JP3741817B2 - Reaction injection molding method - Google Patents

Description

測定結果から、通電による巻線コイルの温度管理は、巻線コイルの製作誤差を考慮しても±５％程度の範囲内に制御可能であり、樹脂成形時の予熱温度の管理手法として十分な精度を有していることが確認できた。
【００７５】
なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づいて種々の変形が可能であり、これらを本発明の範囲から排除するものではない。
【００７６】
【発明の効果】
以上、詳細に説明したように、本発明によれば、次のような効果を奏することができる。
【００７７】
（Ａ）本発明に係る反応射出成形によれば、金型のみでなく、金型内に挿入された挿入体の温度制御も可能となるため、挿入体と接する部分での反応も良好に進み、挿入体と樹脂との密着性が良好になる。また、金型を閉じた後でも、挿入体の温度を一定に制御することが可能になることから、常に一定品質の反応射出成形品を得ることができる。
【００７８】
（Ｂ）従来の導電コイルの加熱設備と比較し、簡易、かつ、短時間で予熱処理が可能である。
【００７９】
（Ｃ）通電時の両端電圧を管理するだけで、適正な予熱温度を精度良く確保することができる。
【００８０】
（Ｄ）成形用金型にセットした状態で通電加熱が可能であるため、従来の加熱方法と比較し、樹脂注入時の温度管理がし易く、成形品質の安定化を図ることができる。
【００８１】
（Ｅ）予熱設備から成形設備への導電コイルの移動が伴わないため、量産効率が良く、成形コストの低減が可能となる。
【図面の簡単な説明】
【図１】 本発明の実施例に係る反応射出成形に用いる装置の概略構成図である。
【図２】 図１に示す挿入体の斜視図である。
【図３】 図１に示す金型の斜視実施例である。
【図４】 本発明の他の実施例を示す導電コイルの予熱装置の概略構成図である。
【符号の説明】
２０ 挿入体
２０ａ 突出部分
２０ｂ 挿入本体
２２ 金型
２４ キャビティ
２５ 割面
２６ 金型本体
２７ 切欠
２８ 弾性部材
２９ 溝
３０ 可変電圧電源
３２ 電流計
３４ 配線
３６ 制御手段
１０１ 成形用金型
１０２ 導電体コイル
１０３ コイル口出し端子
１０４ 外部電源（通電用電源）
１０５ 電圧計
１０６ 通電用ケーブル（通電用電線）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reaction injection molding method, and more particularly to a reaction injection molding method for forming a molded body in which a part of an insert is exposed from a molded body by reaction injection molding.
[0002]
[Prior art]
The reaction injection molding (hereinafter also referred to as RIM) method is a manufacturing method in which two reaction stock solutions are mixed in a mixing chamber, fed into a mold cavity, and injection molding is performed while reacting in the mold. This RIM method is suitably used when a polymer (molded product) is molded from a norbornene monomer.
[0003]
For example, when a molded body in which a part of the metal insert is exposed from the molded body is to be molded by the RIM method, a part of the metal insert is exposed to the outside of the mold. As described above, the insert is arranged and the reaction injection molding is performed in the mold.
[0004]
[Problems to be solved by the invention]
However, in such reaction injection molding, the heat of reaction near the metal insert is absorbed by the metal insert, the resin cannot be cured sufficiently, and the metal insert and the resin do not adhere closely, The characteristics of the molded product may become unstable.
[0005]
In order to prevent such inconvenience, a method in which the metal insert is preheated and placed in a mold may be employed.
[0006]
However, in such a method, it is difficult to make the degree of heating constant, or if the molding is performed after a certain amount of time has passed after heating, the metal insert is cooled and the effect is lost. It has a problem. In addition, if the time after heating is not constant, the temperature of the metal insert will vary, and there is also a problem that a molded product of constant quality cannot be obtained.
[0007]
In addition, as shown in Japanese Patent Laid-Open No. 49-63953, there has been proposed a method for generating heat by energizing a metal insert during molding of a cured resin such as an epoxy resin. However, in this method, temperature control is possible. It was difficult to obtain a molded product of a certain quality.
[0008]
In particular, in reaction injection molding, it is necessary to promote the reaction well and be careful not to raise the temperature too much due to reaction heat. To obtain a high-quality molded product, temperature control in the mold is important. It was a great factor. However, with the conventional reaction injection molding technique, the temperature of the mold itself can be controlled, but there is no technique that enables even the temperature control of the insert disposed in the mold.
[0009]
In addition, winding coils, especially ground coils of magnetic levitation linear motors, are installed outdoors, so they must withstand severe environmental changes and the electromagnetic force repeatedly applied as vehicles pass. is there.
[0010]
The present invention has been made in view of such a situation, enables temperature control of an insert disposed in a mold, has good adhesion between the insert and resin, and has a constant quality reaction injection molded product It is an object of the present invention to provide a reaction injection molding method capable of producing
[0011]
[Means for Solving the Problems]
To achieve the above object, reaction injection molding method according to the present invention, the mold cavity, place the ground coils for maglev inductive repulsion system capable energized from the outside, the magnetic of the induction repulsive type The levitation-type railway ground coil is energized from the outside of the mold, and the resistance change due to the temperature change of the induction repulsion type magnetic levitation railway ground coil is detected, and according to the resistance change, the induction repulsion type The electric power supplied to the magnetic levitation railway ground coil is changed, and the reaction injection molding is performed in the mold while controlling the temperature of the induction repulsion magnetic levitation railway ground coil. is there.
[0012]
The reaction stock solution used for reaction injection molding is not particularly limited, and examples thereof include urethane-based, urea-based, nylon-based, epoxy-based, unsaturated polyester-based, phenol-based, and norbornene-based general molding conditions. The reaction stock solution temperature is 20 to 80 ° C., and the viscosity of the reaction stock solution is, for example, about 30 cps to 5 cps to 3000 cps, preferably about 100 cps to 1000 cps.
[0013]
In such molding, a reinforcing polymer (molded product) can be produced by placing a reinforcing material in a mold in advance and supplying a reaction liquid therein to polymerize it.
[0014]
Examples of the reinforcing material include glass fiber, aramid fiber, carbon fiber, ultra high molecular weight polyethylene fiber, metal fiber, polypropylene fiber, aluminum coated glass fiber, cotton, acrylic fiber, boron fiber, silicon carbide fiber, alumina fiber, and the like. be able to. However, in the case of induction repulsion type coils, non-conductive reinforcing materials such as glass fibers, aramid fibers, ultrahigh molecular weight polyethylene fibers, polypropylene fibers, cotton, acrylic fibers, boron fibers, silicon carbide fibers, alumina fibers, and the like are preferable.
[0015]
Furthermore, these reinforcing materials can be used in various shapes such as those obtained by matting long fiber or chopped strands, those woven into a cloth, and those having a chopped shape. Those reinforcing materials whose surfaces are treated with a coupling agent such as a silane coupling material are preferable for improving the adhesion to the resin. The blending amount is not particularly limited, but is usually 10% by weight or more, preferably 20 to 60% by weight with respect to the total amount of the reaction stock solution.
[0016]
In addition, by blending various additives such as antioxidants, fillers, pigments, colorants, foaming agents, flame retardants, sliding imparting agents, elastomers, dicyclopentadiene thermal polymerization resins and hydrogenated products thereof, The properties of the resulting polymer can be modified.
[0017]
As the antioxidant, there are various antioxidants for plastics and rubbers such as phenol, phosphorus and amine.
[0018]
Fillers include milled glass, carbon black, talc, calcium carbonate, aluminum hydroxide, mica, and whisker inorganic fillers such as potassium titanate and calcium sulfate. As the elastomer, natural rubber, polybutadiene, polyisoprene, styrene-butadiene copolymer (SBR), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), ethylene- Examples include propylene-dienta-polymer (EPDM), ethylene vinyl acetate copolymer (EVA), and hydrides thereof.
[0019]
The additive is usually mixed in advance with either or both of the reaction solutions.
[0020]
The mold body used for reaction injection molding does not necessarily have to be a high-rigid and expensive mold, and is not limited to a metal mold, and a resin mold or a simple mold can be used. This is because reaction injection molding can be performed at a relatively low temperature and low pressure using a low viscosity reaction liquid. The inside of the mold is preferably sealed with an inert gas, and the components used for the polymerization reaction are preferably stored and operated in an inert gas atmosphere such as nitrogen gas.
[0021]
The mold temperature is preferably 10 to 150 ° C, more preferably 30 to 120 ° C, and further preferably 50 to 100 ° C. The mold temperature can be controlled by providing a heat medium passage in the mold and circulating the heat medium. The mold pressure is usually in the range of 0.1 to 100 Kg / cm ² . The polymerization time may be appropriately selected, but is usually 30 seconds to 20 minutes after the completion of the injection of the reaction solution.
[0022]
In the present invention, the insert is not particularly limited as long as it can be energized. For example, a metal or conductive resistor such as a coil, a metal rod, a metal plate, or a metal mesh is used.
[0023]
The current or voltage flowing through the insert varies with the resistance of the insert. The resistance of the insert varies with the temperature of the insert. In a normal conductive insert, the higher the temperature, the higher the resistance value (positive characteristic), but there are some that the resistance value decreases as the temperature increases (negative characteristic). In any case, the resistance of the insert changes depending on the temperature of the insert.
[0024]
Therefore, by placing the insert inside the mold and closing the mold, power is supplied to the insert from the outside of the mold to generate heat, and the voltage or current applied to the insert is monitored. Thus, the resistance change of the insert can be detected, and the temperature of the insert can be predicted from the resistance change. If the power supplied to the insert is adjusted based on the predicted temperature of the insert, the temperature of the insert can be controlled.
[0025]
The temperature of the insert is preferably controlled to be about 10 to 150 ° C, more preferably about 30 to 120 ° C, and still more preferably about 50 to 100 ° C.
[0026]
In the reaction injection molding according to the present invention, not only the mold but also the temperature of the insert inserted into the mold can be controlled, so that the reaction at the portion in contact with the insert proceeds well, and the insert and resin Adhesion with is improved. Further, since the temperature of the insert can be controlled to be constant even after the mold is closed, a reaction injection molded product having a constant quality can be obtained at all times.
[0027]
Further, when the insert is a conductive coil, for example, an induction repulsion type magnetic levitation railway ground coil, since it can be energized and heated in a state where it is set in a molding die, the conventional heating method and In comparison, it is easy to control the temperature during resin injection, and the molding quality can be stabilized. Further, since there is no movement of the conductive coil from the preheating facility to the molding facility, the mass production efficiency is good and the molding cost can be reduced.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0029]
FIG. 1 is a schematic configuration diagram of an apparatus used for reaction injection molding according to an embodiment of the present invention, FIG. 2 is a perspective view of an insert shown in FIG. 1, and FIG. 3 is a perspective embodiment of a mold shown in FIG.
[0030]
As shown in FIGS. 1 and 3, the mold 22 according to this embodiment includes an upper mold and a lower mold, and the split surfaces 25 are combined to form a cavity 24 having a flat plate shape inside. Is to be formed. 1 and 3 show only the lower mold, the same applies to the upper mold.
[0031]
As shown in FIG. 3, the mold 22 of this embodiment includes a mold body 26 and an elastic member 28. The mold body 26 is not limited to a metal mold and is made of a rigid material such as a resin mold or a simple mold. A notch 27 is formed in the mold body 26 at a position where a protruding portion 20a (see FIG. 1) which is a part of the insert 20 shown in FIG. 2 is exposed to the outside of the mold. 27 is provided with an elastic member 28.
[0032]
The elastic member 28 is attached to the notch 27 so that the groove 29 is formed without filling the entire notch 27. The means for attaching the elastic member 28 to the notch 27 is not particularly limited, but a method using adhesion is preferable. The inner diameter of the groove 29 is set smaller than the outer diameter of the protruding portion 20a of the insert 20 shown in FIGS. For example, as shown in FIG. 1, in a state where the protruding portion 20a of the insert 20 is pressure-bonded in the groove 29 of the elastic member 28, the elastic member 28 is elastically compressed and deformed to about 0.3 to 3 mm in the radial direction. The size of the groove 29 is determined. The groove 29 may be formed by cutting or the like.
[0033]
In this embodiment, the elastic member 28 is made of a plate-like silicon rubber having excellent heat resistance. The thickness t (thickness between the groove 29 and the notch 27) of the elastic member 28 is preferably 3 mm or more, more preferably 5 mm or more, and particularly preferably 7 mm or more at the minimum portion. Moreover, the upper limit of the thickness becomes like this. Preferably it is 20 mm or less, More preferably, it is 15 mm or less. If the minimum thickness t is too thin, sufficient elasticity as the elastic member 28 may not be obtained, and if it is too thick, it is not preferable in terms of accuracy of the outer shape of the reaction injection molded body. The elastic member 28 is not particularly limited as long as it has an appropriate elasticity, is not affected by the reaction stock solution used for reaction injection molding, and does not fuse with the obtained molded body.
[0034]
2 includes an insertion body 20b and a protruding portion 20a. For example, the insertion body 20b includes a coil and the protruding portion 20a includes a terminal for the coil.
[0035]
The mold 22 is formed with a flow path for a heat medium (not shown) so that the mold 22 can be heated or cooled to a predetermined temperature.
[0036]
As shown in FIG. 1, a wiring 34 that can be connected to the protruding portion 20 a (terminal) of the insert 20 is disposed outside the mold 22. A variable voltage power supply 30 and an ammeter 32 are connected to the wiring 34 in series. The variable voltage power supply 30 is a device for supplying power to the insert 20 and is configured so that the applied voltage can be changed. The ammeter 32 can measure the current supplied to the insert 20.
[0037]
In this embodiment, the variable voltage power supply 30 is controlled by a control means 36 such as a computer.
[0038]
In the reaction injection molding, first, the insert 20 is installed in the mold 22. At that time, the protruding portion 20 a of the insert 20 is arranged so as to fit into the groove 29 of the mold 22. The mold 22 is closed, the wiring 34 and the protruding portion 20a of the insert 20 are connected, and the insert 20 is energized from the variable voltage power supply 30 to cause the insert 20 to generate heat.
[0039]
Simultaneously with the energization of the insert 20, the current flowing to the insert 20 is monitored by the ammeter 32. For example, in the case where the insert 20 is a positive resistor, the resistance increases when the temperature of the insert 20 exceeds a predetermined temperature, and the current measured by the ammeter 32 under the same voltage condition. Decreases. Therefore, in that case, a signal is sent from the ammeter 32 to the control means 36 to reduce the voltage applied from the variable voltage power supply 30. As a result, the power supplied to the insert 20 is reduced, and an excessive temperature rise of the insert 20 can be suppressed.
[0040]
In addition, when the temperature of the insert 20 is excessively lower than the predetermined temperature, the resistance of the insert 20 is reduced, so that the current detected by the ammeter 32 increases at the same voltage. Therefore, in that case, a signal is sent from the ammeter 32 to the control means 36 to increase the voltage applied from the variable voltage power supply 30. As a result, the power supplied to the insert 20 is increased, and an excessive temperature drop of the insert 20 can be suppressed. The relationship between the resistance value and the temperature in the insert 20 is measured in advance through experiments and the data is stored in the control means 36.
[0041]
Simultaneously with such temperature control of the insert 20, a reaction stock solution is injected into the cavity 24 from an injection port (not shown) to perform reaction injection molding.
[0042]
When the reaction injection molding is reaction injection molding using a norbornene monomer, the monomer used in this example is a norbornene ring such as dicyclopentadiene, dihydrodicyclopentadiene, tetracyclododecene, or tricyclopentadiene. Is a cycloolefin.
[0043]
Metathesis catalysts that can be used in reaction injection molding using norbornene-based monomers include organomolybdates such as tungsten hexachloride, tridodecylammonium molybdate, tri (tridecyl) ammonium molybdate, and organoammonium molybdates such as ammonium acid. Although it will not be restrict | limited especially if it is a well-known metathesis catalyst as a block polymerization catalyst of norbornene-type monomers, such as salt, A molybdate organic ammonium salt is preferable.
[0044]
Examples of the activator (cocatalyst) include alkylaluminum halides such as ethylaluminum dichloride and diethylaluminum chloride, organoaluminum compounds such as these alkoxyalkylaluminum halides, and organotin compounds.
[0045]
As a preparation for reaction injection molding, a reaction injection molding material mainly composed of a norbornene monomer, a metathesis catalyst and an activator is a liquid B composed of a norbornene monomer and a metathesis catalyst, the norbornene monomer and the activator. Divide into two stable liquids with liquid A and put them in separate tanks. At the time of reaction injection molding, these two liquids are mixed in a mixing chamber, and then this mixed liquid is injected into the cavity 24 of the mold and bulk polymerization is performed to obtain a molded product integrated with the insert 20. .
[0046]
At the time of reaction injection molding, the temperature of the mold 22 and the temperature of the insert 20 are preferably controlled to 10 to 150 ° C, more preferably 30 to 120 ° C, and still more preferably 50 to 100 ° C. Further, the clamping pressure between the mold 22 and the insert 20 is usually in the range of 0.1 to 100 Kg / cm ² . The polymerization time may be appropriately selected, but is usually 30 seconds to 20 minutes after the completion of the reaction liquid injection.
[0047]
In the reaction injection molding using the mold 22 according to the present embodiment, the protruding portion 20a which is a part of the insert 20 is exposed to the outside of the mold 22, and the protruding portion 20a of the insert 20 is the elastic member 28. And the reaction stock solution injected into the mold 22 is less likely to leak from the mold 22. Therefore, a high-quality molded product in which the insert 20 is integrated can be molded with few burrs and the like. In addition, in this embodiment, it is not necessary to replace the packing for each molding, the production yield is good, and the molding can be performed at a low cost.
[0048]
In the present embodiment, not only the mold 22 but also the temperature of the insert 20 inserted into the mold 22 can be controlled, so that the reaction at the portion in contact with the insert 20 proceeds well, and the insert The adhesion between the resin 20 and the resin is improved. Further, since the temperature of the insert 20 can be controlled to be constant even after the mold 22 is closed, a reaction injection molded product having a constant quality can always be obtained.
[0049]
For example, in the above-described embodiment, the mold of the portion with which the protruding portion 20a (terminal) of the insert 20 contacts is configured by the elastic member 28. However, in the present invention, this portion is not necessarily configured by the elastic member. Further, it can be molded integrally with the mold body 26.
[0050]
In the above-described embodiment, the current flowing through the insert 20 is monitored, and the variable voltage power supply 30 is used to adjust the power supplied to the insert 20. However, the present invention is not limited to this. Not. For example, the voltage applied to the insert 20 may be monitored and the electric power supplied to the insert 20 may be adjusted by the variable current power supply 30.
[0051]
Hereinafter, although the present invention will be described based on further specific examples, compared with reference examples, the present invention is not limited to these examples. In the following examples and reference examples, parts and% are based on weight unless otherwise specified.
・ Reference Example 1
A mold for forming a round bar having a diameter of 50 mm and a length of 500 mm was prepared. In addition, as an insert, an aluminum insert in which protruding portions having a diameter of 10 mm and a length of 50 mm were formed on both ends of an aluminum round bar having a diameter of 40 mm and a length of 500 mm was prepared.
[0052]
This insert was placed inside the mold, and the reaction stock solution was injected into the mold cavity to perform reaction injection molding.
[0053]
In the reaction injection molding, a narbornene monomer composed of 90% dicyclopentadiene (DCP) and 10% asymmetric cyclopentadiene trimer is placed in two containers, one of which is diethylaluminum chloride (DEAC) for the monomer. Was added to a molar concentration of 40 and 1,48-mol of 1,3-dichloro-2-propanol (dcPrOH) (solution A). On the other hand, tri (tridecyl) ammonium molybdate was added to the monomer so as to have a concentration of 10 mmol (liquid B). These A liquid and B liquid were stored in A tank and B tank, respectively.
[0054]
The temperature of the mold is set to 30 ° C by flowing warm water through the temperature control pipe installed inside the mold, and the same volume of liquid A and liquid B are mixed and injected into the mold cavity. After about 5 minutes, the reaction injection molded body in which the insert was integrated was taken out from the mold.
[0055]
When the protruding portion of the insert was pulled manually from the molded body, the insert was pulled out of the molded body. When the remaining resin was cut and the portion in contact with the insert was observed, the compounded solution remained unreacted.
[0056]
Except for the following method, a molded body in which the insert was integrated was molded in the same manner as in the reference example.
[0057]
Prior to placing the insert in the mold, the insert was heated to 50 ° C. with warm air.
[0058]
After that, the insert is placed in the mold, energized at a voltage of 100 volts from the protruding portion of the insert, and the resistance value of the insert becomes 8.3Ω while monitoring the current at that time, Then, electric power was supplied to the insert so that the temperature of the insert was maintained at 50 ° C., and reaction injection molding was performed in that state.
[0059]
In the obtained molded body, the protruding portion of the insert was manually pulled from the molded body, but could not be pulled out.
[0060]
According to the reaction injection molding according to the present invention, not only the mold but also the temperature of the insert inserted into the mold can be controlled, so that the reaction at the portion in contact with the insert proceeds well, and the insert Adhesion between the resin and the resin is improved. Further, since the temperature of the insert can be controlled to be constant even after the mold is closed, a reaction injection molded product having a constant quality can be obtained at all times.
[0061]
Next, another embodiment of the present invention will be described.
[0062]
A conductive coil, for example, a ground coil for a magnetically levitated railway of an induction repulsion system, needs to be laid over the entire track on which the levitated body travels, and a huge number are targeted. Therefore, in the manufacture of coils, it is required to ensure stable performance, increase mass production efficiency, and keep costs as low as possible.
[0063]
However, in the conventional technology, in the pre-heat treatment at the time of integral molding, it is difficult to control the temperature of the metal part that is the preheated product, and not only the molding quality varies, but also the movement of the coil from the preheating equipment to the molding equipment is involved. There was also a problem in terms of mass production efficiency.
[0064]
In this embodiment, a method for forming a conductive coil having excellent molding quality and high mass production efficiency by preheating such a magnetic levitation railway ground coil will be described.
[0065]
FIG. 4 is a schematic configuration diagram of a conductive coil preheating apparatus according to another embodiment of the present invention.
[0066]
Here, 101 is a molding die, 102 is a conductor coil, 103 is a coil lead terminal, 104 is an external power supply (power supply for energization), 105 is a voltmeter, and 106 is a cable for energization (wire for energization). In this embodiment, heat is supplied directly and uniformly from the external power supply (power supply for energization) 104 to the conductor coil 102 without using any special heating equipment.
[0067]
In addition, according to the preheating method of the conductive coil, the resistance coil using the property that the electrical resistance of the conductor is proportional to the temperature, that is, the conductor coil according to the following equations (1) and (2) The conductor coil 102 is preheated to the target temperature (t) by passing a constant current (I _s ) from the lead terminal portion 103 of 102 and measuring the voltage (V _c ) across the terminal portion with the voltmeter 105. Can do.
[0068]
R _t / R _T = (1 + αt) / (1 + αT) (1)
t = (1 / α) · (R _t / R _T ) · (1 + αT) −1
= (1 / α) · (1 / R _T ) · (V _C / I _s ) · (1 + αT) −1 (2)
Here, R _t is a resistance value at t degrees K, R _T is a resistance value at T degrees K, and α is a temperature coefficient of resistance depending on a conductor material.
[0069]
Further, according to the method for preheating a conductive coil of this embodiment, a molding metal is connected by connecting from an external power supply (power supply for energization) 104 to the lead terminal portion 103 of the conductor coil 102 via an energization cable 106. Pre-heat treatment can be performed with the conductor coil 102 set in the mold 101.
[0070]
As described above, according to the preheating device for the conductive coil shown in FIG. 4, the conductor coil 102 integrally molded with the molding resin is preheated, and the coil lead terminal 103 of the conductor coil 102 is energized. The power supply 104 for energization can be connected from the outside via the electric wire 106.
[0071]
The energization current may be direct current or alternating current.
[0072]
The means for heating the conductor coil 102 by energizing the coil lead terminal 103 of the conductor coil 102 from the external energizing power source 104 via the energizing wire 106 is the same, but the conductor coil 102 is the same. The voltage at both ends of the coil lead-out terminal 103 is measured by the voltmeter 105 and managed when the coil is energized, thereby managing the preheating temperature of the conductor coil.
[0073]
Table 1 shows the voltage V across the lead terminal at the time when the temperature of the thermocouple previously applied to the winding coil reached 60 ° C. with a direct current applied to the winding coil before forming the magnetic levitation railway ground coil. _The result of measuring _c is shown.
[0074]
[Table 1]

From the measurement results, the temperature management of the winding coil by energization can be controlled within a range of about ± 5% even considering the manufacturing error of the winding coil, which is sufficient as a preheating temperature management method during resin molding It was confirmed that it had accuracy.
[0075]
In addition, this invention is not limited to the said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.
[0076]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
[0077]
(A) According to the reaction injection molding according to the present invention, not only the mold but also the temperature of the insert inserted in the mold can be controlled, so that the reaction at the portion in contact with the insert proceeds well. The adhesion between the insert and the resin is improved. Further, since the temperature of the insert can be controlled to be constant even after the mold is closed, a reaction injection molded product having a constant quality can be obtained at all times.
[0078]
(B) Compared with the conventional heating equipment for a conductive coil, preheating can be performed easily and in a short time.
[0079]
(C) An appropriate preheating temperature can be ensured with high accuracy only by managing the voltage between both ends during energization.
[0080]
(D) Since electric heating is possible in a state where it is set in a molding die, it is easier to control the temperature at the time of resin injection and to stabilize the molding quality as compared with the conventional heating method.
[0081]
(E) Since there is no movement of the conductive coil from the preheating equipment to the molding equipment, the mass production efficiency is good and the molding cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an apparatus used for reaction injection molding according to an embodiment of the present invention.
FIG. 2 is a perspective view of the insert shown in FIG.
3 is a perspective example of the mold shown in FIG. 1. FIG.
FIG. 4 is a schematic configuration diagram of a conductive coil preheating apparatus according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 Insert 20a Protruding part 20b Insert main body 22 Mold 24 Cavity 25 Split surface 26 Mold main body 27 Notch 28 Elastic member 29 Groove 30 Variable voltage power supply 32 Ammeter 34 Wiring 36 Control means 101 Molding mold 102 Conductor coil 103 Coil lead terminal 104 External power supply (energization power supply)
105 Voltmeter 106 Cable for energization (cable for energization)

Claims (1)

The mold cavity, together with placing the ground coils for maglev inductive repulsion system capable energized externally energized from the outside of the mold to the maglev terrestrial coil of the induction repulsive type, the detecting a resistance change due to temperature change of the maglev terrestrial coil of the induction repulsive type, according to the resistance change, to change the power supplied to the maglev terrestrial coil of the induction repulsive type, the induction A reaction injection molding method, wherein reaction injection molding is performed in the mold while controlling the temperature of a repulsive magnetic levitation railway ground coil .

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