JP2019188770A - Resin or resin composite material heater and method - Google Patents

Abstract

To provide a heater of a resin or resin composite material and a heating method thereof, using an electromagnetic wave with good absorption in at least one of the resin and the resin composite material and capable of uniform heating of at least one of the resin and the resin composite material.SOLUTION: The heater 1 is equipped with a lower infrared heater 44 and an upper infrared heater 64 having an exothermic temperature of 1450°C or above and 1650°C or under, and a stage 6 for supporting a molding material W which is a heating object at a position where an infrared ray from the lower infrared heater 44 and the upper infrared heater 64 is irradiated. The lower infrared heater 44 and the upper infrared heater 64 include a carbon heater having carbon filaments. The lower infrared heater 44 and the upper infrared heater 64 are provided at the upper the lower positions of the molding material W.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heating device that heats at least one of a resin and a resin composite material, and a heating method that can be performed in the heating device.

As described in Japanese Patent Application Laid-Open No. 2011-208039 (Patent Document 1), before a laminated molding material obtained by cutting and laminating a molding raw material having a resin material attached to a reinforcing fiber bundle is stored in a molding die A forming method in which preheating is performed with a preheating mold is known.
In the preheating of this forming method, the laminated molding material arranged on the heating plate in the preheating mold is heated with the near infrared ray emitted from the near infrared radiation device, and the temperature of the laminated molding material is measured with the far infrared temperature sensor. Is detected, the intensity of near infrared rays is adjusted, and the temperature of the laminated molding material is raised to a predetermined temperature.

JP 2011-208039 A

In the preheating, the laminated molding material is heated with near infrared rays from a near infrared radiation device. Generally, a halogen heater having a relatively large output is used as the near infrared radiation device. The heat generation temperature (filament temperature) of the halogen heater is about 1660 ° C. or more and 3350 ° C. or less, and the wavelength of the near infrared ray to be emitted is about 0.8 μm (micrometer) or more and 1.5 μm or less. In heating a resin material using such near infrared rays, there is room for improvement in the absorption of infrared rays with respect to the resin, and the heating efficiency is low. Further, the temperature is too high for the resin, and the surface of the resin may be burnt or voids may be generated inside the resin.
In addition, when the heating rate is high, such as a high-power halogen heater, the heater output intensity is adjusted based on the temperature of the laminated molding material detected by the far-infrared temperature sensor and the laminated molding material is heated to a predetermined temperature. In addition, the temperature may go too high to be controlled to a predetermined temperature, and the stray light from the near-infrared radiation device may cause an error in the far-infrared temperature sensor and affect the control.

Therefore, the main object of the present invention is to use electromagnetic waves that have good absorption with respect to at least one of the resin and the resin composite material, and at least one of the resin and the resin composite material is heated uniformly in the surface direction and the thickness direction. It is to provide a heating device and a heating method for a resin or a resin composite material.
Another main object of the present invention is to provide a heating apparatus and a heating method for a resin or a resin composite material in which heating is accurately controlled even when heating is performed for a relatively short time.

The invention according to claim 1 is the resin or resin composite material heating apparatus, wherein at least one of an infrared heater having an exothermic temperature of 1450 ° C. or higher and 1650 ° C. or lower and a resin or resin composite material to be heated is used as the infrared heater. Heating target support means for supporting at a position where the infrared rays from are irradiated.
According to a second aspect of the present invention, in the above invention, the infrared heater includes a carbon heater having a carbon filament.
The invention according to claim 3 is the above invention, wherein the infrared heaters are provided above and below the heating target.
The invention according to claim 4 is characterized in that, in the above invention, the heating object supporting means is made of carbon.
According to a fifth aspect of the present invention, in the above invention, the heating object support means carries out the heating object from the carrying-in position where the heating object is carried to the carrying-out position where the infrared ray is irradiated to the carrying-out position where the heating object is carried out. It is possible to move to a position.
The invention described in claim 6 is characterized in that, in the above-mentioned invention, a reflection means for reflecting the infrared ray to the side to be heated is further provided.
The invention according to claim 7 further comprises control means for adjusting the output of the infrared heater in the above-mentioned invention, wherein the control means is configured to set the ratio of the output of the infrared heater to the maximum output and the ratio. The output of the infrared heater is adjusted based on a heater stage output setting pattern table that is associated with the time for which the output is continued.
The invention according to claim 8 is the resin or resin composite material heating method, wherein in the infrared ray emitted from the infrared heater having an exothermic temperature of 1450 ° C. or higher and 1650 ° C. or lower, at least one of the resin to be heated and the resin composite material It is characterized by irradiating.
The invention according to claim 9 is characterized in that, in the above-mentioned invention, the output of the infrared heater is reduced with the passage of a predetermined time after the start of heating, compared to the output of the heating object at the start of heating. is there.

The main effect of the present invention is that an electromagnetic wave having good absorption with respect to at least one of a resin and a resin composite material is used, and at least one of the resin and the resin composite material is heated uniformly in the surface direction and the thickness direction or A heating device and a heating method for a resin composite material are provided.
Another main effect of the present invention is to provide a heating apparatus and a heating method for a resin or a resin composite material in which heating is accurately controlled even when heating is performed for a relatively short time.

It is a center longitudinal cross-sectional view of the heating apparatus which concerns on this invention. It is a top view of the lower part of the heating apparatus which concerns on this invention. It is a bottom view of the upper part of the heating device concerning the present invention. It is the graph by which the relationship between the radiation wavelength for every predetermined heat_generation | fever temperature in a carbon heater or a halogen heater, and relative spectral radiation divergence was shown. It is the graph by which the relationship between the wavelength (micrometer, horizontal axis) of the absorbed radiation and absorptance (%, vertical axis) concerning a polycarbonate was shown. 6 is a graph showing the relationship between the filament temperature of the infrared heater (heat generation temperature, ° C., horizontal axis) and the heating time (seconds, vertical axis) of the polycarbonate-containing molding material (sample) until it reaches 300 ° C. from room temperature. It is a flowchart regarding the example of operation | movement of the heating apparatus which concerns on this invention, and the example of a heating method. (A) is the surface temperature (° C., vertical scale on the vertical axis) and internal temperature (center in the thickness direction, ° C., vertical scale on the vertical axis) of another sample of the molding material according to the operation example of the present invention, and heater output ( %, Vertical scale (right scale) is a graph showing the change over time (horizontal axis, second) from the start of heating to 10 seconds later, (b) is the case where the heater output is maintained at 100%, It is a graph similar to Fig.7 (a). It is a cross-sectional microscope picture of the sample heated for 4 seconds with heater output 30%, after heating for 8 seconds with heater output 100%. It is a cross-sectional microscope picture of the sample heated for 8 seconds with the heater output of 100%. It is a graph by which the time-dependent change of the temperature of another sample in various heater outputs is shown.

Hereinafter, an example of an embodiment according to the present invention will be described based on the drawings as appropriate together with the modified example.
In addition, the said form is not limited to the following example and modification.

FIG. 1 is a central longitudinal sectional view of a heating apparatus 1 according to the present invention. FIG. 2 is a top view of the lower portion of the heating device 1. FIG. 3 is a bottom view of the upper portion of the heating device 1. In FIG. 1, the top is the top of the heating device 1, and the left is the front of the heating device 1. Further, the left in FIG. 2 is the front of the heating device 1, and the lower is the left of the heating device 1. The direction of the heating device 1 is determined for convenience of explanation, and may change depending on the movement and installation conditions of various members or parts.
The heating device 1 is a plate-shaped molding raw material in which a resin (polycarbonate, PC) is attached to a carbon fiber bundle or a plate-shaped laminated molding material in which a plurality of these are laminated (hereinafter collectively referred to as a molding material W), Before molding into carbon fiber reinforced resin, that is, Carbon Fiber Reinforced Plastics (CFRP) molded product, it is preheated. The molding material W is a resin composite material in which a carbon fiber bundle is combined with a resin. In addition, the fiber which concerns on reinforcement is not restricted to a carbon fiber, Other reinforcement fibers including glass fiber (Glassfiber) may be used (FRP). In addition, the resin in the resin composite material may be a thermoplastic resin such as polyamide or polypropylene (Fiber Reinforced Thermoplastics, FRTP), and may not contain reinforcing fibers. Further, the molding material W as a heating target may not be in a plate shape such as being preformed, and the heating by the heating device 1 may be performed at the time of molding the molding material W after the preheating or the molding material W to be molded. May be made at other stages, such as during molding in the case of an intermediate material such as a prepreg (a sheet or plate made by impregnating a fiber with a resin). The heating target may be a resin composite material other than a resin composite material in which fiber bundles are combined, a resin alone (including a combination of a plurality of types of resins), a resin and a resin composite material A combination may be used. Even when the heating target is a resin alone, any kind of resin may be used. At least one of the resin to be heated and the resin composite material may not be molded.

  The heating device 1 includes a lower housing 2, an upper housing 4, a stage 6, a stage moving unit 8, a lower heater unit 10, an upper heater unit 12, and control means (not shown) for controlling various members. It is equipped with.

The lower housing 2 has a box shape opened upward, and holds the lower heater portion 10. The lower housing 2 is installed on an installation surface such as a floor surface via legs (not shown).
The upper housing 4 has a box shape opened downward, and holds the upper heater portion 12. The upper housing 4 is installed above the lower housing 2 with a predetermined distance from the lower housing 2 via an installation surface or a leg (not shown) reaching the lower housing 2. The lower housing 2 and the upper housing 4 are not separated, and may be an integral housing.
A plate-shaped heat insulating material 18 is provided above the lower surface in the lower housing 2 and below the upper surface in the upper housing 4. It should be noted that at least one of the heat insulating materials 18 may be omitted, or the heat insulating material 18 may be disposed in other portions including the outer surface of the lower housing 2.

The stage 6 can be disposed between the lower housing 2 and the upper housing 4 (heating position). The stage 6 is made of carbon (graphite), and has a rectangular frame-shaped frame portion 20 as viewed from above, and left and right plate-shaped support portions 22 extending outward from the left and right central portions. The frame portion 20 is provided with a plurality of projections 24 (6 in total, two each in the front and rear and one each on the left and right) protruding inward relative to the other portions. The stage 6 mounts a molding material W to be heated. More specifically, the edge of the plate-shaped molding material W is supported by the tip portions of the projections 24, and most of the molding material W is within the frame portion 20. Support to be exposed at. The stage 6 at the heating position supports the molding material W so that infrared rays from the lower heater unit 10 and the upper heater unit 12 are irradiated (heating target support means). The stage 6 has a frame portion 20 having a polygonal shape or a circular shape, a support portion 22 having a frame shape, and the number of protrusions 24 is five or five including a total of six to zero (omitted). The number of protrusions 24 may be reduced to the following or increased to 7 or more, or the protrusion 24 may be arranged only at the center of each side of the frame 20 or may be omitted at some of the sides. On the other hand, the frame part 20 may be changed in various ways, such as being exchangeable so as to match the size or shape of the heating target. In order to prevent the heating of the molding material W by the lower heater part 10 as much as possible while supporting the molding material W, it is preferable that the protrusions 24 have a minimum number so that the molding material W does not bend. Instead of the stage 6, the heating target support means may be of other types such as a chuck that holds the molding material W and holds it in the heating position.
The stage moving unit 8 includes a pair of left and right rails 30 provided outside the lower housing 2 so as to extend in the front-rear direction, and an arm (not shown) connected to the support unit 22 of the stage 6. Each support portion 22 is placed on the rail 30 so as to be able to travel on the corresponding rail 30. The arm moves the stage 6 back and forth via the support portion 22. The stage 6 can be moved from a position exiting from the heating position (pre-heating molding material loading position) to a position exiting forward from the heating position (post-heating molding material unloading position) through the heating position. The rails 30 may be one or more than three, may be omitted, or may be arranged at other positions. Further, at least one of a ball screw and a chain may be provided instead of or together with the arm.

The lower heater unit 10 includes a lower infrared heater unit 40 and a lower reflection unit 42.
The lower infrared heater unit 40 is formed by arranging a plurality of lower infrared heaters 44 extending left and right. The lower infrared heater 44 may extend in the front-rear direction, and the number of the lower infrared heaters 44 can be increased or decreased from that illustrated.

Each lower infrared heater 44 is a planar carbon heater in which carbon fiber (carbon), which is a conductive material, is used as a material for a heating element (filament). A power supply (not shown) is connected to each lower infrared heater 44. Heat generation by the power of each lower infrared heater 44 is controlled by the control means.
The carbon heater has a characteristic that a lot of energy is radiated to the mid-infrared region as compared with a halogen heater using a halogen lamp.
In addition, the halogen heater is a quartz tube in which halogen gas is sealed and linear tungsten is passed, and infrared rays are radiated uniformly over the entire circumference of the quartz tube. On the other hand, a planar carbon heater is obtained by passing a planar carbon fiber into a quartz tube filled with an inert gas, and infrared rays are centered on a direction perpendicular to the plane from a pair of planes in the carbon fiber. Radiated and hardly radiated directly in the direction tilted about 30 ° or more from the vertical direction. Each lower infrared heater 44 is provided in a posture in which planar carbon fibers are horizontal, and infrared rays are radiated centering on the top and bottom.

Each lower infrared heater 44 has a heat generation temperature (filament temperature during heat generation) of 1450 ° C. or higher and 1650 ° C. or lower, more preferably 1650 ° C.
FIG. 4 shows the radiation wavelength (μm, horizontal axis) and the relative spectral radiant divergence corresponding to the spectral energy density (× 10 ³ / m ² · μm, vertical axis) for each carbon heater or halogen heater. The relationship is shown.
At 2300 ° C. related to the halogen heater (tungsten), the energy density peak is located at a wavelength of about 1.1 μm, and at 2000 ° C. related to the halogen heater (tungsten), the energy density peak is located at a wavelength of about 1.3 μm. is doing.
On the other hand, at 1650 ° C. related to the carbon heater (carbon), the energy density peak is located at a wavelength of about 1.5 μm (more specifically, 1.51 μm). Also, the distribution of spectral energy density (relative spectral radiant divergence) at 1450 ° C. (not shown) is such that it follows the exact center between 1650 ° C. and 1250 ° C., and the peak of the energy density is located at a wavelength of about 1.7 μm. ing.
Furthermore, at 1250 ° C. related to the carbon heater (carbon), the energy density peak is located at a wavelength of about 1.9 μm, and at 1050 ° C. related to the carbon heater (carbon), the energy density peak is about 2.2 μm in wavelength. Is located.
Therefore, each lower infrared heater 44 emits the most infrared rays (wavelength 1.5 μm or more) longer than near infrared rays (wavelength 0.8 μm or more and less than 1.5 μm), and 1.5 μm or more and 1.7 μm or less. It has an energy density peak in the wavelength region.
Each of the lower infrared heaters 44 may be a heater related to another heating element such as a halogen heater as long as the heat generation temperature is 1450 ° C. or higher and 1650 ° C. or lower.

FIG. 5 shows the relationship between the wavelength of absorbed radiation (μm, horizontal axis) and the absorption rate (%, vertical axis) according to PC.
In the wavelength region of 2 μm or less, the PC has an absorption band having a relatively large absorption rate in the region of 1.51 μm or more and 1.79 μm or less (portion surrounded by a dotted rectangle in FIG. 5). In the vicinity of the wavelength of 1.51 μm, as described above, a region having a peak of the energy density of the heating element related to a heating temperature of 1450 ° C. or more and 1650 ° C. or less (particularly 1650 ° C.) is located. Such a wavelength matches the region of the energy density distribution of each lower infrared heater 44. More specifically, the absorption peak in the absorption band exists at 1.67 μm, and the heating temperature of the heating element having the energy density peak at 1.67 μm is 1450 ° C. Also, the shorter the wavelength, the greater the energy, and the energy density increases if the energy density peak is shorter than 1.67 μm. The wavelength is shortened as much as possible within the absorption band while taking into account the PC absorptivity. Thus, the heating can be efficiently performed, and the heating temperature of the heating element according to such a wavelength (1.51 μm) is 1650 ° C.
As shown in FIG. 6, the molding material W containing PC is efficiently heated by the lower infrared heater 44 (carbon heater) having a region having an energy density distribution peak matched to the absorption band of PC. . That is, the heating time until the PC-containing molding material W (sample of a predetermined size) reaches a predetermined temperature (300 ° C.) is the shortest when the filament temperature (exothermic temperature) is 1650 ° C. (28 seconds), It is about half or shorter than other filament temperatures (1050 ° C., 1250 ° C., 2000 ° C., 2300 ° C.).
In other resins such as polyamide and polypropylene, an absorption band having a relatively large absorption rate is located in the vicinity of 1.5 μm in the wavelength region of 2 μm or less, like PC. In addition, there is no realistic heating element that has an energy density peak in a region exceeding 2 μm and has an absolute value of energy density that can sufficiently heat the resin. Furthermore, the absorptance distribution in the wavelength region of less than 0.5 μm in FIG. 5 (the portion that suddenly drops from about 90% to 0%) shows a measurement error.

  The lower reflection unit 42 is formed by arranging a plurality of lower reflection tubes 46 as one of reflection means in which an infrared reflector is housed in a tubular case, extending in the left-right direction. The lower reflection unit 42 is disposed on the lower side of the lower infrared heater unit 40 and reflects the electromagnetic waves radiated downward from the lower infrared heater unit 40 upward. The lower reflecting tube 46 may extend in the front-rear direction, and the number of the lower reflecting tubes 46 can be increased or decreased from that shown in the figure. Further, the lower reflecting tube 46 may be arranged in a different direction from the lower infrared heater 44. Furthermore, the lower reflection unit 42 may include other reflectors including a series of reflectors, and the case of the reflector may be formed in a shape other than a tube or may be omitted.

The upper heater unit 12 includes an upper infrared heater unit 60 and an upper reflection unit 62. The upper heater portion 12 is formed in the same manner as the lower heater portion 10, and more specifically, is formed symmetrically with respect to the lower heater portion 10 and the heating position. In addition, the upper heater part 12 has the same modified example as the lower heater part 10 suitably.
The upper infrared heater unit 60 includes an upper infrared heater 64 that is formed and arranged in the same manner as the lower infrared heater 44. Each upper infrared heater 64 may be arranged in a different direction from each lower infrared heater 44. For example, the upper infrared heater 64 is arranged so as to face the front-rear direction, and the lower infrared heater 44 faces the left-right direction. It may be arranged.
The upper reflecting unit 62 includes an upper reflecting tube 66 as another one of reflecting means, which is formed and arranged in the same manner as the lower reflecting tube 46. Each upper reflecting tube 66 may be arranged in a different direction from each lower reflecting tube 46.
Further, the upper heater unit 12 (upper infrared heater unit 60) and the lower heater unit 10 (lower infrared heater unit 40) may be omitted in one of them or may have different configurations. . Further, infrared heaters may be arranged on the left and right of the molding material W. Even in this case, the infrared heaters are arranged so as to face each other and are arranged on both sides with the molding material W interposed therebetween. W is heated more uniformly.

The control means includes a computer with information processing means (CPU), storage means (for example, memory card), and input means (for example, keyboard).
The storage means can store various types of information, and the heater stage output setting pattern table shown below is stored. The heater stage output setting pattern table includes a number (number of stages), a ratio of the output in the upper infrared heater unit 60 to the maximum output (upper heater output,%), and a similar ratio in the lower infrared heater unit 40 (lower heater output, %) And the time (seconds) for continuing the combination of these output ratios are associated with each other. The number is a natural number, and there are two levels in the following. Further, in the next heater stage output setting pattern table, the upper heater output and the lower heater output are aligned at each stage number.
The input means receives user input.
The control means may be a control panel or the like installed together with the computer instead of the computer. The control means may be provided in a distributed manner among a plurality of members or parts. Further, the input unit may be omitted, or a display unit capable of displaying various information may be added. In addition, the heater stage output setting pattern table may have three or more stages, or the upper heater output and the lower heater output may be different in at least some stages.

Hereinafter, an example of the operation of the heating apparatus 1 and an example of the heating method performed by the heating apparatus 1 will be mainly described with reference to FIG.
The operation of the heating device 1 is started based on the input of the preheat treatment start by the user via the input means to the control means.
When the molding material W is loaded into the stage 6 at the pre-heating molding material loading position by the user or the robot hand, the control unit issues a movement command to the stage moving unit 8 and moves the stage 6 to move the molding material W. Is conveyed to the heating position (step S1).

When the control means grasps the arrival of the molding material W at the heating position, it refers to the heater stage output setting pattern table, and drives the lower infrared heater unit 40 and the upper infrared heater unit 60 according to this. Here, first, the lower infrared heater unit 40 and the upper infrared heater unit 60 are both driven at 100% output for 8.0 seconds (step S2 relating to the number of stages “1” in the heater stage output setting pattern table), Next, both the lower infrared heater unit 40 and the upper infrared heater unit 60 are driven for 4.0 seconds with an output of 30% (output reduction step S3 related to the stage number “2” in the heater stage output setting pattern table).
The molding material W is heated (preheating before molding) by driving the lower infrared heater unit 40 and the upper infrared heater unit 60.

FIG. 8A shows a lower infrared heater unit 40 according to the heater stage output setting pattern table and a sample of the molding material W (thickness 1.5 mm) which is different from the sample of FIG. Surface temperature (° C, vertical scale on the vertical axis) and internal temperature (center in the thickness direction, ° C, vertical scale on the vertical axis) of the molding material W when heated by the upper infrared heater unit 60, and below A time-dependent change (horizontal axis, second) from the start of heating of the outputs (heater output,%, vertical scale on the vertical axis) of the infrared heater unit 40 and the upper infrared heater unit 60 from the start of heating is shown. On the other hand, FIG. 8B shows a change with time similar to FIG. 8A when the heater output is maintained at 100%.
In order to soften the molding material W (PC), the temperature of the molding material W needs to be 280 ° C. or higher. Since the heating of the molding material W is performed by infrared irradiation from the outside of the molding material W, the internal temperature rises behind the surface temperature. From the viewpoint of fast heating of the molding material W and reaching of the internal temperature above the required temperature, a larger heater output is preferable. On the other hand, if the heater output is too large or the surface temperature rises too much, the surface of the molding material W is burnt, and if only the surface temperature is high and the internal temperature is low, voids (voids) are generated inside the molding material W. Resulting in.
Therefore, as shown in FIG. 8A, if the heater output is decreased after the elapsed time when the surface temperature of the molding material W reaches the required temperature or the time adjacent to the elapsed time, the surface temperature of the molding material W is reduced. The internal temperature of the molding material W can reach the required temperature while maintaining the required temperature (suppressing the rise of the surface temperature from the required temperature to an appropriate degree or less). That is, due to such a decrease in the heater output, heat penetration into the molding material W is achieved in a state in which overheating of the surface of the molding material W is prevented. Therefore, the surface of the molding material W is prevented from being burnt and the generation of internal voids (see FIG. 9 relating to a cross-sectional micrograph of a sample heated at a heater output of 100% for 8 seconds and then heated at a heater output of 30% for 4 seconds).
On the other hand, as shown in FIG. 8B, if there is no stage of lowering the heater output, the surface temperature of the molding material W continues to rise, and when the internal temperature of the molding material W reaches the required temperature, It is much higher than the internal temperature. Therefore, the possibility of burning of the surface of the molding material W and generation of internal voids is relatively increased (see FIG. 10 relating to a cross-sectional micrograph of a sample heated for 8 seconds at a heater output of 100%). In FIG. 10, depressions due to temperature non-uniformity are generated in the arrow portions (four locations) on the upper side of the cross section (surface fiber crimp portion) of the molding material W, and the black portion inside the cross section of the molding material W is formed. A void has occurred.

In addition, the heater output at the stage where the heater output is reduced is appropriately determined as follows, for example.
As shown in FIG. 11, for each of the other samples of the molding material W, the heater output of 15%, 20%, 25%, and 30% is maintained from the beginning so that the heating is performed. The temperature change of each sample is measured.
With the heater output of 15% and 20%, the sample temperature does not reach the required temperature of 280 ° C even after 1000 seconds, and the heater output of 15% and 20% maintains the surface temperature and increases the internal temperature. Is lacking in terms of
With the heater output of 25%, the sample temperature reaches the required temperature in about 400 seconds, and the heater output of 25% is not deficient in view of maintaining the surface temperature and increasing the internal temperature.
With a heater output of 30%, the sample temperature reaches the required temperature in about 200 seconds, and the heater output of 30% is not insufficient in terms of maintaining the surface temperature and increasing the internal temperature, and the heater output of 25% The internal temperature can be increased in a shorter time compared to.
Similarly, although not shown in FIG. 11, the case of 40% heater output was measured, and the sample temperature reached the required temperature in about 23 seconds. Such a heater output of 40% is sufficient from the viewpoint of an increase in internal temperature, but the possibility of scorching and voids in the molding material W becomes relatively high.
The heater output at the stage of lowering the heater output in the heating device 1 is preferably 25% or more and 35% or less in view of maintaining the surface temperature and increasing the internal temperature, and preventing burning and voids. Preferably it is 30%.
Even in the case of other resins and other types of infrared heaters, only the necessary temperature and the value of the temperature reached to that temperature change, and the above-described operation or control is appropriate. Further, the stage of lowering the heater output may be divided into a plurality of stages, for example, 35% (2 seconds) and 25% (2 seconds), or 25% (1 second) and 35% (3 Second), 35% (2 seconds), 30% (1 second), and 25% (2 seconds).

When 12.0 seconds have elapsed from the start of heating and the heating of the molding material W has been completed, the control means stops driving the lower infrared heater unit 40 and the upper infrared heater unit 60 and also instructs the stage moving unit 8 to move. And the stage 6 is moved to convey the molding material W to the molding material unloading position after heating (step S4). The heating time may be adjusted by taking the stage 6 into and out of the heating position without stopping the driving of the lower infrared heater unit 40 and the upper infrared heater unit 60. In this case, the lowered heater output is returned to 100% by the start of heating of the next molding material W.
The molding material W conveyed to the molding material unloading position after heating is unloaded by the user or a robot hand and used for molding after preheating.
When the control means grasps that the next molding material W is heated by a user input or a sensor, the control means issues a movement command to the stage moving unit 8 and returns the stage 6 to the pre-heating molding material loading position.

Such a heating apparatus 1 has the following effects.
That is, the heating device 1 uses the lower infrared heater 44 and the upper infrared heater 64 that have a heat generation temperature of 1450 ° C. or higher and 1650 ° C. or lower, and the molding material W to be heated as infrared rays from the lower infrared heater 44 and the upper infrared heater 64. And a stage 6 that supports at a position where the light is irradiated. Therefore, there is provided a heating device 1 that uses infrared rays (with an energy density peak of about 1.51 μm) with good absorption with respect to the molding material W (absorption rate peak of about 1.51 μm) and uniformly heats the molding material W. Is done.
The lower infrared heater 44 and the upper infrared heater 64 include a carbon heater having a carbon filament. Therefore, infrared rays having good absorption with respect to the molding material W can be more easily generated. Further, infrared rays are efficiently emitted from the molding material W side.
Further, the lower infrared heater 44 and the upper infrared heater 64 are provided above and below the molding material W. Therefore, the molding material W is heated more uniformly.

In addition, the stage 6 is made of carbon. Therefore, the heating target support means having high heat resistance and light weight is formed.
Further, the stage 6 can move the molding material W from the pre-heating molding material loading position to the post-heating molding material unloading position through the heating position where infrared rays are irradiated. Therefore, heating of the molding material W is performed in a short time in an easily repeated state.
Further, the heating device 1 includes a lower reflecting tube 46 and an upper reflecting tube 66 that reflect infrared rays toward the molding material W side. Therefore, heating of the molding material W is performed more efficiently regardless of the addition of the lower infrared heater 44 or the upper infrared heater 64.

Furthermore, the heating device 1 includes control means for adjusting the outputs of the lower infrared heater 44 and the upper infrared heater 64, and the control means includes a ratio of the output of the lower infrared heater 44 and the upper infrared heater 64 to the maximum output. The outputs of the lower infrared heater 44 and the upper infrared heater 64 are adjusted based on the heater stage output setting pattern table associated with the duration of the output related to the ratio.
Therefore, even if the heating time is short, appropriate control can be performed so that the surface of the molding material W can be burnt and internal voids can be prevented.
That is, when the near-infrared intensity is adjusted based on the temperature of the laminated molding material detected by the far-infrared temperature sensor as in the past, the heating time of about 12 seconds and the required temperature (about 280 ° C.) of the molding material W are achieved. At a heating rate that corresponds to the temperature rise, there is not enough time to process the temperature of the laminated molded material and switch the intensity of near infrared rays. Further, the stray light from the near-infrared radiation device may cause an error of the far-infrared temperature sensor, which may affect the control.
On the other hand, in the heating device 1, since the outputs of the lower infrared heater 44 and the upper infrared heater 64 are switched in the order of each predetermined stage based on the heater stage output setting pattern table, at such a heating rate. Even if it exists, since the output of the lower infrared heater 44 and the upper infrared heater 64 is switched quickly and appropriately and the sensor is not used, an error caused by the sensor does not occur. Therefore, it is possible to perform appropriate control that can prevent the surface of the molding material W from being burnt and prevent internal voids.

Moreover, the heating method which can be performed by the heating apparatus 1 has the following effects.
That is, in the heating method, the infrared rays emitted from the lower infrared heater 44 and the upper infrared heater 64 whose heat generation temperature is 1450 ° C. or higher and 1650 ° C. or lower are irradiated to the molding material W to be heated. Therefore, there is provided a heating method in which infrared rays having good absorption with respect to the molding material W (absorption rate peak of about 1.51 μm) (energy density peak of about 1.51 μm) are used, and the molding material W is uniformly heated. The
Further, in the heating method, the output of the lower infrared heater 44 and the upper infrared heater 64 is set to a predetermined time (8 seconds) after the heating is started (step S2) with respect to the output (100%) when the molding material W is started to be heated. Decrease over time (30%, output reduction step S3). Therefore, while suppressing an excessive increase in the surface temperature of the molding material W, it is possible to increase the internal temperature due to heat transfer to the inside of the molding material W. Appropriate control can be performed to prevent such voids.

  It should be noted that the reduction of the output of the infrared heater after a lapse of a predetermined time and the control based on the heater stage output setting pattern table can be executed even in heating by the infrared heater whose heat generation temperature is not limited to 1450 ° C. or more and 1650 ° C. or less. Each has the above-described effects.

  1. Heating device, 6. Stage (heating target support means), 44 ... Lower infrared heater, 46 ... Lower reflector (reflecting means), 64 ... Upper infrared heater, 66 ... Upper reflector (reflective) Means), S3 .. Output reduction step, W .. Molding material (resin composite material).

Claims (9)

An infrared heater having an exothermic temperature of 1450 ° C. or higher and 1650 ° C. or lower;
A heating target support means for supporting at least one of a resin to be heated and a resin composite material at a position where infrared rays from the infrared heater are irradiated;
A resin or resin composite material heating apparatus comprising: The resin or resin composite material heating device according to claim 1, wherein the infrared heater includes a carbon heater having a carbon filament. The resin or resin composite material heating device according to claim 1, wherein the infrared heaters are provided above and below the heating target. The resin or resin composite material heating device according to any one of claims 1 to 3, wherein the heating object support means is made of carbon. The heating object support means is movable from the carry-in position where the heating object is carried to the carry-out position where the heating object is carried to the carry-out position through which the infrared ray is irradiated to the carry-out position. The resin or resin composite material heating apparatus according to any one of claims 1 to 4. The resin or resin composite material heating apparatus according to claim 1, further comprising a reflection unit configured to reflect the infrared ray toward the heating target. Furthermore, it comprises a control means for adjusting the output of the infrared heater,
The control means adjusts the output of the infrared heater based on a heater stage output setting pattern table in which a ratio of the output of the infrared heater to a maximum output is associated with a time during which the output related to the ratio is continued. The resin or resin composite material heating device according to any one of claims 1 to 6. A method for heating a resin or a resin composite material, comprising irradiating at least one of a resin to be heated and a resin composite material with infrared rays emitted from an infrared heater having an exothermic temperature of 1450 ° C or higher and 1650 ° C or lower. The resin or resin composite material heating method according to claim 8, wherein the output of the infrared heater is reduced with the passage of a predetermined time after the start of heating with respect to the output of the heating target at the start of heating.