensors used indicates the average value of all the temperature sensors (thermocouples) 11 inserted at appropriate positions (several tens to hundreds of tens of places) of the molded material 1 on the jig. teeth,
As shown in FIG. 7, a breather 22 (a breather is a breathable heat-resistant glass cloth-like tip) is interposed and a vacuum bag 21 (a vacuum bag is a heat-resistant and flexible The molded material is covered with a film that isolates the molded material from the outside and makes it adhere to the molded material using vacuum pressure.
Sealant 23 (Sealant is a sticky viscous substance that completely seals the molding material against the jig)
and seal it on the jig 9. Then, as shown in FIG. 3, the lead wire of the thermocouple 11 is pulled out from the vacuum bag 21 or the jig 9, and the lead wire of the thermocouple 11 is pulled out from the vacuum bag 21 or the jig 9 and connected to the analog multiplexer.
12 into the computer 13. Then, the computer 13 calculates the average value Pt of all the sensors used.
Calculate.

As shown in FIG. 4, the amount of change ΔHsp in the maximum temperature set value is expressed by the amount of increase ΔTan in the maximum temperature set value with respect to the amount of change Δtn over time, that is, the slope of ΔHs p =ΔTan/Δtn. The amount of change in time Δtn is determined by the system and calculated by the computer 13, and although it depends on the characteristics of the slope, generally when the slope is steep, a smaller value provides better controllability.

As shown in FIG. 4, the amount of change ΔPt in the average value of all sensors used is the amount of increase ΔTbn in the average value of all sensors used with respect to the amount of change Δtn for one hour, that is, ΔPt=ΔTbn/
It is expressed by the slope of Δtn.

ΔHsp/ΔPt is the 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 rate of rise closer to the maximum temperature set value Hsp.

PZD%: This shows how much the maximum temperature Pmar deviates from the maximum temperature setting value Hsp by comparing the maximum temperature PIIIax of the molded material and the maximum temperature setting value Hsp among the average value Pt of all Yansa used. , the value is O~1. Then, when P max matches the set value, it becomes O, and when it deviates, it approaches 1.6 For example, as shown in FIG. 6, when P max is at point a, PID% becomes 0.5. It also serves to prevent the temperature from exceeding the maximum temperature setting value Hsp even if it approaches the maximum temperature setting value Hsp.

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

In addition, Lsp shown in FIG. 4 is the minimum temperature setting value corresponding to the maximum temperature setting value Hsp, and the object (molding material) below this value is the minimum temperature setting value Hsp.
This is the limit temperature at which lowering of the temperature will have an adverse effect on the properties of the molded material, and indicates a warning line.

In addition, PIlliIll is the maximum temperature of the molding material P wa
The average value Pt of all the sensors used at the lowest temperature of the molded material corresponding to x is the average value of the temperatures of multiple sensors including the maximum temperature P Loax and the lowest temperature PIIlin of these molded materials.

(Pmax - Pm1n) is the actual temperature range of the molded material and is also referred to as the maximum temperature difference of the sensor used.

(Hsp - Lsp) is a specified range that indicates the minimum allowable range that does not impair the properties of the resin of the molded material, and is determined by the characteristics of the resin and the shape of the molded material.

And [1-(Pmax-P+n1n)/(Hsp-
Lsp)] plays a role of keeping the temperature range between the molded materials within a specified range, as shown in FIG.

Here, when (Pmax - Pm1n) becomes large, the above logic (1 - (Pmaz - Pmin) / (Hsp
Lsp)] becomes smaller, and the gas temperature set value Asp
becomes smaller. That is, the rate of rise is slow and the molded material temperature difference (Pmax-Pmin) falls within the specified range. Therefore,
Since (Pmax - Pm1n) is smaller than the specified range, the gas temperature set value Asp does not change significantly.X.

Also, instead of (Hsp −Lsp), ΔT(ΔT
is the allowable temperature difference between the molded materials, and using the value given by the properties and characteristics of the resin and the shape of the molded materials,
As shown in FIG. 5, since ΔT is fixed, if the value of ΔT is smaller than ('Hsp - Lsp), the temperature between the molded materials will be lower than when (Hsp - Lsp) is used. Although it has the advantage of being able to be kept smaller, (H
Since the width of the temperature difference is suppressed compared to sp - Lsp), the molding time takes longer.

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 cylindrical thin plate wind tunnel fi8c at a position in front of the heater 5 and cooler 6 and along the inner wall Aa of 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. 7, the jig 9 is formed to match the shape of the molded product, and is used to stack the molded material 1 along the mold. Then, as shown in FIG.
4b and 24a 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 generally supplies high-pressure gas such as high-pressure nitrogen gas, high-pressure carbon dioxide gas, high-pressure air, etc. of about 20 kg/cLll or less into the pressure vessel A using a high-pressure gas supply device 25 using an automatic valve. 26, and the gas is heated or cooled via a heater 5 and a cooler 6. The air is then exhausted via the automatic valve 27. Furthermore, a safety valve 28 is provided to reduce the pressure inside the pressure vessel A when it exceeds a predetermined pressure.

As shown in FIG. 1, the heating and cooling means C includes a heater 5 and a cooler 6 disposed on a second truck 3o 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 FIGS. 1 and 2, the gas circulation means F is a small pressure vessel 36 having a built-in motor 35 in the rear part of the pressure vessel A.
A fan driving mechanism consisting of a fan 7 which is provided in a sealable manner and is fitted and fixed to the shaft of a motor 35 protruding into the rear interior of the pressure vessel A, and a temperature sensor for detecting the temperature of the gas in the small pressure vessel 36. 1 and 2; It is composed of guide vanes 40 that make the gas flow flowing under pressure from the end of the external ventilation passage 8a formed between the pressure vessel inner wall Aa and the wind tunnel wall 8C shown in the figure into a swirling flow.

With this configuration, the direction of the gas flow traveling straight through the outside ventilation passage 8a by the fan 7 is corrected by the guide vanes 40 to become a swirling flow, and the gas is caused to flow out from the end of the outside ventilation passage 8a. Then, it is reversed at Ml 2 c inside the door, and flows into the wind tunnel 8b so as to wrap around the molded material 1 while swirling.

Next, its effect will be explained.

First, as shown in FIGS. 1 and 2, the jig 9 is placed, and then, as shown in FIG. The sensor 11 is inserted, a release film, a breather 22, etc. are placed on it, covered with a vacuum bag 21, completely sealed with a sealant 23, placed on a trolley 3, and carried into a pressure vessel A.

Then, the vacuum joint 24b is connected to the vacuum joint 24a of the piping inside the pressure vessel, and the door 2b is closed to seal the pressure vessel A.

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. is activated to heat the high pressure gas in pressure vessel A. Next, the motor 35 of the fan drive means is operated to rotate the fan 7, and the heated gas is transferred to the inside of the container fiAa and the wind tunnel wall 8C by the fan 7, as shown in FIG.
The air flows straight through the external ventilation passage 8a formed between the air and the air.

Then, the flow direction of the gas is changed by a large number of guide vanes 40, the gas flows out from the end of the external ventilation passage 8a, is reversed at the door inner wall 2C, and the reversed flow flows into the wind tunnel 8b while swirling. The gas is heated or cooled and sucked in via a heater 5 and a cooler 6, and is circulated within the pressure vessel A by a fan 7.

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 Δtn, and the correction coefficient α are programmed is stored.

Next, as shown in FIG. 3, a large number of temperatures are detected by a thermocouple (temperature sensor) 11 inserted into the molded material l.
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. The average value Pt is calculated by calculating the value of .

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, the temperature difference actually occurring (Hsp-Pt
) is multiplied by the rising speed ratio ΔHsp/ΔPt, and further, PID
% by the correction coefficient α, and further, C1-(Pmaz-
By adding the maximum temperature setting value Hsp to the value multiplied by Pm1n)/(Hsp - Lsp)'J, the gas temperature setting value Asp is calculated, and the value of this Asp is transmitted to the temperature controller 14.

Here, the temperature controller 14 compares the value of the gas temperature set value Asp transmitted from the computer 13 with the actual gas temperature Apv in the pressure vessel and operates the heater 5 or cooler 6 of the heating/cooling means. Actual gas temperature Ap
Make v match the set value Asp of the gas temperature.

Then, as shown in FIG. 4, the actual gas temperature Apv is controlled so that the temperature Ptn of the molding material reaches the maximum temperature setting value Hsp.
Temperature control is performed so that the temperature range between each molded material falls within a specified range by slightly decelerating the rising speed so as not to exceed the maximum temperature setting value Hsp and to approach the maximum temperature setting value Hsp.

Further, the temperature of the molded material 1 is further increased in a molding pattern as shown in FIG. 4, and once it reaches a specified temperature, that temperature is maintained for a while to bond and harden the molded material 1.

Next, the cooler 6 shown in FIG. 1 is operated to cool the heated high-pressure gas, and as described above, the cooled high-pressure gas is blown by the fan 7 from the outside ventilation passage 8a to the guide vane 40 to the inside of the door! ! 20 to the pressure vessel A through the wind tunnel 8b to cool the molded material 1. Even during this cooling, the actual gas temperature Apv is controlled as shown in FIG. 4 according to the logic described above. 5. Temperature control is performed so that the temperature Ptn of the molded materials does not exceed the maximum temperature set value Hsp, and the drop that approaches the maximum temperature set value Hsp is slightly decelerated so that the temperature range between each molded material falls within the specified range. , the molded material 1 is cooled uniformly.

Simultaneously with this cooling, or in accordance with the progress of cooling, the pressure inside the pressure vessel A is gradually lowered. When the pressure is released and the molding material 1 is cooled, all operations are stopped, 1i2b is opened, and the molding material 1 is carried out to complete one process.

〔Effect of the invention〕

As described above, according to the present invention, the following effects are achieved.

Since the present invention is configured as described above, it is no longer necessary to experiment each time a new structure or part is created, and since it is controlled by a computer, it can be operated by a skilled person. This eliminates the need for additional workers.

In addition, as machines have become larger and have more complex shapes, they automatically measure and display temperatures at multiple points (temperatures at dozens of strokes), so workers no longer need to monitor the temperature. , the burden on workers can be reduced.

In addition, even if the worker is not careful, the actual temperature of the object is controlled by constantly detecting the temperature rise gradient of the object, so the temperature of the molded material created by understanding the characteristics will be constant. Since the temperature can be controlled so that the temperature range between each molded material is within the specified range by slightly decreasing the rising and falling speed that approaches the maximum temperature setting value without exceeding the maximum temperature setting value, the heating and The variation in cooling is extremely small, and the adhesive can be cured uniformly, making it ideal for structures and parts where reliability is important, such as space equipment and aircraft.

Furthermore, since the temperature is controlled so that the temperature range between each molding material is within the specified range, the variation in moldability of each molding material is greatly reduced, so there is no need to rely on experience, and it is possible to As the arrangement of the containers expands, the amount of loading can be changed more freely, and combined with high quality, productivity can be expected to improve.

[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. 3 is a schematic front view of the device according to the present invention. FIG. 4 is a block diagram showing the configuration of the present invention.
A graph of one example showing a molding pattern of temperature/pressure characteristics, FIG. 5 is a graph showing a part of a molding pattern to explain the allowable temperature difference between molding materials, and FIG. 6 is a graph for determining the value of PID%. FIG. 7 is a sectional view showing an embodiment in which the molded material is stacked on a jig, a temperature sensor is inserted, and the material is sealed in a vacuum bag. Asp: Gas temperature set value, Hsp: Maximum temperature set value (minimum temperature set value in case of cooling) Lsp: Minimum temperature set value (highest temperature set value in case of cooling) Pt: Average value of all sensors used, ΔHsp : Amount of change in the maximum temperature set value ΔPt: Amount of change in the average value of all sensors used PID%: Indicates how much the maximum temperature Pmax of the molded material deviates from the maximum temperature set value Hsp Pmax: Maximum temperature of the molded material , Pm1n: Minimum temperature of molding material, Apv: Actual gas temperature, Ptn: Temperature of molding material, Δtn: Amount of change over time, ΔTan: Amount of increase in maximum temperature set value, ΔTbn: Average value of all seven sensors used. Amount of increase, ΔT: Allowable temperature difference between molded materials, A: Pressure vessel, Aa: Inner wall of pressure vessel, B: Pressurizing means, C: Heating and cooling means, D2 pressure reducing means,
E: Fan drive device, F: Gas circulation means, G: Storage control means, H: Temperature detection means, I: Fan drive means,
J: Motor cooling means, 1: Molded material, 2a: Main container, 2b: Door, 2C: Door inner wall, 3: Dolly, 4: Rail, 5: Heater 6: Cooler, 7: Fan, 8 Two wind tunnels, 8a: Outside ventilation path, 8b = inside the wind tunnel, 8c: wind tunnel wall, 9: jig, 11: temperature sensor (thermocouple) 12: analog multiplexer 13: computer, 14: temperature controller, 21: vacuum bag, 22: Breather-23 Nizi-Rant, 24
a, 24b: Vacuum joint, 25: High pressure gas supply device, 26.27: Automatic valve, 28: Safety valve, 29: Automatic valve, 30: Second trolley, 31: Automatic valve, 32
．． Vacuum pump, 33, automatic valve, 35: motor,
36: Small pressure vessel, 37: Temperature detector, 38: Automatic valve, 40: Guide vane. Figure 2 Figure Figure 6 Figure 6

Claims (1)

[Claims] 1. When controlling the temperature of an object in autoclave molding, the following logic is used: Asp=Hsp+[(Hsp-@Pt@)×ΔHsp/
Δ@Pt@×PID%]×α×[1-(Pmax-Pm
in)/(Hsp-Lsp)] Here, Asp: Set value for gas 1 degree Hsp: Maximum temperature set value (minimum temperature set value in case of cooling) @Pt@: Average value of all sensors used ΔHsp: Maximum temperature Amount of change in set value Δ@Pt@: Amount of change in average value of all sensors used PID%
: It 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 to 1 α: Correction coefficient, obtained from experiments, and its value is generally 1 to 5. is the maximum temperature setting value) The actual gas temperature Apv is controlled according to the formula, and the rising/falling speed is set so that the temperature Pmax of the molding material does not exceed the maximum temperature setting value Hsp and is brought closer to the maximum temperature setting value Hsp. A temperature control method in autoclave molding, characterized by controlling the temperature by slightly decelerating so that the temperature range between each molding material falls within a specified range. 2. When controlling the temperature of an object in autoclave molding, the following logic is used: Asp=Hsp+[(Hsp-@Pt@)×ΔHsp/
Δ@Pt@×PID%]×α×[1-(Pmax-Pm
in)/ΔT] Here, Asp: Set value of gas temperature Hsp: Maximum temperature set value (minimum temperature set value in case of cooling) @Pt@: Average value of all sensors used ΔHsp: Amount of change in maximum temperature set value Δ@Pt@: Change amount PID% of average value of all sensors used
: Compares the maximum temperature Pmax of the molded material and the maximum temperature set value Hsp among the average value @Pt@ of all the sensors used, and shows how much Pmax deviates from the maximum temperature set value Hsp by a maximum of 1 degree. , the value is 0 to 1 α: Correction coefficient, obtained from experiments, and its value is generally 1 to 5 Pmax: Maximum temperature of molding material Pmin: Minimum temperature of molding material ΔT: Allowable temperature difference of molding material The actual gas temperature Apv is controlled according to the formula, and the temperature Pmax of the molding material does not exceed the maximum temperature setting value Hsp and is brought closer to the maximum temperature setting value Hsp by 1 degree. A method for controlling temperature in autoclave molding, which is characterized by controlling the temperature so that the temperature range between materials falls within a specified range.