JP6042738B2 - Mold device for in-mold foam molding - Google Patents

Description

  The present invention relates to a mold apparatus for in-mold foam molding in which foamed resin particles are heated and foam-fused in a molding space to obtain a molded product.

  As molding technology for foamed molded products, foamable resin particles made of thermoplastic synthetic resin materials such as polystyrene, polypropylene and polyethylene are filled into the molding space, and this is heated, foamed and fused with steam, etc., and then cooled. An in-mold foam molding apparatus configured to obtain a foam molded article having a desired shape is widely known.

  A mold apparatus for the in-mold foam molding apparatus includes a concave unit having a concave mold and a concave housing that holds the concave mold, and a convex unit having a convex mold and a convex housing that holds the convex mold. Widely adopted. The concave housing includes a rectangular cylindrical concave frame provided so as to surround the concave mold, a concave fixing plate that closes the opening on the back side of the concave frame, and a front end of the concave mold, and a concave mold and a concave mold. A concave center plate that closes an opening formed between the frames and a concave chamber for supplying steam and cooling water is formed in the concave housing on the back side of the concave. In addition, the convex housing includes a rectangular cylindrical convex frame provided so as to surround the convex mold, a convex fixing plate that closes the opening on the back side of the convex frame, and an end on the convex rear side. And a convex center plate that closes the opening formed between the convex mold and the convex frame, and supplies steam and cooling water into the convex housing on the rear side of the convex mold. Those having a convex chamber are widely used.

  The convex fixing plate or the concave fixing plate is provided with a filling device for filling the foamable resin particles. The convex housing and the concave housing are for supplying steam to the convex chamber and the concave chamber. Steam pipes and cooling water pipes for supplying cooling water are connected to each other, and drain pipes are connected to the lower portions of both housings.

  When molding the molded product, the foamable resin particles filled in the molding space are heated by the steam supplied to the convex chamber or the concave chamber, and the cooling water sprayed on the back side of the convex chamber or the concave chamber is used. The molded product will be cooled, but the heating and cooling at the time of molding is not only foamable resin particles, but also a molding die and housing, filler and ejector pins, steam piping and cooling water that do not require heating or cooling. Since piping is also performed, there is a problem that a lot of energy is wasted.

In view of this, various types of metal mold apparatuses that save energy by locally heating only the mold and reducing the amount of steam used instead of heating the entire mold have been proposed and put to practical use. .
For example, a foam molding apparatus (see, for example, Patent Document 1) including an independent steam chamber for each mold or a plurality of molds out of a plurality of molding molds, a core mold, There has also been proposed a foam molding apparatus (see, for example, Patent Document 2) in which an exterior member that surrounds the back side opposite to the cavity mold forming space is provided, and an independent steam chamber is formed for each core mold and cavity mold. .

  However, in the invention described in Patent Document 1, it is necessary to provide a partition plate for partitioning the steam chamber on the back side of the convex mold. In the invention described in Patent Document 2, the side opposite to the molding space of the core mold and the cavity mold is required. It is necessary to provide an exterior member that surrounds the back side of the mold, and it is difficult to apply to an existing mold apparatus. In addition, in these inventions, since the number of parts constituting the mold apparatus is increased, the manufacturing cost of the mold apparatus is increased, the heat capacity of the mold apparatus is increased, and the energy consumption required for heating and cooling is increased. There was a problem of increasing by a minute.

  Therefore, in Patent Document 3, the concave mold is supported in a cantilever shape using a concave fixing member, and a front opening that opens toward the convex unit side is formed between the concave mold and the concave housing. In a state where the concave and convex shapes are combined, the front opening is closed with a convex unit to make the concave chamber airtight, so that the center plate of the concave unit can be omitted, A mold apparatus with a reduced heat capacity has been proposed.

  However, in the apparatus of Patent Document 3, since the concave mold and the concave mold fixing member are fixed, they cannot move at all with respect to deformation force (for example, linear expansion due to heat at the time of molding heating), and stress can be released. There is room for improvement in that stress is concentrated and it is easy to break.

On the other hand, as a method of further reducing the heat capacity of the mold apparatus, a method of reducing the thickness of the concave mold and the convex mold itself can be considered. However, from the viewpoint of durability, the current situation is that the thickness cannot be reduced, and the reason for the lack of durability is that when the concave mold and the convex mold are pressed by the linear expansion of the mold during heating, high stress is generated. Conceivable.
A technique for reducing the stress generated by linear expansion has not been developed yet.

  In Patent Document 4, in a mold apparatus having a cavity mold that opens and closes in the vertical direction, a convex mold that is a core mold is installed on a vapor chamber wall (convex housing) using an elastic fixing member, and a center is formed in the convex unit. A mold apparatus is disclosed in which the plate is omitted.

  However, since the elastic fixing member is not protected and is installed as it is, when a force other than the mold opening / closing direction is applied, there is a disadvantage that the elastic fixing member is unnecessarily deformed. For this reason, the mold apparatus of Patent Document 4 has a problem that it can be applied only to a molding machine (vertical molding machine) that matches the mold opening / closing direction and the gravity direction as described in Patent Document 4.

Japanese Utility Model Publication No.59-7072 JP 11-48349 A JP 2010-120336 A Japanese Patent Laid-Open No. 2-292020

  The object of the present invention is to provide a mold apparatus in which the center plate in the concave unit in Patent Document 3 is omitted, by releasing the force that the concave mold and the convex mold are pressed by linear expansion generated by heating. It is an object of the present invention to provide a mold apparatus for in-mold foam molding that can be made thinner and further reduce the heat capacity of the mold apparatus to realize significant energy saving.

  In the mold apparatus in which the center plate in the concave unit in Patent Document 3 is omitted, the inventor incorporates an elastic body into a concave fixing member that supports the concave mold in a cantilevered manner, thereby generating a wire generated by heating. The force that the concave and convex molds press against each other due to expansion can be released by the contraction of the elastic body, making it possible to prevent high stress from being generated on the concave and convex molds, and reducing the thickness of the concave and convex molds. As a result, the present inventors have found that the heat capacity of the mold apparatus can be reduced and significant energy saving can be realized.

  The elastic body is preferably a metal spring from the viewpoint of durability against corrosion of the elastic body itself. The material of the metal spring is more preferably SUS steel from the viewpoint of durability against corrosion.

That is, this invention consists of the following structures.
[1] A concave unit having a concave mold and a concave housing holding the concave mold, a concave unit having a concave chamber formed in the concave housing on the back side of the concave mold, a convex mold and a convex housing holding the convex mold. A convex unit having a convex chamber formed in a convex housing on the back side of the mold,
The concave mold is supported in a cantilever manner on a concave housing to form a front opening that opens toward the convex unit between the concave mold and the concave housing, and the concave mold and the convex mold are combined. A foaming resin particle is filled in a molding space formed by a concave mold and a convex mold in which the front opening is closed with a convex unit to make the concave chamber airtight, and foamability is formed in the molding space. A mold apparatus for in-mold foam molding in which resin particles are heated and foam-fused to obtain a molded product,
The concave housing has a concave frame provided so as to surround the concave mold, a concave fixing plate that closes the opening on the back side of the concave frame, and a concave fixing member that fixes the concave mold to the concave fixing plate in a cantilevered manner. A front opening that opens toward the convex unit side between the concave mold and the concave frame is formed;
A mold apparatus for in-mold foam molding, wherein an elastic body that expands and contracts in a mold opening / closing direction is incorporated in a part of a concave mold fixing member.
[2] The mold apparatus for in-mold foam molding according to [1], comprising a metal member that protects the elastic body so that the elastic body is not deformed except in the mold opening / closing direction.
[3] The mold apparatus for in-mold foam molding according to [1] or [2], wherein the elastic body is a metal spring.
[4] The mold apparatus for in-mold foam molding according to [3], wherein a material of the metal spring is SUS steel.

  According to the mold apparatus for in-mold foam molding according to the present invention, in the mold apparatus in which the center plate in the concave unit in Patent Document 3 is omitted, the concave mold is elastically supported by the concave mold fixing member that cantileverly supports the concave mold housing. By incorporating the body, it is possible to release the force that the concave and convex molds press against each other due to the linear expansion caused by heating, and the elastic body contracts, and it is possible to prevent the concave and convex molds from generating high stress. As a result, it is possible to reduce the heat capacity of the mold apparatus and realize significant energy saving.

The longitudinal cross-sectional view in the mold open state of the mold apparatus for in-mold foam molding of the 1st form in patent document 3 (Unexamined-Japanese-Patent No. 2010-120336). The longitudinal cross-sectional view in the mold closed state of the mold apparatus for in-mold foam molding of the 1st form in patent document 3 (Unexamined-Japanese-Patent No. 2010-120336). The longitudinal cross-sectional view in the mold open state of the mold apparatus for in-mold foam molding of the 2nd form of patent document 3 (Unexamined-Japanese-Patent No. 2010-120336). The longitudinal cross-sectional view in the mold open state of the mold apparatus for in-mold foam molding of the 3rd form of patent document 3 (Unexamined-Japanese-Patent No. 2010-120336). Sectional drawing of an example of the method of incorporating an elastic body in the concave fixing member 15. FIG. FIG. 5 is a sectional view of the elastic body in a contracted state

  Embodiments of the present invention will be described below with reference to the drawings.

  The mold apparatus for in-mold foam molding according to the present invention is a mold apparatus in which the center plate of the recessed unit in Patent Document 3 (Japanese Patent Laid-Open No. 2010-120336) is omitted, and the recessed mold is supported in a cantilever manner on the recessed housing. Therefore, an elastic body that expands and contracts in the mold opening / closing direction is incorporated into a part of the concave fixing member used for this purpose.

  First, a mold apparatus in which the center plate of the concave unit shown in Patent Document 3 (Japanese Patent Application Laid-Open No. 2010-120336) is omitted will be described.

  As shown in FIG. 1 and FIG. 2, a mold apparatus 1 for in-mold foam molding of a first form of Patent Document 3 (Japanese Patent Application Laid-Open No. 2010-120336) includes a concave mold 11 and a concave housing 12 that holds the concave mold 11. A molding space 2 that includes a unit 10, a convex unit 20 having a convex mold 21 and a convex housing 22 that holds the unit 21, and is formed by the concave mold 11 and the convex mold 21 by combining the units 10 and 20. The foamable resin particles are filled therein, and the foamable resin particles are heated and foam-fused in the molding space 2 to obtain a molded product.

  The concave mold 11 and the convex mold 21 are made of a material having a low specific heat and high thermal conductivity, for example, a casting made of an aluminum alloy so that the molded product can be smoothly heated and cooled. The wall thickness is often about 15 mm. Both housings 12 and 22 are made of an iron-based metal in order to reduce the manufacturing cost of the mold apparatus 1 and to ensure sufficient strength and rigidity.

  The concave housing 12 includes a rectangular tube-shaped concave frame 13 provided so as to surround the concave mold 11, a concave fixing plate 14 that closes an opening on the back side of the concave frame 13, and the concave mold 11 on the concave fixing plate 14 in a cantilever shape. A concave chamber 16 is formed in the concave housing 12 on the back side of the concave mold 11. The concave mold 11 is fixed and supported in a cantilever manner on the concave mold fixing plate 14 via the fixing member 15 with the opening side facing the front side (the mating surface side of the concave mold 11 and the convex mold 21). The part 11a is configured with a free end. That is, in the conventional mold apparatus 1, the front side end portion 11 a of the concave mold 11 is fixed to the concave frame 13 via the center plate 30 as indicated by a virtual line in FIG. In the mold apparatus 1 of the first form (open 2010-120336), the center plate 30 is omitted, and the front side end portion 11a of the concave mold 11 is configured as a free end.

  The convex housing 22 includes a rectangular cylindrical convex frame 23 provided so as to surround the convex mold 21, a convex fixing plate 24 that closes an opening on the back side of the convex frame 23, and a convex fixing plate 24. It has a rod-shaped fixing member 25 that fixes and supports the convex mold 21, and a center plate 27 that fixes the rear side end of the convex mold 21 to the convex frame 23. The center plate corresponds to the opening of the convex mold 21. An opening 27 b is formed in 27, and a convex chamber 26 is formed in the convex housing 22 on the back side of the convex mold 21 and the center plate 27.

  In a state where the concave mold 11 and the convex mold 21 are combined, the front opening 17 of the concave unit 10 is closed in a substantially airtight manner by the center plate 27 of the convex unit 20. A steam supply pipe 28a, a cooling water supply pipe 28b, and a drain pipe 28c that open into the convex chamber 26 are connected to the convex unit 20, and control valves 29a to 29a interposed in the middle of these pipes 28a to 28c. By operating 29c, steam is supplied into the convex chamber 26 to heat and foam the foamable resin particles, or cooling water is sprayed from the nozzle 28d to the back side of the convex mold 21 to cool the molded product, An unnecessary drain can be discharged from the convex chamber 26. A large number of vent holes 21b are formed in the convex mold 21, and steam is supplied from the convex chamber 26 into the molding space 2 through the vent holes 21b. However, it is possible to supply steam to the molding space 2 from other than the concave chamber 16 and the convex chamber 26. For example, the steam is supplied into the molding space 2 from the joint of the concave mold 11 and the convex mold 21, or a filling device. It is also possible to form a vent hole around the periphery of the ejector pin 3 and the ejector pin and supply steam into the molding space 2 from the vent hole.

  In the center plate 27, in a state where the concave mold 11 and the convex mold 21 are combined, a restricting portion 27a disposed outside the front side end portion 11a of the concave mold 11 is formed in a protruding shape, and this restricting portion 27a is used for molding. With the foaming pressure at, the front end 11a of the concave mold 11 is prevented from bulging outward. The restricting portion 27a can be formed in an annular shape corresponding to the entire circumference of the front side end portion 11a of the concave mold 11 or intermittently if the front side end portion 11a of the concave mold 11 can be prevented from bulging. It is also possible to provide it. Further, although the restricting portion 27 a is formed on the center plate 27, the restricting portion 27 a can be provided on the concave mold 11.

  When molding a molded product using the mold apparatus 1 for in-mold foam molding, the concave mold 11 and the convex mold 21 are closed to form the molding space 2 as in the conventional molding method, and this molding is performed. The space 2 is filled with foamable resin particles by being placed on the air flow from the filler 3. As a filling method of the expandable resin particles, a known filling method such as compression filling, pressure filling, cracking filling, or the like can be adopted.

  Then, steam is supplied from the concave chamber 16 to the convex chamber 26 through the molding space 2, steam is supplied from the convex chamber 26 through the molding space 2 to the concave chamber 16, At the same time, steam is supplied or the foamable resin particles are heated and foamed and fused in the molding space 2 to form a molded product, and then cooling water is sprayed to the back side of the concave mold 11 and convex mold 21. In addition, the molded product is cooled together with the concave mold 11 and the convex mold 21, and after cooling the molded product, the concave mold 11 and the convex mold 21 are opened to obtain a molded product.

  Next, a mold apparatus 1A according to a second embodiment, in which the configuration of the mold apparatus 1 is partially changed, will be described. In addition, the same code | symbol is attached | subjected to the same member as the said 1st form, and the detailed description is abbreviate | omitted.

As shown in FIG. 3, the concave unit 10 of the mold apparatus 1A is configured similarly to the concave unit 10 of the first form, and the convex housing 22A of the convex unit 20A is the center plate in the first embodiment. Instead of 27, a cover plate 27A for closing the opening on the back side of the convex mold 21 is provided for each convex mold 21, and the convex mold 26 and the cover plate 27A form a convex chamber 26A. The lid plate 27A and the convex mold 21 are fixedly supported by the convex fixed plate 24 in a cantilever manner, and the steam supply pipe 28a, the cooling water supply pipe 28b, and the drain pipe 28c are individually connected to each convex chamber 26A. Is.
In the mold apparatus 1A, the center plate 30 of the concave unit 10 can be omitted as in the mold apparatus 1 of the first embodiment.

  Next, a mold apparatus 1B according to a third embodiment in which the configuration of the mold apparatus 1 is partially changed will be described. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 4, the concave unit 10 of the mold apparatus 1B is configured similarly to the concave unit 10 of the first embodiment, and the convex housing 22B of the convex unit 20B is the convex unit in the first embodiment. The center plate 27 of 20 and the fixing member 25 are omitted, the convex mold 21 is directly fixed to the convex fixing plate 24, and the opening on the back side of the convex mold 21 is closed with the convex fixing plate 24, A convex chamber 26B is formed for each convex mold 21 by the convex mold 21 and the convex fixing plate 24, and a steam supply pipe 28a, a cooling water supply pipe 28b and a drain pipe 28c are individually connected to each convex chamber 26B. Is.
In the mold apparatus 1B, the center plates 30 and 27 of the concave unit 10 and the convex unit 20B can be omitted, and the fixing member 25 can also be omitted for the convex unit 20B.

  In the mold apparatus for in-mold foam molding of the present invention, the elastic body 50 is incorporated in the concave mold fixing member 15 that supports the concave mold 11 in a cantilever manner with respect to the concave mold fixing plate 14, so that the mold is opened and closed by heating. The force with which the concave mold and the convex mold are pressed by the generated linear expansion can be released (absorbed) by contraction of the elastic body, and the effects of the present invention can be exhibited.

The allowable displacement amount of the elastic body 50 (the maximum value at which the elastic body can be displaced) is such that the distance in the mold opening / closing direction between the concave fixing plate 14 and the convex fixing plate 24 in the mold closed state is the concave mold 11 and the convex mold 21. It is necessary to be larger than the deformation amount narrowed by the linear expansion of the metal constituting the fixing member 15.
If the allowable displacement amount of the elastic body 50 is smaller than the deformation amount of the distance due to the metal linear expansion, the pressing force between the concave mold and the convex mold may not be released (absorbed).

The elastic body 50 is preferably installed in a state compressed from its original length, that is, in a state where an elongation stress of 0.5 MPa or more is generated, from the viewpoint of dimensional stability in the mold opening / closing direction of the foamed molded body.
If the elongation stress of the elastic body is less than 0.5 MPa, the elastic body may be deformed by the foaming force of the foam molded body, so a gap is formed between the concave mold and the convex mold, and the foam molded body There is a possibility that the dimension in the mold opening and closing direction becomes larger than a predetermined size.

  The elongation stress at the maximum displacement of the elastic body 50 is preferably equal to or lower than the clamping pressure of the molding machine to be used. If the elongation stress at the maximum displacement of the elastic body is larger than the clamping pressure of the molding machine, when a large stress is generated by linear expansion during heating, the stress is not in the direction in which the elastic body deforms, In order to escape in the direction to open the mold, the mold apparatus opens, and there is a risk that steam during heating leaks from the mating surface of the mold apparatus to the outside. growing.

  The material of the elastic body 50 incorporated in the fixing member 15 is not particularly limited as long as it is a general elastic body that is immediately deformed in response to stress, and examples thereof include a metal spring, rubber, a disc spring, and a foam. Among these, a metal spring is preferable because it has a wide selection range of elastic modulus and size and is excellent in heat resistance. Further, from the viewpoint of corrosion resistance, the material of the metal spring is more preferably SUS steel.

In an embodiment in which the elastic body 50 is incorporated into the concave fixing member 15, it is preferable to protect the elastic body 50 with a metal as shown in FIG.
In a general mold apparatus, the mold opening / closing direction and the gravitational direction often do not coincide with each other. Therefore, it is necessary to support the weight of the concave mold 11 by the concave fixing member 15. However, since the elastic body 50 often cannot support stresses other than the displacement direction (opening / closing direction of the mold), by using a combination of two types of elastic body protection metals, due to the rigidity of these elastic body protection metals, It is preferable to support the weight of the concave mold 11.

  Specifically, as shown in FIG. 5, the concave fixing member 15 includes a concave side elastic body protection metal 51, a concave fixing plate side elastic body protection metal 52, an elastic body 50, and an elastic body stroke adjustment bolt.

The concave side elastic body protection metal 51 and the concave fixed plate side elastic body protection metal 52 each have a leg portion, and are arranged so that the leg portions face each other. The concave elastic body protection metal 51 and the concave fixing plate elastic body metal 52 are arranged in such a manner that the legs can contact and slide so that the elastic body 50 can be displaced (stroked) in the mold opening and closing direction. It is preferable.
At this time, the leg portion of the concave elastic body protection metal 51 and the leg portion of the concave fixing plate side elastic body protection metal 52 are not brought into contact with each other, but are supported by the smallest possible contact surface as shown in FIG. Is preferable in terms of preventing wear due to friction between metals.

The elastic body 50 is disposed inside the concave side elastic body protection metal 51. The elastic body 50 has an end in the mold opening / closing direction of the elastic body 50 in the concave side elastic body protection metal 51 and the concave side fixing body side elastic body protection with respect to the concave side elastic body protection metal 51 and the concave side fixing plate side elastic body protection metal 52. The metal 52 is in contact.
In the concave fixing member 15 according to the present invention, as shown in FIG. 5, an elastic body stroke adjusting bolt 53 is installed inside the elastic body 50, so that the extension stress when the elastic body is attached and the extension stress when the elastic body is maximum displaced. By adjusting this, it is possible to easily adjust the amount of displacement of the elastic body 50, which is preferable.

The elastic body stroke adjusting bolt 53 includes a head portion and a screw portion, but is arranged so that the head portion is on the concave fixed plate side elastic body protective metal 52 side, and the screw portion is a concave fixed plate side elastic body. In a state of passing through the through hole provided in the protective metal 52, it is inserted and fastened into the screw hole provided in the concave elastic body protective metal 51.
At this time, the upper end of the head of the elastic body stroke adjusting bolt 53 is not in contact with the concave fixing plate 14 on the surface opposite to the side where the leg portion is provided on the concave fixing plate side elastic body protection metal 52. A protective part for forming a gap is provided. The concave fixing plate 14 is also provided with a concave portion corresponding to the protection portion.

In the concave fixing member 15 according to the present invention, it is preferable that the concave fixing plate 14 and the concave fixing plate side elastic body protection metal 52 are firmly fixed using bolts 56 in order to support their own weight.
In addition, as shown in FIG. 5, it is possible to install the concave raised material 54 so that there is a gap between the concave mold 11 and the concave elastic body protecting metal 51, so that the elastic body stroke adjustment bolt 53 contacts the concave mold 11. This is preferable because it is not allowed to occur.
At this time, it is preferable that the concave-side elastic body protection metal 51 and the concave-type raising material 54 are firmly fixed using bolts 55 in order to support their own weight.

  The mechanism by which the elastic body absorbs the force with which the concave mold and the convex mold press due to the linear expansion of the mold due to heating will be described with reference to FIGS.

FIG. 5 shows the concave fixing member 15 before heating.
The concave-side elastic protective metal 51 and the concave-type fixing plate-side elastic protective metal 52 are connected to the distal end of the leg of the concave-type fixing plate-side elastic protective metal 51 and the side of the concave-type fixing plate at the base of the concave-type elastic protective metal 51 via the elastic body 50. (Referred to as “region A”) with a certain gap.
On the other hand, the lower end of the head of the elastic body stroke adjustment bolt 53 is disposed in contact with the side of the concave fixed plate at the base of the concave fixed plate side elastic protective metal 521 (note that the head of the elastic body stroke adjustment bolt 53 is ) And the concave fixed plate side surface of the base of the concave fixed plate side elastic protective metal 52 are referred to as “region B”).

  When a force is generated by pressing the concave mold and the convex mold due to linear expansion of the mold due to heating, the elastic body 50 contracts as shown in FIG. On the other hand, in the region B, the lower end of the head of the elastic body stroke adjustment bolt 53 is separated from the elastic body protection metal 52, and only the elastic body 50 is displaced, and the concave side elasticity that is the metal portion is It can be seen that the protective metal 51, the concave fixed plate side elastic protective metal 52, and the elastic body stroke adjusting bolt 53 do not have a force to be displaced and move as a whole without difficulty.

  By applying the present invention, since no strong stress is generated in the concave mold 11 and the convex mold 21, it is not necessary to consider the durability of the concave mold 11 and the convex mold 21, and the thickness can be reduced.

However, in general, the concave mold 11 and the convex mold 21 are provided with an infinite number of cylindrical vapor vents called core vents, and a thickness of about 8 mm is required for installing the core vents.
Therefore, as in the present invention, in the in-mold foam shaping mold using the concave fixing member incorporating the elastic body, the thickness of the concave mold 11 and the convex mold 21 can be reduced from about 15 mm to about 8 mm. Therefore, it is clear that the heat capacity can be reduced to about half and energy saving can be realized.

DESCRIPTION OF SYMBOLS 1 Mold apparatus 2 for foam molding 3 Molding space 3 Filler 10 Recessed unit 11 Recessed mold 11a Front end 11b Vent hole 12 Recessed housing 13 Recessed frame 13a Front end 14 Recessed fixing plate 15 Recessed fixing member 16 Recessed chamber 17 Front opening 18a Steam supply pipe 18b Cooling water supply pipe 18c Drain pipe 18d Nozzle 19a to 19c Control valve 20 Convex unit 21 Convex 21b Vent hole 22 Convex housing 23 Convex frame 24 Convex fixed plate 25 Convex fixed plate Member 26 Convex chamber 27 Center plate 27a Restriction part 27b Opening part 28a Steam supply pipe 28b Cooling water supply pipe 28c Drain pipe 28d Nozzle 29a-29c Control valve 30 Center plate 1A Mold apparatus 20A Convex unit 22A Convex housing 26A Convex Mold chamber 27A Cover plate 1B Mold device 20B Convex unit 22B Convex housing 24a Restricting part 26B Convex chamber 50 Elastic body 51 Concave side elastic body protection metal 52 Concave plate fixing side elastic body protection metal 53 Elastic body stroke adjustment bolt 54 Concave type raising material 55 Concave side Bolt 56 for connecting the elastic body protection metal 51 and the concave raised material 54 Bolt for connecting the concave body fixing plate 14 and the concave body fixing plate side elastic body protection metal 52

Claims (4)

A concave unit having a concave mold and a concave housing that holds the concave mold unit, a concave unit having a concave chamber formed in the concave housing on the concave rear surface side, and a convex mold and a convex housing that holds the convex mold; A convex unit with a convex chamber formed in the convex housing on the side,
The concave mold is supported in a cantilever manner on a concave housing to form a front opening that opens toward the convex unit between the concave mold and the concave housing, and the concave mold and the convex mold are combined. A foaming resin particle is filled in a molding space formed by a concave mold and a convex mold in which the front opening is closed with a convex unit to make the concave chamber airtight, and foamability is formed in the molding space. A mold apparatus for in-mold foam molding in which resin particles are heated and foam-fused to obtain a molded product,
The concave housing has a concave frame provided so as to surround the concave mold, a concave fixing plate that closes the opening on the back side of the concave frame, and a concave fixing member that fixes the concave mold to the concave fixing plate in a cantilevered manner. A front opening that opens toward the convex unit side between the concave mold and the concave frame is formed;
A mold apparatus for in-mold foam molding, wherein an elastic body that expands and contracts in a mold opening / closing direction is incorporated in a part of a concave mold fixing member.   The mold apparatus for in-mold foam molding according to claim 1, further comprising a metal member for protecting the elastic body so that the elastic body is not deformed except in the mold opening / closing direction.   The mold apparatus for in-mold foam molding according to claim 1, wherein the elastic body is a metal spring.   The mold apparatus for in-mold foam molding according to claim 3, wherein a material of the metal spring is SUS steel.

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