JPH09300385A - Method and mold device for manufacturing reaction injection molded article having insert body built-in - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To easily take out a molded product at the time of opening a mold, and moreover, an insert body embedded in the molded product can be stably arranged in a mold, and a reaction injection molding resin having a desired layer thickness. To provide a method and a mold device for producing a reaction injection-molded article having a built-in insert, capable of molding a layer. SOLUTION: Nesting dies 12a to 12e slidably movable in a take-out direction of a molded product are arranged inside a die, and a fitting pin hole 18 formed in the nesting die is used for fitting a support body 14 therein. The pin 16 is detachably mounted, the insert 8 is placed on the head of the support 14, and the insert 8 is placed inside the mold. The outer circumference of the insert 8 and the inner circumference of the mold are set. Gap between the surface 10
Then, the reaction stock solution is injected and reaction injection molding is performed. When the mold 22 is opened and the molded product 22 is taken out, the molded product 22 is taken out with the insert molds 12a to 12e attached to the outer periphery thereof.
Then, the insert molds 12a to 12e are removed from the outer periphery of the molded product 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a reaction injection-molded article having an insert body built therein and a mold apparatus used for the method.

[0002]

2. Description of the Related Art For example, in the case of a reaction injection molded article having a completely enclosed insert, the fixing of the insert in the mold is
It is performed using a support made of polyethylene or the like, the surface of which is melted and integrated by the heat of curing reaction during reaction injection molding.

When the support moves due to the injection pressure of the reaction solution, there are problems that the layer thickness of the reaction-molded resin layer is not constant, and that the insert is exposed at a portion where it should not be exposed.

[0004]

Therefore, as one of fixing methods for preventing the support from moving in the mold, a pin-shaped convex portion is provided on the support, and this is provided on the mold. The method of inserting and fixing in the hole for fixation is proposed.
After the molding of the molded product, the support becomes a part of the molded product, and the pin-shaped convex portions of the support are scraped after the molding.

This method is the most stable method for fixing the support, but has a problem that it is difficult to take out the molded product unless the projecting direction of the convex portion coincides with the taking-out direction of the molded product. The present invention has been made in view of such an actual situation, and a molded product can be easily taken out when the mold is opened, and moreover, an insert body embedded in the molded product can be stably arranged in the mold, and a desired layer thickness can be obtained. An object of the present invention is to provide a method of manufacturing a reaction injection-molded product having an insert body built therein and a mold apparatus capable of molding a reaction injection-molded resin layer.

[0006]

In order to achieve the above object, the first method for producing a reaction injection molded article according to the present invention comprises:
A step of disposing a nesting die that is slidable in the direction of taking out the molded product inside the die, and a first step formed on the nesting die.
A step of detachably mounting the second fitting part of the support on the fitting part, and a step of placing the insert on the head of the support and arranging the insert inside the mold. And a step of injecting a reaction stock solution into a gap between the outer periphery of the insert and the inner peripheral surface of the mold to perform reaction injection molding, and a step of molding the mold when opening the mold and taking out a molded product. There is a step of taking out the insert die with the insert die attached to the outer periphery of the product, and then a step of removing the insert die from the outer periphery of the molded product. In the present invention, after the support is detachably attached to the insert die, the insert die may be attached to the inner peripheral surface of the die.

A second method for producing a reaction injection molded product according to the present invention comprises a step of arranging an insert mold which is slidable in the direction of taking out the molded product inside the mold, and a step of forming the insert mold. And a step of disposing the second fitting portion projectingly formed on the insert body to the first fitting portion in a detachable manner, and disposing the insert body inside the mold, and the outer periphery of the insert body and the mold. The step of injecting the reaction stock solution into the gap between the inner peripheral surface of the mold and the reaction injection molding, and when the mold is opened and the molded product is taken out, the insert mold is attached to the outer periphery of the molded product. And the process of taking out in the state
Then, there is a step of removing the insert mold from the outer periphery of the molded product.

The mold apparatus according to the present invention is a mold apparatus in which a nesting mold that is slidably movable in the take-out direction of the molded product is mounted inside the mold. A first fitting portion detachably mounted in a direction different from the take-out direction is formed on a second fitting portion formed on the outer periphery or a support body that supports the molded product.

In the present invention, the first type formed in the nest type
The fitting portion is preferably a fitting recess, and in that case, the second fitting portion formed on the support or the insert is
It is preferable that the fitting projection is a fitting projection that is detachably fitted into the fitting recess. More preferably, the fitting protrusion is a pin-shaped protrusion. In the present invention, the first fitting portion may be the fitting convex portion and the second fitting portion may be the fitting concave portion.

As the reaction stock solution used in the reaction injection molding,
Although not particularly limited, urethane-based, urea-based, nylon-based, epoxy-based, unsaturated polyester-based, phenol-based, and norbornene-based, and the like, general molding conditions include a reaction solution temperature of 20 to 80 ° C. The viscosity of the reaction stock solution is, for example, 5 cps to 3 at 30 ° C.
000 cps, preferably 100 cps to 1000 cps
It is a degree.

In such molding, a reinforcing material may be installed in advance in a mold, and a reinforced polymer (molded product) may be manufactured by supplying a reaction solution into the reinforcing material and polymerizing it. As the reinforcing material, for example, glass fiber, aramid fiber, carbon fiber, ultra high molecular weight polyethylene fiber,
Examples thereof include metal fibers, polypropylene fibers, aluminum coated glass fibers, cotton, acrylic fibers, boron fibers, silicon carbide fibers, alumina fibers and the like. Also, whiskers such as potassium titanate and calcium sulfate can be used. Furthermore, these reinforcing materials can be used in various shapes, such as those obtained by matting a long fiber or chopped strand, those woven into a cloth, and those remaining in a chopped shape.
It is preferable that the surface of these reinforcing materials is treated with a coupling agent such as a silane coupling material in order to improve 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 based on the total amount of the reaction stock solution.

Further, various additives such as an antioxidant, a filler, a pigment, a colorant, a foaming agent, a flame retardant, a sliding agent, an elastomer, a dicyclopentadiene type thermopolymer resin and a hydrogenated product thereof are blended. Thereby, the properties of the obtained polymer can be modified. As the antioxidant, there are various antioxidants for plastics / rubbers such as phenol type, phosphorus type and amine type. Filled with milled glass,
There are inorganic fillers such as carbon black, talc, calcium carbonate, aluminum hydroxide and mica. As the elastomer, natural rubber, polybutadiene, polyisoprene, styrene-butadiene copolymer (SBR), styrene-butadiene-styrene block copolymer (SB
S), styrene-isoprene-styrene block copolymer (SIS), ethylene-propylene-diene terpolymer (EPDM), ethylene vinyl acetate copolymer (EV)
A) and their hydrides.

The additive is usually mixed in advance with one or both of the reaction solutions. In the present invention, the reaction injection molding resin layer is particularly preferably composed of a polynorbornene-based resin obtained by a reaction injection molding (RIM) method. In particular, those composed of a ring-opened polymer of a norbornene-based monomer modified with an elastomer are preferable.

Examples of the elastomer include polybutadiene, styrene-butadiene copolymer (SBR), styrene-butadiene-styrene block copolymer (SB).
S), polyisoprene, styrene-isoprene-styrene block copolymer (SIS), ethylene-propylene-diene terpolymer (EPDM) and the like.

The mixing ratio of the elastomer is 1 to 20 parts by weight, preferably 2 to 15 parts by weight, based on 100 parts by weight of the norbornene-based monomer. When the blending ratio of the elastomer is low, the flexibility decreases. Conversely, if the proportion of the elastomer is too large, the glass transition temperature decreases and the strength decreases, which is not preferable.

The norbornene-based monomer is a cycloolefin having a norbornene ring such as dicyclopentadiene, dihydrodicyclopentadiene, tetracyclododecene and tricyclopentadiene. The metathesis catalyst is not particularly limited as long as it is a known metathesis catalyst for bulk polymerization of norbornene-based monomers such as organic ammonium molybdates such as tungsten hexachloride, tridodecyl ammonium molybdate, and tri (tridecyl) ammonium molybdate. However, organic ammonium molybdate is particularly preferred.

Examples of activators (cocatalysts) include alkylaluminum halides such as ethylaluminum dichloride and diethylaluminum chloride, alkoxyalkylaluminum halides, and organic tin compounds.
As a preparation for reaction injection molding, a reaction injection molding material containing a norbornene-based monomer, a metathesis catalyst, and an activator as a main component is a liquid comprising a norbornene-based monomer and a metathesis catalyst, and the norbornene-based monomer and the activator are used. Separately into two stable liquids and separate liquids.

In the reaction injection molding, the two liquids are mixed, and then the mixed liquid is injected into the cavity of the mold in which the insert is fixed, and bulk polymerization is carried out in the cavity to form a poly in the insert. A molded product in which the norbornene-based resin layer is integrally formed is obtained. Since this reaction injection molding is performed by inserting the insert into the mold in advance, it is also insert molding.

In the present invention, the mold used for reaction injection molding does not necessarily have to be an expensive mold having high rigidity, and is not limited to a metal mold, but a resin mold or a simple mold is used. You can Also, the nesting type in the present invention,
It is not always necessary to use an expensive mold having high rigidity, and the invention 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 a low pressure by 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 under an atmosphere of an inert gas such as nitrogen gas.

The mold temperature for forming the norbornene-based resin layer is in a temperature range in which the polymerization reaction of the norbornene-based resin can be sufficiently maintained and the material (for example, polyolefin-based resin) forming the insert body is not thermally deformed. . It is preferably 10 ° C. or higher, more preferably 30 ° C. or higher, further preferably 50 ° C. or higher, and preferably 150 ° C. or lower, more preferably 120 ° C. or lower, still more preferably 100 ° C. or lower. If it is too low, the polymerization reaction of the norbornene-based monomer cannot be maintained, and if it is too high, the insert tends to be deformed. When the insert is made of polyethylene, for example, it is preferably 80 ° C or lower, more preferably 70 ° C or lower, and further preferably 6 ° C or lower.
Keep below 0 ° C. Mold pressure is usually 0.1-100kg
/ 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.

In the present invention, the material of the support is not particularly limited, but is composed of a polyolefin resin such as polyethylene or polypropylene. In the present invention, the material of the insert is not particularly limited, and may be metal or the like. However, the following effects can be expected by forming the insert with a polyolefin resin such as polyethylene or polypropylene. That is, by forming a polynorbornene-based resin layer in the insert made of a polyolefin-based resin rich in fusion bond with the polynorbornene-based resin,
The insert and the polynorbornene-based resin layer are firmly fixed to each other, and peeling can be prevented. When the support is also made of a polyolefin-based resin, the adhesion between the support and the polynorbornene-based resin layer is also enhanced.

In the present invention, the number of supports and the intervals of the supports are not particularly limited, and are determined so that the insert can be stably fixed in the mold. The size of each support is also not particularly limited, and is determined by the size of the insert, etc., so that the insert can be stably fixed in the mold.

In the method of manufacturing a molded article according to the first aspect of the present invention, the insert is placed on the head of the support arranged at appropriate intervals. Moreover, since the support body is fitted in the insert mold of the mold, it does not move even during the reaction injection molding. As a result, the insert can be stably placed in the mold, and by reaction injection molding, it is possible to form a reaction injection-molded resin layer having a desired uniform layer thickness on the outer periphery of the insert. Become.

In the method for manufacturing a molded article according to the second aspect of the present invention, the second fitting portions (preferably the convex portions) arranged at appropriate intervals on the outer periphery of the insert body are the insert molds of the mold. Since it is fitted in the first fitting portion (preferably a recess) of the above, the insert does not move even during reaction injection molding. As a result, the insert can be stably placed in the mold, and by reaction injection molding, it is possible to form a reaction injection-molded resin layer having a desired uniform layer thickness on the outer periphery of the insert. Become.

Further, in any of the methods for manufacturing a molded product according to any one of the aspects of the present invention, since the insert die is attached to the mold so as to be slidably movable in the direction in which the molded product is taken out, the molded product is opened. When taking out, a mold is attached to the outer periphery of the molded product. Then, the insert mold can be removed from the outer periphery of the molded product in the fitting direction. Therefore, the mold opening is easy.

In the present invention, the second member formed on the support
When the fitting portion or the second fitting portion formed directly on the insert is a fitting convex portion (for example, a pin shape), the fitting convex portion is taken out of the mold and removed from the nesting die. It appears protruding on the outer peripheral surface of the molded product. When the fitting convex portion is not necessary for the molded product as a finished product, it is removed by means such as scraping. If the finished product is acceptable, leave it as it is.

If the second fitting portion formed on the support body or the second fitting portion formed directly on the insert body is a fitting recess (for example, a pin hole shape), the fitting The recess appears as a recess on the outer peripheral surface of the molded product that is taken out of the mold and the nest mold is removed. If the fitting recess is not necessary for the finished molded product, it may be filled with some plug.
If the finished product is acceptable, leave it as it is. The recess may be a screw hole.

The overall shape of the reaction injection molded article of the present invention is not particularly limited, and various shapes such as a plate shape, a spherical shape, a prismatic shape, a cylindrical shape, and other three-dimensional shapes can be adopted.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for producing a reaction injection molded article and a mold apparatus according to the present invention will be described in detail based on the embodiments shown in the drawings. 1 is a cross-sectional view of a mold apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of the insert mold shown in FIG. 1, and FIG. 3 is a cross-sectional view showing a state in which a mold is opened after molding,
FIG. 4 is a cross-sectional view showing a state where the insert mold is removed from the molded product, and FIGS. 5 and 6 are main parts showing the positional relationship between the insert body, the support and the insert mold according to another embodiment of the present invention. FIG.

As shown in FIG. 1, a mold apparatus 2 according to one embodiment of the present invention has an upper mold 4 and a lower mold 6. In order to arrange the insert 8 with a predetermined gap in the space formed by combining the upper mold 4 and the lower mold 6, the support 14 is arranged at a predetermined distance on the inner peripheral surface of the lower mold 6. Will be placed in.

In this embodiment, in order to fix the support 14 at a predetermined position on the inner peripheral surface of the mold 6, the support 14 is fixed to the mold 6.
Nesting dies 12a-12e detachably mounted on the inner peripheral surface of the
Is fitted. Support 14 and nesting molds 12a to 12e
In order to removably fit the
The insert die 12a (similarly for 12b to 12e) is provided with a fitting pin hole 18 as a first fitting portion, and the support body 1
A fitting pin 16 is formed as a second fitting portion on the connector 4. The pin 16 can be detachably fitted into the pin hole 18.

As shown in FIG. 3, all the insert dies 12a to 12e are detachably attached to the lower die 6 in the die opening direction A of the die apparatus 2. Nesting dies 12a, 12b, 12 except for the nesting dies 12c arranged directly below
The attaching / detaching direction (fitting direction) between the d and 12e and the support 14 is
As shown in FIGS. 3 and 4, it is a direction different from the mold opening direction A. From the viewpoint of ease of mold opening, the fitting pin hole 18 may be directly formed on the inner peripheral surface of the lower mold 6 without providing the nesting mold 12c arranged directly below. However,
Rather than directly attaching only one support 12c to the inner peripheral surface of the lower mold 6, after attaching the support 14 to the insert molds 12a to 12e, the insert molds 12a to 12e are collectively attached to the lower mold 6. Workability is better when it is attached to.

In the embodiment shown in FIGS. 1 to 4, the insert molds 12a to 12e and the support body 14 are arranged only for the lower mold 6, but the upper mold 4 is provided on the inner peripheral surface of the mold. Also, the insert type and the support may be arranged in the same structure. next,
A method for manufacturing a molded product according to this embodiment will be described.

First, with the upper mold 4 and the lower mold 6 separated (mold open state), the insert mold 1 is placed at a predetermined position of the lower mold 6.
2a to 12e are set. Before and after that, each nesting type 12
The fitting pins 16 of the support 14 are fitted into the fitting pin holes 18 of a to 12e. The insert molds 12a to 12e can be made of the same material as that of the lower mold 6, for example, metal,
It is made of resin or ceramic.

In this embodiment, as shown in FIG. 2, the support 14 has a columnar shape in which the pin 16 is formed to project, but it may have a pillar shape or another shape. Pin 16
The shape of is not limited to a cylinder, but may be each pillar or another shape. The shape of the pin hole 18 is also determined according to the shape of the pin 16. The support 14 is made of, for example, a polyolefin resin such as polyethylene or polypropylene.

After arranging the insert molds 12a to 12e and the support 14 on the inner peripheral surface of the lower mold 6, the insert 8 is attached to the support 1.
It arranges so that it may be mounted on the head of No. 4. The material of the insert 8 is not particularly limited, and any material such as metal, resin, or ceramic may be used. The shape of the insert 8 is not particularly limited, and may be a sphere, an ellipse, a cylinder, each pillar, a polygon, or any other shape. The inside of the insert 8 may be hollow.
In the case where the insert 8 is a hollow body having a mouth, a liquid such as water may be put in from the mouth so that the insert 8 does not float up when the reaction stock solution is injected. Also,
From the viewpoint of preventing the insert body 8 from rising, a combination of the insert dies 12a to 12e and the support 14 may be arranged on the inner peripheral surface of the upper mold 4.

After setting the insert body 8 in the lower mold 6, FIG.
As shown in, the upper die 4 and the lower die 6 are combined on a split surface,
With the insert body 8 set inside, mold clamping is performed.
A cavity 10 is formed between the insert 8 and the inner peripheral surfaces of the molds 4 and 6. Next, the reaction stock solution is injected into the cavity 10 through an injection port (not shown).

In this embodiment, the reaction resin stock solution is prepared as follows. That is, dicyclopentadiene (D
CP) 85% and asymmetric cyclopentadiene trimer 15
% Of norbornene-based monomer, 5% of styrene-isoprene-styrene block copolymer (Kreighton 1170, Shell Co.) and phenolic antioxidant Irganox 1010 (Ciba Geigy Co.). Dissolve 2%, put this in two containers, and add diethylaluminum chloride (DEAC) to the monomer so that it has a concentration of 40 mmol, n-propanol has a concentration of 44 mmol, and silicon tetrachloride has a concentration of 20 mmol. Do (solution A). On the other hand, tri (tridecyl) ammonium molybdate is added to the monomer in an amount of 10%.
Add so that the concentration becomes millimolar (solution B).

Liquids A and B were respectively sent to a mixer by a gear pump so as to have a volume ratio of 1: 1 and then the mold was put into the cavity 10 in which the insert 8 was set from the injection port of the mold. Temperature 55 ° C and injection pressure (2.0) K
Inject at g / cm ² or less. The reaction is performed in the mold apparatus 2 for about 10 minutes.

After that, as shown in FIG. 3, the molds 4 and 6 are opened (mold opening). In this embodiment, the insert molds 12a to 12 are used.
Since e is attached to the mold 6 so as to be slidable in the take-out direction A of the molded product, the mold 22 is opened when the mold is opened and the molded product 22 on which the reaction injection molding resin layer 20 is formed is taken out. Nesting molds 12a to 12e are attached to the outer periphery of the. Then, as shown in FIG.
2a to 12e can be removed from the outer periphery of the molded product 22. Therefore, the mold opening is easy.

Thereafter, the pin 16 formed on the outer periphery of the molded product 22 shown in FIG. 4 is removed by means such as cutting or cutting as required. When the molded product 22 is used for a purpose in which the pin 16 may remain on the outer periphery of the molded product 22, it is left as it is. In the present embodiment, as shown in FIG. 1, the insert 8 is placed on the head of the support 14 arranged at appropriate intervals. Moreover, since the support 14 is fitted in the mold insert molds 12a to 12e, it does not move even during reaction injection molding. As a result, the insert 8 can be stably arranged in the mold apparatus 2, and the reaction injection molding resin layer 20 having a desired uniform layer thickness is formed on the outer periphery of the insert 8 by the reaction injection molding. It becomes possible to do.

Note that the present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention. For example, as shown in FIG.
In the mold device 2a including the lower mold 6a and the lower mold 6a, when the insert 8a has a ring shape, only the outer periphery of the insert 8a can be supported by the support 14a.
In this case, the insert die 12f is slidably mounted on the lower die 6a in the mold opening direction, and the fitting pin 16a formed on the support 14a is attached to the insert die hole 12f of the insert die 12f.
8a is fitted.

Further, as shown in FIG. 6, in the mold device 2b composed of the upper mold 4b and the lower mold 6b, the insert 8b is inserted.
Is a ring shape and the outer periphery of the molded product is a concave curved surface, it is not necessary for the entire length of the fitting pin 16b of the support 14b to enter into the fitting pin hole 18b of the insert die 12g. .

Further, in the above-mentioned embodiment, the insert 8 is stably attached to the inside of the mold device 2 by using the support 14, but the support 14 having the pin 16 is integrally formed on the outer periphery of the insert 8. The pin 16 formed on the insert 8 by molding
You may directly attach to the pin hole 18 of this. Even in that case,
The same operational effects as those of the above-described embodiment are achieved.

Further, in each of the above-described embodiments, the pins are formed as the fitting protrusions on the support and the pin holes are formed as the fitting recesses in the insert mold, but the reverse is also possible. Furthermore, the fitting protrusion is not limited to the pin shape, and may have other protrusion shapes. In that case, the shape of the fitting recess is made to match the shape of the protrusion.

[0046]

As described above, the first aspect of the present invention is as follows.
In the method for manufacturing a molded article according to the above aspect, the insert is placed on the head of the support arranged at appropriate intervals. Moreover, since the support body is fitted in the insert mold of the mold, it does not move even during the reaction injection molding. As a result, the insert can be stably placed in the mold, and by reaction injection molding, it is possible to form a reaction injection-molded resin layer having a desired uniform layer thickness on the outer periphery of the insert. Become.

In the method for manufacturing a molded article according to the second aspect of the present invention, the second fitting portions (preferably the convex portions) arranged at appropriate intervals on the outer periphery of the insert are the insert molds of the mold. Since it is fitted in the first fitting portion (preferably a recess) of the above, the insert does not move even during reaction injection molding. As a result, the insert can be stably placed in the mold, and by reaction injection molding, it is possible to form a reaction injection-molded resin layer having a desired uniform layer thickness on the outer periphery of the insert. Become.

Further, in any of the methods for manufacturing a molded product according to any one of the aspects of the present invention, since the insert die is attached to the mold so as to be slidable in the direction in which the molded product is taken out, the molded product is opened. When taking out, a mold is attached to the outer periphery of the molded product. Then, the insert mold can be removed from the outer periphery of the molded product in the fitting direction. Therefore, the mold opening is easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a mold device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the insert type shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which a mold is opened after molding.

FIG. 4 is a cross-sectional view showing a state where the insert mold is removed from the molded product.

FIG. 5 is a cross-sectional view of essential parts showing a positional relationship among an insert body, a support body, and a nesting die according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view of essential parts showing a positional relationship among an insert body, a support body, and a nesting die according to still another embodiment of the present invention.

[Explanation of symbols]

 2, 2a, 2b ... Mold device 4,4a, 4b ... Upper mold 6,6a, 6b ... Lower mold 8,8a, 8b ... Insert 10 ... Cavities 12a-12g ... Nesting mold 14, 14a, 14b ... Supports 16, 16a, 16b ... Fitting pins 18, 18a, 18b ... Fitting pin holes 20 ... Reaction injection molding resin layer 22 ... Molded product

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29C 45/44 B29C 45/44 // B29K 101: 00 705: 00

Claims (3)

[Claims] 1. A step of arranging a nesting die that is slidable in a take-out direction of a molded product inside a die, and a second fitting of a support to a first fitting portion formed in the nesting die. A step of removably attaching the joint part; a step of placing the insert body on the head of the support body and disposing the insert body inside the mold; an outer periphery of the insert body and a mold The nest mold is attached to the outer periphery of the molded product when the reaction stock solution is injected into the gap between the inner peripheral surface and the reaction injection molding is performed, and when the mold is opened and the molded product is taken out. A method for producing a reaction injection molded product having an insert body, which comprises a step of removing the insert mold from the outer periphery of the molded product and a step of thereafter removing the insert mold from the outer periphery of the molded product. 2. A step of disposing a nesting die that is slidably movable in a take-out direction of a molded product inside a die, and a first fitting portion formed in the nesting die so as to protrude from an insert body. The step of mounting the inserted second fitting portion in a detachable manner and disposing the insert body inside the mold; and the reaction stock solution in the gap between the outer circumference of the insert body and the inner peripheral surface of the mold. The step of injecting and performing the reaction injection molding, the step of taking out the molded product with the insert mold attached to the outer periphery of the molded product when opening the mold and taking out the molded product, and then the outer periphery of the molded product And a step of removing the insert die from the step of manufacturing a reaction injection molded article having a built-in insert. 3. A mold device in which an insert die slidably movable in the take-out direction of the molded article is mounted inside the die, and the insert die supports the outer periphery of the molded article or the molded article. A mold apparatus in which a second fitting portion formed on the support has a first fitting portion detachably mounted in a direction different from the take-out direction.