JP2018037165A - Induction heating apparatus and induction heating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating apparatus and an induction heating method by which induction heating can be efficiently performed for plural tabular heating target objects formed by weaving carbon fibers into resin.SOLUTION: In an induction heating method, plural tabular heating target objects 1a-1c formed by weaving carbon fibers into resin are stacked, and defining an upper surface 1u of the plural stacked heating target objects 1a-1c as a heating surface, the plural heating target objects 1a-1c are simultaneously heated from the heating surface side using an induction heating coil 2. Further, at predetermined time intervals including the simultaneous heating of the plural heating target objects, the heating target object having an uppermost or lowermost surface is taken out, and after taking out the heating target object, the remaining heating target objects are advanced. Then, at predetermined time intervals, after taking out the heating target object, a new heating target object is carried in from the opposite side of the uppermost or lowermost surface from which the heating target object has been taken out. By this method, continuous and simultaneous heating processing can be performed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an induction heating apparatus and an induction heating method capable of efficiently performing induction heating on a plurality of planar heating objects in which carbon fibers are knitted into a resin.

  Conventionally, as a method of heating the heated surface of the object to be heated in a non-contact manner, a method in which a high-temperature gas is blown and heated using heat transfer of the heated surface, a heating element such as a heating wire heater is heated. A method of heating an object close to the surface to be heated and radiant heat from a heating element, a method of applying infrared rays such as a lamp heater to the surface to be heated and heating with radiant heat by infrared rays, and induction to the surface to be heated using an electromagnetic induction coil There is a method of inducing an electric current and heating a surface to be heated by resistance heat due to the material of the object to be heated.

  Here, when the surface to be heated is heated using the induction heating coil, the induction heating coil is moved to heat the surface to be heated evenly. As a method of moving the induction heating coil, an induction heating coil is attached to the wrist portion at the tip of the robot arm, and the induction heating coil is moved in accordance with the shape of the surface to be heated in accordance with the program of the robot.

  In Patent Document 1, when a thin plate-like object to be heated is heated using an induction heating coil, two substantially V-shaped coils are synthesized according to the width of the object to be heated. There is a description that the synthetic coil shape is made variable to reduce overheating at the edge of the object to be heated.

JP 2010-245029 A

  By the way, when heating a plurality of flat objects to be heated in which carbon fibers are knitted into a resin, for example, a CFRP plate using an induction heating coil, the main material of the CFRP plate is a resin having low thermal conductivity, and carbon Even if the fibers are induction-heated, it takes time to raise the entire CFRP plate material to the softening point temperature for molding such as pressing.

  On the other hand, the molding processing time such as press processing for the CFRP plate preheated by the induction heating coil is short.

  As a result, the production processing time for continuously performing the preheating and forming of the CFRP plate material depends on the induction heating time of the CFRP plate material. That is, since the induction heating time is long, the production efficiency is lowered. In order to shorten the induction heating time, it is necessary to provide a plurality of induction heating apparatuses, but the scale of the apparatus increases, and the delivery process of the preheated CFRP plate material to the molding machine becomes complicated.

  The present invention has been made in view of the above, and provides an induction heating apparatus and an induction heating method capable of efficiently performing induction heating on a plurality of planar heating objects in which carbon fibers are knitted into a resin. The purpose is to do.

  In order to solve the above-described problems and achieve the object, an induction heating apparatus according to the present invention includes a plurality of flat heating objects in which carbon fibers are knitted into a resin, and a plurality of heating objects stacked. The uppermost surface or the lowermost surface is a surface to be heated, and the plurality of objects to be heated are simultaneously heated from the surface to be heated using an induction heating coil.

  In the induction heating device according to the present invention, in the above invention, the induction heating coil has a heating surface smaller than the surface to be heated, and the plurality of heating objects and the induction heating coil are provided. The plurality of heating objects are heated by relatively moving in a non-contact manner.

  In addition, the induction heating device according to the present invention, in the above invention, an unloading mechanism for unloading the heating object having the uppermost surface or the lowermost surface at a predetermined time interval including simultaneous heating with respect to a plurality of heating objects; After unloading the heating object, a lifting mechanism that lifts the remaining heating object, and the heating object being unloaded by the unloading mechanism at the predetermined time interval, and then on the opposite side of the heating object unloaded. And a carry-in mechanism for carrying in a new heating object from the lower surface or the uppermost surface.

  In the induction heating device according to the present invention, in the above invention, the heating of the object to be heated is preheating before forming, and the predetermined time interval is formed with respect to one preheated object to be heated. It is a processing time.

  The induction heating device according to the present invention is characterized in that, in the above invention, a magnetic material is disposed on a surface opposite to the surface to be heated of the object to be heated, with the induction heating coil interposed therebetween.

  The induction heating device according to the present invention is characterized in that, in the above invention, the heating object is a thin plate-like CFRP plate.

  The induction heating apparatus according to the present invention is characterized in that, in the above invention, the heating temperature of the heating object is a softening point temperature of the CFRP plate material.

  Further, the induction heating method according to the present invention is a method in which a plurality of planar heating objects in which carbon fibers are knitted into a resin are stacked, and the uppermost surface or the lowermost surface of the stacked heating objects is a surface to be heated, A plurality of objects to be heated are simultaneously heated using an induction heating coil from the heated surface side.

  In addition, the induction heating method according to the present invention is the above-described invention, wherein in the above invention, an unloading step of unloading the heating object having the uppermost surface or the lowermost surface at a predetermined time interval including simultaneous heating with respect to a plurality of heating objects; After the heating object is unloaded, after the heating object is unloaded at the predetermined time interval and the heating object is unloaded by the unloading process, the outermost object on the side opposite to the unloaded heating object. And a carrying-in process of carrying in a new heating object from the lower surface or the uppermost surface.

  According to the present invention, a plurality of planar heating objects in which carbon fibers are knitted into a resin are stacked, and the uppermost surface or the lowermost surface of the stacked heating objects is a heated surface, and the heated surface side Since the plurality of heating objects are simultaneously heated using an induction heating coil, the heating time for one heating object can be shortened.

FIG. 1 is a schematic diagram showing an overall configuration of an induction heating apparatus according to an embodiment of the present invention. FIG. 2 is an explanatory view for explaining the simultaneous heating processing of the heating object. FIG. 3 is a diagram showing a continuous simultaneous heating process flow of the heating object.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

(overall structure)
FIG. 1 is a schematic diagram showing an overall configuration of an induction heating apparatus according to an embodiment of the present invention. As shown in FIG. 1, the induction heating apparatus includes a robot arm 3 having an induction heating coil 2 attached to the wrist at the tip, a control unit 5, a display unit 6, an operation unit 7, and a storage unit 8.

  The induction heating coil 2 is, for example, a spiral disk coil wound in a circular shape. The position and posture of the induction heating coil 2 can be changed by the robot arm 3. The movement path, the movement speed, and the output including the position and posture of the induction heating coil 2 are controlled under the control unit 5. The induction heating coil 2 performs induction heating in a state where the heating objects 1a to 1c, which are flat CFRP plate materials in which carbon fibers are knitted into resin, are overlapped. The induction heating coil 2 simultaneously heats the heating objects 1a to 1c while moving close to the upper surface 1u of the uppermost heating object 1a.

  The induction heating coil 2 generates a magnetic field by a high-frequency current supplied from a power source (not shown), generates eddy currents in the heating objects 1a to 1c, and heats the heating objects 1a to 1c by the resistance heat. Since the upper surface 1u is larger than the size of the induction heating coil 2, the induction heating coil 2 is moved to heat the upper surface 1u so that it is evenly stroked. In this embodiment, the induction heating coil 2 is moved with respect to the upper surface 1u. However, the upper surface 1u may be moved with respect to the induction heating coil 2 together with the heating objects 1a to 1c. . Furthermore, you may move both the induction heating coil 2 and the heating target objects 1a-1c. That is, any mechanism can be used as long as the positional relationship between the upper surface 1u and the induction heating coil 2 can be relatively moved.

  The display unit 6 displays and outputs various information such as the upper surface 1u, the movement path and movement state of the induction heating coil 2, and the temperature distribution states of the heating objects 1a to 1c detected by infrared thermography (not shown).

  The operation unit 7 issues a control instruction to the control unit 5. The operation unit 7 is realized by a keyboard or a pointing device. The storage unit 8 holds control programs and various information.

(Simultaneous heating of objects to be heated)
As shown in FIG. 2, the induction heating coil 2 maintains the gap g with the upper surface 1 u of the uppermost heating object 1 a and moves so as to stroke the upper surface 1 u evenly. Heat ~ 1c at the same time. The magnetic field lines generated from the induction heating coil 2 cause the carbon fibers 11 to generate heat by causing an induction current to flow through the woven carbon fibers 11 in the resins of the heating objects 1a to 1c and generating eddy currents. The surrounding resin temperature is also raised by the heat generated by the carbon fibers 11. The heating of the heating objects 1a to 1c by the induction heating coil 2 is performed until the heating objects 1a to 1c reach the resin softening temperature. The reason for raising the temperature to the resin softening temperature is to perform molding processing such as press processing on the heating objects 1a to 1c thereafter.

  In the case of induction heating, the heated portion is in the vicinity of the surface of the object to be heated due to factors such as the high-frequency current supplied to the induction heating coil 2 and is almost converted to thermal energy in the vicinity of the surface. Accordingly, even when heating objects such as metals are stacked and simultaneously heated, the magnetic field lines do not reach the heating object arranged at a position far from the induction heating coil 2 and the temperature is not increased in most cases.

  On the other hand, the heating objects 1a to 1c, which are CFRP plate materials, are mainly made of resin, which is a dielectric (non-magnetic material), so that the lines of magnetic force pass through the resin portion. Magnetic field lines also reach the object 1c, an induced current flows through the carbon fiber 11 of the object 1c to be heated, and it is heated. In the present embodiment, this principle is used to simultaneously heat a plurality of heating objects 1a to 1c.

  In addition, as shown in FIG. 2, it is preferable to arrange | position the magnetic bodies 4, such as a ferrite, on the surface on the opposite side to the upper surface 1u which is the to-be-heated surface of the to-be-heated object 1a on both sides of the induction heating coil 2. By arrange | positioning the magnetic body 4, the magnetic force line in the upper part of the induction heating coil 2 is turned up, and an energy loss reduces.

  In this Embodiment, since it heats simultaneously the some heating target object 1a-1c, the heating time with respect to one heating target object can be shortened.

  Note that the simultaneous heating of the heating objects 1a to 1c by the induction heating coil 2 may be performed from the lower surface 11 side of the heating object 1c. Moreover, the heating objects 1a to 1c may be arranged in the horizontal direction, and the induction heating coil 2 may be moved in the vertical direction. In short, as long as the relative positional relationship between the heating objects 1a to 1c and the induction heating coil 2 is maintained, their absolute directions or positions may be in any state.

  Moreover, you may provide a clearance gap between the heating target objects 1a-1c, and you may overlap in the state which contact | adhered.

(Simultaneous simultaneous heating of heated objects)
FIG. 3 is a diagram showing a processing flow in the case where the simultaneous heating of the heating object is continuously performed. In FIG. 3, as in FIG. 2, three heating objects are heated simultaneously. In this continuous simultaneous heating process, as shown in FIG. 3A, first, the heating objects 1 a to 1 c are simultaneously heated by the induction heating coil 2. Then, as shown in FIG.3 (b), the heating object 1a by the side of the induction heating coil 2 is carried out by the carrying-out mechanism 21, and is sent to the molding machine which is not shown in figure.

  Thereafter, as shown in FIG. 3C, the heating objects 1b and 1c remaining by the lifting mechanism 22 are moved up to the positions where the heating objects 1a and 1b are arranged. Thereafter, the new heating object 1d is carried into the position where the heating object 1c was placed by the carry-in mechanism 23. As a result, as shown in FIG. 3D, the three heating objects 1b to 1d are overlapped. In this state, similarly to FIG. 3A, the heating objects 1 b to 1 d are simultaneously heated by the induction heating coil 2.

  Thereafter, as shown in FIG. 3E, the heating object 1b on the induction heating coil 2 side is carried out by the carry-out mechanism 21 and sent to a molding machine (not shown).

  Thereafter, as shown in FIG. 3F, the heating objects 1c and 1d remaining by the lifting mechanism 22 are moved up to the positions where the heating objects 1b and 1c are arranged. Thereafter, the new heating object 1e is carried into the position where the heating object 1d has been arranged by the carry-in mechanism 23. Thereafter, similarly to FIG. 3 (d), the heating objects 1c to 1e are simultaneously heated by the induction heating coil 2, and the above-described processes of FIGS. 3 (e) and 3 (f) are repeated.

  By this continuous simultaneous heating process, one heating object is sent from the induction heating device to a molding machine (not shown) every predetermined time T. Moreover, for example, the heating object 1a sent from the induction heating device is heated three times before being sent, and in particular when it is arranged at the position of the heating object 1b and at the position of the heating object 1c. Since preheating is sometimes performed, the heating time for the third simultaneous heating is shortened.

  In the continuous simultaneous heating process, the object to be heated is carried out from the induction heating coil 2 side, and the object to be heated is carried into a position far from the induction heating coil 2, but heating at a position far from the induction heating coil 2 is performed. You may make it carry out a target object and carry in a heating target object from the induction heating coil 2 side.

  Moreover, since the heating surface of the induction heating coil 2 described above is smaller than the surface to be heated of the object to be heated, the induction heating coil 2 heats the surface to be heated evenly. Since the heating by the induction heating coil 2 can be heated only directly under the induction heating coil 2, the area of the heated surface that can be heated at one time is narrow, and it takes time to heat the entire heated surface. Furthermore, if the temperature difference in the heating object is large, thermal stress is generated in the heating object and the heating object may be deformed. Therefore, the induction heating coil 2 can be boiled multiple times on the surface of the heating object. Since the temperature of the object to be heated is gradually increased by moving, the heating time is long from this point.

  In the present embodiment, the long heating time described above when the induction heating coil 2 is used can be shortened by simultaneous heating processing or continuous simultaneous heating processing.

  Moreover, in the simultaneous continuous heat treatment, the CFRP plate material heated to the softening point temperature of the resin in the heating object can be supplied in accordance with the production interval of the molding machine, which is a subsequent process, and the production efficiency can be improved. it can.

  In addition, in embodiment mentioned above, although heating object 1a-1c was a rectangle, not only this but various shapes, such as circular and an ellipse, may be sufficient. Furthermore, the shapes of the heating objects 1a to 1c may be different.

1a to 1e Heated object 1u Upper surface 1l Lower surface 2 Induction heating coil 3 Robot arm 5 Control unit 6 Display unit 7 Operation unit 8 Storage unit 21 Unloading mechanism 22 Lifting mechanism 23 Loading mechanism T Predetermined time

Claims (9)

  A plurality of flat heating objects in which carbon fibers are knitted into resin are stacked, and the uppermost surface or the lowermost surface of the stacked heating objects is a heated surface, and an induction heating coil is used from the heated surface side. An induction heating apparatus that heats the plurality of heating objects simultaneously.   The induction heating coil has a heating surface that is smaller than the surface to be heated, and relatively moves the plurality of heating objects and the induction heating coil in a non-contact manner, thereby moving the plurality of heating objects. The induction heating apparatus according to claim 1, wherein the induction heating apparatus is heated. An unloading mechanism for unloading the heating object having the uppermost surface or the lowermost surface at a predetermined time interval including simultaneous heating with respect to a plurality of heating objects;
After unloading the heating object, a lifting mechanism that raises the remaining heating object;
After the heating object is unloaded by the unloading mechanism at the predetermined time interval, a loading mechanism for loading a new heating object from the lowermost surface or the uppermost surface opposite to the unloaded heating object;
The induction heating apparatus according to claim 1 or 2, further comprising: The heating of the object to be heated is preheating before molding processing,
The induction heating apparatus according to claim 3, wherein the predetermined time interval is a molding processing time for one preheated heating object.   The induction heating apparatus according to any one of claims 1 to 4, wherein a magnetic body is disposed on a surface opposite to the surface to be heated of the object to be heated, with the induction heating coil interposed therebetween.   The induction heating apparatus according to claim 1, wherein the heating object is a thin plate-like CFRP plate material.   The induction heating apparatus according to claim 6, wherein the heating temperature of the heating object is a softening point temperature of the CFRP plate material.   A plurality of flat heating objects in which carbon fibers are knitted into resin are stacked, and the uppermost surface or the lowermost surface of the stacked heating objects is a heated surface, and an induction heating coil is used from the heated surface side. Then, an induction heating method characterized by simultaneously heating a plurality of the heating objects. An unloading step of unloading the heating object having the uppermost surface or the lowermost surface at a predetermined time interval including simultaneous heating with respect to a plurality of heating objects;
After carrying out the heating object, a lifting step of lifting the remaining heating object;
After the heating object is unloaded by the unloading step at the predetermined time interval, a loading process of loading a new heating object from the lowermost surface or the uppermost surface opposite to the unloaded heating object;
The induction heating method according to claim 8, comprising:

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