JP2014180759A - Metal part insert molding method for thermoplastic resin and mold for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the molding cycle and increase the heating efficiency in molding a metal part integrally with a thermoplastic resin and obtain a high-accuracy integrated molding stably.SOLUTION: A metal part insert molding method for a thermoplastic resin includes an insert step of inserting a metal part into a cavity 33 formed between a first mold 2 and a second mold 3, with the first mold 2 and/or the second mold 3 provided with an IH coil 35 or 65 and the first mold 2 provided with an elastic member 22 at a position in contact with a metal part 10 in the first mold 2, a mold clamping step of clamping the first and second molds, a resin supply step of supplying an unhardened thermosetting resin 45 into the cavity, a heating step of electrifying a current through the IH coil to heat the metal part itself or through an intervening member 70 composed of a ferromagnetic material so as to heat the metal part to a temperature equal to or higher than the hardening temperature of the thermosetting resin and a hardening step of hardening the thermosetting resin by heating the metal part. A mold for the molding is also provided.

Description

  TECHNICAL FIELD The present invention relates to a method for performing integral molding by inserting a metal part into a mold and supplying a thermosetting resin, and a mold used for the molding.

  In recent years, an integrated part of metal and resin has been widely used for a part of various products such as automobiles, electrical / electronic devices, daily necessities, or casings. For example, when manufacturing a composite product in which a metal part is inserted into a thermosetting resin, insert molding is performed in which the metal part is set in advance in a mold, and the thermosetting resin is injected into the mold. It has been broken. As a general method of the insert molding, a molding method in which a metal part is inserted into a mold after heating the mold in advance and a thermosetting resin is supplied thereto (referred to as “molding method 1”). , Insert a metal part into a mold having a preheated metal part inserted into a mold and supplying a thermosetting resin to the mold ("molding method 2") or a mold provided with heating means, A molding method (“molding method 3”) is known in which a metal part is heated using heat from a mold heated by a heating means, and a thermosetting resin is supplied thereto. For example, Patent Documents 1 to 7 disclose molds equipped with heating means suitably used for the molding method 1 or the molding method 3.

JP-A-5-185472 JP 2006-35617 A JP 2005-335234 A JP 2006-315259 A JP 2001-300999 A Japanese Patent Laying-Open No. 2005-179084 Japanese National Patent Publication No. 11-502781

  However, the conventional molding methods 1 to 3 have the following problems. First, in the case of the molding method 1, the metal part needs to be heated to the curing temperature of the resin by heat conduction from the mold. For this reason, the heating time of a metal component becomes long and productivity falls. Also, because the mold is heated, it is difficult to lay an elastic member between the metal part and the mold to cope with the thickness variation of each metal part. In addition to the problem of the occurrence of burrs due to this, the yield of the product is deteriorated, and there is also a problem that the inside of the mold remains in contact with the metal part.

  In the case of the molding method 2, since it is necessary to preheat the metal part to the curing temperature of the resin, there is a problem that the curing speed of the resin in contact with the metal part is too high and the flow length of the resin is shortened. For this reason, when thin-walled molding is performed, there is a high possibility that the resin will not spread sufficiently. In addition, as in the molding method 1, there is a problem in that an elastic member cannot be used, and burrs are generated or a mold mark remains.

  In the case of the molding method 3, in addition to the same problem as the molding method 1, it is necessary to heat and control the entire mold. Since metal parts are indirectly heated from a heating means through a mold, there is a problem that heating efficiency is lowered.

  The present invention has been made to solve the above-described problems, and aims to shorten the molding cycle, increase the heating efficiency, and stably obtain a highly accurate integrally molded product.

  In order to achieve the above-mentioned object, the present inventors have earnestly studied a method for rapidly heating a metal part after supplying the resin to the metal part in a state below the curing temperature of the resin, and completed the present invention. It was. Specific problem solving means are as follows.

  A metal part insert molding method of a thermosetting resin according to an embodiment for achieving the above object is a method of inserting a metal part into a mold and integrally molding with the thermosetting resin, The first mold and / or the second mold constituting the same includes an IH coil, the first mold includes an elastic member at a portion in contact with the metal part, and the first mold and the second mold An insert process for inserting metal parts into the cavity formed between the molds, a mold clamping process for clamping the first mold and the second mold, and supplying an uncured thermosetting resin into the cavity A resin supplying step, an electric current is passed through the IH coil, and the metal part itself or an intervening member mainly made of a ferromagnetic material in contact with the metal part is heated by electromagnetic induction to heat the metal part to the curing temperature of the thermosetting resin or Heating to the above temperature Including a degree, and a curing step of curing the thermosetting resin by heating metal parts.

  Moreover, the metal part insert molding method of thermosetting resin according to another embodiment further includes a first mold and an IH coil with a space or a nonmagnetic material interposed between the IH coil and the metal part. In the heating step, a metal part made of a magnetic material is directly heated by electromagnetic induction.

  The thermosetting resin metal part insert molding method according to another embodiment also includes a first mold inside the IH coil and / or a distance between the IH coil and the metal part made of a magnetic material. The first mold and / or the second mold is provided so as to increase the distance from the second mold, and in the heating process, the IH coil is used to provide the first mold and / or the second mold provided with the IH coil. Is also a method of heating electromagnetically preferentially metal parts.

  The thermosetting resin metal part insert molding method according to another embodiment is also provided in the case where the metal part is made of a non-magnetic metal, and is interposed between the IH coil and the metal part at the time of the insert process or prior thereto. In the heating step, the member is arranged and the metal part is heated from the interposed member that is electromagnetically heated by the IH coil.

  The metal part insert molding method of thermosetting resin according to another embodiment is a method using silicone rubber as the thermosetting resin.

  Further, an insert molding die according to an embodiment of the present invention is a mold that can be used for insert molding in which a metal part is inserted and integrally molded with a thermosetting resin. A second mold, a cavity for setting a metal part between the first mold and the second mold, an IH coil in the first mold and / or the second mold, The first mold or the second mold is provided with a resin supply path for supplying an uncured thermosetting resin to the cavity. The first mold is provided with an elastic member at a portion in contact with the metal part, and the IH coil Gold that allows the metal part to be heated up to the curing temperature of the thermosetting resin or higher by electromagnetic induction heating of the metal part itself or an intermediate member mainly made of a ferromagnetic material in contact with the metal part by passing an electric current. It is a type.

  The mold for insert molding according to another embodiment further includes a first mold and / or a second mold by interposing a space between the IH coil and the metal part or a nonmagnetic material. In this case, the metal part made of a magnetic material can be directly heated by electromagnetic induction.

  Further, the insert molding die according to another embodiment includes a first die and / or a second die that are inward of the IH coil from the distance between the IH coil and the metal part made of a magnetic material. The first metal mold and / or the second metal mold is provided so as to increase the distance between the first metal mold and / or the second metal mold. A mold that can be heated.

  In another embodiment of the mold for insert molding, an interposition member is disposed between the IH coil and the metal part, and the metal part made of a nonmagnetic metal is electromagnetically heated by the IH coil. It is the metal mold | die which can be heated from a member.

  According to the present invention, when integrally molding a metal part and a thermosetting resin, a molding cycle can be shortened, heating efficiency can be improved, and a highly accurate integrally molded product can be stably obtained.

FIG. 1 shows a side cross-section (A) of a mold for insert molding according to the first embodiment of the present invention and an upper surface (B) of a second mold constituting the mold. FIG. 2 shows a flowchart of the main steps of the thermosetting resin metal part insert molding method according to the first embodiment of the present invention. FIG. 3 shows the situation from step S101 to S102 in FIG. FIG. 4 shows the situation in step S103 of FIG. FIG. 5 shows the situation from step S104 to S105 in FIG. FIG. 6 schematically shows a mechanism for heating a metal part by passing a current through the IH coil of FIG. FIG. 7 shows the situation in step S106 of FIG. FIG. 8 shows a side cross-section of a mold for insert molding according to the second embodiment of the present invention. FIG. 9 shows a side cross section of a mold for insert molding according to the third embodiment of the present invention.

  Embodiments of a thermosetting resin metal part insert molding method and insert molding die according to the present invention will be described below with reference to the drawings. Hereinafter, the structure of the mold and the molding method using the mold will be described in the same embodiment.

<First embodiment>
FIG. 1 shows a side cross-section (A) of a mold for insert molding according to the first embodiment of the present invention and an upper surface (B) of a second mold constituting the mold.

  A mold for insert molding (hereinafter simply referred to as “mold”) 1 according to the first embodiment includes a first mold 2 and a second mold 3. In this embodiment, the first mold 2 and the second mold 3 are made of a nonmagnetic metal, preferably aluminum, an aluminum alloy, or nonmagnetic stainless steel. However, the first mold 2 and the second mold 3 may be composed of the nonmagnetic metal only around the molding part and the other may be composed of a ferromagnetic metal such as iron or tungsten steel.

  In this embodiment, a metal part 10 made of a magnetic material typified by iron or IH stainless steel is used as an insert part for insert molding using the mold 1. However, a part made of a nonmagnetic metal can be used as the metal part 10 under the situation of the third embodiment described later. The metal part 10 includes a thin concave portion 11 on the upper surface thereof. The recess 11 corresponds to a portion for supplying resin.

  The first mold 2 has a ring-shaped resin supply port 20 on its upper surface and a resin supply path 21 that penetrates from the resin supply port 20 in the thickness direction of the first mold 2. The first mold 2 has a thin concave portion on the surface (lower surface) facing the second mold 3, and an elastic member 22 is fixed to the concave portion. The elastic member 22 has a through-hole penetrating the resin supply path 21 so that the resin flowing from the resin supply port 20 through the resin supply path 21 can be passed through the elastic member 22 in the thickness direction. It is configured. The elastic member 22 is a non-magnetic material, and is preferably composed of a material that is lower in hardness and rich in elasticity than the insert part (= metal part 10). Even if the thickness of the metal part 10 varies, the elastic member 22 has a function of absorbing the variation and preventing a gap between the upper surface of the metal part 10 and the elastic member 22. As the elastic member 22, a resin material typified by polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polyether imide (PEI), polyamide imide (PAI) or the like can be suitably used.

  The 2nd metal mold | die 3 has the structure which laminated | stacked the upper member 30, the heat insulation board 31, and the lower member 32 in order. The heat insulating plate 31 is made of a material that is different from the upper member 30 and the lower member 32 and has a high heat insulating property, and has a function of shielding heat from the upper member 30 having a molded portion and making it difficult to transmit to the lower member 32. Have. The upper member 30 includes a cavity 33 serving as a molding portion that is open on the upper surface facing the first mold 2. The cavity 33 is a recess in which the metal part 10 can be placed. In this embodiment, the cavity 33 is provided only in the second mold 3, but if the cavity 33 is provided between the first mold 2 and the second mold 3, only the first mold 2 is provided. Alternatively, both the first mold 2 and the second mold 3 may be provided. The upper member 30 includes a plurality of recesses 34 that are recessed from the bottom surface of the cavity 33 toward the inside (also referred to as the lower side) of the upper member 30. In this embodiment, as shown in FIG. 1B, two concave portions 34 are formed in a concentric rectangular shape below the bottom surface of the cavity 33 when viewed from the opening surface side of the cavity 33. However, the shape and number of the recesses 34 are not limited to this embodiment. An IH coil 35 is disposed in the vicinity of the opening of the recess 34 and within a range that does not protrude from the bottom surface of the cavity 33. The IH coil 35 is fixed in the recess 34 by a fixing material (not shown) such as high heat resistant resin, glass fiber, nonmagnetic metal such as aluminum, or ceramics. The fixing material is preferably provided in the recess 34 so as to fit in a gap between the side wall of the recess 34 and the IH coil 35. However, the fixing material may be provided so as to contact not only the side wall of the recess 34 but also the bottom of the recess 34. When a current flows under the control of an IH inverter (not shown) arranged outside the mold 1, the IH coil 35 is concentric with the direction of current flow and follows the rotation direction of the clock hands. Generate magnetic field lines. As a result, an eddy current is generated in the metal component 10 disposed in the vicinity of the IH coil 35, and the metal component 10 generates heat.

  The upper member 30 includes two through-holes 36 that penetrate from the bottom surface of the cavity 33 in the thickness direction of the upper member 30 at a position different from the concave portion 34. The heat insulating plate 31 is also provided with two through holes 31 a penetrating in the thickness direction of the heat insulating plate 31 at the positions of the through holes 36. The lower member 32 is provided with a recess 37 on the upper surface side facing the heat insulating plate 31. In the recess 37, an extrusion member 38 for extruding the molded product from the cavity 33 is disposed. The push-out member 38 includes two rods 39 and is disposed in the recess 37 in a state where each rod 39 is inserted into each through hole 36. The extruded member 38 is not particularly limited with respect to its constituent material, and is preferably composed of a ferromagnetic metal, a nonmagnetic metal, a ceramic material, or a carbon material. The rod 39 constitutes a part of the extrusion member 38 and can be made of a ferromagnetic metal, a nonmagnetic metal, a ceramic material, or a carbon material, but is preferably made of a material other than the ferromagnetic material so as not to generate heat by the IH coil 35. Configured. The lower member 32 includes a through hole 40 that penetrates from the lower surface to the recess 37. After molding, when a driving member (not shown) is inserted into the through hole 40 and the pushing member 38 is pushed toward the cavity 33, the two rods 39 move the molded product in the cavity 33 toward the opening direction of the cavity 33. Can be pushed out. Note that the number of the through holes 36 and the number of the rods 39 are not limited to two, but can be one or three or more.

  Thus, the mold 1 can be used for insert molding in which the metal component 10 is inserted and integrally molded with the thermosetting resin, and includes the first mold 2 and the second mold 3, and the first mold A cavity 33 for setting the metal part 10 is provided between the mold 2 and the second mold 3, an IH coil 35 is provided in the second mold 3, and unhardened heat is provided in the first mold 2. A resin supply path 21 for supplying a curable resin to the cavity 33 is provided. The first mold 2 is provided with an elastic member 22 at a portion in contact with the metal part 10, and a current is passed through the IH coil 35 so that the metal part 10 itself Is heated by electromagnetic induction so that the metal part 10 can be heated to the curing temperature of the thermosetting resin or higher. In particular, the mold 1 is provided with the IH coil 35 in the second mold 3 with a space between the metal part 10 and the metal part 10 made of a magnetic material can be directly heated by electromagnetic induction. Is.

  FIG. 2 shows a flowchart of the main steps of the thermosetting resin metal part insert molding method according to the first embodiment of the present invention. FIG. 3 shows the situation from step S101 to S102 in FIG. FIG. 4 shows the situation in step S103 of FIG. FIG. 5 shows the situation from step S104 to S105 in FIG. FIG. 6 schematically shows a mechanism for heating a metal part by passing a current through the IH coil of FIG. FIG. 7 shows the situation in step S106 of FIG.

  The thermosetting resin metal part insert molding method according to the first embodiment of the present invention mainly includes steps S101 to S106 shown in FIG. Hereinafter, each process will be described with reference to FIGS.

(1) Step S101 (insert process)
Step S <b> 101 is an insert process for inserting the metal component 10 into the cavity 33 formed between the first mold 2 and the second mold 3. Specifically, the metal component 10 is inserted into the cavity 33 formed in the second mold 3 with the recess 11 facing the first mold 2.

(2) Step S102 (Clamping process)
Step S <b> 102 is a mold clamping process for clamping the first mold 2 and the second mold 3. Specifically, after step S101, the first mold 2 is placed on the second mold 3 and fastened to each other with a predetermined pressure. After the mold clamping, the mold 1 and the metal component 10 inside the mold 1 are in a situation as shown in FIG.

(3) Step S103 (resin supply process)
Step S <b> 103 is a resin supply process for supplying the uncured thermosetting resin 45 into the cavity 33. Specifically, as shown in FIG. 4, the uncured thermosetting resin 45 is recessed from the metal part 10 in the cavity 33 through the resin supply path 21 from the resin supply port 20 of the first mold 2. Pour towards 11 The thermosetting resin 45 in this application includes phenol resin, urea resin, melamine resin, unsaturated polyester, alkyd resin, silicone resin, epoxy resin, urethane resin, polyvinyl ester, polyallyl phthalate, polyimide, bismaleimide / triazine resin, furan. Resins such as resin, xylene resin, guanamine resin, malein resin or dicyclopentadiene resin, silicone rubber, urethane rubber, isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, butyl rubber, ethylene propylene diene rubber, acrylic rubber Or it is interpreted in a broad sense to include thermosetting rubber materials such as fluoro rubber. In particular, it is preferable to use silicone rubber as the thermosetting resin.

(4) Step S104 (heating process)
Step S104 is a heating process in which a current is passed through the IH coil 35 to heat the metal part 10 itself to electromagnetic induction heating to heat the metal part 10 to a curing temperature of the thermosetting resin 45 or higher. As shown in FIG. 5, when a current is passed through the IH coil 35, an eddy current 46 is generated in the metal part 10. The eddy current 46 is merely drawn in FIG. 5 for easy viewing, and does not necessarily match the actual generation state. As a result of the eddy current 46 being generated in the metal part 10, the metal part 10 generates heat. Here, when the second mold 3 is made of a ferromagnetic material in particular, the distance (interval L1) from the IH coil 35 to the metal part 10 is the distance from the IH coil 35 to the bottom of the recess 34. It is preferable that the distance is shorter than (interval L2) and the second mold 3 is not easily heated by the IH coil 35. Thereby, the metal component 10 can be heated preferentially with respect to the mold 1.

  The mechanism of such electromagnetic induction heating is as shown in FIG. That is, when a current is passed through the coil 51 (current is assumed to flow in either the front or back direction of the paper surface), magnetic lines of force 52 are generated around the coil 51. As a result, an eddy current 53 is generated inside the magnetic body 50 in contact with the magnetic force lines 52. Then, the magnetic body 50 generates heat due to the eddy current 53.

(5) Step S105 (curing process)
Step S <b> 105 is a curing step for curing the thermosetting resin 45 as the metal component 10 is heated. When the metal part 10 rapidly generates heat in step S104, the thermosetting resin 45 that has received the heat is cured. As described above, when the IH coil 35 is used, the metal component 10 made of a magnetic material can be directly heated without using the mold 1, and the thermosetting resin 45 can be cured using the heat. For this reason, compared with the case where a heater etc. are arrange | positioned and heated to the metal mold | die 1, it becomes possible to heat and shape | mold in a short time. Moreover, since the metal component 10 can be heated after pouring the uncured thermosetting resin 45 into the cavity 33, the thermosetting resin 45 can be cured after sufficiently flowing into a predetermined portion. Therefore, it is possible to prevent such a problem that the thermosetting resin 45 is cured before flowing.

(6) Step S106 (removal process)
Step S <b> 106 is an extraction process for taking out the molded body 60 from the cavity 33 after molding. Specifically, as shown in FIG. 7, the driving member is inserted from the through hole 40 and the pushing member 38 is pushed, and the molded body 60 (the metal part 10 and the cured resin 45 a in the recess 11 is integrated with each other through the rod 39. The molded product) is extruded from the cavity 33. The cured resin 45 a in the first mold 2 and the cured resin 45 a of the molded body 60 can be cut when the first mold 2 is separated from the molded body 60.

  As described above, the metal part insert molding method of the thermosetting resin according to this embodiment is a method in which the metal part 10 is inserted into the mold 1 and integrally molded with the thermosetting resin 45. The second mold 3 constituting the same includes an IH coil 35, and the first mold 2 includes an elastic member 22 at a portion in contact with the metal component 10. The first mold 2, the second mold 3, An insert process (step S101) for inserting the metal part 10 into the cavity 33 formed between the molds, a mold clamping process (step S102) for clamping the first mold 2 and the second mold 3, and a cavity. A resin supplying step (step S103) for supplying an uncured thermosetting resin 45 into the inside 33, and a current is passed through the IH coil 35 to heat the metal component 10 itself by electromagnetic induction, thereby thermosetting the metal component 10. Of functional resin 45 The degree or heating step of heating to higher temperatures (step S104), and comprising a curing step of curing the thermosetting resin 45 by heating the metal component 10 (step S105). In particular, the IH coil 35 is provided in the second mold 3 with a space between the metal part 10 and in the heating step (step S104), the metal part 10 made of a magnetic material is directly heated by electromagnetic induction. . For this reason, the metal component 10 can be directly heated in a situation where the mold 1 is not heated or is difficult to heat. For this reason, after pouring the thermosetting resin 45 into a predetermined portion (here, the recess 11) of the metal part 10, current can be passed through the IH coil 35 to perform integral molding. Moreover, according to such electromagnetic induction heating, the metal part 10 can be heated rapidly, so that the molding cycle can be shortened.

  Further, the IH coil 35 is provided in the second mold 3 so that the distance L2 between the IH coil 35 and the inner second mold 3 is larger than the distance L1 between the metal part 10 made of a magnetic material. In the heating process (step S104), the metal component 10 can be electromagnetically heated by the IH coil 35 more preferentially than the second mold 3 including the coil. For this reason, even if it uses the metal mold | die 1 which consists of a magnetic metal (especially ferromagnetic metal), the heat transfer to the metal mold | die 1 can be suppressed.

<Second embodiment>
Next, a second embodiment of a thermosetting resin metal part insert molding method and insert molding die according to the present invention will be described. Since the molding method in this embodiment includes the respective steps shown in FIG. 2 as in the first embodiment, the duplicate description thereof is omitted. Moreover, in the metal mold | die which concerns on 2nd embodiment, about the part which is common in the metal mold | die which concerns on 1st embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

  FIG. 8 shows a side cross-section of a mold for insert molding according to the second embodiment of the present invention.

  The mold 1 according to the second embodiment is different from the first embodiment in that the first mold 2 includes an IH coil 65. The first mold 2 includes a plurality of recesses 64 that are open toward the elastic member 22 and are recessed inwardly above the elastic member 22. Each recess 64 is formed in the first mold 2 so as to face the opening surface of the cavity 33, avoiding the position of the resin supply path 21. Each recess 64 includes an IH coil 65 at a position close to the opening side. The IH coil 65 may be provided in the recess 64 in contact with the elastic member 22 or in a non-contact state. When the IH coil 65 is not in contact with the elastic member 22, the IH coil 65 is fixed to the concave portion 64 so that a space is interposed between the IH coil 65 and the elastic member 22. In addition, the distance from the IH coil 65 to the closed top surface of each recess 64 is preferably long enough not to heat the first mold 2 excessively.

  As described above, the mold 1 according to the second embodiment includes the first mold 2 and the second mold 3, and includes the cavity 33 for setting the metal component 10 on the second mold 3 side. The IH coil 65 is provided on the first mold 2 side, the first mold 2 is provided with a resin supply path 21 for supplying the uncured thermosetting resin 45 to the cavity 33, and the first mold 2 includes The elastic member 22 is provided at a portion in contact with the metal component 10, current is passed through the IH coil 65, the metal component 10 itself is heated by electromagnetic induction, and the metal component 10 is cured at a temperature equal to or higher than the curing temperature of the thermosetting resin 45. It can be heated up to. In particular, the IH coil 65 is provided in the first mold 2 with at least the elastic member 22 among the elastic member 22 made of a space and a nonmagnetic material between the IH coil 65 and the metal component 10, and is made of a magnetic material. 10 is directly heated by electromagnetic induction. For this reason, after pouring the thermosetting resin 45 into the concave portion 11 of the metal part 10, current can be passed through the IH coil 65 to perform integral molding. Moreover, according to such electromagnetic induction heating, the metal part 10 can be heated rapidly, so that the molding cycle can be shortened.

  Further, the distance from the IH coil 65 to the closed top surface of the recess 64 is longer than the distance from the IH coil 65 to the metal part 10. That is, the IH coil 65 is the first mold so that the distance between the IH coil 65 and the first inner mold 2 is larger than the distance between the IH coil 65 and the metal part 10 made of a magnetic material. 2 is provided. For this reason, the metal component 10 can be preferentially electromagnetically heated by the IH coil 65 as compared with the first mold 2 having the IH coil 65. For this reason, even if it uses the metal mold | die 1 which consists of a magnetic metal (especially ferromagnetic metal), the heat transfer to the metal mold | die 1 can be suppressed.

<Third embodiment>
Next, a third embodiment of a thermosetting resin metal part insert molding method and insert molding die according to the present invention will be described. Since the molding method in this embodiment includes the respective steps shown in FIG. 2 as in the first embodiment, the duplicate description thereof is omitted. Moreover, in the metal mold | die which concerns on 3rd embodiment, about the part which is common in the metal mold | die which concerns on 1st embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

  FIG. 9 shows a side cross section of a mold for insert molding according to the third embodiment of the present invention.

  The mold 1 according to the third embodiment is different from the first embodiment in that an interposed member 70 is provided between the IH coil 35 provided in the second mold 3 and the metal part 10. The interposition member 70 is mainly composed of a ferromagnetic material. The interposition member 70 is disposed in the recess 34 so as to cover the top of the IH coil 35 from the opening surface side of the recess 34. The upper surface of the interposition member 70 that covers the IH coil 35 preferably also serves as the bottom surface of the cavity 33. For this reason, the metal component 10 is disposed in the cavity 33 with its bottom in contact with the interposed member 70. The intervening member 70 generates an eddy current due to the current flowing through the IH coil 35 and heats itself. For this reason, even when a component made of a non-magnetic metal is used as the metal component 10, it takes a slightly longer time than the case where the metal component 10 itself generates heat, but the metal component 10 can be made in a shorter time than before. Can be heated.

<Other embodiments>
As mentioned above, although each embodiment of the present invention was described, the present invention is not limited to each above-mentioned embodiment, and various changes are possible.

  In the first embodiment described above, the metal part 10 is inserted into the cavity 33 with the recess 34 opened. However, a member made of glass, aluminum, or the like at the bottom of the cavity 33 so as to close the opening surface of the recess 34. May be arranged, and a current is passed through the IH coil 35 in a state where the member is interposed between the IH coil 35 and the metal part 10 to cause the metal part 10 to generate heat. In other words, the metal component 10 can be heated by the IH coil 35 with either air or a member made of a nonmagnetic material interposed. The member made of the nonmagnetic material has a function of preventing deformation or breakage because the metal part 10 is particularly thin and cannot withstand the resin pressure at the time of molding. On the other hand, when the metal part 10 is thin and made of a non-magnetic material, the interposition member 70 described in the third embodiment is provided between the IH coil 35 and the metal part 10 so that the resin pressure during molding is increased. The metal component 10 can be heated by the heat generated by the interposition member 70.

  In the second embodiment described above, the IH coil 65 is provided on the first mold 2 side. In addition to this, the IH coil 35 is provided on the second mold 3 side, and both the metal parts 10 are provided. The IH coils 35 and 65 may generate heat.

  The mold 1 is preferably formed of a non-magnetic material that does not generate heat due to the energization of the IH coils 35 and 65, but may include a magnetic material (for example, a ferromagnetic material) at a predetermined portion. good. For example, the main part of the mold 1 may be formed of a magnetic material, and the periphery of the cavity 33, particularly the periphery of the IH coils 35 and 65, may be configured of a nonmagnetic material. In such a configuration, when the metal part 10 made of a magnetic material is heated, excessive heat generation of the mold 1 can be suppressed. On the other hand, as described in the third embodiment, when insert molding is performed using the metal component 10 made of a non-magnetic material, the metal component 10 cannot be heated by energization of the IH coil 35. It is preferable to use a method in which a ferromagnetic material such as 70 that can be separately installed in the cavity 33 is prepared, or the periphery of the cavity 33 is formed in a non-separable manner by a member mainly made of a ferromagnetic material. When such a method is used, the metal part 10 is indirectly heated. However, the main part of the mold 1 is not heated and only the periphery of the cavity 33 is heated. There is no heating.

  The present invention can be used for integral molding of a metal and a thermosetting resin.

1 Mold 2 First mold 3 Second mold 10 Metal part 21 Resin supply path 22 Elastic member 33 Cavity 35 IH coil 45 Thermosetting resin (silicone rubber is an example)
65 IH coil 70 Interposition member

Claims (9)

A metal part insert molding method of a thermosetting resin, in which a metal part is inserted into a mold and integrally molded with a thermosetting resin,
The mold includes an IH coil in the first mold and / or the second mold constituting the mold, and an elastic member in a portion in contact with the metal component in the first mold,
An insert step of inserting the metal part into a cavity formed between the first mold and the second mold;
A mold clamping step of clamping the first mold and the second mold;
A resin supplying step of supplying an uncured thermosetting resin into the cavity;
By passing an electric current through the IH coil, the metal part itself or an intervening member mainly made of a ferromagnetic material in contact with the metal part is heated by electromagnetic induction, and the metal part is heated at a temperature equal to or higher than the curing temperature of the thermosetting resin. A heating step of heating to a temperature of
A curing step of curing the thermosetting resin by heating the metal parts;
A thermosetting resin metal part insert molding method comprising: The IH coil is provided in the first mold and / or the second mold with a space or a nonmagnetic material interposed between the IH coil and the metal part,
2. The thermosetting resin metal part insert molding method according to claim 1, wherein in the heating step, the metal part made of a magnetic material is directly heated by electromagnetic induction. The first IH coil is configured such that a distance between the first mold and / or the second mold inside the IH coil is larger than a distance between the IH coil and the metal part made of a magnetic material. Provided in the mold and / or the second mold,
3. The heating process of claim 1, wherein the IH coil heats the metal part preferentially by electromagnetic induction over the first mold and / or the second mold including the IH coil. The metal part insert molding method of thermosetting resin as described in 2. In the case where the metal part is composed of a nonmagnetic metal,
Prior to or during the insertion step, the interposition member is disposed between the IH coil and the metal part,
2. The thermosetting resin metal part insert molding method according to claim 1, wherein in the heating step, the metal part is heated from the interposed member that is electromagnetically heated by the IH coil.   The thermosetting resin metal part insert molding method according to any one of claims 1 to 4, wherein the thermosetting resin is silicone rubber. A mold that can be used for insert molding in which a metal part is inserted and integrally molded with a thermosetting resin,
A first mold and a second mold;
A cavity for setting the metal part is provided between the first mold and the second mold,
The first mold and / or the second mold includes an IH coil,
The first mold or the second mold includes a resin supply path that supplies the uncured thermosetting resin to the cavity.
The first mold includes an elastic member at a portion in contact with the metal part,
By passing an electric current through the IH coil, the metal part itself or an intervening member mainly made of a ferromagnetic material in contact with the metal part is heated by electromagnetic induction, and the metal part is heated at a temperature equal to or higher than the curing temperature of the thermosetting resin. Mold for insert molding that can be heated up to the temperature of.   The IH coil is provided in the first mold and / or the second mold with a space or a nonmagnetic material interposed between the metal part and the metal part made of a magnetic material. The mold for insert molding according to claim 6, wherein electromagnetic induction heating is performed directly. The first IH coil is configured such that a distance between the first mold and / or the second mold inside the IH coil is larger than a distance between the IH coil and the metal part made of a magnetic material. Provided in the mold and / or the second mold,
The insert molding according to claim 6 or 7, wherein the IH coil performs electromagnetic induction heating of the metal part more preferentially than the first mold and / or the second mold including the IH coil. Mold. Placing the interposition member between the IH coil and the metal part;
7. The mold for insert molding according to claim 6, wherein the metal part made of a non-magnetic metal is heated from the interposed member that is electromagnetically heated by the IH coil.

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