JP2002264150A - Core mold unit for in-mold foam molding and mold for in-mold foam molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core mold unit for in-mold foam molding by which exchanging work for a core mold can be simply performed, and to provide a mold for in-mold foam molding. SOLUTION: In a mold 1 for in-mold foam molding provided with a mold frame 3, a back plate 5, an core plate 7, and a steam room 8 therein, is provided the mold 1 for in-mold foam molding in which this core mold unit 9 for in-mold foam molding is inserted into the steam room 8 through a fitting hole 6 from the outside space 11 in such a way that the other face side 10b of the back plate 10 for the core mold unit 9 for in-mold foam molding is brought into intimate contact with the surroundings of the steam room 8 side of a through- hole 4, and a flange 13 projected on the end edge of the intermediate mold 12 of this core mold unit 9 for in-mold foam molding is freely removably fitted on the surroundings of the outside space 11 side of the fitting hole 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium-sized unit for in-mold foam molding used in foaming a large number of pre-expanded beads filled in a mold into an in-mold foam molded article by steam heating. The present invention relates to a mold for foam molding.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, a conventional mold 51 for in-mold foam molding of this kind includes a mold frame 3, a back plate 5, a middle plate 7, a support 52, and a middle mold 12. It is used in a state mounted on an in-mold foam molding machine (not shown) as a pair with another in-mold foam molding die 2 provided with the like, and has openings 3a and 3b at the front and rear, respectively. A cylindrical mold frame 3 and a plurality of insertion holes 53 fixed so as to close the opening 3b on the rear side of the mold frame 3 for inserting the feeder 14 or the eject pin 15 of the in-mold foam molding machine. , A middle plate 7 fixed to close the opening 3 a on the front side of the mold frame 3 and having a plurality of mounting holes 6, interposed between the back plate 5 and the middle plate 7. Support 52 and flange 1 protruding from the edge
3 is provided around the outer space 11 side of the mounting hole 6 and includes a middle mold 12 having a plurality of mounting holes 18 for mounting the tip of the feeder 14 or the tip of the eject pin 15 inserted through the insertion hole 53; One in which a steam chamber 8 is formed is known.

Here, when the middle mold 12 is replaced with another middle mold 12 due to a change in production of a desired in-mold foam molded article,
The position of the mounting hole 18 of the other middle die 12 is the insertion hole 53 of the back plate 5.
In many cases, the feeder 14 and the eject pin 15 cannot be mounted in the mounting holes 18 of the other middle dies 12 as they are, so it is necessary to replace the back plate 5 together with the middle dies 12. In the replacement work of the middle mold 12 and the back plate 5, as shown in FIG. 6, first, the mold frame 3 to which the middle plate 7 to which the middle mold 12 is fixed and the back plate 5 are attached is moved from the in-mold foam molding machine. Removed. After that, the other middle plate 12 is replaced with another middle plate 7 previously fixed and the other back plate 5.

[0005] As shown in FIG.
In the in-mold foam molding die 61 in which the back plate 5 can be removed to the steam chamber 8 side (front side) from the flange 23 protruding into the opening 3b on the rear side, the middle die is used for the same reason as described above. The back plate 5 needs to be replaced together with the back plate 12. This medium 12
In the replacement operation of the back plate 5 and the middle plate 7 to which the middle mold 12 is fixed, and the back plate 5 are removed from the mold frame 3 together with the unit 62 in a state of being integrated via a plurality of supports 52. After that, the unit 62 with the other middle plate 7 to which the other middle mold 12 is fixed and the other back plate 5 are attached in advance.
Has been replaced.

[0005]

As described above, the medium-sized 1
Since the replacement work of 2 etc. is extremely complicated, there is a problem that the productivity of the in-mold foam molded product cannot be improved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a middle mold unit for in-mold foam molding and a mold for in-mold foam molding which can easily replace a middle mold. Aim.

[0007]

In order to achieve the above object, an in-mold foam molding medium-size unit according to claim 1 is formed in a flat plate shape and is provided with a plurality of in-mold foam molding machine feeders or eject pins. Medium-sized back plate having a through-hole formed therein, a plurality of medium-sized supports erected at right angles to one surface side of the middle-sized back plate, and a feeder fixed to the tips of these medium-sized supports and inserted through the insertion holes. And a medium size having a plurality of mounting holes for mounting the tip of the eject pin or the tip of the eject pin.

According to a second aspect of the present invention, there is provided a middle-sized unit for foam molding in a mold, wherein a sealing packing is provided around the other surface of the back plate for the middle size.

According to a third aspect of the present invention, there is provided an in-mold foaming mold having a cylindrical mold frame having front and rear openings, and being fixed so as to close an opening on the rear side of the mold frame. A back plate having at least one through hole for inserting a feeder and an eject pin of the foam molding machine, and at least one mounting hole fixed to close a front opening of the mold frame. With a middle plate,
An in-mold foam molding die having a steam chamber formed therein, wherein the other side of the middle-sized back plate of the mid-size unit for in-mold foam molding according to claim 1 or 2 is on the steam chamber side of the through hole. The in-mold foam molding medium unit is inserted into the steam chamber from the external space through the mounting hole so as to be in close contact with the periphery, and the flange protruding from the middle edge of the in-mold foam molding medium unit is fitted with the flange. It is detachably mounted around the outer space side of the mounting hole.

According to a fourth aspect of the present invention, there is provided a mold for in-mold foam molding, wherein a positioning recess for fitting with the flange is provided around an outer space side of the mounting hole.

According to a fifth aspect of the present invention, there is provided a mold for in-mold foam molding, wherein a positioning recess for fitting with the middle-sized back plate is provided around the through hole on the steam chamber side.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In addition, about the same structure as a prior art, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 1 and 2, an in-mold foam molding die 1 according to this embodiment is paired with another in-mold foam molding die 2 as an in-mold foam molding machine (not shown). ), Which is used in a state where the mold frame 3 and
A back plate 5 having a through hole 4 and a middle plate 7 having a mounting hole 6 are provided. A steam chamber 8 is formed inside the back plate 5.

In the in-mold foam molding die 1, the other side 10 b of the middle back plate 10 of the middle unit 9 for in-mold foam molding is closely attached to the periphery of the through hole 4 on the steam chamber 8 side. The in-mold foam molding medium-size unit 9 is inserted into the steam chamber 8 from the external space 11 through the mounting hole 6, and the flange 13 protruding from the edge of the middle mold 12 of the in-mold foam molding medium-size unit 9 is attached. It is detachably attached around the outer space 11 side of the attachment hole 6.

The mold frame 3 is formed in a tubular shape having openings 3a and 3b at the front and rear, respectively, and is mounted on a predetermined portion of the in-mold foam molding machine. The steam chamber 8 includes an inner space surrounded by the mold frame 3, the back plate 5, and the middle plate 7. In addition, a steam valve (not shown), a drain valve (not shown), and the like that communicate with the steam chamber 8 are connected to the mold frame 3.

The back plate 5 is fixed with bolts or the like so as to close the opening 3b on the rear side of the mold frame 3. The back plate 5 collectively integrates the feeder 14 and the eject pin 15 of the in-mold foam molding machine with an interval therebetween. A through-hole 4 is formed for opening and inserting a through hole. The number and shape of the through holes 4 are not particularly limited, and at least one through hole 4
May be formed at a predetermined position. However, in order to correspond to various middle mold units 9 for in-mold foam molding, that is, it is possible to correspond to a change in a mounting position of the feeder 14 and the eject pin 15,
It is desirable to form it large.

The middle plate 7 is fixed with bolts or the like so as to close the opening 3a on the front side of the mold frame 3, and has a mounting hole 6 for inserting the middle mold unit 9 for in-mold foam molding. Is formed. The number and shape of the mounting holes 6 are not particularly limited, either.
The mounting position, shape,
What is necessary is just to form according to a size etc.

The middle mold unit 9 for in-mold foam molding includes a middle back plate 10 having a plurality of insertion holes 16, a middle support 17, and a middle mold 12 having a plurality of mounting holes 18.
And

The middle-sized back plate 10 is formed in a flat plate shape larger than the through hole 4 of the back plate 5, and has a plurality of insertion holes 16 through which the feeder 14 or the eject pins 15 are inserted.

The middle-sized support 17 is formed, for example, in a rod shape, and is erected by, for example, bolts or the like on the one surface side 10a of the middle-sized back plate 10, for example, at right angles and with an interval therebetween. In addition, the configuration, number,
The standing position and the like are not particularly limited and can be changed as appropriate.

The middle mold 12 is formed, for example, in a concave shape, and the middle mold support 17 is formed with the molding surface side 12a facing forward.
Is fixed to the tip of the device with bolts or the like. At the position corresponding to the insertion hole 16 of the middle die 12, a plurality of mounting holes 18 for mounting the tip of the feeder 14 or the tip of the eject pin 15 inserted into the insertion hole 16 are formed. That is, the insertion hole 16 and the mounting hole 18 are formed such that the center lines thereof coincide with each other, and these center lines are perpendicular to the plane directions of the back plate 5 and the middle-sized back plate 10. I have. Further, a flange 13 protrudes from an edge of the middle die 12. The shape of the middle mold 12 is not particularly limited, and the middle mold 12 of the other in-mold foam molding die 2 has a concave shape or the like, and the middle mold 12 of the in-mold foam molding die 1 has a convex shape or the like. It may be formed.

In order to removably attach the in-mold foam molding medium unit 9 configured as described above to the in-mold foam molding die 1, the in-mold foam molding medium unit 9 is moved from the external space 11 to the inside. The other side 10 b of the medium-sized back plate 10 is inserted into the steam chamber 8 through the mounting hole 6 of the
To the periphery of the steam chamber 8 side of the
3 may be fixed around the mounting hole 6 of the middle plate 7 on the outer space 11 side with bolts or the like.

In order to replace the middle mold 12, after removing the middle mold unit 9 for in-mold foam molding from the mold 1 for in-mold foam molding, the other middle mold 12 and the other middle mold back plate 10 are connected to a plurality of other middle molds. What is necessary is just to attach another medium-size unit 9 for foam molding in the mold previously integrated with the medium-size support 17. In this way, it is only necessary to remove the in-mold foam molding middle unit 9 and replace it with another in-mold foam molding middle unit 9 without removing the mold frame 3, the back plate 5, and the middle plate 7.
There is an advantage that the replacement work of the middle mold 12 can be easily performed.
In the case where a plurality of the in-mold foam molding intermediate units 9 are attached to the in-mold foam molding die 1 as in this embodiment, the exchangeable in-mold foam molding intermediate unit 9 can be selected. . Therefore, it is possible to cope with the small-scale production of the in-mold foam molded article.

If a seal packing 19 is provided around the other side 10b of the middle-sized back plate 10 as in this embodiment, the gas is supplied from the steam valve into the steam chamber 8 during foam molding. There is an advantage that the water vapor is hardly leaked from the through hole 4 of the back plate 5. Note that the seal packing 19 may be fitted into a groove 20 formed around the other surface 10b of the middle-sized back plate 10 or the like.

If a positioning recess 21 for fitting with the flange 13 of the middle mold 12 is provided around the outer space 11 side of the mounting hole 6 of the middle plate 7, the middle mold unit 9 for in-mold foam molding is mounted. Since the positioning is simple, there is an advantage that the mounting operation can be performed more efficiently. Further, as shown in FIG. 3, positioning recesses 22 for fitting with the medium-sized back plate 10 are provided around the through holes 4 of the back plate 5 on the steam chamber 8 side.
It is more effective to provide In addition, medium size 12
If the shape, size, and the like of the flange 13 and the back plate 10 for the middle size are rated, various middle-size units 9 for foam molding in the mold can be used.
It is possible to correspond to. In this case, it is desirable that the mounting hole 6 of the middle plate 7 be formed large.

In addition, the mold 1 for in-mold foam molding is not limited to this embodiment. As shown in FIG. 4, the back plate 5 is connected to an opening on the rear side of the mold frame 3. 3b, the steam chamber 8 is fixed to the flange 23 protruding from the steam chamber 8b.
It may be a mold 31 for in-mold foam molding that can be removed to the side (front side). Further, the direction of clamping and opening of the mold 1 for in-mold foam molding and the other mold 2 for foam molding in another mold is not particularly limited, and a horizontal direction, a vertical direction, or an oblique direction is possible. It is.

[0027]

As described above, according to the first and third aspects of the present invention, the middle mold unit for foam molding in the mold can be removed without removing the mold frame, the back plate, and the middle plate. It only needs to be replaced with a medium-sized unit for inner foam molding,
Easy replacement of medium size.

According to the second aspect of the present invention, since the seal packing is provided around the other side of the middle-sized back plate, the steam supplied from the steam valve into the steam chamber during the foam molding is used for the back plate. Hardly leaks from the through hole.

According to the fourth aspect of the present invention, since the positioning recess for fitting with the middle flange is provided around the outer space side of the mounting hole of the middle plate, the middle mold unit for in-mold foam molding is mounted. Positioning is easy, and the mounting work can be performed more efficiently.

According to the fifth aspect of the present invention, the positioning recess for fitting with the middle-size back plate is provided around the steam chamber side of the through hole of the back plate. The work of mounting the medium-size unit for inner foam molding can be performed more efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a state where a mold for in-mold foam molding according to an embodiment and another mold for in-mold foam molding are clamped.

FIG. 2 is a schematic cross-sectional view showing a state in which a middle mold unit for in-mold foam molding is removed from a mold for in-mold foam molding.

FIG. 3 is a schematic cross-sectional view showing an example in which a positioning recess is also provided around a steam chamber side of a through hole of a back plate.

FIG. 4 is a schematic sectional view showing another example of a mold for in-mold foam molding.

FIG. 5 is a schematic sectional view showing a conventional example.

FIG. 6 is a schematic cross-sectional view showing a state in which a middle plate to which a middle mold is fixed is removed from a mold frame, and a mold frame to which a back plate is fixed is removed from an in-mold foam molding machine.

FIG. 7 is a schematic sectional view showing another conventional example.

[Explanation of symbols]

 1, 31 Mold for in-mold foam molding 3 Mold frame 3a, 3b Opening 4 Through hole 5 Back plate 6 Mounting hole 7 Middle plate 8 Steam chamber 9 Medium unit for in-mold foam molding 10 Medium back plate 10a One side 10b Other surface side 11 External space 12 Medium size 13 Flange 14 Feeder 15 Eject pin 16 Insertion hole 17 Medium size support 18 Mounting hole 19 Seal packing 21,22 Positioning recess

Claims (5)

[Claims] 1. A medium-sized back plate formed in a flat plate shape and formed with a plurality of insertion holes for inserting a feeder or an eject pin of an in-mold foam molding machine, and an upright perpendicular to one surface side of the medium-sized back plate. A plurality of medium-sized supports provided, and a medium-sized die fixed to the tips of these medium-sized supports and formed with a plurality of mounting holes for mounting the tip of a feeder or the tip of an eject pin inserted through the insertion hole. A medium-sized unit for in-mold foam molding. 2. The middle mold unit for in-mold foam molding according to claim 1, wherein a seal packing is provided around the other surface of the middle mold back plate. 3. A cylindrical mold frame having front and rear openings, and a feeder and an eject pin of an in-mold foam molding machine fixed so as to close an opening on the rear side of the mold frame. A back plate having at least one through-hole formed therein, and a middle plate fixed so as to close an opening on the front side of the mold frame and having at least one mounting hole formed therein, and a steam chamber therein. 3. The formed mold for in-mold foam molding, wherein the other surface side of the middle-sized back plate of the medium-size unit for in-mold foam molding according to claim 1 or 2 is in close contact with the periphery of the through hole on the steam chamber side. In addition, the in-mold foam molding medium unit is inserted into the steam chamber from the external space through the mounting hole, and the flange protruding from the middle edge of the in-mold foam molding medium unit is attached to the outer space of the mounting hole. Wear around the side Mold foam molding mold, characterized in that mounted freely. 4. The in-mold foam molding die according to claim 3, wherein a positioning recess for fitting with the flange is provided around the outer space side of the mounting hole. 5. The mold for in-mold foam molding according to claim 3, wherein a positioning recess for fitting with the middle-sized back plate is provided around the steam chamber side of the through hole.