JP2017159558A - Electromagnetic induction heating type resin molding die and method for producing resin molding using the die - Google Patents

Abstract

In an electromagnetic induction heating mold, a temperature gradient cannot be intentionally imparted by local heating in the entire surface heating, and it is not possible to efficiently heat to a necessary portion of the mold to be originally heated. Further, since the induction heating coil for electromagnetic induction heating is formed integrally with the mold, local heating required for each molded product cannot be performed. SOLUTION: In an electromagnetic induction heating type resin molding die, the die has an induction heating coil cassette easily detachable, and the induction heating coil cassette is a coil holding plate and an induction heating coil attached to the coil holding plate. It consists of. The induction heating coil cassette which can be easily attached and detached locally heats the mold, and local cooling can be performed by flowing the cooling medium only to the cooling holes arranged in the vicinity of the locally heated portion. [Selection diagram] Figure 2

Description

  The present invention relates to an electromagnetic induction heating type resin molding die and a method for producing a resin molded body using the die. More specifically, an electromagnetic induction heating type resin molding die capable of performing temperature gradient heating by local heating of the resin molded body by local induction heating of the cassette-type coil, which is easy to be detached, and temperature gradient cooling by local cooling, and this mold The present invention relates to a method for producing a resin molded body that enables high cycle molding by performing local heating and local cooling using a mold.

  Examples of the resin molding method using a mold include an injection molding method, a compression molding method, and a blow molding method. These are methods in which a molten raw material resin is put into a mold and then heat is transferred to shape and solidify the resin. As a method for heating the mold, a method using a high-frequency electromagnetic induction heating is known in addition to a method using an electric heater, a method using a heat medium such as steam or oil. A resin molding die using this high-frequency electromagnetic induction as a heating means does not require a heating medium, and thus is excellent in terms of equipment cost and operation cost, and has attracted attention in recent years. Such heating of the mold is an essential technique for weldless molding and high transfer molding.

  As a conventional technique for such a weldless molding and high transfer molding, for example, in Patent No. 4052600, a mold nesting is divided into a nesting front member having a cavity surface and a nesting back member not having a cavity surface. A mold is disclosed in which a groove passing through a portion near the cavity surface is provided in the nesting surface member, and an electric heater is accommodated in the groove. However, in this configuration, because the weld line generation location is different for each mold, it is necessary to design a groove for storing the electric heater, and it is difficult to deal with a wide variety of molded products. It was.

  Further, in Patent 5281283 of the same applicant, a resin molded body having a groove for storing an electric heater, and having the electric heater divided into a plurality of systems and performing different temperature control for each control zone by the same configuration. A configuration for preventing the occurrence of the weld line is disclosed. However, this configuration also has the disadvantage that it is difficult to deal with a wide variety of molded products, as in the above-mentioned reference.

  Furthermore, in Japanese Patent Laid-Open No. 2007-8035, a pair of mold plates that are opened and closed relatively, a cavity side mold and a core side mold embedded in the pair of mold plates, respectively, are installed inside the cavity side mold. In addition, a molding die apparatus has been disclosed in which a heat source body that heats the cavity side die to a high temperature equal to or higher than the thermal deformation temperature of the resin is housed to prevent weld line generation. However, even in this configuration, the basic configuration in which the heat source body is housed in the mold is not different from the above-mentioned reference, and therefore, it has a drawback that it is difficult to deal with a wide variety of molded products.

  Similar configurations are also disclosed in JP 2007-8036, JP 2007-223168, and JP 2009-226778 related to the same applicant, but each configuration houses the heat source in the mold. The basic configuration is the same as the above-mentioned reference, and thus this configuration has a drawback that it is difficult to cope with a wide variety of molded products.

  Next, as a mold for resin molding using high frequency electromagnetic induction as a heating means, JP-T-2007-535786 has means for applying an electromagnetic field to an intermediate element disposed between an inductor and a material to be heated. A mold is disclosed. However, this configuration heats the entire mold and does not heat only the necessary minimum range according to the shape of the mold, and thus has a disadvantage of wasting heating energy.

  Further, Japanese Patent Application No. 2006-546570 by the same applicant also discloses a mold in which a plurality of cavities surround field windings. However, in this configuration, the size of the field winding cannot be easily changed according to the shape of the part to be molded or deformed, and there is a disadvantage that the heating energy is wasted as in the above-mentioned reference.

  In addition, Japanese Patent Application No. 2009-507674 by the same applicant discloses a configuration that enables local heating by high-frequency electromagnetic induction, unlike the above reference. That is, an inductor network electrically connected to the current generator is disposed around the mold casing, and a shielding layer is provided on a part of the outer surface of each mold casing so that the two mold casings face each other. A portion of the surface is coated to allow local heating. The nonmagnetic material used for this shielding layer is, for example, copper or aluminum having a low resistivity so as to limit energy loss. However, even with this configuration, local heating cannot be performed even in accordance with the shape of the resin molded body, and there is still a disadvantage that the heating energy is wasted as in the above-mentioned reference.

  Next, as a resin molding die using high-frequency electromagnetic induction by the applicant of the present application as a heating means, Japanese Patent Laid-Open No. 2012-214040 describes that cavity surfaces are molded into two molds constituting a mold, each having a cavity surface. Disclosed is an electromagnetic induction heating mold apparatus for resin molding configured to dispose a magnetic metal portion at a site and to arrange a plurality of induction coils on the outer surface of the magnetic metal portion within a predetermined range from the outer peripheral edge of the cavity. ing. However, even in this configuration, an induction coil must be provided for each mold, and the configuration is not limited to the electromagnetic induction local heating by the cassette type coil but the electromagnetic induction full surface heating, and the local cooling is not the local cooling. Such a configuration tends to waste heating / cooling energy. Furthermore, since the induction coil is disposed with a fixed gap from the outer peripheral edge of the cavity, it has a drawback that it is difficult to impart a temperature gradient to each part of the mold cavity surface.

  Finally, as in the case of the above-mentioned reference, Japanese Patent Application Laid-Open No. 2013-226810 by the applicant of the present application discloses a time required in a continuous resin molding manufacturing cycle using an electromagnetic induction heating mold having a structure similar to that of the above-mentioned reference. A method for producing a resin molded body that stably shortens the length is disclosed. However, the electromagnetic induction heating mold used here has not reached the technical idea of local heating and cassette formation of the heating coil as described above, and eventually has the disadvantage that it is not an efficient method for producing a resin molded body. Have.

Japanese Patent No. 4052600 Japanese Patent No.5261283 JP 2007-8035 Gazette JP 2007-8036 A JP 2007-223168 JP 2009-226778 Special Table 2007-535786 Publication Special Table 2006-546570 Special Publication 2009-507674 JP 2012-214040 A JP 2013-226810 A

  The problem to be solved is the structure of whole surface heating and whole surface cooling in the conventional electromagnetic induction heating mold, and it corresponds to the place where the weld line is generated and the part where transferability is imperfect depending on the shape of each resin molding. , It had the disadvantage that it was not possible to efficiently perform local heating and local cooling. In other words, it has a structure in which the entire surface is wasted and cooled unnecessarily, and the energy cannot be used efficiently. Furthermore, the induction heating coil for electromagnetic induction heating is configured integrally with the mold, and has a drawback that the electromagnetic induction coil cannot be easily replaced for each shape of each resin molded body. Furthermore, due to the structure in which the gap between the surface of the mold / mold cavity and the induction heating coil is fixed, there is a drawback that it is impossible to give a subtle temperature gradient to the mold cavity surface.

  The electromagnetic induction heating type resin molding die according to the present invention is a coil cassette for induction heating that is easy to detach according to the shape of the resin molded body to be molded, and is configured to perform temperature gradient heating by local heating. The coil cassette includes a coil holding plate and an induction heating coil attached to the coil holding plate. An arbitrary number of induction heating coils can be attached according to the shape of the resin molded body to be molded, and the gaps between the individual induction heating coils and the coil holding plates can be individually adjusted. The coil cassette can be mounted and adjusted by providing an arbitrary gap from the heating surface of the mold body. The mold cooling is also configured such that temperature gradient cooling is performed by local cooling corresponding to the location of the local heating. Further, the coil cassette is configured so as to give a subtle temperature gradient to the mold cavity surface by providing an appropriate gradient rather than parallel to the mold cavity surface. The provision of the temperature gradient may be a configuration in which an additional magnetic material (soft ferrite) or the like is disposed close to each induction heating coil.

  In the present invention, the induction heating coil is made into a cassette to minimize the heat capacity by local heating, and at the same time, local cooling is performed corresponding to the location of the local heating, so that defective parts such as weld lines on the surface of the resin molded body are efficiently processed. It can be solved well. In addition, such local heating and local cooling have advantages in that high cycle molding can be achieved, mold costs can be reduced, and workability can be improved. Furthermore, by providing the induction heating coil cassette with an appropriate inclination with respect to the mold cavity surface, there is an advantage that the temperature of the mold cavity surface can be finely adjusted by freely providing a temperature inclination. In particular, unlike the conventional full-surface heating configuration, only the vicinity where the induction heating coil is installed can be heated locally, and by cooling this part locally, an efficient mold heating and cooling process can be performed. It can be configured. Furthermore, the coil cassette of the present invention can adjust the gap between the coil holding plate and the heating surface of the mold body, and also adjust the gap between each induction heating coil and the coil holding plate. The energy can be used efficiently by heating and cooling flexibly.

FIG. 1 is a schematic connection diagram of an electromagnetic induction heating type resin molding apparatus in which an electromagnetic induction heating type resin molding die according to the present invention is housed and installed in a resin molding machine. FIG. 2 is a cross-sectional view of the electromagnetic induction heating type resin molding die of the present invention. FIG. 3 is a plan view in which a coil cassette is installed in a design surface mold. FIG. 4 is a plan view showing another embodiment in which soft ferrite is arranged in the vicinity of the induction heating coil.

  FIG. 1 is a schematic connection diagram of an electromagnetic induction heating type resin molding apparatus 1 in which an electromagnetic induction heating type resin molding die 100 according to the present invention is housed and installed in a resin molding machine 200. An electromagnetic induction heating device 300 and a cooling mechanism 400 are connected to a resin molding machine 200 containing the electromagnetic induction heating type resin molding die 100 for supplying cooling water and air for supplying heating power. Since this configuration itself is the same as that of a conventional electromagnetic induction heating type resin molding apparatus, the details are omitted. The most fundamental configuration necessary for induction heating is a high-frequency transmission unit (inverter), a heating coil (inductor), and a material to be heated, but in the present invention, it further includes a transformer and a condenser called a matching unit (not shown). Thus, it is possible to optimize the shape of the heating coil in a wide range, and it is configured to realize local heating and temperature gradient control by a plurality of heating coils and soft ferrite.

  FIG. 2 is a sectional view of the electromagnetic induction heating type resin molding die 100 of the present invention, and FIG. 3 is a plan view in which the coil cassette 30 is installed on the design surface die 100b. That is, the mold 100 includes a left non-design surface side mold 100a in FIG. 2 and a right design surface side mold 100b. Between the non-design surface side mold 100a and the design surface side mold 100b, there is provided a mold cavity 100c having an arbitrary shape in which a resin molded body is molded. The former non-design surface side mold 100a is integrally attached to the mounting plate 10 as in the conventional mold, and a plurality of cooling holes 50 and ejectors 11 are provided inside for cooling. On the right side of the mold 100, a design surface side mold 100b is provided with a molding cavity 100c interposed therebetween. A coil / cassette 30 for electromagnetic induction heating is attached to the design surface side mold 100b in a coil / cassette storage unit 20 having a predetermined depth. A plurality of cooling holes 50 through which the cooling medium from the cooling mechanism flows are also provided in the heated metal portion 40 on the mold cavity 100 c side with respect to the coil cassette 30.

  Here, the coil cassette 30 has, for example, a heat-resistant temperature of 100 ° C. or higher, a coil holding plate 31 having a thickness of about 1 to 30 mm for reasons of insulation and heat resistance, and a non-magnetic attachment plate (not shown). An induction heating coil 33 is attached to the coil holding plate 31 with an induction heating coil mounting screw 34. However, the attachment method is not particularly limited, such as holding the coil from the outside. The reason why the thickness is limited to about 1 to 30 mm is that it is considered optimum from the viewpoint of mechanical strength, taking into account the insulation and heat resistance. If it exceeds 30 mm, eddy currents are hardly generated in the metal part 40 to be heated and induction heating is difficult.

  The induction heating coil 33 has an inner dimension radius R of 50 mm or less, for example. The inner radius R is set to 50 mm or less so that the inner diameter portion of the coil of the metal to be heated is evenly heated, and temperature gradient heating is possible by local heating of the metal portion 40 to be heated. It becomes. That is, if the inner radius R is set to such a small diameter so that the induced magnetic flux is perpendicular to the metal part 40 to be heated, energy can be evenly concentrated on the portion where the temperature is desired to be increased, and the inner diameter can be reduced. This is because if the thickness is 50 mm or more, a portion with a small magnetic flux density is formed in the inner diameter portion of the coil, and the temperature of the projection surface onto the heating surface of the inner diameter portion of the coil becomes low. This inner radius R may be appropriately determined according to the shape and size of the resin molded body in the mold cavity. The induction heating coil 33 is mounted at a position near the location where the weld line of the resin molding is likely to occur or where there is a high probability of occurrence of molding defects such as an incomplete transferability. You may comprise so that arrangement | positioning change of the induction heating coil 33 can be freely carried out on the holding plate 31. FIG. For example, as shown in FIG. 3, it is the vicinity of the convex part 90 of a resin molding, and is a location which becomes the downstream side of molten resin with respect to the convex part 90. FIG. In such a place, the divided molten resin joins and the flow velocity is lowered, so that it is not sufficiently fused and a weld line is likely to occur. Therefore, by locally heating such a part, it becomes possible to effectively prevent the occurrence of a weld line unlike the entire surface heating. The size (outer diameter) of the induction heating coil 33 is also set to the minimum necessary size corresponding to the size of the convex portion 90 and the size and shape of the molded body, and the number of induction heating coils 33 is defective such as a weld line. It is possible to minimize the heating power by matching the number of occurrence points. Further, the thickness of the coil holding plate 31 may be appropriately changed depending on the number of induction heating coils 33 or the like.

  The coil cassette 30 is planarly attached to the heated metal portion 40 as shown in FIG. 2 by means of a coil / cassette attachment screw 32 shown in FIG. Note that the attachment gap with the metal portion 40 to be heated can be adjusted by the coil / cassette attachment screw 32, and the heating adjustment may be performed by this adjusted attachment gap. Further, the coil cassette 30 can be freely adjusted, for example, by adjusting the coil cassette mounting screws 32 provided at the four corners so that the metal portion 40 to be heated (at the same time with respect to the mold cavity 100c) has an appropriate inclination angle. A temperature gradient may be imparted. Thereby, fine adjustment of heating becomes possible. Unlike the mold according to the conventional example, such a temperature gradient can only be provided by configuring the coil cassette 30 as a separate housing from the design surface mold 100b main body as in the present invention.

  Further, the coil cassette 30 will be described in detail. The induction heating coil 33 is attached to the coil holding plate 31 with the induction heating coil mounting screw 34. You may comprise so that a gap with the to-be-heated metal part 40 can be finely adjusted by adjusting a spacer etc. to the heating coil attachment screw 34, etc. The method of attaching the induction heating coil 33 to the coil holding plate 31 is not limited to the configuration in which the induction heating coil attachment screw 34 is attached at the coil center as described above. Not limited. In addition, the induction heating coil 33 can be attached in an arbitrary number according to the shape of the resin molding to be molded, and the gap between each induction heating coil 33 and the coil holding plate 31 is also adjusted by the induction heating coil attachment screw 34. Can be adjusted individually. By configuring the coil cassette 30 in this way, it is possible to efficiently use energy by flexibly heating and cooling according to the shape of the resin molded body to be molded. Therefore, by making the coil into a cassette, it becomes possible to freely impart a temperature gradient as compared with a conventional configuration in which the coil is fixedly installed on the mold body.

  Furthermore, the metal part 40 to be heated shown in FIG. 2 may be an alloy having a different Curie temperature or a composite material thereof, and temperature control may be performed. This is particularly effective when the upper limit of the heating temperature is controlled.

  Next, in the electromagnetic induction heating type resin molding die 100 according to the present invention, as shown in FIG. 2, a plurality of cooling holes 50 are provided in the left non-design surface side die 100a and the right design surface side die 100b. (A, b, c, d) are respectively arranged. In particular, a plurality of cooling holes 50 provided in the right design surface side mold 100 b are provided in the heated metal portion 40 on the mold cavity 100 c side of the coil cassette 30. On the other hand, a conventional mold heated by an electric heater has a drawback that the cooling efficiency is low because the cooling hole is provided away from the cavity with the electric heater interposed therebetween. However, the present invention has an advantage that the cooling efficiency is good because the cooling hole 50 is provided at a position closer to the mold cavity 100c. This is possible because the coil cassette 30 is configured as a separate housing from the heated metal portion 40. Each cooling hole 50 is configured to be able to control injection / discharge of the cooling medium by a control unit (not shown). In this embodiment, two induction heating coils 33 are attached to the design surface mold 100b in the vicinity of the cooling holes 50a and 50c for temperature gradient heating by local heating. Therefore, after the temperature is heated by local heating by the induction heating coil 33 and the molten resin is injected, the cooling medium is injected only into the cooling holes 50a and 50c arranged in the vicinity of the induction heating coil 33 and cooled. In other words, a cooling medium is not injected into the cooling holes 50b and 50d arranged in the vicinity where they are not locally heated, or the amount of the cooling medium is reduced as compared with 50a and 50c. In this way, in the invention of this application, not only heating and cooling are performed entirely and not entirely, but also local heating and local cooling not only minimize energy consumption, but also shorten the molding process to achieve high cycle molding. Is configured to be possible. Further, the air purge of the cooling mechanism 400 in FIG. 1 prevents energy loss of heating the cooling medium by replacing the air inside the cooling holes after the cooling and before the heating step.

  FIG. 4 is a plan view showing another embodiment in which a plurality of soft ferrites are arranged in the vicinity of the induction heating coil 33. Typical examples of the soft ferrite include manganese zinc ferrite, nickel zinc ferrite, and copper zinc ferrite. Because of its high magnetic permeability and high electrical resistance, eddy current loss in the high frequency region is small, so it is used as a magnetic core material for high-frequency inductors and transformers called “ferrite cores”. By arranging such soft ferrite, the magnetic flux is controlled and the magnetic flux density is increased. As a result, the current density of the eddy current is also increased, so that the heating efficiency of the metal part 40 to be heated shown in FIG. 2 is increased. It is possible. If necessary, a metal such as a copper plate having a low electrical resistance and relatively difficult to be induction-heated may be disposed around the induction heating coil. In other words, by utilizing the skin effect due to the eddy current on the copper plate, electromagnetic shielding is performed on the metal part 40 to be heated, thereby making it possible to finely adjust the temperature of the portion where heating by the induction coil is low. . In other words, a copper plate or the like, which is a nonmagnetic conductive material having a sufficiently low electrical resistance and a thickness equal to or greater than the skin depth, is disposed in the vicinity of the induction heating coil 33, thereby reducing the magnetic flux density and reducing the need for heating. It becomes possible to finely adjust the heating temperature of the metal part 40 to be heated by substantially magnetically shielding the part. In any case, by arranging ferrite, a copper plate or the like in the vicinity of the induction heating coil 33, there is an advantage that temperature gradient heating can be performed by more efficient local heating. (A) is a structure in which soft ferrite is disposed inside the induction heating coil 33, (b) is disposed outside the induction heating coil 33, and (c) is disposed in the upper part. Since temperature gradient heating is measured, each arrangement is preferably determined according to the shape or the like of the resin molded body.

  Note that the size (outer diameter) of the induction heating coil 33 may be changed to change the degree of concentration of the heating energy with respect to the heated portion, thereby performing temperature control of local heating. Naturally, if the coil size is reduced, the concentration of the heating energy is improved, and local heating at a high temperature is possible.

  In addition, in this invention, the manufacturing method of the resin molding using the said electromagnetic induction heating type resin molding apparatus 1 is also disclosed collectively. That is, first, with the mold 100 opened, the induction heating coil 33 is energized to perform temperature gradient heating of the mold cavity 100c by local heating, thereby applying a gradient temperature and raising the temperature to a predetermined temperature. Next, the mold 100 is closed and the mold cavity 100c is filled with resin, and the pressure is maintained. After a predetermined time has elapsed, only the vicinity of the part heated locally by the cooling mechanism 400 connected to the mold 100 is locally cooled. The resin molded body may be taken out after completion of the temperature decrease. In this case, a process may be included in which soft ferrite is disposed inside, outside, or on the top of the induction heating coil 33, and the surface temperature of the mold cavity 100c is increased to a predetermined temperature by providing an inclination of 10 ° C to 200 ° C. Good.

  As described above, in the electromagnetic induction heating type resin molding die 100 according to the present invention, since the induction heating coil cassette 30 is used, the location for easy local heating can be changed according to the shape of the resin molding and the like. Is possible. Further, since only the portion corresponding to this local heating is locally cooled, it is possible to minimize the cooling energy. Further, by changing the position setting of the induction heating coil 33 in accordance with the shape of the resin molded body, the same coil cassette 30 can be used for various molds, and the mold can be easily manufactured. Have. Further, by finely adjusting the gap between the metal part 40 to be heated and the coil cassette 30 for induction heating, or the gap between the coil holding plate 31 and each induction heating coil 33, the temperature is increased by local heating on the surface of the mold cavity 100c. There is also an advantage that it is possible to impart an inclination. In addition, there is an advantage that the temperature of the local heating can be controlled also by arranging ferrite as a magnetic material in the vicinity of the induction heating coil in order to concentrate the magnetic flux.

DESCRIPTION OF SYMBOLS 100 Electromagnetic induction heating type resin molding die 20 Coil / cassette storage part 30 Coil / cassette 31 Coil holding plate 32 Coil / cassette mounting screw 33 Induction heating coil 34 Induction heating coil mounting screw 40 Heated metal part 50 Cooling hole

Next, as a mold for resin molding using high frequency electromagnetic induction as a heating means, JP 2012-214040 discloses that a cavity surface is formed in two molds constituting a mold, and a magnetic metal is formed in each part having the cavity surface. An electromagnetic induction heating mold apparatus for resin molding is disclosed in which a portion is arranged and a plurality of induction coils are arranged on the outer surface of the magnetic metal portion within a predetermined range from the outer peripheral edge of the cavity. However, even in this configuration, an induction coil must be provided for each mold, and the configuration is not limited to the electromagnetic induction local heating by the cassette type coil but the electromagnetic induction full surface heating, and the local cooling is not the local cooling. Such a configuration tends to waste heating / cooling energy. Furthermore, since the induction coil is disposed with a fixed gap from the outer peripheral edge of the cavity, it has a drawback that it is difficult to impart a temperature gradient to each part of the mold cavity surface.

Finally, JP-A-2013-226810 discloses a resin molded body that stably reduces the time required in a continuous resin molded body manufacturing cycle using an electromagnetic induction heating mold having a configuration similar to that of the above reference. A manufacturing method is disclosed. However, the electromagnetic induction heating mold used here has not yet reached the technical idea of local heating and the formation of a heating coil cassette as described above. Have.

Claims (11)

Electromagnetic induction heating type resin molding die used in the resin molding machine of the electromagnetic induction heating type resin molding apparatus (1) constituted by the resin molding machine (200), the electromagnetic induction heating device (300) and the cooling mechanism (400) 100);
A coil cassette (30) for local induction heating comprising a coil holding plate (31) and one or more induction heating coils (33) attached to the coil holding plate; In the coil / cassette housing part (20), the metal part (40) is easily attached and detached, and the metal part to be heated is heated by temperature gradient by local heating with a predetermined high-frequency power controlled by the electromagnetic induction heating device. Configured to:
Further, a plurality of cooling holes (50) through which the cooling medium from the cooling mechanism flows are provided in the heated metal portion (40) between the coil cassette and the mold cavity surface, and are locally provided by the induction heating coil. An electromagnetic induction heating type resin molding die characterized in that a cooling medium is allowed to flow only in a cooling hole provided in the vicinity of a heated metal part to be heated and temperature gradient cooling is performed by local cooling.   An arbitrary number of induction heating coils (33) of the coil cassette (30) are arranged in the vicinity of a place where a molding defect is likely to occur, and can be freely repositioned on the coil holding plate (31). The electromagnetic induction heating type resin molding die according to claim 1, wherein:   The induction heating coil cassette (30) can be mounted and adjusted with an arbitrary gap from the heating surface of the metal part (40) to be heated in parallel or inclined to the metal part to be heated. 2. The electromagnetic induction heating type resin molding die according to claim 1, wherein the heating surface can be freely provided with a temperature gradient.   Each of the one or more induction heating coils (33) attached to the induction heating coil cassette (30) can be attached with an arbitrary gap from the coil holding plate (31), 2. The electromagnetic induction heating type resin molding die according to claim 1, wherein a temperature gradient is freely given to the heating surface by different gaps.   The induction heating coil (33) is made of a copper wire or a copper tube, and is arranged so that the gap with the heating surface of the heated metal portion (40) is 30 mm or less, and the inner radius R is 50 mm or less. The coil inner diameter portion is heated evenly, so that the coil inner diameter portion projection surface of the metal portion to be heated can be heated by temperature gradient by local heating without lowering the temperature. Electromagnetic induction heating type resin mold.   The coil holding plate (31) has a heat resistant temperature of 100 ° C. or higher, and is disposed between the heating surface of the metal part (40) to be heated and the induction heating coil (33), and has a thickness of 1 to 30 mm. The electromagnetic induction heating type resin molding die according to claim 1, which is configured to be capable of temperature gradient heating by local heating.   A plurality of soft ferrites are arranged inside, outside or above the induction heating coil (33) to control the magnetic flux, and if necessary, the electrical resistance is sufficiently low near the coil and the thickness is A copper plate or the like, which is a non-magnetic conductive material having a skin depth or more, is disposed to reduce the magnetic flux density and substantially magnetically shield a portion where the necessity for heating is low, thereby local to the heated metal portion (40). 2. The electromagnetic induction heating type resin molding die according to claim 1, wherein the heating temperature control is performed.   The size (outside diameter) of the induction heating coil (33) is changed to change the concentration level of the heating energy with respect to the heating site, thereby performing temperature control of local heating. 1. An electromagnetic induction heating type resin molding die according to 1.   2. The electromagnetic induction heating according to claim 1, wherein temperature of local heating is controlled by using an alloy having a different Curie temperature or a composite material thereof as a material of the metal part to be heated (40). Type resin molding mold. The mold cavity (100c) is heated by applying high-frequency electricity to the induction heating coil (33) from the electromagnetic induction heating device (300) with the electromagnetic induction heating resin molding die (100) according to claim 1 open. Then, temperature gradient heating by local heating to a predetermined temperature,
Fill the mold cavity with resin and maintain pressure,
After a predetermined time has passed, cooling is performed only on the cooling holes provided in the vicinity of the locally heated portion among the plurality of cooling holes (50) through which the cooling medium supplied from the cooling mechanism (400) connected to the mold flows. A method for producing a resin molded body, in which temperature gradient cooling is performed by local cooling by controlling the medium to flow, and the resin molded body is taken out after completion of temperature decrease.   In the temperature gradient heating step, soft ferrite and, if necessary, a metal having a low electrical resistance such as a copper plate is disposed in the vicinity of the coil inside or outside or above the induction heating coil (33), and the mold cavity The method for producing a resin molded body according to claim 10, comprising a step of raising the surface temperature of the resin to a predetermined temperature by providing an inclination of 10 ° C. to 200 ° C.